Soil column experiment device

Abstract

The utility model provides a soil column experimental device, which belongs to the technical field of experimental devices and comprises a soil column cylinder and a limit ring. The upper end of the soil column cylinder is an open end, and a plurality of liquid leakage holes are formed in the bottom wall of the soil column cylinder. The limiting ring is coaxially arranged in the soil column cylinder in a penetrating mode and fixedly attached to the inner side face of the soil column cylinder in the circumferential direction, and a gap is formed between the limiting ring and the top face of the soil column cylinder. According to the soil column experimental device provided by the utility model, a soil sample is filled into the soil column cylinder through the upper end of the soil column cylinder to form a soil column, the height of the soil sample in the soil column cylinder is lower than that of the limiting ring, and then a leaching experiment and ammonia volatilization determination can be performed, so that the problem that an existing soil column experimental device is relatively single in function is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of experimental devices, and more specifically relates to a soil column experimental device. Background Art

[0002] Soil column experiments are a laboratory method for simulating soil hydrological conditions and pollutant migration patterns. They are widely used in research fields such as agriculture, forestry, water conservancy, and the environment. Soil column experiments include greenhouse gas measurements, ammonia volatilization measurements, and leaching experiments. Existing soil column devices are limited in their functionality. For example, some soil column devices are only capable of performing leaching experiments, while others are limited to ammonia volatilization or greenhouse gas measurements. Utility Model Content

[0003] The purpose of the utility model is to provide a soil column experimental device, aiming to solve the problem that the existing soil column experimental device has relatively single functions.

[0004] To achieve the above objectives, the present invention employs a technical solution: providing a soil column experimental device comprising a soil column tube and a retaining ring. The soil column tube is arranged vertically, with an open upper end and a plurality of leakage holes provided on its bottom wall. The retaining ring is coaxially disposed within the soil column tube and circumferentially affixed to the inner side of the soil column tube, with a gap between the retaining ring and the top surface of the soil column tube.

[0005] In a possible implementation, the soil column experimental device further includes a supporting tube, which is coaxially arranged with the soil column tube and is used to support the soil column tube.

[0006] In a possible implementation, the soil column experimental device further includes a partition plate, which is located in the supporting tube and is circumferentially fixed to the inner side surface of the supporting tube to separate the supporting tube into a collection space above the partition plate.

[0007] In a possible implementation, the soil column experimental device further includes a plurality of limiting members, which are evenly distributed around the supporting tube and fixedly connected to the supporting tube, and the limiting members are slidably engaged with the outer side surface of the soil column tube.

[0008] In one possible implementation, the soil column experimental device further includes a water outlet pipe. The water outlet pipe is located below the partition plate, one end of the water outlet pipe is fixedly connected to the partition plate and communicates with the collection space, and the other end of the water outlet pipe penetrates the supporting tube so that it is located outside the supporting tube.

[0009] In one possible implementation, the soil column experimental device further includes a capping tube, an exhaust pipe, and a connecting valve. The lower end of the capping tube is an open end, and the capping tube is slidably sleeved on the outside of the upper end of the soil column tube through the lower end of the capping tube. One end of the exhaust pipe is located inside the capping tube, and the middle portion of the exhaust pipe penetrates the top wall of the capping tube and is fixedly connected to the top wall of the capping tube. The connecting valve is connected to the end of the exhaust pipe located outside the capping tube.

[0010] In a possible implementation, the soil column experimental device further includes a sealing groove, the opening of which faces upward, the bottom wall of which is sleeved and fixed outside the soil column tube, and is used to support the capping tube.

[0011] In a possible implementation, the connecting valve is a three-way valve, and one of the branches of the connecting valve is connected to an end of the air extraction pipe located outside the capping cylinder.

[0012] In one possible implementation, the soil column experimental device further includes a temperature sensor. The temperature sensor includes a temperature sensing element, a display, and a wiring harness. The temperature sensing element is located within the capping cylinder, the display is located outside the capping cylinder and is fixedly connected to the capping cylinder, and the wiring harness penetrates the capping cylinder and is fixedly connected to the capping cylinder. The ends of the wiring harness are electrically connected to the temperature sensing element and the display, respectively.

[0013] In a possible implementation, the soil column experimental device further includes a disturbance fan, the fan body of which is located in the cover cylinder, and a power line of the disturbance fan penetrates the cover cylinder and is fixedly connected to the cover cylinder.

[0014] In the embodiment of the present application, a soil column is formed by filling a soil sample into the soil column through the upper end of the soil column tube, and the height of the soil sample in the soil column tube is lower than the limiting ring. In this way, ultrapure water can be added to the soil column tube through the upper end of the soil column tube, and the liquid formed after the ultrapure water penetrates the soil sample falls from the leakage hole. The liquid falling from the leakage hole is collected and analyzed, thereby completing the leaching experiment; a sponge can also be inserted into the soil column tube, and the sponge is covered on the limiting ring. Another sponge is covered on the upper end surface of the soil column tube. Both sponges contain a solution that can absorb ammonia. The sponge on the limiting ring is used to absorb ammonia volatilized from the soil sample. The sponge on the soil column tube can prevent ammonia in the outside air from being absorbed by the sponge on the limiting ring. After a period of time, the sponge on the limiting ring is removed from the soil column tube and analyzed, thereby completing the ammonia volatilization measurement. In summary, this experimental device can perform leaching experiments and ammonia volatilization measurements, thereby avoiding the problem that the existing soil column experimental device has relatively single functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 A schematic diagram of the axonometric structure of a soil column experimental device provided in an embodiment of the present utility model;

[0017] Figure 2 for Figure 1 Schematic diagram of the enlarged structure of local A in FIG;

[0018] Figure 3 A schematic diagram of the axonometric cross-sectional structure of a soil column experimental device provided by an embodiment of the present utility model;

[0019] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of the local B in FIG;

[0020] Figure 5 for Figure 3 Schematic diagram of the enlarged structure of the local C in FIG;

[0021] Figure 6 A schematic diagram of the axonometric structure of the soil column experimental device provided by an embodiment of the present invention after the support tube and some components are connected;

[0022] Figure 7 This is a schematic diagram of the axonometric structure of the soil column experimental device provided by an embodiment of the present invention after the sealing cylinder and some components are connected.

[0023] In the figure: 1. Soil column; 11. Leakage hole; 2. Limiting ring; 3. Supporting tube; 31. Collection space; 4. Partition plate; 5. Limiting piece; 6. Water outlet pipe; 7. Covering cylinder; 8. Exhaust pipe; 9. Connecting valve; 91. First branch; 92. Second branch; 10. Sealing groove; 110. Temperature sensor; 1101. Temperature sensing element; 1102. Display; 1103. Wiring harness; 120. Disturbance fan; 1201. Fan body; 1202. Power cord. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is 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 the present invention and are not intended to limit the present invention.

[0025] It should be further explained that the drawings and implementation methods of the present invention mainly describe the concept of the present invention. On the basis of this concept, some connection relationships, positional relationships, power mechanisms, power supply systems, hydraulic systems and control systems, etc. The specific forms and settings may not be fully described. However, on the premise that those skilled in the art understand the concept of the present invention, those skilled in the art can implement the above-mentioned specific forms and settings in a familiar manner.

[0026] When an element is referred to as being “fixed to” or “disposed on” another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it can be directly connected to the other element or indirectly connected to the other element.

[0027] The directions or positional relationships indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, and "several" means one or more, unless otherwise specifically defined.

[0029] Please also refer to Figure 1 、 Figure 3 and Figure 5 The soil column experimental device provided by the present invention is now described. The soil column experimental device comprises a soil column tube 1 and a limiting ring 2. The soil column tube 1 is vertically arranged, the upper end of the soil column tube 1 is an open end, and a plurality of leakage holes 11 are provided on the bottom wall of the soil column tube 1. The limiting ring 2 is coaxially arranged in the soil column tube 1 and is circumferentially fixed to the inner side surface of the soil column tube 1, and there is a gap between the limiting ring 2 and the top surface of the soil column tube 1.

[0030] Compared with the prior art, the soil column experimental device provided by the present invention forms a soil column by filling a soil sample into the soil column tube 1 through the upper end of the soil column tube 1. The height of the soil sample in the soil column tube 1 is lower than the limiting ring 2. In this way, ultrapure water can be added to the soil column tube 1 through the upper end of the soil column tube 1. Liquid formed after the ultrapure water permeates the soil sample falls through the leakage hole 11. The liquid falling through the leakage hole 11 is collected and analyzed, thereby completing the leaching experiment. A sponge can also be inserted into the soil column tube 1, the sponge covering the limiting ring 2, and another sponge covering the upper end surface of the soil column tube 1. Both sponges contain a solution capable of absorbing ammonia. The sponge on the limiting ring 2 is used to absorb ammonia volatilized from the soil sample. The sponge on the soil column tube 1 can prevent ammonia in the outside air from being absorbed by the sponge on the limiting ring 2. After a period of time, the sponge on the limiting ring 2 is removed from the soil column tube 1 and analyzed, thereby completing the ammonia volatilization measurement. In summary, this experimental device can carry out leaching experiments and ammonia volatilization measurements, thus avoiding the problem of the existing soil column experimental device having relatively single functions.

[0031] In some embodiments, see Figure 1 and Figure 3 The soil column experimental device further includes a supporting tube 3. The supporting tube 3 is coaxially arranged with the soil column tube 1 and is used to support the soil column tube 1. By supporting the soil column tube 1 with the supporting tube 3, the liquid falling from the leakage hole 11 can fall into the supporting tube 3.

[0032] In this embodiment, the inner diameter of the supporting tube 3 is equal to the inner diameter of the soil column 1 , and the outer diameter of the supporting tube 3 is equal to the outer diameter of the soil column 1 .

[0033] In some embodiments, see Figure 3 and Figure 6 The soil column experimental apparatus also includes a partition plate 4. The partition plate 4 is located within the support tube 3 and is circumferentially secured to the inner side of the support tube 3, thereby separating the support tube 3 from a collection space 31 located above the partition plate 4. The collection space 31 collects liquid that falls from the leakage hole 11.

[0034] In some embodiments, see Figure 1 and Figure 6 The soil column experimental device also includes multiple stoppers 5. These stoppers 5 are evenly distributed around the support tube 3 and are fixedly connected to the support tube 3. The stoppers 5 slide in contact with the outer surface of the soil column 1. The multiple stoppers 5 restrain the soil column 1, preventing it from falling off the support tube 3. Once the soil column 1 slides free of the stoppers 5, the collection space 31 can be easily cleaned.

[0035] In some embodiments, see Figure 3The soil column experimental apparatus also includes a water outlet pipe 6. This pipe is located below the partition plate 4. One end of the pipe is fixedly connected to the partition plate 4 and communicates with the collection space 31. The pipe penetrates the support tube 3, with the other end of the pipe located outside the support tube 3. Liquid in the collection space 31 flows into the pipe 6 and then out of the end of the pipe located outside the support tube 3. A container, such as a bottle, can be placed at the end of the pipe located outside the support tube 3 to collect the liquid flowing out of the pipe 6.

[0036] In some embodiments, see Figure 1 、 Figure 2 、 Figure 3 and Figure 7 The soil column experimental device also includes a covering tube 7, an exhaust pipe 8 and a connecting valve 9. The lower end of the covering tube 7 is an open end, and the covering tube 7 is slidably mounted on the outside of the upper end of the soil column tube 1 through the lower end of the covering tube 7. One end of the exhaust pipe 8 is located inside the covering tube 7, and the middle part of the exhaust pipe 8 penetrates the top wall of the covering tube 7 and is fixedly connected to the top wall of the covering tube 7. The connecting valve 9 is connected to the end of the exhaust pipe 8 located outside the covering tube 7. When the covering tube 7 slides out of the soil column tube 1, leaching experiments and ammonia volatilization measurements can be carried out. When a soil sample is placed in the soil column tube 1 and the covering tube 7 is slidably mounted outside the soil column tube 1, the gas in the space enclosed by the soil column tube 1 and the covering tube 7 can be extracted through the connecting valve 9, and then the extracted gas can be detected to measure the greenhouse gases volatilized from the soil, and then complete the greenhouse gas measurement, thereby further increasing the function of the device.

[0037] In this embodiment, the exhaust pipe 8 can be fixedly connected to the top wall of the capping cylinder 7 by glue, so that the seal between the exhaust pipe 8 and the top wall of the capping cylinder 7 can also be ensured.

[0038] In some embodiments, see Figure 1 and Figure 3 The soil column experimental device also includes a sealing groove 10. The notch of the sealing groove 10 faces upward, and the bottom wall of the sealing groove 10 is fixedly mounted on the outside of the soil column tube 1. The bottom wall of the sealing groove 10 is used to support the capping tube 7. Water is added to the sealing groove 10 to form a water seal, thereby ensuring the seal between the capping tube 7 and the soil column tube 1.

[0039] In some embodiments, see Figure 3 and Figure 7, the connecting valve 9 adopts a three-way valve, and one of the branches of the connecting valve 9 is connected to the end of the exhaust pipe 8 located outside the sealing tube 7. In this embodiment, the branch of the connecting valve 9 used to communicate with the exhaust pipe 8 is the first branch 91, and the other two branches of the connecting valve 9 are the second branches 92. The two second branches 92 are respectively used to connect with the two exhaust components. When in use, first, the first branch 91 is connected to one of the second branches 92, and the exhaust component connected to the second branch 92 is used to extract the original gas in the exhaust pipe 8; then the first branch 91 is connected to the other second branch 92, and then the exhaust component connected to the second branch 92 extracts the gas, and the extracted gas is subjected to greenhouse gas measurement. In this way, it is possible to avoid the original gas in the exhaust pipe 8 affecting the accuracy of the greenhouse gas measurement.

[0040] Furthermore, the gas extraction component can be a syringe. During the entire greenhouse gas measurement cycle, the gas is collected every 10 minutes, for a total of 5 times.

[0041] In some embodiments, see Figure 3 and Figure 7 When measuring greenhouse gases, it is also necessary to know the ambient temperature of the soil sample. The soil column experimental device also includes a temperature sensor 110. The temperature sensor 110 includes a temperature sensing element 1101, a display 1102 and a wiring harness 1103. The temperature sensing element 1101 is located inside the capping tube 7, the display 1102 is located outside the capping tube 7 and is fixedly connected to the capping tube 7, the wiring harness 1103 penetrates the capping tube 7 and is fixedly connected to the capping tube 7, and the two ends of the wiring harness 1103 are electrically connected to the temperature sensing element 1101 and the display 1102 respectively. The temperature sensing element 1101 senses the temperature in the space enclosed by the capping tube 7 and the soil column tube 1, and transmits the temperature value to the display 1102 through the wiring harness 1103. The operator knows the ambient temperature of the soil sample through the display 1102. In this embodiment, the wiring harness 1103 can penetrate the top wall of the capping tube 7 and be fixedly connected to the top wall of the capping tube 7.

[0042] In some embodiments, see Figure 3 、 Figure 4 and Figure 7The soil column experimental device also includes a disturbance fan 120. The fan body 1201 of the disturbance fan 120 is located in the covering tube 7, and the power cord 1202 in the disturbance fan 120 penetrates the covering tube 7 and is fixedly connected to the covering tube 7. The power cord 1202 is electrically connected to the external power supply. After the disturbance fan 120 is started, the original gas in the space enclosed by the covering tube 7 and the soil column tube 1 can be evenly mixed with the gas volatilized by the soil sample, so that the accuracy of greenhouse gas measurement can be increased. In this embodiment, the power cord 1202 can penetrate the top wall of the covering tube 7 and be fixedly connected to the top wall of the covering tube 7. The fan body 1201 can also be fixedly connected to the top wall of the covering tube 7.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Soil column experimental device, characterized in that: include: A soil column is vertically arranged, the upper end of the soil column is an open end, and a plurality of leakage holes are provided on the bottom wall of the soil column; as well as A limiting ring is coaxially arranged in the soil column and is circumferentially fitted and fixed to the inner side surface of the soil column, and a gap is provided between the limiting ring and the top surface of the soil column.

2. The soil column experimental device according to claim 1, characterized in that: Also includes: The supporting tube is coaxially arranged with the soil column and is used for supporting the soil column.

3. The soil column experimental device according to claim 2, characterized in that: Also includes: The partition plate is located in the supporting tube and is circumferentially fitted and fixed to the inner side surface of the supporting tube to separate the supporting tube into a collection space located above the partition plate.

4. The soil column experimental device according to claim 2, characterized in that: Also includes: A plurality of limiting members are evenly distributed around the supporting tube and fixedly connected to the supporting tube, and the limiting members are slidably fitted with the outer side surface of the soil column.

5. The soil column experimental device according to claim 3, characterized in that: Also includes: The water outlet pipe is located below the partition plate, one end of the water outlet pipe is fixedly connected to the partition plate and communicated with the collection space, and the water outlet pipe penetrates the supporting tube so that the other end of the water outlet pipe is located outside the supporting tube.

6. The soil column experimental device according to claim 1, characterized in that: Also includes: A covering cylinder, the lower end of which is an open end, and the covering cylinder is slidably sleeved on the outer side of the upper end of the soil column cylinder through the lower end of the covering cylinder; an air extraction pipe, one end of which is located in the capping cylinder, and a middle portion of which penetrates the top wall of the capping cylinder and is fixedly connected to the top wall of the capping cylinder; A connecting valve is connected to one end of the air extraction pipe located outside the sealing cylinder.

7. The soil column experimental device according to claim 6, characterized in that: Also includes: The sealing groove has a groove opening facing upwards, and the bottom wall of the sealing groove is sleeved and fixed outside the soil column tube, and the bottom wall of the sealing groove is used to support the sealing tube.

8. The soil column experimental device according to claim 6, characterized in that: The connecting valve is a three-way valve, and one of the branches of the connecting valve is connected to one end of the air extraction pipe located outside the sealing cylinder.

9. The soil column experimental device according to claim 6, characterized in that: Also includes: The temperature sensor includes a temperature sensing element, a display and a wiring harness. The temperature sensing element is located inside the capping cylinder, the display is located outside the capping cylinder and is fixedly connected to the capping cylinder, the wiring harness penetrates the capping cylinder and is fixedly connected to the capping cylinder, and the two ends of the wiring harness are electrically connected to the temperature sensing element and the display respectively.

10. The soil column experimental device according to claim 6, characterized in that: Also includes: A disturbance fan, wherein the fan body is located in the cover cylinder, and a power line in the disturbance fan penetrates the cover cylinder and is fixedly connected to the cover cylinder.

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