Salinized soil initial freezing temperature experiment device

Abstract

The utility model provides a saline soil initial freezing temperature experimental device, and belongs to the technical field of saline soil experimental devices. Comprising a freezing and thawing machine box, a freezing and thawing bin is arranged on the upper portion in the freezing and thawing machine box, a large tray is horizontally placed at the bottom of the freezing and thawing bin, a plurality of stainless steel cutting rings are arranged in the large tray, samples are placed in the stainless steel cutting rings, a temperature sensor is inserted into the samples, and a limiting assembly is arranged on the outer side of the temperature sensor; the limiting assembly comprises an outer sleeve, limiting plates are welded to the bottoms of the two sides of the outer sleeve, the limiting plates are placed above the sample, and the temperature sensor penetrates through the outer sleeve to be inserted into the sample. During use, each group of temperature sensors is sleeved with the outer sleeve, the height of each group of temperature sensors is adjusted to be consistent, the insertion depth of each group of temperature sensors is consistent through the limiting plate, the soil penetration depth of the temperature sensors can be controlled, and the accuracy of an experiment result is ensured.

Description

Technical Field

[0001] This utility model belongs to the technical field of saline soil experimental devices, specifically relating to an experimental device for the initial freezing temperature of saline soil. Background Technology

[0002] Saline soils are widely distributed in my country, mainly concentrated in the Northwest, Northeast, North China, and coastal areas. These regions are mostly typical seasonally frozen soil areas in my country, and water and salt transport caused by freezing is an important reason for soil salinization. Currently, the research on the mechanism of hydrothermal salt transport in saline soils during freezing has become a hot topic and a difficult point in academia. In order to analyze the salt crystallization phenomenon in saline soils when the ambient temperature decreases and the effect of freezing temperature reduction, freeze-thaw equipment is usually used for experiments.

[0003] Most commercially available equipment for testing the initial freezing temperature of saline soil is similar in overall structure. The experimental platform, built around a freeze-thaw machine, temperature sensors, and a data acquisition instrument, involves placing saline soil samples into the freeze-thaw machine for freezing-thaw cycles and collecting temperature data via the temperature sensors. However, in practical use, there are some functional shortcomings and room for improvement. For example, saline soil samples are often filled into a ring cutter and sealed with a thin film. During the experiment, the temperature sensor must be inserted into the soil sample, and the depth of insertion affects the accuracy of the temperature data acquisition. The equipment also lacks a function to easily limit the depth of sensor insertion.

[0004] Therefore, a novel experimental apparatus for the initial freezing temperature of saline soil is proposed to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to overcome the problem of inaccurate temperature measurement caused by the different depths of temperature sensors inserted into the soil in existing devices, and to provide an experimental device for the initial freezing temperature of saline soil.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An experimental device for the initial freezing temperature of saline soil includes a freeze-thaw chamber. A freeze-thaw chamber is arranged at the top inside the freeze-thaw chamber. A large tray is placed horizontally at the bottom of the freeze-thaw chamber. Several stainless steel ring cutters are arranged inside the large tray. A sample is placed inside the stainless steel ring cutters. A temperature sensor is inserted into the sample. A limiting component is arranged outside the temperature sensor.

[0008] The limiting component includes an outer tube with limiting plates welded to the bottom of both sides of the outer tube. The limiting plates are placed above the sample, and the temperature sensor passes through the outer tube and is inserted into the sample.

[0009] The outer sleeve has a through hole, and a damping rubber ring is provided on the inner wall of the outer sleeve. Several anti-slip ridges are provided on the inner wall of the damping rubber ring.

[0010] The outer diameter of the temperature sensor is matched with the inner diameter of the damping rubber ring, and the damping rubber ring is elastic.

[0011] Several small trays are horizontally arranged at the bottom of the large tray. Each small tray has a through hole in the center. A stainless steel ring cutter is installed in the through hole. A magnetic plate is provided on the inner wall of the through hole to fix the stainless steel ring cutter.

[0012] The inner diameter of the magnetic suction plate is matched with the outer diameter of the stainless steel ring cutter.

[0013] The freeze-thaw chamber is externally connected to a controller, which is used to control the internal temperature of the freeze-thaw chamber.

[0014] The freeze-thaw machine is equipped with a support platform on the outside of the housing. A data acquisition instrument is installed on the top of the support platform. The data acquisition instrument is connected to a temperature sensor through a sensor wiring connection, and displays the temperature data collected by the temperature sensor through the data acquisition instrument.

[0015] The support platform has several fixed frames inside, and each fixed frame has multiple sets of fixed shafts inside. The fixed shafts are fitted with plastic sleeves, which can slide outside the fixed shafts.

[0016] The top of the plastic sleeve is higher than the top of the fixed frame, and the inner diameter of the plastic sleeve is matched with the outer diameter of the fixed shaft.

[0017] The freeze-thaw machine housing is equipped with a refrigeration system compressor.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This invention provides an experimental device for the initial freezing temperature of saline soil, including a freeze-thaw chamber. A freeze-thaw chamber is located at the top of the chamber, and a large tray is horizontally placed at the bottom. Several stainless steel ring cutters are placed inside the large tray, and samples are placed inside the ring cutters. Temperature sensors are inserted into the samples, and a limiting component is provided outside the temperature sensors. The limiting component includes an outer tube with limiting plates welded to the bottom of both sides of the outer tube. The limiting plates are placed above the samples, and the temperature sensors pass through the outer tube and are inserted into the samples. In use, the outer tube is fitted over each group of temperature sensors, and their height is adjusted to be consistent. The limiting plates ensure that the insertion depth of each group of temperature sensors is consistent, thereby controlling the insertion depth of the temperature sensors and ensuring the accuracy of the experimental results.

[0020] Furthermore, the damping rubber ring and anti-slip ridges inside the outer sleeve can increase friction, making it less likely for the temperature sensor to slide up and down.

[0021] Furthermore, the magnetic plate attracts the stainless steel ring cutter, making it less prone to slippage and displacement.

[0022] Furthermore, by setting up a support platform with several fixed frames inside, when there are a large number of sample groups, the large tray for storing samples is placed horizontally on the fixed frames. The sliding rollers composed of fixed shafts and plastic sleeves support the large tray, making it easy to pull it back and forth, facilitating placement and retrieval, and realizing the function of extracting and storing samples. Attached Figure Description

[0023] Figure 1 This is a front view structural diagram of the present utility model;

[0024] Figure 2 This is a magnified front view of the temperature sensor structure of this utility model;

[0025] Figure 3 This is an enlarged front cross-sectional view of the limiting component of this utility model;

[0026] Figure 4 This is a top-view enlarged structural diagram of the large tray of this utility model;

[0027] Figure 5 This is a top-view enlarged structural diagram of the fixed frame of this utility model.

[0028] In the diagram: 1. Freeze-thaw unit housing; 2. Refrigeration system compressor; 3. Freeze-thaw chamber; 4. Sealed door; 5. Large tray; 6. Refrigeration coil; 7. Controller; 8. Temperature sensor; 9. Sensor wiring; 10. Outer sleeve; 11. Limit plate; 12. Damping rubber ring; 13. Anti-slip ridge; 14. Small tray; 15. Magnetic suction plate; 16. Handle; 17. Label; 18. Stainless steel ring cutter; 19. Data acquisition instrument; 20. Support platform; 21. Fixed frame; 22. Fixed shaft; 23. Plastic sleeve. Detailed Implementation

[0029] To further understand the present invention, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. It should be understood that the embodiments are merely illustrative and not intended to limit the scope of the invention.

[0030] like Figures 1-5As shown, an experimental device for the initial freezing temperature of saline soil includes a freeze-thaw chamber 1. A refrigeration system compressor 2 is installed at the bottom of the freeze-thaw chamber 1. A freeze-thaw chamber 3 is set inside the top of the freeze-thaw chamber 1. A sealing door 4 is hinged to the left side of the front end of the freeze-thaw chamber 1. A large tray 5 is placed horizontally at the bottom of the freeze-thaw chamber 3. A refrigeration coil 6 is set on the inner wall of the freeze-thaw chamber 3. A controller 7 is fixedly connected to the outside of the freeze-thaw chamber. The controller 7 is used to control the temperature inside the freeze-thaw chamber 3. A support platform 20 is fixedly connected to the bottom right side of the freeze-thaw chamber 1. A data acquisition instrument 19 is placed horizontally at the top of the support platform 20. Multiple sets of stainless steel ring cutters 18 are set inside the large tray 5. Temperature sensors 8 are vertically inserted inside the stainless steel ring cutters 18. A sensor wiring 9 is movably connected between the temperature sensors 8 and the data acquisition instrument 19. The temperature data collected by the temperature sensors 8 is displayed by the data acquisition instrument 19. A limiting component is set outside the temperature sensors 8 to limit the depth of the sensors in the soil.

[0031] Furthermore, the limiting component includes an outer sleeve 10, which has a through hole and is sleeved around the outside of the temperature sensor 8. Limiting plates 11 are welded to the bottom ends of both sides of the outer sleeve 10. A damping rubber ring 12 is glued to the inner wall of the outer sleeve 10, and multiple anti-slip ribs 13 are provided on the inner wall of the damping rubber ring 12. The bottom ends of the outer sleeve 10 and the limiting plates 11 are flush, and the vertical center lines of the outer sleeve 10 and the limiting plates 11 coincide. The inner diameter of the damping rubber ring 12 is adapted to the outer diameter of the temperature sensor 8. The damping rubber ring 12 is elastic. The damping rubber ring 12 and the anti-slip ribs 13 are made of the same material, and the anti-slip ribs 13 are arranged at equal intervals to facilitate limiting the soil penetration depth of the temperature sensor 8.

[0032] Each set of temperature sensors 8 is covered with an outer sleeve 10, and their height is adjusted to be consistent. The damping rubber ring 12 and anti-slip rib 13 inside the outer sleeve 10 can increase the friction and make it difficult for the position to slide up and down. When inserted into the sample soil, the limiting plate 11 fits against the soil surface and stops applying force. The limiting plate 11 ensures that the insertion depth of each set of temperature sensors 8 is consistent, ensuring that the experimental results are as accurate as possible.

[0033] Furthermore, multiple small trays 14 are horizontally placed at the bottom of the large tray 5. Each small tray 14 has a through hole in the middle, and a magnetic plate 15 is provided on the inner wall of the through hole. The stainless steel ring knife 18 passes through the through hole and is attracted to the magnetic plate 15. Handles 16 are fixedly connected to both sides of the top of the small tray 14. A label 17 is provided at the front end of the top of the small tray 14. The inner diameter of the magnetic plate 15 is adapted to the outer diameter of the stainless steel ring knife 18. The handles 16 are symmetrically distributed about the vertical center line of the small tray 14, which facilitates the classification, placement and retrieval of samples. The small tray 14 is supported by the bottom of the stainless steel ring knife 18. The magnetic plate 15 attracts the stainless steel ring knife 18 so that it is not easy to slide or move. The handles 16 make it easy to pick up the small tray 14 together with the stainless steel ring knife 18. The label 17 makes it easy to attach labels.

[0034] Furthermore, the support platform 20 is used to store excess samples to be tested. The support platform 20 has two sets of fixed frames 21 fixedly connected inside. The fixed frames 21 are horizontally fixedly connected to multiple sets of fixed shafts 22. Plastic sleeves 23 are sleeved on the outside of the fixed shafts 22. The top of the plastic sleeves 23 is higher than the top of the fixed frames 21. The inner diameter of the plastic sleeves 23 is compatible with the outer diameter of the fixed shafts 22. The plastic sleeves 23 can slide outside the fixed shafts 22, which is convenient for storing and retrieving samples. The large tray 5 is placed horizontally on the fixed frames 21. The sliding rollers formed by the fixed shafts 22 and the plastic sleeves 23 support the large tray 5, which is convenient for pulling back and forth, and for placing and retrieving samples.

[0035] An experimental apparatus for testing the initial freezing temperature of saline soil, the method of use of which is as follows:

[0036] First, the prepared soil is filled into the stainless steel ring cutter 18, the sample is sealed with plastic wrap, and placed in a constant temperature environment for 24 hours. During the experiment, the sample is placed in the large tray 5 inside the freeze-thaw chamber 3. Then, the temperature sensor 8 is inserted along the top of the stainless steel ring cutter 18, with the bottom of the temperature sensor 8 reaching the center of the sample. Before inserting the temperature sensor 8, an outer sleeve 10 is fitted over each group of temperature sensors 8, and their height is adjusted to be consistent. The damping rubber ring 12 and anti-slip ridge 13 inside the outer sleeve 10 can increase the friction and prevent the position from sliding up and down. When inserting the sample soil, the limiting plate 11 fits against the soil surface, which stops the force. The limiting plate 11 ensures that the insertion depth of each group of temperature sensors 8 is consistent, ensuring that the experimental results are as accurate as possible. The sample is placed in the large tray 5 inside the freeze-thaw chamber 3, and the small tray 14 supports the bottom of the stainless steel ring cutter 18. The magnetic plate 15 attracts the stainless steel ring cutter 18 to prevent it from sliding and shifting. The handle 16 makes it easy to pick up the small tray 14 together with the stainless steel ring cutter 18. The label 17 makes it easy to attach the label sticker. When there are many sample groups, the large tray 5 for storing samples is placed horizontally on the fixed frame 21. The sliding roller formed by the fixed shaft 22 and the plastic sleeve 23 supports the large tray 5, making it easy to pull back and forth, and convenient to place and pick up.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. An experimental apparatus for the initial freezing temperature of saline soil, characterized in that, The freeze-thaw machine includes a freeze-thaw machine housing (1), a freeze-thaw chamber (3) is provided at the top inside the freeze-thaw machine housing (1), a large tray (5) is placed horizontally at the bottom of the freeze-thaw chamber (3), a number of stainless steel ring cutters (18) are provided inside the large tray (5), a sample is placed inside the stainless steel ring cutter (18), a temperature sensor (8) is inserted into the sample, and a limiting component is provided on the outside of the temperature sensor (8). The limiting component includes an outer tube (10), with limiting plates (11) welded to the bottom of both sides of the outer tube (10). The limiting plates (11) are placed above the sample, and the temperature sensor (8) is inserted into the sample through the outer tube (10).

2. The experimental apparatus for the initial freezing temperature of saline soil according to claim 1, characterized in that, The outer tube (10) is a through hole, and a damping rubber ring (12) is provided on the inner wall of the outer tube (10). Several anti-slip ridges (13) are provided on the inner wall of the damping rubber ring (12).

3. The experimental apparatus for the initial freezing temperature of saline soil according to claim 2, characterized in that, The outer diameter of the temperature sensor (8) is adapted to the inner diameter of the damping rubber ring (12), and the damping rubber ring (12) is elastic.

4. The experimental apparatus for the initial freezing temperature of saline soil according to claim 1, characterized in that, The large tray (5) has several small trays (14) horizontally arranged at the bottom. Each small tray (14) has a through hole in the center. A stainless steel ring cutter (18) is installed in the through hole. A magnetic suction plate (15) is provided on the inner wall of the through hole. The magnetic suction plate (15) is used to fix the stainless steel ring cutter (18).

5. The experimental apparatus for the initial freezing temperature of saline soil according to claim 4, characterized in that, The inner diameter of the magnetic plate (15) is compatible with the outer diameter of the stainless steel ring cutter (18).

6. The experimental apparatus for the initial freezing temperature of saline soil according to claim 1, characterized in that, The freeze-thaw chamber (3) is externally connected to a controller (7), which is used to control the internal temperature of the freeze-thaw chamber (3).

7. The experimental apparatus for the initial freezing temperature of saline soil according to claim 1, characterized in that, The freeze-thaw machine housing (1) is equipped with a support platform (20) on the outside. A data acquisition instrument (19) is installed on the top of the support platform (20). The data acquisition instrument (19) is connected to the temperature sensor (8) through the sensor wiring (9). The data acquisition instrument (19) displays the temperature data collected by the temperature sensor (8).

8. The experimental apparatus for the initial freezing temperature of saline soil according to claim 7, characterized in that, The support platform (20) has several fixed frames (21) inside, and each fixed frame (21) has multiple fixed shafts (22) inside. The fixed shafts (22) are fitted with plastic sleeves (23) on the outside, and the plastic sleeves (23) can slide outside the fixed shafts (22).

9. The experimental apparatus for the initial freezing temperature of saline soil according to claim 8, characterized in that, The top of the plastic sleeve (23) is higher than the top of the fixed frame (21), and the inner diameter of the plastic sleeve (23) is compatible with the outer diameter of the fixed shaft (22).

10. The experimental apparatus for the initial freezing temperature of saline soil according to claim 1, characterized in that, The freeze-thaw unit housing (1) is equipped with a refrigeration system compressor (2).

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