Multi-channel self-test device and test method for premixed flow-state solidified soil

Abstract

The invention relates to the technical field of civil engineering material performance testing, and discloses a premixed flow state solidified soil multi-channel self-testing device which comprises a box body used for heat preservation, a plurality of containing cavities are formed in the inner wall of the box body, bearing plates are fixedly connected to the bottoms of the inner walls of the containing cavities, trays are placed at the upper ends of the bearing plates, and the trays are arranged on the inner walls of the containing cavities. According to the device, through the multi-channel detection design, the experiment efficiency is improved, a plurality of test pieces can be synchronously tested, the regulation and control assembly can truly simulate complex working conditions, then the test reliability is improved, the stable positioning of the test pieces in the test process is guaranteed through the synergistic effect of the fixing assembly and the limiting assembly, and the test efficiency is improved. And the detachable design of the tray makes the test piece installation and subsequent cleaning and maintenance more convenient, effectively prevents residues from affecting the measurement precision, and significantly improves the efficiency of experiment preparation and the sustainable usability of the device.

Description

Technical Field

[0001] This invention relates to the field of civil engineering material performance testing technology, specifically to a multi-channel self-testing device for premixed fluidized solidified soil. Background Technology

[0002] Premixed fluidized bed soil, an environmentally friendly fluidized bed material produced through industrial premixing of soil, solidifying agent, water, and admixtures, has been widely used in roadbed backfilling, foundation pit backfilling, and other engineering projects. Drying shrinkage is one of its key performance indicators; excessive shrinkage can easily lead to cracking, seriously affecting the long-term durability and safety of the project. Therefore, accurate and efficient determination of its drying shrinkage performance is of great significance for material proportion optimization and engineering quality control.

[0003] Currently, the drying shrinkage test of this type of material mainly refers to the standard method for cement concrete, using contact displacement sensors such as dial gauges to manually measure a single specimen under constant temperature and humidity conditions. This method has the following prominent problems in practical applications: First, the testing efficiency is low, as only one specimen can be tested at a time, which cannot meet the needs of parallel testing of multiple mix proportions for premixed fluidized solidified soil, severely restricting the process of material proportion optimization and quality assessment. Second, it relies on manual reading and recording, which is not only cumbersome and labor-intensive but also prone to subjective errors, and cannot achieve continuous monitoring around the clock, making it difficult to fully capture the changes in the entire material shrinkage process. Third, the environmental simulation capability is insufficient, only providing constant temperature and humidity conditions, unable to reproduce complex working conditions such as alternating temperature and humidity and wind effects in actual engineering, leading to significant deviations between test results and actual service performance. Fourth, the contact measurement method can cause contact stress interference in solidified soil specimens with low strength, affecting the accuracy and reliability of deformation data. Therefore, we propose a multi-channel self-testing device and method for premixed fluidized solidified soil. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-channel self-testing device for premixed fluidized solidified soil to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a multi-channel self-testing device for premixed fluidized solidified soil, comprising a box for heat preservation, wherein the inner wall of the box is provided with multiple placement cavities, the bottom of the inner wall of each of the multiple placement cavities is fixedly connected to a bearing plate, a tray is placed on the upper end of each of the multiple bearing plates, each tray has a groove at its lower end, the multiple grooves respectively match the multiple bearing plates, three placement discs are placed on the upper end of each of the multiple trays, a fixing component for pressing down the tray is installed on both sides of each placement cavity, a limiting component for squeezing and fixing the tray is installed inside the multiple bearing plates, and a control component for simulating the testing environment is installed inside the box.

[0006] Preferably, the fixing component includes a lifting groove and a rack. The lifting groove is located on the lower part of the inner wall of the placement cavity. The rack is fixedly connected to one side of the tray. A one-way screw is rotatably connected to the inner wall of the lifting groove.

[0007] Preferably, a lifting frame is slidably connected to the inner wall of the lifting groove, the one-way screw passes through the lifting frame, and the lifting frame and the one-way screw are externally threaded together. A spur gear is fixedly sleeved on the lower part of the one-way screw, and the spur gear and the rack mesh with each other. Pressure plates are fixedly connected to both sides of the lower end of the lifting frame.

[0008] Preferably, the limiting component includes a rotating cavity, two sliding grooves and two limiting grooves. The rotating cavity is located in the middle of the support plate, the two sliding grooves are symmetrically located on both sides of the support plate, and the two limiting grooves are symmetrically located on the inner walls of both sides of the groove.

[0009] Preferably, a bidirectional screw is rotatably connected to the inner wall of the rotating cavity. The two ends of the bidirectional screw pass through the inner walls of both sides of the rotating cavity, and the two ends of the bidirectional screw are rotatably disposed in two sliding grooves. Limiting plates are slidably connected in both sliding grooves. The two limiting plates are respectively engaged with the two limiting grooves. The two ends of the bidirectional screw are respectively threaded to the two limiting plates.

[0010] Preferably, a worm gear is fixedly sleeved at the middle of the outer side of the bidirectional screw, a worm is rotatably connected to the inner wall of the rotating cavity, the worm and the worm gear mesh with each other, a knob is rotatably connected to one side of the bearing plate, the output end of the knob passes through the bearing plate, and the output end of the knob is fixedly connected to one end of the worm.

[0011] Preferably, the control component includes multiple heat exchange chambers, which are located on both sides of the interior of the housing. Each heat exchange chamber has two chambers, and each heat exchange chamber corresponds to a placement chamber. Each heat exchange chamber has multiple ventilation holes on the side near the tray. An industrial constant temperature and humidity machine is fixedly installed on the upper end of the housing. Multiple air blowing chambers are located in the middle of the housing, and each air blowing chamber corresponds to a placement chamber. Multiple air outlets are located on the side of each air blowing chamber near the tray.

[0012] Preferably, the air supply end of the industrial constant temperature and humidity machine is connected to a first conveying pipe, and multiple output ends of the first conveying pipe are respectively connected to multiple heat exchange chambers located on one side of the box. The return air end of the industrial constant temperature and humidity machine is connected to a second conveying pipe, and multiple input ends of the second conveying pipe are respectively connected to multiple heat exchange chambers located on the other side of the box. A blower is installed at the upper end of the industrial constant temperature and humidity machine, and the output end of the blower is connected to a third conveying pipe. Multiple output ends of the third conveying pipe are respectively connected to multiple air blowing chambers.

[0013] Preferably, multiple laser displacement sensors are fixedly installed on the inner wall of the box, and each of the multiple laser displacement sensors corresponds to a multiple placement plate. A control panel is installed on one side of the box, and temperature and humidity sensors are fixedly installed on the inner walls of the multiple placement cavities.

[0014] A multi-channel self-testing method for premixed fluidized solidified soil includes the following steps: S1. The premixed fluidized solidified soil is poured into prism specimens of specified dimensions. After compaction and smoothing, the specimens are cured in a standard curing environment until the specified age. Then, the mold is removed, the chamber is opened, and the cured specimens are placed one by one and stably on the respective placement trays. At this time, the trays have been pre-fitted into the bearing plate through the groove at the bottom and are pre-fixed by the limiting components. No additional fixing operation is required from the operator, ensuring that the specimens are placed conveniently and in a uniform position. It is confirmed that all specimens are correctly placed and that the measuring endpoints of each specimen are within the effective measurement range of the corresponding laser displacement sensor. Then, the chamber door is closed, and preparation is made for environmental simulation experiments.

[0015] S2. Initialize the experimental parameters via the control panel. The industrial temperature and humidity control unit controls the target temperature and humidity range within the chamber, while the blower simulates and adjusts the airflow. Simultaneously, the control panel controls the data acquisition interval (e.g., once per minute) and the total experimental duration (e.g., days). S3. Start the control components. The industrial constant temperature and humidity chamber starts working. The treated constant temperature and humidity air is sent into the heat exchange chamber on one side of the chamber through the first delivery pipe. It exchanges heat and humidity with the air in the chamber through the ventilation holes. Then, it returns through the second delivery pipe from the heat exchange chamber on the other side, forming a circulation. At the same time, the blower sends the airflow into the blowing chamber through the third delivery pipe and blows it evenly onto the surface of the specimen through the air outlet to simulate the air flow under real drying conditions. The laser displacement sensor automatically, synchronously and non-contactly measures the shrinkage deformation data at both ends of all specimens according to the set acquisition frequency. The temperature and humidity sensor monitors the environmental data in each placement chamber in real time. All data is transmitted to the control panel in real time for centralized storage, display and processing.

[0016] S4. When the preset total experimental time is reached, the system automatically stops environmental control and data acquisition, and exports the time-series shrinkage deformation data of the specimen and the corresponding environmental data through the control panel for subsequent analysis work such as calculating the drying shrinkage rate and drawing shrinkage curves.

[0017] S5. Open the box and carefully remove the test pieces from each tray. Then, the operator operates the limiting assembly by rotating the knob installed on one side of the support plate. The rotation of the knob drives the worm gear fixedly connected to it to rotate synchronously. The worm gear drives the worm wheel to rotate, and the bidirectional screw rotates together with the worm wheel, driving the two limiting plates to slide in opposite directions in their respective sliding grooves. Under this operation, the two limiting plates simultaneously exit from the limiting grooves on both sides of the bottom groove of the tray, thereby releasing the lateral and longitudinal constraints on the tray.

[0018] S6. Pull out the pallet. As the pallet moves, the rack fixed on one side moves accordingly. The rack meshes with the spur gear, which drives the spur gear to rotate. The spur gear drives the one-way screw to rotate. The lifting frame will drive the pressure plate at its lower end to rise along the lifting groove. The upward movement of the pressure plate makes it disengage from the upper surface of the pallet, thus completely relieving the vertical downward pressure on the pallet.

[0019] S7. After the tray is removed, use appropriate cleaning tools to thoroughly clean the upper surface of the tray and the placement plate to remove specimen debris and dust, ensuring that it will not affect the flat placement of the specimen or the measurement accuracy of the laser displacement sensor in the next experiment. Then, push the empty tray back into the support plate, and the fixing component will automatically press down and fix the tray. Then, operate the limit component to reliably fix the tray and restore it to the initial state, preparing for the next experiment.

[0020] Compared with the prior art, the beneficial effects of the present invention are: This device integrates multi-channel parallel testing, non-contact measurement, programmable environmental simulation, automated control, and a detachable tray design to achieve efficient, accurate, and engineering-grade testing of the drying shrinkage performance of premixed fluidized solidified soil. The multi-channel design greatly improves experimental efficiency, allowing simultaneous testing of multiple specimens. The non-contact laser displacement sensor avoids contact stress interference, and combined with real-time monitoring by temperature and humidity sensors, it ensures high data accuracy and continuity. The control components independently control multiple factors such as temperature, humidity, and wind, realistically simulating complex working conditions. The fixing and limiting components work together to ensure stable positioning of the specimens during testing. The detachable tray design makes specimen installation and subsequent cleaning and maintenance more convenient, effectively preventing residues from affecting measurement accuracy and significantly improving the efficiency of experimental preparation and the sustainable use of the device. It achieves fully automated control and data acquisition of the experimental process, significantly improving the reliability, repeatability, and engineering guidance value of the test. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the main structure of a multi-channel self-testing device for premixed fluidized solidified soil; Figure 2 This is a schematic diagram of the internal structure of the housing of the present invention; Figure 3 This is a schematic diagram of the structure of the fixing component and the regulating component of the present invention; Figure 4 This is a schematic diagram of the rack and limiting groove of the present invention; Figure 5 This is a schematic diagram of the structure of the limiting component of the present invention; Figure 6 This is a schematic diagram of the structure of the control component of the present invention; Figure 7 This is a schematic diagram of the air blowing cavity of the present invention.

[0022] In the diagram: 1. Housing; 2. Placement cavity; 3. Support plate; 4. Tray; 5. Groove; 6. Placement plate; 7. Fixing assembly; 701. Lifting groove; 702. Rack; 703. One-way screw; 704. Lifting frame; 705. Spur gear; 706. Pressure plate; 8. Limiting assembly; 801. Rotating cavity; 802. Sliding groove; 803. Limiting groove; 804. Two-way screw; 805. Limiting plate; 806. Worm gear; 807. Worm; 808. Knob; 9. Control assembly; 901. Heat exchange cavity; 902. Ventilation port; 903. Industrial constant temperature and humidity machine; 904. Air blowing cavity; 905. Air outlet; 906. First conveying pipe; 907. Second conveying pipe; 908. Blower; 909. Third conveying pipe; 10. Laser displacement sensor; 11. Control panel; 12. Temperature and humidity sensor. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figures 1-7 As shown, the present invention provides a technical solution: a multi-channel self-testing device for premixed fluidized solidified soil, comprising a box 1 for heat preservation, multiple placement cavities 2 provided on the inner wall of the box 1, a bearing plate 3 fixedly connected to the bottom of the inner wall of each of the multiple placement cavities 2, a tray 4 placed on the upper end of each of the multiple bearing plates 3, a groove 5 opened at the lower end of each tray 4, the multiple grooves 5 respectively matching the multiple bearing plates 3, three placement plates 6 placed on the upper end of each of the multiple trays 4, a fixing component 7 for pressing down on the tray 4 installed on both sides of each placement cavity 2, a limiting component 8 for squeezing and fixing the tray 4 installed in each of the multiple bearing plates 3, and a control component 9 for simulating the testing environment installed in the box 1.

[0025] Furthermore, chamber 1, as the core sealed space, provides a stable thermal insulation environment for testing. Multiple placement chambers 2 within chamber 1 achieve functional spatial zoning, allowing multiple specimens to be tested in parallel without interference, significantly improving experimental efficiency. The support plate 3 at the bottom of each placement chamber 2 serves as the core support structure, providing a stable installation and support benchmark for the upper components. The tray 4, through its bottom groove 5, precisely fits into the support plate 3, achieving rapid pre-positioning and ensuring consistency and repeatability of installation position each time. The placement tray 6 directly carries the specimens; its modular design facilitates the removal and placement of specimens and the cleaning and maintenance of the device. The fixing component 7 effectively constrains the vertical displacement of the tray 4 by applying controllable downward pressure, preventing the specimen from moving slightly due to vibration or airflow during the experiment, thus ensuring measurement stability. The limiting component 8 squeezes and locks the tray from the horizontal direction, working together with the fixing component 7 to ensure the absolute fixation of the tray 4 in complex experimental environments, thereby providing a reliable reference platform for high-precision non-contact measurement. The control component 9 is responsible for accurately simulating the required temperature, humidity, and wind speed of the detection environment, providing a fundamental guarantee for the controllability of experimental conditions and the accuracy of results. Furthermore, the height of the upper surface of the placement tray 6 is higher than the height of the upper concave surface of the tray 4.

[0026] In the preferred embodiment of this technical solution, please refer to Figures 2-4 As shown, the fixing component 7 includes a lifting groove 701 and a rack 702. The lifting groove 701 is opened in the lower part of the inner wall of the placement cavity 2, and the rack 702 is fixedly connected to one side of the tray 4. A one-way screw 703 is rotatably connected to the inner wall of the lifting groove 701. A lifting frame 704 is slidably connected to the inner wall of the lifting groove 701. A one-way screw 703 passes through the lifting frame 704, and the lifting frame 704 and the one-way screw 703 are externally threaded. A spur gear 705 is fixedly sleeved on the lower part of the one-way screw 703. The spur gear 705 and the rack 702 mesh with each other. Pressure plates 706 are fixedly connected to both sides of the lower end of the lifting frame 704.

[0027] Furthermore, when the tray 4 is pushed in or pulled out, the rack 702 fixed to one side of it will move accordingly and drive the spur gear 705 meshing with it to rotate, thereby driving the one-way screw 703 coaxial with the spur gear 705 to rotate. Since the lifting frame 704 connected to the one-way screw 703 by a thread is restricted to sliding up and down in the lifting groove 701, it will drive the pressure plate 706 fixed at its lower end to perform lifting or pressing actions. This realizes the automatic linkage and release of the pressure plate 706 pressing and fixing during the placement and removal of the tray 4, without the need for additional operation. This ensures that the specimen is reliably fixed during the experiment to prevent micro-movement, and greatly simplifies the operation process, improving the automation level and ease of use of the device.

[0028] In the preferred embodiment of this technical solution, please refer to Figures 4-5 As shown, the limiting component 8 includes a rotating cavity 801, two sliding grooves 802 and two limiting grooves 803. The rotating cavity 801 is opened in the middle of the bearing plate 3, the two sliding grooves 802 are symmetrically opened on both sides of the bearing plate 3, and the two limiting grooves 803 are symmetrically opened on the inner walls of both sides of the groove 5. A bidirectional screw 804 is rotatably connected to the inner wall of the rotating cavity 801. The two ends of the bidirectional screw 804 pass through the inner walls of both sides of the rotating cavity 801, and the two ends of the bidirectional screw 804 are rotatably set in two sliding grooves 802. Limiting plates 805 are slidably connected in both sliding grooves 802. The two limiting plates 805 are respectively engaged with two limiting grooves 803. The two ends of the bidirectional screw 804 are threadedly connected to the two limiting plates 805. A worm gear 806 is fixedly sleeved at the middle of the outer side of the bidirectional screw 804. A worm 807 is rotatably connected to the inner wall of the rotating cavity 801. The worm 807 and the worm gear 806 mesh with each other. A knob 808 is rotatably connected to one side of the bearing plate 3. The output end of the knob 808 passes through the bearing plate 3 and is fixedly connected to one end of the worm 807.

[0029] Furthermore, the operator rotates the knob 808 to drive the worm gear 807 to rotate. Through the meshing transmission between the worm gear 807 and the worm wheel 806, the bidirectional screw 804 is driven to rotate within the rotating cavity 801. The reverse threads at both ends of the bidirectional screw 804 drive the two limiting plates 805 to move synchronously in opposite directions or in opposite directions within the corresponding sliding grooves 802. This allows the limiting plates 805 to precisely engage or disengage from the limiting grooves 803 on both sides of the bottom groove 5 of the tray 4. Utilizing the self-locking characteristic of the worm wheel 806 and worm gear 807 transmission, it is ensured that the limiting plates 805 will not loosen due to vibration during locking, providing extremely high locking reliability. At the same time, the structure of the bidirectional screw 804 ensures the synchronicity and symmetry of the movement of the two limiting plates 805, achieving stable and precise center positioning of the tray 4 and effectively preventing any displacement in the horizontal direction.

[0030] In the preferred embodiment of this technical solution, please refer to Figure 3 , Figure 6 and Figure 7 As shown, the control component 9 includes multiple heat exchange chambers 901, which are located on both sides inside the housing 1. Each heat exchange chamber 901 has two chambers, and each heat exchange chamber 901 corresponds to a placement chamber 2. Each heat exchange chamber 901 has multiple ventilation holes 902 on the side near the tray 4. An industrial constant temperature and humidity machine 903 is fixedly installed on the upper end of the housing 1. Multiple air blowing chambers 904 are located in the middle of the housing 1, and each air blowing chamber 904 corresponds to a multiple placement chamber 2. Each air blowing chamber 904 has multiple air outlet holes 905 on the side near the tray 4. The air supply end of the industrial constant temperature and humidity machine 903 is connected to a first conveying pipe 906. Multiple output ends of the first conveying pipe 906 are respectively connected to multiple heat exchange chambers 901 located on one side of the housing 1. The return air end of the industrial constant temperature and humidity machine 903 is connected to a second conveying pipe 907. Multiple input ends of the second conveying pipe 907 are respectively connected to multiple heat exchange chambers 901 located on the other side of the housing 1. A blower 908 is installed at the upper end of the industrial constant temperature and humidity machine 903. The output end of the blower 908 is connected to a third conveying pipe 909. Multiple output ends of the third conveying pipe 909 are respectively connected to multiple air blowing chambers 904.

[0031] It is worth noting that the 903 industrial constant temperature and humidity machine is existing technology. It mainly includes a refrigeration system, heater, humidifier, dehumidifier, fan, and high-precision temperature and humidity controller. Its working principle is based on closed-loop feedback control: the internal fan drives the air to circulate inside the machine, flowing through the refrigeration and heating coils and the humidification / dehumidification unit. The controller adjusts the start and stop and power of each actuator in real time to precisely cool, heat, humidify or dehumidify the air, thereby continuously outputting and maintaining constant temperature and humidity air with set parameters, providing stable and reliable environmental conditions for experiments. It will not be elaborated further here.

[0032] Furthermore, the constant temperature and humidity air generated by the industrial constant temperature and humidity machine 903 is sent into the heat exchange chamber 901 on one side of the housing 1 through the first delivery pipe 906, and undergoes a gentle heat and humidity exchange with the placement chamber 2 through the ventilation hole 902. Subsequently, the air flows back from the heat exchange chamber 901 on the other side to the industrial constant temperature and humidity machine 903 through the second delivery pipe 907, forming a closed circulation air path, thereby stably and uniformly regulating the temperature and humidity environment of each placement chamber 2. At the same time, the airflow generated by the blower 908 is independently transported through the third delivery pipe 909. The airflow is directed to each air-blowing cavity 904 and blown onto the surface of the specimen through the air outlet 905 to simulate real air-drying conditions. By separating the heat exchange cavity 901 and the air-blowing cavity 904 in terms of structure and airflow path, independent and precise control of the two key environmental factors, temperature, humidity and wind speed, is achieved, avoiding mutual interference. The parallel design of multiple sets of heat exchange cavities 901 and air-blowing cavities 904 ensures that the specimen in each placement cavity 2 is under consistent and controllable environmental conditions, which greatly improves the uniformity, repeatability and accuracy of the experiment.

[0033] In the preferred embodiment of this technical solution, please refer to Figures 1-2 As shown, multiple laser displacement sensors 10 are fixedly installed on the inner wall of the housing 1, and the multiple laser displacement sensors 10 correspond one-to-one with multiple placement plates 6. A control panel 11 is installed on one side of the housing 1, and temperature and humidity sensors 12 are fixedly installed on the inner walls of multiple placement cavities 2.

[0034] Furthermore, the laser displacement sensor 10, control panel 11, and temperature and humidity sensor 12 together constitute the core of the device for data acquisition and measurement and control. The lowest detection point of the laser displacement sensor 10 is parallel to the upper surface of the placement disk 6. Each placement disk 6 is monitored in real time by a corresponding laser displacement sensor 10 in a non-contact manner, accurately measuring the shrinkage deformation of the specimen. At the same time, the temperature and humidity sensor 12 in each placement cavity 2 continuously monitors the real data of the local microenvironment. All sensor data are collected at the control panel 11 for centralized processing, recording, and display, realizing synchronous, high-precision, and non-contact automatic acquisition of multi-channel deformation data, completely avoiding human error. Combined with distributed environmental monitoring, it ensures the accurate correspondence between experimental data and real environmental conditions, providing a reliable data foundation for accurately analyzing the drying shrinkage law of materials under different temperatures and humidity, and greatly improving the automation level of the experiment and the scientific nature of the results.

[0035] It should be noted that the laser displacement sensor 10, control panel 11, and temperature and humidity sensor 12 are all existing technologies. The laser displacement sensor 10 mainly consists of a laser emitter, an optical lens group, and a photodetector. It emits a laser beam to the surface of the specimen, receives the reflected light, and forms a light spot on the detector. By calculating the change in the position of the light spot, it accurately measures the displacement deformation of the specimen end in a non-contact manner. The temperature and humidity sensor 12 includes a temperature-sensitive element and a humidity-sensitive element. By sensing the changes in the physical properties of the ambient air, it converts the temperature and humidity parameters into standard electrical signals for output. The control panel 11, as the system hub, consists of a central processing unit, a data acquisition module, a storage unit, and a human-machine interface. By receiving and processing the electrical signals from the sensors, it realizes centralized setting of experimental parameters, real-time display and storage of measurement data, and monitoring of the overall system operation status. Further details will not be provided here.

[0036] A multi-channel self-testing method for premixed fluidized solidified soil; please refer to [link / reference]. Figures 1-7 As shown, it includes the following steps: S1. The premixed fluidized solidified soil is poured into prism specimens of specified dimensions. After compaction and smoothing, the specimens are cured in a standard curing environment until the specified age. Then, the mold is removed, the chamber 1 is opened, and the cured specimens are placed one by one and stably on the respective placement trays 6. At this time, the tray 4 has been initially fitted with the bearing plate 3 through the groove 5 at its lower end and is pre-fixed by the limiting component 8. No additional fixing operation is required from the operator, ensuring that the specimens are placed conveniently and in a uniform position. It is confirmed that all specimens are correctly placed and that the measuring endpoint of each specimen is within the effective measuring range of the corresponding laser displacement sensor 10. Then, the door of chamber 1 is closed to prepare for environmental simulation experiments.

[0037] S2. Initialize the experimental parameters via control panel 11. The industrial constant temperature and humidity machine 903 controls the target temperature and humidity range within chamber 1, and the blower 908 simulates and adjusts the wind speed. Simultaneously, control panel 11 controls the data acquisition interval (e.g., every 10 minutes) and the total experimental duration (e.g., 28 days). S3. Start the control component 9. The industrial constant temperature and humidity machine 903 starts working. The treated constant temperature and humidity air is sent into the heat exchange chamber 901 on one side of the chamber 1 through the first delivery pipe 906. It exchanges heat and humidity with the air in the chamber through the air exchange hole 902. Then, it returns from the heat exchange chamber 901 on the other side through the second delivery pipe 907 to form a circulation. At the same time, the blower 908 sends the airflow into the blowing chamber 904 through the third delivery pipe 909 and blows it evenly onto the surface of the specimen through the air outlet 905 to simulate the air flow under real drying conditions. The laser displacement sensor 10 automatically, synchronously and non-contactly measures the shrinkage deformation data at both ends of all specimens according to the set acquisition frequency. The temperature and humidity sensor 12 monitors the environmental data in each placement chamber 2 in real time. All data are transmitted to the control panel 11 in real time for centralized storage, display and processing.

[0038] S4. When the preset total experimental time is reached, the system will automatically stop environmental control and data acquisition. The system will export the time-series shrinkage deformation data of the specimen and the corresponding environmental data through the control panel 11 for subsequent analysis work such as calculating the drying shrinkage rate and drawing the shrinkage curve.

[0039] S5. Open the box 1 and carefully remove the test pieces from each of the placement trays 6. Then, the operator operates the limiting component 8 and rotates the knob 808 installed on one side of the support plate 3. The rotation of the knob 808 drives the worm gear 807 fixedly connected to it to rotate synchronously. The worm gear 807 can drive the worm wheel 806 to rotate. The bidirectional screw 804 rotates together with the worm wheel 806, driving the two limiting plates 805 to slide in opposite directions in their respective sliding grooves 802. Under this operation, the two limiting plates 805 synchronously exit from the limiting grooves 803 on both sides of the bottom groove 5 of the tray 4, thereby releasing the lateral and longitudinal constraints on the tray 4.

[0040] S6. Pull out the tray 4. As the tray 4 moves, the rack 702 fixed on one side moves accordingly. The rack 702 meshes with the spur gear 705, thereby driving the spur gear 705 to rotate. The spur gear 705 drives the one-way screw 703 to rotate. The lifting frame 704 will drive the pressure plate 706 at its lower end to rise along the lifting groove 701. The upward movement of the pressure plate 706 causes it to disengage from the upper surface of the tray 4, thereby completely releasing the vertical downward pressure on the tray 4.

[0041] S7. After the tray 4 is removed, use appropriate cleaning tools to thoroughly clean the upper surface of the tray 4 and the placement tray 6 to remove specimen debris and dust, ensuring that it will not affect the flat placement of the specimen or the measurement accuracy of the laser displacement sensor 10 in the next experiment. Then, push the empty tray 4 back into the support plate 3, and the fixing component 7 will automatically press down and fix the tray 4. Then, operate the limit component 8 to reliably fix the tray 4 and restore it to the initial state, preparing for the next experiment.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

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

Claims

1. A multi-channel self-testing device for premixed fluidized solidified soil, comprising a box (1) for heat insulation, characterized in that: The inner wall of the box (1) is provided with multiple placement cavities (2). The bottom of the inner wall of each of the multiple placement cavities (2) is fixedly connected to a support plate (3). Each of the multiple support plates (3) has a tray (4) placed on its upper end. Each tray (4) has a groove (5) at its lower end. Each of the multiple grooves (5) matches the multiple support plates (3). Each of the multiple trays (4) has three placement plates (6) placed on its upper end. Each of the placement cavities (2) has a fixing component (7) installed on both sides to press down the tray (4). Each of the multiple support plates (3) has a limiting component (8) installed inside to squeeze and fix the tray (4). The box (1) has a control component (9) for simulating the detection environment.

2. The multi-channel self-testing device for premixed fluidized solidified soil according to claim 1, characterized in that: The fixing component (7) includes a lifting groove (701) and a rack (702). The lifting groove (701) is opened at the lower part of the inner wall of the placement cavity (2). The rack (702) is fixedly connected to one side of the tray (4). A one-way screw (703) is rotatably connected to the inner wall of the lifting groove (701).

3. The multi-channel self-testing device for premixed fluidized solidified soil according to claim 2, characterized in that: The inner wall of the lifting groove (701) is slidably connected to a lifting frame (704). The one-way screw (703) passes through the lifting frame (704), and the lifting frame (704) and the one-way screw (703) are externally threaded together. A spur gear (705) is fixedly sleeved on the lower part of the outside of the one-way screw (703). The spur gear (705) and the rack (702) mesh with each other. Pressure plates (706) are fixedly connected to both sides of the lower end of the lifting frame (704).

4. The multi-channel self-testing device and method for premixed fluidized solidified soil according to claim 1, characterized in that: The limiting component (8) includes a rotating cavity (801), two sliding grooves (802) and two limiting grooves (803). The rotating cavity (801) is located in the middle of the bearing plate (3). The two sliding grooves (802) are symmetrically located on both sides of the bearing plate (3). The two limiting grooves (803) are symmetrically located on the inner walls of both sides of the groove (5).

5. The multi-channel self-testing device for premixed fluidized solidified soil according to claim 4, characterized in that: The inner wall of the rotating cavity (801) is rotatably connected to a bidirectional screw (804). The two ends of the bidirectional screw (804) pass through the inner walls of both sides of the rotating cavity (801), and the two ends of the bidirectional screw (804) are rotatably disposed in two sliding grooves (802). Limiting plates (805) are slidably connected in both sliding grooves (802). The two limiting plates (805) are respectively engaged with two limiting grooves (803). The two ends of the bidirectional screw (804) are respectively threadedly connected to the two limiting plates (805).

6. The multi-channel self-testing device for premixed fluidized solidified soil according to claim 5, characterized in that: A worm gear (806) is fixedly sleeved at the middle of the outside of the bidirectional screw (804). A worm (807) is rotatably connected to the inner wall of the rotating cavity (801). The worm (807) and the worm gear (806) mesh with each other. A knob (808) is rotatably connected to one side of the bearing plate (3). The output end of the knob (808) passes through the bearing plate (3) and is fixedly connected to one end of the worm (807).

7. The multi-channel self-testing device for premixed fluidized solidified soil according to claim 1, characterized in that: The control component (9) includes multiple heat exchange chambers (901), which are located on both sides inside the box (1). Each heat exchange chamber (901) has two chambers, and each heat exchange chamber (901) corresponds to a placement chamber (2). Each heat exchange chamber (901) has multiple air vents (902) on the side near the tray (4). An industrial constant temperature and humidity machine (903) is fixedly installed on the upper end of the box (1). Multiple air blowing chambers (904) are located in the middle of the box (1), and each air blowing chamber (904) corresponds to a multiple placement chamber (2). Each air blowing chamber (904) has multiple air outlets (905) on the side near the tray (4).

8. The multi-channel self-testing device for premixed fluidized solidified soil according to claim 7, characterized in that: The air supply end of the industrial constant temperature and humidity machine (903) is connected to a first conveying pipe (906). Multiple output ends of the first conveying pipe (906) are respectively connected to multiple heat exchange chambers (901) located on one side of the box (1). The return air end of the industrial constant temperature and humidity machine (903) is connected to a second conveying pipe (907). Multiple input ends of the second conveying pipe (907) are respectively connected to multiple heat exchange chambers (901) located on the other side of the box (1). A blower (908) is installed on the upper end of the industrial constant temperature and humidity machine (903). The output end of the blower (908) is connected to a third conveying pipe (909). Multiple output ends of the third conveying pipe (909) are respectively connected to multiple air blowing chambers (904).

9. The multi-channel self-testing device for premixed fluidized solidified soil according to claim 1, characterized in that: Multiple laser displacement sensors (10) are fixedly installed on the inner wall of the box (1). The multiple laser displacement sensors (10) correspond one-to-one with multiple placement plates (6). A control panel (11) is installed on one side of the box (1). Temperature and humidity sensors (12) are fixedly installed on the inner walls of multiple placement cavities (2).

10. A multi-channel self-testing method for premixed fluidized solidified soil, characterized in that, Includes the following steps: S1. The premixed fluidized solidified soil is poured into prism specimens of specified size. After compaction and smoothing, it is cured in a standard curing environment until the specified age. Then, the mold is removed, the box (1) is opened, and the cured specimens are placed one by one and stably on each placement tray (6). At this time, the tray (4) has been initially fitted with the bearing plate (3) through the groove (5) at its lower end and is pre-fixed by the limiting component (8). No additional fixing operation is required from the operator, ensuring that the specimens are placed conveniently and in a uniform position. It is confirmed that all specimens have been correctly placed and that the measuring endpoints of each specimen are within the effective measurement range of the corresponding laser displacement sensor (10). Then, the box (1) door is closed to prepare for environmental simulation experiment. S2. Initialize the experimental parameters through the control panel (11). The target temperature and humidity range inside the chamber (1) is controlled by the industrial constant temperature and humidity machine (903). The wind speed is simulated and adjusted by the blower (908). At the same time, the data acquisition interval (e.g., once every 10 minutes) and the total experimental duration (e.g., 28 days) are controlled through the control panel (11). S3. Start the control component (9), and the industrial constant temperature and humidity machine (903) starts working. The treated constant temperature and humidity air is sent into the heat exchange chamber (901) on one side of the box (1) through the first conveying pipe (906), and exchanges heat and humidity with the air in the box through the air exchange hole (902). Then, the air returns from the heat exchange chamber (901) on the other side through the second conveying pipe (907) to form a circulation. At the same time, the blower (908) sends the airflow into the blowing chamber (904) through the third conveying pipe (909), and blows it evenly onto the surface of the specimen through the air outlet (905) to simulate the air flow under real drying conditions. The laser displacement sensor (10) automatically, synchronously and non-contactly measures the shrinkage deformation data at both ends of all specimens according to the set acquisition frequency. The temperature and humidity sensor (12) monitors the environmental data in each placement chamber (2) in real time. All data are transmitted to the control panel (11) in real time for centralized storage, display and processing. S4. When the preset total experimental time is reached, the system automatically stops environmental control and data acquisition, and exports the time-series shrinkage deformation data and corresponding environmental data of all specimens through the control panel (11) for subsequent analysis work such as calculating drying shrinkage rate and drawing shrinkage curve. S5. Open the box (1), first carefully remove the test pieces from each of the placement trays (6), then the operator operates the limiting component (8) and rotates the knob (808) installed on one side of the bearing plate (3). The rotation of the knob (808) drives the worm gear (807) fixedly connected to it to rotate synchronously. The worm gear (807) can drive the worm wheel (806) to rotate. The bidirectional screw (804) rotates together with the worm wheel (806), driving the two limiting plates (805) to slide in opposite directions in their respective sliding grooves (802). Under this operation, the two limiting plates (805) synchronously exit from the limiting grooves (803) on both sides of the bottom groove (5) of the tray (4), thereby releasing the lateral and longitudinal constraints on the tray (4). S6. Pull out the tray (4). As the tray (4) moves, the rack (702) fixed on one side moves accordingly. The rack (702) meshes with the spur gear (705), thereby driving the spur gear (705) to rotate. The spur gear (705) drives the one-way screw (703) to rotate. The lifting frame (704) will drive the pressure plate (706) at its lower end to rise along the lifting groove (701). The upward movement of the pressure plate (706) causes it to disengage from the upper surface of the tray (4), thereby completely relieving the vertical downward pressure on the tray (4). S7. After the tray (4) is removed, use appropriate cleaning tools to thoroughly clean the upper surface of the tray (4) and the placement tray (6) to remove specimen debris and dust, ensuring that it will not affect the flat placement of the specimen or the measurement accuracy of the laser displacement sensor (10) in the next experiment. Then, push the empty tray (4) back into the support plate (3), and the fixing component (7) will automatically press down and fix the tray (4). Then, operate the limiting component (8) to reliably fix the tray (4) and restore it to the initial state, preparing for the next experiment.

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