A water body quantitative sampler

Abstract

A water body quantitative sampler belongs to the technical field of liquid sampling devices. The sampler includes: a sleeve with a cylindrical hole structure inside, and a through hole is opened in the middle of its side wall; a lead screw coaxially arranged at the upper end inside the sleeve, and the sleeve is provided with a closed space for installing a motor for driving the lead screw to rotate. A strip-shaped groove is opened at the lower end of the lead screw, and a pair of paddles are rotatably arranged in the strip-shaped groove. An elastic member is arranged between the two paddles, and the lower ends of the two paddles face the lower part of the lead screw; a sampling disc is of a disc structure, and a plurality of counterbores are opened along the circumference of its outer wall. As shown in Figure 3 and Figure 6, the minimum distance between the side wall of the counterbore and the top and bottom surfaces of the sampling disc is greater than the radius of the through hole. The sampling disc is coaxially provided with a threaded hole, and a spline hole is coaxially arranged at the upper end of the threaded hole, and the circular inner diameter formed by the tooth tops is greater than the minor diameter of the threaded hole. This solution can quantitatively and independently collect water body samples at different depths, effectively avoid the mutual influence between samples, and ensure the accuracy of the detection structure.

Description

Technical Field

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

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

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

[0004] To achieve the purpose of the present invention, the following scheme is proposed:

[0005] A water body quantitative sampler, comprising:

[0006] A sleeve, with a cylindrical hole structure inside, and a through hole is provided in the middle of its side wall;

[0007] A lead screw, coaxially arranged at the upper end inside the sleeve, and the sleeve is provided with a closed space for installing a motor for driving the lead screw to rotate. A strip-shaped groove is provided at the lower end of the lead screw, and a pair of paddles are rotatably arranged in the strip-shaped groove. An elastic member is arranged between the two paddles, and the lower ends of the two paddles face downward of the lead screw;

[0008] A sampling disk, which is a disk structure, and a plurality of counterbores are arranged along the circumference on its outer wall. As Figure 3 、 Figure 6 shown, the minimum distance between the side wall of the counterbore 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 a spline hole is coaxially provided at the upper end of the threaded hole, and the circular inner diameter formed by the tooth tops is greater than the minor diameter of the threaded hole;

[0009] 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.

[0010] 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

[0011] 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.

[0012] Figure 1 The external structure diagram of the preferred solution of the present application is shown.

[0013] Figure 2 A cross-sectional view of the present application is shown when the sampling disc is sampling.

[0014] Figure 3 Shows Figure 2 A partial enlarged view of point A in the middle.

[0015] Figure 4 A cross-sectional view of the connection between the retaining ring and the sleeve is shown.

[0016] Figure 5 A cross-sectional view of the present application is shown when adjacent sampling disks use side walls to block through holes.

[0017] Figure 6 Shows Figure 5 A partial enlarged view of point B in the middle.

[0018] Figure 7 A schematic diagram of the installation structure of the paddle at the bottom of the screw rod is shown.

[0019] Figure 8 A schematic diagram of the internal structure of the sampling disk when the paddle cooperates with the spline hole is shown.

[0020] Markings in the figure: casing - 1, through - hole - 101, motor - 11, capacitor - 12, sensor - 13, upper tube - 14, cover plate - 15, lower tube - 16, lead screw - 2, strip - shaped groove - 201, paddle - 21, elastic member - 22, sampling disc - 3, counterbore - 301, threaded hole - 302, spline hole - 303, sealing ring - 31, rubber ring - 32, induction ring - 33, retaining ring - 4, circular tube - 41, drain hole - 411, circular ring - 42, push plate - 5. Detailed implementation mode

[0021] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will describe the implementation modes of the present invention in detail with reference to the accompanying drawings. However, the embodiments described herein are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0022] As Figures 1 to 3 and Figures 5 to 8 shown, a water body quantitative sampler includes: a casing 1, a lead screw 2 and a plurality of sampling discs 3.

[0023] The interior of the casing 1 is a cylindrical hole structure, and a through - hole 101 is provided in the middle of its side wall.

[0024] The lead screw 2 is coaxially arranged at the upper end inside the casing 1. The casing 1 is provided with a closed space for installing a motor 11 that drives the lead screw 2 to rotate. As a preferred solution, a capacitor 12 for supplying electrical energy to the motor 11 is also provided in the closed space, or the motor 11 is directly powered by a cable. A strip - shaped groove 201 is provided at the lower end of the lead screw 2, and a pair of paddles 21 are rotatably arranged in the strip - shaped groove 201. The axis of rotation of the paddles 21 is perpendicular to the side wall of the strip - shaped 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 downward of the lead screw 2.

[0025] The sampling disc 3 is a disc structure, and a plurality of counterbores 301 are provided along the circumference of its outer wall. As Figure 3 , Figure 6 shown, the minimum distance between the side wall of the counterbore 301 and the top and bottom surfaces of the sampling disc 3 is greater than the radius of the through - hole 101. In this way, the wall thickness between two adjacent sampling discs 3 can be used to block the through - hole 101. As a preferred solution, the counterbores 301 are all round holes for easy installation. And the axis of the counterbore 301 is consistent with the radial direction of the sampling disc 3, and the counterbores 301 are arranged in a circumferential array along the sampling disc 3. The sampling disc 3 is coaxially provided with a threaded hole 302, and a spline hole 303 is coaxially provided at the upper end of the threaded hole 302. The circular inner diameter formed by the tooth tops is greater than the minor diameter of the threaded hole 302.

[0026] As Figure 2 , Figure 3As 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.

[0027] 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.

[0028] 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.

[0029] 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:

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] Preferably, Figure 8As shown in the figure, the sealing structure between the outer wall of the sampling disc 3 and the inner wall of the sleeve 1 includes sealing rings 31 provided at the upper and lower ends of the outer wall of the sampling disc 3, and a rubber ring 32 coaxially arranged outside the sampling disc 3 corresponding to the counterbore 301. The rubber ring 32 is located between the two sealing rings 31. In the combined state, both the sealing ring 31 and the rubber ring 32 are in close contact with the inner wall of the sleeve 1. This can not only ensure the sealing between the counterbore 301 and the inner wall of the sleeve 1, but also provide friction between the sampling disc 3 and the sleeve 1. As another alternative, a rubber coating is provided on the outer wall of the sampling disc 3, and the rubber coating is formed by spraying or bonding to ensure the sealing of the counterbore 301 and provide friction between the sampling disc 3 and the sleeve 1.

[0036] Preferably, as Figures 1 to 3 and Figure 5 、 Figure 6 shown, the sleeve 1 includes an upper tube 14, a cover plate 15 detachably provided at the top of the upper tube 14, and a lower tube 16 detachably provided at the lower end of the upper tube 14. A through hole 101 is opened at the lower end of the upper tube 14, and a motor 11 is provided on the top surface of the cover plate 15. The lead screw 2 passes through the lower part of the cover plate 15. The sealed space designed in this structure is located above the cover plate 15. Specifically, the upper tube 14 is threadedly connected to both the cover plate 15 and the lower tube 16, and the tightening direction of the thread is the same as the rotation direction of the lead screw 2 during sampling to prevent the connection thread from loosening. With the above structural design, during assembly, the sampling disc 3 can be first installed on the lead screw 2. At this time, both the lead screw 2 and the sampling disc 3 are exposed outside the sleeve 1, which is convenient for adjusting the position of the sampling disc 3 adjacent to each other. Then, the sampling disc 3 and the lead screw 2 are inserted from the upper end of the upper tube 14, and the cover plate 15 is connected to the upper tube 14. This design makes the installation of the sampling disc 3 more convenient. The lower tube 16 can be connected to the upper tube 14 in advance or after the cover plate 15 is installed. After sampling, the sampling disc 3 containing the sample is moved into the lower tube 16. When 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 disc 3 can be installed to quickly carry out the next round of sampling work without taking out the sample inside the sampling disc 3 on-site to avoid spilling and save outdoor operation time.

[0037] Preferably, as Figure 1 、 Figure 2 and Figure 4 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 disc 3. The retaining ring 4 is provided to prevent the sampling disc 3 from falling from below the sleeve 1. After sampling, the retaining ring 4 is removed to take out the sampling disc 3. As a preferred structure, the retaining ring 4 is threadedly connected to the sleeve 1.

[0038] Preferably, the water body quantitative sampler includes a plurality of retaining rings 4. As Figure 4 shown, the depth of the inner wall of the circular tube 41 is greater than or equal to the thickness of the sampling disc 3. Before removing the sampling disc 3 from the sleeve 1, connect the retaining ring 4 to the sleeve 1, then move the sampling disc 3 into the circular tube 41, and then take out the retaining ring 4 and the sampling disc 3 inside it together, and temporarily store them as a separate storage unit. Then replace the new retaining ring 4 and connect it to the sleeve 1, and take out another sampling disc 3. In this way, samples at different depths can be stored separately.

[0039] Further preferably, as Figure 4 shown, the circular tube 41 is made of a transparent material, and its side wall is provided with a liquid discharge hole 411. The diameter of the liquid discharge hole 411 is smaller than the solid spacing between adjacent sunken holes 301 on the outside of the sampling disc 3. Before taking out the sampling disc 3 and the retaining ring 4 together, rotate the retaining ring 4 or the sampling disc 3 to stagger the liquid discharge hole 411 and the sunken hole 301; after taking out the sampling disc 3 and the retaining ring 4 together, when it is necessary to pour out the sample, only need to rotate the retaining ring 4 or the sampling disc 3 relatively to align the liquid discharge hole 411 and the sunken hole 301, and then the sample in the sunken hole 301 can be poured out. By using the above method, the samples in each sunken hole 301 can be poured out one by one, so as to independently collect multiple samples in the same sampling disc 3.

[0040] Preferably, as Figure 2 、 Figure 5 shown, the water body quantitative sampler further includes a push plate 5. In the assembled state, it coaxially passes through the sleeve 1, and the lead screw 2 coaxially passes through the push plate 5 through a threaded structure. The frictional force between the outer side wall of the push plate 5 and the inner wall of the sleeve 1 is greater than the frictional force between the lead screw 2 and the push plate 5, so as to facilitate the use of the rotation of the lead screw 2 to push the push plate 5 to move along the axis direction of the sleeve 1. The push plate 5 is spaced above the top sampling disc 3, and the thickness of the push plate 5 is greater than or equal to the radius of the through hole 101. By using the push plate 5, the uppermost sampling disc 3 can be pushed into the sleeve 1 below the through hole 101 to ensure the sealing of the sunken holes of the uppermost sampling disc 3 and prevent sample loss.

[0041] Preferably, in the assembled state, the interval between adjacent sampling discs 3 is greater than one pitch of the lead screw 2 and less than half of the thickness of the sampling disc 3. The purpose of setting the interval greater than one pitch is to ensure that the sampling disc 3 rotates at least one full circle during the sampling process, and only then can the sampling disc 3 above it start to push the sampling disc 3 being sampled downward. The purpose of designing the interval to be less than half of the thickness of the sampling disc 3 is to shorten the time for the sampling disc 3 that has completed sampling to be pushed downward, thereby shortening the sampling time. As a preference, this interval distance is preferably 1.5 to 3 times the pitch of the lead screw 2.

[0042] Preferably, as Figure 7As shown, the outer side of the paddle 21 is in an isosceles trapezoid structure, so as to facilitate its smooth engagement into the tooth groove of the spline hole 303.

[0043] The above are only the preferred embodiments of the present invention and do not represent the only or limit the present invention. Those skilled in the art should understand that various changes or equivalent substitutions made to the present invention without departing from the scope of the present invention all fall 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; A 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). The axes of rotation of the paddles (21) are perpendicular to the side walls 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. The lower ends of the two paddles (21) are both facing downward 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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