Rice soil in-situ liquid extractor

Abstract

The invention relates to a rice soil in-situ liquid extractor, and belongs to the technical field of agricultural liquid sampling, the rice soil in-situ liquid extractor comprises a barrel body and a filter assembly arranged on the barrel body, a plurality of through holes are formed in the side, close to the bottom, of the barrel body in a surrounding mode at equal intervals in the center line direction, and the filter assembly comprises a filter pipe coaxially arranged on the barrel body in a sleeving mode; the through holes in the barrel body are used in cooperation with the filtering pipe and the shielding pipes of the filtering assembly, the shielding pipes are used for wrapping the filtering pipe, the shielding pipes are moved in the detection process, the shielding pipes are moved in the detection process, and therefore the detection efficiency is improved, and the detection efficiency is improved. By means of the structure, the filter pipe is partially exposed, so that liquid in rice soil is separated from the soil through the exposed part of the filter pipe, the separated liquid penetrates through the through hole to enter the barrel body to achieve extraction, the shielding pipe is gradually moved to achieve section-by-section utilization of the filter pipe, the separation effect of soil particles and the liquid is guaranteed, and the liquid extraction effect is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of agricultural liquid sampling, and particularly relates to a rice soil in-situ liquid extractor. Background Art

[0002] Paddy soil refers to the cultivated soil developed on various natural soils, artificially hydrothermally matured, and flooded for rice cultivation, generally used for growing rice. Paddy soil usually needs to maintain a relatively high water content, and the presence of a water layer is an important condition for rice growth. Therefore, most nutrients are dissolved in the liquid of paddy soil. Paddy soil is an important foundation for agricultural production. Understanding the characteristics of paddy soil is of great significance for improving rice production efficiency. When studying the characteristics of paddy soil, it is necessary not only to collect paddy soil but also to extract the liquid in the paddy soil to accurately detect the nutrient and dissolved substance content in the soil. By understanding the concentration of available nutrients in the soil, it can help formulate a more precise fertilization plan, improve crop growth and yield, and avoid over-fertilization and resource waste. When extracting the liquid in paddy soil, generally, the paddy soil together with the liquid is directly sampled, and then the liquid in the sample is squeezed and filtered in the laboratory. However, the liquid extracted by this method is prone to contamination during the sample processing, which in turn affects the accuracy of the detection results.

[0003] Currently, in order to ensure the accuracy of paddy soil detection, the prior art mostly adopts in-situ liquid extraction in the soil. Without excavating or moving the soil, the liquid in the soil is extracted, which can reduce the probability of the obtained liquid being contaminated. When performing in-situ liquid extraction of soil, the sampler is inserted into the pre-selected sampling point in the paddy field. Using the filter screen fixed at the mouth of the sampler, the soil and liquid in the paddy soil are separated. The liquid passes through the filter screen and enters the sampler, and then the liquid in the paddy soil is obtained. Then, go to the next sampling point for liquid extraction. However, due to the relatively fine soil particles in paddy soil, after separating the soil using the filter screen for liquid extraction, soil particles will adhere to the filter screen. After inserting the sampler into the soil at the next sampling point, the soil further squeezes the soil particles adhering to the filter screen, resulting in the soil particles being prone to clogging the filter screen. Therefore, after completing the liquid extraction at the previous sampling point, it is necessary to rinse the filter screen to remove the soil particles adhering to the filter screen so that the liquid can normally pass through the filter screen for extraction at the next sampling point. However, after rinsing the filter screen multiple times, the holes of the filter screen will be deformed, causing the aperture of some holes to increase, resulting in soil particles being prone to enter the sampler, reducing the effect of in-situ liquid extraction of paddy soil. Summary of the Invention

[0004] In view of this, the present invention provides an in-situ liquid extractor for paddy soil to solve the deficiencies in the prior art. The present invention can avoid soil clogging the filter screen and flushing the filter screen, resulting in an increase in the pore diameter of the filter holes, and ensure the separation effect of soil particles and liquid.

[0005] The technical solution of the present invention is: an in-situ liquid extractor for paddy soil, including a barrel body and a filter assembly provided on the barrel body. A plurality of through holes are evenly arranged around the center line direction on one side near the bottom of the barrel body. The filter assembly includes a filter pipe coaxially sleeved on the barrel body, and the filter pipe is fixedly connected to the barrel body. The through holes are located inside the filter pipe, so that the water in the paddy soil is separated from the soil. The separated water passes through the through holes and enters the barrel body. A plurality of shielding pipes are sequentially sleeved on the filter pipe along the center line direction of the barrel body. The ends of adjacent shielding pipes are in contact with each other. The total length of the plurality of shielding pipes is greater than the length of the filter pipe. The shielding pipe is slidably connected to the filter pipe along the center line direction of the barrel body. The shielding pipes are moved one by one to separate the water and soil in the paddy soil in sections along the length direction of the filter pipe.

[0006] Preferably, two annular members are sleeved on the barrel body. The annular members are connected to the barrel body. The shielding pipe is located between the two annular members. Both ends of the filter pipe are connected to the annular members. A plurality of guide rods are arranged around the outside of the filter pipe. The guide rods are parallel to the center line of the annular members. Both ends of the guide rods are connected to the annular members. The guide rods sequentially pass through the shielding pipe and are slidably connected to it respectively.

[0007] Preferably, a plurality of guide holes are opened in the radial direction of the outside of the shielding pipe. The guide holes are located outside the guide rods. Slide rods are respectively inserted into the guide holes. One end of the slide rod abuts against the guide rod.

[0008] Preferably, a plurality of sinking grooves are opened in the radial direction of the inside of the shielding pipe. The sinking grooves are located inside the guide rods. The sinking grooves communicate with the guide holes. A limiting sleeve is arranged in the sinking groove and is slidably connected to it. The guide rod passes through the limiting sleeve. The slide rod extends into the sinking groove and is fixedly connected to the limiting sleeve. An elastic member is sleeved on the slide rod, so that the inside of the end of the limiting sleeve away from the elastic member abuts against the guide rod.

[0009] Preferably, annular sinking grooves are coaxially opened on the side where the two annular members are close to each other. Both ends of the filter pipe extend into the annular sinking grooves and abut against them.

[0010] Preferably, an external thread is provided on one side of the barrel body near its mouth. The annular member close to the mouth of the barrel body is in threaded fit connection with the barrel body. The other annular member is fixedly connected to the barrel body. One end of the guide rod abuts against the annular member on the side close to the mouth of the barrel body, and the other end is fixedly connected to the annular member on the side close to the bottom of the barrel body.

[0011] Preferably, a collecting hopper is provided in the barrel body. The collecting hopper is slidably connected to the barrel body along the central line direction of the barrel body. A conduit is provided on the collecting hopper. One end of the conduit communicates with the inside of the collecting hopper, and the other end is communicated with an external suction device through a pipeline.

[0012] Preferably, a support plate is provided directly above the collecting hopper. The support plate is connected to the inner bottom of the collecting hopper through a support rod. One end of the conduit passes through the support plate and extends into the collecting hopper, and the conduit is fixedly connected to the support plate.

[0013] Preferably, a barrel cover is provided at the mouth of the barrel body and is detachably and fixedly connected thereto. The end of the conduit away from the collecting hopper passes through the barrel cover and is slidably connected thereto. A threaded fastener is provided on the barrel cover, and the threaded fastener abuts against the conduit.

[0014] Compared with the prior art, a rice soil in-situ liquid extractor provided by the present invention uses the through holes on the barrel body in cooperation with the filter pipe and the shielding pipe of the filter assembly. The shielding pipe is used to wrap the filter pipe. When extracting the rice soil in-situ liquid, by moving the shielding pipe, a part of the filter pipe is exposed. The barrel body is inserted into the rice soil, so that the liquid in the soil is separated from the soil through the exposed part of the filter pipe. The separated liquid passes through the through hole and enters the barrel body to achieve extraction. By gradually moving the shielding pipe, the filter pipe is utilized section by section, avoiding the situation of soil clogging the filter screen and flushing the filter screen to cause the pore diameter of the filter holes to increase, ensuring the separation effect of soil particles and liquid, and thus improving the extraction effect of the rice soil in-situ liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the front view of the extractor of the present invention;

[0016] Figure 2 is the side view of the extractor of the present invention;

[0017] Figure 3 is the present invention Figure 1 A-A sectional view;

[0018] Figure 4 is the present invention Figure 2 B-B sectional view;

[0019] Figure 5 is the present invention Figure 3 Enlarged schematic view at C;

[0020] Figure 6 is the structural schematic diagram of the collecting hopper of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The present invention provides a rice soil in-situ liquid extractor. The following combines Figures 1 to 6 the structural schematic diagram to describe the present invention.

[0022] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the technical solution of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0023] Paddy soil refers to the cultivated soil developed on various natural soils, artificially hydrothermally matured, and flooded for rice cultivation, and is generally used for growing rice. Paddy soil usually needs to maintain a relatively high water content. The presence of a water layer is an important condition for rice growth, so most nutrients are dissolved in the liquid of paddy soil. Paddy soil is an important foundation for agricultural production. Understanding the characteristics of paddy soil is of great significance for improving rice production efficiency.

[0024] When studying the characteristics of paddy soil, it is not only necessary to collect paddy soil, but also to extract the liquid in the paddy soil, so as to accurately detect the nutrients and dissolved substance content in the soil. By understanding the concentration of available nutrients in the soil, it can help formulate a more precise fertilization plan, improve crop growth and yield, and avoid over-fertilization and resource waste. When extracting the liquid in paddy soil, generally, the paddy soil together with the liquid is directly sampled, and then the liquid in the sample is squeezed and filtered out in the laboratory. However, the liquid extracted by this method is prone to contamination during the sample treatment process, which in turn affects the accuracy of the detection results.

[0025] At present, in order to ensure the accuracy of paddy soil detection, the prior art mostly adopts in-situ liquid extraction in the soil. Without excavating or moving the soil, the liquid in the soil is extracted, which can reduce the probability of the obtained liquid being contaminated. When performing in-situ liquid extraction of the soil, the sampler is inserted into the pre-selected sampling point in the paddy field. By using the filter screen fixed at the mouth of the sampler, the soil and liquid in the paddy soil are separated. The liquid passes through the filter screen and enters the sampler, and then the liquid in the paddy soil is obtained. Then, go to the next sampling point for liquid extraction. However, due to the fine soil particles in the paddy soil, after separating the soil by using the filter screen for liquid extraction, soil particles will adhere to the filter screen. After inserting the sampler into the soil at the next sampling point, the soil further squeezes the soil particles adhering to the filter screen, resulting in the easy blockage of the filter screen by the soil particles. Therefore, after completing the liquid extraction at the previous sampling point, it is necessary to rinse the filter screen to remove the soil particles adhering to the filter screen, so that the liquid can normally pass through the filter screen for extraction at the next sampling point. However, after rinsing the filter screen multiple times, the holes of the filter screen will be deformed, causing the aperture of some holes to increase, resulting in the easy entry of soil particles into the sampler and reducing the effect of in-situ liquid extraction of paddy soil.

[0026] Based on the above problems, a paddy soil in-situ liquid extractor provided by an embodiment of the present invention uses the through hole on the barrel body in cooperation with the filter pipe and the shielding pipe of the filter assembly. The filter pipe is wrapped by the shielding pipe. When performing in-situ liquid extraction of paddy soil, by moving the shielding pipe, a part of the filter pipe is exposed. The barrel body is inserted into the paddy soil, so that the liquid in the soil is separated from the soil by using the exposed part of the filter pipe. The separated liquid passes through the through hole and enters the barrel body to achieve extraction. By gradually moving the shielding pipe, the filter pipe is utilized section by section, avoiding the situation of soil clogging the filter screen and the increase of the filter hole aperture caused by rinsing the filter screen, ensuring the separation effect of soil particles and liquid, and thus improving the extraction effect of in-situ liquid of paddy soil. The filter pipe of the present invention is convenient to use, has a good extraction effect, and strong practicability, and is worthy of promotion.

[0027] Refer to Figure 1 and Figure 3 , Figure 1 is the front view of the extractor of this embodiment, Figure 3 is the A-A sectional view of the extractor of this embodiment, as Figure 1 、 3As shown in the figure, a rice soil in-situ liquid extractor includes a barrel body 1 and a filtering component arranged on the barrel body 1. A plurality of through holes 11 are evenly arranged in a circumferential manner along the center line direction on one side of the barrel body 1 close to its bottom. The filtering component includes a filtering pipe 3 coaxially sleeved on the barrel body 1, and the filtering pipe 3 is fixedly connected to the barrel body 1. The through holes 11 are located inside the filtering pipe 3, so that the water in the rice soil is separated from the soil. The separated water passes through the through holes 11 and enters the barrel body 1. A plurality of shielding pipes 4 are sequentially sleeved on the filtering pipe 3 along the center line direction of the barrel body 1. The ends of adjacent shielding pipes 4 are in mutual abutment. The total length of the plurality of shielding pipes 4 is greater than the length of the filtering pipe 3. The shielding pipes 4 are slidably connected to the filtering pipe 3 along the center line direction of the barrel body 1. The shielding pipes 4 are moved one by one to enable the filtering pipe 3 to separate the water and soil in the rice soil section by section along its length direction.

[0028] In the rice soil in-situ liquid extractor of this embodiment, liquid extraction can be carried out at multiple pre-selected sampling points in the paddy field in sequence. When carrying out liquid extraction, the shielding pipe 4 at the lowermost side of the barrel body 1 is slid downward, so that a part of the filtering pipe 3 inside the shielding pipe 4 is exposed. Then the barrel body 1 is slowly inserted vertically into the rice soil. The exposed part of the filtering pipe 3 is used to separate the soil and the liquid. The liquid passes through the filtering pipe 3 and enters the barrel body 1 along the through holes 11 to realize liquid extraction. After the liquid extraction is completed, the barrel body 1 is slowly taken out of the soil. After moving to the next sampling point, the shielding pipe 4 above the part of the filtering pipe 3 adhered with soil particles is moved downward to wrap the part of the filtering pipe 3 adhered with soil particles, so that a part is re-exposed on the filtering pipe 3. Then the barrel body 1 is inserted into the sampling point again to take out the liquid. Repeating the above process can carry out in-situ liquid extraction of rice soil at multiple points. At the same time, there is no need to worry about the situation that soil particles block the filter holes and the need to wash the filter screen resulting in an increase in the pore diameter, ensuring the separation effect of soil particles and liquid, thereby improving the extraction effect of rice soil in-situ liquid.

[0029] Refer to Figure 2 , Figure 2 is the side view of the extractor of this embodiment. As Figure 2 shown, as a further optimization scheme, two annular members 5 are sleeved on the barrel body 1 in this embodiment. The annular members 5 are connected to the barrel body 1. The shielding pipes 4 are located between the two annular members 5. Both ends of the filtering pipe 3 are connected to the annular members 5. A plurality of guide rods 6 are arranged around the outer side of the filtering pipe 3. The guide rods 6 are parallel to the center line of the annular members 5. Both ends of the guide rods 6 are connected to the annular members 5. The guide rods 6 sequentially pass through the shielding pipes 4 and are respectively slidably connected thereto.

[0030] In this embodiment, while the filter tube 3 is fixed by the annular member 5, it can cooperate with the guide rod 6 to guide the shielding tube 4, so that the downward moving shielding tube 4 can always shield the part of the filter tube 3 adhered with soil particles, avoiding the soil particles adhered to the filter tube 3 from being squeezed through the filter tube 3 or causing the filter holes to increase, further preventing soil particles from entering the barrel 1, and further improving the extraction effect of in-situ liquid of rice soil.

[0031] As a further optimization scheme, in this embodiment, a plurality of guide holes are radially formed on the outer side of the shielding tube 4, the guide holes are located outside the guide rod 6, and sliding rods 41 are respectively inserted into the guide holes, and one end of each sliding rod 41 abuts against the guide rod 6.

[0032] In this embodiment, by using the cooperation of the guide holes provided on the shielding tube 4 and the sliding rods 41, the friction force between the sliding rods 41 and the guide rod 6 can be utilized to keep the position of the shielding tube 4 stable, avoiding the free sliding of the shielding tube 4 above the exposed area of the filter tube 3, so that the exposed area of the filter tube 3 remains stable after the shielding tube 4 moves, and improving the extraction stability of in-situ liquid of rice soil.

[0033] Refer to Figure 4 and Figure 5 , Figure 4 is the B-B cross-sectional view of the extractor in this embodiment, Figure 5 is the enlarged schematic view at C of the extractor in this embodiment. As shown in Figure 4 , 5 shown, as a further optimization scheme, in this embodiment, a plurality of sinking grooves 42 are radially formed on the inner side of the shielding tube 4, the sinking grooves 42 are located inside the guide rod 6, the sinking grooves 42 are communicated with the guide holes, a limiting sleeve 43 is arranged in the sinking grooves 42 and is slidably connected therewith, the guide rod 6 passes through the limiting sleeve 43, the sliding rod 41 extends into the sinking grooves 42 and is fixedly connected with the limiting sleeve 43, and an elastic member 44 is sleeved on the sliding rod 41 so that the inner side of one end of the limiting sleeve 43 away from the elastic member 44 abuts against the guide rod 6.

[0034] In this embodiment, by using the cooperation of the limiting sleeve 43, the elastic member 44 and the sliding rod 41 in the sinking grooves 42, the elastic member 44 drives the limiting sleeve 43 to provide stable friction force with the guide rod 6 under normal state, further improving the stability of the shielding tube 4.

[0035] As a further optimization scheme, in this embodiment, annular sinking grooves are coaxially formed on the mutually approaching sides of the two annular members 5, and both ends of the filter tube 3 extend into the annular sinking grooves and abut against them.

[0036] In this embodiment, the annular groove provided on the annular member 5 can position the filter tube 3, prevent the filter tube 3 from sliding and displacing, further improve the stability of the filter tube 3 in separating soil and liquid in paddy soil, and ensure the separation effect of soil particles and liquid.

[0037] As a further optimized solution, in this embodiment, the barrel 1 is provided with an external thread on one side near its mouth, the annular member 5 near the mouth of the barrel 1 is in threaded connection with the barrel 1, another annular member 5 is fixedly connected to the barrel 1, one end of the guide rod 6 abuts against the annular member 5 on the side near the mouth of the barrel 1, and the other end is fixedly connected to the annular member 5 on the side near the bottom of the barrel 1.

[0038] In this implementation, due to the external thread provided on the barrel 1, the annular member 5 near the mouth of the barrel 1 is in threaded connection with the barrel 1. After each section of the filter tube 3 is used up, the annular member 5 near the mouth of the barrel 1 is removed from the barrel 1, the used filter tube 3 is taken off and replaced with a new one (or according to the situation of soil particles adhering to the used filter tube 3, it can be rinsed and reused one to two times). The new filter tube 3 or the filter tube 3 that can be evaluated as reusable after rinsing is sleeved on the barrel 1, and then the removed annular member 5 is reinstalled before the sampling operation can continue.

[0039] As a further optimized solution, in this embodiment, a collecting hopper 7 is provided in the barrel 1. The collecting hopper 7 is slidably connected to the barrel 1 along the central axis direction of the barrel 1. A conduit 8 is provided on the collecting hopper 7. One end of the conduit 8 is communicated with the inside of the collecting hopper 7, and the other end is communicated with an external suction device through a pipeline.

[0040] In this embodiment, through the collecting hopper 7 in the barrel 1, the liquid entering the barrel 1 along the through hole 11 can be collected, and then the collected liquid is pumped out by using the conduit, pipeline and external suction device. At the same time, when using each section of the filter tube 3, the collecting hopper 7 can be driven to move upward along the central axis direction of the barrel 1 through the conduit 8, so that the edge of the mouth of the collecting hopper 7 is flush with the lower edge of the partially exposed area of the filter tube, enabling the liquid separated by this part of the filter tube 3 to directly flow into the collecting hopper 7 and improving the collection speed of the extracted liquid.

[0041] In this embodiment, a sliding groove is opened on the inner wall of the barrel 1 along its central axis direction. A limiting block is fixedly provided on the outside of the collecting hopper 7, and the limiting block is embedded in the sliding groove and is slidably connected thereto.

[0042] Refer to Figure 6 , Figure 6 is the structural schematic diagram of the collecting hopper in this embodiment. As shown in Figure 6As shown in the figure, as a further optimization solution, in this embodiment, a support plate 9 is provided directly above the collection hopper 7. The support plate 9 is connected to the inner bottom of the collection hopper 7 through a support rod 10. One end of the conduit 8 passes through the support plate 9 and extends into the collection hopper 7, and the conduit 8 is fixedly connected to the support plate 9.

[0043] In this embodiment, the support plate 9 and the support rod 10 are used to fixedly connect the conduit 8 to the collection hopper 7. While ensuring that the conduit 8 sucks out the liquid in the collection hopper 7, the conduit 8 can drive the collection hopper 7 to move.

[0044] As a further optimization solution, in this embodiment, a bucket cover 13 is provided at the mouth of the bucket body 1 and is detachably and fixedly connected thereto. One end of the conduit 8 away from the collection hopper 7 passes through the bucket cover 13 and is slidably connected thereto. A threaded fastener is provided on the bucket cover 13, and the threaded fastener abuts against the conduit 8.

[0045] In this embodiment, the bucket cover 13 is used to prevent foreign objects from falling into the bucket body 1 and the collection hopper 7, and can also position the conduit 8, so that the collection hopper 7 can be fixed at any position.

[0046] In addition, an annular floating plate 12 is coaxially sleeved on the upper part of the bucket body 1, and the annular floating plate 12 is detachably and fixedly connected to the bucket body 1, so that the bucket body 1 remains at this depth for liquid extraction after being inserted into the soil.

[0047] The above-disclosed are only the preferred specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto, and any changes that can be thought of by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A rice soil in-situ liquid extractor, characterized in that: include: A barrel body (1) and a filter assembly arranged on the barrel body (1), wherein a plurality of through holes (11) are formed around the barrel body (1) at equal intervals along the center line direction near the bottom of the barrel body (1), and the filter assembly comprises: A filter tube (3) is coaxially sleeved on the barrel body (1), the filter tube (3) is fixedly connected to the barrel body (1), and the through hole (11) is located on the inner side of the filter tube (3) so as to separate the liquid in the paddy soil from the soil, and the separated liquid passes through the through hole (11) and enters the barrel body (1); A plurality of shielding tubes (4) are sequentially sleeved on the filter tube (3) along the center line direction of the barrel body (1), the ends of adjacent shielding tubes (4) abut against each other, the total length of the plurality of shielding tubes (4) is greater than the length of the filter tube (3), the inner sides of the shielding tubes (4) abut against the filter tube (3), and the shielding tubes (4) are moved one by one along the center line direction of the barrel body (1), so that the filter tube (3) separates the liquid and soil in the paddy soil section by section along its length direction.

2. The paddy soil in-situ liquid extractor according to claim 1, characterized in that: Two annular members (5) are mounted on the barrel body (1), the annular members (5) are connected to the barrel body (1), the shielding tube (4) is located between the two annular members (5), the two ends of the filter tube (3) are connected to the annular members (5), a plurality of guide rods (6) are arranged around the outer side of the filter tube (3), the center lines of the guide rods (6) and the annular members (5) are parallel to each other, the two ends of the guide rods (6) are connected to the annular members (5), and the guide rods (6) pass through the shielding tubes (4) in sequence and are respectively slidably connected thereto.

3. The paddy soil in-situ liquid extractor according to claim 2, characterized in that: The outer side of the shielding tube (4) is provided with a plurality of guide holes along its radial direction, the guide holes being located on the outer side of the guide rod (6), and slide rods (41) are respectively passed through the guide holes, and one end of the slide rod (41) is in contact with the guide rod (6).

4. The paddy soil in-situ liquid extractor according to claim 3, characterized in that: The inner side of the shielding tube (4) is provided with a plurality of recessed grooves (42) along its radial direction. The recessed grooves (42) are located on the inner side of the guide rod (6). The recessed grooves (42) are communicated with the guide hole. A limiting sleeve (43) is provided in the recessed groove (42) and is slidably connected with the limiting sleeve (43). The guide rod (6) passes through the limiting sleeve (43). The sliding rod (41) extends into the recessed groove (42) and is fixedly connected with the limiting sleeve (43). An elastic member (44) is sleeved on the sliding rod (41) so that the inner side of one end of the limiting sleeve (43) away from the elastic member (44) abuts against the guide rod (6).

5. The rice soil in-situ liquid extractor according to claim 2, characterized in that: An annular groove is coaxially formed on one side of the two annular members (5) close to each other, and both ends of the filter tube (3) extend into the annular groove and abut against it.

6. The paddy soil in-situ liquid extractor according to claim 2, characterized in that: The barrel body (1) is provided with an external thread on one side near the mouth of the barrel body (1); a ring member (5) near the mouth of the barrel body (1) is threadedly connected to the barrel body (1); another ring member (5) is fixedly connected to the barrel body (1); one end of the guide rod (6) abuts against the ring member (5) near the mouth of the barrel body (1); and the other end is fixedly connected to the ring member (5) near the bottom of the barrel body (1).

7. The rice soil in-situ liquid extractor according to claim 1, characterized in that: The barrel body (1) is provided with a collecting bucket (7), the collecting bucket (7) being slidably connected to the barrel body (1) along the center line direction thereof, the collecting bucket (7) being provided with a conduit (8), one end of the conduit (8) being connected to the interior of the collecting bucket (7), and the other end of the conduit being connected to an external suction device via a pipeline.

8. The rice soil in-situ liquid extractor according to claim 7, characterized in that: A support plate (9) is provided directly above the collecting bucket (7); the support plate (9) is connected to the inner bottom of the collecting bucket (7) via a support rod (10); one end of the conduit (8) passes through the support plate (9) and extends into the collecting bucket (7); the conduit (8) is fixedly connected to the support plate (9).

9. The rice soil in-situ liquid extractor according to claim 7, characterized in that: The mouth of the barrel body (1) is provided with a barrel cover (13) which is detachably fixedly connected thereto; one end of the conduit (8) away from the collecting hopper (7) passes through the barrel cover (13) and is slidably connected thereto; a threaded fastener is provided on the barrel cover (13) and the threaded fastener abuts against the conduit (8).

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