Automatic calibration device and method for water quality on-line monitoring sensor

Abstract

The invention discloses an automatic calibration device and method for a water quality on-line monitoring sensor, and relates to the technical field of water quality sensor calibration, the automatic calibration device comprises a measuring part and a calibration solution preparation part, the measuring part comprises a first cylinder, and the water quality monitoring sensor is installed in the first cylinder; the calibration solution preparation part comprises a second cylinder body, and a feeding hole is formed in the top of the second cylinder body; a liquid containing cavity is formed in the second cylinder body; a first rotating shaft is vertically arranged in the liquid containing cavity; a rotary cutting knife is mounted on the first rotating shaft; a first driving mechanism is arranged below the liquid containing cavity; one end of the infusion tube is communicated with the side wall of the second barrel, and the other end is communicated with the side wall of the first barrel; the infusion pipe is connected with a pure water pipe through a control device. According to the device, the solid reagents can be prepared into standard solutions at any time, each solid reagent is protected and packaged, the solid reagents are long in shelf life, and the prepared standard solutions are prepared at present, so that the problems of deterioration, failure and the like of the standard solutions in long-term storage are effectively avoided, and the calibration reliability is ensured.

Description

Technical Field

[0001] This invention belongs to the field of water quality sensor calibration technology, and specifically relates to an automatic calibration device and method for online water quality monitoring sensors. Background Technology

[0002] Existing water quality monitoring systems typically consist of online water quality analyzers and online water quality sensors. Online water quality analyzers usually have built-in automatic calibration programs and standard solutions, allowing for periodic or triggered calibration using standard solutions. Currently, water quality sensors are generally calibrated manually, which requires highly skilled technicians and involves a significant workload.

[0003] For example, Chinese patent CN109459553A discloses a method and system for recycling calibration solutions for water quality monitoring sensors; Chinese patent CN111596022A discloses a remote quality control method and system for water quality probe-type sensors; and Chinese patent CN221199651U discloses an automatic maintenance device for multi-parameter water quality sensors. All of these patents calibrate sensors using automated methods. These technical solutions typically employ the storage of liquid standard solutions, using valves, pumps, and other devices to pump the standard solution from the storage tank into the calibration tank for calibration. However, online water quality monitoring sensors consume a large amount of test solution per calibration, and the standard solutions for water quality monitoring sensors usually have a short shelf life and cannot be stored stably for long periods, affecting calibration accuracy. Therefore, these technical solutions are difficult to implement for long-term, stable automatic calibration. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic calibration device and method for online water quality monitoring sensors, which can avoid problems such as deterioration and failure of standard solutions during long-term storage, and ensure the reliability of calibration.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] An automatic calibration device for an online water quality monitoring sensor includes a measuring component and a calibration solution preparation component.

[0007] The measuring component includes a first cylinder, inside which a water quality monitoring sensor is installed;

[0008] The calibration solution preparation component includes a second cylinder with a feed inlet at the top; a liquid-containing chamber is provided inside the second cylinder; a first rotating shaft is vertically arranged inside the liquid-containing chamber; a rotating blade is mounted on the first rotating shaft; a first driving mechanism is provided below the liquid-containing chamber; the first driving mechanism drives the first rotating shaft to rotate.

[0009] One end of the infusion tube is connected to the side wall of the second cylinder and is located at the bottom of the liquid-containing chamber, while the other end is connected to the side wall of the first cylinder; the infusion tube is connected to a pure water tube through a control device.

[0010] Preferably, the control device includes a first power pump, a first three-way valve, and a controller. The infusion tubing includes a first branch pipe, a second branch pipe, and a third branch pipe. One end of the first branch pipe is connected to the side wall of the first cylinder, and the other end is connected to the second port of the first three-way valve. One end of the second branch pipe is connected to the third port of the first three-way valve, and the other end is connected to the first port of the first power pump. One end of the third branch pipe is connected to the second port of the first power pump, and the other end is connected to the side wall of the first cylinder. One end of the pure water pipe is connected to the first port of the first three-way valve. The controller is electrically connected to the first power pump and the first three-way valve.

[0011] Preferably, a first liquid level sensor is provided inside the first cylinder; the height of the first liquid level sensor is lower than the height of the infusion tube; a second liquid level sensor is provided above the rotating cutter inside the second cylinder.

[0012] Preferably, a first overflow port is provided above the side wall of the second cylinder.

[0013] Preferably, the system further includes a sample injection component, which includes a fixed base and a driving base. The driving base is positioned above the fixed base and has multiple first through holes evenly distributed around its circumference. Each first through hole contains a solid reagent, which is packaged in a moisture-proof packaging film. The fixed base has a second through hole corresponding to the first through hole. The second through hole is located above and corresponds to the inlet. The driving base is connected to a second driving mechanism, which drives the driving base to rotate.

[0014] Preferably, the second drive mechanism includes a second motor, which is disposed below the fixed base, and the output shaft of the second motor is connected to a second rotating shaft; the second rotating shaft passes through the fixed base and is connected to the drive base.

[0015] Preferably, a guide member is fixed to the bottom of the fixed base; a third through hole is provided in the guide member, and the third through hole corresponds to the second through hole; the bottom of the guide member extends to the top of the feed inlet.

[0016] Preferably, the bottom of the first cylinder is connected to a first liquid outlet pipe, and a valve is installed on the first liquid outlet pipe; a second overflow port is opened on the side wall of the first cylinder; the height of the second overflow port is higher than that of the first liquid level sensor; the second overflow port is connected to an overflow pipe; the end of the overflow pipe away from the second overflow port extends downward; the end of the first liquid outlet pipe away from the first cylinder and the bottom end of the overflow pipe are connected to the second liquid outlet pipe; the second liquid outlet pipe is connected to a second three-way valve.

[0017] In another aspect, the present invention provides an automatic calibration method for an online water quality monitoring sensor, which uses the aforementioned automatic calibration device for an online water quality monitoring sensor for calibration, and includes the following steps:

[0018] S1. Place the solid reagent into the second cylinder through the feed port, start the first motor, drive the rotating cutter to rotate, and cut open the moisture-proof packaging film of the solid reagent.

[0019] S2. Switch the first three-way valve to connect the first and third ports, start the first power pump, and pump the pure water in the pure water pipe into the second cylinder. When the liquid level reaches the height of the second liquid level sensor, stop pumping the pure water.

[0020] S3. Start the first motor to drive the rotary cutter to rotate, stir the liquid in the second cylinder, and stop after a certain period of time. Let the liquid in the second cylinder stand still for a certain period of time to complete the preparation of the standard solution.

[0021] S4. Switch the first three-way valve to connect the second and third ports, rotate the first power pump in reverse to pump the prepared standard solution into the first cylinder, rinse the first cylinder and then drain it.

[0022] S5. Pump the standard solution back into the first cylinder. Stop pumping when the liquid level reaches the position of the first liquid level sensor. The water quality monitoring sensor will then begin calibration.

[0023] Preferably, the method further includes the following steps:

[0024] S6. Switch the first three-way valve to connect the first and third ports, start the first power pump, pump the pure water in the pure water pipe into the second cylinder, and stop when a certain volume of pure water overflows from the first overflow port after the pure water is in excess, and discharge the packaging film of the solid reagent from the first overflow port.

[0025] S7. Switch the first three-way valve to connect the second and third ports, rotate the first power pump in reverse to pump the pure water in the second cylinder into the first cylinder, and then open the valve to discharge the liquid in the first cylinder.

[0026] This invention enables the preparation of standard solutions from solid reagents on-site using the aforementioned device. Each solid reagent is individually protected and packaged. During water quality monitoring sensor calibration, the solid reagent is automatically introduced into the second cylinder via the sample introduction component. After adding pure water to make up the volume, the calibration solution preparation is complete. Because solid reagents have a long shelf life, the prepared standard solutions are made fresh immediately upon use, effectively avoiding problems such as deterioration and failure that can occur during long-term storage, thus ensuring the reliability of the calibration.

[0027] This invention, by setting a rotating blade, can, on the one hand, cut open the moisture-proof packaging film of solid reagents, and on the other hand, when pure water is introduced into the second cylinder, rotating the rotating blade can stir the liquid and prepare a calibration solution.

[0028] The automatic calibration device for water quality sensors designed in this invention can be triggered periodically to provide calibration for water quality monitoring sensors and improve their measurement accuracy. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the fixed seat structure;

[0031] Figure 3 This is a schematic diagram of the drive seat structure. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0033] like Figure 1 As shown, the present invention provides an automatic calibration device for an online water quality monitoring sensor, comprising a measuring component and a calibration solution preparation component.

[0034] The measuring component includes a first cylinder 103, inside which a water quality monitoring sensor 101 is installed. The water quality monitoring sensor 101 is calibrated by detecting a calibration solution.

[0035] The calibration solution preparation component includes a second cylinder 203 with an inlet 205 at its top, through which solid reagent 304 is placed. The second cylinder 203 contains a liquid-containing chamber. A first rotating shaft is vertically positioned within the liquid-containing chamber. A rotating blade 202 is mounted on the first rotating shaft. A first driving mechanism is located below the liquid-containing chamber. The first driving mechanism drives the first rotating shaft to rotate, causing the rotating blade 202 to rotate. Rotating the rotating blade 202 allows for the cutting of the moisture-proof packaging film of the solid reagent 304. Furthermore, when pure water is introduced into the second cylinder 203, rotating the rotating blade 202 can stir the liquid, thus preparing the calibration solution. The first driving mechanism includes a first motor 201. One installation method involves a partition inside the second cylinder 203, with a liquid-containing chamber above the partition. The first motor 201 is fixed inside the first cylinder 103 below the partition. The conveying shaft of the first motor 201 is connected to the first rotating shaft, and the top of the first rotating shaft passes upward through the partition and connects to the rotating cutter 202. Another installation method involves fixing the first motor 201 to the bottom of the second cylinder 203, with the top of the first rotating shaft passing upward through the bottom of the second cylinder 203 and connecting to the rotating cutter 202. The first motor 201 and the rotating cutter 202 are connected by a sealing shaft to prevent liquid leakage inside the second cylinder 203. When the solid reagent 304 falls into the second cylinder 203, the first motor 201 is started, and the rotating cutter 202 rotates to cut open the moisture-proof packaging film of the solid reagent 304.

[0036] One end of the infusion tube 206 is connected to the side wall of the second cylinder 203 and is located at the bottom of the liquid-containing cavity. The other end is connected to the side wall of the first cylinder 103. The calibration solution in the second cylinder 203 is introduced into the first cylinder 103 through the infusion tube 206. By placing one end of the infusion tube 206 at the bottom of the liquid-containing cavity, it is convenient to drain the liquid in the second cylinder 203. The infusion tube 206 is connected to a pure water tube 209 through a control device. The pure water tube 209 is connected to an external pure water tank and pure water is supplied to the pure water tube 209. The control device controls the pure water tube 209 to introduce pure water into the second cylinder 203 through the infusion tube 206. The solid reagent 304 dissolves in the pure water to form a calibration solution. Then, the control device controls the calibration solution in the second cylinder 203 to be introduced into the first cylinder 103 through the infusion tube 206 for calibration. By preparing the calibration solution at any time during each calibration, the problem of short shelf life of the standard solution is avoided.

[0037] In this embodiment, the control device includes a first power pump 207, a first three-way valve 208, and a controller. The infusion tube 206 includes a first branch tube 2061, a second branch tube 2062, and a third branch tube 2063. One end of the first branch tube 2061 is connected to the side wall of the first cylinder 103, and the other end is connected to the second interface of the first three-way valve 208. One end of the second branch tube 2062 is connected to the third interface of the first three-way valve 208, and the other end is connected to the first interface of the first power pump 207. One end of the third branch tube 2063 is connected to the second interface of the first power pump 207, and the other end is connected to the first interface of the first power pump 207. A cylindrical body 103 is connected to the side wall; one end of the pure water pipe 209 is connected to the first interface of the first three-way valve 208; the controller is electrically connected to the first power pump 207 and the first three-way valve 208. During calibration, the controller controls the first three-way valve 208 to switch to the connection between the first interface and the third interface, the first power pump 207 rotates, and pumps the pure water in the pure water pipe 209 into the second cylindrical body 203 to complete the preparation of the standard solution. Then, the first three-way valve 208 is switched to the connection between the second interface and the third interface, the first power pump 207 rotates in the opposite direction, and pumps the standard solution into the first cylindrical body 103 to complete the calibration of the water quality monitoring sensor 101.

[0038] In this embodiment, a first liquid level sensor 102 is provided inside the first cylinder 103. The height of the first liquid level sensor 102 is lower than the height of the infusion pipe 206. The liquid level of the first cylinder 103 is detected by the first liquid level sensor 102. When the first power pump 207 pumps the standard solution into the first cylinder 103, when the liquid level reaches the height of the first liquid level sensor 102, the first liquid level sensor 102 sends a signal to the controller. The controller controls the first power pump 207 to stop pumping the standard solution. The volume of the standard solution is conveniently controlled when the water quality monitoring sensor 101 is calibrated by the first liquid level sensor 102.

[0039] In this embodiment, a first overflow port 210 is provided above the side wall of the second cylinder 203. When the standard is completed, the controller controls the first three-way valve 208 to switch to the connection between the first interface and the third interface. The first power pump 207 rotates to pump pure water from the pure water pipe 209 into the second cylinder 203. After the pure water is in excess, it overflows from the first overflow port 210 to a certain volume and then stops. By setting the first overflow port 210, it is convenient to discharge the packaging film of the solid reagent 304 from the first overflow port 210 to the outside of the second cylinder 203.

[0040] In this embodiment, as Figures 1-3As shown, it also includes a sample injection component, which includes a fixed base 302 and a drive base 303. The drive base 303 is positioned above the fixed base 302, and has a plurality of first through holes 3031 evenly distributed around its circumference. Each first through hole 3031 can contain a solid reagent 304, which is placed on the fixed base 302. The solid reagent 304 is packaged with a moisture-proof film to prevent it from deteriorating or becoming ineffective during long-term storage. The fixed base 302 has a second through hole 3021 corresponding to any one of the first through holes 3031. When any one of the first through holes 3031 rotates to be above the second through hole 3021, the solid reagent 304 in the first through hole 3031 falls into the second through hole 3021. The diameter of the second through hole 3021 can be larger than that of the first through hole 3031, facilitating the falling of the solid reagent 304 from the first through hole 3031 into the second through hole 3021. The second through hole 3021 is above and corresponds to the inlet 205. By rotating the drive seat 303, the fixed seat 302 remains stationary. The drive seat 303 pushes the solid reagent 304 in the first through hole 3031 to rotate around the center of the drive seat 303. When any solid reagent 304 in the first through hole 3031 rotates to the top of the second through hole 3021, the solid reagent 304 falls from the second through hole 3021 into the inlet 205, completing the automatic sample injection. The drive seat 303 is connected to a first drive mechanism, which drives the drive seat 303 to rotate.

[0041] In this embodiment, the second driving mechanism includes a second motor 301, which is disposed below the fixed base 302, and the output shaft of the second motor 301 is connected to a second rotating shaft. The second rotating shaft passes through the fixed base 302 and is connected to the driving base 303. The second motor 301 can be installed in the support frame, the fixed base 302 is fixedly connected to the support frame, and the second rotating shaft is not fixed to the fixed base 302. The second motor 301 drives the second rotating shaft to rotate, thereby causing the driving base 303 to rotate.

[0042] In this embodiment, a guide member 305 is fixed to the bottom of the fixed base 302; a third through hole is opened in the guide member 305, and the third through hole corresponds to the second through hole 3021; ​​the bottom of the guide member 305 extends to the top of the feed inlet 205, and the solid reagent 304 falls into the second through hole 3021, and then falls into the third through hole. Guided by the guide member 305, it enters the feed inlet 205, thus preventing the solid reagent 304 from falling outside the feed inlet 205.

[0043] In this embodiment, a second liquid level sensor 204 is provided above the rotating cutting blade 202 inside the second cylinder 203. The second liquid level sensor 204 detects the liquid level in the second cylinder 203. When the first power pump 207 pumps pure water into the second cylinder 203, when the liquid level reaches the height of the second liquid level sensor 204, the second liquid level sensor 204 sends a signal to the controller. The controller controls the first power pump 207 to stop pumping pure water and switches the first three-way valve 208 to connect the second and third interfaces. The volume of the prepared standard solution can be easily controlled through the second liquid level sensor 204. Since there is still pure water in the second branch pipe 2062 and the third branch pipe 2063 after the pumping of pure water stops, pure water is still present in the second branch pipe 2062 and the third branch pipe 2063. Water is pumped into the second cylinder 203 by starting the first power pump 207 and stopping it after a certain delay. This allows the pure water in the second branch pipe 2062 and the third branch pipe 2063 to be pumped into the second cylinder 203 to prepare a standard solution. Therefore, the height of the second liquid level sensor 204 is such that the quantitative volume of the solution in the second cylinder 203 plus the liquid volume in the second branch pipe 2062 and the third branch pipe 2063 is greater than the total volume of solution required for rinsing and calibration of the first cylinder 103. Based on the quantitative volume of the solution in the second cylinder 203 plus the liquid volume in the second branch pipe 2062 and the third branch pipe 2063, the required weight of solid reagent 304 is calculated. After weighing and packaging the solid reagent 304, it is placed in the first through hole 3031.

[0044] In this embodiment, the bottom of the first cylinder 103 is connected to a first liquid outlet pipe 106, and a valve 105 is installed on the first liquid outlet pipe 106. When it is necessary to discharge the liquid from the first cylinder 103, the valve 105 is opened to discharge the liquid. A second overflow port is provided on the side wall of the first cylinder 103. The height of the second overflow port is higher than that of the first liquid level sensor 102. The second overflow port protects the first cylinder 103 and prevents excessive liquid in the first cylinder 103. An overflow pipe 104 is connected to the second overflow port. The end of the overflow pipe 104 away from the second overflow port extends downward. The end of the first liquid outlet pipe 106 away from the first cylinder 103 and the bottom end of the overflow pipe 104 are connected to the second liquid outlet pipe. A second three-way valve 107 is connected to the second liquid outlet pipe. The waste liquid and wastewater discharged from the first cylinder 103 are discharged separately through the second three-way valve 107 for convenient treatment.

[0045] In this embodiment, a water supply pipe 401 is connected to the side wall of the first cylinder 103; the water supply pipe 401 is sequentially connected to a second power pump 402 and a third three-way valve 403, and the other two ports of the third three-way valve 403 are respectively connected to an inlet pipe and a cleaning pipe. Water sample is introduced into the inlet pipe and cleaning water is introduced into the cleaning pipe. When the water sample is tested, the water sample is first pumped into the first cylinder 103 through the third three-way valve 403 and the second power pump 402. The water quality monitoring sensor 101 tests the water sample. Then the cleaning water is pumped into the first cylinder 103 to clean the water supply pipe 401 and the first cylinder 103.

[0046] In this embodiment, the water quality monitoring sensor 101 includes, but is not limited to, a pH sensor, a conductivity sensor, a dissolved oxygen sensor, a chlorophyll sensor, and a blue-green algae sensor. The solid reagent 304 is a solid chemical reagent used to calibrate the water quality monitoring sensor 101.

[0047] In another aspect, the present invention provides an automatic calibration method for an online water quality monitoring sensor, employing the aforementioned automatic calibration device for an online water quality monitoring sensor, comprising the following steps:

[0048] S1. Place the solid reagent 304 into the second cylinder 203 through the feed port 205, start the first motor 201, drive the rotating cutter 202 to rotate, and cut open the moisture-proof packaging film of the solid reagent 304.

[0049] Specifically, placing the solid reagent 304 into the second cylinder 203 from the feed port 205 includes the following steps: starting the second motor 301, driving the drive seat 303 to rotate, pushing the solid reagent 304 to the second through hole 3021, and the solid reagent 304 sliding into the second cylinder 203 through the guide 305;

[0050] More specifically, when the online calibration device for the water quality sensor is first set up or when the device needs to be repaired, the following steps are performed: Adjust the position of the second liquid level sensor 204 so that the quantitative volume of the solution in the second cylinder 203 plus the liquid volume in the second branch pipe 2062 and the third branch pipe 2063 is greater than the total volume of solution required for rinsing and calibration of the first cylinder 103. Calculate the required weight of solid reagent 304 based on the quantitative volume of the solution in the second cylinder 203 plus the liquid volume in the second branch pipe 2062 and the third branch pipe 2063. Weigh the solid reagent 304, package it, and place it in the first through hole 3031.

[0051] S2. Switch the first three-way valve 208 to connect the first interface and the third interface, start the first power pump 207, and pump pure water into the second cylinder 203 through the pure water pipe 209. When the liquid level reaches the height of the second liquid level sensor 204, stop pumping pure water.

[0052] Specifically, after stopping the pumping of pure water, the first three-way valve 208 is switched to connect to the second and third interfaces, the first power pump 207 is started, and after a certain delay, it is stopped, so that the pure water in the second branch pipe 2062 and the third branch pipe 2063 is pumped into the second cylinder 203.

[0053] S3. Start the first motor 201 to drive the rotating blade 202 to rotate, stir the liquid in the second cylinder 203, and stop after a period of time. Let the liquid in the second cylinder 203 stand still for a certain period of time to complete the preparation of the standard solution.

[0054] S4. Switch the first three-way valve 208 to connect the second and third interfaces, rotate the first power pump 207 in reverse, and pump the prepared standard solution into the first cylinder 103. After rinsing the first cylinder 103, drain it into the waste liquid.

[0055] S5. Pump the standard solution back into the first cylinder 103. Stop when the liquid level reaches the position of the first liquid level sensor 102. The water quality monitoring sensor 101 starts calibration.

[0056] S6. Switch the first three-way valve 208 to connect the first interface and the third interface, start the first power pump 207, pump the pure water in the pure water pipe 209 into the second cylinder 203, and stop after the pure water overflows a certain volume from the first overflow port 210 after the pure water is in excess, and discharge the packaging film of the solid reagent 304 from the first overflow port 210.

[0057] S7. Switch the first three-way valve 208 to connect the second and third ports, rotate the first power pump 207 in reverse to pump the pure water in the second cylinder 203 into the first cylinder 103, and then open the valve to discharge the liquid in the first cylinder 103 to waste liquid.

[0058] Specifically, steps S6 and S7 can be repeated to clean the second cylinder 203 and the first cylinder 103 in preparation for the next calibration.

Claims

1. A water quality on-line monitoring sensor automatic calibration device, characterized in that, The utility model relates to a water quality monitoring device, including measuring part and calibration solution preparation part, The measuring part includes a first cylinder (103) with a water quality monitoring sensor (101) installed inside; The calibration solution preparation part includes a second cylinder (203) with a feed inlet (205) at the top, a liquid container cavity inside, a first rotating shaft vertically arranged inside the cavity, a rotary cutter (202) installed on the first rotating shaft, and a first driving mechanism below the cavity to drive the first rotating shaft to rotate; One end of the infusion tube (206) is connected to the side wall of the second cylinder (203) and is arranged at the bottom of the liquid container cavity, and the other end is connected to the side wall of the first cylinder (103); the infusion tube (206) is connected to a pure water pipe (209) through a control device.

2. The water quality on-line monitoring sensor automatic calibration device according to claim 1, characterized in that, The control device includes a first power pump (207), a first three-way valve (208), and a controller; the infusion tube (206) includes a first branch pipe (2061), a second branch pipe (2062), and a third branch pipe (2063); one end of the first branch pipe (2061) is connected to the side wall of the first cylinder (103), and the other end is connected to the second interface of the first three-way valve (208); one end of the second branch pipe (2062) is connected to the third interface of the first three-way valve (208), and the other end is connected to the first interface of the first power pump (207); one end of the third branch pipe (2063) is connected to the second interface of the first power pump (207), and the other end is connected to the side wall of the first cylinder (103); one end of the pure water pipe (209) is connected to the first interface of the first three-way valve (208); the controller is electrically connected to the first power pump (207) and the first three-way valve (208).

3. The water quality on-line monitoring sensor automatic calibration device according to claim 1, characterized in that, The first cylinder (103) is internally provided with a first liquid level sensor (102); the height of the first liquid level sensor (102) is lower than the height of the infusion tube (206); the second cylinder (203) is internally provided with a second liquid level sensor (204) above the rotary cutter (202).

4. The water quality on-line monitoring sensor automatic calibration device according to claim 1, characterized in that, A first overflow port (210) is formed above the side wall of the second cylinder (203).

5. The water quality on-line monitoring sensor automatic calibration device according to claim 1, characterized in that, The utility model also includes a sample feeding part, which includes a fixed seat (302) and a driving seat (303); the driving seat (303) is arranged above the fixed seat (302), and a plurality of first through holes (3031) are uniformly distributed on the driving seat (303); a solid reagent (304) is arranged in each first through hole (3031), and the solid reagent (304) is packaged by a moisture-proof packaging film; a second through hole (3021) corresponding to any one first through hole (3031) is formed on the fixed seat (302); the second through hole (3021) is above the feed inlet (205) and corresponds to the feed inlet (205); the driving seat (303) is connected to a second driving mechanism to drive the driving seat (303) to rotate.

6. The water quality on-line monitoring sensor automatic calibration device according to claim 5, characterized in that, The second driving mechanism comprises a second motor (301), which is arranged below a fixed seat (302) and has a second rotating shaft connected to an output shaft of the second motor (301); the second rotating shaft passes through the fixed seat (302) and is connected to a driving seat (303).

7. The water quality on-line monitoring sensor automatic calibration device according to claim 5, characterized in that, The fixed seat (302) is fixed with a guide (305) at the bottom; the guide (305) is provided with a third through hole corresponding to the second through hole (3021); and the bottom of the guide (305) extends to above the feeding port (205).

8. The water quality on-line monitoring sensor automatic calibration device according to claim 1 or 3, characterized in that, The first cylinder (103) is communicated with a first liquid outlet pipe (106) at the bottom, and the first liquid outlet pipe (106) is provided with a valve (105); the side wall of the first cylinder (103) is provided with a second overflow port; the height of the second overflow port is higher than that of the first liquid level sensor (102); the second overflow port is connected with an overflow pipe (104); the end of the overflow pipe (104) away from the second overflow port extends downward; the end of the first liquid outlet pipe (106) away from the first cylinder (103) and the bottom end of the overflow pipe (104) are connected with a second liquid outlet pipe; and the second liquid outlet pipe is connected with a second three-way valve (107).

9. A method for automatic calibration of an online water quality monitoring sensor, characterized in that, The water quality on-line monitoring sensor automatic calibration device is calibrated by the steps of: S1, the solid reagent (304) is placed into the second cylinder (203) from the feeding port (205), the first motor is started, and the rotary cutter (202) is driven to rotate to cut the moisture-proof packaging film of the solid reagent (304); S2, the first three-way valve (208) is switched to be communicated with the first interface and the third interface, the first power pump (207) is started, and pure water is pumped into the second cylinder (203) through the pure water pipe (209), when the liquid level reaches the height of the second liquid level sensor (204), the pumping of the pure water is stopped; S3, the first motor is started, the rotary cutter (202) is driven to rotate, the liquid in the second cylinder (203) is stirred, and after a period of time, the liquid in the second cylinder (203) is stopped for a certain period of time, and the preparation of the standard solution is completed; S4, the first three-way valve (208) is switched to be communicated with the second interface and the third interface, the first power pump (207) is reversed, the prepared standard solution is pumped into the first cylinder (103), the first cylinder (103) is rinsed, and then the first cylinder (103) is emptied; S5, the standard solution is pumped into the first cylinder (103) again, and when the liquid level reaches the position of the first liquid level sensor (102), the water quality monitoring sensor (101) is started to calibrate.

10. The method of claim 9, wherein, The following steps are further included: S6, the first three-way valve (208) is switched to be communicated with the first interface and the third interface, the first power pump (207) is started, the pure water in the pure water pipe (209) is pumped into the second cylinder (203), and after the pure water overflows a certain volume from the first overflow port (210), the pumping is stopped, the packaging film of the solid reagent (304) is discharged from the first overflow port (210), and S7, switch the first three-way valve (208) to the second interface and the third interface in communication, reverse the first power pump (207) to pump the pure water in the second cylinder (203) from the second cylinder (203) into the first cylinder (103), and then open the valve (105) to discharge the liquid in the first cylinder (103).

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