A frozen soil hollow cylindrical sample preparation device

Abstract

This invention provides a frozen soil hollow cylindrical sample preparation device, including a support module, a pressing module, and a base module. A drive motor is connected to a gear converter via a track, and the main gear of the gear converter is connected to the auxiliary gear at the bottom of the spiral column via a track. This transmission method can precisely control the rotation of the spiral column, thereby achieving stable lifting and lowering of the moving support. By rotating the spiral column, the height position of the moving support can be flexibly adjusted to meet the preparation requirements of samples of different heights and sizes. At the same time, the pressure sensor in the pressing module is connected to the moving support, which can conveniently realize the application and release of pressure on the soil sample mold. Because the device can accurately control the application and transmission of pressure, the pressing head can uniformly apply pressure to the frozen soil in the soil sample mold, so that the sample is uniformly compacted in all directions, thereby improving the uniformity of sample density and improving the quality of the frozen soil hollow cylinder.

Description

Technical Field

[0001] This utility model relates to the field of soil sample preparation technology, and in particular to a device for preparing hollow cylindrical frozen soil samples. Background Technology

[0002] In the study of the mechanical properties of frozen soil, high-quality hollow cylindrical specimens are the key to obtaining reliable mechanical parameters. At present, the main methods for preparing frozen soil specimens in the laboratory are manual compaction and static pressure. However, these traditional methods have inherent defects when preparing high-temperature, high-ice-content frozen soil specimens that are extremely sensitive to structural integrity, and are difficult to meet the requirements of modern precision testing.

[0003] First, the traditional compaction method compacts soil by instantaneous impact force. The impact force is large and uneven, which can easily shatter the fragile ice crystals inside the frozen soil or destroy the already formed ice-soil particle cementation structure, resulting in damage such as microcracks inside the sample. In addition, the driving method has problems such as uneven speed and pressure overshoot, which can also cause compression damage to the internal structure of the sample, making it difficult to ensure the homogeneity of the sample.

[0004] In view of this, the inventors specifically designed a device for preparing hollow cylindrical samples of frozen soil, which led to this invention. Utility Model Content

[0005] To solve the above problems, the technical solution of this utility model is as follows: A frozen soil hollow cylindrical sample preparation device includes a support module, a sample pressing module, a base module, a temperature control module, and a control module. The temperature control module is used to control the temperature of the sample pressing module, wherein: The support module, fixed above the base module, includes a top seat, support columns, a movable bracket, and spiral columns. There are four support columns, which are fixed around the base module. The tops of the four support columns are fixedly connected to the top seat. There are two spiral columns, which have threads in the same direction on their surfaces. The tops of the two spiral columns are movably connected to the top seat. The two ends of the movable bracket are threadedly connected to the two spiral columns respectively. The base module includes a base body, a drive motor, and a gear converter. The drive motor is connected to the gear converter in a transmission manner. The gear converter is provided with a support rod. A main gear is installed on the top of the support rod. The bottoms of the two spiral columns are located inside the base body and the ends are provided with auxiliary gears. The main gear and the auxiliary gear are connected in a transmission manner. The drive motor is connected to the control module in an electrical signal manner. The sample pressing module, located above the base module, includes a pressure sensor connected to a movable support and electrically connected to the control module.

[0006] Preferably, the pressure module further includes a pressure rod and a soil sample mold. The top of the pressure rod is connected to a pressure sensor, and the bottom of the pressure rod is detachably connected to the soil sample mold via a pressure head. The soil sample mold is located above the base module and is used for forming hollow cylindrical samples.

[0007] Preferably, the soil sample mold includes an outer cylinder and an inner column, the inner column is located inside the outer cylinder, a handle is installed at the top of the inner column, and a toothed upper pressure head and a toothed lower pressure head are respectively installed at the upper and lower ends of the inner column. The pressure head and the toothed upper pressure head can be detachably connected.

[0008] Preferably, both the toothed upper pressure head and the toothed lower pressure head are fitted with a clamping ring.

[0009] Preferably, the temperature control module includes a cold bath chamber and a temperature control chamber, the side wall of the temperature control chamber is equipped with a cold plate, and the temperature control chamber is connected to the cold bath chamber.

[0010] Preferably, the cold plate is embedded with a copper tube, which forms a refrigerant circulation channel. The copper tube has a refrigerant inlet and a refrigerant outlet at both ends, and the refrigerant inlet and refrigerant outlet are respectively connected to the cold bath box.

[0011] Preferably, the movable support is equipped with a displacement sensor, and the control module includes a computer monitor and a computer host. The computer host is electrically connected to the computer monitor, pressure sensor, displacement sensor, and drive motor.

[0012] The technical solution provided by this utility model has the following beneficial effects: In this invention, the drive motor is connected to the gear converter via a track, and the main gear of the gear converter is connected to the auxiliary gear at the bottom of the spiral column via the track. This transmission method can precisely control the rotation of the spiral column, thereby achieving stable lifting and lowering of the moving support. By rotating the spiral column, the height position of the moving support can be flexibly adjusted to meet the preparation requirements of samples of different heights and sizes. At the same time, the pressure sensor in the sample pressing module is connected to the moving support, which can conveniently realize the application and release of pressure on the soil sample mold. Since the device can accurately control the application and transmission of pressure, the sample pressing head can uniformly apply pressure to the frozen soil in the soil sample mold, so that the sample is uniformly compacted in all directions, thereby improving the uniformity of the sample's density and improving the quality of the frozen soil hollow cylinder. Attached Figure Description

[0013] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0014] in: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the support module structure in this utility model; Figure 3 This is a schematic diagram of the medium-pressure sample module structure of this utility model; Figure 4 This is a schematic diagram of the base module structure in this utility model; Figure 5 This is a schematic diagram of the soil sample mold structure in this utility model; Figure 6 This is a schematic diagram of the central temperature control box structure of this utility model; Label Explanation: 1. Support Module; 11. Top Seat; 12. Support Column; 13. Moving Bracket; 14. Spiral Column; 15. Upper Nut; 2. Sample Pressing Module; 21. Pressure Sensor; 22. Pressure Rod; 23. Soil Sample Mold; 231. Outer Cylinder; 232. Handle; 233. Inner Column; 234. Toothed Upper Pressure Head; 235. Toothed Lower Pressure Head; 236. Hoop; 24. Sample Pressing Head; 3. Base Module; 31. Base Body; 32. Drive Motor; 33. Gear Converter; 34. Track; 35. Support Rod; 36. Main Gear; 37. Secondary Gear; 38. Displacement Sensor; 4. Temperature Control Module; 41. Cold Bath Box; 42. Temperature Control Box; 43. Cold Plate; 44. Copper Pipe; 45. Coolant Inlet; 46. Coolant Outlet; 5. Control Module; 51. Computer Monitor; 52. Computer Host. Detailed Implementation

[0015] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0016] Please see Figures 1 to 6 This is a frozen soil hollow cylindrical sample preparation device, which is the preferred embodiment of this utility model. It includes a support module 1, a sample pressing module 2, a base module 3, a temperature control module 4, and a control module 5. The temperature control module 4 is used to control the temperature of the sample pressing module 2, wherein: Support module 1, fixed above base module 3, includes top seat 11, support columns 12, movable bracket 13, and spiral columns 14. Four support columns 12 are provided and fixed around the base module 3. The tops of the four support columns 12 are fixedly connected to the top seat 11 via upper nuts 15. Two spiral columns 14 are provided with threads in the same direction on their surfaces. The tops of the two spiral columns 14 are movably connected to the top seat 11. The movable bracket 13 is threadedly connected to the two spiral columns 14 at both ends. A displacement sensor 38 is provided on the movable bracket 13, and the displacement sensor 38 is connected to the control module. 5. Electrical signal connection: The support module 1 is fixed around the base module 3 by four support columns 12 and connected to the top seat 11 by the upper nut 15 to form a stable frame structure, providing a stable support foundation for the entire device, ensuring that the sample will not produce errors due to equipment shaking during the sample preparation process. The displacement sensor 38 monitors the displacement of the moving support 13 in real time and feeds it back to the control system to accurately control the pressing depth of the pressing head 24, thereby accurately controlling the height of the soil sample in the soil sample mold 23, thereby improving the dimensional accuracy of the frozen soil hollow cylindrical sample and ensuring that the sample height meets the test standard requirements. The sample compaction module 2, located above the base module 3, includes a pressure sensor 21. The pressure sensor 21 is connected to the movable support 13 and is electrically connected to the control module 5. It can conveniently apply and release pressure to the soil sample mold 23. Since the device can accurately control the application and transmission of pressure, the sample compaction head 24 can uniformly apply pressure to the frozen soil in the soil sample mold 23, so that the sample is uniformly compacted in all directions, thereby improving the uniformity of the sample density and improving the quality of the frozen soil hollow cylinder. The base module 3, which provides power and precision to the moving support 13, includes a base body 31, a drive motor 32, and a gear converter 33. The drive motor 32 is connected to the gear converter 33 via a track 34. The gear converter 33 has a support rod 35, with a main gear 36 mounted on the top of the support rod 35. The bottoms of the two spiral columns 14 are located inside the base body 31, and their ends are equipped with auxiliary gears 37. The main gear 36 and the auxiliary gear 37 are connected via the track 34. Simultaneously, the drive motor 32 in the base module 3 is connected to the gear converter 33 via the track 34, and the main gear 36 of the gear converter 33 is connected to the auxiliary gear 37 at the bottom of the spiral columns 14 via the track 34. This transmission method can precisely control the rotation of the spiral column 14, thereby achieving stable lifting and lowering of the moving support 13, ensuring the smoothness and accuracy of the sample pressing process, making the sample molding size more accurate. The pressing head 24 can uniformly apply pressure to the frozen soil in the soil sample mold 23, so that the sample is uniformly compacted in all directions, thereby improving the uniformity of sample density and ensuring the consistency of sample quality. The displacement sensor 38 and the pressure sensor 21 transmit the measured data to the control module 5. The control module 5 then adjusts the rotation of the drive motor 32 according to the collected data, thereby adjusting the distance and speed of the moving support 13 moving up and down, ensuring that the device can accurately control the application and transmission of pressure.

[0017] Please refer to Figures 1 to 6 The sample pressing module 2 includes a pressure rod 22 and a soil sample mold 23. The bottom of the pressure rod 22 is detachably connected to the soil sample mold 23 via a sample pressing head 24. The soil sample mold 23 is located above the base module 3 and is used for forming hollow cylindrical samples. The pressure sensor 21 in the sample pressing module 2 is connected to the moving bracket 13. The top of the pressure rod 22 is connected to the pressure sensor 21, and the bottom is detachably connected to the soil sample mold 23 via the sample pressing head 24. By controlling the lifting and lowering of the moving bracket 13, pressure can be easily applied and released to the soil sample mold 23, achieving automated sample pressing operation, improving sample preparation efficiency, and reducing the intensity and error of manual operation. The surface of the spiral column 14 is provided with threads in the same direction. The two ends of the moving bracket 13 are respectively threadedly connected to the two spiral columns 14. By rotating the spiral columns 14, the height position of the moving bracket 13 can be flexibly adjusted to meet the preparation requirements of samples of different heights and sizes, increasing the versatility and flexibility of the device.

[0018] Please refer to Figures 1 to 6The soil sample mold 23 includes an outer cylinder 231 and an inner column 233. The inner column 233 is located inside the outer cylinder 231. A handle 232 is installed at the top of the inner column 233. A toothed upper pressure head 234 and a toothed lower pressure head 235 are respectively installed at the upper and lower ends of the inner column 233. Both the toothed upper pressure head 234 and the toothed lower pressure head 235 are fitted with a clamping ring 236. The pressing head 24 and the toothed upper pressure head 234 can be detachably connected. The toothed upper pressure head 234 and the toothed lower pressure head 235 engage with the inner column 233 through a toothed structure to form a hollow cylindrical forming cavity. During the pressing process, the teeth... The shaped structure allows for better contact with the soil sample and the transmission of pressure, enabling the pressure to be distributed more evenly on the soil sample. This avoids the problem of excessively high or low local density of the sample due to uneven pressure, and improves the overall uniformity of the sample's density. This is beneficial for the uniformity of stress on the frozen soil sample during the test. By adjusting the size of the inner column 233 or replacing the outer cylinder 231 and inner column 233 with different specifications, this soil sample mold 23 can meet the preparation requirements of frozen soil hollow cylindrical samples of different diameters and heights. It has a certain degree of versatility and flexibility and can adapt to various test requirements.

[0019] For details, please refer to Figure 1 and Figure 6 It also includes a temperature control module 4, which comprises a cold bath chamber 41 and a temperature control chamber 42. A cold plate 43 is installed on the side wall of the temperature control chamber 42. The temperature control chamber 42 is connected to the cold bath chamber 41. The cold plate 43, installed on the side wall of the temperature control chamber 42 and connected to the cold bath chamber 41, allows for uniform and stable transfer of cooling energy into the temperature control chamber 42. This structure effectively reduces temperature fluctuations, ensuring that the temperature inside the temperature control chamber 42 remains at a constant level, providing a stable low-temperature environment for the preparation of frozen soil hollow cylindrical samples, and ensuring uniform temperature during the sample molding process, thereby guaranteeing the quality stability of the samples.

[0020] For details, please refer to Figure 6 A copper tube 44 is embedded within the cold plate 43, forming a refrigerant circulation channel. The copper tube 44 has a refrigerant inlet 45 and a refrigerant outlet 46 at each end, which are connected to the cold bath chamber 41. The refrigerant inlet 45 is located above the refrigerant outlet 46. The refrigerant circulates within the tube, ensuring uniform distribution of cooling energy across the cold plate 43. As the refrigerant circulates, it removes localized heat from the cold plate 43 and releases the cooling energy evenly into the interior space of the temperature control chamber 42. This uniform cooling distribution prevents localized overheating or undercooling within the temperature control chamber 42, ensuring uniform cooling of the frozen soil hollow cylindrical sample throughout the chamber. This is crucial for maintaining sample quality consistency, as a uniform temperature field helps preserve the homogeneity of the sample's physical and mechanical properties.

[0021] For details, please refer to Figure 1 The system also includes a control module 5, which comprises a computer display 51 and a computer host 52. The computer host 52 is electrically connected to the pressure sensor 21, displacement sensor 38, and drive motor 32. The computer host 52 can receive data from the pressure sensor 21 and displacement sensor 38 in real time and display key parameters such as pressure and displacement during the sample preparation process intuitively on the computer display 51. Operators can monitor the pressure and deformation of the sample in real time, promptly identify and adjust any potential problems, and ensure the smooth progress of the sample preparation process. By processing and analyzing the data from the pressure sensor 21 and displacement sensor 38 through the computer host 52, high-precision control of pressure and displacement can be achieved. For example, during the sample molding process, the applied pressure and displacement can be automatically adjusted according to the characteristics of the soil sample to ensure that the sample is molded under suitable conditions, improving the consistency and repeatability of sample quality.

[0022] The implementation principle of the frozen soil hollow cylindrical sample preparation device provided by this utility model is as follows: Before the test, the mass of dry soil, ice, and water required to prepare one hollow cylindrical sample is calculated based on the volume and bulk density of the hollow cylindrical sample. Then, the pre-prepared pure water ice block is taken out, and the ice block is crushed and passed through a 0.5cm sieve in a low-temperature laboratory adjusted to a negative temperature environment (below −7°C). The required mass of ice particles is weighed. The ice particles and the dry soil weighed under negative temperature conditions are mixed evenly. Then, pure water that has been pre-cooled to near 0°C is poured into the ice-soil mixture and stirred evenly. The temperature control module 4 of the equipment is started, so that the temperature control box 42 is controlled at −6°C−8°C. The soil sample mold 23 is assembled, and the ice-water-soil mixture is put into the cooled mold. The pressure rod 22 and the pressure head are slowly pressed down so that they contact the toothed upper pressure head 234. The displacement and pressure during the sample preparation process are monitored at any time using the control module 5. After the sample is installed, the temperature is adjusted to the target test temperature to carry out subsequent related test work.

[0023] In summary, the drive motor 32 in this invention is connected to the gear converter 33 via the track 34, and the main gear 36 of the gear converter 33 is connected to the auxiliary gear 37 at the bottom of the spiral column 14 via the track 34. This transmission method can precisely control the rotation of the spiral column 14, thereby achieving stable lifting and lowering of the moving support 13. By rotating the spiral column 14, the height position of the moving support 13 can be flexibly adjusted to meet the preparation requirements of samples of different heights and sizes. At the same time, by connecting the pressure sensor 21 in the sample pressing module 2 to the moving support 13, the pressure on the soil sample mold 23 can be easily applied and released. Since the device can precisely control the application and transmission of pressure, the sample pressing head 24 can uniformly apply pressure to the frozen soil in the soil sample mold 23, so that the sample is uniformly compacted in all directions, thereby improving the uniformity of the sample's density and improving the quality of the frozen soil hollow cylinder.

[0024] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A device for preparing a frozen soil hollow cylinder sample, characterized by, The system includes a support module (1), a sample pressing module (2), a base module (3), a temperature control module (4), and a control module (5). The temperature control module (4) is used to control the temperature of the sample pressing module (2). The support module (1) is fixed above the base module (3) and includes a top seat (11), support columns (12), a movable bracket (13) and a spiral column (14). There are four support columns (12) and they are fixed around the base module (3). The tops of the four support columns (12) are fixedly connected to the top seat (11). There are two spiral columns (14) and their surfaces are threaded in the same direction. The tops of the two spiral columns (14) are movably connected to the top seat (11). The two ends of the movable bracket (13) are threadedly connected to the two spiral columns (14). The base module (3) includes a base body (31), a drive motor (32) and a gear converter (33). The drive motor (32) is connected to the gear converter (33) in a transmission manner. The gear converter (33) is provided with a support rod (35). A main gear (36) is installed on the top of the support rod (35). The bottom of the two spiral columns (14) is located inside the base body (31) and the end is provided with a secondary gear (37). The main gear (36) and the secondary gear (37) are connected in a transmission manner. The drive motor (32) is connected to the control module (5) in an electrical signal manner. The sample pressing module (2) is located above the base module (3) and includes a pressure sensor (21). The pressure sensor (21) is connected to the moving bracket (13) and the pressure sensor (21) is electrically connected to the control module (5).

2. A device for preparing a frozen soil hollow cylinder sample according to claim 1, characterized in that, The pressure module (2) also includes a pressure rod (22) and a soil sample mold (23). The top of the pressure rod (22) is connected to the pressure sensor (21), and the bottom of the pressure rod (22) is detachably connected to the soil sample mold (23) through the pressure head (24). The soil sample mold (23) is located above the base module (3) and is used for forming hollow cylindrical samples.

3. A device for preparing a frozen soil hollow cylinder sample according to claim 2, characterized in that The soil sample mold (23) includes an outer cylinder (231) and an inner column (233). The inner column (233) is located inside the outer cylinder (231). A handle (232) is installed at the top of the inner column (233). A toothed upper pressure head (234) and a toothed lower pressure head (235) are respectively installed at the upper and lower ends of the inner column (233). The pressing head (24) and the toothed upper pressure head (234) can be detachably connected.

4. A device for preparing a frozen soil hollow cylinder sample according to claim 3, characterized in that Both the toothed upper pressure head (234) and the toothed lower pressure head (235) are fitted with a clamping ring (236).

5. The apparatus of claim 1, wherein the apparatus further comprises a heater. The temperature control module (4) includes a cold bath box (41) and a temperature control box (42). A cold plate (43) is installed on the side wall of the temperature control box (42), and the temperature control box (42) is connected to the cold bath box (41).

6. A device for preparing a frozen soil hollow cylinder sample according to claim 5, characterized in that The cold plate (43) is embedded with a copper tube (44), which forms a refrigerant circulation channel. The copper tube (44) has a refrigerant inlet (45) and a refrigerant outlet (46) at both ends, and the refrigerant inlet (45) and the refrigerant outlet (46) are respectively connected to the cold bath box (41).

7. The apparatus of claim 1, wherein the apparatus further comprises a freezing device. The movable support (13) is equipped with a displacement sensor (38), and the control module (5) includes a computer monitor (51) and a computer host (52). The computer host (52) is electrically connected to the computer monitor (51), pressure sensor (21), displacement sensor (38) and drive motor (32).

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