CN220794730U

CN220794730U - Sewage sampling device

Info

Publication number: CN220794730U
Application number: CN202322307729.0U
Authority: CN
Inventors: 孙新展; 李瑞鹏
Original assignee: China Agricultural University
Current assignee: China Agricultural University
Priority date: 2023-08-26
Filing date: 2023-08-26
Publication date: 2024-04-16
Anticipated expiration: 2033-08-26

Abstract

The utility model relates to a sewage treatment technical field specifically discloses a sewage sampling device, and it includes sample bottle, water absorber and sampling head, sample bottle one end is equipped with the connecting pipe, water absorber can dismantle with last connecting pipe and be connected, the sample bottle other end is equipped with down the connecting pipe, still includes coupling hose and fixed subassembly, coupling hose one end is connected with lower connecting pipe through fixed subassembly, the coupling hose other end is connected with the sampling head through fixed subassembly, be equipped with the scale mark on the coupling hose. The present application has the effect of improving the problem that it is difficult to accurately grasp the water intake depth of the sampling device.

Description

Sewage sampling device

Technical Field

The application relates to the technical field of sewage treatment, in particular to a sewage sampling device.

Background

In sewage detection and treatment, sewage sampling is an important step, and the sampling quality can influence subsequent detection and treatment, and the sewage after sampling can be subjected to more targeted sewage treatment according to the detection result by carrying out water quality detection on the sewage after sampling. For sewage near the ground, a worker usually adopts a bucket or a water ladle to directly scrape the sewage, and then pours the sewage into a collection bottle, and the mode is simpler and more direct, but has the defects that when the sewage is taken, the worker needs to squat down to be close to a water source, sometimes smell is bad, and water is easy to splash onto a body, and in addition, the water is easy to adopt a bucket or a water ladle to collect floaters or bottom sediments in the water, so that the water sample detection is influenced.

To this, propose a sampling device among the related art, including sample bottle, water absorber and sampling head, the upper end of sample bottle is equipped with the last connecting pipe of stereoplasm, goes up the connecting pipe and can dismantle with the water absorber and be connected, and the lower extreme of sample bottle is equipped with the lower connecting pipe of stereoplasm, and lower connecting pipe can dismantle with the sampling head and be connected, has seted up the inlet opening on the sampling head, and the inlet opening is arranged in blocking great floater in the water. The sampling device is long in whole after assembly, the sampling head can be directly inserted into water for taking water in a standing state, workers are not required to squat down for taking water, and the defect that sewage is directly scraped by using a bucket or a water ladle is overcome.

For the related art in the above, the lower connecting pipe is a hard connecting pipe, so that the flexibility of the sampling head is poor, the use is inconvenient, and the water taking depth of the sampling device is difficult to accurately grasp, thereby influencing the water sample detection result.

Disclosure of Invention

In order to solve the problem that the water taking depth of the sampling device is difficult to accurately grasp, the application provides a sewage sampling device.

The application provides a sewage sampling device adopts following technical scheme:

the utility model provides a sewage sampling device, includes sample bottle, water absorber and sampling head, sample bottle one end is equipped with the connecting pipe, water absorber can dismantle with last connecting pipe and be connected, the sample bottle other end is equipped with down the connecting pipe, still includes coupling hose and fixed subassembly, coupling hose one end is connected with lower connecting pipe through fixed subassembly, the coupling hose other end is connected with the sampling head through fixed subassembly, be equipped with the scale mark on the coupling hose.

Through adopting above-mentioned technical scheme, when using, hang the sampling head in the surface of water top, then according to the degree of depth adjustment sampling head of sampling requirement submerged depth under water, because sampling head and sample bottle flexonics for the sampling head can be more nimble put into under water, the setting of scale mark is convenient for accurately grasp sampling device's water intaking degree of depth, simple structure, convenient to use.

Optionally, the scale mark includes a plurality of reflective lines distributed along a length direction of the connection hose.

Through adopting above-mentioned technical scheme, when using, the setting of reflection of light lines makes the degree of depth that operating personnel can be more clear observe the sampling head and sink, helps accurate assurance sampling device's water intaking degree of depth.

Optionally, the sampling head is the cylinder structure that both ends were sealed, sampling head one end is equipped with the sleeve pipe that link up with the sampling head inner chamber, sleeve pipe external diameter and coupling hose internal diameter adaptation, a plurality of inlet openings have evenly been seted up on the sampling head perisporium.

Through adopting above-mentioned technical scheme, when using, it establishes on the sleeve pipe and fixed through fixed subassembly to keep away from the one end cover of connecting hose down the connecting pipe, and the sample head is put into behind the aquatic and is absorbed the water sample through the inlet opening, and the inlet opening can prevent that great impurity in the aquatic from getting into the sample bottle, avoids the influence to the testing result.

Optionally, the sampling head is provided with a plurality of in a matched way, and the diameters of water inlet holes of the sampling heads are different.

By adopting the technical scheme, the water inlet holes with different diameters can filter different substances in water, for example, the water inlet holes with larger diameters can be used for filtering broken branches, waterweeds and the like in water; smaller diameter water inlet openings may be used to filter blades, hair, etc. present in the water. Through changing different sampling heads, the substances which want to be detected mainly can be acquired more easily and pertinently, the interference of other substances is avoided, and the accuracy of the detection result is improved.

Optionally, the plurality of sampling heads includes a first sampling head, a second sampling head and a third sampling head, the diameter of the water inlet hole on the first sampling head is smaller than 0.22 μm, the diameter of the water inlet hole on the second sampling head is larger than or equal to 0.22 μm and smaller than or equal to 0.45 μm, and the diameter of the water inlet hole on the third sampling head is larger than 0.45 μm.

By adopting the technical scheme, the water inlet hole with the diameter of 0.45 mu m can prevent fungi from entering, but does not prevent bacteria and viruses from entering, the water inlet hole with the diameter of 0.22 mu m can prevent bacteria from entering, but does not prevent viruses from entering, and the sampling requirements of different microorganisms such as bacteria, fungi and viruses can be met through the arrangement of the apertures of the water inlet holes with the diameters of three different types.

Optionally, the perisporium of sampling head is divided into a plurality of regions from the one end of sampling head to the other end, all distributes in every region has the inlet port, and the diameter of inlet port in the same region is the same, is close to sheathed tube one end from the sampling head to the other end, and the inlet port diameter in the adjacent region increases in proper order, still the cover is equipped with outward the sampling head and is used for sheltering from the shutoff subassembly of the perisporium of sampling head, the shutoff subassembly can be followed the axial displacement of sampling head.

Through adopting above-mentioned technical scheme, the kind that the water inlet of different diameters can filter the aquatic impurity is different, the filtering capability of adjustment water inlet that can adapt to through the position of adjusting the shutoff subassembly removal to can acquire the important material that wants to detect to the needs of detection, prevent to acquire other incoherent materials in the aquatic through the sampling head, reduce the degree of difficulty of detection, improve detection efficiency.

Optionally, the multiple regions are divided into a first region, a second region and a third region from one end of the sampling head, which is close to the sleeve, to the other end, the diameter of the water inlet hole of the first region is smaller than 0.22 μm, the diameter of the water inlet hole of the second region is larger than or equal to 0.22 μm and smaller than or equal to 0.45 μm, and the diameter of the water inlet hole of the third region is larger than 0.45 μm.

By adopting the technical scheme, the water inlet hole smaller than 0.45 mu m can isolate fungi in water, the water inlet hole smaller than 0.22 mu m can isolate bacteria in water and only contains proteins such as viruses and the like to pass through, and the water inlet hole can meet the sampling requirements of different microorganisms such as bacteria, fungi and viruses by being matched with the plugging component.

Optionally, the shutoff subassembly includes the shutoff sleeve, set up the internal thread on the shutoff sleeve inner wall, set up the external screw thread on the sampling head outer wall, shutoff sleeve passes through internal screw thread and external screw thread threaded connection with the sampling head, the length of shutoff sleeve is not less than the length of sampling head.

Through adopting above-mentioned technical scheme, make the sleeve can follow sampling head axial displacement through the rotating sleeve when using to carry out the shutoff to the inlet opening in different regions on the sampling head perisporium, thereby control the isolation of sampling head to different microorganisms such as bacterium, fungi and virus, use threaded connection's mode, simple structure, it is convenient to adjust.

Optionally, the internal diameter of connecting hose and the external diameter adaptation of connecting pipe down, fixed subassembly is including two semicircular splint that the symmetry set up, two semicircular splint one end is rotated through the pivot and is connected, two semicircular splint other end is equipped with the locking piece that is used for locking two semicircular splint jointly, two semicircular splint's internal diameter all with connecting hose external diameter adaptation.

Through adopting above-mentioned technical scheme, when coupling hose, with coupling hose's one end cover on lower connecting pipe, then rotate two semicircular splint and make two semicircular splint cover on coupling hose, rethread locking piece compresses tightly coupling hose and fixes on coupling hose down, and coupling hose locking is firm, simple structure, and is fixed and dismantles all more conveniently.

Optionally, the locking piece includes double-screw bolt and fixation nut, two the one end that the semi-circular splint kept away from the pivot all is equipped with the extension board of outside extension, has seted up on one of them extension board and has dodged the groove, dodged the length direction in groove and extension board extending direction the same, the double-screw bolt is located on another extension board and is passed and dodges the groove, fixation nut and double-screw bolt threaded connection, and rotate fixation nut can support two extension boards and paste.

Through adopting above-mentioned technical scheme, the setting of extension board, double-screw bolt and fixation nut makes two semicircular splint can the at utmost wrap up coupling hose to ensure coupling hose and sample bottle and sampling head homoenergetic sealing connection that can be better. The locking mode of the stud and the fixing nut has simple structure and stable locking.

1. Through increasing coupling hose between sample bottle and sampling head to through fixed subassembly respectively with sample bottle and sampling head fixed connection make the sampling head can be more nimble put into under water, and through setting up the scale mark on coupling hose and make the water intaking degree of depth that can be more accurate assurance sampling device, thereby improve the reliability of testing result;

2. the water inlet hole smaller than 0.45 mu m can isolate fungi in water, the water inlet hole smaller than 0.22 mu m can isolate bacteria in water and only contains proteins such as viruses and the like to pass through, and the sampling heads with different water inlet hole diameters are arranged in a matching way, so that the sampling requirements of different microorganisms such as bacteria, fungi and viruses can be met by replacing the sampling heads;

3. the water inlet holes with different diameters can filter different substances in water, through setting up the water inlet hole area of three kinds of different water inlet hole diameters on the peripheral wall of the sampling head, and the collocation can shelter from the shutoff subassembly of the peripheral wall of the sampling head, make the size of the water inlet hole of the sampling head can be adjusted through adjusting the position of shutoff subassembly, thereby can acquire the target substance that needs to detect more easily, improve detection efficiency.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of the overall structure of embodiment 1 of the present application;

FIG. 2 is a schematic cross-sectional view of embodiment 1 of the present application;

FIG. 3 is a schematic structural view of a fixing assembly in embodiment 1 of the present application;

FIG. 4 is a schematic overall structure of embodiment 2 of the present application;

fig. 5 is a schematic diagram of an explosion structure of the sampling head and the plugging sleeve in embodiment 2 of the present application, which is intended to show a connection relationship between the plugging sleeve and the sampling head.

Reference numerals: 1. sampling bottle; 11. an upper connecting pipe; 12. a lower connecting pipe; 2. a water absorber; 21. a water-absorbing outer cylinder; 22. a piston; 23. a pull rod; 24. a handle; 25. a connecting cylinder; 3. a sampling head; 31. a sleeve; 32. a water inlet hole; 33. a first region; 34. a second region; 35. a third region; 36. a plugging assembly; 361. plugging the sleeve; 3611. an internal thread; 3612. anti-skid lines; 37. an external thread; 4. a connecting hose; 5. a fixing assembly; 51. a semicircular clamping plate; 52. a rotating shaft; 53. an extension plate; 531. an avoidance groove; 54. a locking member; 541. a stud; 542. a fixing nut; 55. a convex strip; 6. graduation marks.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-5.

Example 1:

embodiment 1 of the application discloses a sewage sampling device. Referring to fig. 1-2, the sewage sampling device includes sample bottle 1, absorber 2, sampling head 3, coupling hose 4 and fixed subassembly 5, and sample bottle 1 is the transparent columnar cup structure that both ends were sealed, is equipped with the volume on the periphery wall of sample bottle 1, and sample bottle 1 top integrated into one piece has the last connecting pipe 11 that link up the inner chamber of sample bottle 1, and sample bottle 1 bottom integrated into one piece has the lower connecting pipe 12 that link up the inner chamber of sample bottle 1, and absorber 2 can dismantle with last connecting pipe 11 and be connected. One end of a connecting hose 4 is fixedly connected with a lower connecting pipe 12 through a fixing component 5, the other end of the connecting hose 4 is fixedly connected with a sampling head 3 through the fixing component 5, the connecting hose 4 is made of flexible materials, the inner diameter of the connecting hose 4 is identical to the outer diameter of the lower connecting pipe 12, graduation marks 6 are arranged on the peripheral wall of the connecting hose 4 along the length direction of the connecting hose 4, and the graduation marks 6 are printed on the outer surface of the connecting hose 4 by adopting reflective paint. When the manual handheld water absorber 2 is used, the sampling head 3 is suspended above the water surface, the sampling head 3 sags under the action of self gravity, the scale mark 6 of the connecting hose 4 is observed according to the depth required by sampling, the depth of the sampling head 3 sinking into the water surface is adjusted, and then the water to be detected is sucked into the sampling bottle 1 through the water absorber 2. Through increasing coupling hose 4 between sample bottle 1 and sampling head 3 for sampling head 3 can put into under water more nimble, and setting up of scale mark 6 on coupling hose 4 makes the operator can be more accurate grasp water intaking degree of depth, improves the accuracy of sampling result.

The water absorber 2 comprises a water absorbing outer cylinder 21, the water absorbing outer cylinder 21 is a cylinder with a bottom and an opening at one end, a piston 22 is arranged in the water absorbing outer cylinder 21 in a sliding manner along the length direction, the outer diameter of the piston 22 is the same as the inner diameter of the water absorbing outer cylinder 21, one side, close to the opening of the water absorbing outer cylinder 21, of the piston 22 is connected with a pull rod 23, the length direction of the pull rod 23 is the same as the length direction of the water absorbing outer cylinder 21, the length of the pull rod 23 is not less than that of the water absorbing outer cylinder 21, and one end, extending out of the opening of the water absorbing outer cylinder 21, of the pull rod 23 is connected with a handle 24. One end of the water absorbing outer cylinder 21 far away from the opening is integrally formed with a connecting cylinder 25 penetrating through the inner cavity of the water absorbing outer cylinder 21, and the inner wall of the connecting cylinder 25 is in threaded connection with the outer wall of the upper connecting pipe 11.

The sampling head 3 is in a cylindrical shape with two sealed ends, a sleeve 31 communicated with the inner cavity of the sampling head 3 is integrally formed on one end face of the sampling head 3, the outer diameter of the sleeve 31 is the same as the inner diameter of the connecting hose 4, and a plurality of water inlets 32 are uniformly formed in the peripheral wall of the sampling head 3. The sampling head 3 is made of stainless steel, so that on one hand, the underwater operation sampling head 3 is prevented from rusting, and on the other hand, the sampling head 3 is convenient to sink into water rapidly. When the sampling head 3 and the sampling bottle 1 are connected, one end of the connecting hose 4 is sleeved on the lower connecting pipe 12 of the sampling bottle 1, the other end of the connecting hose 4 is sleeved on the sleeve 31 of the sampling head 3, and then the connecting hose and the sleeve are respectively fixed through the fixing component 5. The sampling head 3 can prevent the garbage such as branches, pasture and water existing in water from entering the sampling bottle 1 through the arrangement of the water inlet hole 32, so that the influence on the detection result is avoided.

Further, the supporting three kinds of being provided with of sampling head 3 of this application sewage sampling device is first sampling head, second sampling head and third sampling head respectively, and the diameter size difference that lies in inlet opening 32 of each kind of sampling head 3 is different, and the internal diameter size of three kinds of sampling head 3 inlet opening 32 is respectively: the diameter of the water inlet hole (32) on the first sampling head is smaller than 0.22 mu m, the diameter of the water inlet hole (32) on the second sampling head is larger than or equal to 0.22 mu m and smaller than or equal to 0.45 mu m, and the diameter of the water inlet hole (32) on the third sampling head is larger than 0.45 mu m. The 0.45 mu m water inlet hole 32 can prevent fungi from entering, but does not prevent bacteria and viruses from entering, the 0.22 mu m water inlet hole 32 can prevent bacteria from entering, but does not prevent viruses from entering, and the sampling requirements of bacteria, fungi, viruses and other different microorganisms can be met by arranging three sampling heads 3 with different diameters of the water inlet holes 32 in a matching way.

Referring to fig. 3, the fixing assembly 5 includes two semicircular clamping plates 51 symmetrically arranged, one ends of the two semicircular clamping plates 51 are rotatably connected through a rotating shaft 52, the two semicircular clamping plates 51 can be enclosed into a complete circle through rotation, and the inner diameters of the two semicircular clamping plates 51 are identical to the outer diameter of the connecting hose 4. The two semicircular clamping plates 51 are outwards extended at one ends far away from the rotating shaft 52 and are integrally formed with extension plates 53, locking pieces 54 are arranged on the two extension plates 53 together, each locking piece 54 comprises a stud 541 and a fixing nut 542, each stud 541 is fixedly welded on one extension plate 53, an avoidance groove 531 is formed in the other extension plate 53, and the length direction of each avoidance groove 531 is identical to the extension direction of the corresponding extension plate 53. When the two semicircular clamping plates 51 are in the enclosing state, the studs 541 pass through the avoiding grooves 531, the fixing nuts 542 are in threaded connection with the studs 541, and the two extending plates 53 can be abutted and fixed by screwing the fixing nuts 542. After one end of the connecting hose 4 is sleeved on the lower connecting pipe 12 and the other end is sleeved on the sleeve 31, two semicircular clamping plates 51 are respectively correspondingly sleeved on the connecting hose 4 outside the lower connecting pipe 12 and outside the sleeve 31, and fixing nuts 542 are screwed, so that the connecting hose 4 is respectively fixed with the lower connecting pipe 12 and the sleeve 31. In addition, in order to prevent the connection hose 4 from being pulled out, the inner walls of the two semicircular clamping plates 51 are provided with protruding strips 55.

The implementation principle of the sewage sampling device in the embodiment of the application is as follows: when the sewage sampling device is assembled, the sampling bottle 1 is in threaded connection with the connecting cylinder 25 of the water absorber 2 through the upper connecting pipe 11, one end of the connecting pipe is sleeved on the peripheral wall of the lower connecting pipe 12 of the sampling bottle 1 and is fixed through the fixing component 5, and then the other end of the connecting pipe is sleeved on the peripheral wall of the sleeve 31 of the sampling head 3 and is fixed through the fixing component 5. When in use, the sampling head 3 is firstly hung above the water surface, then the scale marks 6 on the connecting hose 4 are observed according to the required depth of sampling, the depth of the sampling head 3 sinking into the water is adjusted, and then the pull rod 23 of the water absorber 2 is pulled to suck water into the sampling bottle 1. In order to detect bacteria, fungi, viruses and other different microorganisms in water, the sampling head 3 with different diameters of the water inlet 32 is only required to be replaced in an adaptive manner.

Example 2:

embodiment 2 of the present application discloses a sewage sampling device, its difference with this application embodiment 1 is that referring to fig. 4-5, sampling head 3 is provided with only one kind, the perisporium of sampling head 3 divide into three region from the one end of sampling head 3 to the other end, all distribute in every region and have inlet port 32, and the inlet port diameter in same region is the same, is close to the one end of sleeve pipe 31 from sampling head 3 to the other end, the inlet port 32 diameter in the adjacent region increases in proper order, is first region 33, second region 34 and third region 35 respectively. The diameter of the water inlet 32 of the first region 33 is smaller than 0.22 μm, the diameter of the water inlet 32 of the second region 34 is larger than or equal to 0.22 μm and smaller than or equal to 0.45 μm, and the diameter of the water inlet 32 of the third region 35 is larger than 0.45 μm. Be provided with the shutoff subassembly 36 that is used for sheltering from the perisporium of sampling head 3 on the sampling head 3, shutoff subassembly 36 includes shutoff sleeve 361, has seted up internal thread 3611 on the shutoff sleeve 361 inner wall, has seted up external screw thread 37 on the sampling head 3 outer wall, and shutoff sleeve 361 cover is on sampling head 3 perisporium and with sampling head 3 threaded connection, and the length of shutoff sleeve 361 is not less than the length of sampling head 3. In addition, in order to facilitate the rotation of the plugging sleeve 361, a plurality of anti-slip patterns 3612 are uniformly distributed on the outer wall of the plugging sleeve 361. In other embodiments, the plugging assembly may also employ a sliding sleeve having an inner diameter equal to the outer diameter of the sampling head 3, and the purpose of shielding the water inlet 32 on the peripheral wall of the sampling head 3 is achieved by sliding the sliding sleeve axially along the sampling head 3.

The implementation principle of the sewage sampling device in the embodiment of the application is as follows: the rotation of the plugging sleeve 361 enables the plugging sleeve 361 to sequentially cover the third area 35, the second area 34 and the first area 33, and when water inlet holes 32 with different diameters are needed to meet the sampling requirements of different microorganisms such as bacteria, fungi and viruses, only the corresponding areas are needed to be covered by the rotation of the plugging sleeve 361, so that the plugging sleeve is simple in structure and convenient to use.

Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The terms "first," "second," "third," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. The terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, is intended to mean that elements or items that are present in front of "comprising" or "comprising" are included in the word "comprising" or "comprising", and equivalents thereof, without excluding other elements or items. "upper", "lower", "left", "right", etc. are used merely to denote relative positional relationships, which may also change accordingly when the absolute position of the object to be described changes.

The foregoing are all optional embodiments of the present application, and are not intended to limit the scope of the present application in this way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims

1. The utility model provides a sewage sampling device, includes sample bottle (1), water absorber (2) and sampling head (3), sample bottle (1) one end is equipped with connecting pipe (11), water absorber (2) can dismantle with last connecting pipe (11) and be connected, the sample bottle (1) other end is equipped with connecting pipe (12), its characterized in that: still include coupling hose (4) and fixed subassembly (5), coupling hose (4) one end is connected with lower connecting pipe (12) through fixed subassembly (5), the coupling hose (4) other end is connected with sampling head (3) through fixed subassembly (5), be equipped with scale mark (6) on coupling hose (4).

2. A sewage sampling device according to claim 1, wherein: the scale lines (6) comprise a plurality of reflective lines distributed along the length direction of the connecting hose (4).

3. A sewage sampling device according to claim 1, wherein: the sampling head (3) is of a cylindrical structure with two sealed ends, a sleeve (31) communicated with the inner cavity of the sampling head (3) is arranged at one end of the sampling head (3), the outer diameter of the sleeve (31) is matched with the inner diameter of the connecting hose (4), and a plurality of water inlets (32) are uniformly formed in the peripheral wall of the sampling head (3).

4. A sewage sampling device according to claim 3, wherein: the sampling head (3) is provided with a plurality of water inlets (32) with different diameters, and the water inlets are different from the sampling head (3).

5. The wastewater sampling device of claim 4, wherein: the plurality of sampling heads (3) comprise a first sampling head, a second sampling head and a third sampling head, the diameter of a water inlet hole (32) on the first sampling head is smaller than 0.22 mu m, the diameter of the water inlet hole (32) on the second sampling head is larger than or equal to 0.22 mu m and smaller than or equal to 0.45 mu m, and the diameter of the water inlet hole (32) on the third sampling head is larger than 0.45 mu m.

6. A sewage sampling device according to claim 2, wherein: the perisporium of sampling head (3) is divided into a plurality of regions from the one end of sampling head (3) to the other end, all distributes in every region has inlet opening (32), and the diameter of inlet opening (32) in the same region is the same, is close to one end of sleeve pipe (31) from sampling head (3) to the other end, and inlet opening (32) diameter in the adjacent region increases in proper order, still the cover is equipped with outside sampling head (3) and is used for sheltering from shutoff subassembly (36) of perisporium of sampling head (3), shutoff subassembly (36) can be followed the axial displacement of sampling head (3).

7. The wastewater sampling device of claim 6, wherein: the multiple areas are divided into a first area (33), a second area (34) and a third area (35) from one end of the sampling head (3) close to the sleeve (31) to the other end, the diameter of a water inlet hole (32) of the first area (33) is smaller than 0.22 mu m, the diameter of the water inlet hole (32) of the second area (34) is larger than or equal to 0.22 mu m and smaller than or equal to 0.45 mu m, and the diameter of the water inlet hole (32) of the third area (35) is larger than 0.45 mu m.

8. The wastewater sampling device of claim 6, wherein: the plugging assembly (36) comprises a plugging sleeve (361), an internal thread (3611) is formed in the inner wall of the plugging sleeve (361), an external thread (37) is formed in the peripheral wall of the sampling head (3), the plugging sleeve (361) is in threaded connection with the sampling head (3) through the internal thread (3611) and the external thread (37), and the length of the plugging sleeve (361) is not smaller than that of the sampling head (3).

9. A sewage sampling device according to claim 1, wherein: the inner diameter of the connecting hose (4) is matched with the outer diameter of the lower connecting pipe (12), the fixing assembly (5) comprises two semicircular clamping plates (51) which are symmetrically arranged, one ends of the semicircular clamping plates (51) are rotationally connected through a rotating shaft (52) and can be enclosed to form a complete circle, locking pieces (54) used for locking the two semicircular clamping plates (51) are arranged at the other ends of the semicircular clamping plates (51) together, and the inner diameters of the semicircular clamping plates (51) are matched with the outer diameter of the connecting hose (4).

10. A sewage sampling device according to claim 9, wherein: the locking piece (54) comprises a stud (541) and a fixing nut (542), one end, far away from the rotating shaft (52), of each semicircular clamping plate (51) is provided with an extending plate (53) which extends outwards, an avoidance groove (531) is formed in one extending plate (53), the length direction of the avoidance groove (531) is the same as the extending direction of the extending plate (53), the stud (541) is arranged on the other extending plate (53) and penetrates through the avoidance groove (531), the fixing nut (542) is in threaded connection with the stud (541), and the fixing nut (542) rotates to enable the two extending plates (53) to abut against each other.