Device for preparing soil sample with specific water content

Abstract

The utility model discloses a device for preparing a soil sample with specific water content. A sealing box is placed on a heating disc, a partition plate is arranged in the sealing box, a plurality of groups of weighing devices are arranged on the partition plate, a sealing cover is arranged at the top of the sealing box, the weighing devices and the heating disc are electrically connected with a PLC (Programmable Logic Controller) through wires, and a sodium chloride solution is contained in the lower part of the sealing box; the sodium chloride solution is evaporated in the sealing box, so that water vapor enters the soil sample to prepare the soil sample with the specific water content, the phenomena of non-uniform water content of the soil sample and insufficient water content accuracy of the soil sample caused by water volatilization are reduced, and the preparation precision of the soil sample is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of rock and soil mechanics tests, and in particular relates to a device for preparing soil samples with a specific water content. Background Art

[0002] In recent years, with the in-depth advancement of research on professional issues related to geotechnical mechanics, indoor experiments have become an important method for research advancement and theoretical verification. The preparation of geotechnical materials required for the experiment is a necessary part of the preliminary test preparation. The higher the accuracy of the experimental material preparation, the higher the possibility of the relevant experiment achieving the expected effect.

[0003] However, when soil mechanics experiments require the preparation of soil samples with a specific moisture content, manual mixing is often required. Although this method can obtain the final required soil sample, the accuracy of its moisture content cannot be guaranteed, and there is a large amount of interference from human factors during the preparation process.

[0004] At present, the preparation method of soil samples with specific moisture content is mainly manual mixing, that is, by calculating the amount of water required to add to dry soil, water and soil samples are gradually mixed manually in a certain container or sprayed with water by a sprayer to obtain soil samples with the required moisture content. There are the following defects:

[0005] (1) During the manual mixing process, soil samples are prone to uneven moisture content and water volatilization, which can easily lead to a decrease in the accuracy of the moisture content of the prepared soil samples. Manual mixing can also easily cause dust and pollute the experimental environment.

[0006] (2) The manual mixing method has a low degree of automation and low efficiency, which also increases the impact of human factors on the test. Summary of the invention

[0007] The technical problem to be solved by the utility model is to overcome the deficiencies of the above-mentioned prior art and provide a device for weighing soil samples through a weighing device and controlling a heating device to heat the sodium chloride solution at the bottom of the device so that water evaporates and enters the soil material, thereby making a soil sample with a specific moisture content.

[0008] The technical solution adopted to solve the above technical problems is: a device for preparing soil samples with specific moisture content, a sealed box is placed on a heating plate, a partition is provided inside the sealed box, several groups of weighing devices are provided on the partition, a sealing cover is provided on the top of the sealed box, and the weighing device and the heating plate are electrically connected to a PLC controller through wires.

[0009] The utility model has ventilation holes processed on the partition.

[0010] The weighing device of the utility model is composed of a waterproof electronic scale and a soil sample container. The soil sample container is placed on the waterproof electronic scale, a soil sample is placed in the soil sample container, and the waterproof electronic scale is electrically connected to a PLC controller.

[0011] The soil sample container of the utility model is made of transparent glass material.

[0012] The sealing box of the utility model has a conical structure at the bottom and a cylindrical structure at the top. The partition is arranged on the top of the conical structure. The conical structure is made of heat-conducting metal material, and the cylindrical structure is made of transparent glass material.

[0013] The utility model has a conical structure with a liquid inlet pipe arranged at the upper part and a liquid outlet pipe arranged at the lower part.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] (1) Different from the manual mixing method, the utility model adopts the method of evaporating sodium chloride solution in a sealed box to allow water vapor to enter the soil sample to prepare a soil sample with a specific moisture content, thereby alleviating the phenomenon of uneven moisture content of the soil sample and insufficient accuracy of the moisture content of the soil sample caused by water volatilization, and improving the accuracy of soil sample preparation.

[0016] (2) The utility model adopts a sealed preparation method, thereby avoiding the adverse effects of dust pollution on the laboratory environment during soil sample preparation.

[0017] (3) The preparation device of the utility model has a high degree of automation, which reduces labor costs and improves experimental efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0019] In the figure: 1. Sealing cover; 2. Sealing box; 3. Partition; 4. Heating plate; 5. PLC controller; 6. Waterproof electronic scale; 7. Soil sample container; 8. Soil sample. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to these embodiments.

[0021] Example 1

[0022] exist Figure 1In the present invention, a device for preparing a soil sample with a specific moisture content is provided. A sealed box 2 is placed on a heating plate 4. A sodium chloride solution is contained in the lower part of the sealed box 2. The sodium chloride solution in the sealed box 2 is heated by the heating plate 4 to volatilize it. A partition 3 is installed in the middle part of the sealed box. Several groups of weighing devices are placed on the partition 3. In order to allow the volatilized sodium chloride solution to enter the weighing device, air holes are processed on the partition 3. In order to ensure the sealing of the device, a sealing cover 1 is installed on the top of the sealed box 2. The lower part of the sealed box 2 of this embodiment is a conical structure, and the upper part is a cylindrical structure. The partition 3 is arranged on the top of the conical structure. The conical structure is made of a heat-conducting metal material and matches the heating plate 4 to conduct heat. The cylindrical structure is made of a transparent glass material, which is convenient for observing the reading of the waterproof electronic scale 6 and the moisture content of the soil sample. At the same time, in order to facilitate the entry and exit of the liquid, a liquid inlet pipe is arranged on the upper part of the conical structure and a liquid outlet pipe is arranged on the lower part. The weighing device is composed of a waterproof electronic scale 6 and a soil sample container 7. The soil sample container 7 is placed on the waterproof electronic scale 6. A soil sample 8 is placed in the soil sample container 7. In order to facilitate the observation of the water absorption of the soil sample, the soil sample container 7 is made of transparent glass. The waterproof electronic scale 6 is electrically connected to the PLC controller 5. The waterproof electronic scale 6 converts the weight of the soil sample 8 into a voltage signal and transmits it to the PLC controller 5. In actual application, the weight of the soil sample 8 when it reaches a certain moisture content is calculated in advance. The PLC controller 5 sets a threshold value according to the specific moisture content. First, the PLC controller 5 controls the heating plate 4 to heat. The sodium chloride liquid in the sealed box 2 evaporates and is absorbed by the soil sample 8. The weight of the soil sample 8 increases. The PLC controller 5 receives the signal transmitted by the waterproof electronic scale 6, compares it with the set threshold, and controls the heating plate 4 to stop heating after reaching the set threshold. The PLC controller 5, the waterproof electronic scale 6, and the heating plate 4 of this embodiment are all commercially available products.

Claims

1. A device for preparing soil samples with a specific moisture content, characterized in that: The sealed box (2) is placed on a heating plate (4), a partition (3) is arranged inside the sealed box (2), a plurality of weighing devices are arranged on the partition (3), a sealed cover (1) is arranged on the top of the sealed box (2), and the weighing device and the heating plate (4) are electrically connected to a PLC controller (5) via a wire.

2. The device for preparing a soil sample with a specific moisture content according to claim 1, characterized in that: The partition plate (3) is provided with air holes.

3. The device for preparing a soil sample with a specific moisture content according to claim 1, characterized in that: The weighing device is composed of a waterproof electronic scale (6) and a soil sample container (7). The soil sample container (7) is placed on the waterproof electronic scale (6), a soil sample (8) is placed in the soil sample container (7), and the waterproof electronic scale (6) is electrically connected to a PLC controller (5).

4. The device for preparing a soil sample with a specific moisture content according to claim 3, characterized in that: The soil sample container (7) is made of transparent glass material.

5. The device for preparing a soil sample with a specific moisture content according to claim 1, characterized in that: The sealing box (2) has a conical structure at the bottom and a cylindrical structure at the top. The partition (3) is arranged on the top of the conical structure. The conical structure is made of a heat-conducting metal material, and the cylindrical structure is made of a transparent glass material.

6. The device for preparing a soil sample with a specific moisture content according to claim 5, characterized in that: The upper part of the conical structure is provided with a liquid inlet pipe, and the lower part is provided with a liquid outlet pipe.

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