Extremely-water-repellent soil soaking characteristic curve tester

Abstract

The invention relates to the technical field of soil detection, and discloses an extremely-water-repellent soil soaking characteristic curve tester which comprises a test bed, a display instrument is arranged on the front side of the top of the test bed, a lower box body is arranged on the rear side of the display instrument, a clay test mechanism is arranged on the right side of the display instrument, and a sand test mechanism is arranged on the right side of the lower box body. An upper box body is slidably connected to the side, away from the test bed, of the lower box body, a mounting plate is slidably connected to the interior of the lower box body, a plurality of uniformly distributed moisture content sensors are arranged in the mounting plate, fixing assemblies are arranged on the front side and the rear side of the mounting plate, and each fixing assembly comprises a moving plate. Through the mounting plate, an experimenter can flexibly select and adjust the number of the moisture content sensors according to the test volume and type of the extremely-water-repellent soil sample, and the positions of the sensors can be accurately adjusted through the fixing assembly, so that the sensors can be accurately embedded into the extremely-water-repellent soil sample.

Description

Technical Field

[0001] The present invention relates to the technical field of soil detection, in particular to an extremely hydrophobic soil immersion characteristic curve tester. Background Art

[0002] Extremely hydrophobic soils generally refer to soil types with very poor water permeability, primarily including certain sandy soils and clays. Extremely hydrophobic soils are characterized by a pore structure that makes water difficult to enter and remains on the surface, especially under low head conditions. For clays, the small pores create a high resistance to water penetration, leading to uneven water distribution throughout the soil. Especially at low moisture contents, the soil's ability to absorb water virtually disappears. Therefore, studying and testing the water permeability characteristics of extremely hydrophobic soils is crucial for fields such as agriculture, environmental protection, and soil and water conservation.

[0003] The Extremely Hydrophobic Soil Soil Water Permeation Characteristic Curve Tester is a device used to test the water permeability characteristics of extremely hydrophobic soils under different water heads and the changes in their moisture content. This instrument can simulate different soil types, such as sand and clay, and use precise control of the changes in water head to test the water permeability of extremely hydrophobic soils under different water heads. That is, the change pattern of moisture content with water head during the permeability process. Its main purpose is to derive the soil's moisture retention curve by testing the permeability behavior of the soil under different water heads, providing experimental data for soil improvement, irrigation management, and related water conservancy projects. This equipment can be widely used in anti-seepage projects and soil and water conservation, and is particularly important for optimizing soil management and improving water resource utilization efficiency.

[0004] Existing instruments are only for hydrophilic soils, and there are no instruments for hydrophobic soils. The moisture content of hydrophobic soils will change with the water head, while that of hydrophilic soils will not. When the soil is saturated, the moisture content of hydrophilic soils remains unchanged. Therefore, the present invention proposes an extremely hydrophobic soil immersion characteristic curve tester to address the shortcomings of the existing technology. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention provides an extremely hydrophobic soil immersion characteristic curve tester, which solves the problem that the existing instruments are only for hydrophilic soils and there are no instruments for hydrophobic soils.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an extremely hydrophobic soil immersion characteristic curve tester, comprising a test bench, a display provided on the top front side of the test bench, a lower box provided on the rear side of the display, a clay testing mechanism provided on the right side of the display, and a sand testing mechanism provided on the right side of the lower box, an upper box slidably connected to a side of the lower box away from the test bench, a mounting plate slidably connected to the interior of the lower box, a plurality of evenly distributed moisture content sensors being provided inside the mounting plate, and fixing components being provided on both the front and rear sides of the mounting plate;

[0007] The fixing assembly includes a movable plate, which is slidably connected to the inside of the mounting plate, a dial plate is fixed to the side of the movable plate away from the mounting plate, a movable circular plate is fixed to the side of the movable plate close to the mounting plate, a spring is fixed to the side of the movable circular plate close to the mounting plate, and a clamping block is fixed to the side of the movable circular plate away from the spring, the inside of the movable circular plate is slidably connected to a round rod, and clamping grooves are provided on the left and right sides of the interior of the mounting plate, a supporting assembly is provided at the bottom of the lower box body, and mounting assemblies are provided on the front and back sides of the lower box body and the upper box body.

[0008] Preferably, the clay testing mechanism includes an air compressor, which is installed on the right side of the test bench. The top of the air compressor is connected to a pressure regulating valve through an air pipe, and the end of the pressure regulating valve away from the air compressor is connected to a pressure gauge through the air pipe. The end of the pressure gauge away from the pressure regulating valve is connected to a water tank through the air pipe, and the bottom of the water tank is connected to a regulating valve through a water supply pipe. A support rod is provided at the bottom of the water tank.

[0009] Preferably, the sand and soil testing mechanism includes a column, which is installed on the right side of the lower box body, a sliding rod is fixed inside the column, and an electric slider is slidably connected to the outer periphery of the sliding rod, and connecting rods are fixed on the left and right sides of the electric slider, and a support plate is fixed on the side of the connecting rod close to the lower box body, and the top of the support plate is installed on the bottom of the water tank, and water pumps are installed at the bottom of the two water tanks.

[0010] Preferably, the support assembly includes two electric push rods, which are installed on the top of the test bench on one side close to the lower box body. A connecting block is fixed on the top of the two electric push rods, and a connecting frame is fixed on the opposite side of the connecting block. The connecting frame is fixed to the outer periphery of the lower box body, and two telescopic rods are fixed on the left and right sides of the connecting frame, and two fixed rods are fixed on the right side of the upper box body.

[0011] Preferably, the installation assembly includes two assembly blocks 1 and two assembly blocks 2, the two assembly blocks 1 are respectively fixedly connected to the front and rear sides of the upper box body, and the two assembly blocks 2 are respectively fixedly connected to the front and rear sides of the assembly block 2, and the internal threads of the assembly block 1 and the assembly block 2 are connected with a butterfly screw.

[0012] Preferably, filter paper is installed inside the lower box body.

[0013] Preferably, a water outlet head is provided on the top of the water tank, and an end of the water outlet head away from the water tank is connected to a water storage pipe.

[0014] Preferably, a telescopic plate is fixed to a side of the movable plate close to the mounting plate, and a side of the telescopic plate away from the movable plate is fixed inside the mounting plate.

[0015] Preferably, the end of the regulating valve away from the water tank is installed on the right side of the upper box body through a water supply pipe, and a threaded exhaust port is provided on the top of the upper box body.

[0016] Preferably, the side of the support rod away from the water tank is fixed to the top of the test bench.

[0017] The present invention provides an extremely water-repellent soil immersion characteristic curve tester.

[0018] Beneficial effects:

[0019] 1. The present invention uses a mounting plate to allow experimenters to flexibly select and adjust the number of moisture content sensors based on the test volume and type of extremely hydrophobic soil samples. The fixed components allow the precise adjustment of the sensor positions, allowing the sensors to be accurately embedded in the extremely hydrophobic soil samples, ensuring that each sensor can measure at the appropriate depth and position. This solves the problem of traditional equipment where sensor positions cannot be flexibly adjusted to adapt to different experimental requirements, thereby improving the flexibility and accuracy of the experiment.

[0020] 2. The present invention ensures a tight and firm connection between the upper box body and the lower box body through the installation component, while the support component effectively prevents the lower box body from tilting or being unstable, and provides a stable supporting force, making the experimental equipment more stable during the entire test process, avoiding the shortcomings of traditional devices in connection or support, and ensuring the stability and accuracy of the experiment.

[0021] 3. By designing sand and clay test institutions separately, the experimental needs of different soils can be adapted. The sand test institution adjusts the water head by adjusting the position of the water tank. The raising and lowering of the water tank can accurately control the height of the water head, thereby simulating the water infiltration process in the sand. The clay test institution adjusts the water head by adjusting the air pressure. By providing additional air pressure, it promotes the entry of water into the tiny pores of the clay, ensuring that water can evenly penetrate into the extremely hydrophobic soil samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A perspective view of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the lower box body of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the mounting plate of the present invention;

[0025] Figure 4 Schematic diagram of the structure of the moisture content sensor of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the card block of the present invention;

[0027] Figure 6 It is a structural schematic diagram of the water storage tank of the present invention;

[0028] Figure 7 This is a schematic structural diagram of the electric slider of the present invention;

[0029] Figure 8 It is a structural schematic diagram of the air compressor of the present invention.

[0030] Among them, 1. Test bench; 2. Display; 3. Clay testing mechanism; 301. Air compressor; 302. Pressure regulating valve; 303. Pressure gauge; 4. Sand testing mechanism; 401. Column; 402. Slide rod; 403. Electric slider; 404. Connecting rod; 405. Support plate; 406. Water pump; 5. Lower box; 6. Upper box; 7. Mounting plate; 8. Support assembly; 801. Electric push rod; 802. Connecting block; 803. Connecting frame; 804. Telescopic rod; 805. Fixed rod; 9. Fixed assembly; 901, dial plate; 902, movable plate; 903, telescopic plate; 904, clamping block; 905, movable circular plate; 906, round rod; 907, spring; 908, clamping slot; 10. Installation assembly; 1001, assembly block one; 1002, assembly block two; 1003, butterfly screw; 11, moisture content sensor; 12, filter paper; 13, support rod; 14, water supply pipeline; 15, regulating valve; 16, water storage tank; 17, water outlet head; 18, water storage pipeline; 19, threaded exhaust port. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the present specification. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] Please see the attached Figure 1 - Attachment Figure 2 The embodiment of the present invention provides an extremely hydrophobic soil immersion characteristic curve tester, including a test bench 1, which is used to install various test components. The test bench 1 is made of 304 stainless steel as a whole and has good corrosion resistance. A display 2 is provided on the top front side of the test bench 1. The display 2 is used to receive sensor data and display the characteristic curve. A lower box body 5 is provided on the back side of the display 2. A clay test mechanism 3 is provided on the right side of the display 2. A sand test mechanism 4 is provided on the right side of the lower box body 5. The side of the lower box body 5 away from the test bench 1 is slidably connected to an upper box body 6. The lower box body 5 and the upper box body 6 are both made of organic glass. The lower box body 5 is provided with a plurality of plexiglass frames. The body 5 is used to store extremely hydrophobic soil samples, while the upper box body 6 is used to inject water samples into the soil to conduct water immersion characteristic tests. The sand test mechanism 3 is mainly suitable for sand immersion tests, while the clay test mechanism 4 is mainly suitable for clay immersion tests. The interior of the lower box body 5 is slidably connected to a mounting plate 7, and a filter paper 12 is installed inside the lower box body 5. The interior of the mounting plate 7 is provided with multiple evenly distributed moisture sensors 11. The mounting plate 7 is used to mount multiple moisture sensors 11. The moisture sensors 11 are used to detect the moisture content of the extremely hydrophobic soil samples. Fixed components 9 are provided on the front and back sides of the mounting plate 7.

[0033] Please see the attached Figure 3 - Attachment Figure 5The fixing assembly 9 includes a moving plate 902, which is slidably connected to the inside of the mounting plate 7. A dial plate 901 is fixed to the side of the moving plate 902 away from the mounting plate 7. The moving plate 902 is connected to the dial plate 901, and the moving plate 902 is moved by moving the dial plate 901. A moving circular plate 905 is fixed to the side of the moving plate 902 close to the mounting plate 7. The moving plate 902 is connected to the moving circular plate 905, and when the moving plate 902 moves, the moving circular plate 905 can be driven to move together. A telescopic plate 903 is fixed to the side of the moving plate 902 close to the mounting plate 7, and the side of the telescopic plate 903 away from the moving plate 902 is fixed to the inside of the mounting plate 7. The telescopic plate 903 is used to prevent extremely water-repellent soil samples from falling into the mounting plate 7. A spring 907 is fixed to the side of the moving circular plate 905 close to the mounting plate 7, and the moving circular plate 905 is away from the spring 9 The spring 907 is used to provide a supporting force, and the spring 907 is sleeved on the outer circumference of the round rod 906 and one end is fixed to the inside of the mounting plate 7. When the round rod 906 of the movable circular plate 905 moves, the spring 907 exerts a force on the spring 907, and the block 904 is connected to the movable circular plate 905. When the movable circular plate 905 moves, the block 904 will move together with the block 904. The left and right sides of the interior of the mounting plate 7 are provided with a card slot 908, which is used to cooperate with the card slot 904. The card slot 908 is inserted into the card slot 908 to fix the mounting plate 7 in the lower box body 5. The bottom of the lower box body 5 is provided with a support assembly 8, and the front and rear sides of the lower box body 5 and the upper box body 6 are provided with mounting assemblies 10.

[0034] Please see the attached Figure 6 - Attachment Figure 7The clay testing mechanism 3 includes an air compressor 301, which is installed on the right side of the test bench 1. The top of the air compressor 301 is connected to a pressure regulating valve 302 through an air pipe. The air compressor 301 is a piston air compressor, model Ingersoll Rand T30, which is used to provide a higher air pressure, thereby increasing the water head and promoting water penetration into extremely hydrophobic soil samples. The pressure regulating valve 302 is connected to the air pipeline for regulating the gas pressure. The end of the pressure regulating valve 302 away from the air compressor 301 is connected to a pressure gauge 303 through an air pipe. The pressure gauge 303 is installed on the periphery of the air pipe for monitoring the pressure value in the air pipe. When the test personnel adjust the pressure in the air pipe through the pressure regulating valve 302, they need to observe the value of the pressure gauge 303 in real time to avoid excessive pressure or underpressure. The pressure gauge 303 is small, and one end away from the pressure regulating valve 302 is connected to the water tank 16 through an air pipe. The bottom of the water tank 16 is connected to the regulating valve 15 through a water pipe 14. A support rod 13 is provided at the bottom of the water tank 16. The side of the support rod 13 away from the water tank 16 is fixed to the top of the test bench 1. The water tank 16 is used to store test water, and the water pipe 14 is used to transport the test water in the water tank 16 to the upper box body 6. The test personnel can control the flow rate of the test water by adjusting the valve 15.

[0035] Please see the attached Figure 8The sand and soil testing mechanism 4 includes a column 401, which is installed on the right side of the lower box body 5, and a sliding rod 402 is fixed inside the column 401. The outer periphery of the sliding rod 402 is slidably connected to an electric slider 403. The column 401 is used to install the sliding rod 402, and the electric slider 403 is used in conjunction with the sliding rod 402. After starting, the electric slider 403 will move vertically along the sliding rod 402. Connecting rods 404 are fixed on the left and right sides of the electric slider 403. A support plate 405 is fixed on the side of the connecting rod 404 close to the lower box body 5. The top of the support plate 405 is installed at the bottom of the water tank 16. The connecting rod 404 is used to connect the support plate 405 and the electric slider 403. When the electric slider 403 moves vertically along the sliding rod 402, the connecting rod 404 will move with the electric slider 403, so that the support plate 405 will move with the connecting rod The connecting rod 404 moves together, thereby driving the water tank 16 to move. A water pump 406 is installed at the bottom of the two water tanks 16. The clay testing mechanism 3 and the sand testing mechanism 4 are both equipped with two water tanks 16. A water pump 406 is installed at the bottom of the two water tanks 16 for extracting the stored water in the water tank 16. A water outlet head 17 is provided on the top of the water tank 16. The end of the water outlet head 17 away from the water tank 16 is connected to a water storage pipe 18. The water outlet head 17 is used to inject test water into the water tank 16 of the sand testing mechanism 4. The water storage pipe 18 is connected to the domestic water supply pipe to supply water to the test. The end of the regulating valve 15 away from the water tank 16 is installed on the right side of the upper box body 6 through the water supply pipe 14. The top of the upper box body 6 is provided with a threaded exhaust port 19. The threaded exhaust port 19 is used to discharge the gas in the upper box body 6.

[0036] Please see the attached Figure 2 The support assembly 8 includes two electric push rods 801, which are installed on the top of the test bench 1 near the lower box body 5. The electric push rods 801 are used to provide power to control the movement of the lower box body 5. The electric push rods 801 are model La12. The tops of the two electric push rods 801 are fixed with connecting blocks 802. The connecting blocks 802 are fixed with connecting frames 803 on the opposite sides. The connecting frames 803 are fixed on the outer periphery of the lower box body 5. The connecting frames 803 are installed on the lower box body 5 and connected, and are connected through the connecting blocks 80 2 is connected to the electric push rod 801 and the connecting frame 803. After the electric push rod 801 is started, the connecting frame 803 can be driven to move through the connecting block 802, thereby driving the lower box body 5 to move. Two telescopic rods 804 are fixed on the left and right sides of the connecting frame 803. The telescopic rods 804 are made of alloy steel and are used to ensure that the lower box body 5 maintains vertical movement. Two fixing rods 805 are fixed on the right side of the upper box body 6. The fixing rods 805 are used to connect the upper box body 6 so that the upper box body 6 is firmly installed on the top of the test bench 1.

[0037] Please see the attached Figure 2The mounting assembly 10 includes two assembly blocks 1001 and two assembly blocks 1002. The two assembly blocks 1001 are fixedly connected to the front and rear sides of the upper box body 6, and the two assembly blocks 1002 are fixedly connected to the front and rear sides of the assembly block 1002. The internal threads of the assembly blocks 1001 and 1002 are connected with butterfly screws 1003. The assembly block 1001 is used in conjunction with the assembly block 1002. The butterfly screws 1003 can make the assembly block 1001 and the assembly block 2 1002 abut against each other, so that the lower box body 5 and the upper box body 6 are connected to each other, and the immersion test can be carried out.

[0038] Working principle: When conducting extremely hydrophobic soil moisture content detection, first start the electric push rod 801, so that the electric push rod 801 drives the lower box body 5 to move downward, so that the lower box body 5 is separated from the upper box body 6, and then the sand is tested first, and the filter paper 12 is laid on the inner bottom side of the lower box body 5. Then, the corresponding number of moisture content sensors 11 are installed according to the capacity of the sand. The tester uses both hands to respectively move the two dial plates 901. When the dial plate 901 moves, the movable plate 902 at the bottom of the dial plate 901 moves together, thereby driving the telescopic plate 903 to move. Because the telescopic plate 903 is connected to the card block 904, when the telescopic plate 903 is driven by the movable plate 902 to move, it will drive the movable circular plate 905 to move along the round rod 906. When the telescopic plate 903 moves along the round rod 906, it will press the spring 907 applies a force, thereby causing the spring 907 to contract. After the block 904 slides out of the slot 908 provided inside the mounting plate 7, the mounting plate 7 can be taken out from the lower box body 5. Then, a corresponding number of moisture sensors 11 are installed in the mounting plate 7. Then, the dial plate 901 is dialed again to place the mounting plate 7 into the lower box body 5. According to the amount of test soil and the test content, the mounting plate 7 is installed in the corresponding position. After the block 904 is aligned with the slot 908, the dial plate 901 can be released. As a result, the spring 907 loses the squeeze of the movable circular plate 905, thereby generating a reset movement. Then, the spring 907 applies a force to the movable circular plate 905, causing the movable circular plate 905 to drive the block 904 to move together, causing the block 904 to slide into the slot 908, thereby completing the installation.

[0039] After the mounting plate 7 is installed in the lower box body 5, sandy soil can be sprinkled into the lower box body 5 from the gap between the lower box body 5 and the mounting plate 7. After the sand fills the lower box body 5, the filter paper 12 can be laid on the top of the lower box body 5. Then, the electric push rod 801 is started again. The electric push rod 801 controls the lower box body 5 to move upward so that the lower box body 5 contacts the upper box body 6. After the top of the lower box body 5 contacts the bottom of the upper box body 6, the butterfly screw 1003 can be screwed into the assembly block 1 1001 and the assembly block 2 1002 and fixed with the corresponding nuts.

[0040] After the lower box body 5 and the upper box body 6 are connected to each other, the top valve of the water outlet head 17 is rotated to allow the test water to enter the water tank 16 on the top of the support plate 405, and then the water supply pipe 14 is connected to the upper box body 6, and then the water pump 406 at the bottom of the water tank 16 is started, and the water pump 406 extracts the test water in the water tank 16, and at the same time, the threaded exhaust port 19 is rotated to discharge the air in the upper box body 6, and then the water flow is adjusted by adjusting the valve 15. After the test water enters the upper box body 6 through the water supply pipe 14, the sand immersion test can be carried out. When the test water is transported to the upper box body 6, the electric slider 403 can be started to move along the slide rod 402, so that the support plate 405 drives the water tank 16 to move. By adjusting the position of the water tank 16, different water flow infiltration processes can be simulated;

[0041] When conducting a clay test, the steps are the same as those for a sand test. After the lower box body 5 is connected to the upper box body 6, test water is injected into the water tank 16 at one end of the pressure gauge 303. Then, the water pipe 14 at one end of the regulating valve 15 is connected to the upper box body 6. The test water in the water tank 16 is then extracted by the water pump 406. The water flow rate is adjusted by adjusting the valve 15. When the test water enters the upper box body 6, the air compressor 301 is started, and sufficient air pressure is provided to the water pipe 14 by adjusting the pressure regulating valve 302 and observing the pressure gauge 303, thereby increasing the water head to promote water penetration into the small pores in the clay, thereby conducting a clay immersion test.

[0042] After the test is completed, the lower box body 5 and the upper box body 6 are separated, and the lower box body 5 and the moisture content sensor 11 are cleaned so as to carry out the next test.

[0043] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An extremely water-repellent soil immersion characteristic curve tester, comprising a test bench (1), characterized in that: A display instrument (2) is provided on the front side of the top of the test bench (1), a lower box body (5) is provided on the rear side of the display instrument (2), a clay test mechanism (3) is provided on the right side of the display instrument (2), a sand test mechanism (4) is provided on the right side of the lower box body (5), an upper box body (6) is slidably connected to the side of the lower box body (5) away from the test bench (1), a mounting plate (7) is slidably connected inside the lower box body (5), a plurality of evenly distributed moisture content sensors (11) are provided inside the mounting plate (7), and fixing components (9) are provided on both the front and rear sides of the mounting plate (7); The fixing assembly (9) comprises a moving plate (902), the moving plate (902) being slidably connected to the inside of the mounting plate (7), a shifting plate (901) being fixed to the side of the moving plate (902) away from the mounting plate (7), a moving circular plate (905) being fixed to the side of the moving plate (902) close to the mounting plate (7), a spring (907) being fixed to the side of the moving circular plate (905) close to the mounting plate (7), a clamping block (904) being fixed to the side of the moving circular plate (905) away from the spring (907), a round rod (906) being slidably connected to the inside of the moving circular plate (905), clamping grooves (908) being provided on both left and right sides of the inside of the mounting plate (7), a supporting assembly (8) being provided at the bottom of the lower box body (5), and mounting assemblies (10) being provided on both the front and rear sides of the lower box body (5) and the upper box body (6).

2. The extremely water-repellent soil immersion characteristic curve tester according to claim 1, characterized in that: The clay test mechanism (3) comprises an air compressor (301), the air compressor (301) being installed on the right side of the test bench (1), the top of the air compressor (301) being connected to a pressure regulating valve (302) via an air pipe, the end of the pressure regulating valve (302) away from the air compressor (301) being connected to a pressure gauge (303) via the air pipe, the end of the pressure gauge (303) away from the pressure regulating valve (302) being connected to a water tank (16) via an air pipe, the bottom of the water tank (16) being connected to a regulating valve (15) via a water delivery pipeline (14), and a support rod (13) being provided at the bottom of the water tank (16).

3. The extremely water-repellent soil immersion characteristic curve tester according to claim 2, characterized in that: The sand and soil testing mechanism (4) comprises a column (401), wherein the column (401) is mounted on the right side of the lower box body (5), a sliding rod (402) is fixed inside the column (401), an electric slider (403) is slidably connected to the outer periphery of the sliding rod (402), connecting rods (404) are fixed on both the left and right sides of the electric slider (403), a support plate (405) is fixed on the side of the connecting rod (404) close to the lower box body (5), the top of the support plate (405) is mounted on the bottom of the water tank (16), and a water pump (406) is installed at the bottom of the two water tanks (16).

4. The extremely water-repellent soil immersion characteristic curve tester according to claim 1, characterized in that: The support assembly (8) comprises two electric push rods (801), the two electric push rods (801) are mounted on the top of one side of the test bench (1) close to the lower box body (5), the tops of the two electric push rods (801) are fixed with connecting blocks (802), the connecting blocks (802) are fixed with connecting frames (803) on the opposite sides, the connecting frames (803) are fixed to the outer periphery of the lower box body (5), the left and right sides of the connecting frames (803) are fixed with two telescopic rods (804), and the right side of the upper box body (6) is fixed with two fixing rods (805).

5. The extremely water-repellent soil immersion characteristic curve tester according to claim 1, characterized in that: The installation assembly (10) comprises two assembly blocks (1001) and two assembly blocks (1002), wherein the two assembly blocks (1001) are respectively fixedly connected to the front and rear sides of the upper box body (6), and the two assembly blocks (1002) are respectively fixedly connected to the front and rear sides of the assembly block (1002), and the internal threads of the assembly blocks (1001) and the assembly blocks (1002) are connected with butterfly screws (1003).

6. The extremely water-repellent soil immersion characteristic curve tester according to claim 1, characterized in that: Filter paper (12) is installed inside the lower box body (5).

7. The extremely water-repellent soil immersion characteristic curve tester according to claim 3, characterized in that: A water outlet head (17) is provided on the top of the water storage tank (16), and one end of the water outlet head (17) away from the water storage tank (16) is connected to a water storage pipe (18).

8. The extremely water-repellent soil immersion characteristic curve tester according to claim 1, characterized in that: A telescopic plate (903) is fixed to a side of the movable plate (902) close to the mounting plate (7), and a side of the telescopic plate (903) away from the movable plate (902) is fixed inside the mounting plate (7).

9. The extremely water-repellent soil immersion characteristic curve tester according to claim 3, characterized in that: One end of the regulating valve (15) away from the water storage tank (16) is installed on the right side of the upper box body (6) through a water delivery pipe (14), and a threaded exhaust port (19) is provided on the top of the upper box body (6).

10. The extremely water-repellent soil immersion characteristic curve tester according to claim 3, characterized in that: The side of the support rod (13) away from the water tank (16) is fixed to the top of the test bench (1).

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