Water quality detection method based on micro-sampling

Abstract

The invention belongs to the technical field of water quality detection, and discloses a water quality detection method based on microsampling, which comprises the following steps: S1, arranging a sampling assembly at a first position, and enabling the sampling assembly to directly face a sampling port on a water storage tank; s2, controlling the sampling assembly to move to a second position and sealing the sampling port for sampling; s3, controlling the sampling assembly to move to a first position; s4, controlling the sampling assembly to move to a third position to directly face the water quality detection module; s5, controlling the sampling assembly to move to a fourth position and dropping liquid for detection; and S6, controlling the sampling assembly to return to the first position. Obstacle avoiding, sampling and liquid dropping are achieved by controlling the sampling assembly at the corresponding position, the control mode is simple, the moving distance is simple, the sampling assembly can rapidly achieve sampling and liquid dropping actions, and then the water quality detection efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of water quality detection, and in particular to a water quality detection method based on microsampling. Background Art

[0002] With the development of society and the progress of science, the demand and requirements for water quality testing are constantly increasing. Factors affecting water quality testing include water quality testing efficiency and water quality testing accuracy. The water quality testing process generally requires sampling first and testing the sampled liquid. Therefore, the efficiency and accuracy of sampling directly affect the efficiency and accuracy of water quality testing.

[0003] Sampling for water quality testing includes water source sampling and micro sampling. Since micro sampling is generally small in size, the accuracy and efficiency of micro sampling are required to be high. In the prior art, when the water source is first injected into the water tank and then micro sampling is performed, the efficiency and accuracy of micro sampling are low due to liquid surface disturbance or droplet splashing, which affects the efficiency of water quality testing; and manual micro sampling has high labor costs and high work intensity. Summary of the invention

[0004] The purpose of the present invention is to provide a water quality detection method based on microsampling, which is used to solve the problems of low efficiency and low sampling accuracy of microsampling during water quality detection.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The water quality detection method based on microsampling includes the following steps:

[0007] S1, placing the sampling assembly at a first position so that the sampling assembly faces the sampling port on the water tank;

[0008] S2, controlling the sampling assembly to move to a second position and sealing the sampling port for sampling;

[0009] S3, controlling the sampling assembly to move to the first position;

[0010] S4, controlling the sampling assembly to move to a third position to face the water quality detection module;

[0011] S5, controlling the sampling assembly to move to a fourth position and dripping liquid for detection;

[0012] S6, controlling the sampling assembly to return to the first position.

[0013] In some embodiments, step S2 and step S3 are executed in a loop at least twice before proceeding to step S4.

[0014] In some embodiments, in step S2, after the sampling assembly seals the sampling port, the water tank starts to fill with water, and the filling is stopped after the water reaches the designed water level, and the sampling assembly performs sampling.

[0015] In some embodiments, after the water in the water tank reaches the designed water level, the sampling assembly stays at the second position for a set time to perform sampling.

[0016] In some embodiments, in step S6, the sampling component first moves from the fourth position to the third position, and then moves from the third position to the first position.

[0017] In some embodiments, the water quality detection method based on microsampling further includes step S7, controlling the sampling component to move from the first position to the second position, and injecting water into the water tank to flush the sampling component.

[0018] In some embodiments, when flushing the sampling component, the water tank is continuously filled with water to continuously flush the sampling component.

[0019] In some embodiments, when flushing the sampling assembly, the sampling assembly reciprocates between the first position and the second position multiple times.

[0020] In some embodiments, the moving speed of the sampling component is no higher than 1 cm / s.

[0021] In some embodiments, the sampling component is arranged at the output end of the vertical driving mechanism, and the vertical driving mechanism is arranged at the output end of the horizontal driving mechanism. The output end of the vertical driving mechanism can drive the sampling component to reciprocate between the first position and the second position and between the third position and the fourth position; the output end of the horizontal driving mechanism can drive the sampling component to reciprocate between the first position and the third position.

[0022] In some embodiments, the first position, the second position, the third position and the fourth position are respectively provided with in-place detection members for detecting in-place signals of the sampling assembly.

[0023] In some embodiments, the in-place detection component is a camera, a camera, or an in-place switch.

[0024] In some embodiments, the water storage tank includes a box body, which is provided with a water inlet, a water outlet, a sampling port and a drain; a first water baffle and a second water baffle are provided in the box body, and along the length direction of the box body, the first water baffle and the second water baffle divide the internal space of the box body into three cavities connected in sequence, and the water inlet, the sampling port and the water outlet are respectively connected to the three cavities in sequence, and the drain is arranged on the bottom wall of the box body between the first water baffle and the second water baffle.

[0025] In some embodiments, the vertical drive mechanism and the horizontal drive mechanism are both linear drive mechanisms.

[0026] Beneficial effects of the present invention:

[0027] The water quality detection method based on microsampling provided by the present invention controls the movement of the sampling component in the first position, the second position, the third position and the fourth position, so that the sampling component can achieve obstacle avoidance, sampling and dripping at the corresponding positions. The control method of the sampling component is simple and the moving distance is simple, which is conducive to the sampling component to quickly achieve sampling and dripping actions, thereby helping to improve the efficiency of water quality detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a flow chart of a water quality detection method based on microsampling provided by an embodiment of the present invention;

[0029] Figure 2 is a schematic diagram of a water quality detection method based on microsampling provided by an embodiment of the present invention;

[0030] Figure 3 is a schematic structural diagram of a water storage tank involved in a water quality detection method based on microsampling provided in an embodiment of the present invention;

[0031] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure of the middle water storage tank;

[0032] Figure 5 It is a structural schematic diagram of a sampling component involved in a water quality detection method based on microsampling provided in an embodiment of the present invention.

[0033] In the figure:

[0034] 1. Box body; 11. Sampling port; 12. Water inlet; 13. Water outlet; 14. First water baffle; 15. Second water baffle; 16. Drainage port;

[0035] 2. Sampling assembly; 21. Sampling rod; 22. Structural member; 221. Sealing part; 23. Base. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0037] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0040] The present invention provides a method for detecting water quality based on microsampling. Figure 1 The flowchart shown includes the following steps:

[0041] S1, set the sampling assembly 2 at a first position so that the sampling assembly 2 faces the sampling port 11 on the water tank;

[0042] S2, controlling the sampling assembly 2 to move to the second position and sealing the sampling port 11 for sampling;

[0043] S3, controlling the sampling assembly 2 to move to the first position;

[0044] S4, controlling the sampling assembly 2 to move to a third position to face the water quality detection module;

[0045] S5, controlling the sampling assembly 2 to move down to the fourth position and drip liquid for detection;

[0046] S6, controlling the sampling assembly 2 to return to the first position.

[0047] It should be noted that, in this embodiment, the sampling assembly 2 is used to sample a small amount of water in the water tank, and the specific structure includes but is not limited to the sampling rod 21 having a concave arc sampling head, which is not limited in the present invention. When the sampling assembly 2 seals the sampling port 11, the sampling assembly 2 has a structure that is compatible with the sampling port 11, so that the sampling rod 21 can be inserted into the water tank and can also seal the sampling port 11.

[0048] The water quality detection method based on microsampling provided by the present invention is as follows: Figure 2 As shown, Figure 2 The middle dotted line shows the reset process of the sampling component 2 from the fourth position to the first position. Assuming the vertical direction is the Y-axis direction and the horizontal direction is the X-axis direction, in the XY plane, the second position is the center position of the sampling port 11 above the water tank, and the first position is the upper position directly opposite the sampling port 11. The sampling component 2 can be moved between the first position and the second position by lifting and lowering along the Y-axis direction. The third position has the same height as the first position and is both set along the X-axis direction. The third position is directly above the water quality detection module. The sampling component 2 can be lifted and lowered along the Y-axis direction between the third position and the fourth position to transfer the sampled liquid droplets to the water quality detection module. Among them, the water quality detection module and the water tank are set in the same direction, that is, the second position and the fourth position are spaced apart along the X-axis direction. The sampling component 2 reciprocates between the first position, the second position, the third position and the fourth position to realize the sampling and dripping process; the control method of the sampling component 2 is simple and the moving distance is simple, and the position accuracy is high, which is conducive to the sampling component 2 to quickly realize the sampling and dripping action, thereby improving the efficiency of water quality detection. It should be noted that when executing the water quality detection method based on microsampling, the sampling component 2 only involves movement along the X-axis in the horizontal direction, and no movement control is performed after initial positioning in the horizontal direction perpendicular to the X-axis.

[0049] In some embodiments, step S2 and step S3 are executed in a loop at least twice before proceeding to step S4.

[0050] After the sampling is repeated in steps S2 and S3, the influence of bubbles in the water on the sampling amount can be avoided. The sampling component 2 performs multiple reciprocating motions in the water tank to sample, which is conducive to eliminating bubbles. Specifically, the sampling component 2 descends to sample and then rises to leave the liquid surface to the first position, then descends to the second position to sample and then rises to leave the liquid surface to the first position, and repeats this process to ensure sampling accuracy.

[0051] In some embodiments, in step S2, after the sampling component 2 seals the sampling port 11, the water tank starts to be filled with water (the water to be tested is injected), and the water injection is stopped after the water reaches the designed water level, and the sampling component 2 performs sampling.

[0052] like Figure 3 and Figure 4 The structure of a water storage tank is shown, the water storage tank comprises a tank body 1, the tank body 1 is provided with a sampling port 11, a water inlet 12, a water outlet 13 and a drain 16; a first water baffle 14 and a second water baffle 15 are provided inside the tank body 1, along the length direction of the tank body 1, the first water baffle 14 and the second water baffle 15 divide the internal space of the tank body 1 into three cavities connected in sequence, the water inlet 12, the sampling port 11 and the water outlet 13 are connected in sequence to the three cavities, and the drain 16 is provided on the bottom wall of the tank body 1 between the first water baffle 14 and the second water baffle 15. Figure 5 As shown, the sampling assembly 2 includes a sampling rod 21, a structural member 22 and a base 23. The sampling rod 21 is connected to the structural member 22, and the structural member 22 is connected to the base 23. The base 23 is used to connect the driving mechanism, thereby realizing the automatic control and driving of the sampling assembly 2. Among them, the structural member 22 is provided with a sealing portion 221 that is compatible with the structure of the sampling port 11. In this embodiment, the sealing portion 221 and the sampling port 11 are both circular structures, which are easy to position and seal. When the sampling assembly 2 descends to the second position, the sampling rod 21 penetrates into the box body 1, and the sealing portion 221 is inserted into the sampling port 11 and seals the sampling port 11 to prevent liquid (water to be tested) from splashing. When sampling, first lower the sampling assembly 2 to the second position to seal the sampling port 11, then open the water inlet 12, and inject the water to be tested into the box body 1. After the water to be tested flows downward to the bottom of the box body 1 under the action of the first water baffle 14, it is in the cavity between the first water baffle 14 and the second water baffle 15. The liquid level gradually rises to the height of the second water baffle 15, and the water injection reaches the designed water level, the water injection is stopped, and the water inlet 12 is closed. The sampling head of the sampling rod 21 of the sampling assembly 2 is completely immersed in the liquid for sampling; then the sampling assembly 2 rises and falls several times to complete a complete sampling process. In the above sampling process, the water in the box body 1 will not splash out from the sampling port 11, so it is conducive to the cleaning of the sampling environment and ensures the accuracy of the sampled droplets; during the water injection process, the first water baffle 14 and the second water baffle 15 are set, which further stabilizes the flow rate of the liquid, facilitates the rapid stabilization of the liquid level to achieve sampling, and ensures the accuracy of the sampling amount.

[0053] In some embodiments, after the water in the water tank reaches the designed water level, the sampling component 2 stays at the second position for a set time to perform sampling. It is understandable that bubbles may be generated in the water tank during the water filling process, and the sampling component 2 is a micro-sampling sampling rod 21, so a small amount of bubbles will also have a greater impact on the sampling amount. In the embodiments of the present invention, by staying for a set time after water filling to perform sampling, it is helpful to eliminate or reduce the impact of bubbles on the sampling amount and improve the sampling accuracy. The set time is generally not more than 30s. In this embodiment, the sampling component 2 stays for 5s after the water filling stops to complete the sampling, realizing bubble-free sampling.

[0054] In step S6, the sampling assembly 2 first moves from the fourth position to the third position, and then moves from the third position to the first position. Figure 2 As shown, step S6 executes the reverse process of step S4-step S5 to realize the process of resetting to the first position, that is, the sampling component 2 first rises from the fourth position to the third position along the vertical direction, and then moves from the third position to the first position along the horizontal direction, so that the sampling component 2 accurately returns to the first position, avoiding multiple position calibrations, and facilitating the rapid execution of the next sampling action.

[0055] In some embodiments, the water quality detection method based on micro-sampling further includes step S7 , controlling the sampling component 2 to move from the first position to the second position, and injecting water into the water tank to flush the sampling component 2 .

[0056] After a sampling, dripping and detection process is completed, the sampling component 2 is reset to the first position, and then the sampling component 2 cleaning step S7 is started, the sampling component 2 is lowered to the second position, and water is injected into the water tank. When the liquid level between the first water baffle 14 and the second water baffle 15 reaches the height of the second water baffle 15, water is continuously injected, and the liquid continuously flows out through the top of the second water baffle 15. The flowing liquid continuously flushes the sampling rod 21, and the sampling rod 21 is cleaned. The cleaning time is generally within 10 minutes. After the cleaning is completed, the water inlet 12 is closed, the drain port 16 is opened, and all the liquid in the box body 1 is emptied.

[0057] In some embodiments, when the flowing liquid continuously flushes the sampling rod 21, the sampling assembly 2 reciprocates between the first position and the second position, so that the sampling assembly 2 flushes reciprocally in the vertical direction, further improving the flushing effect and improving the flushing efficiency.

[0058] In some embodiments, the moving speed of the sampling component 2 is no higher than 1 cm / s.

[0059] In this embodiment, the sampling component 2 is arranged at the output end of the vertical driving mechanism, and the vertical driving mechanism is arranged at the output end of the horizontal driving mechanism. The output end of the vertical driving mechanism can drive the sampling component 2 to reciprocate between the first position and the second position and between the third position and the fourth position; the output end of the horizontal driving mechanism can drive the sampling component 2 to reciprocate between the first position and the third position.

[0060] Among them, both the vertical driving mechanism and the horizontal driving mechanism are motors. The moving speed is controlled by the motor to be 1 cm / s in the vertical direction and the horizontal direction. It is easy to control the moving position of the sampling rod 21, thereby improving the sampling efficiency and the sampling stability, and ensuring the accuracy of the sampling amount.

[0061] In some embodiments, the first position, the second position, the third position and the fourth position are respectively provided with in-place detection members for detecting the in-place signal of the sampling component 2. Each time the sampling component 2 moves to the specified position, the in-place detection member is triggered to prompt the movement to the in-place position. Of course, the in-place control of the sampling component 2 can also be achieved by controlling the stroke of the motor, and the two are monitored synchronously to ensure accuracy.

[0062] In some embodiments, the in-place detection member is any one of a camera, a camera or an in-place switch. The in-place switch can be a mechanical switch or an electronic switch. The camera and the camera need to be equipped with image processing modules for judgment. The in-place switch can directly or emit a prompt sound, which is simpler and easier to implement.

[0063] In some embodiments, both the vertical drive mechanism and the horizontal drive mechanism are linear drive mechanisms, such as linear motors, which have the advantages of direct drive and high-precision drive, and can accurately control the speed, which is more suitable for the needs of the sampling component 2.

[0064] The water quality detection method based on micro-sampling provided by the embodiment of the present invention can reduce the number of positioning sensors by controlling the position of the sampling component 2, effectively eliminate the errors caused by the installation, production and use process, and perform real-time calibration; in the drop detection step, the resetting of the sampling component 2 and the sample detection are carried out simultaneously, shortening the detection time; in the control method of the sampling component 2, the software timer count is used to control the step distance, increase the accuracy of the motor step distance, and reduce the hardware cost of the in-place switch. Compared with the three-axis control method in the prior art, the present invention uses a two-axis control method to control the movement of the sampling component 2 in the XY plane, reducing the control difficulty and cost.

[0065] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A water quality detection method based on microsampling, characterized in that: The steps include: S1, placing the sampling assembly (2) in a first position so that the sampling assembly (2) faces the sampling port (11) on the water storage tank; S2, controlling the sampling assembly (2) to move to a second position and sealing the sampling port (11) to perform sampling; S3, controlling the sampling component (2) to move to the first position; S4, controlling the sampling assembly (2) to move to a third position so as to face the water quality detection module; S5, controlling the sampling component (2) to move to a fourth position and dripping liquid for detection; S6, controlling the sampling assembly (2) to return to the first position.

2. The water quality detection method based on microsampling according to claim 1, characterized in that: Step S2 and step S3 are executed in a loop at least twice before proceeding to step S4.

3. The water quality detection method based on microsampling according to claim 1, characterized in that: In step S2, after the sampling component (2) seals the sampling port (11), the water tank starts to be filled with water, and the filling is stopped after the water reaches the designed water level, and the sampling component (2) performs sampling.

4. The water quality detection method based on microsampling according to claim 3 is characterized in that: After the water in the water storage tank reaches the designed water level, the sampling component (2) stays at the second position for a set time to perform sampling.

5. The water quality detection method based on microsampling according to claim 1, characterized in that: In step S6, the sampling component (2) first moves from the fourth position to the third position, and then moves from the third position to the first position.

6. The water quality detection method based on microsampling according to claim 1 is characterized in that: The method further comprises step S7, controlling the sampling assembly (2) to move from the first position to the second position, and injecting water into the water storage tank to flush the sampling assembly (2).

7. The water quality detection method based on microsampling according to claim 6 is characterized in that: When flushing the sampling component (2), water is continuously injected into the water storage tank to continuously flush the sampling component (2).

8. The water quality detection method based on microsampling according to claim 7 is characterized in that: When flushing the sampling component (2), the sampling component (2) reciprocates between the first position and the second position for multiple times.

9. The water quality detection method based on microsampling according to claim 1, characterized in that: The moving speed of the sampling component (2) is no higher than 1 cm / s.

10. The water quality detection method based on microsampling according to claim 1, characterized in that: The sampling component (2) is arranged at the output end of the vertical driving mechanism, and the vertical driving mechanism is arranged at the output end of the horizontal driving mechanism. The output end of the vertical driving mechanism can drive the sampling component (2) to reciprocate between the first position and the second position and between the third position and the fourth position; the output end of the horizontal driving mechanism can drive the sampling component (2) to reciprocate between the first position and the third position.

11. The water quality detection method based on microsampling according to claim 1, characterized in that: The first position, the second position, the third position and the fourth position are respectively provided with in-place detection components for detecting an in-place signal of the sampling component (2).

12. The water quality detection method based on microsampling according to claim 11, characterized in that: The in-place detection component is any one of a camera, a camera or an in-place switch.

13. The water quality detection method based on microsampling according to claim 1, characterized in that: The water storage tank comprises a box body (1), and the box body (1) is provided with a water inlet (12), a water outlet (13), the sampling port (11) and a water outlet (16); a first water baffle (14) and a second water baffle (15) are provided inside the box body (1), and along the length direction of the box body (1), the first water baffle (14) and the second water baffle (15) divide the internal space of the box body (1) into three cavities connected in sequence, and the water inlet (12), the sampling port (11) and the water outlet (13) are respectively connected in sequence to the three cavities, and the water outlet (16) is arranged on the bottom wall of the box body (1) between the first water baffle (14) and the second water baffle (15).

14. The water quality detection method based on microsampling according to claim 10, characterized in that: The vertical driving mechanism and the horizontal driving mechanism are both linear driving mechanisms.

Images