An automated soil drying and wetting cycle test device

Abstract

The application provides an automatic soil dry-wet cycle test device, which comprises a saturation mechanism, a drying mechanism, a rotating mechanism and a data acquisition and processing mechanism. The saturation mechanism comprises a saturation cylinder, a liquid storage cylinder and a vacuum pump. A water inlet pipe and a water outlet pipe are respectively connected between the saturation cylinder and the liquid storage cylinder. The vacuum pump is connected with the saturation cylinder through a vacuum air suction pipe. The drying mechanism comprises a resistance wire, which is arranged in a sandwich space formed between the inner side wall and the outer side wall of the saturation cylinder. The rotating mechanism comprises a fixing frame, a transparent sample box in rotational cooperation with the fixing frame and a rotating driving mechanism for driving the transparent sample box to rotate. The top of the fixing frame is fixedly connected with the top of the inner side wall of the saturation cylinder through a tension sensor and an electronic scale. The data acquisition and processing mechanism comprises a detection element, a detection element and an upper computer. The automatic soil dry-wet cycle test device is suitable for dry-wet cycle and soaking test under various environmental factors and has high automation degree.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of civil engineering test equipment, in particular to an automatic soil dry-wet cycle test device. BACKGROUND

[0002] Long-term reservoir water level fluctuation and rainfall have dry-wet cycle effect and immersion effect on soil slope, which causes soil particle migration, generates voids, and further causes soil density to be low, ultimately resulting in strength reduction of the slope soil. Therefore, dry-wet cycle test and immersion test need to be performed on the soil.

[0003] At present, soil dry-wet cycle test simulates dry-wet cycle environment through water immersion-drying reciprocating process. The existing dry-wet cycle test equipment has the following deficiencies: ① For water saturation, after the water surface submerges the sample, the bubbles in the experimental sample are difficult to discharge due to the influence of the gas-liquid interface tension, resulting in insufficient saturation. ② For drying, the weight of the sample needs to be measured multiple times to check whether the sample reaches the set drying degree, which is relatively cumbersome; the measurement data is completed by manual operation, the degree of automation is low, and the error is large; the sample is unevenly heated, causing errors in subsequent test results. ③ For dry-wet cycle test, it is difficult to realize real-time tracking of solution ion concentration.

[0004] At present, soil immersion test mainly uses a conventional water tank for immersion, which has the following deficiencies: ① Each cycle needs manual operation to take out the sample, which is relatively cumbersome. ② It is difficult to realize real-time tracking of solution ion concentration.

[0005] In view of the above deficiencies of the existing test equipment, an automatic soil dry-wet cycle test device based on mass threshold control, uniform heating and real-time monitoring is developed, which can realize dry-wet alternating cycle test and immersion test on the same device. SUMMARY

[0006] The purpose of the present application is to provide an automatic soil dry-wet cycle test device, which is suitable for dry-wet cycle and immersion test under various environmental factors and has a high degree of automation.

[0007] The present application provides an automatic soil dry-wet cycle test device, which comprises:

[0008] The saturation mechanism comprises a saturation cylinder, a liquid storage cylinder and a vacuum pump, the saturation cylinder corresponds to the liquid storage cylinder one by one, and the saturation cylinder is located above the liquid storage cylinder, and a water inlet pipe and a water outlet pipe are connected between the saturation cylinder and the liquid storage cylinder respectively; the vacuum pump is connected with the saturation cylinder through a vacuum air suction pipe;

[0009] The drying mechanism comprises a resistance wire, the saturated cylinder comprises an inner side wall and an outer side wall, a sandwich space is formed between the inner side wall and the outer side wall, and the resistance wire is arranged in the sandwich space;

[0010] The rotating mechanism comprises a fixed frame, a transparent sample box in rotational cooperation with the fixed frame, and a rotating driving mechanism for driving the transparent sample box to rotate, and the top of the fixed frame is fixedly connected with the top of the inner side wall of the saturated cylinder through a tension sensor and an electronic scale respectively;

[0011] The data acquisition and processing mechanism comprises a detection element arranged in the liquid storage cylinder, a detection element arranged in the saturated cylinder, and an upper computer, and the detection element, the detection element, the vacuum pump, the resistance wire, the rotating driving mechanism, the tension sensor and the electronic scale are electrically connected with the upper computer respectively.

[0012] According to the automatic soil dry-wet cycle test device provided by the application, the saturated cylinder comprises at least one, the vacuum air exhaust pipe comprises an air exhaust main pipe and an air exhaust branch pipe, each saturated cylinder is connected with the air exhaust main pipe through the air exhaust branch pipe, and the air exhaust main pipe is connected with the vacuum pump; an air exhaust control valve is arranged on each air exhaust branch pipe;

[0013] A pressure gauge for detecting the internal air pressure of the saturated cylinder is arranged on the saturated cylinder, and an air outlet pipe is further connected with the saturated cylinder, and an air outlet control valve is arranged on the air outlet pipe;

[0014] The air exhaust control valve, the pressure gauge and the air outlet control valve are electrically connected with the upper computer respectively.

[0015] According to the automatic soil dry-wet cycle test device provided by the application, a water outlet is arranged at the bottom of the saturated cylinder, a water inlet is arranged at the top of the saturated cylinder, the water outlet and the water inlet are connected with the internal cavity of the saturated cylinder respectively, one end of the water outlet pipe is connected with the water outlet, the other end of the water outlet pipe is connected with the internal cavity of the liquid storage cylinder, one end of the water inlet pipe extends into the internal cavity of the saturated cylinder through the water inlet, and the other end of the water inlet pipe is connected with the internal cavity of the liquid storage cylinder;

[0016] A water outlet control valve is arranged on the water outlet pipe, and a water inlet control valve is arranged on the water inlet pipe, and the water outlet control valve and the water inlet control valve are electrically connected with the upper computer respectively.

[0017] The utility model provides an automatic soil dry-wet cycle test device, the fixed frame includes the top plate of horizontal arrangement and two vertical setting side plates, and the upper end of two side plates is fixedly connected with the both ends of top plate correspondingly, and the inside wall top of saturated cylinder is connected with the upper surface of top plate correspondingly through the tensile sensor and electronic scale.

[0018] The utility model provides an automatic soil dry-wet cycle test device, the rotating drive mechanism includes a transverse gear, two longitudinal gears and two drive motors, the transverse gear is fixedly installed on transverse gear shaft, and each longitudinal gear is fixedly installed on longitudinal gear shaft, the transverse gear shaft is fixedly connected with the bottom center position of transparent sample box, and two longitudinal gears are symmetrically arranged on the left and right sides of transverse gear, and each longitudinal gear is meshedly connected with transverse gear, two drive motors are installed on the left and right sides outside of saturated cylinder, and the output shaft of each drive motor is freely inserted into the internal chamber of saturated cylinder through saturated cylinder, two longitudinal gear shafts are fixedly connected with the output shaft of two drive motors correspondingly after passing through two side plates, and the gear shaft of each longitudinal gear is rotatably matched with each side plate.

[0019] The utility model provides an automatic soil dry-wet cycle test device, the transparent sample box is the cylindrical box body of open upper end, still include stabilizing mechanism, the stabilizing mechanism includes stabilizing gear ring and at least three stabilizing gears of meshing connection with stabilizing gear ring, each stabilizing gear is distributed in equidistance circle on the outside of transparent sample box, each stabilizing gear is rotatably matched with each stabilizing gear shaft, and each stabilizing gear shaft is fixedly connected with the outside wall of transparent sample box, the stabilizing gear ring is located at the periphery of transparent sample box, two side plates are arranged on the opposite sides of stabilizing gear ring, and the inside of each side plate is fixedly connected with the outside of stabilizing gear ring.

[0020] The utility model provides an automatic soil dry-wet cycle test device, two half circular box covers are equipped on the top of transparent sample box, each half circular box cover is rotatably connected with transparent sample box, and electric lock is arranged between half circular box cover, and electric lock is electrically connected with upper computer.

[0021] The automatic soil dry-wet cycle test device provided by the application further comprises an uncovering mechanism arranged above the transparent sample box, the uncovering mechanism comprises an electric telescopic rod, a rotating disc and two symmetrically arranged connecting rods, the fixed end of the electric telescopic rod is fixedly connected with the lower surface of the top plate, and the telescopic end of the electric telescopic rod is rotationally connected with the upper surface of the rotating disc; the upper ends of the two connecting rods are respectively hingedly connected with the opposite sides of the rotating disc, and the lower ends of the two connecting rods are respectively hingedly connected with the two semicircular box covers; and the electric telescopic rod is electrically connected with the upper computer.

[0022] The automatic soil dry-wet cycle test device provided by the application further comprises an uncovering mechanism arranged above the transparent sample box, the uncovering mechanism comprises an electric telescopic rod, a rotating disc and two symmetrically arranged connecting rods, the fixed end of the electric telescopic rod is fixedly connected with the lower surface of the top plate, and the telescopic end of the electric telescopic rod is rotationally connected with the upper surface of the rotating disc; the upper ends of the two connecting rods are respectively hingedly connected with the opposite sides of the rotating disc, and the lower ends of the two connecting rods are respectively hingedly connected with the two semicircular box covers; and the electric telescopic rod is electrically connected with the upper computer.

[0023] The automatic soil dry-wet cycle test device provided by the application further comprises an uncovering mechanism arranged above the transparent sample box, the uncovering mechanism comprises an electric telescopic rod, a rotating disc and two symmetrically arranged connecting rods, the fixed end of the electric telescopic rod is fixedly connected with the lower surface of the top plate, and the telescopic end of the electric telescopic rod is rotationally connected with the upper surface of the rotating disc; the upper ends of the two connecting rods are respectively hingedly connected with the opposite sides of the rotating disc, and the lower ends of the two connecting rods are respectively hingedly connected with the two semicircular box covers; and the electric telescopic rod is electrically connected with the upper computer.

[0024] The automatic soil dry-wet cycle test device provided by the application further comprises an uncovering mechanism arranged above the transparent sample box, the uncovering mechanism comprises an electric telescopic rod, a rotating disc and two symmetrically arranged connecting rods, the fixed end of the electric telescopic rod is fixedly connected with the lower surface of the top plate, and the telescopic end of the electric telescopic rod is rotationally connected with the upper surface of the rotating disc; the upper ends of the two connecting rods are respectively hingedly connected with the opposite sides of the rotating disc, and the lower ends of the two connecting rods are respectively hingedly connected with the two semicircular box covers; and the electric telescopic rod is electrically connected with the upper computer.

[0025] The automatic soil dry-wet cycle test device provided by the application comprises a saturation mechanism, a drying mechanism, a rotating mechanism and a data acquisition and processing mechanism, wherein the saturation mechanism comprises a saturation cylinder, a liquid storage cylinder and a vacuum pump, the saturation cylinder is in one-to-one correspondence with the liquid storage cylinder, the saturation cylinder is located above the liquid storage cylinder, and a water inlet pipe and a water outlet pipe are respectively connected between the saturation cylinder and the liquid storage cylinder; the vacuum pump is connected with the saturation cylinder through a vacuum air suction pipe; the drying mechanism comprises a resistance wire, the saturation cylinder comprises an inner side wall and an outer side wall, a sandwiched space is formed between the inner side wall and the outer side wall, and the resistance wire is arranged in the sandwiched space; the rotating mechanism comprises a fixed frame, a transparent sample box in rotational cooperation with the fixed frame and a rotating driving mechanism for driving the transparent sample box to rotate, the top of the fixed frame is fixedly connected with the top of the inner side wall of the saturation cylinder through a tension sensor and an electronic scale; the data acquisition and processing mechanism comprises a detection element arranged in the liquid storage cylinder, a detection element arranged in the saturation cylinder and an upper computer, and the detection elements, the vacuum pump, the resistance wire, the rotating driving mechanism, the tension sensor and the electronic scale are electrically connected with the upper computer. In use, the saturation cylinder can be vacuumized by the vacuum pump, the transparent sample box is used to place a test sample, the water inlet pipe is used to deliver soaking solution into the saturation cylinder, and the water outlet pipe is used to deliver the soaking solution in the saturation cylinder into the liquid storage cylinder; the saturation cylinder can be dried by the drying mechanism, and the transparent sample box can be driven to rotate in the saturation cylinder by the rotating driving mechanism, so that the test sample in the transparent sample box is uniformly heated and dried; the test sample can be weighed by the fixed frame and the tension sensor and the electronic scale, and mass threshold control is realized; the detection data of the solution in the liquid storage cylinder can be acquired by the detection element, the ion concentration of the solution is tracked in real time, the detection data in the saturation cylinder can be acquired by the detection element, the acquired detection data can be received and processed by the upper computer, real-time monitoring is realized, and the working states of the saturation mechanism, the drying mechanism and the rotating mechanism can be controlled by the upper computer, and automatic control of the test process is realized. Therefore, the automatic soil dry-wet cycle test device provided by the application is suitable for dry-wet cycle and soaking tests under various environmental factors, and has high automation.

[0026] Further, the automatic soil dry-wet cycle test device provided by the application integrates various functions such as dry-wet cycle, weighing, drying and the like, so that the saturation and drying degree can be accurately controlled, and the intelligent degree is higher.

[0027] Further, the automatic soil dry-wet cycle test device provided by the application can realize automatic opening and closing control of the two semicircular box covers on the top of the transparent sample box through the setting of the cover opening mechanism, which not only protects the test sample from deformation and decomposition during the saturation process, but also facilitates the recording of the cracking and shrinkage surface of the test sample with the dry-wet cycle number by the camera during the drying process.

[0028] Further, the automatic soil dry-wet cycle test device provided by the application can solve the problem that the test sample is easily disturbed by external factors and the test result cannot be fed back in time after the dry-wet cycle and soaking of the test sample.

[0029] Further, the automatic soil dry-wet cycle test device provided by the application can record a plurality of data such as soil body cracking and shrinkage under dry-wet cycle, sample moisture content change curve, ion concentration in soaking liquid and the like in real time through a plurality of sensing devices such as a detection element, a detection element, a tension sensor and an electronic scale, an ion detection sensor and the like.

[0030] Further, the automatic soil dry-wet cycle test device provided by the application can extract air in the pores of the sample soil body by using the negative pressure vacuum method, so as to not only improve the saturation speed, but also make the saturation more uniform.

[0031] Further, the automatic soil dry-wet cycle test device provided by the application uses the vacuum pumping function of the vacuum pump, so as to not only realize dynamic circulation of various chemical solutions in the water inlet pipe, the water outlet pipe, the saturation cylinder and the liquid storage cylinder, but also realize real-time tracking of the change of the ion concentration in the solution.

[0032] Further, the automatic soil dry-wet cycle test device provided by the application uses the upper computer to realize automatic test control, so as to not only improve the accuracy, but also greatly reduce the test labor and time cost, and the experimental process is more intuitive and simple.

[0033] Further, the automatic soil dry-wet cycle test device provided by the application solves the problem of low test automation degree and inconvenient operation of the prior art in which different devices with single functions are mechanically combined for dry-wet alternating cycle test and soaking treatment, and the application is a multifunctional automatic soil dry-wet cycle test device based on quality threshold control, uniform heating and real-time monitoring, which can complete the dry-wet alternating cycle test and the soaking test on the same device. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the drawings needed in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0035] Figure 1 It is a structural schematic view of the automatic soil dry-wet cycle test device of the application.

[0036] Figure 2 Another structural schematic diagram of the automatic soil dry-wet cycle test device of the present application;

[0037] Figure 3 A cover opening state schematic diagram of the transparent sample box in the automatic soil dry-wet cycle test device of the present application;

[0038] Figure 4 A structural schematic diagram of the rotary driving mechanism in the automatic soil dry-wet cycle test device of the present application;

[0039] Figure 5 A structural schematic diagram of the stabilizing mechanism in the automatic soil dry-wet cycle test device of the present application.

[0040] Explanation of reference signs:

[0041] 1, saturated cylinder; 2, liquid storage cylinder; 3, vacuum pump; 4, water inlet pipe; 5, water outlet pipe; 6, resistance wire; 7, fixing frame; 701, top plate; 702, side plate; 8, transparent sample box; 81, semicircular box cover; 9, tension sensor; 10, electronic scale; 11, electric fan; 12, vacuum air extraction pipe; 121, air extraction main pipe; 122, air extraction branch pipe; 13, air extraction control valve; 14, pressure gauge; 15, air outlet pipe; 16, air outlet control valve; 17, water outlet control valve; 18, water inlet control valve; 19, transverse gear; 20, longitudinal gear; 21, driving motor; 22, transverse gear shaft; 23, longitudinal gear shaft; 24, stabilizing gear ring; 25, stabilizing gear; 26, stabilizing gear shaft; 27, electric telescopic rod; 28, rotary disc; 29, connecting rod; 30, ion composite electrode probe; 31, camera; 32, temperature sensor. DETAILED DESCRIPTION

[0042] The technical solutions of the present application will be described below in conjunction with the embodiments, obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0043] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0044] Moreover, the terms "first", "second", etc. are used herein for descriptive purposes only and cannot be construed as indicating or implying relative importance or an indicated number of technical features. Thus, features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited. In addition, the terms "mounting", "connecting", "connection" should be broadly understood, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] As shown in Figures 1 to 5 The automatic soil dry-wet cycle test device of the embodiment of the present application comprises a saturation mechanism, a drying mechanism, a rotating mechanism and a data acquisition and processing mechanism.

[0046] The saturation mechanism comprises a saturation cylinder 1, a liquid storage cylinder 2 and a vacuum pump 3. The saturation cylinder 1 corresponds to the liquid storage cylinder 2 one by one, and the saturation cylinder 1 is located above the liquid storage cylinder 2. A water inlet pipe 4 and a water outlet pipe 5 are respectively connected between the saturation cylinder 1 and the liquid storage cylinder 2. The vacuum pump 3 is connected to the saturation cylinder 1 through a vacuum air suction pipe.

[0047] The drying mechanism comprises a resistance wire 6. The saturation cylinder 1 comprises an inner side wall and an outer side wall, and a sandwiched space is formed between the inner side wall and the outer side wall. The resistance wire 6 is arranged in the sandwiched space.

[0048] The rotating mechanism comprises a fixed frame 7, a transparent sample box 8 which is rotationally matched with the fixed frame 7, and a rotating driving mechanism which drives the transparent sample box 8 to rotate. The top of the fixed frame 7 is fixedly connected with the top of the inner side wall of the saturation cylinder 1 through a tension sensor 9 and an electronic scale 10 respectively.

[0049] The data acquisition and processing mechanism comprises a detection element arranged in the liquid storage cylinder 2, a detection element arranged in the saturation cylinder 1, and an upper computer (not shown in the figure). The detection element, the detection element, the vacuum pump 3, the resistance wire 6, the rotating driving mechanism, the tension sensor 9 and the electronic scale 10 are electrically connected with the upper computer respectively.

[0050] When the test is carried out, the saturated cylinder 1 can be vacuumized by the vacuum pump 3, the transparent sample box 8 is used to place the test sample, the water inlet pipe 4 is used to deliver the soaking solution into the saturated cylinder 1, the water outlet pipe 5 is used to deliver the soaking solution in the saturated cylinder 1 into the liquid storage cylinder 2, the drying mechanism can be used to dry the inside of the saturated cylinder, the rotating driving mechanism can drive the transparent sample box 8 to rotate in the saturated cylinder 1, so that the test sample in the transparent sample box 8 can be uniformly dried, the test sample can be weighed by the setting of the fixing frame 7, the tension sensor 9 and the electronic scale 10, the detection data in the liquid storage cylinder 2 can be collected by the detection element, the detection data in the saturated cylinder 1 can be collected by the detection element, the collected detection data can be received and data processing and analysis can be carried out by the upper computer, and the working state of the saturated mechanism, the drying mechanism and the rotating mechanism can be controlled by the upper computer.

[0051] Therefore, the automatic soil dry-wet cycle test device can simulate the dry-wet cycle test and the soaking test under dynamic pressure, is suitable for the dry-wet cycle and the soaking test in various water soaking environments, and has high automation.

[0052] Specifically, the saturated cylinder 1, the liquid storage cylinder 2, the transparent sample box 8 and the fixing frame 7 are made of corrosion-resistant organic glass material, which can be suitable for various chemical reagent soaking and can also be used for tests under different temperatures and chemical conditions.

[0053] Specifically, the saturated cylinder 1 has an openable and closable cylinder cover, which is convenient for loading the transparent sample box 8 into the saturated cylinder 1 for test.

[0054] Specifically, the transparent sample box 8 is provided with micron-sized small holes on the periphery, and filter paper is pasted on the inner side wall of the transparent sample box 8, so that the test sample in the transparent sample box 8 can be fully soaked.

[0055] Specifically, the electric fan 11 can also be installed on the fixing frame 7, and the electric fan 11 is electrically connected with the upper computer. The working state of the electric fan 11 can be controlled by the upper computer, and the drying efficiency is higher when the test sample in the transparent sample box 8 is dried.

[0056] In some embodiments of the present application, according to actual use requirements, the saturated cylinder 1 can be provided with one or more, and the corresponding liquid storage cylinder 2 is also provided with one or more.

[0057] As shown in Figure 1 When the saturated cylinder 1 is provided with one, the vacuum pump 3 is connected with the inside chamber of the saturated cylinder 1 through the vacuum air exhaust pipe 12. The air exhaust control valve 13 is arranged on the vacuum air exhaust pipe 12, which is used to control the vacuumization of the saturated cylinder 1.

[0058] As Figure 2 shown, when the saturated cylinder 1 is provided with multiple, the vacuum exhaust pipe includes an exhaust main pipe 121 and an exhaust branch pipe 122, each saturated cylinder 1 is connected with the exhaust main pipe 121 through the exhaust branch pipe 122, and the exhaust main pipe 121 is connected with the vacuum pump 3. Among them, the exhaust control valve 13 is arranged on each exhaust branch pipe 122 respectively, for controlling the vacuumization of each saturated cylinder 1.

[0059] Among them, the pressure gauge 14 for detecting the internal air pressure of the saturated cylinder 1 is also arranged on the saturated cylinder 1, for implementing the acquisition of the internal pressure data of the saturated cylinder 1.

[0060] Among them, the exhaust pipe 15 is also connected with the saturated cylinder 1, and the exhaust control valve 16 is arranged on the exhaust pipe 15, for regulating the air pressure of the saturated cylinder 1.

[0061] Among them, the exhaust control valve 13, the pressure gauge 14 and the exhaust control valve 16 are electrically connected with the upper computer respectively, the working states of the exhaust control valve 13 and the exhaust control valve 16 can be controlled through the upper computer respectively, and the pressure detection data of the pressure gauge 14 can be collected through the upper computer.

[0062] In some embodiments of the present application, the water outlet is arranged at the bottom of the saturated cylinder 1, the water inlet is arranged at the top of the saturated cylinder 1, and the water outlet and the water inlet are respectively connected with the internal chamber of the saturated cylinder 1. One end of the water outlet pipe 5 is connected with the water outlet, and the other end of the water outlet pipe 5 is connected with the internal chamber of the liquid storage cylinder 2. One end of the water inlet pipe 4 extends into the internal chamber of the saturated cylinder 1 through the water inlet, and the other end of the water inlet pipe 4 is connected with the internal chamber of the liquid storage cylinder 2. In the vacuum state, the saturated cylinder 1 can transport the soaking solution in the liquid storage cylinder 2 into the saturated cylinder 1, so as to fully soak the test sample in the transparent sample box 8. When the internal chamber of the saturated cylinder 1 is in the normal pressure state, the soaking solution in the saturated cylinder 1 can be discharged into the liquid storage cylinder 2.

[0063] Among them, the water outlet control valve 17 is arranged on the water outlet pipe 5, and the water inlet control valve 18 is arranged on the water inlet pipe 4, and the water outlet control valve 17 and the water inlet control valve 18 are electrically connected with the upper computer respectively. The working states of the water outlet control valve 17 and the water inlet control valve 18 can be controlled through the upper computer respectively.

[0064] Specifically, the water outlet pipe 5 and the water inlet pipe 4 are made of corrosion-resistant materials to prevent corrosion damage of the soaking solution.

[0065] In some embodiments of the present application, the fixing frame 7 comprises a horizontal top plate 701 and two vertical side plates 702, the upper ends of the two side plates 702 are respectively fixedly connected with the two ends of the top plate 701. The inner side wall top of the saturated cylinder 1 is respectively connected with the upper surface of the top plate 701 through the tension sensor 9 and the electronic scale 10. The structure of the fixing frame 7 facilitates the rotational assembly of the transparent sample box 8 on the fixing frame 7, so that the transparent sample box 8 is more stable and reliable after rotation, and the test sample in the transparent sample box 8 can be weighed conveniently.

[0066] In some embodiments of the present application, the rotating drive mechanism comprises a transverse gear 19, two longitudinal gears 20 and two drive motors 21, the transverse gear 19 is fixedly installed on a transverse gear shaft 22, and each longitudinal gear 20 is fixedly installed on a longitudinal gear shaft 23. The transverse gear shaft 22 is fixedly connected with the bottom center position of the transparent sample box 8, the two longitudinal gears 20 are symmetrically arranged on the left and right sides of the transverse gear 19, and each longitudinal gear 20 is meshingly connected with the transverse gear 19. The two drive motors 21 are respectively installed on the left and right sides of the outside of the saturated cylinder 1, and the output shafts of each drive motor 21 respectively freely pass through the saturated cylinder 1 and extend into the internal chamber of the saturated cylinder 1. The two longitudinal gear shafts 23 are respectively fixedly connected with the output shafts of the two drive motors 21 after passing through the two side plates 702, and each longitudinal gear shaft 23 is rotationally matched with each side plate 702. That is, each drive motor 21 can drive each longitudinal gear 20 to rotate, then drive the transverse gear 19 to rotate under the meshing action of the longitudinal gear 20 and the transverse gear 19, and then transmit the rotating driving force to the transparent sample box 8 to drive the transparent sample box 8 to rotate.

[0067] Specifically, the transparent sample box 8 is a cylindrical box body with an open upper end.

[0068] The automatic soil dry-wet cycle test device further comprises a stabilizing mechanism, the stabilizing mechanism comprises a stabilizing gear ring 24 and at least three stabilizing gears 25 meshingly connected with the stabilizing gear ring 24, each stabilizing gear 25 is equidistantly circumferentially distributed outside the transparent sample box 8, each stabilizing gear 25 is rotationally matched with a stabilizing gear shaft 26, and each stabilizing gear shaft 26 is fixedly connected with the outer side wall of the transparent sample box 8. The stabilizing gear ring 24 is located at the periphery of the transparent sample box 8, the stabilizing gear ring 24 is located at the middle position of the transparent sample box 8, the two side plates 702 are respectively arranged on the opposite sides of the stabilizing gear ring 24, and the inner sides of each side plate 702 are respectively fixedly connected with the outer sides of the stabilizing gear ring 24. That is, when the transparent sample box 8 rotates, each stabilizing gear 25 can meshingly roll along the stabilizing gear ring 24, so that the rotating movement of the transparent sample box 8 is more stable and reliable.

[0069] In some embodiments of the present application, two matched semicircular box covers 81 are arranged on the top of the transparent sample box 8, and each semicircular box cover 81 is reversely connected with the transparent sample box 8. By reversely or oppositely turning the two semicircular box covers 81, the opening and closing of the transparent sample box 8 can be realized.

[0070] In addition, an electric lock (not shown in the figure) can be arranged between the two semicircular box covers 81, and the electric lock is electrically connected with the upper computer. That is, the opening and closing state of the electric lock can be controlled by the upper computer. When the transparent sample box 8 needs to be opened, the electric lock is first controlled to be opened, and then the two semicircular box covers 81 are reversely turned to be opened. When the two semicircular box covers 81 are closed, the electric lock can be controlled to be closed, so as to realize the reliable locking of the transparent sample box 8.

[0071] In addition, the electric lock can adopt an existing structure.

[0072] In some embodiments of the present application, the automatic soil dry-wet cycle test device further comprises an opening mechanism arranged above the transparent sample box 8, and the opening mechanism comprises an electric telescopic rod 27, a rotating disc 28 and two symmetrically arranged connecting rods 29. The fixed end of the electric telescopic rod 27 is fixedly connected with the lower surface of the top plate 701, and the telescopic end of the electric telescopic rod 27 is rotatably connected with the upper surface of the rotating disc 28. The upper ends of the two connecting rods 29 are respectively hingedly connected with the opposite sides of the rotating disc 28, and the lower ends of the two connecting rods 29 are respectively hingedly connected with the corresponding semicircular box covers 81. In addition, the electric telescopic rod 27 is electrically connected with the upper computer, and the telescopic state of the electric telescopic rod 27 can be controlled by the upper computer. That is, by arranging the opening mechanism, the automatic opening and closing of the two semicircular box covers 81 can be realized.

[0073] When the two semicircular box covers 81 need to be opened, the locking state of the electric lock is first released, and then the electric telescopic rod 27 is controlled to be upwardly contracted, so as to drive the rotating disc 28 to move upwardly. Under the pulling force of the rotating disc 28, the two connecting rods 29 drive the two semicircular box covers 81 to reversely turn upwardly, so that the upper opening of the transparent sample box 8 is opened, and the sample in the transparent sample box 8 can be observed.

[0074] Conversely, when the two semicircular box covers 81 need to be closed, the electric telescopic rod 27 is controlled to be downwardly elongated, so as to drive the rotating disc 28 to move downwardly. Under the pushing force of the rotating disc 28, the two connecting rods 29 drive the two semicircular box covers 81 to oppositely turn downwardly, so that the upper opening of the transparent sample box 8 is closed, and then the electric lock is controlled to be locked.

[0075] In some embodiments of the present application, the detection element includes an ion complex electrode probe 30 arranged in the liquid storage cylinder 2. The detection element includes a camera 31 arranged on the lower surface of the rotating disc 28 and a temperature sensor 32 arranged on the fixed frame 7. The ion complex electrode probe 30 can detect the ion species and concentration of the soaking solution discharged into the liquid storage cylinder 2, and can realize dynamic detection tracking of the soaking solution.

[0076] The ion complex electrode probe 30, the camera 31 and the temperature sensor 32 are respectively electrically connected to the upper computer. The upper computer can receive the collected detection data and perform data processing and analysis.

[0077] The process of the dry-wet cycle test using the automatic dry-wet cycle test device of the embodiments of the present application is as follows:

[0078] According to the state of the sample, the sample is processed by pressure sampling method or sample cutting method, and the processed sample is placed in the transparent sample box 8, and then the cylinder cover of the saturation cylinder 1 is sealed and closed. Different batches of samples under dry-wet cycle can be placed in the transparent sample box 8 in each saturation cylinder 1 to speed up the test progress.

[0079] The water outlet control valve 17 and the water inlet control valve 18 are closed, the air extraction control valve 13 is opened, and the vacuum pump 3 is started to extract the gas in each saturation cylinder 1 and the gas in the sample of each transparent sample box 8. When the pressure gauge 14 detects that the pressure is close to-100kPa, the air extraction continues. The air extraction time of the clayey soil sample is about 3h, and the air extraction time of the silty soil sample is about 2.5h.

[0080] Since different batches of soil samples are placed in different saturation cylinders 1, the vacuum pump 3 and the air extraction control valve 13 are closed, and the water inlet control valve 18 is opened, so that the samples in each saturation cylinder 1 are in a saturated state. The number of dry-wet cycles, the target water content and other parameters are input into the upper computer. The upper computer automatically calculates the weight threshold value according to the parameters.

[0081] After the saturation of the sample is completed, the water inlet control valve 18 is closed, the water outlet control valve 17 is opened, the solution in each saturation cylinder 1 is discharged into the corresponding liquid storage cylinder 2, and then the electric lock is opened by controlling the electric lock, the two half-circular covers 81 of the transparent sample box 8 are opened by controlling the cover opening mechanism, and then the two drive motors 21 are started to drive the transparent sample box 8 to rotate in the saturation cylinder 1, and the electric resistance wire 6 and the electric fan 11 are turned on to dry the transparent sample box 8.

[0082] The data collected by the tension sensor 9 and the electronic scale 10 are fed back to the upper computer in real time, and when the detection data reaches the weight threshold value, that is, the sample reaches the target water content, the electric resistance wire 6 and the electric fan 11 are turned off, and the drive motor 21 is controlled to be turned off.

[0083] In this process, the ion concentration in the soaking solution can be detected by the ion complex electrode probe 30, and the detection data can be fed back to the upper computer in real time to realize real-time detection and processing of the ion concentration in the soaking solution during the dry-wet cycle. The cracking and deformation of the sample can be monitored by the camera 31, and the collected image information can be fed back to the upper computer in real time. The temperature information near the transparent sample box 8 of the sample can be collected by the temperature sensor 32, and the detection data can be fed back to the upper computer in real time.

[0084] The data collection work is completed within the set dry-wet cycle and sampling interval, and is fed back to the upper computer in time. After the set dry-wet cycle is completed, the upper computer controls the test device to stop running, and the dry-wet cycle test is completed.

[0085] The process of the automatic soil dry-wet cycle test device of the embodiment of the application for soaking test is as follows:

[0086] According to the sample state, the sample is processed by pressure sampling method or sample cutting method, and the processed sample is placed in the transparent sample box 8, and then the cylinder cover of the saturation cylinder 1 is sealed and closed. Different batches of samples soaked in each saturation cylinder 1 can be placed to speed up the test progress.

[0087] The water outlet control valve 17 and the water inlet control valve 18 are closed, the air extraction control valve 13 is opened, and the vacuum pump 3 is started to extract the gas in each saturation cylinder 1 and the gas in the sample of each transparent sample box 8. When the pressure gauge 14 detects that the pressure is close to-100kPa, the air extraction continues. The air extraction time of the clay sample is about 3h, and the air extraction time of the silty soil sample is about 2.5h.

[0088] Since different batches of soil samples are placed in different saturation cylinders 1 subjected to vacuum extraction, the vacuum pump 3 and the air extraction control valve 13 are closed, and the water inlet control valve 18 is opened, so that the samples in each saturation cylinder 1 are in a saturated state. At this time, the upper computer automatically starts recording the soaking time.

[0089] After soaking is completed, the upper computer automatically prompts. The water inlet control valve 18 is closed, and the water outlet control valve 17 is opened, so that the soaking solution in each saturation cylinder 1 is discharged into the corresponding liquid storage cylinder 2. Then the ion concentration of the soaking solution in the liquid storage cylinder 2 is detected by the ion complex electrode probe 30, and the detection data is fed back to the upper computer in real time to realize real-time detection and processing of the ion concentration of the soaking solution during the soaking process.

[0090] The data collection work is completed within the set dry-wet cycle and sampling interval, and is fed back to the upper computer in time. After the set dry-wet cycle is completed, the upper computer controls the test device to stop running, and the dry-wet cycle test is completed.

[0091] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An automated soil drying and wetting cycle test apparatus, characterized by, The utility model relates to a kind of saturated mechanism, drying mechanism, rotating mechanism and data acquisition processing mechanism, including saturated cylinder, liquid storage cylinder and vacuum pump, the saturated cylinder is one-to-one with the liquid storage cylinder, and the saturated cylinder is located above the liquid storage cylinder, and water inlet pipe and water outlet pipe are respectively connected between the saturated cylinder and the liquid storage cylinder;The vacuum pump is connected with the saturated cylinder by vacuum air exhaust pipe; The drying mechanism includes resistance wire, the saturated cylinder includes inner side wall and outer side wall, the inner side wall and the outer side wall form a sandwich space, and the resistance wire is arranged in the sandwich space; The rotating mechanism includes fixed frame, transparent sample box and rotating drive mechanism, the fixed frame is fixedly connected with the inner side wall top of the saturated cylinder through tension sensor and electronic scale respectively, and the transparent sample box is rotatably connected with the fixed frame; The data acquisition processing mechanism includes detection element arranged in the liquid storage cylinder, detection element arranged in the saturated cylinder and upper computer, and the detection element, the detection element, the vacuum pump, the resistance wire, the rotating drive mechanism, the tension sensor and the electronic scale are electrically connected with the upper computer respectively; The fixed frame includes horizontally arranged top plate and two vertically arranged side plates, the upper ends of the two side plates are fixedly connected with the two ends of the top plate respectively, and the inner side wall top of the saturated cylinder is connected with the upper surface of the top plate through the tension sensor and the electronic scale respectively; The rotating drive mechanism includes a horizontal gear, two longitudinal gears and two drive motors, the horizontal gear is fixedly installed on a horizontal gear shaft, and each longitudinal gear is fixedly installed on a longitudinal gear shaft;The horizontal gear shaft is fixedly connected with the bottom center position of the transparent sample box, the two longitudinal gears are symmetrically arranged on the left and right sides of the horizontal gear, and each longitudinal gear is meshingly connected with the horizontal gear;Two drive motors are respectively installed on the left and right outer sides of the saturated cylinder, and the output shafts of each drive motor respectively freely pass through the saturated cylinder and extend into the internal chamber of the saturated cylinder;Two longitudinal gear shafts are fixedly connected with the output shafts of two drive motors after passing through two side plates respectively, and the gear shafts of each longitudinal gear are rotatably connected with each side plate respectively; The transparent sample box is a cylindrical box body with an open top, and two matching semicircular box covers are arranged on the top of the transparent sample box, and each semicircular box cover is rotatably connected with the transparent sample box; The cover opening mechanism includes an electric telescopic rod, a rotating disc and two symmetrically arranged connecting rods, the fixed end of the electric telescopic rod is fixedly connected with the lower surface of the top plate, and the telescopic end of the electric telescopic rod is rotatably connected with the upper surface of the rotating disc;The upper ends of the two connecting rods are respectively hingedly connected with the opposite sides of the rotating disc, and the lower ends of the two connecting rods are respectively hingedly connected with the two semicircular box covers;The electric telescopic rod is electrically connected with the upper computer. ​ The transparent sample box is provided with micron-sized holes on the whole body, and filter paper is pasted on the inner side wall of the transparent sample box.

2. The automated soil drying and wetting cycle test apparatus of claim 1, wherein, The saturated cylinder comprises at least one, the vacuum exhaust pipe comprises an exhaust main pipe and an exhaust branch pipe, each saturated cylinder is connected with the exhaust main pipe through the exhaust branch pipe, and the exhaust main pipe is connected with the vacuum pump; an exhaust control valve is arranged on each exhaust branch pipe; A pressure gauge for detecting the internal air pressure of the saturated cylinder is arranged on the saturated cylinder; an air outlet pipe is further connected to the saturated cylinder, and an air outlet control valve is arranged on the air outlet pipe; The exhaust control valve, the pressure gauge and the air outlet control valve are electrically connected with the upper computer.

3. The automated soil drying and wetting cycle test apparatus of claim 1, wherein, A water outlet is arranged at the bottom of the saturated cylinder, and a water inlet is arranged at the top of the saturated cylinder; the water outlet and the water inlet are respectively connected with the internal cavity of the saturated cylinder; one end of the water outlet pipe is connected with the water outlet, and the other end of the water outlet pipe is connected with the internal cavity of the liquid storage cylinder; one end of the water inlet pipe extends into the internal cavity of the saturated cylinder through the water inlet, and the other end of the water inlet pipe is connected with the internal cavity of the liquid storage cylinder; A water outlet control valve is arranged on the water outlet pipe, and a water inlet control valve is arranged on the water inlet pipe; the water outlet control valve and the water inlet control valve are electrically connected with the upper computer.

4. The automated soil drying and wetting cycle test apparatus of claim 1, wherein, The stabilizing mechanism comprises a stabilizing gear ring and at least three stabilizing gears meshed with the stabilizing gear ring; the stabilizing gears are equidistantly and circumferentially distributed outside the transparent sample box; each stabilizing gear is rotatably connected with a corresponding stabilizing gear shaft, and each stabilizing gear shaft is fixedly connected with the outer side wall of the transparent sample box; the stabilizing gear ring is located at the periphery of the transparent sample box, and two side plates are arranged at opposite sides of the stabilizing gear ring; the inner side of each side plate is fixedly connected with the outer side of the stabilizing gear ring.

5. The automated soil drying and wetting cycle test apparatus of claim 4, wherein, An electric lock is arranged between the semicircular covers, and the electric lock is electrically connected with the upper computer.

6. The automated soil drying and wetting cycle test apparatus of claim 1, wherein, The detection element comprises an ion complexing electrode probe arranged in the liquid storage cylinder; the detection element comprises a camera arranged on the lower surface of the rotating disc and a temperature sensor arranged on the fixing frame; the ion complexing electrode probe, the camera and the temperature sensor are electrically connected with the upper computer.

7. The automated soil drying-wetting cycle test apparatus according to any one of claims 1 to 6, characterized by, An electric fan is further arranged on the fixing frame, and the electric fan is electrically connected with the upper computer.

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