Extremely-water-repellent soil critical water head tester

Abstract

The invention relates to the technical field of soil detection, and discloses an extreme water repellent soil critical water head tester which comprises a test box, supporting frames are installed on the left side and the right side of the bottom of the test box, and a bottom plate is installed on the sides, away from the test box, of the supporting frames. A sand testing mechanism and a clay testing mechanism are arranged at the top of the end, away from the testing box, of the bottom plate, a detection mechanism is arranged in the testing box, fixing mechanisms are arranged on the front side and the rear side of the top of the testing box, and the detection mechanism comprises a mounting plate; the mounting plate is mounted on the side, close to the supporting frame, of the test box, and a concentration pipe is mounted on the side, away from the test box, of the mounting plate. And through the shunting design in the detection mechanism, the test water is uniformly distributed in the test box, and a water stop plate is matched to effectively prevent the side wall streaming phenomenon, so that the test accuracy is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of soil detection, in particular to an extremely hydrophobic soil critical water head tester. Background Art

[0002] Extremely hydrophobic soil is a special type of soil that is difficult for water to penetrate due to the surface being covered with hydrophobic substances. It is mainly formed in areas with heavy vegetation coverage or affected by high temperatures. This type of soil exhibits extremely high water resistance in the early stages of water absorption, and water will only penetrate into the soil when the surface water head reaches a certain value. Extremely hydrophobic soil is widely found in areas after forest fires, sandy soils in arid environments, and agricultural soils rich in organic matter. It has a significant impact on the distribution and utilization efficiency of water, and directly affects the effects of agricultural irrigation, ecological restoration, and soil and water conservation.

[0003] In the existing technology, the critical water head of extremely hydrophobic soil is usually determined by water injection method, which applies water head to the top of the soil sample and observes the water infiltration behavior to determine the critical water head value. This type of method has been well applied to loose hydrophobic sand experiments, but for dense hydrophobic clay, the test difficulty is significantly increased due to its low permeability and strong hydrophobicity. In addition, the existing methods mostly rely on manual control of water injection volume and observation of water penetration status, which are easily affected by external factors. The stability and repeatability of the measurement results still need to be improved;

[0004] In the prior art, since the distribution uniformity of the water injection system is difficult to control, the water flow is mostly concentrated in a certain part of the soil sample, especially in dense soil tests, which easily leads to side wall flow and affects the accuracy of the experiment.

[0005] To this end, the present invention provides an extremely hydrophobic soil critical water head tester to solve the deficiencies of the prior art. Summary of the invention

[0006] In view of the deficiencies of the prior art, the present invention provides an extremely hydrophobic soil critical water head tester, which solves the problem in the prior art that the water injection system injects test water into the test box and the test water is unevenly distributed, thus affecting the test accuracy.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: an extremely hydrophobic soil critical water head tester, comprising a test box, support frames are installed on both the left and right sides of the bottom of the test box, a bottom plate is installed on the side of the support frame away from the test box, a sand test mechanism and a clay test mechanism are respectively arranged on the top of one end of the bottom plate away from the test box, a detection mechanism is arranged inside the test box, and a fixing mechanism is arranged on both the front and rear sides of the top of the test box;

[0008] The detection mechanism includes a mounting plate, which is mounted on a side of the test box close to the support frame, a concentrating pipe is mounted on a side of the mounting plate away from the test box, a plurality of shunt pipes are connected to the concentrating pipe on a side close to the test box through a pipeline, a plurality of shunt pipes are provided with a water stop plate on the outer periphery of a side close to the test box, a plurality of intersecting partitions are mounted inside the test box, a top plate is slidably mounted on the top of the test box, filter paper is arranged between the top plate and the test box, a sensor is arranged on a side of the test box away from the sand test mechanism and the clay test mechanism, and mounting mechanisms are arranged on both the front and rear sides of the mounting plate.

[0009] Preferably, the two fixing mechanisms each include a fixed handle, and the two fixed handles are respectively installed on the front and rear sides of the test box, a pull rod is slidably connected inside the side of the fixed handle close to the top plate, a pull plate is fixed to the end of the pull rod away from the fixed handle, a block is fixed to the side of the pull rod close to the test box, and a reset assembly is provided on the periphery of the pull rod.

[0010] Preferably, the sand and soil testing mechanism includes a water tank, which is installed on a side of the base plate away from the test box, a water pump and a water inlet pipe are respectively fixed to the side of the water tank away from the base plate, a water supply pipe 1 is installed on the side of the water pump away from the water tank, a control valve is installed on one end of the water supply pipe 1 away from the water pump, and a water supply pipe 2 is installed on one end of the control valve away from the water supply pipe 1, and a fixing rod is provided on the rear side of the water tank.

[0011] Preferably, the clay testing mechanism comprises two support rods, the two support rods slide on the top of the side of the base plate away from the test box, a fixing ring is fixed on the top of the two support rods, a water injection piston is fixed on the side of the fixing ring away from the base plate, a rotating handle is rotatable on the end of the water injection piston away from the base plate, a moving block is fixed on the opposite side of the two support rods, the internal thread of the moving block is connected with a fixing bolt, a sliding rod is slid inside the moving block, and a pressure gauge is installed on the side of the water injection piston close to the base plate.

[0012] Preferably, the mounting mechanism includes a side abutment plate, which is slidably connected to a side of the mounting plate away from the test box, a connecting rod is fixed to the side of the side abutment plate away from the mounting plate, a protective shell is provided on the periphery of the connecting rod, an electric push rod is provided on the side of the protective shell close to the bottom plate, two trapezoidal blocks are provided inside the protective shell, one of the trapezoidal blocks is fixed to an end of the connecting rod away from the side abutment plate, the other trapezoidal block is fixed to the top of the electric push rod, the other trapezoidal block is fixed to L-shaped blocks on both sides, a bottom abutment plate is fixed to the side of the L-shaped block close to the test box, and mating components are provided on the opposite sides of the two trapezoidal blocks.

[0013] Preferably, the reset assembly comprises a reset plate, the reset plate is fixed to the outer periphery of the pull rod, and a reset spring is fixed to a side of the reset plate away from the clamping block.

[0014] Preferably, one end of the second water delivery pipeline away from the control valve is fixed to a side of the central pipe away from the test box.

[0015] Preferably, the interlocking component comprises a slider, which fixes the top of another trapezoidal block, wherein a slide groove is provided inside one of the trapezoidal blocks, and the slider is slidably connected inside the slide groove.

[0016] Preferably, the reset spring is sleeved on the outer circumference of the pull rod, and one end of the reset spring away from the reset plate is fixed inside the fixed handle.

[0017] Preferably, the side of the bottom abutment plate away from the bottom plate is slidably connected to the side of the test box close to the bottom plate, and the L-shaped block is slidably connected to the inside of the protective shell.

[0018] The present invention provides an extremely water-repellent soil critical water head tester, which has the following beneficial effects:

[0019] 1. The present invention realizes uniform distribution of test water inside the test box through the diversion design in the detection mechanism, and cooperates with the water stop plate to effectively prevent the side wall flow phenomenon, thereby ensuring the accuracy of the experiment. In addition, the detection mechanism can also monitor the wetting range and wetting speed of the soil sample in real time, and transmit the data to the computer for analysis, thereby improving the scientific nature and visualization effect of the detection. The close connection between the test box and the detection mechanism through the installation mechanism greatly improves the stability of the device, and simplifies the installation process, effectively avoiding the experimental data error problem caused by poor sealing or loose connection in traditional experiments, and ensuring the reliability of the test results.

[0020] 2. The present invention realizes the stable installation of the top plate on the top of the test box through the fixing mechanism. The top plate can remain stable under high head pressure through the snap-on fixing structure to prevent the top plate from shifting or the soil sample from being washed away by the water flow during the test. In addition, the resetting operation of the snap is automatically completed through the resetting component, making the operation of the entire experimental device more convenient and reducing the possibility of human error. It not only enhances the pressure resistance of the device, but also improves the repeatability and reliability of the experiment.

[0021] 3. The present invention provides a special test method for different soil characteristics through the split design of the sand test mechanism and the clay test mechanism. The sand test mechanism adopts a water pump and a flow rate control structure, which can achieve accurate water injection under low water head conditions and meet the experimental requirements of low permeability resistance of sand; while the clay test mechanism uses a piston structure with gradually increasing water head to accurately control the water infiltration rate, which is more suitable for the characteristics of high permeability resistance of clay. The two test mechanisms are integrated in the same device, and the use range of the equipment is effectively expanded through flexible switching, which solves the problem of poor adaptability of traditional equipment to different soil types, while improving the experimental accuracy and efficiency, and significantly enhancing the scientificity and reliability of the test. 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 support frame of the present invention;

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

[0025] Figure 4 It is a structural schematic diagram of a water delivery pipeline 1 of the present invention;

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

[0027] Figure 6 It is a schematic diagram of the structure of the partition of the present invention;

[0028] Figure 7 It is a schematic diagram of the structure of the protective shell of the present invention;

[0029] Figure 8 It is a structural schematic diagram of the bottom abutment plate of the present invention;

[0030] Fig. 9 It is a structural schematic diagram of the slider of the present invention;

[0031] Fig.10 It is a structural schematic diagram of the card block of the present invention.

[0032] Among them, 1. test box; 2. sand test mechanism; 201. water tank; 202. water inlet pipe; 203. water pump; 204. water pipeline 1; 205. control valve; 206. water pipeline 2; 207. fixing rod; 3. clay test mechanism; 301. water injection piston; 302. rotating handle; 303. fixing ring; 304. support rod; 305. moving block; 306. fixing bolt; 307. sliding rod; 308. pressure gauge; 4. bottom plate; 5. fixing mechanism; 501. fixing handle; 502. pull plate; 503. pull rod; 504. Block; 6. Reset assembly; 601. Reset plate; 602. Reset spring; 7. Mounting mechanism; 701. Protective shell; 702. Electric push rod; 703. Trapezoidal block; 704. Connecting rod; 705. Side abutment plate; 706. L-shaped block; 707. Bottom abutment plate; 8. Detection mechanism; 801. Mounting plate; 802. Concentrating pipe; 803. Diverter pipe; 804. Water stop plate; 805. Partition plate; 806. Filter paper; 807. Top plate; 808. Sensor; 9. Fitting assembly; 901. Slider; 902. Slide groove; 10. Support frame. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0034] Please see attached Figure 1 - Attachment Figure 3 The embodiment of the present invention provides an extremely water-repellent soil critical water head tester, including a test box 1, the test box 1 is used to place the soil to be tested, and is made of organic glass. Support frames 10 are installed on both the left and right sides of the bottom of the test box 1. A bottom plate 4 is installed on the side of the support frame 10 away from the test box 1. The support frame 10 is used to connect the test box 1 and the bottom plate 4 to provide good support for the test box 1. A sand test mechanism 2 and a clay test mechanism 3 are respectively arranged on the top of one end of the bottom plate 4 away from the test box 1. A detection mechanism 8 is arranged inside the test box 1, and a fixing mechanism 5 is arranged on both the front and rear sides of the top of the test box 1;

[0035] Please see attached Figure 1 , Attachment Figure 5 , Attachment Figure 6The detection mechanism 8 includes a mounting plate 801, which is mounted on a side of the test box 1 close to the support frame 10. A concentrating pipe 802 is mounted on a side of the mounting plate 801 away from the test box 1. A side of the concentrating pipe 802 close to the test box 1 is connected to a plurality of shunt pipes 803 through a pipeline. The mounting plate 801 is used to connect and install the concentrating pipe 802 and the shunt pipe 803. The shunt pipe 803 is connected to a plurality of concentrating pipes 802. When water is transported into the test box 1, the water flows into the test box 1 through a plurality of shunt pipes 803. A water stop plate 804 is provided on the outer periphery of a side of the plurality of shunt pipes 803 close to the test box 1. The water stop plate 804 is used to prevent side wall seepage from occurring during water injection into the test box 1. The water stop plate 804 is provided between the water stop plate 804 and the shunt pipe 803. A filter paper 806 is provided correspondingly between the test box 1 and the test box 1. A plurality of intersecting partitions 805 are installed inside the test box 1. The plurality of partitions 805 are staggered to separate the internal space of the test box 1, so that different soils can be tested. A top plate 807 is slidably provided on the top of the test box 1. A filter paper 806 is provided between the top plate 807 and the test box 1. The top plate 807 is a rectangular plate with through holes for exhausting air in the soil sample, so that the test effect is better. A sensor 808 is provided on the side of the test box 1 away from the sand test mechanism 2 and the clay test mechanism 3. The sensor 808 is used to detect the wetting range and wetting speed in the soil sample, and the detection data can be transmitted to the computer in real time. The front and rear sides of the mounting plate 801 are provided with mounting mechanisms 7.

[0036] Please see attached Fig.10 The two fixing mechanisms 5 both include a fixing handle 501, which is respectively mounted on the front and rear sides of the test box 1. The fixing handle 501 is used to fix the top plate 807 to prevent the soil sample in the test box 1 from being washed away by excessive water head. A pull rod 503 is slidably connected to the inside of the fixing handle 501 close to the top plate 807. A pull plate 502 is fixed to the end of the pull rod 503 away from the fixing handle 501. A block 504 is fixed to the side of the pull rod 503 close to the test box 1. The pull rod 503 is connected to the pull plate 502 and the block 504. The pull plate 502 facilitates the pulling of the pull rod 503 to move, so that the block 504 can be driven to move together when the pull rod 503 moves. A reset component 6 is provided on the periphery of the pull rod 503.

[0037] Please see attached Figure 2The sand test mechanism 2 includes a water tank 201, which is installed on the side of the bottom plate 4 away from the test box 1. The water tank 201 is used to provide water for the test. A water pump 203 and a water inlet pipe 202 are fixed on the side of the water tank 201 away from the bottom plate 4. The water pump 203 is used to extract the water stored in the water tank 201, and the water inlet pipe 202 is used to inject test water into the water tank 201. A water delivery pipe 204 is installed on the side of the water pump 203 away from the water tank 201. A control valve 205 is installed on the end of the water delivery pipe 204 away from the water pump 203. The control valve 205 is away from the water delivery pipe. A water pipe 206 is installed at one end of the first water pipe 204. The water pipe 204 and the second water pipe 206 are used to transport test water. The water flow rate can be adjusted by setting a control valve 205 between the first water pipe 204 and the second water pipe 206. After the test water in the water tank 201 is pumped out by the water pump 203, the power of the water pump 203 can be reduced and the water flow rate can be controlled by the control valve 205. The end of the second water pipe 206 away from the control valve 205 is fixed to the side of the concentrating pipe 802 away from the test box 1, and a fixing rod 207 is provided on the rear side of the water tank 201.

[0038] Please see attached Figure 3 The clay test mechanism 3 includes two support rods 304, and the two support rods 304 slide on the top of the bottom plate 4 away from the test box 1. A fixing ring 303 is fixed on the top of the two support rods 304, and a water injection piston 301 is fixed on the side of the fixing ring 303 away from the bottom plate 4. The function of the water injection piston 301 is the same as that of the water tank 201 and the water pump 203, and water is injected into the test box 1. The fixing ring 303 and the support rods 304 are used to provide support for the water injection piston 301. The end of the water injection piston 301 away from the bottom plate 4 is rotated with a rotating handle 302, and the rotating handle 302 is used to control the flow of water. A moving block 305 is fixed on the opposite side of the two support rods 304, and the moving block 305 is connected to the support rod 304. When the support rod 304 moves along the bottom plate 4, the moving block 305 will also move with the support rod 304. The support rod 304 moves together, and the internal thread of the moving block 305 is connected with a fixing bolt 306, and the fixing bolt 306 is used to contact the bottom plate 4, so that after the water injection piston 301 moves to the appropriate position, the moving block 305 can be fixed by the fixing bolt 306. The internal sliding of the moving block 305 is provided with a sliding rod 307, and the sliding rod 307 is used to guide the movement of the moving block 305. A pressure gauge 308 is installed on the side of the water injection piston 301 close to the bottom plate 4. The water injection piston 301 also injects test water into the test box 1 through the water pipe 1 204 and the water pipe 2 206, and a pressure gauge 308 for detecting the internal pressure of the water pipe 1 204 and the water pipe 2 206 is also installed between the water pipe 1 204 and the water pipe 2 206, and a control valve 205 for controlling the flow of water is also installed.

[0039] Please see attached Figure 7 - Attachment Figure 8 The mounting mechanism 7 includes a side abutment plate 705, which is slidably connected to the side of the mounting plate 801 away from the test box 1. A connecting rod 704 is fixed to the side of the side abutment plate 705 away from the mounting plate 801. The side abutment plate 705 contacts the side of the mounting plate 801. By applying a force to the left and right sides of the mounting plate 801 through the two side abutment plates 705, the mounting plate 801 will not be easily shaken. A protective shell 701 is provided on the periphery of the connecting rod 704. The inside of the protective shell 701 is close to An electric push rod 702 is provided on one side of the bottom plate 4, and a protective shell 701 is used to protect the internal components. The electric push rod 702 is a short-stroke electric push rod with a model of La12, which is used to provide driving force. Two trapezoidal blocks 703 are provided inside the protective shell 701, one of which is fixed to the end of the connecting rod 704 away from the side abutment plate 705, and the other trapezoidal block 703 is fixed to the top of the electric push rod 702. The two trapezoidal blocks 703 inside the protective shell 701 are abutted against each other by their hypotenuses, and one of the trapezoidal blocks 703 is fixed to the end of the connecting rod 704 away from the side abutment plate 705. The electric push rod 702 is fixed at the telescopic end, so that the trapezoidal block 703 connected to the telescopic end is controlled to move after the electric push rod 702 is started. When the trapezoidal block 703 connected to the electric push rod 702 moves vertically, the trapezoidal block 703 connected to the connecting rod 704 will move horizontally due to the inclined surface force. The other trapezoidal block 703 is fixed with L-shaped blocks 706 on both sides. The side of the L-shaped block 706 close to the test box 1 is fixed with a bottom abutment plate 707. The L-shaped block 706 is used to connect the ladder fixed on the top of the electric push rod 702. The L-shaped block 703 and the bottom abutment plate 707, when the trapezoidal block 703 fixed on the top of the movable push rod 702 moves vertically, the bottom abutment plate 707 can be driven to move upward together through the L-shaped block 706, and the side of the bottom abutment plate 707 away from the bottom plate 4 is slidably connected to the side of the test box 1 close to the bottom plate 4, and the L-shaped block 706 is slidably connected to the inside of the protective shell 701. When the bottom abutment plate 707 contacts the bottom of the test box 1, it can provide support for the test box 1. The facing sides of the two trapezoidal blocks 703 are provided with a mating component 9.

[0040] Please see attached Fig.10The reset assembly 6 includes a reset plate 601, which is fixed to the outer periphery of the pull rod 503. The reset plate 601 is connected to the pull rod 503. When the pull rod 503 moves, the reset plate 601 can move with the pull rod 503. A reset spring 602 is fixed on the side of the reset plate 601 away from the block 504. The reset spring 602 is sleeved on the outer periphery of the pull rod 503. One end of the reset spring 602 away from the reset plate 601 is fixed inside the fixed handle 501. The reset spring 602 is used to The reset plate 601 provides a reset thrust. When the reset plate 601 moves, it will apply a force to the reset spring 602, so that the reset spring 602 contracts. When the pull rod 503 loses its active force, the reset spring 602 will correspondingly lose the force of the reset plate 601. At this time, the reset spring 602 will produce a reset movement, and then apply a force to the reset plate 601, so that the reset plate 601 moves. Further, the reset plate 601 will drive the pull rod 503 to move to complete the reset movement.

[0041] Please refer to the attached Fig. 9 The interlocking component 9 includes a slider 901, which fixes the top of another trapezoidal block 703. A slide groove 902 is opened inside one of the trapezoidal blocks 703. The slider 901 is slidably connected inside the slide groove 902. The slider 901 is an isosceles trapezoid, and the corresponding liquid level of the slide groove 902 is an isosceles trapezoid. When the slider 901 slides in the slide groove 902, a force can be applied to the trapezoidal block 703 connected to the connecting rod 704, so that the trapezoidal block 703 moves.

[0042] Working principle: When testing sand, first insert the mounting plate 801 at the bottom of the test box 1, so that multiple diversion pipes 803 enter the test box 1, then sleeve the water stop plate 804 on the outer periphery of the central pipe 802, and insert multiple water stop plates 804 into the test box 1 in a cross-connected manner, and then place the mounting plate 801 on top of the two support frames 10;

[0043] Then, the electric push rod 702 is started, and the electric push rod 702 controls the trapezoidal block 703 fixed on the top to move vertically. When the trapezoidal block 703 on the top of the electric push rod 702 moves, the trapezoidal block 703 connected to the connecting rod 704 will move horizontally, and the slider 901 will slide in the slide groove 902, so that the trapezoidal block 703 connected to the connecting rod 704 can move horizontally in time. When moving vertically with the trapezoidal block 703, the bottom abutment plate 707 connected by the L-shaped block 706 will contact the bottom of the test box 1, and when the trapezoidal block 703 moves horizontally, the connecting rod 704 will drive the side abutment plate 705 to contact the side of the mounting plate 801, and the bottom abutment plate 707 and the side abutment plate 705 can make the connection between the mounting plate 801 and the test box 1 more precise.

[0044] After the mounting plate 801 is tightly connected to the test box 1, the soil sample can be placed in the test box 1, and then the filter paper 806 is placed on the top of the test box 1, and then the top plate 807 is placed on the top of the mounting plate 801. After the top plate 807 is placed on the top of the mounting plate 801, the pull rod 503 is pulled by the pull plate 502, and when the pull rod 503 moves, the block 504 can be moved together, and when the pull rod 503 moves, it will drive the reset plate 601 to move together, so that the reset plate 601 will apply a force to the reset spring 602 to shrink the reset spring 602, and then the fixed handle 501 is abutted against the top of the water stop plate 804, and then the pull plate 502 is released, and the reset spring 602 is reset to push the reset plate 601 to move, so that the reset plate 601 drives the pull rod 503 to move, so that the pull rod 503 drives the block 504 to move, and the block 504 slides into the water stop plate 804, so that the water stop plate 804 is fixed to the top of the test box 1;

[0045] Then, the water supply pipe 206 is connected to the central pipe 802, and the water pump 203 is started to inject water into the test box 1 through the water supply pipe 1 204 and the water supply pipe 2 206. Then, the water flow rate is adjusted by the control valve 205. When the test box 1 contains a clay sample, the water supply pipe 206 at the bottom of the water injection piston 301 is connected to the central pipe 802. Then, by rotating the rotating handle 302, the test water enters the control valve 205 and the water supply pipe 2 206 from the water injection piston 301, so that the clay sample can be tested for water repellency.

[0046] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An extremely hydrophobic soil critical water head tester, comprising a test box (1), characterized in that: Support frames (10) are installed on both left and right sides of the bottom of the test box (1); a bottom plate (4) is installed on the side of the support frame (10) away from the test box (1); a sand test mechanism (2) and a clay test mechanism (3) are respectively provided on the top of the end of the bottom plate (4) away from the test box (1); a detection mechanism (8) is provided inside the test box (1); and a fixing mechanism (5) is provided on both the front and rear sides of the top of the test box (1); The detection mechanism (8) comprises a mounting plate (801), the mounting plate (801) being mounted on a side of the test box (1) close to the support frame (10), a central tube (802) being mounted on a side of the mounting plate (801) away from the test box (1), a side of the central tube (802) close to the test box (1) being connected to a plurality of flow diversion tubes (803) via a pipeline, and a stopper is provided on the outer periphery of a side of the plurality of flow diversion tubes (803) close to the test box (1). A water plate (804) is provided inside the test box (1), a plurality of intersecting partitions (805) are installed, a top plate (807) is slidably provided on the top of the test box (1), a filter paper (806) is provided between the top plate (807) and the test box (1), a sensor (808) is provided on the side of the test box (1) away from the sand test mechanism (2) and the clay test mechanism (3), and mounting mechanisms (7) are provided on both the front and rear sides of the mounting plate (801).

2. The extremely hydrophobic soil critical water head tester according to claim 1, characterized in that: The two fixing mechanisms (5) each comprise a fixing handle (501), and the two fixing handles (501) are respectively mounted on the front and rear sides of the test box (1), and a pull rod (503) is slidably connected to the inside of the fixing handle (501) close to the top plate (807), and a pull plate (502) is fixed to the end of the pull rod (503) away from the fixing handle (501), and a clamping block (504) is fixed to the side of the pull rod (503) close to the test box (1), and a reset assembly (6) is provided on the periphery of the pull rod (503).

3. The extremely hydrophobic soil critical water head tester according to claim 1, characterized in that: The sand and soil testing mechanism (2) comprises a water tank (201), the water tank (201) being mounted on a side of the bottom plate (4) away from the test box (1), a water pump (203) and a water inlet pipe (202) being fixed to the side of the water tank (201) away from the bottom plate (4), a water delivery pipe 1 (204) being mounted on the side of the water pump (203) away from the water tank (201), a control valve (205) being mounted on one end of the water delivery pipe 1 (204) away from the water pump (203), a water delivery pipe 2 (206) being mounted on one end of the control valve (205) away from the water delivery pipe 1 (204), and a fixing rod (207) being mounted on the rear side of the water tank (201).

4. The extremely water-repellent soil critical water head tester according to claim 3, characterized in that: The clay test mechanism (3) comprises two support rods (304), the two support rods (304) slide on the top of the side of the bottom plate (4) away from the test box (1), a fixing ring (303) is fixed on the top of the two support rods (304), a water injection piston (301) is fixed on the side of the fixing ring (303) away from the bottom plate (4), a rotating handle (302) is rotatably arranged at one end of the water injection piston (301) away from the bottom plate (4), a moving block (305) is fixed on the opposite side of the two support rods (304), a fixing bolt (306) is connected to the inner thread of the moving block (305), a sliding rod (307) slides inside the moving block (305), and a pressure gauge (308) is installed on the side of the water injection piston (301) close to the bottom plate (4).

5. The extremely hydrophobic soil critical water head tester according to claim 1, characterized in that: The mounting mechanism (7) comprises a side abutment plate (705), the side abutment plate (705) being slidably connected to a side of the mounting plate (801) away from the test box (1), a connecting rod (704) being fixed to a side of the side abutment plate (705) away from the mounting plate (801), a protective shell (701) being provided on the periphery of the connecting rod (704), an electric push rod (702) being provided on a side of the protective shell (701) close to the bottom plate (4), and two electric push rods (702) being provided inside the protective shell (701). The invention relates to a plurality of trapezoidal blocks (703), wherein one of the trapezoidal blocks (703) is fixed to one end of the connecting rod (704) away from the side abutment plate (705), the other trapezoidal block (703) is fixed to the top of the electric push rod (702), the other trapezoidal block (703) is fixed with L-shaped blocks (706) on both sides, the side of the L-shaped block (706) close to the test box (1) is fixed with a bottom abutment plate (707), and the two trapezoidal blocks (703) are provided with a mating assembly (9) on the opposite sides thereof.

6. The extremely hydrophobic soil critical water head tester according to claim 2, characterized in that: The reset assembly (6) comprises a reset plate (601), wherein the reset plate (601) is fixed to the outer periphery of the pull rod (503), and a reset spring (602) is fixed to a side of the reset plate (601) away from the clamping block (504).

7. The extremely water-repellent soil critical water head tester according to claim 3, characterized in that: One end of the second water delivery pipeline (206) away from the control valve (205) is fixed to a side of the central pipe (802) away from the test box (1).

8. The extremely water-repellent soil critical water head tester according to claim 5, characterized in that: The interlocking component (9) comprises a slider (901), wherein the slider (901) fixes the top of another trapezoidal block (703), wherein a slide groove (902) is provided inside one of the trapezoidal blocks (703), and the slider (901) is slidably connected inside the slide groove (902).

9. The extremely hydrophobic soil critical water head tester according to claim 6, characterized in that: The return spring (602) is sleeved on the outer circumference of the pull rod (503), and one end of the return spring (602) away from the return plate (601) is fixed inside the fixed handle (501).

10. The extremely hydrophobic soil critical water head tester according to claim 5, characterized in that: The side of the bottom abutment plate (707) away from the bottom plate (4) is slidably connected to the side of the test box (1) close to the bottom plate (4), and the L-shaped block (706) is slidably connected to the inside of the protective shell (701).

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