A sewage sampling device

Abstract

The present invention discloses a sewage sampling device, which includes a sampling cylinder provided with a material taking port and a material discharging port, a first sealing plug for closing the material taking port, a second sealing plug for closing the material discharging port, a first linkage device and a second linkage device installed on the sampling cylinder. The sampling cylinder is connected to the first sealing plug through the first linkage device, and the first sealing plug is connected to the second sealing plug through the second linkage device. The present invention has three working states. The first state is that the first sealing plug is sealingly connected to the material taking port and the second sealing plug is sealingly connected to the material discharging port; the second state is that the first sealing plug leaves the material taking port and the second sealing plug is sealingly connected to the material discharging port; the third state is that the first sealing plug leaves the material taking port and the second sealing plug leaves the material discharging port. The structure of the present invention is simple and the operation is convenient. It can achieve rapid sampling and rapid discharging, and at the same time, the sludge can be fully emptied, and the dredging work is more convenient and efficient, thereby effectively improving the sampling efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of sampling devices, and particularly to a sewage sampling device. Background Art

[0002] As one of the most important components in nature, water bodies are not only indispensable for people's daily lives, but also play an important role in industrial and agricultural production. However, with the development of agriculture, the water bodies in rivers have been severely polluted. In order to restore the healthy state of water bodies, it is usually necessary to collect and test the sewage in rivers.

[0003] Currently, when sampling sewage in rivers, a sampling cylinder is usually used to sample the sewage in the river. Since there is a lot of silt in the river, when sampling in layers, the silt easily enters the sampling cylinder. The cover of the existing sampling cylinder is located inside the sampling cylinder, and it is difficult to pour out the silt after sampling, which affects the reuse of the sampling cylinder. Therefore, we propose a sewage sampling device with a different structure from the existing sampling cylinder. Summary of the Invention

[0004] The purpose of the present invention is to provide a sewage sampling device that is convenient for cleaning silt.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] The present invention provides a sewage sampling device, including a sampling cylinder provided with a material taking port and a discharging port, a first sealing plug for closing the material taking port, a second sealing plug for closing the discharging port, a first linkage device and a second linkage device installed on the sampling cylinder. The sampling cylinder is connected to the first sealing plug through the first linkage device, and the first sealing plug is connected to the second sealing plug through the second linkage device;

[0007] The sewage sampling device has a first working state, a second working state, and a third working state. In the first working state, the first sealing plug is sealingly connected to the material taking port and the second sealing plug is sealingly connected to the discharging port; in the second working state, the first sealing plug leaves the material taking port and the second sealing plug is sealingly connected to the discharging port; in the third working state, the first sealing plug leaves the material taking port and the second sealing plug leaves the discharging port;

[0008] When converting from the first working state to the second working state, the first linkage device drives the first sealing plug away from the material taking port; when converting from the second working state to the third working state, the first linkage device drives the second linkage device to drive the second sealing plug away from the discharge port.

[0009] The sewage sampling device of the present invention is used for sampling river sewage.

[0010] Preferably, the first linkage device includes

[0011] a connecting rod, one end of the connecting rod is fixedly connected to the first sealing plug, and the connecting rod is slidably connected to the sampling cylinder.

[0012] a driving device, the driving device is installed on the sampling cylinder and can drive the connecting rod to slide relative to the sampling cylinder.

[0013] Further preferably, the driving device includes a threaded sleeve rotatably sleeved on the sampling cylinder through a bearing, a turbine sleeved on the outside of the threaded sleeve, a worm meshed with the outside of the turbine, and a driving member fixedly connected to the end of the worm; the connecting rod is provided with threads, the connecting rod is located in the threaded sleeve, and the threads on the connecting rod cooperate with the threads on the threaded sleeve.

[0014] In the present invention, the driving member can be a driving motor, and at the same time, a waterproof shell is added outside the driving motor, or it can be a manually driven handle.

[0015] More preferably, a limiting groove extending along the axial direction of the connecting rod is formed on the connecting rod, and a limiting block is provided on the sampling cylinder, and the limiting block is located in the limiting groove. Through this setting, the connecting rod can be prevented from rotating with the threaded sleeve, so that the connecting rod moves along its axial direction, thereby driving the first sealing plug to move along the axial direction of the connecting rod.

[0016] Preferably, the second linkage device is a telescopic rod, and the telescopic rod includes a first rod fixedly connected to the first sealing plug at one end and a second rod fixedly connected to the second sealing plug at one end. The first rod and the second rod are located between the first sealing plug and the second sealing plug, and the first rod and the second rod are slidably connected. Setting the second linkage device as a telescopic rod has a simple structure and is convenient to set.

[0017] Further preferably, the first rod is sleeved on the second rod. A stop block is provided at the other end of the second rod, and the stop block is always located inside the first rod. A retaining ring capable of blocking the stop block is provided at the other end of the first rod. An extrusion member is provided on the inner wall of the first rod. When the stop block moves relative to the first rod along with the second rod, the stop block is always located between the extrusion member and the retaining ring. The retaining ring can not only cooperate with the stop block to prevent the second rod from detaching from the first rod, but also prevent sludge from entering the first rod and affecting the use of the telescopic rod.

[0018] According to an embodiment, the material taking port is opened at the top of the sampling cylinder, and the discharging port is opened at the bottom of the sampling cylinder. With this arrangement, when discharging, it is not necessary to tilt or turn the sewage sampling device to drain the sludge completely, and the operation is more convenient.

[0019] Preferably, in the first working state and the second working state, the second sealing plug is in interference connection with the discharging port. During the sampling process, the gravity of the sampled sewage and sludge entering through the sampling port is not sufficient to cause the second sealing plug to disengage from the discharging port.

[0020] Further preferably, a first limiting plate is provided on the lower surface of the first sealing plug, and a second limiting plate is provided on the lower surface of the second sealing plug. When the sewage sampling device is in the first working state, the first limiting plate abuts against the lower surface of the top of the sampling cylinder, and the second limiting plate abuts against the lower surface of the bottom of the sampling cylinder. This arrangement can prevent the leakage of materials caused by the accidental detachment of the first sealing plug from the material taking port or the second sealing plug from the discharging port due to misoperation when the sewage device is in the first working state.

[0021] Further preferably, a support frame is provided at the top of the sampling cylinder. The support frame straddles the material taking port, and the first linkage device is installed on the support frame. The central axes of the first linkage device, the first sealing plug, the second linkage device, and the second sealing plug coincide with the central axis of the sampling cylinder. This arrangement can make the sampling device not easily blocked, facilitate material taking and discharging, have a clear structure, be suitable for use, and at the same time, the support frame can also be used as a handle for the sewage sampling device. At the same time, in this embodiment, the moving directions of the first sealing plug and the second sealing plug are consistent with the extending direction of the central axis of the sampling cylinder, the linkage device is simple and efficient, the performance of the whole device is good, and it is convenient and flexible to use.

[0022] Further preferably, a rope connecting part is provided on the support frame. The rope connecting part can be set as a rope connecting ear, which is convenient for using ropes of different lengths to connect the sewage sampling device, so that sewage can be sampled from rivers at different depths. The sampling cylinder is sent into the river through the rope, and accurate sampling can be realized according to the depth position requirements of the river conditions.

[0023] It should be noted that in this article, the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing 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, and therefore cannot be understood as a limitation to the present invention. Figure 1 It should be noted that in this article, relational terms such as first and second are only used 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, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] The structure of the present invention is simple and the operation is convenient. It can achieve rapid sampling and rapid discharging of materials. At the same time, the sludge can be fully emptied, and the dredging work is more convenient and efficient, thereby effectively improving the sampling efficiency.

[0026] BRIEF DESCRIPTION OF THE DRAWINGS FIG.

[0027] is a schematic structural diagram of the sewage sampling device according to a specific embodiment of the present invention; Figure 1 FIG.

[0028] is an internal structural diagram of the sewage sampling device in FIG. Figure 2 FIG. Figure 1 is an enlarged view of area A of the sewage sampling device in FIG.

[0029] FIG. Figure 3 is an enlarged view of area B of the sewage sampling device in FIG. Figure 1 FIG.

[0030] FIG. Figure 4 is an enlarged view of area B of the sewage sampling device in FIG. Figure 1 FIG.

[0031] Appendix Figure 5 is the structural schematic diagram of the first linkage device of the sewage sampling device in the appendix; Figure 1

[0032] Appendix Figure 6 is the structural schematic diagram of the sewage sampling device in the third working state in the appendix; Figure 1

[0033] In the figure: 1, sampling cylinder; 11, material taking port; 12, discharging port; 13, support frame; 14, rope connection part; 2, first sealing plug; 21, first limiting plate; 3, second sealing plug; 31, second limiting plate; 4, first linkage device; 41, connecting rod; 42, threaded sleeve; 43, turbine; 44, worm; 45, driving part; 46, limiting groove; 47, limiting block; 5, second linkage device; 51, first rod; 511, retaining ring; 512, pressing part; 52, second rod; 521, stop block. Specific Embodiments

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] This embodiment is the preferred mode of the sewage sampling device of the present invention. As shown in the appendix Figures 1 to 6 a sewage sampling device includes a sampling cylinder 1 provided with a material taking port 11 and a discharging port 12, a first sealing plug 2 for closing the material taking port 11, a second sealing plug 3 for closing the discharging port 12, a first linkage device 4 and a second linkage device 5 installed on the sampling cylinder 1. The sampling cylinder 1 is connected to the first sealing plug 2 through the first linkage device 4, and the first sealing plug 2 is connected to the second sealing plug 3 through the second linkage device 5.

[0036] ​​Through the arrangement of the first linkage device 4 and the second linkage device 5, the sewage sampling device has a first working state, a second working state, and a third working state. The sewage sampling device is in the first working state both when entering and leaving the sampling position. In this working state, the first sealing plug 2 is sealingly connected to the material taking port 11 and the second sealing plug 3 is in interference connection with the discharge port 12; the state of the sewage device during sampling is the second working state. In this state, the first sealing plug 2 leaves the material taking port 11 and the second sealing plug 3 is sealingly connected to the discharge port 12; the state of the sewage sampling device during discharging is the third working state. In this state, the first sealing plug 2 leaves the material taking port 11 and the second sealing plug 3 leaves the discharge port 12. When converting from the first working state to the second working state, the first linkage device 4 drives the first sealing plug 2 to leave the material taking port 11; when converting from the second working state to the third working state, the first linkage device 4 drives the second linkage device 5 to drive the second sealing plug 3 to leave the discharge port 12.

[0037] Specifically, as shown in Figure 1 , Figure 2 , Figure 6 shown, the sampling cylinder 1 of this embodiment is cylindrical. A circular material taking port 11 is opened at the top of the sampling cylinder 1, and a support frame 13 is provided. The support frame 13 straddles the material taking port 11, and a rope connection part 14 is also provided on the support frame 13. A circular discharge port 12 is opened at the bottom of the sampling cylinder 1. The central axes of the material taking port 11, the support frame 13, and the discharge port 12 coincide with the central axis of the sampling cylinder 1. Of course, in other embodiments, the shape of the sampling cylinder 1, the shapes of the material taking port 11 and the discharge port 12, and their positions on the material taking cylinder can be set according to requirements, as long as the sewage sampling device can have the above three working states. The preferred embodiment has the advantages of simple structure, convenient setting, and convenient and fast sampling and discharging.

[0038] In this embodiment, the first linkage device 4 is installed on the support frame 13, as shown in Figure 4As shown in the figure, the first linkage device 4 includes a connecting rod 41 that can slide relative to the sampling cylinder 1 in the vertical direction and a driving device installed on the support frame 13 for driving the sliding of the connecting rod 41. The lower end of the connecting rod 41 is fixedly connected to the first sealing plug 2, and the connecting rod 41 is provided with threads. The driving device includes a threaded sleeve 42 rotatably sleeved on the sampling cylinder 1 through a bearing, a turbine 43 sleeved on the outside of the threaded sleeve 42, a worm 44 meshed with the outside of the turbine 43, and a driving member 45 fixedly connected to the end of the worm 44. The connecting rod 41 is located in the threaded sleeve 42, and the threads on the connecting rod 41 cooperate with the threads on the threaded sleeve 42. Of course, in other embodiments, other forms of the first linkage device 4 can be used, as long as it can drive the first sealing plug 2 to be hermetically connected to or separated from the material taking port 11. In this embodiment, the driving member 45 is a driving motor, and a waterproof shell is sleeved outside the driving motor to ensure its normal operation in water. In other embodiments, it can also be set as a manually driven handle, and manual driving can be easily used to complete sampling when the river is relatively shallow.

[0039] In this embodiment, as shown in the attached Figure 4 and attached Figure 5 figures, a limiting groove 46 extending along the axial direction of the connecting rod 41 is formed in the connecting rod 41, and a limiting block 47 is fixed on the support frame 13. The limiting block 47 is located in the limiting groove 46. This setting is to prevent the connecting rod 41 from rotating with the threaded sleeve 42 and make the connecting rod 41 move along its axial direction, thereby driving the first sealing plug 2 to move along the axial direction of the connecting rod 41. In other embodiments, whether to set the limiting groove 46 and the limiting block 47 or adopt other forms can be selected according to the situation, as long as it can ensure that the connecting rod 41 can move upward or downward.

[0040] The second linkage device 5 for driving the second sealing plug 3 to be hermetically connected to or separated from the discharge port 12 can be a telescopic rod, including a first rod member 51 with one end fixedly connected to the first sealing plug 2 and a second rod member 52 with one end fixedly connected to the second sealing plug 3. The first rod member 51 and the second rod member 52 are located between the first sealing plug 2 and the second sealing plug 3, and the first rod member 51 and the second rod member 52 are slidably connected. Of course, in other embodiments, other forms of the second linkage device 5 can also be used, as long as it can cooperate with the first linkage device 4 to enable the sewage sampling device to have the above three working states. Preferably, it is set as a telescopic rod to simplify the structure of the sewage sampling device, facilitate production assembly and later maintenance.

[0041] As shown in the attached Figure 3As shown in the figure, in this embodiment, the first rod 51 is sleeved on the second rod 52. The upper end of the first rod 51 is fixedly connected to the first sealing plug 2, the lower end of the first rod 51 is slidably connected to the upper end of the second rod 52. An extrusion member 512 is provided on the inner wall of the first rod 51, and a retaining ring 511 is provided at the lower end of the first rod 51. The lower end of the second rod 52 is fixedly connected to the second sealing plug 3. A stop block 521 is provided at the upper end of the second rod 52. The stop block 521 is always located inside the first rod 51. The retaining ring 511 can block the stop block 521. When the stop block 521 moves relative to the first rod 51 along with the second rod 52, the stop block 521 is always located between the extrusion member 512 and the retaining ring 511. The extrusion member 512 can cooperate with the stop block 521. When the extrusion member 512 moves downward, it squeezes the stop block 521, thereby causing the second rod 52 to slide downward. The retaining ring 511 can prevent the second rod 52 from disengaging from the first rod 51, and can also prevent sludge from entering the first rod 51 and affecting the use of the telescopic rod. Of course, the stop block 521 and the extrusion member 512 can be set as convex blocks or rings, etc.

[0042] In this embodiment, in the first working state and the second working state, the second sealing plug 3 is in interference connection with the discharge port 12. During the sampling process, the gravity of the sampled sewage and sludge entering from the sampling port 11 is not sufficient to cause the second sealing plug 3 to disengage from the discharge port 12.

[0043] As shown in the Figure 6 figure, a first limiting plate 21 is provided on the lower surface of the first sealing plug 2, and a second limiting plate 31 is provided on the lower surface of the second sealing plug. When the sewage sampling device is in the first working state, the first limiting plate 21 abuts against the lower surface of the top of the sampling cylinder 1, and the second limiting plate 31 abuts against the lower surface of the bottom of the sampling cylinder 1.

[0044] As shown in the Figure 6 figure, the central axes of the first sealing plug 2, the connecting rod 41, the second sealing plug 3, and the telescopic rod coincide with the central axis of the sampling cylinder 1, and the moving directions of the first sealing plug 2 and the second sealing plug 3 are consistent with the extending direction of the central axis of the sampling cylinder 1. When the sewage sampling device of this embodiment is switched from the first working state to the second working state, the first linkage device 4 drives the first sealing plug 2 to move downward, and the first rod 51 of the telescopic rod slides downward relative to the second rod 52. During this process, the second sealing plug 3 is in interference connection with the discharge port 12. When the sewage sampling device of this embodiment is switched from the second working state to the third working state, the first linkage device 4 drives the first sealing plug 2 to continue to move downward, so that the extrusion member 512 in the first rod 51 pushes the stop block 521 downward. When the downward pressure applied to the second sealing plug 3 reaches the interference connection extrusion force between the second sealing plug 3 and the discharge port 12, the second sealing plug 3 moves downward and disengages from the discharge port 12.

[0045] The working steps of this embodiment are specifically as follows:

[0046] 1. Before sampling, set the sewage sampling device to the first working state, and then place the sewage sampling device into the river until the sampling cylinder 1 reaches the required sampling depth.

[0047] 2. Adjust the sewage sampling device to the second working state: The driving member 45 operates, causing the worm 44 to drive the turbine 43 to rotate. Then, the threaded sleeve 42 rotates and drives the connecting rod 41 to move downward, driving the first sealing plug 2 away from the material taking port 11. The second sealing plug 3 is in interference fit with the discharge port 12, and sewage enters the sampling cylinder 1 until the required amount of the sample is reached.

[0048] 3. Adjust the sewage sampling device to the first working state: The driving member 45 runs in the reverse direction, causing the worm 44 to drive the turbine 43 to rotate. Then, the threaded sleeve 42 rotates and drives the connecting rod 41 to move upward, driving the first sealing plug 2 close to the material port 11 and sealingly connecting with the material port 11, and taking out the sewage sampling device from the river.

[0049] 4. When discharging, adjust the sewage sampling device to the third working state: The driving member 45 operates, causing the worm 44 to drive the turbine 43 to rotate. Then, the threaded sleeve 42 rotates and drives the connecting rod 41 to move downward, driving the first sealing plug 2 away from the material port 11. At this time, it is in the second working state. Continue to operate the driving member 45, causing the worm 44 to drive the turbine 43 to rotate. Then, the threaded sleeve 42 rotates and drives the connecting rod 41 to move downward, driving the first sealing plug 2 to continue moving downward until the pressing member 512 meets the stop block 521 and pushes the stop block 521 downward, causing the second rod member 52 to press the second sealing plug 3 downward until the second sealing plug 3 is separated from the discharge port 12. Immediately under the action of gravity, the second sealing plug 3 drives the second rod member 52 to slide downward until the stop block 521 meets the retaining ring 511.

[0050] 5. After discharging, adjust the sewage sampling device back to the first working state. The driving member 45 runs in the reverse direction, causing the worm 44 to drive the turbine 43 to rotate. Then, the threaded sleeve 42 rotates and drives the connecting rod 41 to move upward, driving the first sealing plug 2 and the first rod member 51 upward. The retaining ring 511 pulls the stop block 521 upward until the second sealing plug 3 is pulled to the discharge port 12 and is in interference fit with the discharge port 12. At this time, the first sealing plug 2 just moves to the material port 11 and is sealingly connected with the material port 11.

[0051] It should be noted that in this text, relational terms such as first and second are only used 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 term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0052] The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and should not be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A sewage sampling device, characterized in that, It includes a sampling cylinder (1) provided with a material taking port (11) and a material discharging port (12), a first sealing plug (2) for closing the material taking port (11), a second sealing plug (3) for closing the material discharging port (12), a first linkage device (4) and a second linkage device (5) installed on the sampling cylinder (1). The material taking port (11) is opened at the top of the sampling cylinder (1), the material discharging port (12) is opened at the bottom of the sampling cylinder (1). A first limiting plate (21) is provided on the lower surface of the first sealing plug (2), and a second limiting plate (31) is provided on the lower surface of the second sealing plug (3). The sampling cylinder (1) is connected to the first sealing plug (2) through the first linkage device (4), and the first sealing plug (2) is connected to the second sealing plug (3) through the second linkage device (5). The sewage sampling device has a first working state, a second working state and a third working state. In the first working state, the first sealing plug (2) is sealingly connected to the material taking port (11) and the second sealing plug (3) is sealingly connected to the material discharging port (12). The first limiting plate (21) abuts against the lower surface of the top of the sampling cylinder (1), and the second limiting plate (31) abuts against the lower surface of the bottom of the sampling cylinder (1). In the second working state, the first sealing plug (2) leaves the material taking port (11) and the second sealing plug (3) is sealingly connected to the material discharging port (12). In the third working state, the first sealing plug (2) leaves the material taking port (11) and the second sealing plug (3) leaves the material discharging port (12). When converting from the first working state to the second working state, the first linkage device (4) drives the first sealing plug (2) to leave the material taking port (11). When converting from the second working state to the third working state, the first linkage device (4) drives the second linkage device (5) to drive the second sealing plug (3) to leave the material discharging port (12). The first linkage device (4) includes: A connecting rod (41), one end of the connecting rod (41) is fixedly connected to the first sealing plug (2), and the connecting rod (41) is slidably connected to the sampling cylinder (1). A driving device, the driving device is installed on the sampling cylinder (1) and can drive the connecting rod (41) to slide relative to the sampling cylinder (1). The second linkage device (5) described above is a telescopic rod. The telescopic rod includes a first rod member (51) with one end fixedly connected to the first sealing plug (2), and a second rod member (52) with one end fixedly connected to the second sealing plug (3). The first rod member (51) and the second rod member (52) are located between the first sealing plug (2) and the second sealing plug (3), and the first rod member (51) and the second rod member (52) are slidably connected to each other. The first rod member (51) is sleeved on the second rod member (52). A stop block (521) is provided at the other end of the second rod member (52). The stop block (521) is always located inside the first rod member (51). A retaining ring (511) capable of blocking the stop block (521) is provided at the other end of the first rod member (51). An extrusion member (512) is provided on the inner wall of the first rod member (51). When the stop block (521) moves relative to the first rod member (51) along with the second rod member (52), the stop block (521) is always located between the extrusion member (512) and the retaining ring (511).

2. The sewage sampling device according to claim 1, characterized in that, The driving device includes a threaded sleeve (42) rotatably sleeved on the sampling cylinder (1) through a bearing, a turbine (43) sleeved on the outside of the threaded sleeve (42), a worm (44) meshed and connected to the outside of the turbine (43), and a driving member (45) fixedly connected to the end of the worm (44); The connecting rod (41) is provided with threads. The connecting rod (41) is located in the threaded sleeve (42), and the threads on the connecting rod (41) cooperate with the threads on the threaded sleeve (42).

3. The sewage sampling device according to claim 2, wherein A limiting groove (46) extending along the axial direction of the connecting rod (41) is formed in the connecting rod (41). A support frame (13) is provided at the top of the sampling cylinder (1). A limiting block (47) is provided on the support frame (13). The limiting block (47) is located in the limiting groove (46).

4. The sewage sampling device according to claim 1, characterized in that In the first working state and the second working state, the second sealing plug (3) is in interference connection with the discharge port (12).

5. The sewage sampling device according to claim 1, characterized in that, A support frame (13) is provided at the top of the sampling cylinder (1). A rope connecting part (14) is provided on the support frame (13). The support frame (13) straddles the material taking port (11). The first linkage device (4) is installed on the support frame (13). The central axes of the first linkage device (4), the first sealing plug (2), the second linkage device (5), and the second sealing plug (3) coincide with the central axis of the sampling cylinder (1).

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