Dry-wet freezing and thawing cycle test device

Abstract

The utility model relates to a dry-wet freezing and thawing cycle test device, which is characterized in that a track tray with a drain hole is arranged, and two lifting tracks are used for driving the track tray to lift, so that the soaking process of a roadbed sample is realized; the controller controls the water pump to regulate and control the content of water in the test box, the integrated refrigerating and heating device is utilized to regulate and control the numerical values of the temperature and humidity in the test box, the dry and wet freeze-thaw cycle experiment of the roadbed sample is realized, and the durability of the roadbed sample only under the dry and wet freeze-thaw cycle is tested through repeated experiments; according to the device, through simple operation, the influence of external factors on the experiment is avoided according to the airtight space condition, and meanwhile, the durability of the roadbed sample is obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of wet-dry and freeze-thaw cycling experiments, and particularly relates to a wet-dry freeze-thaw cycling test device. Background Art

[0002] The statements herein only provide background art related to the utility model and do not necessarily constitute prior art.

[0003] In the natural environment, due to weather conditions such as rain, snow, and snowmelt, the stability of the roadbed gradually decreases. When the stability of the roadbed decreases to a certain extent, it will cause consequences such as roadbed settlement and road surface collapse, thus easily leading to serious traffic accidents.

[0004] Currently, the durability of the roadbed is tested through wet-dry cycling and freeze-thaw cycling experiments, and there are two ways to operate the experiments: manual and using a test chamber. Manual operation requires constantly transferring the roadbed samples to different devices for operations such as immersion in water, air drying, and drying. This method has a cumbersome process, and the roadbed samples are easily damaged during the transfer process. Test chamber operation uses an integrated wet-dry freeze-thaw cycling test device for experiments. When the existing test device immerses the roadbed samples in water, it usually uses methods such as water injection and spraying, resulting in only the surface of the roadbed samples being immersed in water, while the interior of the roadbed samples is not fully immersed, making the durability test results of the roadbed samples obtained through wet-dry freeze-thaw cycling experiments inaccurate.

[0005] Therefore, it is very necessary to provide a test device that can fully immerse the roadbed samples and test the durability of the roadbed through wet-dry freeze-thaw cycling experiments. Summary of the Utility Model

[0006] The technical problem to be solved by the utility model is to provide a wet-dry freeze-thaw cycling test device. By placing the roadbed samples on an orbital tray with drainage holes, using a lifting track to drive the movement of the orbital tray, and utilizing the drainage holes on the orbital tray to achieve full immersion of the roadbed samples in water; then by changing the temperature and humidity in the experimental area, wet-dry freeze-thaw cycling experiments are carried out on the roadbed samples to test the durability of the roadbed samples.

[0007] The object of the present utility model is to provide a dry-wet freeze-thaw cycle test device, which includes a test chamber, a partition board, two lifting tracks, a track tray, an air outlet, a water inlet and a water outlet. The partition board is arranged at one end close to the side of the test chamber, dividing the test chamber into a regulation area and an experimental area. The two lifting tracks are vertically arranged at the lower end of the partition board on one side of the experimental area. The track tray is arranged in the experimental area of the test chamber. On the side of the track tray close to the partition board, rectangular tooth grooves are arranged at positions opposite to the two lifting tracks for fixedly connecting with the two lifting tracks. The track tray is provided with drain holes distributed in an array. The air outlet is arranged on the partition board and is located at the upper end of the two lifting tracks. The water outlet is arranged at the bottommost end on one side of the partition board. The water inlet is arranged on the partition board and is located at the upper end of the water outlet.

[0008] As a further technical solution, the box body of the experimental area is made of transparent glass material.

[0009] As a further technical solution, the air outlet is arranged as a comb-shaped air outlet.

[0010] As a further technical solution, a filter screen is arranged on the surface of the drain hole.

[0011] As a further technical solution, the lifting track is a chain-type lifting track.

[0012] As a further technical solution, the bottommost end of the lifting track is on the same horizontal plane as the bottommost end of the partition board.

[0013] As a further technical solution, a blocking groove is arranged at the top end of the lifting track.

[0014] As a further technical solution, the surfaces of the lifting track and the track tray are coated with a waterproof protective layer.

[0015] As a further technical solution, the size of the track tray is the same as the size of the horizontal plane of the experimental area.

[0016] As a further technical solution, the water outlet is arranged as a blocking-type water outlet.

[0017] The beneficial effects of the above one or more technical solutions:

[0018] In this embodiment, a track tray with drain holes is provided. By placing the subgrade sample on the track tray and using the lifting track to drive the track tray to lift and lower, a sufficient immersion process of the subgrade sample is realized. Then, by changing the temperature and humidity conditions in the experimental area, a dry-wet freeze-thaw cycle experiment is carried out on the subgrade sample to obtain the durability of the subgrade sample. Description of the Drawings

[0019] The attached drawings forming a part of this application are used to provide a further understanding of this application. For ease of understanding, the proportions between the structures of each part have been adjusted. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation to this application.

[0020] Figure 1 It is a schematic structural diagram of the dry-wet freeze-thaw cycle test device of the present utility model.

[0021] Figure 2 It is a schematic operation principle diagram of the device inside the operation box of the present utility model.

[0022] Among them, 1. Regulation area, 2. Experimental area, 3. Air outlet, 4. Temperature and humidity sensor, 5. Lifting track, 6. Track tray, 7. Drain hole, 8. Water inlet, 9. Water outlet, 10. Controller, 11. Test chamber, 12. Partition board. Specific embodiments

[0023] The following combines the attached Figure 1-2 , and clearly and completely describes the technical solutions in the embodiments of the present utility model.

[0024] Embodiment 1

[0025] Refer to Figure 1 , a dry-wet freeze-thaw cycle test device, including a test chamber 11, a partition board 12, two lifting tracks 5, a track tray 6, an air outlet 3, a water inlet 8 and a water outlet 9; among them, the partition board 12 is arranged at one end close to the side of the test chamber 11, dividing the test chamber 11 into a regulation area 1 and an experimental area 2; among them, in this embodiment, the test chamber 11 is set as a cuboid structure, and the box body of the experimental area 2 is made of transparent glass material for observing the changes of the subgrade sample in real time; at the same time, the side of the experimental area 2 opposite to the partition board 12 is set as an openable glass door for taking and placing the subgrade sample.

[0026] In experimental area 2, two vertical lifting tracks 5 are provided at the lower end of partition 12. Among them, a chain-type lifting track is adopted in this embodiment. The bottom end of this lifting track 5 is on the same horizontal plane as the bottom end of partition 12, and a blocking groove is provided at the top end of the lifting track 5 to prevent the track tray 6 from detaching from the lifting track 5 during the process of driving the track tray 6 to lift and lower. And a track tray 6 is arranged in experimental area 2. On the side of the track tray 6 close to partition 12, rectangular tooth grooves are provided at positions opposite to the two lifting tracks 5. The rectangular tooth grooves have the same size as the rectangular grooves between two joints on the chain-type lifting track, and are fixedly connected to the two lifting tracks 5 through the rectangular tooth grooves. At the same time, drain holes 7 are arranged in an array on the surface of the tray track 6. These drain holes 7 are used to allow water to pass through the track tray 6 during the lifting and lowering process of the track tray 6, so as to perform the immersion operation on the subgrade samples placed on the track tray 6. The track tray 6 is also of a cuboid structure, and the size of the track tray 6 is the same as the area size of the horizontal plane of experimental area 2, and its thickness and material are not required here. At the same time, a filter screen is arranged on the surface of the drain holes 7 to prevent the blocky objects dropped by the subgrade samples from blocking the water outlet 9.

[0027] An air outlet 3 is provided on partition 12 and is located above the two track trays 5. The air outlet 3 in this embodiment is set as a comb-shaped air outlet for the gentle flow of air to regulate the temperature and humidity of the air in experimental area 2. And a water outlet 9 is provided at the bottom end on one side of partition 12. At the same time, a water inlet 8 is provided above the water outlet 9 on the partition. The water inlet 8 is used to convey water into experimental area 2, and the water outlet 9 is used to drain the water in experimental area 2. The water content and height of the water in experimental area 2 are regulated through the water inlet 8 and the water outlet 9. At the same time, the water outlet 9 is set as a blocking-type water outlet, and the water outlet 9 is set to the closed state during the process of conveying water into experimental area 2.

[0028] During the experiment, both experimental area 2 and regulation area 1 are kept in a sealed state to avoid interference from external factors during the experiment. At the same time, a waterproof protective layer is coated on the surfaces of the lifting track 5 and the track tray 6 to prevent the device from being eroded by being soaked in water for a long time, so as to extend the service life of the test device.

[0029] Embodiment Two

[0030] Refer to Figure 1-2 , on the basis of Embodiment One, on the front shell of regulation area 1 (taking Figure 1A controller 10 is provided at the upper end of the surface shown as the front surface), and a display screen and a certain number of operation buttons are provided on the controller 10. The devices in the regulation box 1 are controlled through the operation buttons to perform corresponding experiments; the terminal of the controller 10 and the control chip used can be selected according to different needs, which is not required here. At the same time, a temperature and humidity sensor 4 is provided between the air outlet 3 and the two lifting rails 5 on the partition 12 to monitor the temperature and humidity data in the experimental area 2 in real time and display it on the display screen of the controller 10.

[0031] The controller 10 is connected to the air outlet 3 through an integrated refrigeration and heating device. The integrated refrigeration and heating device used in this embodiment can generate air in the range of -50°C to 70°C, and transmit the generated air into the experimental area 2 through the air outlet 3 for processes such as drying and freezing of the subgrade samples; at the same time, the controller 10 is connected to the lifting rail 5 through a forward and reverse drive motor, and the controller 10 can use one or two buttons to control the forward and reverse rotation of the drive motor to control the rise and fall of the lifting rail 5; at the same time, the controller 10 is also connected to the water inlet 8 through a water pump, and the water pump is connected to the water tank at the same time. The controller 10 can control the operation of the water pump, so as to pump the water in the water tank through the water pump and enter the interior of the experimental area 2 through the water inlet 8; finally, the temperature and humidity sensor 4 is connected to the display screen of the controller 10. After converting the data obtained by the temperature and humidity sensor 4, it is displayed on the display screen to monitor the temperature and humidity status inside the experimental area 2 in real time; the water outlet 9 is also controlled by the button of the controller 10 to open or close the water outlet 9 for the outflow of water inside the experimental area 2. There is no requirement for the installation position of various devices in the regulation area 1.

[0032] Experimental steps:

[0033] (1) First, place the subgrade sample on the surface of the track tray 6 and use the controller 10 to control the water outlet 9 to be in the closed state.

[0034] (2) Control the water pump to draw water from the water tank through the controller 10 on the surface of the regulation box 1 and transport it into the interior of the experimental area 2 through the water inlet 8 (at this time, the position of the track tray 6 is higher than the position of the water inlet 8). Stop the water pump from pumping water when the water reaches a height that can submerge the foundation sample (ensure that the water does not exceed the height of the water inlet hole 8).

[0035] (3) Control the forward and reverse drive motor to rotate through the controller 10, so that the lifting rail 5 drives the track tray 6 to descend until the water submerges the foundation sample, then stop the track tray 6 from descending. After the time required for the static experiment, control the lifting rail 5 to drive the track tray 6 to rise until the foundation sample is out of the water surface, and then stop the track tray 6 from rising.

[0036] (4) When it is necessary to dry or freeze the subgrade sample, the controller 10 controls the integrated refrigeration and heating device to generate air at a corresponding temperature to reach the temperature required for the experiment, so as to dry or freeze the subgrade sample, and display the data monitored by the temperature and humidity sensor 4 through the display screen of the controller 10; during this process, the controller 10 also regulates the water content in the experimental area 2 by adjusting the water pump and the water outlet hole according to the displayed temperature and humidity data, so as to meet the required temperature and humidity standards.

[0037] (5) After the drying treatment is completed and it is necessary to immerse the subgrade sample again, repeat the process of steps (1)-(3); after the freezing treatment is completed and it is necessary to thaw the subgrade sample, the controller 10 can be used to control the integrated refrigeration and heating device to generate air at the required temperature to thaw the subgrade sample. At the same time, the controller 10 can also regulate the water content in the test chamber 11 and the height of the track tray 6 to immerse the subgrade sample in water and accelerate the thawing process.

[0038] Through the above steps, the processes of drying, immersing, etc. of the subgrade sample can be completed through simple operations, so as to realize the cyclic experiment of wetting, drying, freezing and thawing of the subgrade sample. At the same time, based on the closed environment formed by the experimental area 2 and the regulation box 1, the interference of external factors on the cyclic experiment can be effectively avoided, and finally the durability test of the subgrade sample only under the state of wetting, drying, freezing and thawing cycles can be obtained.

[0039] Although the specific implementation manners of the present invention have been described above in conjunction with the drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications or deformations that can be made without creative labor on the basis of the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A dry-wet freeze-thaw cycle test device, comprising a test chamber, a partition board, two lifting tracks, a track tray, an air outlet, a water inlet and a water outlet. The partition board is arranged at one end close to the side of the test chamber, dividing the test chamber into a regulation area and an experimental area. The two lifting tracks are vertically arranged at the lower end of the partition board on one side of the experimental area. The track tray is arranged in the experimental area of the test chamber. On the side of the track tray close to the partition board, rectangular tooth grooves are arranged at positions opposite to the two lifting tracks for fixedly connecting with the two lifting tracks. The track tray is provided with drain holes distributed in an array. The air outlet is arranged on the partition board and is located at the upper end of the two lifting tracks. The water outlet is arranged at the lowermost end on one side of the partition board. The water inlet is arranged on the partition board and is located at the upper end of the water outlet.

2. The dry-wet freeze-thaw cycle test device according to claim 1, wherein The box body of the experimental area is made of transparent glass material.

3. The dry-wet freeze-thaw cycle test device according to claim 1, wherein The air outlet is arranged as a comb-shaped air outlet.

4. A dry-wet freeze-thaw cycle test device according to claim 1, characterized in that, A filter screen is arranged on the surface of the drain hole.

5. The dry-wet freeze-thaw cycle test device according to claim 1, characterized in that, The lifting track is a chain-type lifting track.

6. The dry-wet freeze-thaw cycle test device according to claim 5, wherein, The lowermost end of the lifting track is on the same horizontal plane as the lowermost end of the partition board.

7. The wet-dry freeze-thaw cycle test device according to claim 5, wherein, A blocking groove is arranged at the top end of the lifting track.

8. The wet-dry freeze-thaw cycle test device according to claim 1, characterized in that, The surfaces of the lifting track and the track tray are coated with a waterproof protective layer.

9. The dry-wet freeze-thaw cycle test device according to claim 1, characterized in that, The size of the track tray is the same as the size of the horizontal plane of the experimental area.

10. A dry-wet freeze-thaw cycle test device according to claim 1, characterized in that, The water outlet is arranged as a blocking-type water outlet.

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