Precise sample preparation instrument

Abstract

The utility model discloses a precise sample preparation instrument which comprises a pressurizing device and a matched soil sample mold, the pressurizing device comprises a pressure sensor and a pressurizing reaction frame jack; the soil sample mold comprises a sample preparation barrel, a sampling barrel, a base for placing the sample preparation barrel and the sampling barrel, a first pressing block, a second pressing block, a third pressing block and a soil pushing block; the sample preparation barrel and the sampling barrel are cylindrical pipelines with two open ends and are used as main molds for preparing soil samples; the first pressing block, the second pressing block, the third pressing block and the bulldozing block are respectively provided with a cylindrical bulge, and the size of the cylindrical bulge is matched with that of the sample preparation barrel. According to the precise sample preparation instrument disclosed by the utility model, the sample preparation barrel, the sampling barrel and the matched soil sample mold are arranged, so that a soil sample is uniformly stressed in the preparation process; meanwhile, the pressurizing reaction frame jack enables the pressurizing process to be more uniform, and a matched soil sample mold is matched to ensure that the soil sample is not subjected to excessive stress or damage in the whole preparation process in a manner of pressurizing the soil sample for multiple times.

Description

TECHNICAL FIELD

[0001] The utility model relates to a precision sample preparation instrument belongs to geotechnical test device technical field. BACKGROUND

[0002] The precision sample preparation instrument is a high-precision instrument for soil sample preparation, widely used in soil science, geology, civil engineering and environmental science, etc. In the process of soil-related experiments and analysis, accurate sample preparation is crucial, because the representativeness and consistency of the sample directly affect the accuracy and reliability of the experimental results.

[0003] In the traditional soil sample preparation process, the method of pressurized soil preparation is usually used, which simply presses the soil sample by single mechanical force to achieve the required density and structure. However, this method has certain limitations, such as the heterogeneity contact surface sample preparation mold and device disclosed in patent application CN214040886U, especially in terms of stress removal and sample preparation standardization. Because the design of traditional pressurized sample preparation equipment usually focuses on the rapid preparation of soil samples, it often cannot effectively reduce the stress in the sample preparation process, resulting in the problem of residual stress in the sample in the subsequent experimental process. These residual stresses will have adverse effects on the physical properties, mechanical behavior and chemical reactions of the soil, and thus affect the accuracy of the experimental results. Especially when high-precision analysis of soil properties is required, the traditional pressurized soil sample preparation method cannot completely eliminate the internal stress in the soil sample, so that the performance of the sample in the experiment cannot fully reflect the original state of the soil. In addition, traditional soil sample preparation often cannot be standardized, and for some experiments that require high precision and stability, such as soil shear test, porosity analysis and soil structure analysis, the traditional pressurized sample preparation equipment may cause deviation and inconsistency of the results.

[0004] Therefore, it is necessary to design a new type of precision sample preparation instrument, which can make soil samples through the dual action of sample mold and pressurizing device in a multi-pressurizing manner, reduce the stress effect of the whole soil sample preparation process, and standardize the soil sample preparation, so as to meet the requirements of accuracy and reliability in soil sample preparation. UTILITY MODEL CONTENT

[0005] Therefore, the purpose of the utility model is to provide a precision sample preparation instrument that can standardize soil sample preparation and reduce the stress effect of the whole soil sample preparation process.

[0006] In order to achieve the above object, the utility model discloses a precision sample preparation instrument, including pressure device and matched soil sample mould, the pressure device includes pressure sensor and pressure reaction frame jack, the soil sample mould includes the sample preparation cylinder for making soil sample, the sampling cylinder for taking out the soil sample in sample preparation cylinder, the base for placing sample preparation cylinder and sampling cylinder, first briquetting, second briquetting, third briquetting and bulldozing block, the sample preparation cylinder and sampling cylinder are both open both ends cylindrical pipeline, as the main mould for making soil sample, first briquetting, second briquetting, third briquetting and bulldozing block all have cylindrical convex, and its size is matched with sample preparation cylinder.

[0007] The length of the sample preparation cylinder is the sample preparation height plus 50mm, the cylindrical convex length of the first briquetting is 2 / 3 of the sample preparation height plus 50mm, the cylindrical convex length of the second briquetting is 1 / 3 of the sample preparation height plus 50mm, the cylindrical convex length of the third briquetting is 50mm, and the cylindrical convex length of the bulldozing block is the same as the total length of the sample preparation cylinder.

[0008] The caliber of the cylindrical convex of the bulldozing block, the first briquetting, the second briquetting and the third briquetting is consistent with the pipeline caliber of the sample preparation cylinder.

[0009] The pressure reaction frame jack includes a jack and a reaction frame, and the jack is installed on the fixed seat of the reaction frame.

[0010] The pressure device includes a timer, and the timer is installed on the crossbeam of the reaction frame.

[0011] The reaction frame can adjust the height.

[0012] The pressure sensor is fixed to the lower surface of the crossbeam of the reaction frame, or the pressure sensor is freely placed outside and is placed at the detection position during use.

[0013] The upper surface of the base is provided with a circular groove matched with the bottom surface shape of the sample preparation cylinder and the sampling cylinder.

[0014] The top end of the sampling cylinder is provided with an annular placement groove, and the top end placement groove shape of the sampling cylinder is matched with the bottom surface shape of the sample preparation cylinder.

[0015] The caliber of the sampling cylinder is greater than the caliber of the sample preparation cylinder.

[0016] The utility model discloses a precision sample preparation instrument, through setting up sample preparation cylinder, sampling cylinder and the soil sample mould of matching, ensure that the uniform stress and standardization of soil sample in preparation process, avoid the uneven pressure appearance that can appear in traditional pressurization method, guarantee the representativeness and consistency of soil sample. Meanwhile, equip pressure sensor and timer, real time monitoring pressure change and time control in pressurization process, thereby ensure the accuracy of pressurization load, avoid the experimental error caused by uneven pressure or improper control. In addition, the pressurization reaction frame jack makes the pressurization process more uniform, and the height adjustable function further optimizes the uniformity of pressurization, and the soil sample mould is matched, and the soil sample is ensured not to be damaged by excessive stress in the whole preparation process. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the whole structure schematic diagram of the utility model.

[0018] Figure 2 It is the pressurization device structure schematic diagram of the utility model.

[0019] Figure 3 It is the front view of the soil sample mould of the utility model.

[0020] Figure 4 It is the use state schematic diagram of the utility model. DETAILED DESCRIPTION

[0021] The utility model is further explained in detail by the drawings and specific embodiments.

[0022] As shown in Figures 1-4 The utility model discloses a precision sample preparation instrument, including pressurization device 2 and the soil sample mould 1 of matching, the pressurization device 2 includes pressure sensor 4 and pressurization reaction frame jack 3, the soil sample mould 1 includes the sample preparation cylinder 7 for making soil sample, the sampling cylinder 8 for taking out the soil sample in sample preparation cylinder 7, the base 6 for placing sample preparation cylinder 7 and sampling cylinder 8, first pressure block 11, second pressure block 12, third pressure block 13 and bulldozer block 14, the sample preparation cylinder 7 and sampling cylinder 8 are both open cylinder pipe at both ends, as the main mould for making soil sample, first pressure block 11, second pressure block 12, third pressure block 13 and bulldozer block 14 all have cylindrical protrusions, and its size is matched with sample preparation cylinder 7. Through sample preparation cylinder 7, sampling cylinder 8 and the pressure block matched with it, bulldozer block 14, equip pressurization device 2 and pressure sensor 4, can ensure the uniform pressure of soil sample in preparation process, effectively remove internal stress, thereby improve the consistency and accuracy of soil sample. In addition, its modular design makes the operation simple, convenient to maintain, and the uniform pressurization control of pressurization reaction frame jack 3 guarantees the accuracy of load application process and the quality of soil sample.

[0023] The length of the sample preparation cylinder 7 is the height of the soil sample plus 50mm; the length of the cylindrical protrusion of the first pressing block 11 is 2 / 3 of the height of the soil sample plus 50mm; the length of the cylindrical protrusion of the second pressing block 12 is 1 / 3 of the height of the soil sample plus 50mm; the length of the cylindrical protrusion of the third pressing block 13 is 50mm; and the length of the cylindrical protrusion of the bulldozing block 14 is the same as the total length of the sample preparation cylinder 7. The step-by-step pressing method can effectively prevent the soil sample from being excessively compressed or stress concentrated during the pressing process, ensuring that the compaction process of the soil sample is more uniform and stable, and preventing the soil sample from being deformed or damaged due to excessive stress. Moreover, the different lengths of the protrusions of the pressing blocks allow the soil material to be pressed in layers, simulating the layered structure of the soil in a natural state, which helps to preserve the true physical properties of the soil sample, prevents the soil particles from being excessively compacted or deformed, and improves the reliability and authenticity of the experimental results. In addition, the matching of the pressing blocks with the sample preparation cylinder 7 ensures uniformity during the pressing process, making the pressure distribution more accurate and avoiding the uneven compaction or stress concentration that may occur in traditional methods, ensuring that the pressing process of the soil sample meets the experimental requirements. Furthermore, the use of the matching soil sample mold 1 completes the standardized sample preparation, ensuring the representativeness and consistency of the soil sample and improving the reliability of the experiment.

[0024] The diameters of the cylindrical protrusions of the bulldozing block 14, the first pressing block 11, the second pressing block 12, and the third pressing block 13 are consistent with the diameter of the pipeline of the sample preparation cylinder 7, which ensures that the pressing blocks perfectly match the sample preparation cylinder 7 during the pressing process, allowing the pressure to be evenly distributed on the soil sample and preventing local stress concentration or uneven pressing, ensuring that the soil sample is uniformly stressed during the pressing process and improving the accuracy of the sample preparation.

[0025] The counterforce frame jack 3 includes a jack 32 and a counterforce frame 31, and the jack 32 is installed on the fixed seat 33 of the counterforce frame 31, which makes the structure of the entire pressing system more solid and durable, reduces equipment wear or loosening caused by long-term use, prolongs the service life of the equipment, and ensures long-term stable operation of the system.

[0026] The pressing device 2 includes a timer 5 installed on the counterforce frame 31, which is used to accurately record and control the time of the pressing process, ensuring that each pressing step is performed according to the predetermined time. This helps to achieve a stable pressing process, avoids affecting the compaction effect of the soil sample due to excessive or insufficient pressing time, thereby improving the uniformity of the soil sample and the accuracy of the experimental data, and achieving standardized sample preparation.

[0027] The counterforce frame 31 can adjust the height, so that the device can adapt to the requirements of different sizes and types of soil sample preparation.

[0028] The pressure sensor 4 is in the shape of a cylinder, which has a simple and stable structure, facilitating installation and fixation in the pressing device 2.

[0029] The pressure sensor 4 can be fixed to the lower surface of the crossbeam of the counterforce frame 31, or freely placed outside, and placed at the detection position during use. In the embodiment, the pressure sensor 4 is freely placed outside.

[0030] The upper surface of the base 6 can be provided with a smooth surface or a circular groove 61. In the embodiment, the base 6 is provided with the circular groove 61, which matches the shape of the bottom surface of the sample preparation cylinder 7 and the sampling cylinder 8. The matched circular groove 61 can ensure accurate butt joint of the sample preparation cylinder 7 and the sampling cylinder 8, avoiding errors caused by misalignment or uneven bottom surface. Meanwhile, the base 6 can stably support the two molds, avoiding sliding or tilting during operation.

[0031] The top end of the sampling cylinder 8 is provided with an annular placement groove 81, which matches the shape of the bottom surface of the sample preparation cylinder 7. Such design can effectively avoid damage or deformation of the soil sample caused by improper contact between the sampling cylinder 8 and the sample preparation cylinder 7. By ensuring accurate butt joint, the integrity of the soil sample can be maintained during sampling, avoiding scattering or quality loss of the soil sample caused by misalignment or unstable placement.

[0032] The caliber of the sampling cylinder 8 is larger than that of the sample preparation cylinder 7, which is used to ensure the free flow of the soil sample during transfer, avoiding the phenomenon of jamming or blocking caused by excessive friction between the soil sample and the cylinder wall during transfer. Moreover, the wider caliber makes the sampling process more smooth, reducing the interruption or error of the experiment caused by equipment problems.

[0033] During the preparation of the soil sample, the preparation process is as follows:

[0034] ①Preparation of soil and preliminary device: divide the prepared soil into three equal parts by quality. Place the base 6 on the ground, and place the sample preparation cylinder 7 thereon. Put the first test soil into the sample preparation cylinder 7, and put the first pressing block 11 at the same time.

[0035] ②First pressing: place the sample preparation cylinder 7 containing the soil and the first pressing block 11 and the base 6 on the top block 321 of the pressing counterforce frame jack 3. Place the pressure sensor 4 on the first pressing block 11, and start pressing. At this time, the pressure sensor 4 will record the load applied to the soil in real time during the loading process. When the first pressing block 11 is completely pressed into the sample preparation cylinder 7, start the timer 5 and begin timing. When the timer 5 rings, it indicates that the pressing time is over, and then unload and remove the base 6, the sample preparation cylinder 7 and the first pressing block 11.

[0036] ③Second time of pressing: remove the first briquet 11, pour the second portion of soil into the sample preparation cylinder 7, and place the second briquet 12. Place the base 6, the sample preparation cylinder 7, and the second briquet 12 on the counterforce frame jack 3 according to the same steps as the first time of pressing, and start pressing. After the pressing is completed, remove the base 6, the sample preparation cylinder 7, and the second briquet 12.

[0037] ④Third time of pressing: remove the second briquet 12, pour the third portion of soil into the sample preparation cylinder 7, and place the third briquet 13. Similarly, continue pressing according to the above steps. When the pressing is completed, remove the base 6, the sample preparation cylinder 7, and the third briquet 13.

[0038] ⑤Soil sampling: remove the third briquet 13, move away the sample preparation cylinder 7, and then place the sampling cylinder 8 on the base 6, and place the sample preparation cylinder 7 into the sampling cylinder 8. After placing the soil pushing block 14, rotate the base 6, the sampling cylinder 8, the sample preparation cylinder 7, and the soil pushing block 14 by 180 degrees and place them back on the top block 321 of the jack 32. Start loading, and push the soil in the sample preparation cylinder 7 into the sampling cylinder 8.

[0039] ⑥Complete soil sampling: after the above steps are completed, the entire soil sampling process is completed. During the process, the size and time of the entire loading process are monitored and recorded in real time to ensure the accuracy of the entire sampling process.

[0040] By adopting the technical scheme, the precision soil sampling instrument can ensure uniform stress and standardization of the soil sample during preparation, avoid uneven pressure in the traditional pressing method, and ensure the representativeness and consistency of the soil sample. Meanwhile, the pressure sensor 4 and the timer 5 are provided to monitor the pressure change and time control during the pressing process in real time, so as to ensure the accuracy of the pressing load and avoid experimental errors caused by uneven pressure or improper control. In addition, the counterforce frame jack 3 makes the pressing process more uniform, and the height-adjustable function further optimizes the uniformity of the pressing, and the soil sample mold 1 is matched to ensure that the soil sample is not damaged by excessive stress during the entire preparation process.

[0041] Obviously, the above embodiments are only examples for clearly illustrating, and are not intended to limit the embodiments. For those skilled in the field, other different forms of changes or modifications can be made on the basis of the above description. Here, all the embodiments need not and cannot be exhausted. The obvious changes or modifications derived therefrom are still within the protection scope of the utility model.

Claims

1. A precision sample preparation instrument characterized by: The utility model provides a soil sample making device, which comprises a pressing device and a matched soil sample mold; the pressing device comprises a pressure sensor and a pressing counterforce frame jack; the soil sample mold comprises a sample making cylinder for making a soil sample, a sampling cylinder for taking out the soil sample in the sample making cylinder, a base for placing the sample making cylinder and the sampling cylinder, a first pressing block, a second pressing block, a third pressing block and a soil pushing block; the sample making cylinder and the sampling cylinder are both open-ended cylindrical pipes and serve as main molds for making the soil sample; the first pressing block, the second pressing block, the third pressing block and the soil pushing block all have cylindrical protrusions, and the sizes of the cylindrical protrusions are matched with the sample making cylinder.

2. A precision sample preparation instrument as claimed in claim 1, characterized in that The length of the sample making cylinder is the sample making height of the soil sample plus 50 mm; the length of the cylindrical protrusion of the first pressing block is 2 / 3 of the sample making height plus 50 mm; the length of the cylindrical protrusion of the second pressing block is 1 / 3 of the sample making height plus 50 mm; the length of the cylindrical protrusion of the third pressing block is 50 mm; and the length of the cylindrical protrusion of the soil pushing block is the same as the total length of the sample making cylinder.

3. A precision sample preparation instrument as in claim 1, wherein: The diameters of the cylindrical protrusions of the soil pushing block, the first pressing block, the second pressing block and the third pressing block are consistent with the pipe diameter of the sample making cylinder.

4. A precision sample preparation instrument as in claim 1, wherein: The pressing counterforce frame jack comprises a jack and a counterforce frame, and the jack is installed on the fixed base of the counterforce frame.

5. A precision sample preparation instrument as claimed in claim 4, characterized in that: The pressing device comprises a timer, and the timer is installed on the crossbeam of the counterforce frame.

6. A precision sample preparation instrument as claimed in claim 4, characterized in that: The counterforce frame can be adjusted in height.

7. A precision sample preparation instrument as in claim 1, wherein: The pressure sensor is fixed to the lower surface of the crossbeam of the counterforce frame; or the pressure sensor is freely placed outside and is placed at a detection position when used.

8. A precision sample preparation instrument as in claim 1, wherein: The upper surface of the base is provided with a circular groove, which is matched with the bottom surface shape of the sample making cylinder and the sampling cylinder.

9. A precision sample preparation instrument as claimed in claim 8, characterized in that: The top end of the sampling cylinder is provided with an annular placing groove, and the shape of the top end placing groove of the sampling cylinder is matched with the bottom surface shape of the sample making cylinder.

10. A precision sample preparation instrument as claimed in any one of claims 1 to 9, characterized in that: The diameter of the sampling cylinder is larger than that of the sample making cylinder.

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