A drying cartridge for radiantly heating a soil sample

Abstract

The present application relates to the technical field of soil sample preparation, and particularly relates to a cylinder for drying soil samples. The present application discloses a drying cylinder for radiantly heating soil samples. The drying cylinder is a closed cylinder made of light-transmitting material. During operation, the drying cylinder rotates and is in a negative pressure state, so as to accelerate water evaporation and improve drying speed. Meanwhile, the drying cylinder is provided with a radiative heating device outside the cylinder to heat the samples in the cylinder, so as to eliminate the rapid reduction of sample temperature caused by the absorption of heat when the volume of gas in the cylinder expands due to negative pressure. The samples in the cylinder are maintained in a reasonable interval between normal room temperature and the upper limit of the required temperature for soil sample preparation, so as to ensure the drying efficiency of the samples. The present application realizes the automatic drying of soil samples, adopts a rotary heating mode, and makes the soil samples evenly heated, so that the soil samples can quickly and efficiently reach the required drying degree, thereby shortening the sample preparation period, saving the sample preparation area, and improving the sample preparation efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of soil sample preparation, in particular to a cylinder for drying soil samples. BACKGROUND

[0002] Soil sample preparation refers to the process of mixing, drying, grinding and sieving after the soil sample is collected from the field. After the soil sample collected from the field is transported to the laboratory, in order to avoid the mold deterioration caused by the action of microorganisms, all the soil samples should be placed in a wooden drying tray immediately, spread into a thin layer of 2-3cm, and remove the mixed bricks, stones, lime nodules, root stems and plant residues in the soil in a semi-dry state. The soil should be crushed in time with a wooden stick, and the soil should be turned frequently and placed in a cool place to dry slowly. Direct sunlight and high temperature should be avoided. The drying place should be prevented from being polluted by acid, alkali and dust. The traditional drying method is greatly affected by natural factors such as climate, season and weather, resulting in a long sample preparation period, a large amount of sample accumulation, a large occupation area and a low sample preparation efficiency. SUMMARY

[0003] The purpose of the present application is to improve the preparation efficiency of dried soil samples, and provide a cylinder for drying soil samples.

[0004] The technical scheme of the present application is: a drying cylinder for radiating and heating soil samples, the drying cylinder is a closed cylinder made of light-transmitting material, during operation, the drying cylinder rotates by itself and the inside is in a negative pressure state, and the outside of the drying cylinder is provided with a radiating heating device to heat the samples in the drying cylinder.

[0005] The working principle is that the drying cylinder rotates by itself and the inside is in a negative pressure state, which can accelerate the evaporation of water and improve the drying speed. At the same time, the radiating heating device can eliminate the rapid reduction of the temperature of the samples caused by the absorption of heat when the volume of the gas in the cylinder expands due to the negative pressure, so as to maintain the samples in the drying cylinder within a reasonable range of normal room temperature and the upper limit of the temperature required for soil sample preparation, and ensure the drying efficiency of the samples.

[0006] Specifically, the structure of the drying cylinder comprises: a cylinder and at least one bucket cover; the bucket cover is used for sealing the cylinder; the bucket cover is provided with an air extraction hole for communicating with an air extraction device; the material of the drying cylinder is quartz or high borosilicate;

[0007] The radiating heating device is a heating rod capable of generating infrared light waves.

[0008] On the basis of the above-mentioned scheme, further, one or more grids are arranged on the inner wall of the cylinder; during the rotation of the drying cylinder, the grids are used to loosen the soil samples, so as to improve the drying speed.

[0009] In order to monitor the environment in the drying cylinder in real time during the drying process, a humidity sensor, an air pressure sensor and a temperature sensor are arranged in the cylinder body.

[0010] In order to ensure that the original components of the soil sample in the drying cylinder are not lost during the sample preparation process, an adsorption device filled with adsorption material is connected in series on the connecting pipeline between the air extraction hole and the air extraction device; the adsorption device is filled with activated carbon or modified composite material, which is used for adsorbing volatile organic compounds in the soil sample, or volatile inorganic elements such as mercury and arsenic, and the adsorbed substances are backfilled into the soil sample after the drying is completed.

[0011] In order to realize the automatic lifting and lowering of the drying cylinder, the drying cylinder and the radiation heating device are installed on the lifting plate.

[0012] In order to facilitate the taking and placing of the soil sample in the cylinder body, bearing seat assemblies are arranged on the left and right sides of the lifting plate, and the bearing seat assemblies are connected with the peripheral rotating mechanism; when the soil sample is taken and placed, the drying cylinder is raised or lowered by a certain angle through the rotating mechanism.

[0013] Beneficial effects: The present application realizes the automatic drying of the soil sample, adopts the rotary heating mode, makes the soil sample evenly heated, can monitor the environment in the barrel in real time through the setting of the sensor during the drying process, quickly and efficiently makes the soil sample reach the required drying degree, thereby shortens the sample preparation period, saves the sample preparation area, and improves the sample preparation efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present application;

[0015] Figure 2 It is a structural schematic diagram of the drying cylinder in Example 1;

[0016] Figure 3 It is a structural schematic diagram of the present application in Example 2;

[0017] Figure 4 It is a structural schematic diagram of the present application in Example 3.

[0018] Wherein: 1-drying cylinder, 11-cylinder body, 12-barrel cover, 13-grating, 2-radiation heating device, 3-lifting plate, 4-bearing seat assembly, 5-adsorption device. DETAILED DESCRIPTION

[0019] The present application will be described in detail below in combination with the drawings and examples.

[0020] Example 1: refer to the attached Figure 1The application discloses a drying cylinder for radiative heating of soil samples, wherein the drying cylinder 1 is a closed cylinder body made of a light-transmitting material; during operation, the drying cylinder 1 rotates by itself and is in a negative pressure state, and the radiative heating device 2 is arranged outside the drying cylinder 1 to heat the sample in the drying cylinder 1.

[0021] In the example, the drying cylinder 1 is made of quartz or high borosilicate, and the radiative heating device 2 is a heating rod capable of generating infrared light waves.

[0022] Referring to the accompanying drawings Figure 2 The specific structure of the drying cylinder 4 comprises the cylinder body 11 and at least one barrel cover 12; the barrel cover 12 is used for sealing the cylinder body 11, a sealing ring is arranged at the contact position of the barrel cover 12 and the cylinder body 11, and the barrel cover 12 is provided with an air extraction hole used for being communicated with an air extraction device. The rotation of the drying cylinder 1 can be realized by means of cooperation of a supporting roller and a transmission chain wheel or a belt transmission or by means of other modes such as a rotating motor.

[0023] Further, in order to monitor the environment in the drying cylinder in real time during the drying process, a humidity sensor, an air pressure sensor and a temperature sensor are arranged in the cylinder body 11. During operation, the moist soil is put into the drying cylinder 1, the drying cylinder 1 is subjected to air extraction treatment, and the vacuum degree in the barrel is less than or equal to -0.095 MPa; then the drying cylinder 1 is subjected to rotating heating, and the heating temperature is not higher than 40 DEG C; when the humidity sensor in the drying cylinder 1 monitors that the humidity is less than 5%, the rotating heating is stopped.

[0024] Further, one or more grids 13 are arranged on the inner wall of the cylinder body 11, and the soil sample is loosened by means of the grids 13 during the rotation of the drying cylinder, so that the drying speed is improved.

[0025] Embodiment 2: Referring to the accompanying drawings Figure 3 On the basis of the embodiment 1, further, in order to ensure that the original components of the soil sample in the drying cylinder 1 are not lost during the sample preparation process, an adsorption device 5 filled with adsorption material is connected in series on the connecting pipeline between the air extraction hole and the air extraction device; the adsorption device 5 is filled with activated carbon or modified composite material and is used for adsorbing volatile organic matters in the soil sample or easily-volatilized inorganic elements such as mercury and arsenic, and the adsorbed matters are backfilled into the soil sample after the drying is completed.

[0026] Embodiment 3: Referring to the accompanying drawings Figure 4 In order to realize the rising and falling of the drying cylinder 1, on the basis of the embodiment 1 or 2, the drying cylinder 1 and the radiative heating device 2 are installed on the lifting plate 3; in the example, the lifting plate 3 realizes the rising and falling in the mode of a slide and a push rod.

[0027] Further, in order to facilitate the taking and placing of the soil sample in the drying cylinder 1, bearing seat assemblies 4 are arranged on the left and right sides of the lifting plate 3, and the bearing seat assemblies 4 are connected with the peripheral rotating mechanism. When the soil sample is taken and placed, the rotating mechanism is used to lift or lower the drying cylinder 1 and the radiant heating device 2 by a certain angle.

[0028] To sum up, the above is only a preferred embodiment of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method of preparing a dried soil sample by drying a soil sample by radiant heating using a drying drum, characterised in that: The drying cylinder (1) is a closed cylinder made of light-transmitting material, which rotates and has a negative pressure inside during operation, and is provided with a radiation heating device (2) outside. The drying cylinder (1) comprises a cylinder body (11) and at least one barrel cover (12), the barrel cover (12) is used for sealing the cylinder body (11), and the barrel cover (12) is provided with an air extraction hole for communicating with an air extraction device; An adsorption device (5) filled with adsorption material is connected in series on the connecting pipeline between the air extraction hole and the air extraction device, the adsorption device is provided with activated carbon or modified composite material, and is used for adsorbing volatile organic compounds or volatile inorganic elements in the soil sample; The cylinder body (11) is provided with a humidity sensor, an air pressure sensor and a temperature sensor; The method comprises the following steps: Put the wet soil into the drying cylinder (1), and perform air extraction treatment on the drying cylinder (1) to make the vacuum degree in the drying cylinder (1) less than or equal to -0.095 MPa; Then, the drying cylinder (1) is rotated and heated, and the heating temperature is not more than 40℃; When the humidity sensor in the drying cylinder (1) monitors that the humidity is less than 5%, the rotation and heating are stopped, After the drying is completed, the adsorbed substances are backfilled into the soil sample to obtain the dried soil sample.

2. The method of claim 1, wherein: The material of the drying cylinder (1) is quartz or high borosilicon.

3. The method of claim 1, wherein: The radiation heating device (2) is a heating rod capable of generating infrared light waves.

4. The method of claim 1, wherein: The inner wall of the cylinder body (11) is provided with one or more grids (13).

5. The method of claim 1, wherein: The drying cylinder (1) and the radiation heating device (2) are installed on a lifting plate (3).

6. The method of claim 5, wherein: The left and right sides of the lifting plate (3) are provided with bearing seat assemblies (4), and the bearing seat assemblies (4) are connected with a peripheral rotating mechanism.

Images