Full-automatic water quality chemical oxygen demand analyzer

Abstract

The utility model provides a kind of full-automatic water quality chemical oxygen demand analyzer, belong to the technical field of chemical analysis and detection, including fixed rack, digestion unit, liquid adding unit and moving unit, fixed rack includes frame body;Digestion unit includes multiple digestion furnace being arranged in the frame body mesa and the temperature control module corresponding with digestion furnace, temperature control module is used to control the temperature of digestion furnace;Liquid adding unit includes multi-channel switching valve, first liquid adding module, second liquid adding module and power component, second liquid adding module is connected with multi-channel switching valve, and power component is used to provide liquid adding power for first liquid adding module and second liquid adding module;Moving unit includes the mechanical arm connected to frame body and the gripper assembly connected to mechanical arm, gripper assembly includes two oppositely arranged clamping plates and the first pneumatic component connected to be arranged in two clamping plates, and first pneumatic component is used to drive two The clamping plate is mutually close or away from each other.The utility model improves work efficiency.

Description

Technical Field

[0001] This utility model belongs to the technical field of chemical analysis and detection, specifically relating to a fully automatic water quality chemical oxygen demand analyzer. Background Technology

[0002] Chemical oxygen demand (COD) is an indicator of the amount of reducing substances in water. These reducing substances include various organic compounds, nitrites, sulfides, ferrous salts, etc., but the main ones are organic compounds. Therefore, COD is often used as an indicator of the amount of organic matter in water. The higher the COD, the more serious the organic pollution of the water body.

[0003] Currently available fully automated water quality chemical oxygen demand (COD) analyzers can only be operated in a strict sequential manner, meaning digestion and detection must be performed sequentially. When testing large batches of samples, they cannot process multiple samples in parallel, resulting in a low processing capacity per unit time. Consequently, fully automated water quality COD analyzers suffer from low operating efficiency. Utility Model Content

[0004] This utility model provides a fully automatic water quality chemical oxygen demand analyzer, aiming to solve the technical problem of low working efficiency of fully automatic water quality chemical oxygen demand analyzers.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a fully automatic water quality chemical oxygen demand analyzer, comprising:

[0006] A mounting frame includes a frame body, a titration stage disposed on the frame body, and a sample basket for placing sample vials;

[0007] The digestion unit includes multiple digestion furnaces disposed on the frame platform and a temperature control module corresponding to each digestion furnace. The temperature control module is used to control the temperature of the digestion furnace.

[0008] A liquid dispensing unit includes a multi-channel switching valve, a first liquid dispensing module, a second liquid dispensing module, and a power unit. The second liquid dispensing module is connected to the multi-channel switching valve, and the power unit provides liquid dispensing power to the first and second liquid dispensing modules.

[0009] The moving unit includes a robotic arm connected to the frame and a gripper assembly connected to the robotic arm. The gripper assembly includes two opposing clamping plates and a first pneumatic component connected to the two clamping plates. The first pneumatic component extends and retracts along the line connecting the two clamping plates to drive the two clamping plates closer to or further apart from each other.

[0010] Preferably, the first liquid addition module includes:

[0011] A support tube, fixed to the table surface of the frame, has an open end located above the titration stage. A support plate is fixed to the open end of the support tube, and the support plate has multiple liquid outlet holes extending through it.

[0012] Multiple liquid filling tubes are provided, each corresponding to a liquid outlet. One end of each liquid filling tube extends into the support tube and is fixed to the inner wall of the liquid outlet.

[0013] Preferably, the first liquid addition module further includes:

[0014] Multiple blowing tubes, each corresponding to a filling tube, are fitted around the outer periphery of the filling tube, with the air outlet of the blowing tube extending to be fixedly connected to the inner wall of the liquid outlet hole; and

[0015] The second pneumatic component is connected to the liquid blowing pipe and is used to blow air into the liquid blowing pipe.

[0016] Preferably, the digestion furnace has multiple digestion stations, and the second liquid addition module includes:

[0017] A fixed bracket is slidably connected to the frame body;

[0018] A movable component, connected to the fixed bracket, is used to drive the fixed bracket to move in the vertical direction;

[0019] Multiple reflux pipes, each corresponding to a digestion station, are slidably connected to a fixed support, and each reflux pipe is connected to the multi-channel switching valve; and

[0020] An elastic element is disposed between the return pipe and the fixed bracket, and has a preload force that causes the return pipe to move downward.

[0021] Preferably, multiple return pipes are slidably connected to the fixed bracket, and multiple elastic elements are provided, with each elastic element corresponding to one of the return pipes.

[0022] Preferably, the outlet end of the reflux tube has a sealing part, the outer peripheral surface of which is spherical, and the sealing part is used for insertion and sealing with the sample bottle.

[0023] Preferably, the upper surface of the digestion furnace is provided with an upward moving unit corresponding to each digestion station, the upward moving unit comprising:

[0024] A fixing ring has a through-hole for the sample bottle to pass through, and a linkage groove is provided on the fixing ring to connect the outside world with the clamping groove. Multiple linkage grooves are provided around the central axis of the fixing ring.

[0025] A deformable element is disposed between the fixed ring and the digestion furnace, and has a preload force that causes the fixed ring to move downward;

[0026] A base is provided on the digestion furnace and has a through cavity in the vertical direction;

[0027] The third pneumatic component is connected to the passage cavity and blows or draws air into the passage cavity;

[0028] An upper moving rod is slidably disposed within the through cavity and extends into the linkage groove. A driving ring is provided circumferentially on the outer wall of the upper moving rod, and the driving ring has a driving inclined surface.

[0029] The clamping component has one end slidably connected to the inner wall of the linkage groove and has a force-bearing surface adapted to the driving inclined surface, and the other end is located in the clamping groove and adapted to the outer periphery of the sample bottle.

[0030] Preferably, the digestion furnace is slidably mounted on the platform of the frame, the digestion furnace slides in the vertical direction, the platform of the frame is provided with lifting members corresponding to the digestion furnace, the lifting members extend and retract in the vertical direction, and the extension and retraction ends of the lifting members are fixedly connected to the digestion furnace.

[0031] Preferably, the titration stage is slidably connected to the table surface of the frame, and the table surface of the frame is provided with a translation member, which is drivenly connected to the titration stage, and the translation member is used to drive the titration stage to move along a first direction.

[0032] Preferably, the bottom wall of the frame platform is provided with a fan corresponding to the sample basket.

[0033] The fully automated chemical oxygen demand (COD) analyzer for water quality provided by this invention, compared with existing technologies, features multiple independently temperature-controlled digestion furnaces and a flexibly movable gripper assembly. This allows the robotic arm to continue gripping the next batch of sample bottles to the digestion furnace during the digestion of the previous batch of samples, achieving parallel digestion and transfer of batches of samples and breaking through the limitations of sequential processing in traditional instruments. While the robotic arm transfers the digested samples to the titration stage, the second liquid addition module can directly inject acid solution into other sample bottles to be digested, realizing the spatiotemporal overlap of the "digestion-titration-transfer" process. The multi-channel liquid addition unit, in conjunction with the robotic arm, enables multiple steps to be performed simultaneously, significantly increasing the processing capacity per unit time and improving the working efficiency of the fully automated COD analyzer for water quality. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of the fully automatic water quality chemical oxygen demand analyzer according to an embodiment of this utility model;

[0035] Figure 2 for Figure 1 A magnified view of part A in the middle;

[0036] Figure 3This is a partial cross-sectional view of the first liquid addition module used in an embodiment of the present invention;

[0037] Figure 4 This is a partial schematic diagram of the second liquid addition module and the moving unit used in an embodiment of the present invention;

[0038] Figure 5 for Figure 4 A magnified view of part B in the middle section;

[0039] Figure 6 This is a schematic diagram of the upward moving unit used in an embodiment of the present utility model;

[0040] Figure 7 This is a partial cross-sectional view of the upward moving unit used in an embodiment of this utility model;

[0041] Figure 8 This is a schematic diagram of the fan and translation component used in an embodiment of the present invention.

[0042] Explanation of reference numerals in the attached figures:

[0043] 10. Frame; 101. Titration stage; 102. Sample basket; 103. Translation component; 104. Fan; 105. Lifting component;

[0044] 20. Digestion unit; 201. Digestion furnace;

[0045] 30. Liquid filling unit; 301. Support pipe; 3011. Support plate; 30111. Liquid outlet; 302. Liquid filling pipe; 303. Liquid blowing pipe; 304. Fixed bracket; 305. Moving part; 306. Return pipe; 3061. Sealing part; 307. Elastic part;

[0046] 40. Moving unit; 401. Clamping plate; 402. First pneumatic component; 403. X-axis synchronous belt module; 404. Y-axis rotary cylinder; 405. Z-axis vertical cylinder;

[0047] 50. Upward moving unit; 501. Fixing ring; 5011. Clamping groove; 5012. Linkage groove; 502. Base; 5021. Through cavity; 503. Upward moving rod; 5031. Drive ring; 504. Clamping component; 505. Deformation component; 506. Third power component. Detailed Implementation

[0048] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0049] Please refer to the following: Figures 1 to 8 This invention describes a fully automatic water quality chemical oxygen demand (COD) analyzer. The fully automatic water quality COD analyzer includes a fixed frame, a digestion unit 20, a liquid addition unit 30, and a moving unit 40. The fixed frame includes a frame body 10, a titration stage 101 disposed on the frame body 10, and a sample basket 102 for placing sample bottles. The digestion unit 20 includes multiple digestion furnaces 201 disposed on the surface of the frame body 10, and temperature control modules corresponding to each digestion furnace 201, the temperature control modules being used to control the temperature of the digestion furnaces 201. The liquid addition unit 30 includes a multi-channel switching valve, a first liquid addition module, and... The second liquid filling module and the power component are connected to the multi-channel switching valve. The power component is used to provide liquid filling power to the first liquid filling module and the second liquid filling module. The moving unit 40 includes a robotic arm connected to the frame 10 and a gripper assembly connected to the robotic arm. The gripper assembly includes two opposing clamping plates 401 and a first pneumatic component 402 connected to the two clamping plates 401. The first pneumatic component 402 extends and retracts along the line connecting the two clamping plates 401 to drive the two clamping plates 401 to move closer or further away from each other.

[0050] It should be noted that the fully automatic water quality chemical oxygen demand analyzer also includes a titration unit. During the process of adding chemical reagents to the sample bottle by the first liquid addition module, the titration unit collects the color of the solution in the sample bottle in real time. Once the color collected by the titration unit is the preset color, the first liquid addition module stops adding liquid, and the titration is completed.

[0051] Specifically, the robotic arm includes an X-axis synchronous belt module 403, a Y-axis rotary cylinder 404, and a Z-axis vertical cylinder 405, which realize the horizontal X-axis, rotational Y-axis, and vertical Z-axis movements of the gripper assembly. It should be noted that the first pneumatic component 402 is a finger cylinder. The cooperation between the robotic arm and the first pneumatic component 402 completes the gripping and transfer of sample bottles. The clamping plate 401 can grip multiple sample bottles at the same time, reducing sample transfer time, reducing the number of times the robotic arm operates, and reducing the failure rate of the equipment.

[0052] The fully automated water quality chemical oxygen demand analyzer provided in this embodiment, after placing a batch of sample bottles into the sample basket 102, the robotic arm moves the gripper assembly according to a preset program to pick up the sample bottles and place them into the digestion furnace 201. Then, acid solution is injected into the sample bottles. At the same time, the temperature control module of each digestion furnace 201 starts the heating program according to the time the sample bottles are placed in, so that the reagent in the sample bottles is heated to a slight boil and cooled by the condenser and refluxed into the sample bottle, thereby completing the digestion of the solution in the sample bottle. After digestion is completed, wait for the solution to return to room temperature, and at the same time, the second liquid addition module is rinsed with pure water. Then, the robotic arm starts to transfer the sample bottles to the sample basket 102 to return to room temperature. After the sample bottles return to room temperature, the robotic arm starts again to transfer the sample bottles to the titration stage 101. Then, the first liquid addition module injects indicator and titrant into the sample bottles, and at the same time, the mixed solution in the sample bottles is thoroughly stirred and titrated until the endpoint.

[0053] Compared with existing technologies, by setting up multiple independently temperature-controlled digestion furnaces 201 and flexibly movable gripper assemblies, the robotic arm can continue to grab the next batch of sample bottles to the digestion furnace 201 during the digestion of the previous batch of samples, realizing the parallel digestion and transfer of multiple samples and breaking through the limitations of sequential processing in traditional instruments. While the robotic arm transfers the digested samples to the titration stage 101, the second liquid addition module can directly inject acid solution into other sample bottles to be digested, realizing the spatiotemporal overlap of the "digestion-titration-transfer" process. The multi-channel liquid addition unit 30, in coordination with the robotic arm, enables multiple steps to be performed simultaneously, significantly increasing the processing capacity per unit time and improving the working efficiency of the fully automatic water quality chemical oxygen demand analyzer. After the first sample bottle is titrated, subsequent sample bottles are titrated every 3-5 minutes, greatly shortening the time required for batch titration.

[0054] See Figure 2 and Figure 3 The first liquid addition module includes a support tube 301 and multiple liquid addition tubes 302. The support tube 301 is fixed to the table surface of the frame 10. The support tube 301 has an open end located above the titration table 101. A support plate 3011 is fixed to the open end of the support tube 301. Multiple liquid outlet holes 30111 are opened through the support plate 3011. The multiple liquid addition tubes 302 correspond one-to-one with the liquid outlet holes 30111. One end of the liquid addition tube 302 extends into the support tube 301 and extends to be fixed to the inner wall of the liquid outlet hole 30111.

[0055] The first liquid filling module also includes multiple liquid blowing pipes 303 and a second pneumatic component. The multiple liquid blowing pipes 303 correspond one-to-one with the liquid filling pipes 302. The liquid blowing pipes 303 are sleeved on the outer periphery of the liquid filling pipes 302, and the air outlet end of the liquid blowing pipes 303 extends to be fixedly connected to the inner wall of the liquid outlet hole 30111. The second pneumatic component is connected to the liquid blowing pipes 303 and is used to blow air into the liquid blowing pipes 303.

[0056] Specifically, the second pneumatic component is an air pump.

[0057] It should be noted that one of the liquid filling pipes 302 is connected to the waste liquid tank, and the other liquid filling pipes 302 are connected to each chemical reagent bottle. There is no need to set up waste liquid bottles on the table of the frame 10, saving the space of the table of the frame 10. The power component is a peristaltic pump, and the power component corresponds one-to-one with the liquid filling pipe 302 to avoid cross-contamination of different chemical reagents.

[0058] Different dispensing tubes 302 connect to different chemical reagent bottles, enabling the directional delivery of various chemical agents. After dispensing, the second pneumatic component is activated to immediately purge any residual reagents, ensuring accurate dispensing volume. The sleeve design prevents gas from entering the dispensing tube 302, thus not affecting the liquid volume. If gas were injected into the dispensing tube 302, it would be necessary to refill the tube with liquid after each dispensing cycle before proceeding with the next dispensing cycle. The sleeve design avoids repeated pumping and dispensing, saving time.

[0059] See Figure 4 and Figure 5 The digestion furnace 201 has multiple digestion stations. The second liquid addition module includes a fixed support 304, a movable component 305, multiple return pipes 306, and an elastic component 307. The fixed support 304 is slidably connected to the frame 10. The movable component 305 is connected to the fixed support 304 and is used to drive the fixed support 304 to move in the up and down direction. The multiple return pipes 306 correspond one-to-one with the digestion stations. The return pipes 306 are slidably connected to the fixed support 304, and all multiple return pipes 306 are connected to a multi-channel switching valve. The elastic component 307 is located between the return pipes 306 and the fixed support 304 and has a pre-tightening force that causes the return pipes 306 to move downward.

[0060] Optional, see Figure 5 Multiple reflux tubes 306 are slidably connected to the fixed bracket 304. Multiple elastic elements 307 are provided, each corresponding to a reflux tube 306. Each elastic element 307 acts only on its corresponding reflux tube 306, allowing each tube to adaptively adjust its downward pressure according to the sample bottle position. This accommodates minor height differences between workstations, preventing sealing failures due to height deviations when multiple pipelines are linked, and ensuring consistent liquid filling sealing at each workstation.

[0061] Optionally, multiple reflux pipes 306 are slidably connected to the fixed bracket 304. One elastic element 307 is provided. If the pressure cannot be adaptively adjusted according to the position of the sample bottle, and there is a height difference between the various stations, it will lead to seal failure.

[0062] Specifically, the moving part 305 is a lifting linear module.

[0063] It should be noted that the reflux pipe 306 corresponds one-to-one with the power component. The outer periphery of the reflux pipe 306 is equipped with a condenser for cooling the volatile reagent. The reflux pipe 306 and the multi-channel switching valve can be connected by a hose.

[0064] The moving part 305 drives the fixed bracket 304 to descend as a whole, thereby causing the reflux tube 306 to descend until it is in contact with the sample bottle. The elastic part 307 can compensate for the height error between the reflux tube 306 and the sample bottle, ensuring the sealing between the reflux tube 306 and the sample bottle. The multi-channel reflux tube 306 distributes liquid through a multi-channel switching valve and a second delivery pipeline, which is convenient to operate and requires no manual intervention.

[0065] See Figure 5 The outlet end of the reflux tube 306 has a sealing part 3061. The outer peripheral surface of the sealing part 3061 is spherical. The sealing part 3061 is used to insert and seal with the sample bottle.

[0066] The sealing part 3061 forms a line contact seal with the bottle mouth under the action of the elastic member 307. The small contact area between the sealing part 3061 and the sample bottle makes it easy for the reflux tube 306 to detach from the sample bottle when it rises.

[0067] See Figure 6 and Figure 7 The upper surface of the digestion furnace 201 is provided with an upward moving unit 50 corresponding to each digestion station. The upward moving unit 50 includes a fixing ring 501, a base 502, a third pneumatic component 506, an upward moving rod 503, a clamping component 504, and a deformation component 505. The fixing ring 501 has a through clamping groove 5011 for the sample bottle to pass through. The fixing ring 501 also has a linkage groove 5012 that connects the outside world with the clamping groove 5011. Multiple linkage grooves 5012 are spaced around the central axis of the fixing ring 501. The deformation component 505 is located between the fixing ring 501 and the digestion furnace 201 and has the function of making the fixing ring 501... 501 is a pre-tightening force for downward movement; the base 502 is located in the digestion furnace 201 and has a through cavity 5021 in the vertical direction; the third pneumatic component 506 is connected to the through cavity 5021 and blows or sucks air into the through cavity 5021; the upper moving rod 503 is slidably located in the through cavity 5021 and extends into the linkage groove 5012, and the outer wall of the upper moving rod 503 is provided with a driving ring 5031 in the circumferential direction, and the driving ring 5031 has a driving inclined surface; one end of the clamping component 504 is slidably connected to the inner wall of the linkage groove 5012 and has a force-bearing surface adapted to the driving inclined surface, and the other end is located in the clamping groove 5011 and is adapted to the outer periphery of the sample bottle.

[0068] Specifically, the third pneumatic component 506 is an air pump, and the deformable component 505 is a spring rod.

[0069] The third pneumatic component 506 drives the upward moving rod 503 to move upward through the air pressure change in the passage cavity 5021. The upward moving rod 503, through the drive ring 5031, presses the force-bearing surface 5041 of the clamping component 504, thereby causing the clamping component 504 to move radially until it presses against the sample bottle. At this point, the elastic force of the deformation component 505 has not been overcome. The second starting component continues to pressurize, causing the upward moving rod 503 to continue moving upward until the elastic force of the deformation component 505 is overcome. Thus, the upward moving rod 503, through the drive ring 5031, drives the clamping component 504 and the fixing ring 501 to move upward, thereby moving the sample bottle upward. By adopting the method of moving the reflux tube 306 downward and the sample bottle upward, the sealing effect between the sample bottle and the reflux tube 306 is further improved.

[0070] See Figure 1 The digestion furnace 201 is slidably mounted on the platform of the frame 10. The digestion furnace 201 slides in the up and down direction. The platform of the frame 10 is provided with lifting members 105 corresponding to the digestion furnace 201. The lifting members 105 extend and retract in the up and down direction. The extension and retraction ends of the lifting members 105 are fixedly connected to the digestion furnace 201.

[0071] Specifically, the lifting component 105 can be a hydraulic cylinder.

[0072] When the sample vial is lifted, the lifting component 105 is activated simultaneously. The lifting component 105 drives the digestion furnace 201 to rise synchronously with the sample vial, thereby ensuring that the sample vial and the heating element of the digestion furnace 201 are always in contact, thus guaranteeing the heating effect on the sample vial.

[0073] See Figure 8 The titration stage 101 is slidably connected to the table surface of the frame 10. The table surface of the frame 10 is provided with a translation component 103, which is connected to the titration stage 101 in a transmission manner. The translation component 103 is used to drive the titration stage 101 to move along a first direction.

[0074] Specifically, the translation component 103 is a translation linear module.

[0075] It should be noted that, Figure 8 The direction indicated by the middle arrow is the first direction.

[0076] The movable titration stage 101 allows the main pipeline 301 to be precisely aligned with the sample bottle to be processed, reducing the travel distance of the robotic arm and optimizing the operation path. The movable titration stage 101 expands the working range of the liquid addition unit 30 and improves the efficiency of the robotic arm's gripping and liquid addition coordination.

[0077] See Figure 8 The bottom wall of the frame 10 is equipped with a fan 104 corresponding to the sample basket 102.

[0078] Fan 104 blows air to the bottom of sample basket 102, and the heat on the surface of the sample vial after digestion is carried away by forced convection, which quickly reduces the temperature to a safe operating temperature, reduces the time required for natural cooling, and improves the overall processing speed.

[0079] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fully automatic water quality chemical oxygen demand analyzer, characterized in that, include: A mounting frame includes a frame body, a titration stage disposed on the frame body, and a sample basket for placing sample vials; The digestion unit includes multiple digestion furnaces disposed on the frame platform and a temperature control module corresponding to each digestion furnace. The temperature control module is used to control the temperature of the digestion furnace. The liquid filling unit includes a multi-channel switching valve, a first liquid filling module, a second liquid filling module, and a power component. The second liquid filling module is connected to the multi-channel switching valve, and the power component is used to provide liquid filling power to the first liquid filling module and the second liquid filling module. as well as The moving unit includes a robotic arm connected to the frame and a gripper assembly connected to the robotic arm. The gripper assembly includes two opposing clamping plates and a first pneumatic component connected to the two clamping plates. The first pneumatic component extends and retracts along the line connecting the two clamping plates to drive the two clamping plates closer to or further apart from each other.

2. The fully automatic water quality chemical oxygen demand analyzer as described in claim 1, characterized in that, The first liquid addition module includes: A support tube, fixed to the table surface of the frame, has an open end located above the titration stage. A support plate is fixed to the open end of the support tube, and the support plate has multiple liquid outlet holes extending through it. Multiple liquid filling tubes are provided, each corresponding to a liquid outlet. One end of each liquid filling tube extends into the support tube and is fixed to the inner wall of the liquid outlet.

3. The fully automatic water quality chemical oxygen demand analyzer as described in claim 2, characterized in that, The first liquid addition module also includes: Multiple blowing tubes, each corresponding to a filling tube, are fitted around the outer periphery of the filling tube, with the air outlet of the blowing tube extending to be fixedly connected to the inner wall of the liquid outlet hole; and The second pneumatic component is connected to the liquid blowing pipe and is used to blow air into the liquid blowing pipe.

4. The fully automatic water quality chemical oxygen demand analyzer as described in claim 1, characterized in that, The digestion furnace has multiple digestion stations, and the second liquid addition module includes: A fixed bracket is slidably connected to the frame body; A movable component, connected to the fixed bracket, is used to drive the fixed bracket to move in the vertical direction; Multiple reflux pipes, each corresponding to a digestion station, are slidably connected to a fixed support, and each reflux pipe is connected to the multi-channel switching valve; and An elastic element is disposed between the return pipe and the fixed bracket, and has a preload force that causes the return pipe to move downward.

5. The fully automatic water quality chemical oxygen demand analyzer as described in claim 4, characterized in that, Multiple return pipes are slidably connected to the fixed bracket, and multiple elastic members are provided, with each elastic member corresponding to one of the return pipes.

6. The fully automatic water quality chemical oxygen demand analyzer as described in claim 4, characterized in that, The outlet end of the reflux tube has a sealing part, the outer peripheral surface of which is spherical, and the sealing part is used to insert and seal with the sample bottle.

7. The fully automatic water quality chemical oxygen demand analyzer as described in claim 4, characterized in that, The upper surface of the digestion furnace is provided with upward moving units corresponding to the digestion stations, and the upward moving unit includes: A fixing ring has a through-hole for the sample bottle to pass through, and a linkage groove is provided on the fixing ring to connect the outside world with the clamping groove. Multiple linkage grooves are provided around the central axis of the fixing ring. A deformable element is disposed between the fixed ring and the digestion furnace, and has a preload force that causes the fixed ring to move downward; A base is provided on the digestion furnace and has a through cavity in the vertical direction; The third pneumatic component is connected to the passage cavity and blows or draws air into the passage cavity; An upper moving rod is slidably disposed within the through cavity and extends into the linkage groove. A driving ring is provided circumferentially on the outer wall of the upper moving rod, and the driving ring has a driving inclined surface. The clamping component has one end slidably connected to the inner wall of the linkage groove and has a force-bearing surface adapted to the driving inclined surface, and the other end is located in the clamping groove and adapted to the outer periphery of the sample bottle.

8. The fully automatic water quality chemical oxygen demand analyzer as described in claim 7, characterized in that, The digestion furnace is slidably mounted on the platform of the frame. The digestion furnace slides in the vertical direction. The platform of the frame is provided with lifting members that correspond one-to-one with the digestion furnace. The lifting members extend and retract in the vertical direction, and the extension and retraction ends of the lifting members are fixedly connected to the digestion furnace.

9. The fully automatic water quality chemical oxygen demand analyzer as described in claim 1, characterized in that, The titration stage is slidably connected to the table surface of the frame. The table surface of the frame is provided with a translation component, which is drivenly connected to the titration stage. The translation component is used to drive the titration stage to move along a first direction.

10. The fully automatic water quality chemical oxygen demand analyzer as described in claim 1, characterized in that, The bottom wall of the frame platform is equipped with a fan corresponding to the sample basket.

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