Spectrophotometric water quality detection equipment and method based on ambient light interference suppression

Abstract

The invention discloses spectrophotometric water quality detection equipment and method based on ambient light interference suppression, and belongs to the technical field of water quality detection.The spectrophotometric water quality detection equipment comprises a detector, a detection bin is formed in the inner side of the detector, a detection head is installed on the side wall of the detection bin, and a cover door is rotationally installed above the detection bin; a fixed plate is fixedly mounted at the bottom of the detection bin, a sliding plate is slidably mounted on the fixed plate, a lifting plate is mounted above the sliding plate through a lifting structure, a gas transmission assembly used for cleaning the detection head is mounted between the sliding plate and the lifting plate, and a supporting seat is elastically slidably mounted on the lifting plate; cuvettes are uniformly and fixedly mounted on the supporting seat. According to the spectrophotometric water quality detection equipment and method based on ambient light interference suppression, a water sample can be conveniently taken, placed and shaken up, the detection head can be automatically cleaned, and meanwhile, the detection precision is effectively improved by cooperating with suppression of ambient light interference.

Description

Technical Field

[0001] This invention relates to the field of water quality testing technology, specifically to a spectrophotometric water quality testing device and method based on the suppression of ambient light interference. Background Technology

[0002] Spectrophotometry, as one of the most widely used core technologies in the field of water quality testing, is based on the Lambert-Beer law. It uses light of a specific wavelength to pass through the water sample to be tested, and takes advantage of the selective absorption characteristics of pollutants in the water to detect the intensity of the transmitted light and calculate the concentration of pollutants. It has the advantages of simple operation, fast detection speed, controllable cost, and wide detection range. It can realize the rapid detection of various water quality indicators such as COD (chemical oxygen demand), ammonia nitrogen, total phosphorus, and heavy metal ions, and is widely used in environmental monitoring, drinking water treatment, industrial wastewater discharge monitoring and other scenarios.

[0003] The prior art (Chinese patent No. CN214894833U, published on 2021-11-26) discloses a sampling device for an atomic absorption spectrophotometer, including a sampling cup holder containing a sampling cup and a PLC controller for controlling the overall movement of the device. The sampling cup holder is mounted on a moving mechanism that can move left and right to move the sampling cup directly below the sampling tube of the atomic absorption spectrophotometer. The moving mechanism is mounted on a lifting plate and is raised and lowered by a lifting mechanism located at the bottom of the lifting plate. The controlled ends of the moving mechanism and the lifting mechanism are respectively connected to the output end of the PLC controller. By mounting the sampling cup holder on the moving mechanism and raising and lowering the moving mechanism through the lifting mechanism, the atomic absorption spectrophotometer can automatically complete the sampling operation, realize the automatic picking and placing of the sampling cup, eliminate the need for manual picking and placing of the sampling cup, free up manual labor, and improve work efficiency.

[0004] The prior art (Chinese patent publication number: CN218865763U, publication date: 2023-04-14) discloses a convenient fixed ultra-micro spectrophotometer, including a spectrophotometer body. A measuring chamber is provided at one end of the interior of the spectrophotometer body. A cover plate is rotatably connected to the upper end of the measuring chamber, and two guide rods are fixed to the lower side of the measuring chamber. A slide is slidably connected to the outer side of the two guide rods. A pull rod extending to the outside of the measuring chamber of the spectrophotometer body is fixed to one end of the slide, and two guide columns are fixed to the upper two ends of the slide. When the cover plate is rotated upward to open through a linkage lifting mechanism, the cover plate drives the fixed connecting rod and the cam shaft to rotate through the rotating connecting rod. The cam shaft drives the cam to rotate, and the cam can lift the cuvette holder upward, thereby facilitating the staff to pick up and put down the cuvette and preventing the cuvette from falling due to the narrow space when picking up and putting down the cuvette.

[0005] The fixed cuvette mounting structure of existing spectrophotometric water quality testing equipment makes it inconvenient to handle samples and shake them during placement, resulting in limited detection accuracy and certain usability defects. Summary of the Invention

[0006] The purpose of this invention is to provide a spectrophotometric water quality testing device and method based on ambient light interference suppression, so as to solve the problem mentioned in the background art that the cuvette installation structure of the spectrophotometric water quality testing devices on the market is fixed, which makes it inconvenient to pick up and put down the sample, and also inconvenient to shake the water sample during the sample placement process.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a spectrophotometric water quality detection device and method based on ambient light interference suppression, comprising a detector, a detection chamber with an inner side, a detection head mounted on the side wall of the detection chamber, a cover door rotatably mounted on the top of the detection chamber, a fixed plate fixedly mounted on the bottom of the detection chamber, a sliding plate slidably mounted on the fixed plate, and a lifting plate mounted above the sliding plate via a lifting structure, an air supply component for cleaning the detection head being installed between the sliding plate and the lifting plate, a support seat elastically slidably mounted on the lifting plate, cuvettes being uniformly fixedly mounted on the support seat, a sample dish being positioned inside the cuvette, and a sealing cap assembly for sealing the sample dish being installed on the outside of the cuvette.

[0008] Preferably, a sealing ring is installed between the detector and the cover, and the interior of the detection chamber is coated with a frosted matte finish.

[0009] Preferably, fixing blocks are symmetrically fixedly installed on the upper surfaces of both ends of the fixing plate, and guide rods are symmetrically fixedly installed between the two fixing blocks. The sliding plate is slidably installed on the outside of the guide rods, and a pull rod is fixedly installed on the sliding plate. The pull rod is slidably installed on the housing of the detector.

[0010] Preferably, the lifting structure includes a motor fixedly mounted on the slide plate, and a lead screw is fixedly mounted on the output end of the motor. The two ends of the lead screw have opposite thread directions, and the outer side of the lead screw is symmetrically connected to a slider. A connecting rod is hinged between the slider and the lifting plate, and when the two sliders slide close together, the lifting plate is pushed up and adjusted by the connecting rod.

[0011] Preferably, the air supply assembly includes an elastic bladder fixedly installed between the slide plate and the lifting plate, and the elastic bladder is connected to an air inlet filter pipe and a purge cleaning pipe. The air inlet filter pipe and the purge cleaning pipe are equipped with one-way valves, and the outlet of the purge cleaning pipe faces outward from the detection head.

[0012] Preferably, a sliding rod is slidably installed above the lifting plate, and a support base is fixedly installed above the sliding rod. A spring is fixedly connected between the lifting plate and the support base, and a baffle is fixedly installed on the outer side of the sliding rod.

[0013] Preferably, a guide plate is fixedly installed on the outer side of the slide plate, and protrusions are evenly arranged on the outer side of the guide plate. During the lifting process, the baffle slides along the outer side of the guide plate, and the support seat reciprocates elastically under the action of the baffle during the lifting process.

[0014] Preferably, the inner wall of the cuvette is symmetrically fixed with elastic clips, the clips are arranged in an arc shape, and the clips are held on the outside of the sample dish.

[0015] Preferably, the sealing assembly includes a cover plate that is elastically rotatably mounted on the outside of the cuvette, and the cover plate is arranged in an L-shape. A first magnetic sheet is fixedly mounted on the outside of the cover plate, and a second magnetic sheet is fixedly mounted on the inner wall of the detection chamber. The first magnetic sheet and the second magnetic sheet have the same magnetic poles, and the second magnetic sheet is located outside the movement trajectory of the first magnetic sheet.

[0016] A detection method for a spectrophotometric water quality testing device based on ambient light interference suppression, the specific steps of which are as follows:

[0017] S1. Open the cover door and start the motor. The motor will push the lifting plate upward through the lifting structure, which will then move the cuvette upward in the detection chamber. When the cuvette moves to the highest point, the cover plate will rotate elastically under the magnetic force of the first and second magnetic sheets. Then, insert the sample dish containing the sample water into the cuvette.

[0018] S2. Control the lifting plate to move down, so that the cover plate rotates and resets to cover the sample dish port. At the same time, the support base moves down and swings back and forth under the guidance of the guide plate to achieve the mixing of water sample in the sample dish.

[0019] S3 controls the light emitted from the detection head to pass through the cuvette and sample dish to achieve water quality detection. The pull rod can be used to move the slide plate to adjust the horizontal position of the cuvette.

[0020] Compared with the prior art, the beneficial effects of the present invention are: the spectrophotometric water quality detection equipment and method based on ambient light interference suppression can conveniently pick up and put down water samples and shake them evenly, and can realize automatic cleaning of the detection head. At the same time, in combination with the suppression of ambient light interference, the detection accuracy is effectively improved.

[0021] 1. It is equipped with a cover and sealing ring. The sealing ring can effectively improve the sealing performance after the cover is closed, preventing ambient light from entering the detection chamber. The interior of the detection chamber is coated with a frosted matte finish to prevent external ambient light from interfering with the detection accuracy.

[0022] 2. Equipped with a lifting plate and a support base, the motor drives the lead screw to rotate reciprocally, causing the lead screw to drive two sliders to move closer together. This causes the sliders to move the lifting plate upward via a connecting rod, thus lifting the cuvette upward for easy handling. When the lifting plate moves downward, the baffle slides along the guide plate, which pushes the support base to move reciprocally and elastically, thus shaking the water sample in the cuvette. During the shaking of the cuvette, the cover plate seals the port of the cuvette.

[0023] 3. It is equipped with an elastic bladder, an air inlet filter pipe, and a purge cleaning pipe. As the lifting plate moves upward, it works with the sliding plate to stretch the elastic bladder, allowing the elastic bladder to draw in filtered clean gas through the air inlet filter pipe. When the lifting plate moves downward, it squeezes the elastic bladder, causing the gas in the elastic bladder to be blown towards the detection head through the purge cleaning pipe, thereby achieving automatic purging and cleaning of the detection head and further improving detection accuracy. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0025] Figure 2 This is a top view of the structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the skateboard mounting structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the elastic bladder installation structure of the present invention;

[0028] Figure 5 This is a schematic diagram of the lifting plate installation structure of the present invention;

[0029] Figure 6 This is a schematic diagram of the disassembled structure of the lifting plate and support base of the present invention;

[0030] Figure 7 This is a schematic cross-sectional view of the detection chamber of the present invention;

[0031] Figure 8 For the present invention Figure 7 Enlarged structural diagram at point A in the middle;

[0032] Figure 9 This is a schematic cross-sectional view of the cuvette structure of the present invention.

[0033] In the diagram: 1. Detector; 101. Detection head; 2. Detection chamber; 3. Cover; 4. Sealing ring; 5. Fixing plate; 6. Fixing block; 7. Guide rod; 8. Slide plate; 801. Guide plate; 9. Pull rod; 10. Motor; 11. Lead screw; 12. Slider; 13. Lifting plate; 14. Connecting rod; 15. Elastic capsule; 16. Air inlet filter; 17. Purge cleaning pipe; 18. Slide rod; 19. Support base; 20. Spring; 21. Baffle; 22. Cuvette; 23. Sample dish; 24. Clamping plate; 25. Cover plate; 26. First magnetic plate; 27. Second magnetic plate. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Example 1: Existing spectrophotometric water quality testing equipment is inconvenient for handling water samples, including taking them in, placing them out, and shaking them. To solve this technical problem, this example discloses the following technical details. Please refer to [link / reference]. Figure 1 and Figures 3-9 As shown;

[0036] A spectrophotometric water quality testing device based on ambient light interference suppression includes a detector 1, a detection chamber 2 with an inner opening on the detector 1, a detection head 101 installed on the side wall of the detection chamber 2, a cover 3 rotatably installed on the top of the detection chamber 2, a fixing plate 5 fixedly installed on the bottom of the detection chamber 2, a sliding plate 8 slidably installed on the fixing plate 5, a lifting plate 13 installed above the sliding plate 8 via a lifting structure, a support base 19 elastically slidably installed on the lifting plate 13, cuvettes 22 uniformly fixedly installed on the support base 19, a sample dish 23 positioned inside the cuvette 22, and a sealing cap assembly for sealing the sample dish 23 installed on the outside of the cuvette 22.

[0037] A sealing ring 4 is installed between the detector 1 and the cover 3. The interior of the detection chamber 2 is coated with a frosted matte finish. Fixing blocks 6 are symmetrically fixed on the upper surfaces of both ends of the fixing plate 5. Guide rods 7 are symmetrically fixed between the two fixing blocks 6. The slide plate 8 is slidably installed on the outside of the guide rods 7. A pull rod 9 is fixedly installed on the slide plate 8. The pull rod 9 is slidably installed on the housing of the detector 1. The lifting structure includes a motor 10 fixedly installed on the slide plate 8. A lead screw 11 is fixedly installed at the output end of the motor 10. The two ends of the lead screw 11 have opposite threads. A slider 12 is symmetrically threaded on the outside of the lead screw 11. A connecting rod 14 is hinged between the slider 12 and the lifting plate 13. When the two sliders 12 slide close together, the lifting plate 13 is pushed up and adjusted by the connecting rod 14. A sliding rod 18 is slidably installed above the lifting plate 13. A support base 19 is fixedly installed above the sliding rod 18. The lifting plate 13 and the support base 19 are connected together. A spring 20 is fixedly connected between the slide bar 18 and the slide plate 8. A baffle 21 is fixedly installed on the outside of the slide bar 18. A guide plate 801 is fixedly installed on the outside of the slide plate 8. Protrusions are evenly arranged on the outside of the guide plate 801. During the lifting process of the lifting plate 13, the baffle 21 slides along the outside of the guide plate 801. At the same time, during the lifting process of the lifting plate 13, the support seat 19 reciprocates elastically under the action of the baffle 21. Elastic clips 24 are symmetrically fixedly installed on the inner wall of the cuvette 22. The clips 24 are arc-shaped and clamp the sample dish 23 on the outside. The sealing assembly includes a cover plate 25 that is elastically rotatably installed on the outside of the cuvette 22. The cover plate 25 is L-shaped and a first magnetic sheet 26 is fixedly installed on the outside of the cover plate 25. A second magnetic sheet 27 is fixedly installed on the inner wall of the detection chamber 2. The magnetic poles of the first magnetic sheet 26 and the second magnetic sheet 27 are the same, and the second magnetic sheet 27 is located outside the movement trajectory of the first magnetic sheet 26.

[0038] When testing is required, the cover door 3 is opened, and the motor 10 is started. This drives the lead screw 11 to rotate reciprocally, causing the lead screw 11 to drive the two sliders 12 to move closer together. The sliders 12 then move the lifting plate 13 upwards via the connecting rod 14, thereby lifting the support base 19 and the cuvette 22 upwards. This brings the cuvette 22 closer to the opening of the testing chamber 2, facilitating the placement and removal of the sample dish 23. When the cuvette 22 reaches its highest position, the first magnetic sheet 26 and the second magnetic sheet 27 are at the same horizontal level, causing the cover plate 25 to rotate elastically under magnetic force. The sample dish 23 containing the water sample is then inserted into the cuvette. In step 22, the clamping plate 24 can clamp and fix the sample dish 23. Then, the lifting plate 13 is controlled to move down. At this time, the baffle 21 on the outside of the slide rod 18 will slide along the guide plate 801, thereby pushing the support seat 19 to reciprocate elastically, thus shaking the water sample in the sample dish 23. During the shaking of the sample dish 23, the cover plate 25 seals the port of the sample dish 23, and then the cover door 3 is closed. The sealing ring 4 can effectively improve the sealing performance of the cover door 3 after it is closed, preventing ambient light from entering the detection chamber 2. The interior of the detection chamber 2 is coated with a frosted matte coating to prevent external ambient light from interfering with the detection accuracy.

[0039] Example 2: The technical content disclosed in this example is a further improvement based on Example 1. Existing spectrophotometric water quality testing equipment is inconvenient for automatically cleaning the detection head 101. To further solve this technical problem, this example discloses the following technical content: Figure 2 and Figures 4-5 As shown;

[0040] An air supply assembly for cleaning the detection head 101 is installed between the slide plate 8 and the lifting plate 13. The air supply assembly includes an elastic bladder 15 fixedly installed between the slide plate 8 and the lifting plate 13. An air inlet filter pipe 16 and a purge cleaning pipe 17 are connected to the elastic bladder 15. One-way valves are provided on the air inlet filter pipe 16 and the purge cleaning pipe 17. The opening of the purge cleaning pipe 17 faces the outside of the detection head 101.

[0041] As the lifting plate 13 moves upward, it works with the sliding plate 8 to stretch the elastic bladder 15, allowing the elastic bladder 15 to draw in filtered clean gas through the air intake filter pipe 16. When the lifting plate 13 moves downward, it squeezes the elastic bladder 15, causing the gas in the elastic bladder 15 to be blown towards the detection head 101 through the purge cleaning pipe 17, thereby achieving automatic purging and cleaning of the detection head 101 and further improving detection accuracy.

[0042] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A spectrophotometric water quality testing device based on ambient light interference suppression, comprising a detector (1), wherein a detection chamber (2) is provided on the inner side of the detector (1), and a detection head (101) is installed on the side wall of the detection chamber (2), and a cover door (3) is rotatably installed on the top of the detection chamber (2). Its features are, A fixed plate (5) is fixedly installed at the bottom of the detection chamber (2), and a sliding plate (8) is slidably installed on the fixed plate (5). A lifting plate (13) is installed above the sliding plate (8) via a lifting structure. An air supply component for cleaning the detection head (101) is installed between the sliding plate (8) and the lifting plate (13). A support seat (19) is elastically slidably installed on the lifting plate (13), and cuvettes (22) are uniformly fixedly installed on the support seat (19). A sample dish (23) is positioned inside the cuvette (22), and a capping component for sealing the sample dish (23) is installed on the outside of the cuvette (22).

2. The spectrophotometric water quality detection device based on ambient light interference suppression according to claim 1, characterized in that: A sealing ring (4) is installed between the detector (1) and the cover (3), and the interior of the detection chamber (2) is coated with a frosted matte finish.

3. The spectrophotometric water quality detection device based on ambient light interference suppression according to claim 1, characterized in that: Fixing blocks (6) are symmetrically fixed on the upper surfaces of both ends of the fixing plate (5), and guide rods (7) are symmetrically fixed between the two fixing blocks (6). The sliding plate (8) is slidably installed on the outside of the guide rods (7), and a pull rod (9) is fixedly installed on the sliding plate (8). The pull rod (9) is slidably installed on the housing of the detector (1).

4. The spectrophotometric water quality detection device based on ambient light interference suppression according to claim 1, characterized in that: The lifting structure includes a motor (10) fixedly installed on the slide plate (8), and a lead screw (11) is fixedly installed at the output end of the motor (10). The two ends of the lead screw (11) have opposite threads. Meanwhile, the outer side of the lead screw (11) is symmetrically connected to a slider (12). A connecting rod (14) is hinged between the slider (12) and the lifting plate (13). When the two sliders (12) slide close together, the lifting plate (13) is pushed up and adjusted by the connecting rod (14).

5. The spectrophotometric water quality detection device based on ambient light interference suppression according to claim 1, characterized in that: The air delivery assembly includes an elastic bladder (15) fixedly installed between the slide plate (8) and the lifting plate (13), and the elastic bladder (15) is connected to an air inlet filter pipe (16) and a purge cleaning pipe (17). The air inlet filter pipe (16) and the purge cleaning pipe (17) are equipped with one-way valves, and the opening of the purge cleaning pipe (17) faces the outside of the detection head (101).

6. The spectrophotometric water quality detection device based on ambient light interference suppression according to claim 1, characterized in that: A slide rod (18) is slidably installed above the lifting plate (13), and a support seat (19) is fixedly installed above the slide rod (18). A spring (20) is fixedly connected between the lifting plate (13) and the support seat (19). A baffle (21) is fixedly installed on the outside of the slide rod (18).

7. The spectrophotometric water quality detection device based on ambient light interference suppression according to claim 6, characterized in that: The outer side of the slide plate (8) is fixedly installed with a guide plate (801), and the outer side of the guide plate (801) is uniformly provided with protrusions. During the lifting process of the lifting plate (13), the baffle (21) slides along the outer side of the guide plate (801), and at the same time, during the lifting process of the lifting plate (13), the support seat (19) reciprocates elastically under the action of the baffle (21).

8. The spectrophotometric water quality detection device based on ambient light interference suppression according to claim 1, characterized in that: The inner wall of the cuvette (22) is symmetrically fixed with elastic clips (24), and the clips (24) are arranged in an arc shape and are clamped to the outside of the sample dish (23).

9. A spectrophotometric water quality detection device based on ambient light interference suppression according to claim 1, characterized in that: The sealing assembly includes a cover plate (25) that is elastically rotatably mounted on the outside of the cuvette (22), and the cover plate (25) is arranged in an L-shape. A first magnetic sheet (26) is fixedly mounted on the outside of the cover plate (25), and a second magnetic sheet (27) is fixedly mounted on the inner wall of the detection chamber (2). The magnetic poles of the first magnetic sheet (26) and the second magnetic sheet (27) are the same, and the second magnetic sheet (27) is located outside the movement trajectory of the first magnetic sheet (26).

10. A spectrophotometric water quality detection device based on ambient light interference suppression according to claim 1, characterized in that, The detection method of the spectrophotometric water quality testing equipment was also disclosed. The specific steps are as follows: S1. Open the cover door (3) and start the motor (10). The motor (10) pushes the lifting plate (13) upward through the lifting structure, which in turn causes the lifting plate (13) to move the cuvette (22) upward in the detection chamber (2). When the cuvette (22) moves to the highest point, the cover plate (25) rotates elastically under the magnetic force of the first magnetic sheet (26) and the second magnetic sheet (27). Then, insert the sample dish (23) containing the sample water into the cuvette (22). S2. Control the lifting plate (13) to move down, so that the cover plate (25) rotates and resets to cover the port of the sample dish (23). At the same time, the support base (19) moves down and swings back and forth under the guidance of the guide plate (801) to achieve the shaking of the water sample in the sample dish (23). S3. The control head (101) emits light that passes through the cuvette (22) and sample dish (23) to achieve water quality detection. The lever (9) can be used to move the slide plate (8) to adjust the horizontal position of the cuvette (22).

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