Water quality chemical oxygen demand detection device

Abstract

The utility model discloses a water quality chemical oxygen demand detection device, which relates to the field of detection equipment, and adopts the technical scheme that the water quality chemical oxygen demand detection device comprises a sample unit for placing a sample cup; the heating unit can heat the sample cup; the stirring unit can be used for stirring the sample in the sample cup; the condensation unit comprises a plurality of condensation bottles, and the condensation bottles correspond to the sample cups; the injection unit can be used for injecting liquid for detection into the sample cup and the condensation bottle; and the detection unit can be used for detecting the sample in the sample cup. The device disclosed by the utility model has the beneficial effects that all functional mechanisms are integrated in the cabinet, so that the risk of reagent pollution is reduced, and the situation that a pipeline is too long to swing out a reagent and the like to occupy too much space is avoided; according to the scheme, reagent adding is achieved through the injection mechanism, a user does not need to manually transfer and weigh the reagent, direct contact with reagents such as sulfuric acid harmful to the human body in the experiment process is avoided, and the experiment process is safer and more convenient.

Description

Technical Field

[0001] The utility model relates to the field of detection equipment, and specifically relates to a water quality chemical oxygen demand detection device. Background Art

[0002] According to the experimental principle in the national standard, a known amount of potassium dichromate solution needs to be added to the water sample, and silver salt is used as a catalyst in a strong acid medium. After boiling and refluxing, ferroin is used as an indicator, and ammonium ferrous sulfate is used to titrate the potassium dichromate that has not been reduced in the water sample. The mass concentration of the consumed oxygen is calculated from the amount of potassium dichromate consumed. During the entire experimental process, there are more than a dozen types of reagents that need to be added manually, and the experimental process is very cumbersome; in the existing digestion devices and titration devices, the experimental steps are scattered and reagent and sample transfer need to be done manually. Usually, after manual liquid addition, the sample is put into the digestion device for digestion. After digestion is completed, it is manually transferred to the titration device. The effect of reducing the labor intensity of experimental personnel is very limited, and it is extremely easy to come into contact with harmful chemicals such as sulfuric acid and potassium dichromate during the transfer process, which also poses a certain harm to the physical health of the operators. Content of the Utility Model

[0003] Aiming at one of the deficiencies of the prior art, the utility model provides a water quality chemical oxygen demand detection device to solve the problem of automatic detection of water quality chemical oxygen demand.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A water quality chemical oxygen demand detection device, comprising:

[0005] A sample unit, including a plurality of sample cup placement positions for placing sample cups;

[0006] A heating unit, arranged below the sample unit, capable of heating the sample cup; the heating unit includes a heating element in a plate-like structure, and the heating element can heat the sample cup;

[0007] A stirring unit, arranged corresponding to the sample unit, capable of stirring the sample in the sample cup;

[0008] A condensing unit, arranged above the sample unit, including a plurality of condenser bottles, and the condenser bottles are arranged corresponding to the sample cups; the condensing unit further includes a condenser bottle guiding and clamping sleeve, the condenser bottle guiding and clamping sleeve is fixedly connected to the external structure, the condenser bottle is inserted into the condenser bottle guiding and clamping sleeve, and a spring is arranged at the connection between the condenser bottle and the condenser bottle guiding and clamping sleeve;

[0009] An injection unit, capable of injecting detection liquid into the sample cup and the condenser bottle;

[0010] A detection unit, capable of detecting the sample in the sample cup;

[0011] The lifting mechanism is linked to the heating element and can drive the heating element to rise or fall in the vertical direction. When the lifting mechanism rises, the heating element can push the sample cup to dock with the condensation bottle; and when the sample cup abuts against the condensation bottle upward, the spring applies a downward pressure to the condensation bottle.

[0012] Preferably, the sample unit includes:

[0013] A tray, on which the sample cup placement positions are provided. The sample cup placement positions are evenly distributed in a circular array; the sample cup placement positions are through holes opened on the tray, and the sample cup can be inserted into the sample cup placement positions, and the sample cup is slidably connected to the tray.

[0014] Preferably, the stirring unit includes:

[0015] A stirring mechanism, arranged below the heating element. The stirring mechanism is a magnetic stirring mechanism. The lifting mechanism is linked to the stirring mechanism and can drive the stirring mechanism to approach or move away from the sample cup.

[0016] Preferably, the bottom of the condensation bottle in the condensation mechanism corresponds to the mouth of the sample cup on the tray;

[0017] When the lifting mechanism drives the heating element to rise, the heating element can push the sample cup to move upward and sleeved on the outside of the bottom of the condensation bottle.

[0018] Preferably, the injection unit includes:

[0019] A first injection mechanism, arranged above the condensation mechanism. The first injection mechanism can inject experimental reagents into the sample cup along the inner wall of the condensation bottle;

[0020] A second injection mechanism, arranged corresponding to the sample cup, including a reagent bottle group composed of several reagent bottles. The second injection mechanism can inject detection reagents into the sample cup.

[0021] Preferably, the detection unit includes a camera and a color sensor, which can perform image acquisition and feedback on the sample in the sample cup.

[0022] Preferably, it further includes:

[0023] A cabinet, serving as the external housing structure of this detection device. There are provided on the cabinet,

[0024] A first opening, arranged corresponding to the tray;

[0025] A second opening, where the reagent bottle group is arranged;

[0026] A third opening, arranged at the lower part of the cabinet. A waste liquid bucket is arranged inside the third opening of the cabinet.

[0027] Preferably, the tray is slidably connected to the cabinet, and the tray can be drawn out from the first opening;

[0028] A heat insulation plate is arranged on the lower side of the heating element;

[0029] A heat dissipation fan is arranged on the side wall of the cabinet, and casters are arranged at the bottom of the cabinet.

[0030] Compared with the prior art, the following beneficial effects are achieved: The device integrates each functional mechanism in the cabinet, reducing the risk of reagent contamination and avoiding excessive space occupation caused by too long pipelines and external reagents; This solution realizes reagent addition through the injection mechanism, so that users no longer need to manually transfer and weigh reagents, avoiding direct contact with harmful reagents such as sulfuric acid during the experiment and making the experiment process safer and more convenient; By combining the lifting mechanism to drive the sample cup to lift, the sample does not need to be transferred during the whole experiment process, saving labor costs and avoiding various risks during the sample transfer process. Description of the Drawings

[0031] Figure 1 It is the front view of the embodiment of the present application;

[0032] Figure 2 It is the left view of the embodiment of the present application;

[0033] Figure 3 It is the right view of the embodiment of the present application;

[0034] Figure 4 It is the internal structure schematic diagram of the embodiment of the present application.

[0035] In the figure:

[0036] 100, cabinet; 101, first opening; 102, second opening; 103, third opening;

[0037] 1. First injection mechanism; 2. Upper waste liquid cup; 3. Condensing bottle guide sleeve; 4. Emergency stop button; 5. Condensing bottle; 6. Second injection mechanism; 7. Lower waste liquid cup; 8. Protective cover; 9. Sample cup; 10. Inductive switch; 11. Stirring mechanism; 12. Limit switch; 13. Caster; 14. Waste liquid barrel storage layer door; 15. Lifting mechanism; 16. Heat insulation plate; 17. Heating element; 18. Tray; 19. Reagent bottle; 20. Reagent bottle protection door; 21. Peristaltic pump; 22. Condensate inlet and outlet; 23. Heat dissipation fan. Detailed Embodiments

[0038] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0039] Please refer to Figures 1-4 , wherein Figure 4 is the front view perspective of the device, hiding most of the front cabinet door structure. The present application provides the following technical solutions:

[0040] A water quality chemical oxygen demand detection device includes a sample unit for placing samples. The sample unit includes a number of sample cup placement positions, and each sample cup placement position can place a sample cup 9. A heating unit is provided below the sample unit. The heating unit includes a heating element 17, and the sample cup 9 can be heated by the heating element 17. A stirring unit is also provided corresponding to the sample unit, and the stirring unit is used to stir the samples in the sample cup 9. A condensation unit is provided above the sample unit. The condensation unit includes a number of condensation bottles 5. The number of condensation bottles 5 is set corresponding to the sample cups 9, and the condensation bottles 5 can be docked with the sample cups 9 for use. The condensation unit further includes a condensation bottle guiding and clamping sleeve 3. The condensation bottle guiding and clamping sleeve 3 is fixedly connected to the inside of the cabinet 100. The condensation bottle 5 is inserted into the condensation bottle guiding and clamping sleeve 3, and a spring is provided at the connection between the condensation bottle 5 and the condensation bottle guiding and clamping sleeve 3. As an adding mechanism for water and reagents during the detection process, an injection unit is provided in this solution. The detection liquid can be injected into the sample cup 9 and the condensation bottle 5 through the injection unit. A detection unit is also provided in this solution. The samples in the sample cup 9 are detected by the detection unit, and the detection results are output. In addition, as the power function part inside the device, a lifting mechanism 15 is provided. The lifting mechanism 15 is linked with the heating element 17 and can drive the heating element 17 to rise or fall in the vertical direction. When the lifting mechanism 15 rises, the heating element 17 can push the sample cup 9 to dock with the condensation bottle 5. And when the sample cup 9 abuts against the condensation bottle 5 upward, the spring applies a downward pressure to the condensation bottle 5, so as to ensure the tight connection between the sample cup 9 and the condensation bottle 5.

[0041] Through the combined use of the above functional units, operations such as liquid addition, digestion, and titration in the water quality chemical oxygen demand detection process can be completed, integrating the experimental process into the cabinet 100, reducing the dependence on manual participation, thereby reducing labor costs and avoiding risks that may occur during the manual participation process.

[0042] On the basis of the above embodiments, the sample unit includes a tray 18. The tray 18 is a circular turntable, on which sample cup placement positions are provided. The sample cup placement positions are evenly arranged in a circumferential array. The sample cup placement positions are through holes opened on the tray 18. The sample cup 9 can be inserted into the sample cup placement positions, and the sample cup 9 is slidably connected to the tray 18.

[0043] On one side of the cabinet door of the cabinet 100, a first opening 101 is provided. The first opening 101 corresponds to the tray 18. The tray 18 and the cabinet adopt a pull-out connection structure, and it is sufficient that the tray 18 can be pulled out from the first opening 101. At the same time, the staff can also place and remove the sample cup 9 through the first opening 101, and can also directly rotate the tray 18 manually at the first opening 101.

[0044] On the basis of the above embodiments, the heating element 17 is in a plate-like structure, and it is sufficient that the heating element 17 can be electrically heated. In this solution, a microcrystalline heating plate is selected as the heating element 17. The heating element 17 is arranged below the tray 18 and can heat the bottom of the sample cup 9.

[0045] In the aspect of heating digestion, a microcrystalline glass graphene heating plate is used as the heating element 17, which has the advantage of uniform heating. As a further solution, the heating element 17 can be divided into four regions for independent control. When the sample is small, zoning control of digestion can greatly reduce the power consumption.

[0046] On the basis of the above embodiments, a lifting mechanism 15 is provided in this solution. The lifting mechanism 15 is linked with the heating element 17 and can drive the heating element 17 to rise or fall in the vertical direction.

[0047] The lifting mechanism 15 can select existing driving forms of linear motion, including electric, pneumatic or hydraulic push rods, etc. As a preferred structure suitable for this solution, a screw-driven lifting structure is selected in this solution. The screw-driven lifting structure has a more stable movement process and higher control accuracy for the lifting height, and is more suitable for use as a sample position moving mechanism in the detection device.

[0048] On the basis of the above embodiments, the stirring unit includes a stirring mechanism 11. The stirring mechanism 11 is arranged below the heating element 17. The stirring mechanism 11 is a magnetic stirring mechanism. The stirring mechanism 11 is also linked with the lifting mechanism 15, and the lifting mechanism 15 can drive the stirring mechanism 11 to rise close to the bottom of the sample cup 9.

[0049] When sample stirring is required, a magnetic stir bar is placed in the corresponding sample cup 9, and the stirring mechanism 11 drives the magnetic stir bar in the sample cup 9 to rotate through magnetic force, thereby realizing sample stirring. For the matching problem of the lifting mechanism 15 of the stirring mechanism 11, an independent lifting mechanism 15 can be set for the stirring mechanism 11 for adaptation, or a group of lifting mechanisms 15 can be shared with the heating element 17.

[0050] On the basis of the above embodiments, the bottom of the condensation bottle 5 in the condensation mechanism corresponds to the mouth of the sample cup 9 on the tray 18; when the lifting mechanism 15 drives the heating element 17 to rise, the heating element 17 can push the sample cup 9 upward and sleeved on the outer side of the bottom of the condensation bottle 15. The condensation bottle 5 can be adapted to the existing condensation bottle structure.

[0051] A condensation bottle guiding and sleeving structure 3 is arranged at the upper part of the cabinet 100 as the bearing structure of the condensation bottle 5. The guiding and sleeving structure 3 only needs to ensure that the condensation bottle 5 can be installed on it. In addition, it is necessary to ensure that the condensation bottle 5 corresponds one by one to the sample cup 9 on the lower tray 18.

[0052] A spring is arranged between the guiding and sleeving structure 3 and the condensation bottle 5. When the sample cup 9 moves upward, the spring applies a downward pressure to the condensation bottle 5 to ensure a tight connection between the condensation bottle 5 and the sample cup 9.

[0053] On the basis of the above embodiments, the injection unit has two injection mechanisms. The first injection mechanism 1 is located at the upper position inside the cabinet 100 and is arranged above the condensation mechanism. The first injection mechanism can inject experimental reagents into the sample cup along the inner wall of the condensation bottle; the first injection mechanism 1 is a swing arm structure with a liquid path inside and can rotate towards the direction of the condensation bottle 5. The external condensed water supply path is directly connected to the condensed water inlet and outlet nozzle on the body of the internal condensation bottle through the condensed water inlet and outlet 22 reserved on the outer side of the cabinet 100.

[0054] The second injection mechanism 6 is arranged corresponding to the sample cup 9 and is located in the middle area inside the cabinet 100. It also selects a swing arm structure with a liquid path inside. The second injection mechanism 6 forms a reagent liquid path supply path with the reagent bottle group. The reagent bottle group includes several reagent bottles 19 according to requirements, and different reagent bottles 19 are filled with different experimental reagents. The detection reagents can be injected into the sample cup 9 through the second injection mechanism 6. A peristaltic pump 21 is arranged corresponding to the first injection mechanism 1 and the second injection mechanism 6. The peristaltic pump 21 is used to discharge the waste liquid in the pipeline and is connected to the bottom of the waste liquid cup. The first injection mechanism 1 and the second injection mechanism 6 are connected to several injection pumps, plunger pumps and water pumps inside the cabinet 100 to supply liquid as needed. The first injection mechanism 1 is also provided with other pipelines communicating with the reagent bottle group.

[0055] A second opening 102 is opened on the side of the cabinet 100. The reagent bottle group is arranged at the second opening 102, and a reagent bottle protection door 20 is arranged at the second opening 102. The reagent bottle protection door 20 can select a magnetic adsorption door structure.

[0056] Based on the above embodiments, considering that there may be residual waste liquid in the first injection mechanism 1 and the second injection mechanism 6, a waste liquid recovery mechanism is correspondingly provided, namely the upper waste liquid cup 2 disposed below the first injection mechanism 1 and the lower waste liquid cup 7 disposed below the second injection mechanism 6.

[0057] A chamber is provided in the lower part of the cabinet 100, and a waste liquid bucket is placed in the chamber. The liquid in the waste liquid recovery mechanism is collected into the waste liquid bucket through pipelines. One or more waste liquid buckets can be provided according to actual needs. On one side of the cabinet door of the cabinet 100, a third opening 103 is provided corresponding to the waste liquid bucket, and a waste liquid bucket storage layer door 14 is provided at the third opening 103.

[0058] Based on the above embodiments, the detection unit includes a camera and a color sensor. The camera and the color sensor are disposed below the second injection mechanism 6 and are oriented towards the sample cup 9, capable of collecting images of the sample in the sample cup 9 and feeding back the color change of the sample. A protective cover 8 is further provided outside the camera and the color sensor for protection.

[0059] Based on the above embodiments, as a further supplementary solution, a heat insulation plate 16 is provided on the lower side of the heating element 17; thereby reducing the influence of the heating element 17 on the lower mechanism.

[0060] A heat dissipation fan 23 is provided on the side wall of the cabinet 100. According to actual needs, multiple heat dissipation fans 23 can be provided, such as Figure 3 Six heat dissipation fans 23 are provided and distributed in a rectangular array.

[0061] The bottom of the cabinet 100 is provided with casters 13, and the casters 13 can be selected as universal casters with a braking function.

[0062] Considering that the lifting mechanism 15 drives the heating element 17 to move in the vertical height, a limit switch 12 can be provided on the moving path of the heating element 17. The limit switch 12 is electrically connected to the motor of the lifting mechanism 15 to prevent the motor from over-running.

[0063] An emergency stop button 4 is preset on the outer side of the cabinet door of the cabinet 100 as an emergency stop button for the working state of the device in an emergency. An inductive switch 10 is provided at the cabinet door of the cabinet 100 to ensure feedback on whether the cabinet door is closed.

[0064] Based on the above embodiments, a working example of the device is given as follows:

[0065] 1. Automatic cleaning of the condensation bottle 5 and filling of each reagent pipeline:

[0066] A pure water bucket and a waste liquid bucket can be placed under the device. Ensure that the corresponding liquid suction pipe is placed in the corresponding bucket. The device will automatically reset when powered on. Place the sample cup 9 at the corresponding labeled position of the condenser bottle 5 to be used in the tray 18. Other cups can also be placed here, mainly used to hold cleaning water. Install the tray 18 into the instrument. Select the selected label to start the automatic cleaning process of the condenser bottle. The sample tray 18 rotates back to the origin position, and the lifting mechanism 15 is activated. The heating element 17 rises to the heating position. At this time, the heating element 17 pushes the sample cup 9 upward, so that the sample cup 9 placed in the tray 18 is docked with the mouth of the condenser bottle 5. The water for cleaning the condenser bottle 5 sprays out from the first injection mechanism 1 above the condenser bottle 5, flows through the inner wall of the entire condenser bottle 5, and then flows into the sample cup 9 placed on the tray 18. After the cleaning is completed, the lifting mechanism 15 is activated, and the heating element 17 descends back to the origin position. The sample cup 9 on the tray 18 is automatically separated from the condenser bottle 5. After the operation stops, the tray 18 can be taken out or the sample cup 9 for holding cleaning water can be taken out from the empty position; place the reagents to be used in the reagent bottle group at the second opening 102 on the side. Insert the liquid suction pipe into the reagent bottle 19. Select the filling of each reagent pipeline through the operation interface, and the peristaltic pump 21 works to automatically pump the reagent to fill the pipeline. The purpose of this process is to make the liquid addition amount in the experiment more accurate.

[0067] 2. Liquid addition and digestion process of the device:

[0068] Turn on the external chiller or other condensate water supply sources. Add the magnetic stirrer magnet and the sample to be measured into the sample cup 9. Place the sample cup 9 at the corresponding position of the selected tray 18, and then place the tray 18 into the cabinet 100. Start the operation, and the instrument will start to run automatically at this time. The tray 18 automatically rotates to the corresponding liquid addition position, and the swing arm of the second injection mechanism 6 rotates to the liquid addition position. The peristaltic pump 21 runs to add a specified amount of reagent into the sample cup 9. After all the reagents in the sample cups 9 are added, the sample tray 18 rotates back to the origin position. At this time, the lifting mechanism 15 is activated, and the heating element 17 partially rises to the heating position. The sample cup 9 is docked with the mouth of the condenser bottle 5. After the docking is completed, the swing arm of the first injection mechanism 1 rotates to add the reagent from the upper port of the condenser bottle 5. After the reagent is added, the heating element 17 starts to heat, and the reagent in the sample cup 9 starts to reflux and digest. When the digestion reaches the set time, the heating element 17 stops heating. After cooling for a certain time, the first injection mechanism 1 starts to rotate to add 45 ml of water from the upper end of the condenser bottle 5 to rinse the condenser bottle 5. After the rinsing is completed, the lifting mechanism 15 is activated to lower the heating part back to the origin to separate the sample cup 9 from the condenser bottle 5. After the separation is completed, the sample cup tray 18 rotates so that the bottom of the sample cup 9 is exactly corresponding to the installation position of the stirring motor 11. The heating element 17 moves to the stirring position, and the stirring motor 11 is turned on to drive the magnet in the cup to rotate and stir the reagent in the cup evenly. Turn on the cooling fan 23 to accelerate the cooling of the reagent in the sample cup 9 to room temperature.

[0069] 3. Titration process of the device:

[0070] When the reagent in the sample cup 9 has cooled to room temperature, the automatic titration starts. The tray 18 rotates the sample cup 9 to the liquid adding position in sequence, and the second injection mechanism 6 rotates to the liquid adding position. After automatically dropping a quantitative indicator, the magnetic stirring motor 11 is turned on, and the titration reagent is added drop by drop while stirring. The camera and color sensor below the lower liquid adding arm 6 can accurately observe the color change, automatically judge the titration end point, and at the same time, the amount of the titration reagent added drop by drop is displayed and recorded in real time. After the titration is completed, a test report is generated.

[0071] In the description of the present application and its embodiments, it should be understood that the orientation or positional relationship indicated by the terms "top", "bottom", "height", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0072] In the present application and its embodiments, unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0073] In the present application and its embodiments, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0074] The foregoing disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described above. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art can recognize the application of other processes and / or the use of other materials.

[0075] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments as well as all changes and modifications falling within the scope of the present application.

[0076] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these changes and modifications.

Claims

1. A water quality chemical oxygen demand detection device, characterized in that, Comprising: A sample unit, including a number of sample cup placement positions for placing sample cups; A heating unit, arranged below the sample unit, capable of heating the sample cups; the heating unit includes a heating element in the form of a plate structure, and the heating element can heat the sample cups; A stirring unit, arranged corresponding to the sample unit, capable of stirring the samples in the sample cups; A condensation unit, arranged above the sample unit, including a number of condensation bottles, with the condensation bottles arranged corresponding to the sample cups; the condensation unit further includes a condensation bottle guiding sleeve, which is fixedly connected to the external structure, the condensation bottle is inserted into the condensation bottle guiding sleeve, and a spring is arranged at the connection between the condensation bottle and the condensation bottle guiding sleeve; An injection unit, capable of injecting the liquid for detection into the sample cups and the condensation bottles; A detection unit, capable of detecting the samples in the sample cups; A lifting mechanism, linked with the heating element, capable of driving the heating element to rise or fall in the vertical direction. When the lifting mechanism rises, the heating element can push the sample cup to dock with the condensation bottle; and when the sample cup abuts against the condensation bottle upwards, the spring applies a downward pressure to the condensation bottle.

2. The water quality chemical oxygen demand detection device according to claim 1, characterized in that, The sample unit includes: A tray, on which the sample cup placement positions are arranged, and the sample cup placement positions are evenly distributed in a circumferential array; the sample cup placement positions are through holes opened on the tray, the sample cups can be inserted into the sample cup placement positions, and the sample cups are slidably connected to the tray.

3. The water quality chemical oxygen demand detection device according to claim 2, wherein, The stirring unit includes: A stirring mechanism, arranged below the heating element, the stirring mechanism is a magnetic stirring mechanism, and the lifting mechanism is linked with the stirring mechanism, capable of driving the stirring mechanism to approach or move away from the sample cup.

4. The water quality chemical oxygen demand detection device according to claim 3, characterized in that, The bottom of the condensation bottle in the condensation mechanism corresponds to the mouth of the sample cup on the tray; When the lifting mechanism drives the heating element to rise, the heating element can push the sample cup to move upwards and sleeved on the outer side of the bottom of the condensation bottle.

5. The water quality chemical oxygen demand detection device according to claim 4, characterized in that, The injection unit includes: A first injection mechanism, arranged above the condensation mechanism, and the first injection mechanism can inject the experimental reagent into the sample cup along the inner wall of the condensation bottle; A second injection mechanism, arranged corresponding to the sample cup, including a reagent bottle group composed of a number of reagent bottles, and the second injection mechanism can inject the detection reagent into the sample cup.

6. The water quality chemical oxygen demand detection device according to any one of claims 1-5, characterized in that, The detection unit includes a camera and a color sensor, capable of collecting images of and feeding back on the samples in the sample cups.

7. The water quality chemical oxygen demand detection device according to claim 6, wherein It further includes: A cabinet, serving as the external shell structure of this detection device, and the following are arranged on the cabinet A first opening, arranged corresponding to the tray; A second opening, where the reagent bottle group is arranged; A third opening, arranged at the lower part of the cabinet, and a waste liquid bucket is arranged inside the third opening of the cabinet.

8. The water quality chemical oxygen demand detection device according to claim 7, characterized in that, The tray is slidably connected to the cabinet, and the tray can be drawn out from the first opening.

9. The water quality chemical oxygen demand detection device according to any one of claims 1-5, characterized in that A heat insulation plate is arranged on the lower side of the heating element.

10. The water quality chemical oxygen demand detection device according to claim 7, characterized in that, Heat dissipation fans are arranged on the side walls of the cabinet, and casters are arranged at the bottom of the cabinet.

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