Sandy loess dry-wet cycle test device and method

Abstract

The invention provides a dry-wet cycle test device and method for sandy loess, and belongs to the technical field of dry-wet cycle test of loess. The sandy loess dry-wet cycle test device comprises a base and a rack, the rack is fixedly installed on the surface of the base, a test mechanism is installed on the surface of the base and used for detecting the moisture content of loess, the test mechanism comprises a base, a sample barrel, a first motor and a support, the base is fixedly installed on the surface of the base, and a test table is rotatably installed in an inner cavity of the base and used for detecting the moisture content of the loess. The sample cylinders are symmetrically installed in an inner cavity of the test board and used for storing loess samples. By arranging the testing mechanism, a loess sample is put into the two sample cylinders, the sample cylinders are sequentially put into the testing table, the testing table can be driven to rotate through the first motor, so that the two sample cylinders are converted, and when the sample cylinders rotate to the bottom of the support, the moisture tester can be driven to descend through the telescopic rod and is inserted into the loess sample, so that the loess sample can be detected. The water content of the loess samples is detected, alternate detection of the loess samples is achieved, and the detection efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of loess dry-wet cycle testing, and in particular to a device and method for sandy loess dry-wet cycle testing. Background Art

[0002] Sandy loess refers to loess soil with a high sand content. It is between typical loess and sandy soil, containing a large amount of silt and a certain proportion of fine sand or medium sand. It has poor self-weight compaction and a mostly single-grain or weak structure. After immersion in water, the structure quickly deteriorates and is prone to geological disasters such as collapse and landslides. In engineering practice, projects such as highways, railway roadbeds, slope support, and building foundations often involve sandy loess, and its stability has a significant impact on project safety. Under natural conditions, sandy loess is frequently subjected to environmental influences such as rainfall and evaporation, and is in a state of alternating dryness and wetness for a long time, resulting in significant changes in the internal structure, strength, and physical and mechanical properties of the soil. Water intrusion causes the cementation between particles to break down, and new microcracks form during drying. With the increase in the number of dry-wet cycles, the shear strength gradually decreases. Each cycle may lead to irreversible deformation, ultimately causing foundation settlement or slope instability. Therefore, studying the physical and mechanical changes of sandy loess during the dry-wet cycle is of great significance for predicting its engineering stability.

[0003] The moisture content of sandy loess directly affects its mechanical properties. Changes in soil moisture content are closely related to soil strength, compaction, cohesion, and stability. Therefore, existing sandy loess wet-dry cycle testing machines generally determine the mechanical properties of loess samples by repeatedly soaking and drying them and measuring the changes in their moisture content. However, soaking and drying the loess in sequence often takes a lot of time, resulting in low experimental efficiency. Summary of the Invention

[0004] In order to remedy the above deficiencies, the present invention provides a device and method for sandy loess dry-wet cycle testing that overcomes the above technical problems or at least partially solves the above problems.

[0005] The present invention is achieved in that: The present invention provides a sandy loess dry-wet cycle test device, comprising a base and a frame, wherein the frame is fixedly mounted on the surface of the base, and a testing mechanism is mounted on the surface of the base for detecting the moisture content of the loess. The testing mechanism comprises: A base, the base is fixedly mounted on the surface of the base, and a test bench is rotatably mounted in the inner cavity of the base; A sample cylinder, symmetrically mounted in the inner cavity of the test bench, for storing loess samples; A first motor, wherein the first motor is fixedly mounted in the inner cavity of the base, and a first rotating shaft is connected between an output end of the first motor and the test bench; The bracket is fixedly installed in the inner cavity of the frame, a telescopic rod is fixedly installed in the bracket, and a moisture tester is installed at the telescopic end of the telescopic rod for detecting the moisture content of loess.

[0006] In a preferred solution, a spray mechanism is installed in the inner cavity of the frame for moistening the loess sample. The spray mechanism includes a water supply tank, a nozzle and a water storage tank. The water supply tank is fixedly installed in the inner cavity of the frame. The side wall of the water supply tank is connected to the nozzle. A water storage tank is installed in the inner cavity of the base for storing water. A water pump is installed on the surface of the water storage tank. The water inlet end of the water pump is connected to the inner cavity of the water storage tank by a water pipe, and the water outlet end of the water pump is connected to the water supply tank by a water pipe.

[0007] In a preferred embodiment, a bottom plate is slidably mounted in the inner cavity of the sample tube, key slots are symmetrically provided on the side walls of the bottom plate, key teeth are symmetrically fixedly mounted in the inner cavity of the sample tube, the key teeth are engaged with the key slots, and a second rotating shaft is rotatably mounted in the inner cavity of the bottom plate.

[0008] In a preferred solution, a contact block is provided at one end of the second rotating shaft, a mounting plate is fixedly installed on the inner wall of the base, a first convex ring is fixedly installed on the surface of the mounting plate for driving the second rotating shaft to move upward, and a gravity sensor is installed in the inner cavity of the first convex ring for weighing the loess sample.

[0009] In a preferred solution, a crushing knife is fixedly installed at one end of the second rotating shaft for crushing the dried loess sample, a first gear is fixedly installed on the surface of the second rotating shaft, a third rotating shaft is rotatably installed in the inner cavity of the mounting plate, a second gear is fixedly installed at one end of the third rotating shaft, the second gear is adapted to the first gear, a second motor is fixedly installed in the inner cavity of the base, and the output end of the second motor is fixedly connected to one end of the third rotating shaft.

[0010] In a preferred embodiment, a water outlet is provided in the inner cavity of the water supply box, a water pipe is connected between the water outlet and the nozzle, a limit frame is fixedly installed in the inner cavity of the water supply box, and a plug is slidably installed in the inner cavity of the limit frame for closing the water outlet.

[0011] In a preferred solution, a pull rod is fixedly installed on the surface of the plug, a float is fixedly installed on the surface of the pull rod, a first spring is sleeved on the surface of the pull rod, one end of the first spring is fixedly connected to the limit frame, and the other end of the first spring is fixedly connected to the plug, which is used to drive the plug to move downward, and a number of drainage holes are opened on the side wall of the plug.

[0012] In a preferred embodiment, a drying mechanism is installed on the surface of the base for drying loess samples. The drying mechanism includes a hot air blower and filter holes. The hot air blower is fixedly installed on the side wall of the frame for drying loess samples. The side wall of the sample tube is provided with several filter holes for drainage.

[0013] In a preferred solution, the sample tube is slidably sleeved with a sealing ring for closing the filter hole, a mounting ring is fixedly mounted on the surface of the sample tube, a guide rod is symmetrically fixedly mounted on the bottom of the mounting ring, the guide rod is slidably connected to the sealing ring, a second spring is sleeved on the surface of the guide rod, one end of the second spring is fixedly connected to the mounting ring, and the other end of the second spring is fixedly connected to the sealing ring for driving the sealing ring to move downward.

[0014] In a preferred solution, a push rod is fixedly mounted on the bottom of the sealing ring, a second convex ring is fixedly mounted on the surface of the base for driving the push rod to move upward, and a waste outlet is provided on the side wall of the base for discharging waste water.

[0015] A sandy loess dry-wet cycle test method, applicable to the above-mentioned sandy loess dry-wet cycle test device, comprises the following steps: S1: Test: Place the loess sample into two sample tubes, and then place the sample tubes into the test bench in turn. The first motor can drive the test bench to rotate, thereby switching the two sample tubes. When the sample tubes rotate to the bottom of the bracket, the telescopic rod can drive the moisture tester to descend and insert it into the loess sample to test its moisture content. S2: spraying; when the first motor drives the sample tube to rotate to the bottom of the nozzle, the second rotating shaft moves from the first convex ring to the surface of the gravity sensor, pushing the bottom plate up to lift the loess sample in the sample tube, and transferring the weight of the loess sample from the second rotating shaft to the surface of the gravity sensor, realizing the gravity detection of the loess sample, and controlling the water pumping amount according to its weight to ensure that the loess sample can be fully wetted, and when the contact block moves to the surface of the gravity sensor, the first gear engages with the second gear, and controls the second motor to drive the third rotating shaft to rotate, thereby driving the crushing knife to rotate, crushing the dried loess sample, and helping to distribute the moisture more evenly in the loess sample; S3: Drying; when the first motor drives the sample tube to rotate to the bottom of the nozzle, under the action of the second spring, the sealing ring is driven to move downward to seal the filter hole. When the first motor drives the sample tube to rotate to the bottom of the hot air blower, the loess sample is dried by the hot air blower, and at this time the second convex ring drives the push rod to move upward, driving the sealing ring to move upward synchronously, canceling the closure of the filter hole, and the water in the loess sample can be discharged from the filter hole synchronously.

[0016] The present invention provides a device and method for testing dry-wet cycles of sandy loess, which have the following beneficial effects: 1. By setting up a testing mechanism, the loess sample is placed in two sample tubes, and the sample tubes are placed in the test bench in turn. The test bench can be driven to rotate by the first motor to convert the two sample tubes. When the sample tube rotates to the bottom of the bracket, the moisture tester can be driven down by the telescopic rod and inserted into the loess sample to detect its moisture content. This can realize alternating detection of loess samples and improve detection efficiency.

[0017] 2. By setting up a spray mechanism, when the first motor drives the sample tube to rotate to the bottom of the nozzle, the second rotating shaft moves from the first convex ring to the surface of the gravity sensor, pushing the bottom plate up, lifting the loess sample in the sample tube, and transferring the weight of the loess sample from the second rotating shaft to the surface of the gravity sensor, realizing the gravity detection of the loess sample, and controlling the water pumping volume according to its weight to ensure that the loess sample can be fully wetted, and when the contact block moves to the surface of the gravity sensor, the first gear engages with the second gear, and controls the second motor to drive the third rotating shaft to rotate, thereby driving the crushing knife to rotate, crushing the dried loess sample, and helping to distribute moisture more evenly in the loess sample.

[0018] 3. By setting up a drying mechanism, when the first motor drives the sample tube to rotate to the bottom of the nozzle, under the action of the second spring, the sealing ring is driven to move downward to seal the filter hole. When the first motor drives the sample tube to rotate to the bottom of the hot air blower, the loess sample is dried by the hot air blower, and at this time the second convex ring drives the push rod to move upward, driving the sealing ring to move upward synchronously, canceling the closure of the filter hole, and the water in the loess sample can be discharged from the filter hole synchronously, thereby improving the drying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can also derive other relevant drawings based on these drawings without inventive effort. Figure 1 is a front perspective view provided by an embodiment of the present invention; Figure 2 A front view of an embodiment of the present invention is provided; Figure 3 A cross-sectional view of an embodiment of the present invention is provided; Figure 4 A cross-sectional view of a base provided for an embodiment of the present invention; Figure 5 A cross-sectional view of a sample tube provided for an embodiment of the present invention; Figure 6 A three-dimensional diagram of a base plate provided for an embodiment of the present invention; Figure 7 A partial exploded view of an embodiment of the present invention; Figure 8 A cross-sectional view of a water supply tank provided for an embodiment of the present invention; Figure 9 Provided for the embodiments of the present invention Figure 8 Enlarged view of point A in the middle.

[0020] In the figure: 1. base; 2. frame; 3. test mechanism; 301. base; 302. test bench; 303. sample tube; 304. first rotating shaft; 305. first motor; 306. bracket; 307. telescopic rod; 308. moisture tester; 4. spray mechanism; 401. water supply tank; 402. nozzle; 403. water storage tank; 404. water pump; 405. bottom plate; 406. keyway; 407. key teeth; 408. second rotating shaft; 409. contact block; 410. mounting plate; 411. first convex ring; 412. Gravity sensor; 413, crushing knife; 414, first gear; 415, third rotating shaft; 416, second gear; 417, second motor; 418, water outlet; 419, limit frame; 420, plug; 421, pull rod; 422, float; 423, first spring; 424, drain hole; 5, drying mechanism; 501, hot air blower; 502, filter hole; 503, sealing ring; 504, mounting ring; 505, guide rod; 506, second spring; 507, push rod; 508, second convex ring; 509, waste outlet. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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 making creative efforts shall fall within the scope of protection of the present invention.

[0022] Reference Figures 1-9As shown, the present invention provides a technical solution: a sandy loess dry-wet cycle test device, including a base 1 and a frame 2, the frame 2 is fixedly mounted on the surface of the base 1, the surface of the base 1 is equipped with a test mechanism 3 for detecting the moisture content of the loess, the test mechanism 3 includes a base 301, a sample tube 303, a first motor 305 and a bracket 306, the base 301 is fixedly mounted on the surface of the base 1, the inner cavity of the base 301 is rotatably equipped with a test table 302, the sample tube 303 is symmetrically mounted in the inner cavity of the test table 302, and the test table 302 is used to detect the moisture content of the loess. For storing loess samples, the first motor 305 is fixedly installed in the inner cavity of the base 1, and a first rotating shaft 304 is connected between the output end of the first motor 305 and the test bench 302. The first motor 305 can drive the test bench 302 to rotate, thereby converting the two sample tubes 303 and testing them in turn. The bracket 306 is fixedly installed in the inner cavity of the frame 2, and a telescopic rod 307 is fixedly installed in the bracket 306. A moisture tester 308 is installed at the telescopic end of the telescopic rod 307 for testing the moisture content of loess.

[0023] In a preferred embodiment, when in use, the loess sample is placed in two sample tubes 303, and the sample tubes 303 are placed in the test bench 302 in turn. The test bench 302 can be driven to rotate by the first motor 305, thereby converting the two sample tubes 303. When the sample tube 303 rotates to the bottom of the bracket 306, the moisture tester 308 can be driven to descend by the telescopic rod 307 and inserted into the loess sample to detect its moisture content. This can realize alternating detection of loess samples and improve detection efficiency.

[0024] Reference Figures 1-9 As shown, in a preferred embodiment, a spray mechanism 4 is installed in the inner cavity of the frame 2 for moistening the loess sample. The spray mechanism 4 includes a water supply tank 401, a nozzle 402 and a water storage tank 403. The water supply tank 401 is fixedly installed in the inner cavity of the frame 2. The side wall of the water supply tank 401 is connected to the nozzle 402. The inner cavity of the base 1 is equipped with a water storage tank 403 for storing water. A water pump 404 is installed on the surface of the water storage tank 403. The water inlet end of the water pump 404 is connected to the inner cavity of the water storage tank 403 by a water pipe, and the water outlet end of the water pump 404 is connected to the water supply tank 401 by a water pipe. When the sample tube 303 rotates to the bottom of the nozzle 402, the water in the water storage tank 403 can be injected into the water supply tank 401 through the water pump 404, and the nozzle 402 sprays water to moisten the loess sample in the sample tube 303, thereby simulating rainwater.

[0025] Reference Figures 1-9As shown, in a preferred embodiment, a bottom plate 405 is slidably installed in the inner cavity of the sample tube 303 for lifting the loess sample in the sample tube 303, and a key groove 406 is symmetrically opened on the side wall of the bottom plate 405. Key teeth 407 are symmetrically fixedly installed in the inner cavity of the sample tube 303, and the key teeth 407 are engaged with the key groove 406. A second rotating shaft 408 is rotatably installed in the inner cavity of the bottom plate 405, and a contact block 409 is provided at one end of the second rotating shaft 408. A mounting plate 410 is fixedly installed on the inner wall of the base 301, and a first convex ring 411 is fixedly installed on the surface of the mounting plate 410 for driving the second rotating shaft 40 8 moves upward, a gravity sensor 412 is installed in the inner cavity of the first convex ring 411 for weighing the loess sample. When the first motor 305 drives the sample tube 303 to rotate to the bottom of the nozzle 402, the second rotating shaft 408 is moved from the first convex ring 411 to the surface of the gravity sensor 412, pushing the bottom plate 405 to move upward, lifting the loess sample in the sample tube 303, and transferring the weight of the loess sample from the second rotating shaft 408 to the surface of the gravity sensor 412, realizing the gravity detection of the loess sample, and controlling the water pumping amount of the water pump 404 according to its weight to ensure that the loess sample can be fully wetted.

[0026] Reference Figures 1-9 As shown, in a preferred embodiment, a crushing knife 413 is fixedly installed at one end of the second rotating shaft 408 for crushing the dried loess sample, a first gear 414 is fixedly installed on the surface of the second rotating shaft 408, a third rotating shaft 415 is rotatably installed in the inner cavity of the mounting plate 410, a second gear 416 is fixedly installed at one end of the third rotating shaft 415, the second gear 416 is adapted to the first gear 414, a second motor 417 is fixedly installed in the inner cavity of the base 1, and the output end of the second motor 417 is fixedly connected to one end of the third rotating shaft 415 When the contact block 409 moves to the surface of the gravity sensor 412, the first gear 414 engages with the second gear 416, and controls the second motor 417 to drive the third shaft 415 to rotate, thereby driving the crushing knife 413 to rotate, crushing the dried loess sample, and helping to distribute moisture more evenly in the loess sample. During the repeated wetting and drying process, the loess sample may have different levels of moisture distribution. Turning can prevent moisture from being too concentrated in a certain part of the soil, so that the wetness and dryness of each part are more balanced.

[0027] Reference Figures 1-9As shown, in a preferred embodiment, a water outlet hole 418 is provided in the inner cavity of the water supply tank 401, and a water pipe is connected between the water outlet hole 418 and the nozzle 402. A limiting frame 419 is fixedly installed in the inner cavity of the water supply tank 401, and a plug 420 is slidably installed in the inner cavity of the limiting frame 419 for closing the water outlet hole 418. A pull rod 421 is fixedly installed on the surface of the plug 420, and a float 422 is fixedly installed on the surface of the pull rod 421. A first spring 423 is sleeved on the surface of the pull rod 421, and one end of the first spring 423 is fixedly connected to the limiting frame 419, and the other end of the first spring 423 is fixedly connected to the plug 420 for driving the plug 420 to move downward. The side wall of the plug 420 is provided with a There are several drainage holes 424. When the loess sample is sprayed through the nozzle 402, the water level in the water supply tank 401 is high at the beginning, and the float 422 floats up. Under the action of buoyancy, the plug 420 is driven to move upward. The plug 420 will not block the water outlet hole 418, so water enters the nozzle 402 from the water outlet hole 418. At this time, the water flow is large. As the water level in the water supply tank 401 gradually drops, the float 422 gradually decreases, and the first spring 423 resets, driving the plug 420 to close the water outlet hole 418. At this time, water enters the nozzle 402 from the drainage hole 424, and the water flow is small, and the loess sample begins to be drip-irrigated to ensure that the loess sample fully absorbs water.

[0028] In a preferred embodiment, when the first motor 305 drives the sample tube 303 to rotate to the bottom of the nozzle 402, the second rotating shaft 408 is moved by the first convex ring 411 to the surface of the gravity sensor 412, pushing the bottom plate 405 to move upward, lifting the loess sample in the sample tube 303, and transferring the weight of the loess sample from the second rotating shaft 408 to the surface of the gravity sensor 412, realizing the gravity detection of the loess sample, and controlling the water pumping amount of the water pump 404 according to its weight to ensure that the loess sample can be fully wetted, and when the contact block 409 moves to the surface of the gravity sensor 412, the first gear 414 engages with the second gear 416, and controls the second motor 417 to drive the third rotating shaft 415 to rotate, thereby driving the crushing knife 413 to rotate. The dried loess sample is crushed to help distribute the moisture more evenly in the loess sample. In addition, when the loess sample is sprayed through the nozzle 402, the water level in the water supply tank 401 is high at the beginning, and the float 422 floats up. Under the action of buoyancy, the plug 420 is driven to move upward. The plug 420 does not block the water outlet 418, so water enters the nozzle 402 from the water outlet 418. At this time, the water flow is large. As the water level in the water supply tank 401 gradually decreases, the float 422 gradually decreases, and the first spring 423 resets, driving the plug 420 to close the water outlet 418. At this time, water enters the nozzle 402 from the drainage hole 424, and the water flow is small, and the loess sample begins to be drip-irrigated to ensure that the loess sample fully absorbs moisture.

[0029] Reference Figure 1-Figure 5 As shown, in a preferred embodiment, a drying mechanism 5 is installed on the surface of the base 1 for drying the loess sample. The drying mechanism 5 includes a hot air blower 501 and a filter hole 502. The hot air blower 501 is fixedly installed on the side wall of the frame 2 for drying the loess sample. A plurality of filter holes 502 are opened on the side wall of the sample tube 303 for drainage. The sample tube 303 is slidably sleeved with a sealing ring 503 for sealing the filter hole 502.

[0030] Reference Figure 1-Figure 5 As shown, in a preferred embodiment, a mounting ring 504 is fixedly mounted on the surface of the sample tube 303, and a guide rod 505 is symmetrically fixedly mounted on the bottom of the mounting ring 504. The guide rod 505 is slidingly connected to the sealing ring 503, and a second spring 506 is sleeved on the surface of the guide rod 505. One end of the second spring 506 is fixedly connected to the mounting ring 504, and the other end of the second spring 506 is fixedly connected to the sealing ring 503, which is used to drive the sealing ring 503 to move downward and close the filter hole 502. A push rod 507 is fixedly mounted on the bottom of the sealing ring 503, and a second convex ring 508 is fixedly mounted on the surface of the base 1 to drive the push rod 507 to move upward. A waste outlet 509 is provided on the side wall of the base 301 for discharging waste water.

[0031] In a preferred embodiment, when the first motor 305 drives the sample tube 303 to rotate to the bottom of the nozzle 402, under the action of the second spring 506, the sealing ring 503 is driven to move downward to seal the filter hole 502. When the first motor 305 drives the sample tube 303 to rotate to the bottom of the hot air blower 501, the loess sample is dried by the hot air blower 501, and at this time the second convex ring 508 drives the push rod 507 to move upward, driving the sealing ring 503 to move upward synchronously, canceling the closure of the filter hole 502, and the water in the loess sample can be discharged synchronously from the filter hole 502, thereby improving the drying efficiency.

[0032] Specifically, the working principle of the sandy loess dry-wet cycle test device and method is as follows: when in use, the loess sample is placed in two sample tubes 303, and the sample tubes 303 are placed in the test bench 302 in turn. The test bench 302 can be driven to rotate by the first motor 305, thereby converting the two sample tubes 303. When the sample tube 303 rotates to the bottom of the bracket 306, the moisture tester 308 can be driven to descend by the telescopic rod 307 and inserted into the loess sample to detect its moisture content. This can realize alternating detection of loess samples and improve detection efficiency.

[0033] When the first motor 305 drives the sample tube 303 to rotate to the bottom of the nozzle 402, the second shaft 408 is moved by the first convex ring 411 to the surface of the gravity sensor 412, pushing the bottom plate 405 upward, lifting the loess sample in the sample tube 303, and transferring the weight of the loess sample from the second shaft 408 to the surface of the gravity sensor 412, realizing the gravity detection of the loess sample, and controlling the pumping amount of the water pump 404 according to its weight, to ensure that the loess sample can be fully wetted, and when the contact block 409 moves to the surface of the gravity sensor 412, the first gear 414 meshes with the second gear 416, and controls the second motor 417 to drive the third shaft 415 to rotate, thereby driving the crushing knife 413 to rotate, The soil sample is crushed to help the water be more evenly distributed in the loess sample. In addition, when the loess sample is sprayed through the nozzle 402, the water level in the water supply tank 401 is high at the beginning, and the float 422 floats up. Under the action of buoyancy, the plug 420 is driven to move upward. The plug 420 will not block the water outlet 418, so water enters the nozzle 402 from the water outlet 418. At this time, the water flow is large. As the water level in the water supply tank 401 gradually drops, the float 422 gradually decreases, and the first spring 423 resets, driving the plug 420 to close the water outlet 418. At this time, water enters the nozzle 402 from the drainage hole 424, and the water flow is small, and the loess sample begins to be drip-irrigated to ensure that the loess sample fully absorbs water.

[0034] When the first motor 305 drives the sample tube 303 to rotate to the bottom of the nozzle 402, under the action of the second spring 506, the sealing ring 503 is driven to move downward to seal the filter hole 502. When the first motor 305 drives the sample tube 303 to rotate to the bottom of the hot air blower 501, the loess sample is dried by the hot air blower 501, and at this time the second convex ring 508 drives the push rod 507 to move upward, driving the sealing ring 503 to move upward synchronously, canceling the closure of the filter hole 502, and the water in the loess sample can be discharged from the filter hole 502 synchronously, thereby improving the drying efficiency.

[0035] A sandy loess dry-wet cycle test method, applicable to the above-mentioned sandy loess dry-wet cycle test device, comprises the following steps: S1: Test; Place the loess sample into two sample tubes 303, and place the sample tubes 303 into the test table 302 in turn. The test table 302 can be driven to rotate by the first motor 305, thereby switching the two sample tubes 303. When the sample tube 303 rotates to the bottom of the bracket 306, the moisture tester 308 can be driven to descend by the telescopic rod 307 and inserted into the loess sample to test its moisture content. S2: spraying; when the first motor 305 drives the sample tube 303 to rotate to the bottom of the nozzle 402, the second rotating shaft 408 is moved by the first convex ring 411 to the surface of the gravity sensor 412, pushing the bottom plate 405 to move upward, lifting the loess sample in the sample tube 303, and transferring the weight of the loess sample from the second rotating shaft 408 to the surface of the gravity sensor 412, realizing the gravity detection of the loess sample, and controlling the pumping amount of the water pump 404 according to its weight, to ensure that the loess sample can be fully wetted, and when the contact block 409 moves to the surface of the gravity sensor 412, the first gear 414 is engaged with the second gear 416, and controls the second motor 417 to drive the third rotating shaft 415 to rotate, thereby driving the crushing knife 413 to rotate, crushing the dried loess sample, and helping to distribute the moisture more evenly in the loess sample; S3: Drying; when the first motor 305 drives the sample tube 303 to rotate to the bottom of the nozzle 402, under the action of the second spring 506, the sealing ring 503 is driven to move downward to seal the filter hole 502. When the first motor 305 drives the sample tube 303 to rotate to the bottom of the hot air blower 501, the loess sample is dried by the hot air blower 501, and at this time the second convex ring 508 drives the push rod 507 to move upward, driving the sealing ring 503 to move upward synchronously, canceling the closure of the filter hole 502, and the water in the loess sample can be discharged synchronously from the filter hole 502.

[0036] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sandy loess dry-wet cycle test device, comprising a base (1) and a frame (2), wherein the frame (2) is fixedly mounted on the surface of the base (1), and a testing mechanism (3) is mounted on the surface of the base (1) for detecting the moisture content of the loess, characterized in that: The testing mechanism (3) comprises: A base (301), the base (301) is fixedly mounted on the surface of the base (1), and a test bench (302) is rotatably mounted in the inner cavity of the base (301); A sample cylinder (303), the sample cylinder (303) is symmetrically mounted in the inner cavity of the test bench (302) and is used to store loess samples; A first motor (305), the first motor (305) is fixedly mounted in the inner cavity of the base (1), and a first rotating shaft (304) is connected between an output end of the first motor (305) and the test bench (302); A bracket (306) is fixedly mounted in the inner cavity of the frame (2), a telescopic rod (307) is fixedly mounted in the bracket (306), and a moisture tester (308) is mounted at the telescopic end of the telescopic rod (307) for detecting the moisture content of loess.

2. The dry-wet cycle test device for sandy loess according to claim 1, characterized in that: The inner cavity of the frame (2) is provided with a spray mechanism (4) for wetting the loess sample. The spray mechanism (4) comprises a water supply tank (401), a nozzle (402) and a water storage tank (403). The water supply tank (401) is fixedly provided in the inner cavity of the frame (2). The side wall of the water supply tank (401) is connected to the nozzle (402). The inner cavity of the base (1) is provided with a water storage tank (403) for storing water. A water pump (404) is provided on the surface of the water storage tank (403). A water inlet end of the water pump (404) is connected to the inner cavity of the water storage tank (403) via a water pipe. A water outlet end of the water pump (404) is connected to the water supply tank (401) via a water pipe.

3. The dry-wet cycle test device for sandy loess according to claim 2, characterized in that: The inner cavity of the sample tube (303) is slidably mounted with a bottom plate (405), the side wall of the bottom plate (405) is symmetrically provided with a key groove (406), the inner cavity of the sample tube (303) is symmetrically fixed with key teeth (407), the key teeth (407) are engaged with the key groove (406), and the inner cavity of the bottom plate (405) is rotatably mounted with a second rotating shaft (408).

4. The dry-wet cycle test device for sandy loess according to claim 3, characterized in that: A contact block (409) is provided at one end of the second rotating shaft (408), a mounting plate (410) is fixedly mounted on the inner wall of the base (301), a first convex ring (411) is fixedly mounted on the surface of the mounting plate (410) for driving the second rotating shaft (408) to move upward, and a gravity sensor (412) is mounted in the inner cavity of the first convex ring (411) for weighing the loess sample.

5. The dry-wet cycle test device for sandy loess according to claim 4, characterized in that: A crushing knife (413) is fixedly installed at one end of the second rotating shaft (408) for crushing the dried loess sample. A first gear (414) is fixedly installed on the surface of the second rotating shaft (408). A third rotating shaft (415) is rotatably installed in the inner cavity of the mounting plate (410). A second gear (416) is fixedly installed at one end of the third rotating shaft (415). The second gear (416) is adapted to the first gear (414). A second motor (417) is fixedly installed in the inner cavity of the base (1). The output end of the second motor (417) is fixedly connected to one end of the third rotating shaft (415).

6. The dry-wet cycle test device for sandy loess according to claim 5, characterized in that: The water supply box (401) has an inner cavity provided with a water outlet (418), and a water pipe is connected between the water outlet (418) and the nozzle (402). A limiting frame (419) is fixedly installed in the inner cavity of the water supply box (401), and a plug (420) is slidably installed in the inner cavity of the limiting frame (419) for sealing the water outlet (418).

7. The dry-wet cycle test device for sandy loess according to claim 6, characterized in that: A pull rod (421) is fixedly mounted on the surface of the plug (420), a float (422) is fixedly mounted on the surface of the pull rod (421), a first spring (423) is sleeved on the surface of the pull rod (421), one end of the first spring (423) is fixedly connected to the limit frame (419), and the other end of the first spring (423) is fixedly connected to the plug (420) for driving the plug (420) to move downward, and a plurality of drainage holes (424) are provided on the side wall of the plug (420).

8. The dry-wet cycle test device for sandy loess according to claim 7, characterized in that: A drying mechanism (5) is installed on the surface of the base (1) for drying the loess sample. The drying mechanism (5) includes a hot air blower (501) and filter holes (502). The hot air blower (501) is fixedly installed on the side wall of the frame (2) for drying the loess sample. The side wall of the sample tube (303) is provided with a plurality of filter holes (502) for drainage.

9. The dry-wet cycle test device for sandy loess according to claim 8, characterized in that: The sample tube (303) is slidably sleeved with a sealing ring (503) for sealing the filter hole (502); a mounting ring (504) is fixedly mounted on the surface of the sample tube (303); a guide rod (505) is symmetrically fixedly mounted on the bottom of the mounting ring (504); the guide rod (505) is slidably connected to the sealing ring (503); a second spring (506) is sleeved on the surface of the guide rod (505); one end of the second spring (506) is fixedly connected to the mounting ring (504); the other end of the second spring (506) is fixedly connected to the sealing ring (503) for driving the sealing ring (503) to move downward; a push rod (507) is fixedly mounted on the bottom of the sealing ring (503); a second convex ring (508) is fixedly mounted on the surface of the base (1) for driving the push rod (507) to move upward; a waste outlet (509) is provided on the side wall of the base (301) for discharging wastewater.

10. A sandy loess dry-wet cycle test method, applicable to the sandy loess dry-wet cycle test device according to claim 9, characterized in that: The steps include: S1: testing; placing the loess sample into two sample tubes (303), and placing the sample tubes (303) into the test bench (302) in turn, and driving the test bench (302) to rotate by the first motor (305), thereby switching the two sample tubes (303). When the sample tubes (303) rotate to the bottom of the bracket (306), the moisture tester (308) can be driven to descend by the telescopic rod (307) and inserted into the loess sample to detect its moisture content; S2: spraying; when the first motor (305) drives the sample tube (303) to rotate to the bottom of the nozzle (402), the second rotating shaft (408) moves from the first convex ring (411) to the surface of the gravity sensor (412), pushing the bottom plate (405) upward, lifting the loess sample in the sample tube (303), and transferring the weight of the loess sample from the second rotating shaft (408) to the surface of the gravity sensor (412), realizing the gravity detection of the loess sample, and controlling the water pumping amount of the water pump (404) according to the weight thereof, ensuring that the loess sample can be fully wetted, and when the contact block (409) moves to the surface of the gravity sensor (412), the first gear (414) is engaged with the second gear (416), and the second motor (417) is controlled to drive the third rotating shaft (415) to rotate, thereby driving the crushing knife (413) to rotate, crushing the dried loess sample, and helping the water to be more evenly distributed in the loess sample; S3: Drying; when the first motor (305) drives the sample tube (303) to rotate to the bottom of the nozzle (402), under the action of the second spring (506), the sealing ring (503) is driven to move downward to seal the filter hole (502). When the first motor (305) drives the sample tube (303) to rotate to the bottom of the hot air blower (501), the loess sample is dried by the hot air blower (501), and at this time, the second convex ring (508) drives the push rod (507) to move upward, driving the sealing ring (503) to move upward synchronously, canceling the closure of the filter hole (502), and water in the loess sample can be discharged synchronously from the filter hole (502).

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