An in-situ sampling device for organic matter in groundwater

Abstract

This application belongs to the technical field of sampling devices and discloses an in-situ sampling device for groundwater organic matter. It includes a mounting frame and four sets of rotatable wheels mounted on the mounting frame. A limiting tube is fixed to the bottom of the upper frame of the mounting frame. A mounting sleeve that mates with the limiting tube is movably sleeved on the limiting tube. A drill bit is provided at the bottom of the mounting sleeve, fitting snugly against the bottom of the mounting sleeve. A sampling chamber is provided inside the mounting sleeve. Multiple water inlet holes are provided through the bottom of the sampling chamber at positions corresponding to the drill bit. A drive mechanism is provided on the mounting frame to drive the mounting sleeve to rise, fall, and rotate. A sampling mechanism is jointly provided on the mounting frame and the mounting sleeve to drive the drill bit to rise and fall, and to inject water into the sampling chamber when the drill bit rises. This application, by setting up the mounting sleeve, drill bit, sampling chamber, drive mechanism, and sampling mechanism, reduces the probability of soil entering the water inlet holes and compacting, while ensuring normal sampling operation of the device.

Description

Technical Field

[0001] This utility model relates to the field of sampling device technology, and in particular to an in-situ sampling device for organic matter in groundwater. Background Technology

[0002] Groundwater organic matter in-situ sampling device is a device used to directly collect water samples containing organic matter from the groundwater environment, such as a groundwater sampler. A groundwater sampler is a device specifically designed for collecting groundwater samples and is widely used in environmental monitoring, hydrological research, water resource management, and industrial production.

[0003] A groundwater sampler for geological exploration is disclosed in Chinese utility model patent with publication number CN219475088U. It includes a frame, a sampling section, a drilling section, a pressure pump, and a water inlet valve. The sampling section is installed on the lower side of the frame via a lifting assembly. The drilling section is installed at the bottom of the sampling section to drive the sampling section to drill into the underground. The pressure pump is installed on the sampling section to control the air pressure inside the sampling section. The sampling section includes a sampling tube and an installation tube. The sampling tube has a cavity inside, and multiple water inlet holes are opened on the circumferential side wall of the sampling tube to draw groundwater into the sampling section. The outside of the water inlet holes is also equipped with a protective net and a filter cloth.

[0004] During the drilling process of the aforementioned groundwater sampler for geological exploration, the protective netting is exposed to the outside environment. As a result, the protective netting will be squeezed against the broken soil, increasing the probability that the broken soil will enter the mesh of the protective netting and be compacted, thus affecting the normal sampling operation of the device. Utility Model Content

[0005] To address the aforementioned problems, this invention provides an in-situ sampling device for organic matter in groundwater.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: an in-situ sampling device for groundwater organic matter, comprising a mounting frame and four sets of movable wheels rotatably mounted on the mounting frame. A limiting tube is fixed to the bottom of the upper frame of the mounting frame. An installation sleeve that cooperates with the limiting tube is movably sleeved on the limiting tube. A drill bit that fits against the bottom of the installation sleeve is provided at the bottom of the installation sleeve. A sampling chamber is provided inside the installation sleeve. Multiple water inlet holes are provided through the bottom of the sampling chamber at the position corresponding to the drill bit. A driving mechanism for driving the installation sleeve to rise, fall and rotate is provided on the mounting frame. A sampling mechanism for driving the drill bit to rise and fall and injecting water into the sampling chamber when the drill bit rises is provided on both the mounting frame and the installation sleeve.

[0007] By adopting the above technical solution, during the sampling process of the device, the installation sleeve is first driven by the drive mechanism to descend and rotate, so that the drill bit connected to the installation sleeve descends and drills the soil until the installation sleeve descends to the groundwater layer. Finally, the groundwater is sampled by the sampling mechanism. During the drilling process, the drill bit blocks the water inlet hole, thereby reducing the probability of soil entering the water inlet hole and being compacted, and thus ensuring the normal sampling operation of the device.

[0008] Furthermore, the driving mechanism includes an electro-hydraulic push rod fixed to the top of the mounting bracket, a mounting block fixed to the end of the push rod of the electro-hydraulic push rod, and a limiting post rotatably mounted on the inner side wall of the mounting sleeve. The mounting sleeve passes through the mounting block and is rotatably connected to it. A spiral groove is provided on the side wall of the limiting tube to slide with the limiting post.

[0009] By adopting the above technical solution, after the electric hydraulic push rod is working and its push rod end is extended, the mounting block fixed to the push rod end of the electric hydraulic push rod, the mounting sleeve rotatably connected to the mounting block, and the limiting post connected to the mounting sleeve all descend. Since the limiting post is slidably connected to the spiral groove, the mounting sleeve drives the drill bit to rotate and drill holes in the soil to ensure normal sampling work.

[0010] Furthermore, the sampling mechanism includes a sampling assembly, which includes a rectangular rod that is slidably connected to and penetrates the bottom of the sampling chamber. The bottom of the rectangular rod is fixed to the top of the drill bit. The sampling assembly also includes a sealing piston that is slidably connected to the sampling chamber and fixed to the rectangular rod, a reset spring that is fixed between the top of the sampling assembly and the top wall of the sampling chamber, and an air supply pipe that is fixed to and penetrates the bottom of the sampling chamber. The air supply pipe passes through a limiting tube. The sampling mechanism also includes an air supply assembly for supplying air to the air supply pipe.

[0011] By adopting the above technical solution, air is supplied to the air supply pipe through the air supply assembly, increasing the air pressure inside the sampling chamber. This causes the sealing piston, the rectangular rod connected to the sealing piston, and the drill bit connected to the rectangular rod to all descend. The return spring gradually extends until the sealing piston is in contact with the inner bottom wall of the sampling chamber. Subsequently, the air supply assembly extracts the gas from the air supply pipe, gradually reducing the air pressure inside the sampling chamber. The return spring gradually contracts and resets, causing the sealing piston, rectangular rod, and drill bit to rise. External water enters the sampling chamber through the water inlet hole until the drill bit is in contact with the bottom of the mounting sleeve again, thus completing the sampling operation of the device.

[0012] Furthermore, the air supply assembly includes a sealed box disposed on the top of the mounting frame, an air supply piston slidably connected inside the sealed box, and an air supply rack fixed on the air supply piston. The air supply rack passes through the sealed box and is slidably engaged. The air supply assembly also includes an air supply motor fixed on the top of the mounting frame and an air supply gear fixedly sleeved on the output end of the air supply motor and meshing with the air supply rack. The air supply pipe is connected to the sealed box.

[0013] By adopting the above technical solution, after the gas supply motor starts working, it drives the gas supply gear to rotate, causing the gas supply rack meshing with the gas supply gear and the gas supply piston connected to the gas supply rack to move. The gas supply piston compresses the air in the sealed box and increases the pressure inside the sealed box. Since the gas supply pipe is connected to the inside of the sealed box, the purpose of increasing the pressure inside the sampling chamber is achieved. Similarly, after the gas supply motor starts working, it drives the gas supply gear to rotate in the opposite direction, causing the gas supply rack and the gas supply piston to move in the opposite direction, thereby achieving the purpose of reducing the pressure inside the sampling chamber.

[0014] Furthermore, the mounting frame is equipped with a winding mechanism, which includes a winding assembly. The winding assembly includes a fixed frame fixed to the top of the mounting frame and having a U-shaped structure, a winding drum rotatably mounted between the side plates on both sides of the fixed frame, and an air supply pipe fixed to one end of the winding drum near the sealing box and coaxially arranged with the winding drum. The sealing box is fixed to the fixed frame, and the air supply pipe communicates with the inside of the winding drum. The air supply pipe passes through the fixed frame and is rotatably connected. The air supply pipe passes through the sealing box and is rotatably connected. The air supply pipe communicates with the inside of the sealing box. The side wall of the air supply pipe away from the sampling chamber is wound around the winding drum. One end of the air supply pipe near the air supply pipe is fixed and communicates with the side wall of the winding drum. The winding mechanism also includes a rotating assembly for driving the winding drum to rotate.

[0015] By adopting the above technical solution, the air supply pipe can be released by rotating the fixed frame through the rotating component, so that the air supply pipe can descend together with the mounting sleeve. Similarly, the air supply pipe can be retracted by rotating the fixed frame in the opposite direction through the rotating component, so that the air supply pipe can rise together with the mounting sleeve, ensuring the normal use of the device.

[0016] Furthermore, the rotating assembly includes a rotating shaft fixed to one end of the take-up drum away from the sealing box and coaxially arranged with the take-up drum, a rotating gear fixedly sleeved on the rotating shaft, and a rotating rack that passes through the top of the mounting frame and is slidably engaged with the rotating gear. The lower end of the rotating rack is fixed to the top of the mounting block.

[0017] By adopting the above technical solution, during the lifting and lowering process of the mounting block, the rotating rack connected to the mounting block is also lifted and lowered. Since the rotating rack meshes with the rotating gear, and the rotating gear is fixedly sleeved on the rotating shaft, and the rotating shaft is fixed to the fixed frame, the synchronous movement of the mounting sleeve and the drill bit can be achieved.

[0018] Furthermore, the sampling assembly also includes a slide rod fixed between the bottom wall and the top wall of the sampling chamber, the slide rod being disposed through and slidably engaged with the sealing piston, and the reset spring being sleeved on the slide rod.

[0019] By adopting the above technical solution and the design of the slide bar, the stability of the return spring and the sealing piston during movement is improved.

[0020] Furthermore, the bottom of the mounting sleeve is provided with an annular groove, and the top of the drill bit is fixed with an annular sealing gasket that is inserted into the annular groove.

[0021] By adopting the above technical solution, the annular groove and annular sealing gasket reduce the probability of water flowing out between the drill bit and the installation sleeve.

[0022] In summary, the present invention has the following beneficial effects: In this application, by setting up an installation sleeve, a drill bit, a sampling chamber, a driving mechanism, and a sampling mechanism, the probability of soil entering the water inlet hole and being compacted is reduced, while the device can still perform normal sampling operations. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 2 This is a cross-sectional schematic diagram of an embodiment of the present invention to highlight the internal structure of the mounting sleeve; Figure 3 This is a cross-sectional schematic diagram of an embodiment of the present invention used to highlight the internal structure of the sealed box; Figure 4 yes Figure 2 Enlarged view of point A in the middle; Figure 5 yes Figure 3 Enlarged view of point B in the middle; Figure 6 yes Figure 3 Enlarged diagram of point C in the middle.

[0024] In the diagram: 1. Mounting frame; 2. Limiting tube; 3. Mounting sleeve; 4. Drill bit; 5. Sampling chamber; 6. Water inlet hole; 7. Drive mechanism; 71. Electro-hydraulic push rod; 72. Mounting block; 73. Limiting post; 74. Spiral groove; 8. Sampling mechanism; 81. Sampling assembly; 811. Rectangular rod; 812. Sealing piston; 813. Return spring; 814. Air supply pipe; 815. Slide rod; 82. Air supply assembly; 821. Sealing box; 822. Air supply piston; 823. Air supply rack; 824. Air supply gear; 825. Air supply motor; 9. Winding mechanism; 91. Winding assembly; 911. Fixing frame; 912. Winding drum; 913. Air supply pipe; 92. Rotating assembly; 921. Rotating shaft; 922. Rotating gear; 923. Rotating rack; 10. Annular groove; 11. Annular sealing gasket. Detailed Implementation

[0025] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0026] like Figure 1-6 As shown in the illustration, this application discloses an in-situ sampling device for groundwater organic matter, including a mounting frame 1, a driving mechanism 7, a sampling mechanism 8, and a winding mechanism 9. Four sets of moving wheels are rotatably mounted on the mounting frame 1. A limiting tube 2 is fixed to the bottom of the upper frame of the mounting frame 1, and an installation sleeve 3 that mates with the limiting tube 2 is movably sleeved on the limiting tube 2. A drill bit 4 is provided at the bottom of the installation sleeve 3, fitting snugly against the bottom of the installation sleeve 3. A sampling chamber 5 is provided inside the installation sleeve 3, and multiple water inlet holes 6 are provided through the bottom of the sampling chamber 5 at positions corresponding to the drill bit 4. By adopting the above technical solution, during the sampling process, the driving mechanism 7 first drives the installation sleeve 3 to descend and rotate, causing the drill bit 4 connected to the installation sleeve 3 to descend and drill a hole in the soil until the installation sleeve 3 descends to the groundwater layer. Finally, the sampling mechanism 8 performs groundwater sampling. During the drilling process, because the drill bit 4 blocks the water inlet holes 6, the probability of soil entering and compacting into the water inlet holes 6 is reduced, thus ensuring the normal sampling operation of the device.

[0027] The drive mechanism 7 is mounted on the mounting frame 1 and is used to drive the mounting sleeve 3 to rise, fall, and rotate. The drive mechanism 7 includes an electro-hydraulic push rod 71, a mounting block 72, a limiting post 73, and a spiral groove 74. The electro-hydraulic push rod 71 is fixed to the top of the mounting frame 1. The mounting block 72 is fixed to the push rod end of the electro-hydraulic push rod 71, and the limiting post 73 is rotatably mounted on the inner side wall of the mounting sleeve 3. The mounting sleeve 3 passes through the mounting block 72 and is rotatably connected to it. The side wall of the limiting tube 2 is provided with a spiral groove 74 that slides with the limiting post 73. After the electro-hydraulic push rod 71 is activated, its push rod end extends, causing the mounting block 72 fixed to the push rod end of the electro-hydraulic push rod 71, the mounting sleeve 3 rotatably connected to the mounting block 72, and the limiting post 73 connected to the mounting sleeve 3 to all descend. Since the limiting post 73 is slidably connected to the spiral groove 74, the mounting sleeve 3 drives the drill bit 4 to rotate and drill holes in the soil to ensure normal sampling work.

[0028] The sampling mechanism 8 is mounted on both the mounting bracket 1 and the mounting sleeve 3. The sampling mechanism 8 drives the drill bit 4 to rise and fall, and injects water into the sampling chamber 5 when the drill bit 4 rises. The sampling mechanism 8 includes a sampling assembly 81 and an air supply assembly 82. The sampling assembly 81 includes a rectangular rod 811, a sealing piston 812, a return spring 813, and an air supply pipe 814. The rectangular rod 811 passes through the bottom of the sampling chamber 5 and is slidably connected, with its bottom fixed to the top of the drill bit 4. The sealing piston 812 is slidably connected inside the sampling chamber 5 and fixed to the rectangular rod 811. The return spring 813 is fixed between the top of the sampling assembly 81 and the inner top wall of the sampling chamber 5, and the return spring 813 is rust-proofed. The air supply pipe 814 passes through the bottom of the sampling chamber 5 and is fixed, passing through the limiting tube 2. Air is supplied to the air supply pipe 814 by the air supply assembly 82, increasing the air pressure inside the sampling chamber 5. This causes the sealing piston 812, the rectangular rod 811 connected to the sealing piston 812, and the drill bit 4 connected to the rectangular rod 811 to all descend. The return spring 813 gradually extends until the sealing piston 812 is in contact with the inner bottom wall of the sampling chamber 5. Subsequently, the air is extracted from the air supply pipe 814 by the air supply assembly 82, and the air pressure inside the sampling chamber 5 gradually decreases. The return spring 813 gradually contracts and resets, causing the sealing piston 812, the rectangular rod 811, and the drill bit 4 to all rise. External water enters the sampling chamber 5 through the water inlet hole 6 until the drill bit 4 is in contact with the bottom of the mounting sleeve 3 again, thus completing the sampling operation of the device.

[0029] The air supply assembly 82 supplies air to the air supply pipe 814. The air supply assembly 82 includes a sealing box 821, an air supply piston 822, an air supply rack 823, an air supply gear 824, and an air supply motor 825. The sealing box 821 is located on the top of the mounting bracket 1, and the air supply piston 822 is slidably connected inside the sealing box 821. The air supply rack 823 is fixed to the air supply piston 822, passes through the sealing box 821, and is slidably engaged. The air supply motor 825 is fixed to the top of the mounting bracket 1, and the air supply gear 824 is fixedly sleeved on the output end of the air supply motor 825 and meshes with the air supply rack 823. The air supply pipe 814 is connected to the sealing box 821. After the gas supply motor 825 starts working, it drives the gas supply gear 824 to rotate, causing the gas supply rack 823 meshing with the gas supply gear 824 and the gas supply piston 822 connected to the gas supply rack 823 to move. The gas supply piston 822 compresses the air in the sealed box 821 and increases the pressure inside the sealed box 821. Since the gas supply pipe 814 is connected to the sealed box 821, the pressure inside the sampling chamber 5 is increased. Similarly, after the gas supply motor 825 starts working, it drives the gas supply gear 824 to rotate in the opposite direction, causing the gas supply rack 823 and the gas supply piston 822 to move in the opposite direction, thus reducing the pressure inside the sampling chamber 5.

[0030] The mounting frame 1 is equipped with a winding mechanism 9, which includes a winding assembly 91 and a rotating assembly 92. The winding assembly 91 includes a fixed frame 911, a winding drum 912, and an air supply pipe 913. The fixed frame 911 is fixed to the top of the mounting frame 1 and has a U-shaped structure. The sealing box 821 is fixed to the fixed frame 911, and the air supply pipe 814 is wound around the side wall away from the sampling chamber 5 on the winding drum 912. One end of the air supply pipe 814 near the air supply pipe 913 is fixed and connected to the side wall of the winding drum 912, which is rotatably mounted between the side plates on both sides of the fixed frame 911. The air supply pipe 913 is fixed to the end of the winding drum 912 near the sealing box 821 and is coaxially arranged with the winding drum 912, communicating with the inside of the winding drum 912. The gas supply pipe 913 passes through the fixed frame 911 and is rotatably connected. The gas supply pipe 913 also passes through the sealed box 821 and is rotatably connected, communicating with the interior of the sealed box 821. By rotating the fixed frame 911 using the rotating assembly 92, the gas supply pipe 814 can be released, allowing it to descend along with the mounting sleeve 3. Similarly, by rotating the fixed frame 911 in the opposite direction using the rotating assembly 92, the gas supply pipe 814 can be retracted, allowing it to rise along with the mounting sleeve 3, ensuring the normal operation of the device.

[0031] The rotating assembly 92 drives the winding drum 912 to rotate. The rotating assembly 92 includes a rotating shaft 921, a rotating gear 922, and a rotating rack 923. The rotating shaft 921 is fixed to the end of the winding drum 912 away from the sealing box 821 and is coaxially arranged with the winding drum 912. The rotating gear 922 is fixedly sleeved on the rotating shaft 921. The rotating rack 923 passes through the top of the mounting frame 1 and is slidably engaged. The rotating rack 923 meshes with the rotating gear 922, and the lower end of the rotating rack 923 is fixed to the top of the mounting block 72. During the lifting and lowering of the mounting block 72, the rotating rack 923 connected to the mounting block 72 also lifts and lowers. Because the rotating rack 923 meshes with the rotating gear 922, and the rotating gear 922 is fixedly sleeved on the rotating shaft 921, and the rotating shaft 921 is fixed to the mounting frame 911, the synchronous movement of the mounting sleeve 3 and the drill bit 4 can be achieved.

[0032] The sampling assembly 81 also includes a slide rod 815, which is fixed between the bottom wall and the top wall of the sampling chamber 5. The slide rod 815 is slidably mounted on the sealing piston 812, and a return spring 813 is sleeved on the slide rod 815. The slide rod 815 improves the stability of the return spring 813 and the sealing piston 812 during movement.

[0033] The bottom of the mounting sleeve 3 has an annular groove 10, and the top of the drill bit 4 is fixed with an annular sealing gasket 11 that engages with the annular groove 10. The annular groove 10 and the annular sealing gasket 11 reduce the probability of water flowing out between the drill bit 4 and the mounting sleeve 3.

[0034] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. An underground water organic matter in-situ sampling device, comprising a mounting frame (1) and four sets of moving wheels rotatably mounted on the mounting frame (1), characterized in that: The bottom of the upper frame of the mounting bracket (1) is fixed with a limiting tube (2). The limiting tube (2) is movably sleeved with a mounting sleeve (3) that cooperates with the limiting tube (2). The bottom of the mounting sleeve (3) is provided with a drill bit (4) that fits against the bottom of the mounting sleeve (3). A sampling chamber (5) is provided inside the mounting sleeve (3). Multiple water inlet holes (6) are provided through the bottom of the sampling chamber (5) at the position corresponding to the drill bit (4). The mounting bracket (1) is provided with a drive mechanism (7) for driving the mounting sleeve (3) to rise and rotate. The mounting bracket (1) and the mounting sleeve (3) are jointly provided with a sampling mechanism (8) for driving the drill bit (4) to rise and fall, and injecting water into the sampling chamber (5) when the drill bit (4) rises.

2. The in-situ sampling device for groundwater organic matter according to claim 1, characterized in that: The drive mechanism (7) includes an electric hydraulic push rod (71) fixed to the top of the mounting bracket (1), a mounting block (72) fixed to the end of the push rod of the electric hydraulic push rod (71), and a limiting post (73) rotatably mounted on the inner side wall of the mounting sleeve (3). The mounting sleeve (3) passes through the mounting block (72) and is rotatably connected. The side wall of the limiting tube (2) is provided with a spiral groove (74) that slides with the limiting post (73).

3. The in-situ sampling device for groundwater organic matter according to claim 1, characterized in that: The sampling mechanism (8) includes a sampling component (81), which includes a rectangular rod (811) that is slidably connected to the bottom of the sampling chamber (5). The bottom of the rectangular rod (811) is fixed to the top of the drill bit (4). The sampling component (81) also includes a sealing piston (812) that is slidably connected to the sampling chamber (5) and fixed to the rectangular rod (811), a reset spring (813) that is fixed between the top of the sampling component (81) and the top wall of the sampling chamber (5), and an air supply pipe (814) that is slidably connected to the bottom of the sampling chamber (5) and fixed. The air supply pipe (814) passes through the limiting tube (2). The sampling mechanism (8) also includes an air supply component (82) for supplying air to the air supply pipe (814).

4. The in-situ sampling device for groundwater organic matter according to claim 3, characterized in that: The gas supply assembly (82) includes a sealing box (821) disposed on the top of the mounting frame (1), a gas supply piston (822) slidably connected in the sealing box (821), and a gas supply rack (823) fixed on the gas supply piston (822). The gas supply rack (823) passes through the sealing box (821) and is slidably engaged. The gas supply assembly (82) also includes a gas supply motor (825) fixed on the top of the mounting frame (1) and a gas supply gear (824) fixedly sleeved on the output end of the gas supply motor (825) and meshing with the gas supply rack (823). The gas supply pipe (814) is connected to the sealing box (821).

5. The in-situ sampling device for groundwater organic matter according to claim 4, characterized in that: The mounting frame (1) is provided with a winding mechanism (9), which includes a winding assembly (91). The winding assembly (91) includes a fixed frame (911) fixed to the top of the mounting frame (1) and having a U-shaped structure, a winding drum (912) rotatably mounted between the side plates on both sides of the fixed frame (911), and an air supply pipe (913) fixed to one end of the winding drum (912) near the sealing box (821) and coaxially arranged with the winding drum (912). The sealing box (821) is fixed to the fixed frame (911), and the air supply pipe (913) and the winding drum (912) are connected. 12) Internal connection, the gas supply pipe (913) passes through the fixed frame (911) and is rotatably connected, the gas supply pipe (913) passes through the sealed box (821) and is rotatably connected, the gas supply pipe (913) is internally connected to the sealed box (821), the gas supply pipe (814) is wound around the side wall away from the sampling chamber (5) on the take-up drum (912), the end of the gas supply pipe (814) near the gas supply pipe (913) is fixed and connected to the side wall of the take-up drum (912), the take-up mechanism (9) also includes a rotating component (92) for driving the take-up drum (912) to rotate.

6. The in-situ sampling device for groundwater organic matter according to claim 5, characterized in that: The rotating assembly (92) includes a rotating shaft (921) fixed to one end of the take-up drum (912) away from the sealing box (821) and coaxially arranged with the take-up drum (912), a rotating gear (922) fixedly sleeved on the rotating shaft (921), and a rotating rack (923) that passes through the top of the mounting bracket (1) and is slidably engaged. The rotating rack (923) meshes with the rotating gear (922), and the lower end of the rotating rack (923) is fixed to the top of the mounting block (72).

7. The in-situ sampling device for groundwater organic matter according to claim 3, characterized in that: The sampling assembly (81) also includes a slide rod (815) fixed between the bottom wall and the top wall of the sampling chamber (5). The slide rod (815) is disposed through the sealing piston (812) and slides in cooperation with it. The reset spring (813) is sleeved on the slide rod (815).

8. The in-situ sampling device for groundwater organic matter according to claim 1, characterized in that: The bottom of the mounting sleeve (3) is provided with an annular groove (10), and the top of the drill bit (4) is fixed with an annular sealing gasket (11) that is inserted into the annular groove (10).

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