A leachate sampling device

Abstract

The present invention relates to the technical field of leachate sampling tools, specifically a leachate sampling device, comprising a micro air pump and a measuring cylinder, wherein the measuring cylinder is provided with scale lines, and further comprising: a clutch mechanism, wherein the clutch mechanism is slidably mounted on the measuring cylinder and is used to control the engagement or separation of the clutch mechanism with the measuring cylinder; a support mechanism, wherein the support mechanism is sleeved on the periphery of the measuring cylinder and is connected to the micro air pump and the clutch mechanism, wherein the support mechanism increases its own buoyancy by inflating the micro air pump, and drives the clutch mechanism to float synchronously on the leachate surface. When the staff is sampling the leachate, due to the buoyancy support of the clutch mechanism and the support mechanism and the leachate, and the auxiliary measuring cylinder being perpendicular to the leachate surface, the staff only needs to use a small amount of force to control the measuring cylinder to be perpendicular to the leachate with one hand, and can complete the sampling of the leachate by rotating the annular plate. The operation is simple and the depth control reliability is high.

Description

Technical Field

[0001] The invention relates to the technical field of leachate sampling tools, in particular to a leachate sampling device. Background Art

[0002] With the surge in the amount of municipal solid waste processed, the environmental hazards of landfill leachate are becoming increasingly prominent. As a core part of pollution assessment, stratified leachate sampling requires accurate acquisition of representative samples at different depths. However, existing sampling devices have significant technical bottlenecks in terms of stratification accuracy, anti-pollution mechanisms, and depth control reliability. These bottlenecks severely restrict the scientific nature of test data and the effectiveness of governance decisions, as shown in the following aspects:

[0003] 1. Insufficient stratified sampling precision and sample mixing defects:

[0004] Currently, mainstream sampling devices utilize a fixed sampling rod combined with a bottom container. When the operator inserts the sampling rod into the leachate pool and the container moves up and down through the leachate, different layers of liquid mix at the container's mouth. Experimental studies have shown that approximately 5-10% of the actual sample collected by traditional samplers consists of a mixture of these layers. This phenomenon can severely distort test data in environments with significant pollution stratification (e.g., floating grease in the surface layer, suspended particulate matter in the middle layer, and high concentrations of heavy metals in the bottom layer).

[0005] 2. Sample cross contamination:

[0006] To improve sampling efficiency, those skilled in the art have proposed continuous sampling through a single container. However, this approach carries the risk of irreversible contamination. Colloidal contaminants easily adhere to the inner walls of tubular containers, and the residual rate increases exponentially with the number of uses.

[0007] 3. Poor depth control reliability:

[0008] In order to place the sampling port of the container at the specified depth, the tool needs to be as perpendicular to the liquid surface as possible when sampling the leachate. This means that during the sampling process, the staff must overcome the weight of the tool itself and the instability caused by the buoyancy of the liquid. They must hold the sampling tool firmly with one hand to keep it in a fixed position, while the other hand draws negative pressure for sampling. During this period, the depth of the tool cannot be changed, and the staff's operating experience is directly related to the accuracy of the sample.

[0009] To this end, we propose a leachate sampling device. Summary of the Invention

[0010] In order to solve the above technical problems, the present invention provides a leachate sampling device, comprising a micro air pump and a measuring cylinder, wherein the measuring cylinder is provided with scale lines, and further comprising:

[0011] A clutch mechanism, which is slidably mounted on the measuring cylinder and is used to control the engagement or separation of the clutch mechanism with the measuring cylinder;

[0012] The support mechanism is sleeved on the periphery of the measuring cylinder and is connected to the micro air pump and the clutch mechanism. The support mechanism is inflated by the micro air pump to increase its own buoyancy, driving the clutch mechanism to float synchronously on the surface of the leachate, and assisting the measuring cylinder to be perpendicular to the leachate surface through the clutch mechanism;

[0013] Sampling cylinders, which are provided in a plurality of manners and have an incomplete circular cross section and are arrayed at the lower part of the measuring cylinder;

[0014] A linkage mechanism, which is mounted on the top of the measuring cylinder and connected to the clutch mechanism;

[0015] The sampling mechanism is installed inside the measuring cylinder and is connected to the micro air pump and the linkage mechanism. According to the different rotation angles of the clutch mechanism, the linkage mechanism synchronously drives the sampling mechanism to connect the sampling cylinder at the corresponding position with the leachate and sample the leachate through the negative pressure generated by the micro air pump, or all the sampling cylinders are in a sealed state.

[0016] In some embodiments, the clutch mechanism includes an annular block slidably mounted on the measuring cylinder, the outer wall of the annular block is arrayed with support rods, and the top of the support rods is installed with fixed balls, and the end of the fixed ball away from the support rod is flat and frosted, and the bottom of the annular block is sleeved with a swivel, and the swivel is arrayed with fan-shaped blocks, and adjacent fan-shaped blocks are connected by docking rods, and the inner walls of the fan-shaped blocks are provided with incomplete annular grooves, and they slide with the fixed balls, and the docking rods are sleeved with clamping rods, and the joints of the clamping rods and the docking rods are connected by torsion springs, the top of the clamping rod is an inclined surface, and a rubber block is installed on the inclined surface, and the clamping rod is provided with an arched groove on the side close to the axis of the measuring cylinder, the two sides of the arched groove are far from the axis of the measuring cylinder, and the middle part is close to the axis of the measuring cylinder, and is flat and frosted.

[0017] In some embodiments, the support mechanism includes square grooves opened at the bottom of the outer walls of half of the fan-shaped blocks, and the fan-shaped blocks with square grooves and the fan-shaped blocks without square grooves are arranged alternately. Fan-shaped airbags are installed in the square grooves through rotating shafts, and the fan-shaped airbags are connected to each other through a first hose, and one of the fan-shaped airbags is connected to the air outlet of the micro air pump through a second hose.

[0018] In some embodiments, the linkage mechanism includes an annular plate rotatably mounted on the top of the measuring cylinder, and a multi-stage telescopic rod is arrayed on the bottom surface of the annular plate, and one end of the multi-stage telescopic rod away from the annular plate is fixed to the top surface of one of the sector blocks respectively. An extrusion block is fixed to the bottom of the inner diameter of the annular plate, and the extrusion block is an incomplete ring coaxial with the measuring cylinder, and the side away from the top of the measuring cylinder is an inclined surface. The linkage mechanism also includes a fixed ring arranged inside the measuring cylinder, there are two fixed rings, and a trigger rod is slidably arranged on the fixed ring. The trigger rod passes through the two fixed rings, and the number of the trigger rods is the same as that of the sampling cylinder. An arc block is installed on the end of the trigger rod close to the top of the measuring cylinder, and the arc block is coaxial with the extrusion block and is located on the rotation path of the extrusion block. A fixed plate is installed on the trigger rod, and the fixed plate is located between the two fixing rings and is in contact with the bottom surface of the fixing ring located at the upper position. A spring is sleeved on the trigger rod, one end of the spring is in contact with the fixing plate, and the other end is in contact with the top surface of the fixing ring located below.

[0019] In some embodiments, the sampling mechanism includes a first piston and a second piston sleeved on the trigger rod, the number of the first piston and the second piston is equal to that of the sampling cylinder, the second piston is located at one end of the sampling cylinder close to the bottom of the measuring cylinder, and the surface away from the axis of the measuring cylinder and the surface close to the first piston are provided with second through holes that are interconnected to seal the corresponding end of the sampling cylinder, the first piston is located at the other end of the corresponding sampling cylinder, and the surface close to the axis of the measuring cylinder and the surface close to the second piston are provided with first through holes that are interconnected, the measuring cylinder is coaxially penetrated by an air guide tube, the lower part of the air guide tube is fixed to the surface of the sampling cylinder close to its own axis, and a third through hole is provided between the air guide tube and each sampling cylinder, the third through hole is staggered with the first through hole, the end of the air guide tube close to the top of the measuring cylinder is connected to the air inlet of the micro air pump, the periphery of the micro air pump is wrapped with a hand-held sleeve, and the hand-held sleeve wraps the periphery of the air guide tube close to the micro air pump.

[0020] In some embodiments, a flow guide head is installed at one end of the air guide tube close to the bottom of the measuring cylinder, and the flow guide head is mushroom-shaped.

[0021] In some embodiments, when all the sampling cylinders are sealed by the second piston, the elastic force of the spring on a single trigger rod is equal to the sum of the friction forces between the first piston, the second piston and the inner wall of the corresponding sampling cylinder.

[0022] In some embodiments, the friction force between adjacent segment rods in the multi-stage telescopic rod increases in a step-by-step manner from the top of the measuring tube to the top surface of the sector block, and the length of a single segment rod is 10-20 cm.

[0023] The present invention has at least the following beneficial effects:

[0024] 1. When sampling leachate, the staff only needs to use a small amount of force to control the measuring cylinder to be perpendicular to the leachate with one hand, because the clutch mechanism and the supporting mechanism are supported by the buoyancy of the leachate, and the auxiliary measuring cylinder is perpendicular to the leachate surface. The staff can complete the leachate sampling by rotating the annular plate. The operation is simple and the depth control reliability is high.

[0025] 2. When staff sample leachate at different depths, leachate from each layer enters different sampling tubes respectively, and there is no cross-mixing of leachate throughout the process, thus avoiding inaccurate test results caused by sample mixing;

[0026] 3. The guide head at the top of the airway can effectively prevent liquids at different levels from mixing at the sampling port of the sampling tube, and the detection accuracy of the sample is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 Schematic diagram of the clutch mechanism and support mechanism of the present invention;

[0029] Figure 3 For the present invention Figure 2 Schematic diagram of the structure at A in the middle;

[0030] Figure 4 It is a schematic diagram of the exploded structure of the clutch mechanism and the support mechanism of the present invention;

[0031] Figure 5 It is a schematic diagram of the partial cross-sectional structure of the present invention;

[0032] Figure 6 For the present invention Figure 5 Schematic diagram of the structure at B in the middle;

[0033] Figure 7 Schematic diagram of the internal cross-sectional structure of the present invention;

[0034] Figure 8 For the present invention Figure 7 Schematic diagram of the structure at C in the middle;

[0035] Figure 9 For the present invention Figure 7 Schematic diagram of the structure at point D in the middle.

[0036] In the figure: 1. micro air pump; 2. measuring cylinder; 3. clutch mechanism; 31. annular block; 32. support rod; 33. fixed ball; 34. swivel; 35. sector block; 36. docking rod; 37. clamping rod; 38. rubber block; 39. arched groove; 4. support mechanism; 41. square groove; 42. sector airbag; 43. first hose; 44. second hose; 5. sampling cylinder; 6. linkage mechanism; 61. annular plate; 62. multi-stage telescopic rod; 63. extrusion block; 64. fixing ring; 65. trigger rod; 66. arc block; 67. fixing plate; 68. spring; 7. sampling mechanism; 71. first piston; 72. first through hole; 73. second piston; 74. second through hole; 75. air guide tube; 76. third through hole; 77. hand-held sleeve; 78. flow guide head. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] Example 1:

[0039] See also Figures 1-9 The present invention provides a technical solution: a device for leachate sampling, comprising a micro air pump 1 and a measuring cylinder 2, wherein the measuring cylinder 2 is provided with scale lines, and further comprising:

[0040] A clutch mechanism 3 is slidably mounted on the measuring cylinder 2 and is used to control the clutch mechanism 3 to be in close contact with or separated from the measuring cylinder 2;

[0041] The support mechanism 4 is sleeved on the periphery of the measuring cylinder 2 and is connected to the micro air pump 1 and the clutch mechanism 3. The support mechanism 4 is inflated by the micro air pump 1 to increase its own buoyancy, driving the clutch mechanism 3 to float synchronously on the surface of the leachate, and assisting the measuring cylinder 2 to be perpendicular to the leachate surface through the clutch mechanism 3;

[0042] Sampling tubes 5, which are arranged in a plurality of rows and have an incomplete circular cross section and are arranged in an array at the lower part of the measuring tube 2;

[0043] The linkage mechanism 6 is mounted on the top of the measuring cylinder 2 and connected to the clutch mechanism 3;

[0044] The sampling mechanism 7 is installed inside the measuring cylinder 2 and is connected to the micro air pump 1 and the linkage mechanism 6. According to the different rotation angles of the clutch mechanism 3, the linkage mechanism 6 synchronously drives the sampling mechanism 7 to connect the sampling cylinder 5 at the corresponding position with the leachate and sample the leachate through the negative pressure generated by the micro air pump 1, or all the sampling cylinders 5 are in a sealed state.

[0045] The clutch mechanism 3 includes an annular block 31 slidably mounted on the measuring cylinder 2, and the outer wall of the annular block 31 is arrayed with support rods 32, and the top of the support rods 32 are each mounted with a fixed ball 33. The end of the fixed ball 33 away from the support rod 32 is flat and frosted. The bottom of the annular block 31 is sleeved with a swivel ring 34, and the swivel ring 34 is arrayed with fan-shaped blocks 35. Adjacent fan-shaped blocks 35 are connected by docking rods 36. The inner walls of the fan-shaped blocks 35 are each provided with an incomplete annular groove, and they slide with the fixed balls 33. The docking rods 36 are each sleeved with a clamping rod 37, and the clamping rod 37 and the docking rod 36 are connected at the junction by a torsion spring. The top of the clamping rod 37 is an inclined surface, and a rubber block 38 is mounted on the inclined surface. The clamping rod 37 is provided with an arched groove 39 on the side close to the axis of the measuring cylinder 2. The two sides of the arched groove 39 are far from the axis of the measuring cylinder 2, and the middle part is close to the axis of the measuring cylinder 2, and is flat and frosted.

[0046] When the staff needs to clamp the measuring cylinder 2 through the clutch mechanism 3, any sector block 35 is rotated with the center of the measuring cylinder 2, and the sector block 35 drives the other sector blocks 35 and the clamping rod 37 to rotate synchronously with the axis of the measuring cylinder 2 through the docking rod 36. In this process, due to the restriction of the measuring cylinder 2 on the annular block 31, the annular block 31 can only move along the same trajectory along the axis of the measuring cylinder 2. The staff holds the measuring cylinder 2 with one hand, and the fixed ball 33 at the top of the support rod 32 on the outer wall of the annular block 31 is also fixed. When the fixed ball 33 is in the annular groove on the inner wall of the sector block 35, the sector block 35 and its connecting part rotate smoothly. When the fixing ball 33 is located in the arched groove 39 of the clamping rod 37, the protruding portion of the arched groove 39 is opposite to the fixing ball 33, and the fixing ball 33 will squeeze the clamping rod 37 through the arched groove 39. It should be noted that the height of the arched groove 39 is greater than the diameter of the fixing ball 33 to ensure that the clamping rod 37 can rotate smoothly with the docking rod 36 as the axis. As the clamping rod 37 continues to rotate, when the flat portion of the fixing ball 33 contacts the flat portion in the middle of the arched groove 39, the friction force is significantly increased due to the contact between the frosted surfaces, and the rubber block 38 at the top of the clamping rod 37 clamps the measuring cylinder 2, completing the clamping and fixing of the measuring cylinder 2 by the clutch mechanism 3.

[0047] When the staff needs to release the connection between the clutch mechanism 3 and the measuring cylinder 2 , similarly, they just need to continue rotating any sector block 35 until the fixing ball 33 is located in the annular groove in the sector block 35 .

[0048] The support mechanism 4 includes square grooves 41 opened at the bottom of the outer walls of half of the sector blocks 35. The sector blocks 35 with square grooves 41 and the sector blocks 35 without square grooves 41 are arranged alternately. A sector airbag 42 is installed in the square groove 41 through a rotating shaft. The sector airbags 42 are connected to each other through a first hose 43, and one of the sector airbags 42 is connected to the air outlet of the micro air pump 1 through a second hose 44.

[0049] Before sampling, the staff slides the fixed ring 64 to the first sampling depth, that is, the shallowest depth, clamps the measuring tube 2 through the clutch mechanism 3, and then turns on the micro air pump 1. The micro air pump 1 draws air from the outside, and the air is transported to the inside of the fan-shaped air bag 42 through the second hose 44. With the connection of the first hose 43, the fan-shaped air bag 42 expands, completing the increase of the buoyancy of the support mechanism 4. Then the connection between the fixed ring 64 and the measuring tube 2 can be released, and sampling can begin.

[0050] The linkage mechanism 6 includes an annular plate 61 rotatably mounted on the top of the measuring cylinder 2, and a multi-stage telescopic rod 62 is arrayed on the bottom surface of the annular plate 61. The end of the multi-stage telescopic rod 62 away from the annular plate 61 is fixed to the top surface of one of the sector blocks 35. An extrusion block 63 is fixed to the bottom of the inner diameter of the annular plate 61. The extrusion block 63 is in an incomplete ring shape coaxial with the measuring cylinder 2, and the side away from the top of the measuring cylinder 2 is an inclined surface. The linkage mechanism 6 also includes a fixed ring 64 arranged inside the measuring cylinder 2. There are two fixed rings 64, and a trigger rod 65 is slidably provided on the fixed ring 64. The trigger rod 65 passes through the two fixing rings 64, and the number is the same as that of the sampling tube 5. An arc block 66 is installed at one end of the trigger rod 65 close to the top of the measuring tube 2. The arc block 66 is coaxial with the extrusion block 63 and is located on the rotation path of the extrusion block 63. A fixing plate 67 is installed on the trigger rod 65. The fixing plate 67 is located between the two fixing rings 64 and fits with the bottom surface of the fixing ring 64 located at the upper position. A spring 68 is sleeved on each of the trigger rods 65. One end of the spring 68 fits with the fixing plate 67, and the other end fits with the top surface of the fixing ring 64 located below.

[0051] Since the annular plate 61 is directly connected to the sector block 35 through the multi-stage telescopic rod 62, the ring 34 plate can be directly rotated when controlling the connection and separation between the clutch mechanism 3 and the measuring cylinder 2. During the rotation of the annular plate 61, the squeezing block 63 is also driven to rotate with the axis of the measuring cylinder 2. During the rotation of the squeezing block 63, its inclined surface synchronously squeezes the arc block 66 in contact with it, thereby driving the trigger rod 65 corresponding to the arc block 66 to press down, and the fixed plate 67 on the trigger rod 65 squeezes the spring 68. When the squeezing block 63 is out of contact with the arc block 66, the trigger rod 65 and the arc block 66 are reset under the action of the spring 68.

[0052] The sampling mechanism 7 includes a first piston 71 and a second piston 73 sleeved on the trigger rod 65. The number of the first piston 71 and the second piston 73 is equal to that of the sampling cylinder 5. The second piston 73 is located at one end of the sampling cylinder 5 close to the bottom of the measuring cylinder 2, and a second through hole 74 is opened on the surface away from the axis of the measuring cylinder 2 and the surface close to the first piston 71 to block the corresponding end of the sampling cylinder 5. The first piston 71 is located at the other end of the corresponding sampling cylinder 5, and the surface close to the axis of the measuring cylinder 2 and the surface close to the second piston 7 3 is provided with a first through hole 72 that is interconnected, and an air guide tube 75 is coaxially installed through the measuring cylinder 2. The lower part of the air guide tube 75 is fixed to the surface of the sampling cylinder 5 close to its own axis, and a third through hole 76 is provided between the air guide tube 75 and each sampling cylinder 5. The third through hole 76 is staggered with the first through hole 72. One end of the air guide tube 75 close to the top of the measuring cylinder 2 is connected to the air inlet of the micro air pump 1, and the micro air pump 1 is wrapped with a hand-held sleeve 77. The hand-held sleeve 77 wraps the outer periphery of the air guide tube 75 close to the micro air pump 1.

[0053] A flow guide head 78 is installed at one end of the air guide tube 75 close to the bottom of the measuring cylinder 2. The flow guide head 78 is mushroom-shaped.

[0054] When the sampler moves toward the depth of the leachate, the guide head 78 can effectively prevent the leachate at the current layer from mixing with the leachate at a deeper level.

[0055] The working principle of this embodiment is as follows: before sampling, the staff drives the fan-shaped airbag 42 to expand through the micro air pump 1, then holds the hand-held sleeve 77 with one hand, inserts the measuring cylinder 2 into the leachate pool, and after reaching the first depth, rotates the ring 34-shaped plate with the other hand to complete the connection between the clutch mechanism 3 and the measuring cylinder 2. In this state, the gravity of the sampler is completely offset by the buoyancy generated by the fan-shaped airbag 42. The expanded fan-shaped airbag 42 can also prevent the sampler from directly tipping over in the leachate pool. The staff only needs to make the measuring cylinder 2 perpendicular to the leachate surface through the hand-held sleeve 77. While the annular plate 61 rotates, the trigger rod 65 moves downward to drive the first piston 71 and the second piston 73 to move toward the bottom of the measuring cylinder 2. At this time, the first through hole 72 on the first piston 71 overlaps with the third through hole 76 on the corresponding sampling cylinder 5, and the second piston The second through hole 74 on the surface 73 away from the axis of the measuring tube 2 is in contact with the leachate, that is, the sampling tube 5 and the air guide tube are directly connected to the fan-shaped air bag 42 through the micro air pump 1. The micro air pump 1 is turned on to draw the air in the sampling tube 5 into the fan-shaped air bag 42. At the same time, negative pressure is generated in the sampling tube 5 to sample the leachate. The weight of the overall sampler increases after sampling. Similarly, the fan-shaped air bag 42 is further expanded, increasing the buoyancy, and offsetting each other. After the first depth sampling is completed, the ring 34 plate is continued to rotate, and the extrusion block 63 is disengaged from the contacted arc block 66. The spring 68 drives the trigger rod 65 to reset, closing the sampling tube 5 after sampling. At the same time, the clutch mechanism 3 is released from the measuring tube 2. At this time, the staff can continue to insert the measuring tube 2 downward to the second depth, and repeat the above operation to complete sampling at different depths.

[0056] Example 2:

[0057] Based on Example 1, the present invention further optimizes this solution:

[0058] When all the sampling cylinders 5 are sealed by the second piston 73 , the elastic force of the spring 68 on a single trigger rod 65 is equal to the sum of the friction forces between the first piston 71 and the second piston 73 and the inner wall of the corresponding sampling cylinder 5 .

[0059] When the staff rotates the ring 34-shaped plate and synchronously drives the trigger rod 65 downward to compress the spring 68, the elastic force of the spring 68 will be greater than the sum of the friction forces between the first piston 71 and the second piston 73 and the corresponding inner walls of the sampling tube 5. After the single depth sampling is completed, the spring 68 deforms and drives the trigger rod 65 to just return to its original position. That is to say, in this state, the staff can save the most effort when performing the operation, that is, rotating the ring 34-shaped plate.

[0060] The friction force between adjacent segment rods in the multi-stage telescopic rod 62 increases in a step-by-step manner from the top of the measuring tube 2 to the top surface of the sector block 35 , and the length of a single segment rod is 10-20 cm.

[0061] This can be achieved by adding resistance blocks at the connection points of the segment rods. The closer the segment rods are to the sector blocks 35, the larger the resistance blocks are or the more numerous they are. The length of the segment rods should preferably be a multiple of 10, which is more convenient for calculation. When sampling the depth of the leachate, the depth can be directly judged by the number of shortened segments of the multi-stage telescopic rod 62. With this judgment method, while maintaining the same accuracy, the staff does not need to directly observe the scale lines on the measuring cylinder 2, reducing discomfort during work.

[0062] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0063] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A leachate sampling device, comprising a micro air pump (1) and a measuring cylinder (2), wherein the measuring cylinder (2) is provided with scale lines, and is characterized in that: Also includes: A clutch mechanism (3), the clutch mechanism (3) being slidably mounted on the measuring cylinder (2) and used to control the clutch mechanism (3) to be in close contact with or separated from the measuring cylinder (2); A support mechanism (4), wherein the support mechanism (4) is sleeved on the periphery of the measuring tube (2) and is connected to the micro air pump (1) and the clutch mechanism (3); the support mechanism (4) is inflated by the micro air pump (1) to increase its own buoyancy, thereby driving the clutch mechanism (3) to float synchronously on the surface of the leachate, and assisting the measuring tube (2) to be perpendicular to the leachate surface through the clutch mechanism (3); Sampling tubes (5), there are a plurality of sampling tubes (5), the cross section of which is an incomplete ring, and the sampling tubes (5) are arrayed at a lower position inside the measuring tube (2); A linkage mechanism (6), the linkage mechanism (6) being mounted on the top of the measuring cylinder (2) and connected to the clutch mechanism (3); A sampling mechanism (7), the sampling mechanism (7) is installed inside the measuring cylinder (2) and is connected to the micro air pump (1) and the linkage mechanism (6); The clutch mechanism (3) comprises an annular block (31) slidably mounted on the measuring cylinder (2), the outer wall of the annular block (31) is arrayed with support rods (32), the tops of the support rods (32) are each mounted with a fixed ball (33), the end of the fixed ball (33) away from the support rod (32) is flat and frosted, the bottom of the annular block (31) is sleeved with a rotating ring (34), the rotating ring (34) is arrayed with fan-shaped blocks (35), adjacent fan-shaped blocks (35) are connected by docking rods (36), and the inner walls of the fan-shaped blocks (35) are each An incomplete annular groove is provided, and a sliding fit is formed between the fixed ball (33). The docking rod (36) is sleeved with a clamping rod (37). The clamping rod (37) and the docking rod (36) are connected at their joints by a torsion spring. The top of the clamping rod (37) is an inclined surface, and a rubber block (38) is mounted on the inclined surface. An arched groove (39) is provided on one side of the clamping rod (37) close to the axis of the measuring cylinder (2). Both sides of the arched groove (39) are far from the axis of the measuring cylinder (2), and the middle part is close to the axis of the measuring cylinder (2). The arched groove (39) is flat and frosted. The support mechanism (4) includes square grooves (41) formed on the bottom of the outer walls of half of the sector blocks (35), the sector blocks (35) with the square grooves (41) and the sector blocks (35) without the square grooves (41) are arranged alternately, and sector air bags (42) are installed in the square grooves (41) via a rotating shaft, the sector air bags (42) are connected to each other via a first hose (43), and one of the sector air bags (42) is connected to the air outlet of the micro air pump (1) via a second hose (44); The linkage mechanism (6) includes an annular plate (61) rotatably mounted on the top of the measuring cylinder (2), and a multi-stage telescopic rod (62) is arrayed on the bottom surface of the annular plate (61). The ends of the multi-stage telescopic rod (62) away from the annular plate (61) are respectively fixed to the top surface of one of the sector blocks (35). An extrusion block (63) is fixed to the bottom of the inner diameter of the annular plate (61). The extrusion block (63) is in an incomplete ring shape coaxial with the measuring cylinder (2), and a surface away from the top of the measuring cylinder (2) is an inclined surface. The linkage mechanism (6) also includes a fixed ring (64) arranged inside the measuring cylinder (2). There are two fixed rings (64). A trigger rod (65) is slidably arranged on the fixed ring (64). The trigger rod (65) passes through the two fixing rings (64), and the number is the same as that of the sampling tube (5). An arc block (66) is installed at one end of the trigger rod (65) close to the top of the measuring tube (2). The arc block (66) is coaxial with the extrusion block (63) and is located on the rotation path of the extrusion block (63). A fixing plate (67) is installed on the trigger rod (65). The fixing plate (67) is located between the two fixing rings (64) and fits with the bottom surface of the fixing ring (64) located at the upper position. A spring (68) is sleeved on the trigger rod (65). One end of the spring (68) fits with the fixing plate (67) and the other end fits with the top surface of the fixing ring (64) located below.

2. The leachate sampling device according to claim 1, characterized in that: The sampling mechanism (7) includes a first piston (71) and a second piston (73) sleeved on the trigger rod (65). The number of the first piston (71) and the second piston (73) is equal to that of the sampling cylinder (5). The second piston (73) is located at one end of the sampling cylinder (5) close to the bottom of the measuring cylinder (2), and a second through hole (74) is provided on the surface away from the axis of the measuring cylinder (2) and the surface close to the first piston (71) to be interconnected, so as to block the corresponding end of the sampling cylinder (5). The first piston (71) is located at the other end of the corresponding sampling cylinder (5), and a second through hole (74) is provided on the surface close to the axis of the measuring cylinder (2) and the surface close to the second piston (73). ) is provided with a first through hole (72) that is interconnected, and an air guide tube (75) is coaxially installed through the measuring cylinder (2). The lower part of the air guide tube (75) is fixed to the surface of the sampling cylinder (5) close to its own axis, and a third through hole (76) is provided between the air guide tube (75) and each sampling cylinder (5). The third through hole (76) is staggered with the first through hole (72). One end of the air guide tube (75) close to the top of the measuring cylinder (2) is connected to the air inlet of the micro air pump (1), and the micro air pump (1) is wrapped with a hand-held sleeve (77). The hand-held sleeve (77) wraps the outer periphery of the air guide tube (75) close to the micro air pump (1).

3. The leachate sampling device according to claim 2, characterized in that: A flow guide head (78) is installed at one end of the air guide tube (75) close to the bottom of the measuring cylinder (2), and the flow guide head (78) is mushroom-shaped.

4. The leachate sampling device according to claim 3, characterized in that: When all the sampling cylinders (5) are sealed by the second piston (73), the elastic force of the spring (68) on the single trigger rod (65) is equal to the sum of the friction forces between the first piston (71) and the second piston (73) and the inner wall of the corresponding sampling cylinder (5).

5. The leachate sampling device according to claim 4, characterized in that: The friction force between adjacent segment rods in the multi-stage telescopic rod (62) increases in a step-by-step manner from the top of the measuring tube (2) to the top surface of the sector block (35), and the length of a single segment rod is 10-20 cm.

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