Quantitative water sampler

Abstract

A water body quantitative sampler belongs to the technical field of liquid sampling devices, and comprises: a sleeve having a cylindrical hole structure inside and provided with a through hole in the middle of the side wall; the lead screw is coaxially arranged at the upper end of the interior of the sleeve, the sleeve is provided with a closed space and used for installing a motor for driving the lead screw to rotate, a strip-shaped groove is formed in the lower end of the lead screw, a pair of shifting pieces are rotationally arranged in the strip-shaped groove, an elastic piece is arranged between the two shifting pieces, and the lower ends of the two shifting pieces face the lower portion of the lead screw; the sampling disc is of a disc structure, a plurality of counter bores are formed in the outer wall of the sampling disc along the circumference, as shown in the figure 3 and the figure 6, the minimum distance between the side walls of the counter bores and the top face and the bottom face of the sampling disc is larger than the radius of the through hole, threaded holes are coaxially formed in the sampling disc, spline holes are coaxially formed in the upper ends of the threaded holes, and the inner diameter of a circle formed by tooth crests of the spline holes is larger than the small diameter of the threaded holes. According to the scheme, water body samples at different depths can be quantitatively and independently collected, mutual influence among the samples can be effectively avoided, and the accuracy of a detection structure is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of liquid sampling devices, and in particular relates to a water body quantitative sampler. Background Art

[0002] In order to understand the chemical, physical and biological characteristics of water bodies, environmental monitoring or scientific research units often need to sample and test water bodies such as lakes, ponds, rivers, etc. In order to more conveniently sample water bodies of different depths to obtain more accurate test results, the patent with application number CN202210620407.9 discloses a water quality sampling device for environmental monitoring, which uses a telescopic arm, a winding motor and a sling to control the depth of the sampling mechanism, and then uses a connecting pipe to inject water samples of different depths into a collection bottle to achieve the purpose of collecting water bodies of different depths. However, the overall structure of this technical solution is relatively complex, and although this solution collects water bodies of different depths using different collection bottles, the water samples are all transmitted through the same connecting pipe, which easily causes samples of different depths to affect each other and affect the test results of samples of different depths. Summary of the invention

[0003] In order to solve the deficiencies of the prior art, the present invention provides a water quantitative sampler, which can quantitatively and independently collect water samples of different depths, effectively avoid mutual influence between samples, and ensure the accuracy of the detection structure.

[0004] In order to achieve the purpose of the present invention, the following scheme is proposed: A water quantitative sampler, comprising: The casing has a cylindrical hole structure inside and a through hole is opened in the middle of its side wall; The screw rod is coaxially arranged at the upper end of the sleeve. The sleeve is provided with a closed space for installing a motor driving the screw rod to rotate. A strip groove is provided at the lower end of the screw rod. A pair of paddles are rotatably arranged in the strip groove. An elastic member is provided between the two paddles. The lower ends of the two paddles face downwards of the screw rod. The sampling plate is a disc structure, and its outer wall is provided with a plurality of countersunk holes along the circumference, such as Figure 3 , Figure 6 As shown, the minimum distance between the side wall of the countersunk hole and the top and bottom surfaces of the sampling disk is greater than the radius of the through hole, the sampling disk is coaxially provided with a threaded hole, and the upper end of the threaded hole is coaxially provided with a spline hole, and the circular inner diameter formed by the tooth top is greater than the minor diameter of the threaded hole; In the assembled state, multiple sampling disks are coaxially inserted into the casing, with intervals between adjacent sampling disks. A sliding sealing structure is provided between the outer wall of the sampling disk and the inner wall of the casing. The screw rod passes through the threaded hole, and the spline hole faces the upper end of the screw rod. The friction between the outer wall of the sampling disk and the inner wall of the casing is greater than the friction between the screw rod and the threaded hole. When the pick is inserted into the tooth groove of the spline hole, the countersunk hole and the through hole are at the same height, and the lower end of the screw rod is separated from the threaded hole.

[0005] The beneficial effects of the present invention are as follows: the present scheme utilizes the sink holes opened on the periphery of the sampling plate to quantitatively collect water samples, and each sampling plate is independent of each other, effectively avoiding mutual interference between samples; the present scheme can not only use water samples of different depths, but also can utilize the sink holes to quantitatively collect multiple samples at the same depth to ensure sufficient test samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present invention.

[0007] Figure 1 The external structure diagram of the preferred solution of the present application is shown.

[0008] Figure 2 A cross-sectional view of the present application is shown when the sampling disc is sampling.

[0009] Figure 3 Shows Figure 2 A partial enlarged view of point A in the middle.

[0010] Figure 4 A cross-sectional view of the connection between the retaining ring and the sleeve is shown.

[0011] Figure 5 A cross-sectional view of the present application is shown when adjacent sampling disks use side walls to block through holes.

[0012] Figure 6 Shows Figure 5 A partial enlarged view of point B in the middle.

[0013] Figure 7 A schematic diagram of the installation structure of the paddle at the bottom of the screw rod is shown.

[0014] Figure 8 A schematic diagram of the internal structure of the sampling disk when the paddle cooperates with the spline hole is shown.

[0015] Markings in the figure: sleeve-1, through hole-101, motor-11, capacitor-12, sensor-13, upper tube-14, cover plate-15, lower tube-16, screw-2, strip groove-201, paddle-21, elastic member-22, sampling plate-3, countersunk hole-301, threaded hole-302, spline hole-303, sealing ring-31, rubber ring-32, induction ring-33, retaining ring-4, round tube-41, drainage hole-411, circular ring-42, push plate-5. DETAILED DESCRIPTION

[0016] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the implementation modes of the present invention are described in detail below with reference to the accompanying drawings. However, the embodiments described in the present invention are only part of the embodiments of the present invention, rather than all the embodiments.

[0017] like Figures 1 to 3 as well as Figures 5 to 8 As shown, a water quantitative sampler includes: a sleeve 1, a screw rod 2 and a plurality of sampling discs 3.

[0018] The interior of the sleeve 1 is a cylindrical hole structure, and a through hole 101 is opened in the middle of the side wall.

[0019] The screw rod 2 is coaxially arranged at the upper end of the sleeve 1. The sleeve 1 is provided with a closed space for installing a motor 11 that drives the screw rod 2 to rotate. As a preferred solution, a capacitor 12 is also provided in the closed space to provide electrical energy to the motor 11, or the motor 11 is directly energized by a cable. A strip groove 201 is provided at the lower end of the screw rod 2. A pair of paddles 21 are rotatably provided in the strip groove 201. The rotation axis of the paddle 21 is perpendicular to the side wall of the strip groove 201. An elastic member 22 is provided between the two paddles 21. The lower ends of the two paddles 21 are movable ends, and their lower ends face the bottom of the screw rod 2.

[0020] The sampling disk 3 is a disk structure, and a plurality of countersunk holes 301 are opened along the circumference of the outer wall. Figure 3 , Figure 6 As shown, the minimum distance between the side wall of the countersunk hole 301 and the top and bottom surfaces of the sampling disk 3 is greater than the radius of the through hole 101, so that the wall thickness of two adjacent sampling disks 3 can be used to block the through hole 101. As a preferred solution, the countersunk holes 301 are all round holes for easy installation, and the axis of the countersunk hole 301 is consistent with the radial direction of the sampling disk 3, and the countersunk holes 301 are arranged in a circular array along the sampling disk 3, and the sampling disk 3 is coaxially provided with a threaded hole 302, and the upper end of the threaded hole 302 is coaxially provided with a spline hole 303, and the circular inner diameter formed by the tooth top is larger than the minor diameter of the threaded hole 302.

[0021] like Figure 2 , Figure 3 As shown, in the assembled state, multiple sampling disks 3 are coaxially inserted into the sleeve 1, and there is a gap between adjacent sampling disks 3. A sliding sealing structure is provided between the outer wall of the sampling disk 3 and the inner wall of the sleeve 1. The screw rod 2 passes through the threaded hole 302, and the spline hole 303 faces the upper end of the screw rod 2; when the paddle 21 is inserted into the tooth groove of the spline hole 303, the countersunk hole 301 and the through hole 101 are in the same position along the axial direction of the sleeve 1, and the lower end of the screw rod 2 is separated from the threaded hole 302; there is a predetermined friction force between the outer wall of the sampling disk 3 and the inner wall of the sleeve 1, specifically, the friction force includes friction force along the axial direction and circumferential direction of the sleeve 1, and the friction force is greater than the friction force between the screw rod 2 and the threaded hole 302 when it rotates.

[0022] Specifically, Figure 5 , Figure 6 As shown, when the paddle 21 is located inside the threaded hole 302, under the squeezing action of the threaded hole 302, the lower ends of the two paddles 21 are retracted toward the middle, and the elastic member 22 is in a compressed state. In this way, the paddle 21 cannot affect the fit between the screw rod 2 and the threaded hole 302. When the screw rod 2 rotates, the sampling disk 3 can move along the axial direction of the sleeve 1 under the pushing action of the threaded structure.

[0023] like Figure 3 , Figure 8 As shown, when the paddle 21 is inside the spline hole 303, since the internal size of the spline hole 303 is larger than the internal size of the threaded hole 302, the elastic member 22 will push the paddle 21 outward under the action of elastic force, thereby pushing the outer side of the lower end of the paddle 21 to be stuck in the tooth groove of the spline hole 303, and then continuing to rotate the screw rod 2 can drive the sampling disk 3 to rotate around the axis.

[0024] Combination Figure 2 , Figure 3 , Figure 5 , Figure 6 and Figure 8 As shown, the specific sampling process of the above scheme is as follows: The upper end of the casing 1 is connected by a rope or a rod, and the casing 1 is placed in the water body by the rope or the rod. When the predetermined sampling depth is reached, the motor 11 is started to drive the screw 2 to rotate. Because there is a predetermined friction force between the outer wall of the sampling disk 3 and the inner wall of the casing 1 in the circumferential direction, and the friction force is greater than the friction force between the screw 2 and the threaded hole 302 when the screw 2 rotates, the sampling disk 3 will not rotate with the screw 2, but will move downward along the axis of the screw 2 under the action of the rotation of the screw 2, so as to achieve the purpose of pushing the sampling disk 3 to move toward the lower end of the casing 1. When the sampling disk 3 moves downward, if the paddle 21 is not in the threaded hole 302 in the early stage, then when the sampling disk 3 approaches the paddle 21 downward, under the push of the lower edge of the threaded hole 302, the two paddles 21 will swing inward at the same time and compress the elastic member 22. When the sampling disk 3 continues to descend and the paddle 21 moves relatively to the position of the spline hole 303, the lower end of the paddle 21 will automatically swing outward and get stuck in the tooth groove of the spline hole 303, and then the sampling disk 3 will rotate with the screw 2 under the drive of the screw 2. When the sampling disk 3 rotates to the point where the countersunk holes 301 and the through holes 101 begin to intersect, the liquid outside the casing 1 will automatically fill the countersunk holes 301. The sampling disk 3 rotates one circle with the screw 2 to fill all the countersunk holes 301 outside the sampling disk 3 with liquid. During the sampling process of the sampling disk 3, the screw 2 is in a state of continuous rotation. At this time, because the lower end of the screw 2 has been separated from the threaded hole 302, the sampling disk 3 in the sampling state will stop moving downward, and only rotates with the screw 2 under the action of the paddle 21, and the upper sampling disk 3 will continue to move downward. When the upper sampling disk 3 contacts the top surface of the sampling disk 3 in the sampling state below, it will push the lower sampling disk 3 to continue to move below the casing 1. When the contacting surfaces of the two adjacent sampling disks 3 above and below are at the position of the axis of the through hole 101, the side walls of the two sampling disks 3 will block the through hole 101. At this time, the corresponding countersunk hole 301 of the sampling disk 3 below that has completed sampling will just move to the bottom of the through hole 101, so that the countersunk hole 301 can be closed by the inner wall of the casing 1 below. Because there is a sealing structure between the outer wall of the sampling disk 3 and the inner wall of the casing 1, the sample inside the countersunk hole 301 will not leak. At this time, the motor 11 can be stopped and the casing 1 can continue to be moved downward or upward in the water body until the casing 1 is moved to the next sampling height. Then continue to start the motor 11, and use the screw rod 2 to push the upper sampling disk 3 to continue to move downward. At this time, the sampling disk 3 connected to the lower end of the screw rod 2 continues to move downward to push the sampling disk 3 that has completed sampling to move downward, and make the sampling disk 3 connected to the lower end of the screw rod 2 enter the sampling state, and sample and collect the water here. The sampling process is the same as the sampling process of the previous sampling disk 3. When the sampling disk 3 completes the sampling, it will also be pushed into the lower casing 1 by the adjacent sampling disk 3 above, and the friction between the sampling disk 3 and the casing 1 is used to stably store the sampling disk 3 that has completed the sampling work at the lower end of the casing 1.

[0025] By repeating the above process, multiple sampling trays 3 can be used to sample water bodies at different depths separately, and each sampling tray 3 can take multiple samples at the same depth through the sink hole 301 to improve the accuracy of the sample.

[0026] During the sampling process, the distance that each sampling disk 3 moves along the screw rod 2 can be determined by the pitch of the screw rod 2 and the number of rotations of the motor 11, so as to determine the position of the sampling disk 3, which is used as the basis for starting or stopping the motor 11. The above data can be transmitted to the output processing end via a cable. The carrier of the data processing end is a mobile phone or a computer, and the start and stop of the motor 11 can be controlled through the carrier.

[0027] After completing the sampling, the casing 1 is lifted out of the water surface by a rope or a rod, and the sampling tray 3 is taken out from the lower end of the casing 1. Before taking out the sampling tray 3, a container can be placed under the casing 1 to receive the sample inside the sinker 301. In order to facilitate the removal of the sampling tray 3 from the bottom of the casing 1, a tool with a screw can be used. The screw and the threaded hole 302 are matched, and the sampling tray 3 can be easily pulled out of the casing 1 using the tool.

[0028] Preferably, Figure 3 , Figure 6 As shown, a position sensor 13 is pierced through the side wall of the sleeve 1, which is located above the through hole 101, and a circle of induction ring 33 is embedded above the countersunk hole 301 corresponding to the sampling disk 3. When the position sensor 13 detects the induction ring 33, the bottom surface of the sampling disk 3 coincides with the axis of the through hole 101. The signal generated when the position sensor 13 detects the induction ring 33 is used as the basis for stopping the motor 11. At this time, the contact surface between the sensed sampling disk 3 and the lower sampling disk 3 is exactly at the position of the axis of the through hole 101, and at this time, the side walls of the upper and lower sampling disks 3 just block the through hole 101; the material of the induction ring 33 is different from that of the sampling disk 3, so as to provide a signal source for the position sensor 13. Specifically, the sampling disk 3 is made of plastic material, and the induction ring 33 is made of metal such as copper or stainless steel.

[0029] Preferably, Figure 8As shown, the sealing structure between the outer wall of the sampling disk 3 and the inner wall of the casing 1 includes a sealing ring 31 disposed at the upper and lower ends of the outer wall of the sampling disk 3, and a rubber ring 32 coaxially disposed on the outer side of the outer wall of the sampling disk 3 corresponding to the countersunk hole 301. The rubber ring 32 is located between the two sealing rings 31. In the assembled state, the sealing ring 31 and the rubber ring 32 are tightly fitted with the inner wall of the casing 1, which can not only ensure the sealing between the countersunk hole 301 and the inner wall of the casing 1, but also provide friction between the sampling disk 3 and the casing 1. As another alternative, a rubber coating is provided on the outer wall of the sampling disk 3, and the rubber coating is formed by spraying or bonding, so as to ensure the sealing of the countersunk hole 301 and provide friction between the sampling disk 3 and the casing 1.

[0030] Preferably, Figures 1 to 3 and Figure 5 , Figure 6 As shown, the sleeve 1 includes an upper tube 14, a cover plate 15 detachably arranged on the top of the upper tube 14, and a lower tube 16 detachably arranged at the lower end of the upper tube 14. The through hole 101 is opened at the lower end of the upper tube 14, the motor 11 is arranged on the top surface of the cover plate 15, and the screw rod 2 is passed through the bottom of the cover plate 15. The sealed space of this structural design is located above the cover plate 15. Specifically, the upper tube 14, the cover plate 15 and the lower tube 16 are all connected by threads, and the direction of tightening the threads is consistent with the direction of rotation of the screw rod 2 during sampling to prevent the connecting threads from loosening. With the above structural design, the sampling disk 3 can be installed on the screw rod 2 first during assembly. At this time, the screw rod 2 and the sampling disk 3 are exposed to the outside of the sleeve 1, which is convenient for Adjust the position of the adjacent sampling disks 3; then insert the sampling disk 3 and the screw rod 2 from the upper end of the upper tube 14, and connect the cover 15 to the upper tube 14. This design makes it easier to install the sampling disk 3; the lower tube 16 can be connected to the upper tube 14 in advance or after the cover 15 is installed; after sampling is completed, the sampling disks 3 containing the samples are moved into the lower tube 16. After the sampler is fished out, only the lower tube 16 needs to be removed for temporary storage. If more samples are obtained, the lower tube 16 can be replaced and a new sampling disk 3 can be installed, so that the next round of sampling can be carried out quickly. There is no need to take out the samples inside the sampling disk 3 on site to avoid spilling and save outdoor operation time.

[0031] Preferably, Figure 1 , Figure 2 and Figure 4 As shown, a detachable retaining ring 4 is coaxially provided below the sleeve 1, which includes a circular tube 41 and a circular ring 42 coaxially provided at the bottom of the circular tube 41. The inner diameter of the circular tube 41 is the same as the inner diameter of the sleeve 1, and the diameter of the inner hole of the circular ring 42 is smaller than the outer diameter of the sampling disk 3. The retaining ring 4 can prevent the sampling disk 3 from falling from below the sleeve 1. After the sampling is completed, the retaining ring 4 can be removed to take out the sampling disk 3. As a preferred structure, the retaining ring 4 and the sleeve 1 are threadedly connected.

[0032] Preferably, the water quantitative sampler comprises a plurality of retaining rings 4, such as Figure 4 As shown, the depth of the inner wall of the circular tube 41 is greater than or equal to the thickness of the sampling disk 3. Before taking the sampling disk 3 out of the sleeve 1, the retaining ring 4 is connected to the sleeve 1, and then the sampling disk 3 is moved into the circular tube 41, and then the retaining ring 4 and the sampling disk 3 inside it are taken out together and temporarily stored as a separate storage unit, and then a new retaining ring 4 is replaced and connected to the sleeve 1, and another sampling disk 3 is taken out, so that samples of different depths can be stored separately.

[0033] Further preferably, Figure 4 As shown, the circular tube 41 is made of a transparent material, and a drainage hole 411 is opened on its side wall. The diameter of the drainage hole 411 is smaller than the physical distance between adjacent countersunk holes 301 on the outer side of the sampling disk 3. Before taking out the sampling disk 3 together with the retaining ring 4, the retaining ring 4 or the sampling disk 3 is rotated to stagger the drainage hole 411 and the countersunk hole 301; after the sampling disk 3 and the retaining ring 4 are taken out together, when it is necessary to pour out the sample, it is only necessary to relatively rotate the retaining ring 4 or the sampling disk 3 to align the drainage hole 411 with the countersunk hole 301, and then the sample in the countersunk hole 301 can be poured out. The above method can be used to pour out the samples inside each countersunk hole 301 one by one, so that multiple samples in the same sampling disk 3 can be collected independently.

[0034] Preferably, Figure 2 , Figure 5 As shown, the water quantitative sampler also includes a push plate 5, which is coaxially arranged in the casing 1 in the assembled state, and the screw 2 coaxially passes through the push plate 5 through a threaded structure. The friction between the outer wall of the push plate 5 and the inner wall of the casing 1 is greater than the friction between the screw 2 and the push plate 5, so that the push plate 5 can be pushed to move along the axial direction of the casing 1 by the rotation of the screw 2. The push plate 5 is spaced above the top sampling disk 3, and the thickness of the push plate 5 is greater than or equal to the radius of the through hole 101. The push plate 5 can be used to push the top sampling disk 3 into the casing 1 below the through hole 101 to ensure that the countersunk hole of the top sampling disk 3 is sealed to prevent sample loss.

[0035] Preferably, in the assembled state, the interval between adjacent sampling disks 3 is greater than one pitch of the screw rod 2 and less than half the thickness of the sampling disk 3. The purpose of setting the interval greater than one pitch is to ensure that the sampling disk 3 completes at least one rotation during the sampling process, and the sampling disk 3 above it can start to push down the sampling disk 3 being sampled. The purpose of designing the interval to be less than half the thickness of the sampling disk 3 is to shorten the time for pushing the sampling disk 3 downward after sampling is completed, and then shorten the sampling time. As a preferred interval distance, it is preferably 1.5 to 3 times the pitch of the screw rod 2.

[0036] Preferably, Figure 7As shown, the outer side of the paddle 21 is in an isosceles trapezoidal structure, so that it can be smoothly inserted into the tooth groove of the spline hole 303.

[0037] The above is only a preferred embodiment of the present invention, and is not intended to be the only one or to limit the present invention. It should be understood by those skilled in the art that various changes or equivalent substitutions made to the present invention without departing from the scope of the present invention are within the scope of protection of the present invention.

Claims

1. A water quantitative sampler, characterized in that: include: The sleeve (1) has a cylindrical hole structure inside and a through hole (101) is opened in the middle of its side wall; The screw rod (2) is coaxially arranged at the upper end of the sleeve (1); the sleeve (1) is provided with a closed space for installing a motor (11) for driving the screw rod (2) to rotate; a strip groove (201) is provided at the lower end of the screw rod (2); a pair of paddles (21) are rotatably arranged in the strip groove (201); an elastic member (22) is provided between the two paddles (21); and the lower ends of the two paddles (21) face downwardly of the screw rod (2); The sampling disk (3) is a disk structure, and a plurality of countersunk holes (301) are formed on its outer wall along the circumference, the minimum distance between the side wall of the countersunk hole (301) and the top and bottom surfaces of the sampling disk (3) is greater than the radius of the through hole (101), the sampling disk (3) is coaxially provided with a threaded hole (302), and the upper end of the threaded hole (302) is coaxially provided with a spline hole (303), and the inner diameter of the circle formed by the tooth top is greater than the minor diameter of the threaded hole (302); In an assembled state, a plurality of sampling disks (3) are coaxially inserted into the sleeve (1), adjacent sampling disks (3) are spaced apart, a sliding sealing structure is provided between the outer wall of the sampling disk (3) and the inner wall of the sleeve (1), the screw rod (2) passes through the threaded hole (302), and the spline hole (303) faces the upper end of the screw rod (2); the friction force between the outer wall of the sampling disk (3) and the inner wall of the sleeve (1) is greater than the friction force between the screw rod (2) and the threaded hole (302); when the paddle (21) is inserted into the tooth groove of the spline hole (303), the countersunk hole (301) and the through hole (101) are at the same height, and the lower end of the screw rod (2) is separated from the threaded hole (302).

2. A water quantitative sampler according to claim 1, characterized in that: A position sensor (13) is provided through the side wall of the sleeve (1) and is located above the through hole (101). A circle of induction rings (33) is embedded above the countersunk hole (301) corresponding to the sampling disk (3). When the position sensor (13) detects the induction ring (33), the bottom surface of the sampling disk (3) coincides with the axis of the through hole (101).

3. A water quantitative sampler according to claim 1, characterized in that: The sealing structure between the outer wall of the sampling disk (3) and the inner wall of the sleeve (1) comprises sealing rings (31) arranged at the upper end and the lower end of the outer wall of the sampling disk (3), and a rubber ring (32) coaxially arranged on the outer side of the corresponding countersunk hole (301) on the outer wall of the sampling disk (3). The rubber ring (32) is located between the two sealing rings (31). In the assembled state, the sealing ring (31) and the rubber ring (32) are both tightly fitted to the inner wall of the sleeve (1).

4. A water quantitative sampler according to claim 1, characterized in that: The sleeve (1) comprises an upper tube (14), a cover plate (15) detachably arranged on the top of the upper tube (14), and a lower tube (16) detachably arranged on the lower end of the upper tube (14); a through hole (101) is opened at the lower end of the upper tube (14); a motor (11) is arranged on the top surface of the cover plate (15); and a screw rod (2) is passed through the bottom of the cover plate (15).

5. A water quantitative sampler according to claim 1, characterized in that: A detachable retaining ring (4) is coaxially arranged below the sleeve (1), comprising a circular tube (41) and a circular ring (42) coaxially arranged at the bottom of the circular tube (41), the inner diameter of the circular tube (41) being the same as the inner diameter of the sleeve (1), and the diameter of the inner hole of the circular ring (42) being smaller than the outer diameter of the sampling disk (3).

6. A water quantitative sampler according to claim 5, characterized in that: There are multiple retaining rings (4), and the depth of the inner wall of the circular tube (41) is greater than or equal to the thickness of the sampling plate (3).

7. A water quantitative sampler according to claim 6, characterized in that: The circular tube (41) is made of a transparent material, and a drainage hole (411) is provided on its side wall. The diameter of the drainage hole (411) is smaller than the physical distance between adjacent countersunk holes (301) on the outside of the sampling plate (3).

8. A water quantitative sampler according to claim 1, characterized in that: It also includes a push plate (5), which is coaxially inserted into the sleeve (1) in an assembled state, and the screw rod (2) coaxially passes through the push plate (5) via a threaded structure, the friction between the outer wall of the push plate (5) and the inner wall of the sleeve (1) is greater than the friction between the screw rod (2) and the push plate (5), the push plate (5) is spaced above the sampling plate (3) at the top, and the thickness of the push plate (5) is greater than or equal to the radius of the through hole (101).

9. A water quantitative sampler according to claim 1, characterized in that: In the assembled state, the interval between adjacent sampling discs (3) is greater than a pitch of the screw rod (2) and less than half the thickness of the sampling disc (3).

10. A water quantitative sampler according to claim 1, characterized in that: The outer side of the plectrum (21) is in an isosceles trapezoidal structure.

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