Leaching device

Abstract

The utility model provides a leaching device. The leaching device comprises a base and a leaching tank, the column body is arranged on the base, the column body is provided with a cavity, the column body is provided with a liquid inlet and a liquid outlet which are oppositely arranged, the liquid inlet and the liquid outlet are communicated with the cavity, the liquid inlet is formed in the top of the column body, the liquid outlet is formed in the bottom of the column body, and the cavity is used for being filled with soil; the cover body is arranged at the top of the column body, the cover body seals the liquid inlet, the cover body is provided with a liquid collecting cavity, the liquid collecting cavity is communicated with the cavity through the liquid inlet, the top of the cover body is of a curved surface structure, and the curved surface structure is used for collecting water vapor evaporated in the cavity. According to the technical scheme, the problem that a leaching device in the prior art is large in test error can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of soil testing devices, in particular to a leaching device. Background Art

[0002] Leaching test is a soil chemical analysis method, which is mainly used to study the leaching of soluble salts and other chemicals in the soil. When researchers study the vertical migration of various ions or groups in the soil, they need to design and carry out leaching tests according to different research purposes.

[0003] In the prior art, the experiment is usually conducted directly in the field: it is necessary to bury underground pipes to collect the leaching solution, and to enclose the soil of each test plot to prevent the leaching solution from being lost with underground runoff. Although such field experiments can reflect the actual situation in the field, the research time span is long, the work intensity is high, and a large amount of manpower, material resources and energy are required. In addition, the experimental device has a complex structure and is difficult to operate. The soil is greatly disturbed during leaching and the leaching solution is lost to a large extent, resulting in large errors in the test results. Utility Model Content

[0004] The utility model provides a leaching device to solve the problem of large test error of the leaching device in the prior art.

[0005] The utility model provides a leaching device, which comprises: a base; a column, which is arranged on the base, the column has a cavity, the column has a liquid inlet and a liquid outlet which are arranged relatively, the liquid inlet and the liquid outlet are connected with the cavity, the liquid inlet is arranged at the top of the column, the liquid outlet is arranged at the bottom of the column, and the cavity is used to fill soil; a cover body, which is arranged at the top of the column, the cover body closes the liquid inlet, the cover body has a liquid collecting cavity, the liquid collecting cavity is connected with the cavity through the liquid inlet, and the top of the cover body is a curved surface structure, and the curved surface structure is used to collect water vapor evaporated in the cavity.

[0006] Furthermore, the cover body includes a sealing part and a connecting part connected to each other, the connecting part is connected to the column, the sealing part and the connecting part cooperate to form a receiving cavity, the sealing part is located on the side of the connecting part away from the column, the top of the sealing part closes the liquid inlet, and the cross-section of the top of the sealing part in the horizontal direction gradually increases toward the liquid inlet. Through the above arrangement, the top of the sealing part can intercept the leachate while the side wall of the sealing part can also form an inclined surface, thereby guiding the leachate condensed on the top of the sealing part, so that the condensed leachate is quickly gathered along the side wall of the sealing part and flows back to the soil in the column.

[0007] Furthermore, the connecting portion includes a liquid collecting plate, which is arranged in the connecting portion and covers the liquid inlet, and the liquid collecting plate has an opening, which is connected to the liquid inlet, and the aperture of the opening is smaller than the aperture of the liquid inlet. Through the above arrangement, the connecting portion is connected to the sealing portion, and the liquid collecting plate can collect the condensed eluent on the side wall of the sealing portion, so that the evaporated eluent can be collected more effectively.

[0008] Furthermore, a liquid absorbing material is provided in the liquid collecting cavity, the liquid absorbing material is placed on the liquid collecting plate, and the liquid absorbing material covers the opening. Through the above arrangement, the liquid absorbing material can intercept the evaporated water vapor or shower liquid in the cavity, reducing the error in the subsequent calculation of the volume of the shower liquid.

[0009] Furthermore, the sealing part and the connecting part are detachably connected via the connecting structure. The above arrangement facilitates installation and removal of the sealing part and the connecting part.

[0010] Furthermore, the side wall of the sealing part has a first thread structure, and the side wall of the connecting part has a second thread structure, and the first thread structure cooperates with the second thread structure to form a connecting structure. Through the above arrangement, the sealing part and the connecting part are connected by the thread structure, the structure is simple, and the production cost of the device is saved.

[0011] Furthermore, the leaching device also has a liquid outlet pipe, which is connected to the liquid outlet, and a switch valve is arranged on the liquid outlet pipe. Through the above arrangement, the opening and closing of the liquid outlet pipe can be controlled by the switch valve, so that the substances soluble in the leaching solution in the soil in the column are discharged from the liquid outlet to the collection device through the liquid outlet, and the chemical composition of the outflowing leaching solution is detected and analyzed.

[0012] Furthermore, a third thread structure is provided on the side wall of the connecting part close to one end of the column, and a fourth thread structure is provided on the side wall of the column, and the third thread structure is connected with the fourth thread structure in cooperation. Through the above arrangement, the connecting part and the column are connected through the thread structure, which facilitates the assembly and disassembly of the connecting part and the column.

[0013] Furthermore, the base includes a mounting plate and a plurality of supporting legs, the column is passed through the mounting plate, the plurality of supporting legs are used to support the mounting plate, and the liquid outlet is spaced from the bottom of the supporting legs. Through the above arrangement, the reliability of the base supporting the column can be ensured.

[0014] Furthermore, the column is made of transparent material. Through the above arrangement, it is convenient to observe the state of the soil inside the column at any time.

[0015] By applying the technical solution of the utility model, a cover body is arranged on the top of the column, and the cover body can be closed together with the liquid inlet to prevent the leaching solution evaporated from the cavity from dispersing through the liquid inlet during the leaching experiment, so as to ensure that the leaching solution emitted and lost in the column will not overflow and be lost. At the same time, the liquid collecting cavity is connected to the cavity, and the top of the cover body is a curved surface structure. The curved surface structure is conducive to the condensation and flow of the leaching solution, enhances the condensation efficiency, and facilitates the collection of the leaching solution. Through the above arrangement, after adding a fixed volume of leaching solution before the start of the experiment, the leaching solution dispersed from the soil during the experiment can condense on the curved cover body, and then flow back to the soil in the cavity through the liquid inlet, which can minimize the volume loss rate of the leaching solution, thereby reducing the error of the experiment and improving the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 The schematic diagram of the structure of the leaching device provided by the utility model is shown;

[0018] Figure 2 The structure schematic diagram of the sealing part provided by the utility model is shown;

[0019] Figure 3 The schematic diagram of the structure of the connecting part provided by the utility model is shown;

[0020] Figure 4 The schematic diagram of the structure of the liquid outlet pipe provided by the utility model is shown.

[0021] The above drawings include the following reference numerals:

[0022] 10. Base;

[0023] 11. Mounting plate; 12. Support legs;

[0024] 20. Column;

[0025] 21. Cavity; 23. Liquid outlet;

[0026] 24. Scale;

[0027] 30. Cover body; 31. Liquid collecting chamber;

[0028] 32. Sealing portion; 321. First thread structure;

[0029] 33. Connecting portion; 331. Liquid collecting plate; 332. Opening; 333. Second thread structure; 334. Third thread structure;

[0030] 34. Handle;

[0031] 40. Liquid outlet pipe;

[0032] 41. Switch valve. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0034] like Figure 1 As shown, the embodiment of the utility model provides a leaching device, which includes: a base 10, a column 20 and a cover 30. The column 20 is arranged on the base 10, and the column 20 has a cavity 21. The column 20 has a liquid inlet and a liquid outlet 23 arranged opposite to each other, and the liquid inlet and the liquid outlet 23 are connected to the cavity 21. The liquid inlet is arranged at the top of the column 20, and the liquid outlet 23 is arranged at the bottom of the column 20. The cavity 21 is used to fill soil. The cover 30 is arranged at the top of the column 20, and the cover 30 closes the liquid inlet. The cover 30 has a liquid collecting cavity 31, and the liquid collecting cavity 31 is connected to the cavity 21 through the liquid inlet. The top of the cover 30 is a curved surface structure, and the curved surface structure is used to collect the evaporated water vapor in the cavity 21.

[0035] By applying the technical solution of the utility model, a cover 30 is arranged on the top of the column 20, and the cover 30 can be closed with the liquid inlet to prevent the water vapor or leaching solution evaporated from the cavity 21 from escaping through the liquid inlet during the leaching experiment, so as to ensure that the water vapor or leaching solution emitted and lost in the column 20 will not overflow and be lost. At the same time, the liquid collecting cavity 31 is connected with the cavity 21, and the top of the cover 30 is a curved surface structure, which is conducive to the condensation and flow of the leaching solution, enhances the condensation efficiency, and is convenient for collecting water vapor or leaching solution. Through the above arrangement, after adding a quantitative volume of leaching solution before the start of the experiment, the water vapor or leaching solution emitted from the soil during the experiment can condense on the curved cover 30, and then flow back to the soil in the cavity 21 through the liquid inlet, which can minimize the volume loss rate of the leaching solution, thereby reducing the error of the experiment and improving the accuracy of the test results.

[0036] Specifically, the cover 30 includes a sealing portion 32 and a connecting portion 33 connected to each other, the connecting portion 33 is connected to the column 20, and the sealing portion 32 and the connecting portion 33 cooperate to form a liquid collecting chamber 31, the sealing portion 32 is located on the side of the connecting portion 33 away from the column 20, the top of the sealing portion 32 closes the liquid inlet, and the cross-section of the top of the sealing portion 32 in the horizontal direction gradually increases toward the direction close to the liquid inlet. Through the above arrangement, the top of the sealing portion 32 can intercept water vapor or leachate, and the cross-section of the top of the sealing portion 32 in the horizontal direction gradually increases toward the direction close to the liquid inlet, so that the side wall of the sealing portion 32 can also form an inclined surface, and then the leachate condensed on the top of the sealing portion 32 can be diverted, so that the condensed leachate is quickly gathered along the side wall of the sealing portion 32 and flows back to the soil in the column 20.

[0037] In this embodiment, the top of the sealing portion 32 is set to a hemispherical structure. In other embodiments of the present application, the specific shape of the curved surface structure at the top of the sealing portion 32 is not limited, and can be set to a conical structure, a cylindrical structure or other special-shaped structures.

[0038] The connecting portion 33 includes a liquid collecting plate 331, which is arranged in the connecting portion 33 and covers the liquid inlet. The liquid collecting plate 331 has an opening 332, which is connected to the liquid inlet, and the aperture of the opening 332 is smaller than the aperture of the liquid inlet. Through the above arrangement, the connecting portion 33 is connected to the sealing portion 32, and the liquid collecting plate 331 can collect the condensed showerhead on the side wall of the sealing portion 32, so that the evaporated water vapor or showerhead can be collected more effectively.

[0039] At the same time, the aperture of the opening 332 is smaller than the aperture of the liquid inlet, so that the opening 332 can reduce the passing rate of the evaporated water vapor or the leachate from the cavity 21 through the liquid inlet, and most of the water vapor or leachate evaporated from the soil can first condense on the side of the liquid collecting plate 331 close to the cavity 21, and can directly return to the soil after condensation, and a small part of the evaporated water vapor or leachate enters the liquid collecting cavity 31 through the opening 332 for collection. On the other hand, the above structure can also facilitate the overlap of the liquid collecting plate 331 and the liquid inlet of the column 20, which is convenient for the assembly of the liquid collecting plate 331 and the column 20.

[0040] Specifically, a liquid absorbing material is also provided in the liquid collecting cavity 31, and the liquid absorbing material is placed on the liquid collecting plate 331, and the liquid absorbing material covers the opening 332. Through the above structure, the liquid absorbing material can intercept the water vapor or the leaching solution evaporated in the cavity 21, so that most of the evaporated leaching solution or water vapor can be intercepted inside the cavity 21 and return to the soil, thereby reducing the error in the subsequent calculation of the volume of the leaching solution.

[0041] Furthermore, the absorbent material can also absorb the water vapor or shower solution passing through the opening 332. In this way, the volume of the absorbent material is weighed before the test, and the volume difference before and after the test is weighed again to calculate the volume difference before and after the test, so as to obtain the volume of the water vapor or shower solution adsorbed by the absorbent material, and then subtract this part of the volume to improve the accuracy of the experimental results.

[0042] In the present application, the specific material of the liquid absorbing material is not limited, as long as it can absorb evaporated water vapor or leachate, and filter materials such as filter membranes and filter papers can be used.

[0043] In this embodiment, the liquid absorbing material can be set as filter paper, which saves costs and is easy to replace. The size of the filter paper needs to be at least able to completely cover the opening 332. If the size is too small, the opening 332 cannot be blocked, and if the size is too large, it will cause a waste of cost. In this application, the specific size of the filter paper is not limited, and it can be selected according to the openings 332 of different sizes or different types of devices.

[0044] Specifically, 2-3 layers of filter paper are usually placed on the liquid collecting plate 331, and the connection between the filter paper and the liquid collecting plate is soaked with water to ensure that the filter paper can be completely adsorbed and attached to the liquid collecting plate 331, completely covering the opening 332 to ensure the interception effect of the water vapor or liquid evaporated from the cavity 21.

[0045] The sealing part 32 and the connecting part 33 are detachably connected via a connecting structure. The above arrangement facilitates installation and removal of the sealing part 32 and the connecting part 33.

[0046] In the present application, the specific form of the connection structure is not limited. The sealing part 32 and the connecting part 33 can be connected by a clamp connection, a flange connection or an interference fit.

[0047] like Figure 2 As shown, the side wall of the sealing part 32 has a first thread structure 321, and the side wall of the connecting part 33 has a second thread structure 333. The first thread structure 321 cooperates with the second thread structure 333 to form a connecting structure. Through the above arrangement, the sealing part 32 and the connecting part 33 are connected by the thread structure, the structure is simple, the production and processing are convenient, and the production cost of the device is saved. At the same time, there is no need to set up an additional fixing mechanism, which is convenient for the replacement and disassembly of the connecting part 33 and the sealing part 32.

[0048] In this embodiment, there is no limitation on the internal and external threads of the first thread structure 321 and the second thread structure 333, and the first thread structure and the second thread structure can cooperate with each other. The first thread structure 321 can be an external thread and the second thread structure 333 can be an internal thread; or the first thread structure 321 can be an internal thread and the second thread structure 333 can be an external thread.

[0049] In another embodiment of the present application, a first protrusion may be provided on the side wall of the sealing portion 32, and a corresponding groove may be provided on the connecting portion 33; or a second protrusion may be provided on the connecting portion 33, and a second groove may be provided on the sealing portion 32. The sealing portion 32 and the connecting portion 33 are connected by snap-fit, and a fastening structure such as a flange is provided on the periphery of the connection to ensure the reliability of the connection between the sealing portion 32 and the connecting portion 33.

[0050] like Figure 1 and Figure 4 As shown, the leaching device also has a liquid outlet pipe 40, which is connected to the liquid outlet 23, and a switch valve 41 is provided on the liquid outlet pipe 40. The liquid outlet pipe 40 is threadedly connected to the liquid outlet 23. Through the above arrangement, the opening and closing of the liquid outlet pipe 40 can be controlled by the switch valve 41, so as to facilitate the collection of the leaching solution. The substances soluble in the leaching solution in the soil in the column 20 are discharged from the liquid outlet 23 to the collection device through the liquid outlet pipe 40, and the chemical composition of the outflowing leaching solution is detected and analyzed.

[0051] like Figure 1 and Figure 3 As shown, a third thread structure 334 is provided on the side wall of the connecting portion 33 close to one end of the column 20, and a fourth thread structure is provided on the side wall of the column 20, and the third thread structure 334 is connected with the fourth thread structure. Through the above arrangement, the connecting portion 33 and the column 20 are connected through the thread structure, which facilitates the assembly and disassembly of the connecting portion 33 and the column 20.

[0052] In other embodiments of the present application, the side wall of one end of the connecting portion 33 close to the column 20 can also be connected to the side wall of the column 20 by means of interference fit, a snap-fit ​​structure, etc., and a fixed sealing structure can be provided on the periphery of the connection.

[0053] In the present application, the base 10 includes a mounting plate 11 and a plurality of supporting legs 12, the column 20 is arranged on the mounting plate 11, the plurality of supporting legs 12 are used to support the mounting plate 11, and the liquid outlet 23 is spaced apart from the bottom of the supporting legs 12, so that it is convenient to place a collecting device to collect the eluent discharged from the liquid outlet pipe 40. Through the above arrangement, the reliability of the base supporting the column 20 can be ensured.

[0054] Furthermore, the column 20 is made of a transparent material. Through the above arrangement, it is convenient to observe the state of the soil inside the column 20 at any time, and a scale 24 is also provided on the column 20, so that the volume of the soil added in the experiment can be accurately calculated, and during the experiment, the volume change of the soil can be observed at any time, which is convenient for recording the data in different steps.

[0055] Specifically, a handle 34 is further provided on the top of the cover 30, which is convenient for moving, installing and replacing the cover 30. In this embodiment, the shape of the handle 34 is not limited, and can be set to be round, square or C-shaped.

[0056] In one embodiment of the present application, a foot pad can be further provided at the bottom of the supporting leg 12, so as to increase the friction between the supporting leg 12 and the placement plane, thereby ensuring the stability and reliability of the placement of the leaching device, and at the same time ensuring the horizontality of the soil placement, so as to ensure that the volume of the soil corresponds to the scale accurately, thereby avoiding errors in the volume reading due to the tilt of the device.

[0057] Specifically, a layer of quartz sand is placed at the upper and lower ends of the soil respectively. Placing quartz sand in the upper layer of the soil can avoid impact damage to the soil when the leaching solution is added to the column 20. Adding quartz sand in the lower layer of the soil can prevent the leaching solution from flushing the soil out of the cavity 21 and into the liquid outlet pipe 40 during the leaching process, thereby causing a large error in the test results.

[0058] Specifically, before using the leaching device provided by the present application for testing, the operating steps are as follows: first remove the sealing part 32 and the connecting part 33, add the soil sample to be tested into the column 20 from the liquid inlet, then connect the connecting part 33 to the column 20, and inject a quantitative volume of leaching solution into the cavity 21 from the opening 332, then place 2-3 pieces of filter paper on the liquid collecting plate 331, cover the opening 332, moisten the surrounding with water, ensure that the filter paper is tightly attached to the liquid collecting plate 331, and then cover the sealing part 32, and then the test can be carried out. During the experiment, if necessary, the filter paper can be uncovered at any time to add water into the column 20 through the opening 332.

[0059] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0060] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0061] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0062] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0063] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0064] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A leaching device, characterized in that: The leaching device comprises: Base (10); A column (20) is arranged on the base (10), the column (20) has a cavity (21), the column (20) has a liquid inlet and a liquid outlet (23) arranged opposite to each other, the liquid inlet and the liquid outlet (23) are connected to the cavity (21), the liquid inlet is arranged at the top of the column (20), the liquid outlet (23) is arranged at the bottom of the column (20), and the cavity (21) is used to fill soil; A cover body (30) is arranged on the top of the column (20), the cover body (30) closes the liquid inlet, the cover body (30) has a liquid collecting chamber (31), the liquid collecting chamber (31) is connected to the cavity (21) through the liquid inlet, and the top of the cover body (30) is a curved surface structure, and the curved surface structure is used to collect water vapor evaporated in the cavity (21).

2. The leaching device according to claim 1, characterized in that: The cover body (30) comprises a sealing portion (32) and a connecting portion (33) which are connected to each other, the connecting portion (33) being connected to the column (20), the sealing portion (32) and the connecting portion (33) cooperating to form the liquid collecting chamber (31), the sealing portion (32) being located on a side of the connecting portion (33) away from the column (20), the top of the sealing portion (32) closing the liquid inlet, and the cross-section of the top of the sealing portion (32) in the horizontal direction gradually increasing towards the direction approaching the liquid inlet.

3. The leaching device according to claim 2, characterized in that: The connecting portion (33) comprises a liquid collecting plate (331), the liquid collecting plate (331) is arranged in the connecting portion (33) and covers the liquid inlet, the liquid collecting plate (331) has an opening (332), the opening (332) is connected to the liquid inlet, and the aperture of the opening (332) is smaller than the aperture of the liquid inlet.

4. The leaching device according to claim 3, characterized in that: A liquid absorbing material is also provided in the liquid collecting chamber (31), the liquid absorbing material is placed on the liquid collecting plate (331), and the liquid absorbing material covers the opening (332).

5. The leaching device according to claim 4, characterized in that: The sealing portion (32) and the connecting portion (33) are detachably connected via a connecting structure.

6. The leaching device according to claim 5, characterized in that: The side wall of the sealing portion (32) has a first thread structure (321), and the side wall of the connecting portion (33) has a second thread structure (333), and the first thread structure (321) cooperates with the second thread structure (333) to form the connecting structure.

7. The leaching device according to claim 1, characterized in that: The leaching device also has a liquid outlet pipe (40), the liquid outlet pipe (40) is in communication with the liquid outlet (23), and a switch valve (41) is provided on the liquid outlet pipe (40).

8. The leaching device according to claim 2, characterized in that: A third thread structure (334) is provided on the side wall of the connecting portion (33) at one end close to the column (20), and a fourth thread structure is provided on the side wall of the column (20), and the third thread structure (334) is connected in cooperation with the fourth thread structure.

9. The leaching device according to claim 1, characterized in that: The base (10) comprises a mounting plate (11) and a plurality of supporting legs (12); the column (20) is inserted into the mounting plate (11); the plurality of supporting legs (12) are used to support the mounting plate (11); and the liquid outlet (23) is spaced apart from the bottom of the supporting legs (12).

10. The leaching device according to claim 1, characterized in that: The column (20) is made of transparent material.

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