Water quality chemical oxygen demand tester

Abstract

The utility model discloses a water quality chemical oxygen demand tester, and belongs to the field of water quality sample detection, the water quality chemical oxygen demand tester comprises a detection rack, a sample rack and a sample test tube, the sample rack slides in the detection rack, and the detection rack is provided with a moving assembly used for driving the sample rack to move; a sample to be detected is contained in the sample tube, the sample test tube is placed in the sample rack, and a burette for titrating a reagent and a stirring device for stirring the mixed reagent in the sample test tube are arranged on the detection rack in a sliding manner. The method has the effects of improving the detection accuracy and improving the safety of workers.

Description

Technical Field

[0001] This application relates to the field of water quality sample testing technology, and in particular to a water quality chemical oxygen demand (COD) analyzer. Background Technology

[0002] Chemical oxygen demand (COD) refers to the amount of oxidant consumed to oxidize reducing substances in 1 liter of water sample under certain conditions. It is calculated as oxygen content and expressed in mg / L. It is an important comprehensive indicator for evaluating the relative content of pollutants in water bodies, and also an important parameter for monitoring rivers and industrial wastewater and controlling sewage discharge from wastewater treatment plants. It is one of the important indicators for improving water environmental quality and implementing water pollutant reduction in my country.

[0003] Existing water quality chemical oxygen demand (COD) analyzers require the use of pre-mixed reagents in the testing process. These reagents contain potassium dichromate, mercuric sulfate, silver sulfate, and concentrated sulfuric acid, all of which are toxic, highly corrosive, and acidic chemicals. Furthermore, if the reagents are not mixed thoroughly with the water sample before digestion, the solution will splash during heating and digestion, increasing the risk of accidents. This not only introduces errors into the test but also endangers the safety of the staff. Utility Model Content

[0004] To increase detection accuracy and improve staff safety, this application provides a water quality chemical oxygen demand analyzer.

[0005] The water quality chemical oxygen demand (COD) analyzer provided in this application adopts the following technical solution:

[0006] The water quality chemical oxygen demand analyzer includes a test rack, a sample rack, and sample tubes. The sample rack slides within the test rack, and the test rack is equipped with a moving component for driving the sample rack to move. The sample tubes contain a sample to be tested and are placed within the sample rack. A burette for titrating reagents and a stirring device for stirring the mixed reagents in the sample tubes are slidably mounted on the test rack.

[0007] By adopting the above technical solution, the staff injects the water sample to be tested into the sample tube and places it on the sample rack. Under the action of the moving component, the sample rack moves into the test rack to the position of the burette. The burette slides down to the port of the sample tube for reagent titration. Subsequently, the sample rack continues to move to the stirring device under the action of the moving component. The stirring device fully stirs the mixed liquid in the sample tube, thereby reducing the possibility of solution splashing during sample heating and digestion, thus improving the detection accuracy and the safety of the staff.

[0008] Preferably, sliding grooves are provided on both side walls of the testing frame, and rotating rollers are rotatably connected to both ends of the sliding grooves. Two sets of moving components are provided, and each is disposed in one of the two sliding grooves. The moving components include a transmission belt, a first motor, and multiple moving plates. The two ends of the transmission belt are respectively wound around the two rotating rollers. The first motor is fixedly installed on the side wall of the testing frame and fixedly connected to one of the rotating rollers. The multiple moving plates are fixedly connected to the transmission belt. The two ends of the sample holder slide in the sliding grooves at both ends of the testing frame and are inserted between two adjacent moving plates.

[0009] By adopting the above technical solution, the first motor is set with a rotation speed and starting frequency before it is turned on. The first motor starts and drives the rotating roller to rotate, thereby driving the transmission belt to rotate. The staff places the sample rack with the sample placed on it on the detection rack. The sample rack slides in the sliding groove and is locked between two adjacent moving plates. The transmission belt moves and drives the moving plates to move. The moving plates push the sample rack to move, thereby pushing the sample rack from the end of the detection rack to the inner wall for titration and stirring.

[0010] Preferably, a support block is fixedly connected to the testing frame, an electric actuator is fixedly connected to the support block, one end of the electric actuator is fixedly connected to a support frame, and the burette is connected to the support frame.

[0011] By adopting the above technical solution, when the sample holder moves to the bottom of the burette, the electric actuator is activated, which moves the burette toward the sample tube to its port for titration of the reagent.

[0012] Preferably, the stirring device includes a sliding rod, a stirring rod rotatably mounted on the sliding rod, a sealing cap connected to the stirring rod, a rubber pad fixedly mounted on the sealing cap, the rubber pad abutting against the port of the sample tube, a rotating component for driving the stirring rod to rotate on the sliding rod, and a driving component for driving the sliding rod to move on the detection frame.

[0013] By adopting the above technical solution, after the sample tube is titrated with reagents through the burette, the sample tube moves under the drive of the transmission belt to the bottom of the stirring rod. At this time, the drive component drives the stirring rod to move down and extend into the sample tube. Subsequently, the stirring rod rotates under the drive of the rotating component to stir the mixture in the sample tube, so that it is fully mixed. The sealing cap can reduce the possibility of liquid splashing outside the sample tube during stirring, thereby reducing the possibility of contamination and safety accidents.

[0014] Preferably, the drive assembly includes two lead screws and two second motors. The detection frame has drive grooves on opposite side walls. The two ends of the sliding rod slide within the drive grooves. The two lead screws rotate within the two drive grooves. The two second motors are mounted on the two side walls of the detection frame. The two lead screws are fixedly connected to the two second motors. The two ends of the sliding rod are threadedly connected to the two lead screws.

[0015] By adopting the above technical solution, when the sample holder moves to below the sliding rod, the second motor starts, which drives the lead screw to rotate. The rotation of the lead screw drives the sliding rod to move, and the movement of the sliding rod drives the stirring rod to extend into the sample tube. When the rubber gasket on the sealing cap abuts against the port of the sample tube, the lead screw stops.

[0016] Preferably, the rotating assembly includes a worm gear, a turbine, and a third motor. The sliding rod has a placement groove inside, the stirring rod passes through and rotates on the inner wall of the placement groove, the turbine is fixedly sleeved on the stirring rod, the third motor is installed in the placement groove, the worm gear is fixedly connected to the rotating shaft of the third motor, and the turbine gear and the worm gear mesh with each other.

[0017] A rotating block is fixedly connected to the stirring rod, and a rotating groove is opened inside the sealing cover. The rotating block rotates in the rotating groove, and multiple balls are rotatably arranged on the inner wall of the rotating groove. The balls are slidably connected to the rotating block.

[0018] By adopting the above technical solution, when the sealing cap comes into contact with the sample tube opening, the third motor starts, the rotation of the third motor drives the worm gear to rotate, the rotation of the worm gear drives the turbine to rotate, the rotation of the turbine drives the stirring rod to rotate, when the stirring rod rotates, it drives the rotating block on it to rotate in the rotating groove, the ball bearings reduce the friction between the rotating block and the inner wall of the rotating groove, thereby reducing the possibility that the sealing cap will rotate with the stirring rod.

[0019] Preferably, a water tank is provided between the testing frames, and the stirring rod extends into the water tank.

[0020] By adopting the above technical solution, after the stirring rod completes the stirring in the sample tube, the stirring rod moves away from the sample tube under the drive of the lead screw and the second motor. After the sample tube is removed, the stirring rod extends into the water tank for cleaning under the drive of the lead screw and the second motor, thereby reducing cross-contamination and affecting the test results.

[0021] Preferably, the testing frame has a drying port on the opposite side wall, the drying port is located above the water tank, a blower is installed inside the testing frame, one end of the blower is connected to the drying port, and the other end of the blower is connected to the outside.

[0022] By adopting the above technical solution, when the stirring rod is reset after being cleaned in the water tank, a large amount of air blown out through the drying port can dry the moisture on the stirring rod, thereby reducing the impact on the detection accuracy when it is inserted into the sample tube for stirring.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. After the staff injects the water sample to be tested into the sample tube, it is placed on the sample rack. The sample rack moves into the test rack to the position of the burette under the action of the moving component. The burette slides down to the port of the sample tube for reagent titration. Subsequently, the sample rack continues to move to the stirring device under the action of the moving component. The stirring device thoroughly stirs the mixed liquid in the sample tube, thereby reducing the possibility of solution splashing during the heating and digestion of the sample, thus improving the detection accuracy and the safety of the staff.

[0025] 2. The first motor is set with a rotation speed and starting frequency before it is turned on. When the first motor is turned on, it drives the rotating roller to rotate, which in turn drives the transmission belt to rotate. The staff places the sample rack with the sample placed on it on the detection rack. The sample rack slides in the sliding groove and is engaged between two adjacent moving plates. The transmission belt moves, which drives the moving plates to move. The moving plates push the sample rack to move, so that the sample rack can be pushed from the end of the detection rack to the inner wall for titration and stirring.

[0026] 3. After the stirring rod finishes stirring in the sample tube, it moves away from the sample tube under the drive of the lead screw and the second motor. After the sample tube is removed, the stirring rod extends into the water tank for cleaning under the drive of the lead screw and the second motor, thereby reducing cross-contamination and affecting the test results. Attached Figure Description

[0027] Figure 1 This is an overall diagram of the water quality chemical oxygen demand (COD) analyzer.

[0028] Figure 2 This is a schematic diagram of the structure of the prominent moving component in the embodiments of this application.

[0029] Figure 3 This is a schematic diagram of the structure of the burette in the embodiments of this application.

[0030] Figure 4 This is a schematic diagram of the structure of the stirring rod in the embodiment of this application.

[0031] Figure 5 yes Figure 4 Enlarged view of point A in the middle.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Testing rack; 2. Sample rack; 3. Sample tube; 4. Moving assembly; 5. Burette; 6. Stirring device; 7. Sliding groove; 8. Rotating roller; 9. Transmission belt; 10. First motor; 11. Moving plate; 12. Support block; 13. Electric actuator; 14. Support frame; 15. Sliding rod; 16. Stirring rod; 17. Sealing cap; 18. Rubber pad; 19. Rotating assembly; 20. Drive assembly; 21. Lead screw; 22. Second motor; 23. Drive groove; 24. Worm gear; 25. Turbine; 26. Third motor; 27. Placement groove; 28. Rotating groove; 29. ​​Rotating block; 30. Ball bearing; 31. Water tank; 32. Drying port; 33. Blower. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0035] This application discloses an instrument for measuring the chemical oxygen demand (COD) of water, such as... Figure 1 and Figure 2 As shown, the water quality chemical oxygen demand (COD) analyzer includes a test rack 1 with a concave cross-section, a sample rack 2, and sample tubes 3. Multiple sample tubes 3 are placed on the sample rack 2; in this embodiment, the sample rack 2 can hold up to four sample tubes 3. Each sample tube contains a sample to be tested. The sample tubes 3 are placed inside the sample rack 2. Sliding grooves 7 are vertically formed on the end faces of both side walls of the test rack 1. Moving components 4 for driving the sample rack 2 are installed within the sliding grooves 7. A burette 5 for titrating reagents and a stirring device 6 for stirring the mixed reagents in the sample tubes 3 are slidably mounted on the test rack 1. The moving assembly 4 includes a transmission belt 9, a first motor 10, and multiple moving plates 11. Rollers 8 are rotatably mounted at both ends of the sliding groove 7. The two ends of the transmission belt 9 are wound around the two rollers 8. The first motor 10 is fixedly installed on the side wall of the detection frame 1 and fixedly welded to one of the rollers 8. Multiple moving plates 11 are fixedly welded to the surface of the transmission belt 9. The two ends of the sample holder 2 slide in the sliding grooves 7 at both ends of the detection frame 1 and are inserted between two adjacent moving plates 11.

[0036] like Figure 1 and Figure 2As shown, the first motor 10 is set with a rotation speed and starting frequency before starting. The first motor 10 starts, driving the rotating roller 8 to rotate, which in turn drives the transmission belt 9 to rotate. The operator places the sample holder 2, with the sample already placed, onto the detection rack 1. The sample holder 2 slides in the sliding groove 7 and is engaged between two adjacent moving plates 11. The transmission belt 9 moves, driving the moving plates 11 to move, which in turn pushes the sample holder 2, thus pushing the sample holder 2 from the end of the detection rack 1 to the inner wall for reagent titration and stirring. When the sample holder 2 moves below the burette 5, the burette 5 moves down to the port of the sample tube 3 for reagent titration. Subsequently, the sample holder 2 continues to move to the stirring device 6. The stirring device 6 thoroughly stirs the mixed liquid in the sample tube 3, thereby reducing the possibility of solution splashing during sample heating and digestion, thus improving detection accuracy and operator safety.

[0037] like Figure 3 As shown, a support block 12 is fixedly welded between the two side walls of the test rack 1. The support block 12 has a T-shape, and an electric actuator 13 is fixedly welded to it. A support frame 14 is fixedly welded to the bottom end of the electric actuator 13. Multiple burettes 5 are fixedly placed on the support frame 14. In this application, the number of burettes 5 is the same as the number of sample tubes 3 that can be placed on the sample rack 2, both being four. When the sample rack 2 moves to below the burettes 5 under the push of the moving plate 11 and the transmission belt 9, the transmission belt 9 stops rotating, the electric actuator 13 starts, and drives the burettes 5 towards the sample tubes 3 to their ports for reagent titration.

[0038] like Figure 4 and Figure 5 As shown, the stirring device 6 includes a sliding rod 15, which is rectangular in shape. Four stirring rods 16 are rotatably mounted on the lower end face of the sliding rod 15. A sealing cap 17 is connected to the stirring rod 16. The sealing cap 17 is cylindrical, and the stirring rods 16 are rotatably connected to the central axis of the sealing cap 17. A rubber gasket 18 is fixedly adhered to the lower end face of the sealing cap 17. The rubber gasket 18 abuts against the port of the sample tube 3, which can seal the sample tube 3. When the stirring rods 16 are stirring, it can reduce the splashing of liquid in the sample tube 3 out of the sample tube 3, thereby reducing the possibility of contamination and safety accidents. A rotating assembly 19 is provided on the sliding rod 15 to drive the stirring rods 16 to rotate, and a driving assembly 20 is provided on the detection frame 1 to drive the sliding rod 15 to move.

[0039] like Figure 4 and Figure 5As shown, the drive assembly 20 includes two lead screws 21 and two second motors 22. The detection frame 1 has drive grooves 23 on opposite side walls, which are arranged vertically. The two ends of the sliding rod 15 slide vertically within the drive grooves 23. The two lead screws 21 rotate within the two drive grooves 23, and the axis of the lead screws 21 is arranged vertically. The two second motors 22 are respectively installed at the top of the two side walls of the detection frame 1. The top ends of the two lead screws 21 are respectively fixedly welded to the two second motors 22. The two ends of the sliding rod 15 are respectively threaded to the two lead screws 21. The rotating assembly 19 includes a worm gear 24, a turbine 25, and a third motor 26. A placement groove 27 is provided inside the sliding rod 15. The placement groove 27 is arranged horizontally. The top end of the stirring rod 16 passes through and rotates on the inner wall of the placement groove 27. The turbine 25 is fixedly sleeved on the side wall of the top end of the stirring rod 16. The third motor 26 is fixedly installed in the placement groove 27. The worm gear 24 is fixedly welded to the rotating shaft of the third motor 26. The turbine 25 and the worm gear 24 mesh with each other. A rotating block 29 is fixedly welded on the stirring rod 16. The rotating block 29 is cylindrical. A rotating groove 28 is provided inside the sealing cover 17. The rotating block 29 rotates in the rotating groove 28. Multiple balls 30 are rotatably arranged on the inner wall of the rotating groove 28. The balls 30 are slidably connected to the rotating block 29.

[0040] like Figure 4 and Figure 5 As shown, when the sample tube 3 moves under the drive of the transmission belt 9 to below the stirring rod 16, the second motor 22 starts, which drives the lead screw 21 to rotate. The rotation of the lead screw 21 drives the sliding rod 15 to move, and the movement of the sliding rod 15 drives the stirring rod 16 to extend into the sample tube 3. When the rubber gasket 18 on the sealing cap 17 abuts against the port of the sample tube 3, the second motor 22 stops rotating, and the third motor 26 starts. The start of the third motor 26 drives the worm gear 24 to rotate, and the rotation of the worm gear 24 drives the turbine 25 to rotate. The rotation of the turbine 25 drives the stirring rod 16 to rotate, thereby stirring the mixture in the sample tube 3 to ensure thorough mixing. The sealing cap 17 can reduce the possibility of liquid splashing outside the sample tube 3 during stirring. When the stirring rod 16 rotates, it drives the rotating block 29 on it to rotate in the rotating groove 28. The ball bearing 30 reduces the friction between the rotating block 29 and the inner wall of the rotating groove 28, thereby reducing the possibility of the sealing cap 17 rotating with the stirring rod 16.

[0041] like Figure 4As shown, a water tank 31 is arranged between the test racks 1. The stirring rod 16 extends into the water tank 31. A drying port 32 is opened on the opposite side wall of the test rack 1, located above the water tank 31. A blower 33 is installed inside the test rack 1. One end of the blower 33 has a ventilation pipe connected to the drying port 32, and the other end has a ventilation pipe connected to the outside. After the stirring rod 16 finishes stirring in the sample tube, it moves away from the sample tube under the drive of the lead screw 21 and the second motor 22. After the sample tube 3 is removed, the stirring rod 16 extends into the water tank 31 for cleaning under the drive of the lead screw 21 and the second motor 22, thereby reducing cross-contamination and affecting the test results. When the stirring rod 16 is reset after being cleaned in the water tank 31, it passes through the drying port 32. The large amount of air blown out of the drying port 32 dries the moisture on the stirring rod 16, thereby reducing the impact on the test accuracy when it is stirred in the sample tube 3.

[0042] The implementation principle of this application embodiment is as follows: After the staff injects the water sample to be tested into the sample tube 3, it is placed on the sample rack 2. Under the action of the moving component 4, the sample rack 2 moves into the test rack 1 to the position of the burette 5. The burette 5 slides down to the port of the sample tube 3 for reagent titration. Subsequently, under the action of the moving component 4, the sample rack 2 continues to move to the stirring device 6. The stirring device 6 fully stirs the mixed liquid in the sample tube 3, thereby reducing the possibility of solution splashing when the sample is heated and digested, thereby improving the detection accuracy and the safety factor of the staff.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A water quality chemical oxygen demand (COD) analyzer, characterized in that: The device includes a test rack (1), a sample rack (2), and a sample tube (3). The sample rack (2) slides within the test rack (1). The test rack (1) is equipped with a moving component (4) for driving the sample rack (2) to move. The sample tube contains a sample to be tested. The sample tube (3) is placed within the sample rack (2). The test rack (1) is equipped with a burette (5) for titrating reagents and a stirring device (6) for stirring the mixed reagents in the sample tube (3).

2. The water quality chemical oxygen demand analyzer according to claim 1, characterized in that: The detection frame (1) has sliding grooves (7) on both sides of its side walls. Rollers (8) are rotatably connected to both ends of the sliding grooves (7). The moving components (4) are provided in two sets and are respectively located in the two sliding grooves (7). The moving components (4) include a transmission belt (9), a first motor (10), and multiple moving plates (11). The two ends of the transmission belt (9) are respectively wound around the two rollers (8). The first motor (10) is fixedly installed on the side wall of the detection frame (1) and fixedly connected to one of the rollers (8). The multiple moving plates (11) are fixedly connected to the transmission belt (9). The two ends of the sample holder (2) slide in the sliding grooves (7) at both ends of the detection frame (1) and are inserted between two adjacent moving plates (11).

3. The water quality chemical oxygen demand analyzer according to claim 1, characterized in that: A support block (12) is fixedly connected to the testing frame (1), an electric push rod (13) is fixedly connected to the support block (12), a support frame (14) is fixedly connected to one end of the electric push rod (13), and the burette (5) is connected to the support frame (14).

4. The water quality chemical oxygen demand analyzer according to claim 1, characterized in that: The stirring device (6) includes a sliding rod (15), on which a stirring rod (16) is rotatably mounted. A sealing cap (17) is connected to the stirring rod (16), and a rubber pad (18) is fixedly mounted on the sealing cap (17). The rubber pad (18) abuts against the port of the sample tube (3). A rotating component (19) for driving the stirring rod (16) to rotate is provided on the sliding rod (15), and a driving component (20) for driving the sliding rod (15) to move is provided on the detection frame (1).

5. The water quality chemical oxygen demand analyzer according to claim 4, characterized in that: The drive assembly (20) includes two lead screws (21) and two second motors (22). The detection frame (1) has drive grooves (23) on opposite side walls. The two ends of the sliding rod (15) slide in the drive grooves (23) respectively. The two lead screws (21) rotate in the two drive grooves (23) respectively. The two second motors (22) are respectively installed on the two side walls of the detection frame (1). The two lead screws (21) are respectively fixedly connected to the two second motors (22). The two ends of the sliding rod (15) are respectively threaded to the two lead screws (21).

6. The water quality chemical oxygen demand analyzer according to claim 4, characterized in that: The rotating assembly (19) includes a worm (24), a turbine (25), and a third motor (26). The sliding rod (15) has a placement groove (27) inside. The stirring rod (16) passes through and rotates on the inner wall of the placement groove (27). The turbine (25) is fixedly sleeved on the stirring rod (16). The third motor (26) is installed in the placement groove (27). The worm (24) is fixedly connected to the rotating shaft of the third motor (26). The turbine (25) and the worm (24) mesh with each other. A rotating block (29) is fixedly connected to the stirring rod (16), and a rotating groove (28) is provided in the sealing cover (17). The rotating block (29) rotates in the rotating groove (28), and a plurality of balls (30) are rotatably arranged on the inner wall of the rotating groove (28). The balls (30) are slidably connected to the rotating block (29).

7. The water quality chemical oxygen demand analyzer according to claim 4, characterized in that: A water tank (31) is provided between the testing racks (1), and the stirring rod (16) extends into the water tank (31).

8. The water quality chemical oxygen demand analyzer according to claim 7, characterized in that: The testing frame (1) has a drying port (32) on its opposite side wall. The drying port (32) is located above the water tank (31). A blower (33) is installed inside the testing frame (1). One end of the blower (33) is connected to the drying port (32), and the other end of the blower (33) is connected to the outside.

Images