1. The utility model provides a novel water quality analyzer, the on-line screen storage device comprises a base, a supporting plate, first carousel, the second carousel, a sample section of thick bamboo, and automatic sampling system, automatic sampling system includes the sample arm that the level set up, the vertical fixation is at the sample needle of sample arm front end, a rotary driving mechanism for driving sample arm pivoted, and be used for driving the first elevating system that the sample arm goes up and down, automatic color comparison device has been installed at the rear edge position of second carousel, below at the sample arm and be located and be provided with the washing box between first carousel and the second carousel, the overflow pipe is equipped with on the sample section of thick bamboo, the delivery port intercommunication of conveyer pipe and peristaltic pump is passed through to the bottom of a sample section of thick bamboo, the water inlet of peristaltic pump is used for connecting: the sample cylinder cleaning system comprises a three-way electromagnetic valve arranged on the conveying pipe, a first port of the three-way electromagnetic valve is communicated with the conveying pipe, a second port of the three-way electromagnetic valve is communicated with the bottom of the sample cylinder, and a third port of the three-way electromagnetic valve is used for discharging sewage; the sample cylinder cleaning system also comprises a swing arm arranged above the sample cylinder, a sealing cover fixed at the front end of the swing arm and used for sealing the top of the sample cylinder, a second lifting mechanism connected with the tail end of the swing arm and used for driving the swing arm to lift, and a second rotary driving mechanism connected with the second lifting mechanism and used for driving the second lifting mechanism and the swing arm to rotate around the tail end of the swing arm in a horizontal plane; the sealing cover is provided with a water-passing electromagnetic valve and a ventilation electromagnetic valve which are both communicated with the inside of the sealing cover; the sample cylinder cleaning system further comprises a water pump and an air heater, the water pump is connected with the water-through electromagnetic valve through a water pipe, and the air heater is connected with the ventilation electromagnetic valve through a ventilation pipe.

2. The novel water quality analyzer according to claim 1, characterized in that: and an overflow electromagnetic valve is arranged on the overflow pipe and used for controlling the on-off of the overflow pipe.

3. The novel water quality analyzer according to claim 1, characterized in that: the second lifting mechanism comprises an electric telescopic rod which is vertically arranged, the end part of a push rod of the electric telescopic rod is vertically fixed with the tail end of the swing arm, and the electric telescopic rod can stretch and retract to drive the swing arm to lift; the second rotary driving mechanism comprises a connecting seat and a servo motor, the connecting seat is connected with the supporting plate, the bottom of a shell of the electric telescopic rod is rotatably connected with the connecting seat, a driven wheel is sleeved outside the shell of the electric telescopic rod, the servo motor is located on the side portion of the electric telescopic rod and is fixedly connected with the supporting plate, a driving wheel is mounted on an output shaft of the servo motor, and the driving wheel is connected with the driven wheel through a transmission belt.

4. The novel water quality analyzer according to claim 1, characterized in that: the lower part of the inside of the sealing cover is provided with an annular abutting edge along the circumferential direction of the sealing cover, the abutting edge is used for abutting against the top surface of the sample cylinder, and an annular sealing gasket is further arranged at the abutting edge.

5. The novel water quality analyzer according to claim 4, characterized in that: the sealing washer is of a three-layer structure and sequentially comprises a first silica gel layer, a foaming rubber layer and a second silica gel layer.

6. The novel water quality analyzer according to claim 4, characterized in that: the sample container is characterized in that an accommodating groove which is annularly concave is formed in the lower portion of the inner portion of the sealing cover and located below the sealing washer along the circumferential direction of the sealing cover, an elastic sealing ring is arranged in the accommodating groove and used for being in contact with the outer side wall of the sample container, a sliding ring is arranged in the accommodating groove and located below the elastic sealing ring and used for tightly abutting against the elastic sealing ring, the inner side of the sliding ring protrudes towards the inner side of the sealing cover, and an annular flange is arranged on the outer wall of the upper portion of the sample container and used for being in contact with the sliding ring.

7. A water quality analysis method is characterized by comprising the following steps:

s1, rotating a sampling arm to the upper part of a sample cylinder, and extracting a water sample from the sample cylinder; after sampling is finished, in the process of executing the following steps, the top of the sample cylinder is sealed, and a connecting pipeline between the sample cylinder and the peristaltic pump is cut off; injecting clear water into the sealing cover, flushing the sample cylinder and discharging the clear water; introducing hot air into the sample cylinder, and quickly air-drying the sample cylinder;

s2, rotating the sampling arm to the position above the cuvette, and injecting the extracted water sample into the cuvette;

s3, rotating the sampling arm to the position above the cleaning box, and carrying out self-cleaning by the sampling system;

s4, rotating the sampling arm to the position above the medicament, and extracting the medicament from the medicament box;

s5, rotating the sampling arm to the position above the cuvette, and injecting a medicament into the cuvette filled with the water sample to obtain a mixed solution;

s6, the second turntable rotates, the cuvette carrying the mixed solution is moved to an automatic colorimetric device, and the automatic colorimetric device performs data analysis on the mixed solution to obtain an analysis result; when the second turntable rotates, the sampling arm rotates to the position above the cleaning box again, and the sampling system performs self-cleaning;

and S7, the sampling arm returns to the upper part of the sample cylinder, the water sample is extracted from the sample cylinder again, and before the water sample is extracted again, the sample cylinder is washed and air-dried.

8. The water quality analyzing method according to claim 7, wherein: the washing and air drying method comprises the steps that a three-way valve is additionally arranged between a sample cylinder and a peristaltic pump; after sampling, the top of the sample cylinder is sealed by a sealing cover; the three-way valve is controlled to cut off a connecting pipeline between the sample cylinder and the peristaltic pump; injecting clear water into the sealing cover, and flushing the sample cylinder to enable the clear water to flow out of the overflow pipe and the three-way valve of the sample cylinder simultaneously or alternately; and introducing hot air into the sealing cover to air-dry the sample cylinder, so that the hot air flows out from the overflow pipe and the three-way valve of the sample cylinder simultaneously or alternately.

9. The water quality analyzing method according to claim 7, wherein: after the reagent is injected into the cuvette filled with the water sample to obtain mixed liquid, the mixed liquid is repeatedly extracted and discharged through the sampling arm, so that the reagent and the water sample are fully mixed.

Background

The photoelectric colorimetry measures the absorbance of a series of standard solutions by means of a photoelectric colorimeter, draws a standard curve, and then calculates the content of the measured substance from the standard curve according to the absorbance of the measured solution.

In the prior art, a photoelectric colorimeter is generally used for detecting components in sample water, the photoelectric colorimeter is composed of a light source, a light filter, a cuvette and a photoelectric detector (a photoelectric cell and a galvanometer) which are distributed along a straight line, and according to the lambert-beer law, when the thickness (L) -of a measured solution liquid layer is determined, the concentration (c) of a substance in a solution is in direct proportion to the absorbance (E). I.e. the greater the concentration, the darker the colour, the greater the extent of light absorption, and in this case the lesser the intensity of the light. The light intensity is converted into current through a photocell, the absorbance of the measured substance is indicated according to the magnitude of the current, and then the concentration of the measured solution can be known by comparing the current with the standard solution, so that the content of the measured substance in the sample water can be known.

Chinese patent with application number 201710474827.X discloses a water quality analyzer and water quality analysis method, including first disc system, second disc system, color comparison system, cleaning system, mechanical sampling system, analytic system and well accuse display screen, but first disc system and second disc system axial rotation, be provided with a plurality of sample installation positions and medicament installation position on first disc system's the circumference, be provided with a plurality of cuvettes installation position on the second disc system, color comparison system set up the circumference position edge at second disc system, cleaning system and mechanical sampling system set up between first disc system and second disc system, analytic system be connected with color comparison system for analysis water quality parameter to transmit water quality parameter to well accuse display screen on.

This analysis appearance sends into a certain amount of water sample to appearance grade (sample cylinder) at every turn through the peristaltic pump, the water sample in the rethread sampling arm extraction appearance grade, inject the water sample into the cell of second disc system, the reagent position extraction that the rethread sampling arm extracted first disc system detects the medicament, will detect the medicament and inject into the cell that is equipped with the water sample in, thereby obtain the sample mixed liquid, the cell that second disc system will carry mixed liquid shifts the colorimetric system to the colorimetric system, carry out photoelectricity colorimetric analysis by the colorimetric system to the sample mixed liquid, thereby obtain the water quality analysis result.

However, when the water sample is extracted from the sample grade, the water sample in the sample grade cannot be completely extracted, and the water residue is inevitably left in the sample position, so that the residual water after the previous sampling can be mixed into the water sample pumped into the sample grade next time, the next sampling analysis is affected by the previous residual water, the accuracy of the water quality analysis result is reduced, the content of various components in the water sample cannot be accurately reflected, and the change of the water quality cannot be reflected in time by the analysis results for many times.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a water quality analyzer and a water quality analysis method, which have higher analysis accuracy.

In order to achieve the purpose, the invention provides the following technical scheme:

a novel water quality analyzer comprises a base, a supporting plate, a first rotary table, a second rotary table, a sample cylinder and an automatic sampling system, wherein the automatic sampling system comprises a sampling arm horizontally arranged, a sampling needle vertically fixed at the front end of the sampling arm, a first rotary driving mechanism used for driving the sampling arm to rotate, and a first lifting mechanism used for driving the sampling arm to lift, an automatic colorimetric device is arranged at the rear side edge part of the second rotary table, a cleaning box is arranged below the sampling arm and between the first rotary table and the second rotary table, an overflow pipe is arranged on the sample cylinder, the bottom of the sample cylinder is communicated with a water outlet of a peristaltic pump through a conveying pipe, a water inlet of the peristaltic pump is used for connecting an external water source, the novel water quality analyzer also comprises a sample cylinder cleaning system, the sample cylinder cleaning system comprises a three-way electromagnetic valve arranged on the conveying pipe, a first port of the three-way electromagnetic valve is communicated with the conveying pipe, the second port of the three-way electromagnetic valve is communicated with the bottom of the sample cylinder, and the third port of the three-way electromagnetic valve is used for discharging sewage; the sample cylinder cleaning system also comprises a swing arm arranged above the sample cylinder, a sealing cover fixed at the front end of the swing arm and used for sealing the top of the sample cylinder, a second lifting mechanism connected with the tail end of the swing arm and used for driving the swing arm to lift, and a second rotary driving mechanism connected with the second lifting mechanism and used for driving the second lifting mechanism and the swing arm to rotate around the tail end of the swing arm in a horizontal plane; the sealing cover is provided with a water-passing electromagnetic valve and a ventilation electromagnetic valve which are both communicated with the inside of the sealing cover; the sample cylinder cleaning system further comprises a water pump and an air heater, the water pump is connected with the water-through electromagnetic valve through a water pipe, and the air heater is connected with the ventilation electromagnetic valve through a ventilation pipe.

As a preferable scheme: and an overflow electromagnetic valve is arranged on the overflow pipe and used for controlling the on-off of the overflow pipe.

As a preferable scheme: the second lifting mechanism comprises an electric telescopic rod which is vertically arranged, the end part of a push rod of the electric telescopic rod is vertically fixed with the tail end of the swing arm, and the electric telescopic rod can stretch and retract to drive the swing arm to lift; the second rotary driving mechanism comprises a connecting seat and a servo motor, the connecting seat is connected with the supporting plate, the bottom of a shell of the electric telescopic rod is rotatably connected with the connecting seat, a driven wheel is sleeved outside the shell of the electric telescopic rod, the servo motor is located on the side portion of the electric telescopic rod and is fixedly connected with the supporting plate, a driving wheel is mounted on an output shaft of the servo motor, and the driving wheel is connected with the driven wheel through a transmission belt.

As a preferable scheme: the lower part of the inside of the sealing cover is provided with an annular abutting edge along the circumferential direction of the sealing cover, the abutting edge is used for abutting against the top surface of the sample cylinder, and an annular sealing gasket is further arranged at the abutting edge.

As a preferable scheme: the sealing washer is of a three-layer structure and sequentially comprises a first silica gel layer, a foaming rubber layer and a second silica gel layer.

As a preferable scheme: the sample container is characterized in that an accommodating groove which is annularly concave is formed in the lower portion of the inner portion of the sealing cover and located below the sealing washer along the circumferential direction of the sealing cover, an elastic sealing ring is arranged in the accommodating groove and used for being in contact with the outer side wall of the sample container, a sliding ring is arranged in the accommodating groove and located below the elastic sealing ring and used for tightly abutting against the elastic sealing ring, the inner side of the sliding ring protrudes towards the inner side of the sealing cover, and an annular flange is arranged on the outer wall of the upper portion of the sample container and used for being in contact with the sliding ring.

A water quality analysis method comprises the following steps:

s1, rotating a sampling arm to the upper part of a sample cylinder, and extracting a water sample from the sample cylinder; after sampling is finished, in the process of executing the following steps, the top of the sample cylinder is sealed, and a connecting pipeline between the sample cylinder and the peristaltic pump is cut off; injecting clear water into the sealing cover, flushing the sample cylinder and discharging the clear water; introducing hot air into the sample cylinder, and quickly air-drying the sample cylinder;

s2, rotating the sampling arm to the position above the cuvette, and injecting the extracted water sample into the cuvette;

s3, rotating the sampling arm to the position above the cleaning box, and carrying out self-cleaning by the sampling system;

s4, rotating the sampling arm to the position above the medicament, and extracting the medicament from the medicament box;

s5, rotating the sampling arm to the position above the cuvette, and injecting a medicament into the cuvette filled with the water sample to obtain a mixed solution;

s6, the second turntable rotates, the cuvette carrying the mixed solution is moved to an automatic colorimetric device, and the automatic colorimetric device performs data analysis on the mixed solution to obtain an analysis result; when the second turntable rotates, the sampling arm rotates to the position above the cleaning box again, and the sampling system performs self-cleaning;

and S7, the sampling arm returns to the upper part of the sample cylinder, the water sample is extracted from the sample cylinder again, and before the water sample is extracted again, the sample cylinder is washed and air-dried.

As a preferable scheme: the washing and air drying method comprises the steps that a three-way valve is additionally arranged between a sample cylinder and a peristaltic pump; after sampling, the top of the sample cylinder is sealed by a sealing cover; the three-way valve is controlled to cut off a connecting pipeline between the sample cylinder and the peristaltic pump; injecting clear water into the sealing cover, and flushing the sample cylinder to enable the clear water to flow out of the overflow pipe and the three-way valve of the sample cylinder simultaneously or alternately; and introducing hot air into the sealing cover to air-dry the sample cylinder, so that the hot air flows out from the overflow pipe and the three-way valve of the sample cylinder simultaneously or alternately.

As a preferable scheme: after the reagent is injected into the cuvette filled with the water sample to obtain mixed liquid, the mixed liquid is repeatedly extracted and discharged through the sampling arm, so that the reagent and the water sample are fully mixed.

Compared with the prior art, the invention has the advantages that: this water quality analyzer is owing to carry out thorough washing and rapid draing to the sample section of thick bamboo between twice taking a sample, will last time remain the moisture of the water sample in the sample section of thick bamboo and wash totally, avoid the last residual moisture of taking a sample sneak into the water sample of next time pumping in the sample section of thick bamboo to can eliminate the interference of preceding water sample residue to the water sample at the back, improve water quality analysis's the degree of accuracy.

Drawings

FIG. 1 is a schematic view of the overall structure of a water quality analyzer according to the first embodiment;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a schematic view of the internal structure of the closure according to the first embodiment;

FIG. 4 is a schematic view of a layer structure of a sealing gasket according to a first embodiment;

FIG. 5 is a schematic view showing the inner structure of a sealing cap according to a second embodiment;

fig. 6 is an enlarged view of a portion B in fig. 5.

1, a base; 2. a support plate; 3. a support pillar; 4. a first turntable; 5. a medicament installation site; 6. a second turntable; 7. a cuvette mounting location; 8. a first lifting mechanism; 9. a first rotary drive mechanism; 10. a sampling arm; 11. a sampling needle; 12. cleaning the box; 13. an automatic colorimetric device; 14. a sample cartridge; 15. an overflow pipe; 16. an overflow solenoid valve; 17. a delivery pipe; 18. a three-way electromagnetic valve; 19. a peristaltic pump; 20. a first drain pipe; 21. swinging arms; 22. sealing the cover; 23. a water-through electromagnetic valve; 24. a ventilation electromagnetic valve; 25. an electric telescopic rod; 26. a connecting seat; 27. a driven wheel; 28. a servo motor; 29. a driving wheel; 30. a transmission belt; 31. a water pump; 32. a hot air blower; 33. a water pipe; 34. a vent pipe; 35. a water collection tank; 36. a second sewage draining pipe; 37. an abutting edge; 38. a sealing gasket; 3801. a first silica gel layer; 3802. a foamed rubber layer; 3803. a second silica gel layer; 39. chamfering; 40. a containing groove; 41. an elastic sealing ring; 42. a slip ring; 43. a flange; 44. a spectrometer; 45. an optical fiber; 46. xenon lamps.

Detailed Description

The first embodiment is as follows:

referring to fig. 1 and 2, a novel water quality analyzer, including base 1, be provided with backup pad 2 above base 1, backup pad 2 passes through support column 3 and is connected fixedly with base 1, be equipped with first carousel 4 and second carousel 6 in backup pad 2, be provided with a plurality of medicaments installation position 5 along its circumferencial direction on first carousel 4, medicament installation position 5 is used for being equipped with the medicament box, be provided with a plurality of cuvettes installation position 7 along its circumferencial direction on second carousel 6, cuvettes installation position 7 is used for packing into the cuvettes, be provided with automatic sampling system between first carousel 4 and second carousel 6.

The automatic sampling system comprises a sampling arm 10 arranged horizontally, a sampling needle 11 vertically fixed at the front end of the sampling arm 10, a first rotary driving mechanism 9 for driving the sampling arm 10 to rotate around the tail end of the sampling arm, and a first lifting mechanism 8 for driving the first rotary driving mechanism 9 to lift together with the sampling arm 10.

The outer sides of the edges of the first rotating disc 4 and the second rotating disc 6 are covered with annular protective plates.

The automatic colorimetric device 13 is installed at the rear side edge part of the second rotary table 6, a through hole is formed in the position, corresponding to the automatic colorimetric device 13, of the guard plate of the second rotary table 6, and the through hole is used for allowing light emitted by the automatic colorimetric device 13 to pass through, so that the light can irradiate the cuvette installing position 7.

A wash cassette 12 is provided below the sampling arm 10 and between the first carousel 4 and the second carousel 6.

A sample cylinder 14 is arranged below the sampling arm 10 and on the running path of the sampling needle 11, a peristaltic pump 19 is arranged below the sample cylinder 14, the bottom of the sample cylinder 14 is communicated with the water outlet of the peristaltic pump 19 through a conveying pipe 17, and the water inlet of the peristaltic pump 19 is used for connecting an external water source.

The water quality analyzer also includes a cleaning system for cleaning the sample cartridge 14.

The cleaning system comprises a three-way electromagnetic valve 18 arranged on a conveying pipe 17, a first port of the three-way electromagnetic valve 18 is communicated with the conveying pipe 17, a second port of the three-way electromagnetic valve 18 is communicated with the bottom of the sample cylinder 14, a third port of the three-way electromagnetic valve 18 is used for discharging sewage, and a first sewage discharge pipe 20 is arranged on the third port of the three-way electromagnetic valve 18 for conveniently discharging sewage.

A water collecting tank 35 is also arranged below the outlet of the overflow pipe 15, and the water collecting tank 35 is connected with a second sewage draining pipe 36.

The cleaning system further comprises a swing arm 21 horizontally arranged above the sample cylinder 14, a sealing cover 22 fixed at the front end of the swing arm 21 and used for sealing the top of the sample cylinder 14, a second lifting mechanism connected with the tail end of the swing arm 21 and used for driving the swing arm 21 to lift, and a second rotary driving mechanism connected with the second lifting mechanism and used for driving the second lifting mechanism and the swing arm 21 to rotate around the tail end of the swing arm 21 in a horizontal plane.

The lid 22 is provided with a water passage solenoid valve 23 and an air passage solenoid valve 24, and both the water passage solenoid valve 23 and the air passage solenoid valve 24 communicate with the inside of the lid 22.

The cleaning system also comprises a water pump 31 and a hot air blower 32, wherein the water pump 31 is connected with the water-through electromagnetic valve 23 through a water pipe 33, and the hot air blower 32 is connected with the ventilation electromagnetic valve through a ventilation pipe 34.

The working principle of the water quality analyzer is as follows:

initially, the three-way solenoid valve 18 communicates two ports of the delivery tube 17 and the sample cylinder 14, while the other port is closed, i.e., the first port communicates with the second port and the third port is closed. The sampling arm 10 is located between the first turntable 4 and the second turntable 6, with the sampling needle 11 located directly above the sample cylinder 14.

After the water quality analyzer is started, the peristaltic pump 19 pumps water from an external water source, a certain amount of water is sent into the sample cylinder 14, when the water is sent into the sample cylinder 14, redundant water is discharged from the overflow pipe 15, so that the water in the sample cylinder 14 is quantified, and then the peristaltic pump 19 stops running; then the first lifting mechanism 8 drives the sampling arm 10 to descend until the sampling needle 11 extends into the sample cylinder 14, and the sampling arm 10 extracts a water sample from the sample cylinder 14 through the sampling needle 11; then the first lifting mechanism 8 drives the sampling arm 10 to ascend until the sampling needle 11 is separated from the sample cylinder 14; then the first rotary driving mechanism 9 drives the sampling arm 10 to swing towards the second rotary table 6 until the sampling needle 11 is aligned with the cuvette on the second rotary table 6 (i.e. the sampling needle 11 is located right above the cuvette); then the first lifting mechanism 8 drives the sampling arm 10 to descend until the sampling needle 11 extends into the cuvette, and the sampling arm 10 injects a water sample into the cuvette through the sampling needle 11; then the first lifting mechanism 8 drives the sampling arm 10 to ascend until the sampling needle 11 is separated from the cuvette; the first rotary driving mechanism 9 drives the sampling arm 10 to swing towards the cleaning box 12 again until the sampling needle 11 is positioned right above the cleaning box 12; then the first lifting mechanism 8 drives the sampling arm 10 to descend until the sampling needle 11 extends into the cleaning box 12, the sampling arm 10 extracts the cleaning liquid from the cleaning box 12 through the sampling needle 11 and discharges the cleaning liquid, so as to clean the inside of the sampling arm 10 and the inside and the outside of the sampling needle 11, the cleaning process of the automatic sampling system is described in detail in the cited patent documents, and the description thereof is omitted! Cleaning the automatic sampling system can prevent the influence on the accuracy of the analysis result of the water sample caused by mixing of the water sample or medicament residue. After the automatic sampling system finishes cleaning, the first rotary driving mechanism 9 drives the sampling arm 10 to swing towards the first rotary disk 4 until the sampling needle 11 is aligned with the medicine box on the first rotary disk 4 (namely, the sampling needle 11 is positioned right above the medicine box); then the first lifting mechanism 8 drives the sampling arm 10 to descend until the sampling needle 11 extends into the medicament box, and then the sampling arm 10 extracts the medicament from the medicament box through the sampling needle 11; then the first lifting mechanism 8 drives the sampling arm 10 to ascend until the sampling needle 11 is separated from the medicine box; then, the first rotary driving mechanism 9 drives the sampling arm 10 to swing towards the second rotary disc 6 until the sampling needle 11 aligns with the cuvette filled with the water sample, and the first lifting system drives the sampling arm 10 to descend until the sampling needle 11 extends into the cuvette; then, the sampling arm 10 injects the reagent into the cuvette to mix the reagent with the water sample, and in the mixing process, the mixed solution can be repeatedly sucked and discharged through the sampling needle 11 to fully mix the water sample with the reagent to obtain the mixed solution; then the first lifting mechanism 8 drives the sampling arm 10 to ascend, so that the sampling needle 11 is separated from the cuvette; then the second rotating disk 6 rotates to move the cuvette carrying the mixed liquid to the automatic colorimetric device 13, wherein the automatic colorimetric device 13 contains the cuvette and an optical component, and the optical component consists of a xenon lamp 46, an optical fiber 45 and a spectrometer signal processor 44 for receiving light. In the analysis process, the xenon lamp 46 emits light with ultraviolet wavelength, the light irradiates the cuvette, the light reaches the spectrometer signal processor 44 through the optical fiber 45, the spectrometer signal processor 44 reads required signal data from the obtained full-spectrum scanning signal according to the setting of the current analysis parameter, and the concentration value of the sample can be obtained by signal data processing and signal operation.

When the second rotating disc 6 rotates, the sampling arm 10 returns to the upper part of the cleaning box 12, and the automatic sampling system finishes cleaning; the sampling arm 10 then returns to above the sample cylinder 14 and the next cycle of drawing a sample of water is performed.

After the sampling arm 10 extracts a water sample from the sample cylinder 14, when the sampling arm 10 leaves the sample cylinder 14, the second rotary driving mechanism immediately drives the swing arm 21 to rotate towards the sample cylinder 14 until the sealing cover 22 moves to be right above the sample cylinder 14, and then the second lifting mechanism drives the swing arm 21 to descend, so that the swing arm 21 descends together with the sealing cover 22 until the sealing cover 22 covers the top of the sample cylinder 14; then the three-way electromagnetic valve 18, namely the first port and the second port, is closed, the first port and the third port are communicated, and the bottom of the sample cylinder 14 is communicated with the first drain pipe 20; then the water pump 31 starts to operate, the water pump 31 sends clean water into the sealing cover 22 through the water pipe 33, at the moment, the clean water flushes the sample cylinder 14, residual moisture sampled at the last time is flushed away, one part of the flushed water flows out of the overflow pipe 15, and the other part of the flushed water is discharged from the third port of the three-way electromagnetic valve 18, so that the inside of the sample cylinder 14 can be effectively flushed, the part between the sample cylinder 14 and the three-way electromagnetic valve 18 can be effectively flushed, the influence of residues between the sample cylinder 14 and the three-way electromagnetic valve 18 on the next sampling can be prevented, and the water in the sample cylinder 14 can be fully drained; after the washing is finished, the water pump 31 stops running, the hot air blower 32 is started at the same time, at this time, the hot air blower 32 sends hot air into the sealing cover 22 through the vent pipe 34, the hot air enables moisture to evaporate rapidly, one path of the hot air is blown out of the overflow pipe 15, and the other path of the hot air flows out of the third opening of the three-way electromagnetic valve 18, so that the sample cylinder 14 and the part between the sample cylinder 14 and the three-way electromagnetic valve 18 can be dried rapidly; after the drying is finished, the second lifting mechanism drives the swing arm 21 to ascend to separate the sealing cover 22 from the sample cylinder 14, and then the second rotary driving mechanism drives the swing mechanism to swing to reset the sample cylinder; when the swing arm 21 starts to reset, the first port and the second port of the three-way electromagnetic valve 18 are switched on again, the third port of the three-way electromagnetic valve is switched off, and the peristaltic pump 19 pumps a certain amount of water sample into the sample cylinder 14 again; when the swing arm 21 resets, the sampling arm 10 just swings to the position right above the sample cylinder 14 again, and at the moment, the sample cylinder 14 is filled with a water sample, so as to wait for the next sampling, and the process is repeated.

This water quality analyzer is owing to carry out thorough washing and rapid draing to sample section of thick bamboo 14 between twice taking a sample, will last time remain the moisture of the water sample in sample section of thick bamboo 14 and wash totally, avoid the last residual moisture of taking a sample to mix into the water sample of next time pumping in sample section of thick bamboo 14 in to can eliminate the interference of preceding water sample residue to the water sample of back, improve water quality analysis's the degree of accuracy.

As shown in fig. 2, in this embodiment, an overflow solenoid valve 16 may be further installed on the overflow pipe 15, and the overflow solenoid valve 16 is used to control the on/off of the overflow pipe 15. During the process of flushing the sample cylinder 14 and air-drying the sample cylinder 14, the third ports of the overflow solenoid valve 16 and the three-way solenoid valve 18 can be controlled to be opened alternately, so that water flow and air flow alternately and intensively flow through the third ports of the overflow pipe 15 and the three-way solenoid valve 18, and better flushing and drying effects are achieved on the sample cylinder 14 and the part between the sample cylinder 14 and the three-way solenoid valve 18.

As shown in fig. 2, in this embodiment, the second lifting mechanism includes an electric telescopic rod 25 vertically disposed, an end of a push rod of the electric telescopic rod 25 is vertically fixed to a tail end of the swing arm 21, and the swing arm 21 can be driven to lift by extending and contracting the electric telescopic rod 25; the second rotary driving mechanism comprises a connecting seat 26 and a servo motor 28 which are connected with the supporting plate 2, the bottom of a shell of the electric telescopic rod 25 is rotatably connected with the connecting seat 26, a driven wheel 27 is sleeved outside the shell of the electric telescopic rod 25, the servo motor 28 is positioned on the side portion of the electric telescopic rod 25 and is fixedly connected with the supporting plate 2, a driving wheel 29 is mounted on an output shaft of the servo motor 28, the driving wheel 29 is connected with the driven wheel 27 through a transmission belt 30, and the servo motor 28 is controlled to rotate so as to drive the electric telescopic rod 25 to rotate together with the swing arm 21.

Referring to fig. 3, in the present embodiment, an annular abutting edge 37 is provided at a lower portion inside the cover 22 along the circumferential direction of the cover 22, and the abutting edge 37 is used for abutting against the top surface of the sample cartridge 14. To ensure the tightness of the cover 22, an annular sealing gasket 38 is also fitted at the abutment edge 37.

Referring to fig. 4, the sealing gasket 38 in this embodiment has a three-layer structure, and sequentially includes a first silicone rubber layer 3801, a foam rubber layer 3802, and a second silicone rubber layer 3803. The silica gel layer has good sealing performance and elasticity, the foaming rubber layer 3802 has good deformation capacity, and the silica gel layer is arranged on two sides of the foaming rubber layer 3802, so that the sealing washer 38 has good elastic deformation capacity and sealing performance, and the air tightness between the sealing cover 22 and the sample cylinder 14 is ensured.

To facilitate the entry of the top of the sample cartridge 14 into the cover 22, a chamfer 39 is provided on the inner wall of the bottom open area of the cover 22.

Example two:

referring to fig. 5 and 6, the present embodiment differs from the first embodiment in that: in the present embodiment, on the basis of the first embodiment, an accommodating groove 40 which is recessed in an annular shape is further provided at the lower portion of the inside of the cover 22 and below the sealing gasket 38 along the circumferential direction of the cover 22, an elastic sealing ring 41 is installed in the accommodating groove 40, the elastic sealing ring 41 is used for contacting with the outer side wall of the sample cylinder 14, a sliding ring 42 is installed in the accommodating groove 40 and below the elastic sealing ring 41, the sliding ring 42 abuts against the elastic sealing ring, the inner side of the sliding ring 42 protrudes towards the inner side of the cover 22, an annular flange 43 is provided on the outer wall of the upper portion of the sample cylinder 14, and the flange 43 is used for contacting with the sliding ring 42.

When the top of the sample cylinder 14 enters the inside of the cover 22, the flange 43 contacts the sliding ring 42 and pushes the sliding ring 42 to move upward, the sliding ring 42 presses the elastic sealing ring 41 from bottom to top, so that the elastic sealing ring 41 is pressed to deform, the elastic sealing ring 41 widens in the radial direction, and when the top surface of the sample cylinder 14 abuts against the sealing washer 38, the elastic sealing ring 41 just presses the outer wall of the sample cylinder 14, so that a second seal is formed between the cover 22 and the sample cylinder 14, the sealing performance between the two is greatly improved, and water leakage and air leakage are avoided. When the cover 22 is separated from the sample cartridge 14, the elastic sealing ring 41 returns to its original shape by its own elastic force, and the slip ring 42 moves downward to be restored.

Example three:

a water quality analysis method comprises the following steps:

s1, rotating a sampling arm 10 to a position above a sample cylinder 14, and extracting a water sample from the sample cylinder 14; after the sampling is finished, the top of the sample cylinder 14 is sealed, and the connecting pipeline between the sample cylinder 14 and the peristaltic pump 19 is cut off in the process of executing the following steps; injecting clean water into the sealing cover 22, flushing the sample cylinder 14 and discharging the clean water; then introducing hot air into the sample cylinder 14, and quickly air-drying the sample cylinder 14;

s2, rotating the sampling arm 10 to the position above the cuvette, and injecting the extracted water sample into the cuvette;

s3, the sampling arm 10 rotates to the position above the cleaning box 12, and the sampling system carries out self-cleaning;

s4, rotating the sampling arm 10 to the position above the medicament, and extracting the medicament from the medicament box;

s5, rotating the sampling arm 10 to the position above the cuvette, and injecting a medicament into the cuvette filled with the water sample to obtain a mixed solution;

s6, the second rotating disc 6 rotates, the cuvette carrying the mixed solution is moved to an automatic colorimetric device 13, and the automatic colorimetric device 13 performs data analysis on the mixed solution to obtain an analysis result; while the second rotary disk 6 is rotating, the sampling arm 10 rotates again to the upper part of the cleaning box 12, and the sampling system is self-cleaned;

s7, the sampling arm 10 returns to the position above the sample cylinder 14, the water sample is extracted from the sample cylinder 14 again, and before the water sample is extracted again, the sample cylinder 14 is washed and air-dried.

In this embodiment, the method of rinsing and air-drying includes: a three-way valve is additionally arranged between the sample cylinder 14 and the peristaltic pump 19; after sampling, the top of the sample cartridge 14 is closed by a closure 22; the three-way valve is controlled to cut off a connecting pipeline between the sample cylinder 14 and the peristaltic pump 19; clean water is injected into the sealing cover 22 to flush the interior of the sample cylinder 14, so that the clean water flows out of the overflow pipe 15 and the three-way valve of the sample cylinder 14 simultaneously or alternatively; then, hot air is introduced into the cap 22 to dry the sample container 14, so that the hot air flows out of the overflow pipe 15 and the three-way valve of the sample container 14 simultaneously or alternately.

In this embodiment, after the medicament is injected into the cuvette filled with the water sample and mixed liquid is obtained, mixed liquid is repeatedly extracted and discharged through the sampling arm 10, so that the medicament and the water sample are fully mixed.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.