A fully automated biochemical oxygen demand analyzer

Abstract

This application relates to the field of water sample analysis equipment technology, and in particular to a fully automated biochemical oxygen demand (BOD) analyzer, comprising: two placement boxes with temperature control units; multiple placement plates, which are horizontally arranged and connected to the inner cavity of the placement boxes; multiple bottle holders, which are placed on the top wall of the placement plates; a sample processing control unit, forming a parameter processing control area; a sample dilution unit, forming a concentration dilution area; a bottle capping unit, forming a bottle cap placement area; an Oxygen Demand (OD) detection unit, forming an OD detection area; and two bottle holder moving units, which are connected to the placement boxes and can be connected to the bottle holders to move the bottle holders between the top wall of the placement plates and the parameter processing control area, the concentration dilution area, the bottle cap placement area, or the OD detection area. This application has the effect of reducing the workload of personnel in the process of biochemical oxygen demand (BOD) detection and ensuring the accuracy of the test results.

Description

Technical Field

[0001] This application relates to the field of water sample analysis equipment technology, and in particular to a fully automated biochemical oxygen demand analyzer. Background Technology

[0002] Biochemical oxygen demand (BOD) is the amount of dissolved oxygen required by aerobic microorganisms in water to decompose organic matter into inorganic matter within a specific time period at a certain temperature. It is a comprehensive indicator of the content of aerobic pollutants such as organic matter in water. The most commonly used standard is the five-day biochemical oxygen demand, which is determined by culturing a water sample for 5 days at a constant temperature of (20±1)℃ and measuring the concentration of dissolved oxygen in the water sample before and after culturing. The difference is the BOD5.

[0003] Currently, the most common methods for detecting organic matter in surface water and wastewater influent and effluent from wastewater treatment plants are routine surface water and wastewater treatment plant effluent. Because these methods are closely related to microorganisms, they are affected by many factors, including sample storage temperature, storage time, and the oxygen consumed by certain inorganic substances in the sample, such as sulfides and ferrous iron. This results in poor reproducibility. Furthermore, samples need to be adjusted to specific pH and conductivity values, and residual chlorine needs to be removed before measurement. The samples must also be stirred and shaken thoroughly. The dilution factor is determined based on TOC, permanganate index, or CODcr values. The entire pretreatment process requires repeated measurement of various parameters for each sample, leading to a huge workload. Additionally, samples need to be continuously cultured for five days, which is too long and prone to unexpected events that could interfere with or disrupt the continuity of sample culture. Therefore, to reduce the workload of personnel in biochemical oxygen demand (BOD) detection and ensure the accuracy of the results, there is an urgent need to develop and design a device capable of detecting BOD. Summary of the Invention

[0004] To reduce the workload of personnel in the biochemical oxygen demand (BOD) detection process and to ensure the accuracy of the test results, this application provides a fully automated BOD analyzer.

[0005] The fully automated biochemical oxygen demand analyzer provided in this application adopts the following technical solution:

[0006] A fully automated biochemical oxygen demand analyzer includes:

[0007] Two hollow placement boxes, each containing a temperature control unit;

[0008] Multiple placement plates are arranged horizontally and connected to the inner cavity of the placement box, and the multiple placement plates are distributed along the vertical direction;

[0009] Multiple bottle holders with receiving areas are placed on the top wall of the placement plate, and an insertion gap is formed between the bottle holders and the placement plate.

[0010] A sample processing control unit is installed on the placement box and forms a parameter processing control area inside the placement box;

[0011] A sample dilution unit is installed on the placement box and is used to quantitatively extract the original sample solution and diluent and inject them into the culture bottle. The sample dilution unit forms a concentration dilution zone within the placement box.

[0012] A bottle capping unit is installed on the placement box and forms a bottle cap taking and placing area inside the placement box;

[0013] An oxygen demand detection unit is installed on the placement box to form an oxygen demand detection area, and the oxygen demand detection area, concentration dilution area, and bottle cap placement area are located in the same cavity of the placement box.

[0014] Two bottle holder moving units are provided, which are connected to the placement box and can be connected to the bottle holder, for moving the bottle holder between the top wall of the placement plate and the parameter processing control area, concentration dilution area, bottle cap placement area, or oxygen demand detection area.

[0015] By employing the above technical solution, the sampled wastewater is poured into a sample bottle, which is then placed on the receiving area of ​​the bottle holder. The door of the placement box is closed, and the temperature inside the placement box is adjusted by a temperature control unit to maintain the temperature of the wastewater sample in the sample bottle at a specified value. Then, a bottle holder moving unit applies force to the bottle holder, causing the bottle holder to move the sample bottle to the parameter processing control area. This completes the measurement and adjustment of the pH value of the wastewater sample in the sample bottle, the measurement of conductivity, the stirring and aeration of the wastewater sample, and the measurement of the COD value of the wastewater sample to determine the required dilution factor. At this point, the bottle holder moving unit moves the sample to another... The bottle holders inside the placement box are subjected to force, causing the bottle holders to move the culture bottles to the concentration dilution zone. Then, based on the measured required dilution factor, a fixed amount of wastewater sample concentrate is extracted through the sample dilution unit, and simultaneously, a fixed amount of diluent is extracted and injected into the culture bottles in the concentration dilution zone, completing the wastewater sample dilution. After sample dilution is complete, the bottle holders are reset using the bottle holder moving unit, and then the bottle capping unit water-seals the bottle opening. After five days of constant temperature incubation, the bottle holder moving unit is used again to apply force to the bottle holders, causing the culture bottles to first move to the cap removal and placement area to open the bottle opening, and then move... Biochemical oxygen demand (BOD) is measured in the Oxygen Demand (BOD) detection area. The designed fully automated BOD analyzer utilizes a placement box to create a relatively closed experimental environment, reducing the impact of external factors on the accuracy of experimental results. A temperature control unit provides a constant temperature environment for pretreatment and subsequent culture of wastewater samples. Placement plates and bottle holders provide a stable storage area for sample bottles or culture flasks. The sample processing control unit enables pretreatment of wastewater samples, such as pH adjustment, conductivity measurement, agitation and aeration, followed by COD measurement to determine the required dilution factor. The system features a sample dilution unit for precise dilution of wastewater samples to achieve the desired dilution ratio, a bottle capping unit for opening and closing culture bottles, an oxygen demand (OD) detection unit for measuring biochemical oxygen demand (BOD), and a bottle holder movement unit for moving the bottle holder between the top wall of the placement plate and the parameter processing control area, concentration dilution area, cap placement area, or OD detection area. This movement of the bottle holder also facilitates the movement of sample bottles or culture bottles, thus automating the entire process of OD testing in wastewater samples. This reduces the workload of personnel during OD testing and ensures the accuracy of the results.

[0016] In one specific implementation, the sample processing control unit includes:

[0017] A rotating mounting plate is rotatably connected to the placement box, and the rotation axis of the rotating mounting plate is vertically set.

[0018] Multiple detection regulators are connected to the rotating mounting plate and are circumferentially distributed on the rotating mounting plate. The parameter processing and control area is located below the rotating mounting plate.

[0019] By adopting the above technical solution, the bottle holder moving unit drives the bottle holder to move the sample bottle or culture bottle to the parameter processing control area. By controlling the rotation of the rotating mounting plate, different detection regulators can be positioned directly opposite the sample bottle. Then, the pre-treatment of the wastewater sample in the sample bottle is performed in sequence, such as pH value detection and adjustment, conductivity measurement, stirring and aeration of the wastewater sample, and then the COD value of the wastewater sample is measured to determine the required dilution factor of the wastewater sample.

[0020] In one specific implementation scheme, a cleaning pipe is connected to the placement box, one end of the cleaning pipe is connected to a water supply end, and the detection regulator can come into contact with the water flow sprayed from the cleaning pipe after rotating with the rotating mounting plate.

[0021] By adopting the above technical solution, the designed cleaning tube can be cleaned after the wastewater sample in the sample bottle has been processed by the detection regulator, reducing the possibility of cross-contamination between different samples and improving the detection accuracy of the detection regulator.

[0022] In one specific implementation, the sample dilution unit includes:

[0023] At least one stock solution injection pump is connected to the placement box, and the inlet end of the stock solution injection pump forms a pumping area.

[0024] At least one diluent injection pump is connected to the placement box, and the outlet of the diluent injection pump and the outlet of the stock solution injection pump are in the same area, forming a concentration dilution zone.

[0025] By adopting the above technical solution, the designed sample dilution unit can move sewage samples from one placement box to another through the cooperation of the stock solution injection pump and the diluent injection pump, that is, move sewage samples from the sample bottle to the culture bottle without manual intervention. Moreover, it can accurately extract sewage samples and diluents quantitatively according to the dilution ratio, thereby improving the accuracy of biochemical oxygen demand detection.

[0026] In one specific implementation, there are multiple stock solution injection pumps, and the effective volumes of the multiple stock solution injection pumps are different.

[0027] By adopting the above technical solution, the required dilution factor of the wastewater sample is determined based on the COD value measured in the wastewater sample. When the dilution factor is large, such as exceeding 25 times, the accuracy of quantitative extraction of wastewater sample will have a significant impact on the biochemical oxygen demand detection results. Therefore, by setting up multiple stock solution injection pumps with different effective volumes, a small-volume stock solution injection pump can be used to extract wastewater samples when the dilution factor is large, thereby ensuring the accuracy of quantitative extraction of wastewater sample.

[0028] In one specific implementation, the bottle holder moving unit includes:

[0029] A movable bracket, wherein the movable bracket is capable of extending into the extension gap;

[0030] A three-axis drive mechanism is connected to the placement box and the movable bracket, for moving the movable bracket along three orthogonal axes.

[0031] By adopting the above technical solution, the designed bottle holder moving unit can easily enter the extension gap between the placement plate and the bottle holder through the moving bracket. The three-axis drive mechanism can realize the three-dimensional movement of the moving bracket in space, thereby realizing the positional movement of the bottle holder between the top wall of the placement plate and the parameter processing control area, concentration dilution area, bottle cap picking and placing area, and oxygen demand detection area.

[0032] In one specific implementation, the three-axis drive mechanism includes:

[0033] A lateral sliding block, which is slidably connected to the placement box;

[0034] A lateral drive component for driving the horizontal movement of the lateral sliding block, the lateral drive component being connected to the placement box and the lateral sliding block;

[0035] A vertical drive component is mounted on the horizontal sliding block, and a vertical sliding block is connected to the vertical drive component. The vertical drive component is used to move the vertical sliding block in the vertical direction.

[0036] A reciprocating pick-and-place component is mounted on the vertical sliding block and connected to the movable bracket, used to drive the movable bracket to move in a direction perpendicular to the horizontal and vertical sliding blocks.

[0037] By adopting the above technical solution, the designed three-axis drive mechanism can drive the horizontal sliding block to reciprocate in the horizontal direction through the horizontal drive component, drive the vertical sliding block to reciprocate in the vertical direction through the vertical drive component, and enable the moving bracket to move along the displacement plane perpendicular to the horizontal and vertical sliding blocks through the reciprocating pick-and-place component.

[0038] In one specific implementation, the bottle capping unit includes:

[0039] The opening and closing gripper is located in the inner cavity of the placement box, and the rotation axis of the opening and closing gripper is vertically arranged;

[0040] A rotating mechanism for driving the opening and closing gripper to rotate, the rotating mechanism being connected to the placement box and the opening and closing gripper.

[0041] By adopting the above technical solution, the designed bottle capping unit can clamp and release the water-sealed cap on the culture bottle through the opening and closing gripper, thereby cooperating with the rotating mechanism to realize the connection or separation between the water-sealed cap and the culture bottle.

[0042] In one specific implementation scheme, a replenishment tube is connected to the bottom wall of the placement plate, the replenishment tube has multiple drip ports, and the replenishment tube and the bottle cap placement area are located in the same cavity of the placement box.

[0043] By adopting the above technical solution, the designed replenishment tube can replenish the liquid at the water-sealed cap of the culture bottle during the culture process, thereby ensuring the sealing effect of the culture bottle.

[0044] In summary, this application includes at least one of the following beneficial technical effects:

[0045] 1. The designed fully automated biochemical oxygen demand (BOD) analyzer utilizes a placement box to facilitate a relatively closed experimental environment, reducing the impact of unexpected external factors on the accuracy of experimental results. Furthermore, a temperature control unit provides a constant temperature environment for pretreatment and subsequent culture of wastewater samples. Placement plates and bottle holders provide a stable storage area for sample bottles or culture flasks. The sample processing control unit enables pretreatment of wastewater samples, such as pH measurement and adjustment, conductivity measurement, agitation and aeration, followed by COD measurement to determine the required dilution factor. A sample dilution list is also provided. This system enables precise dilution of wastewater samples to achieve the desired dilution ratio. The bottle capping unit allows for the opening and closing of culture bottles, while the oxygen demand (OD) detection unit measures biochemical oxygen demand (BOD). The bottle holder moving unit allows the bottle holder to move between the top wall of the placement plate and the parameter processing control area, concentration dilution area, cap placement area, or OD detection area. The movement of the bottle holder also facilitates the movement of sample bottles or culture bottles, thus automating the entire process of biochemical oxygen demand (BOD) detection in wastewater samples. This reduces the workload of personnel during BOD detection and ensures the accuracy of the results.

[0046] 2. The designed fully automated biochemical oxygen demand (BOD) analyzer uses a bottle holder moving unit to move the sample bottle or culture bottle to the parameter processing control area. By controlling the rotation of the mounting plate, different detectors can be positioned directly opposite the sample bottle. Then, the system sequentially performs pretreatment of the wastewater sample in the sample bottle, such as pH value detection and adjustment, conductivity measurement, wastewater sample stirring and aeration, and finally measures the COD value of the wastewater sample to determine the required dilution factor.

[0047] 3. The designed fully automated biochemical oxygen demand (BOD) analyzer, through the combined use of a stock solution injection pump and a diluent injection pump, enables the movement of wastewater samples from one placement box to another, i.e., from the sample bottle to the culture bottle, without manual intervention. Based on the measured COD value of the wastewater sample, the required dilution factor is determined. When the dilution factor is large, such as exceeding 25 times, the accuracy of quantitative extraction of wastewater samples has a significant impact on the BOD detection results. Therefore, by setting up multiple stock solution injection pumps with different effective volumes, a small-volume stock solution injection pump can be used to extract wastewater samples when the dilution factor is large, thereby ensuring the accuracy of quantitative extraction of wastewater samples. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the overall structure of the fully automated biochemical oxygen demand analyzer according to an embodiment of this application.

[0049] Figure 2 yes Figure 1 The first part of the structure is shown in the diagram.

[0050] Figure 3 yes Figure 2 A bottom view after sectional view along the horizontal plane.

[0051] Figure 4 yes Figure 1 The second part is a side view after sectional view.

[0052] Figure 5 This is a cross-sectional view of the second placement box along the vertical plane in the embodiment of this application.

[0053] Figure 6 This is a bottom view of the second placement box in the embodiment of this application, after being sectionally viewed along the horizontal plane.

[0054] Figure 7 This is a cross-sectional view of the box along the vertical plane in an embodiment of this application.

[0055] Explanation of reference numerals in the attached drawings: 1. Placement box; 2. Placement plate; 3. Bottle holder; 4. Sample processing control unit; 41. Rotating mounting plate; 42. Detection regulator; 43. Cleaning tube; 5. Sample dilution unit; 51. Stock solution injection pump; 52. Diluent injection pump; 6. Bottle capping unit; 61. Opening and closing gripper; 62. Rotation mechanism; 7. Oxygen demand detection unit; 8. Bottle holder moving unit; 81. Moving bracket; 82. Three-axis drive mechanism; 821. Lateral sliding block; 822. Lateral drive component; 823. Vertical drive component; 824. Vertical sliding block; 825. Reciprocating pick-and-place component; 9. Replenishment tube. Detailed Implementation

[0056] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0057] This application discloses a fully automated biochemical oxygen demand analyzer.

[0058] Reference Figure 1 A fully automated biochemical oxygen demand (BOD) analyzer includes two placement boxes 1. Each placement box 1 is hollow and has a door rotatably connected to it, allowing the interior of the placement box 1 to be opened or closed. Four casters are bolted to the bottom wall of each placement box 1 to facilitate movement. Since the pretreatment and subsequent culture for BOD detection need to be carried out in a specific constant temperature environment, a temperature control unit is also provided inside the placement box 1. The temperature control unit can be an air conditioner or other temperature control equipment, as long as it can maintain a constant temperature inside the placement box 1. In this embodiment, the temperature control unit is an air conditioner. One of the two placement boxes 1 is used to place sample bottles, and the other is used to place culture bottles. For easy distinction, in this embodiment, the placement box 1 used to place sample bottles is the first placement box 1, and the placement box 1 used to place culture bottles is the second placement box 1.

[0059] Reference Figure 2 Furthermore, to facilitate full utilization of the space within the placement box 1 and improve the efficiency of biochemical oxygen demand (BOD) detection, multiple placement plates 2 and multiple bottle holders 3 are also included. The placement plates 2 are horizontally positioned and bolted to the placement box 1. The placement plates 2 are located within the inner cavity of the placement box 1, and multiple placement plates 2 are distributed along the vertical direction. Multiple receiving areas are formed on the bottle holders 3, and the shape of the receiving areas is adapted to the size and shape of the sample bottles or culture bottles. The bottle holders 3 are placed on the top wall of the placement plates 2, and an insertion gap is formed between the bottle holders 3 and the placement plates 2. In order to facilitate the positioning of the bottle holders 3 and reduce the possibility of relative displacement between the bottle holders 3 and the placement plates 2 when the placement box 1 is moved, multiple limiting grooves adapted to the column feet on the bottle holders 3 are formed inward on the placement plates 2.

[0060] Reference Figure 3Furthermore, after the wastewater sample obtained from sampling is placed into the sample bottle, it is necessary to perform pretreatment on the wastewater sample in a timely manner. Therefore, it also includes a sample processing control unit 4, which is installed on the first placement box 1 and forms a parameter processing control position in the first placement box 1.

[0061] Reference Figure 3 Specifically, the sample processing control unit 4 includes a rotating mounting plate 41 and multiple detection regulators 42. The rotating mounting plate 41 is rotatably connected to the first placement box 1 and is located within the inner cavity of the first placement box 1. The rotation axis of the rotating mounting plate 41 is vertically set. The detection regulators 42 are detachably and fixedly connected to the rotating mounting plate 41, such as by snap-fit ​​or bolt connection. Multiple detection regulators are evenly distributed circumferentially on the rotating mounting plate 41. The parameter processing control position is located below the rotating mounting plate 41. In this application, the number and type of detection regulators 42 can be determined according to the contamination... The pretreatment process for water samples dictates that, in this embodiment, after the sample bottle is moved to the parameter processing control area, it is necessary to complete the measurement and adjustment of the pH value of the wastewater sample in the sample bottle, the measurement of the conductivity, the stirring and aeration of the wastewater sample, and then measure the COD value of the wastewater sample to determine the required dilution factor of the wastewater sample. Therefore, there are four detection regulators 42, which are used to complete the measurement and adjustment of the pH value of the wastewater sample in the sample bottle, the measurement of the conductivity, the stirring and aeration of the wastewater sample, and the measurement of the COD value of the wastewater sample to determine the required dilution factor of the wastewater sample.

[0062] Reference Figure 3 To reduce the possibility of cross-contamination between two wastewater samples, which could affect the final detection accuracy, a cleaning pipe 43 is also connected to the placement box 1. One end of the cleaning pipe 43 is connected to an external water supply, thereby providing cleaning water to the cleaning pipe 43. After the detection regulator 42 rotates with the rotating mounting plate 41, it can be within the cleaning range of the cleaning pipe 43, that is, the water flow sprayed from the cleaning pipe 43 can contact the detection regulator 42, so that the detection regulator 42 is cleaned after it has completed the processing and detection of the current wastewater sample.

[0063] Reference Figure 4 Furthermore, after the wastewater sample pretreatment is completed, the wastewater sample needs to be diluted according to the required dilution factor and then transferred to a culture bottle for incubation. Therefore, a sample dilution unit 5 is also included. The sample dilution unit 5 is installed on the first placement box 1 or the second placement box 1 and is used to quantitatively extract the original sample solution and diluent and inject them into the culture bottle. The sample dilution unit 5 forms a concentration dilution zone in the second placement box 1.

[0064] Reference Figure 4Specifically, the sample dilution unit 5 includes at least one stock solution injection pump 51 and at least one diluent injection pump 52. The stock solution injection pump 51 can be bolted to either the first placement box 1 or the second placement box 1. It is sufficient that the stock solution injection pump 51 forms a liquid extraction area in the first placement box 1 and a liquid discharge area in the second placement box 1. The diluent injection pump 52 can be bolted to either the first placement box 1 or the second placement box 1. It is sufficient that the diluent injection pump 52 forms a liquid discharge area in the second placement box 1, and the liquid discharge areas formed by the stock solution injection pump 51 and the diluent injection pump 52 in the second placement box 1 overlap.

[0065] Reference Figure 4 There are multiple stock solution injection pumps 51 and diluent injection pumps 52, and the effective volumes of the multiple stock solution injection pumps 51 are different. In this embodiment, there are two stock solution injection pumps 51, one with an effective volume of 300 ml and the other with an effective volume of 10 ml. Furthermore, when culturing specific samples, auxiliary reagents such as inoculum or nitrification inhibitors need to be added. Therefore, an auxiliary reagent injection pump is bolted to the second placement box 1, and the auxiliary reagent injection pump forms an outlet area in the second placement box 1 that overlaps with the stock solution injection pump 51. Based on the COD value measured in the wastewater sample, the required dilution factor of the wastewater sample is determined. When the dilution factor is large, such as exceeding 25 times, the accuracy of quantitative extraction of wastewater sample will have a significant impact on the biochemical oxygen demand detection results. Therefore, by setting multiple stock solution injection pumps 51 with different effective volumes, a small-volume stock solution injection pump 51 can be used to extract wastewater samples when the dilution factor is large, thereby ensuring the accuracy of quantitative extraction of wastewater samples.

[0066] Reference Figure 5 After the wastewater sample is diluted and enters the culture bottle, it needs to be sealed and cultured. Therefore, it also includes a bottle capping unit 6. The bottle capping unit 6 is connected to the placement box 1, and the bottle capping unit 6 forms a bottle cap taking and putting area in the inner cavity of the second placement box 1.

[0067] Reference Figure 5 Specifically, the bottle capping unit 6 includes an opening and closing gripper 61 and a rotating mechanism 62. The opening and closing gripper 61 is located in the inner cavity of the second placement box 1, and the rotation axis of the opening and closing gripper 61 is vertically set. The opening and closing gripper 61 can realize the clamping or release of the water-sealed bottle cap. The rotating mechanism 62 is bolted to the second placement box 1 and is connected to the opening and closing gripper 61 to drive the opening and closing gripper 61 to rotate. In this application, the rotating mechanism 62 can be a rotary cylinder, a rotary motor, or other structures that can drive the opening and closing gripper 61 to rotate.

[0068] Reference Figure 5Furthermore, after the treated wastewater sample is cultured in a culture bottle for a specified time, it needs to be tested for biochemical oxygen demand. Therefore, it also includes an oxygen demand detection unit 7, which is installed on the second placement box 1 and forms an oxygen demand detection area in the second placement box 1. Specifically, the oxygen demand detection unit 7 is preferably an oxygen demand detection probe.

[0069] Reference Figure 6 Since the culture bottle uses a water-sealed cap, after the culture bottle is sealed by the opening and closing claw 61 and placed back on the placement plate 2 for static culture, in order to maintain the reliability of the water seal, an embedded groove is formed on the bottom wall of the placement plate 2, and a replenishment tube 9 is connected to the embedded groove by a snap fastener. The replenishment tube 9 is connected to the external water supply end, and multiple drip ports are opened along its own extension direction. The replenishment tube 9 is located in the inner cavity of the second placement box 1.

[0070] Reference Figure 5 and Figure 6 In order to enable the bottle holder 3 to move between the placement plate 2 and the liquid extraction / discharge area, bottle cap picking and placing area and oxygen demand detection area in the parameter processing control area and concentration dilution area, two bottle holder moving units 8 are also included. The two bottle holder moving units 8 are respectively connected to the first placement box 1 and the second placement box 1, and the bottle holder moving units 8 can be connected to the bottle holder 3.

[0071] Reference Figure 6 Specifically, the bottle holder moving unit 8 includes a moving bracket 81 and a three-axis drive mechanism 82. The moving bracket 81 can extend into the extension gap between the placement plate 2 and the bottle holder 3, and the top wall of the moving bracket 81 can abut against the bottom wall of the bottle holder 3. The three-axis drive mechanism 82 is connected to the placement box 1 and the moving bracket 81, and is used to move the moving bracket 81 along three orthogonal axes in the placement box 1, thereby moving the sample bottle or culture bottle through the bottle holder 3 to achieve position movement.

[0072] Reference Figure 6 and Figure 7Specifically, the three-axis drive mechanism 82 includes a transverse sliding block 821, a transverse drive member 822, a vertical sliding block 824, a vertical drive member 823, and a reciprocating pick-and-place member 825. A sliding rail is bolted to the inner wall of the placement box 1. The transverse sliding block 821 is slidably connected to the placement box 1 via the sliding rail. The transverse drive member 822 is connected to the placement box 1 and also to the transverse sliding block 821, used to drive the transverse sliding block 821 to slide horizontally. In this application, the transverse drive member 822 can be two transverse sliding blocks. The driving cylinder can also be other driving structures, such as the lateral driving component 822, which includes a lateral driving motor, two drive shafts and two drive belts. The lateral driving motor is bolted to the placement box 1. The axial directions of the two drive shafts are both vertically arranged and rotatably connected to the placement box 1. One of the drive shafts is coaxially keyed to the lateral driving motor, and pulleys are connected to both ends of the axial direction of the drive shaft. The two drive belts are respectively fitted onto two pulleys in the same horizontal area. The upper and lower ends of the lateral sliding block 821 are respectively connected to the two drive belts.

[0073] Reference Figure 7 The vertical drive component 823 is connected to the horizontal sliding block 821 and the vertical drive component 823 is connected to the vertical sliding block 824, which is used to make the vertical sliding block 824 move in the vertical direction. In this application, the vertical drive component 823 may include a vertical drive cylinder or other drive structures. In this embodiment, the vertical drive component 823 includes a vertical drive motor and a threaded rod. The vertical sliding block 824 is slidably connected to the horizontal sliding block 821. The vertical drive motor is bolted to the horizontal sliding block 821. The threaded rod is coaxially keyed to the output shaft of the vertical drive motor and passes through and is threadedly connected to the vertical sliding block 824.

[0074] Reference Figure 7 The reciprocating pick-and-place component 825 is mounted on the vertical sliding block 824 and is connected to the movable bracket 81. It is used to make the movable bracket 81 reciprocate in a direction perpendicular to the horizontal sliding block 821 and the vertical sliding block 824. Specifically, in this application, the reciprocating pick-and-place component 825 may include a reciprocating cylinder, a reciprocating telescopic rod, or other structures, as long as they can realize the reciprocating movement of the movable bracket 81.

[0075] The implementation principle of a fully automated biochemical oxygen demand (BOD) analyzer according to this application embodiment is as follows: Wastewater samples are poured into a sample bottle, which is then placed on the receiving area of ​​the bottle holder 3. The door of the placement box 1 is closed, and the temperature inside the placement box 1 is adjusted by the temperature control unit to maintain the temperature of the wastewater sample in the sample bottle at a specified value. Then, the bottle holder moving unit 8 applies force to the bottle holder 3, causing the bottle holder 3 to move the sample bottle to the parameter processing control area. This completes the measurement and adjustment of the pH value of the wastewater sample in the sample bottle, the measurement of conductivity, the stirring and aeration of the wastewater sample, and the measurement of the COD value of the wastewater sample to determine the required dilution factor. At this time, the bottle holder moving unit 8 moves the sample bottle to another... The bottle holder 3 inside the placement box 1 is forced to move the culture bottle to the concentration dilution zone. Then, based on the required dilution factor, a certain amount of wastewater sample stock solution is extracted through the sample dilution unit 5, and a certain amount of diluent is extracted and injected into the culture bottle in the concentration dilution zone to complete the dilution of the wastewater sample. After the sample dilution is completed, the culture bottle is reset by the bottle holder moving unit 8, and then the bottle capping unit 6 is used to water seal the bottle mouth. After five days of constant temperature incubation, the bottle holder moving unit 8 is used to force the bottle holder 3 again, so that the culture bottle is first moved to the bottle cap removal and placement area to open the bottle mouth, and then moved to the oxygen demand detection area for biochemical oxygen demand detection.

[0076] The placement box 1 facilitates the creation of a relatively closed experimental environment, reducing the impact of unexpected external factors on the accuracy of experimental results. Combined with the temperature control unit, it provides a constant temperature environment for the pretreatment and subsequent cultivation of wastewater samples. The placement plate 2 and bottle holder 3 provide a stable storage area for sample bottles or culture flasks. The sample processing control unit 4 enables pretreatment of wastewater samples, such as pH detection and adjustment, conductivity measurement, stirring and aeration, and then measuring the COD value to determine the required dilution factor. The sample dilution unit 5 allows for the dilution of wastewater samples... Precise dilution is achieved to obtain the ideal dilution ratio. The bottle capping unit 6 can open or close the bottle mouth. The oxygen demand detection unit 7 can detect biochemical oxygen demand. The bottle holder moving unit 8 can move the bottle holder 3 between the top wall of the placement plate 2 and the parameter processing control area, concentration dilution area, bottle cap placement area, or oxygen demand detection area. The movement of the bottle holder 3 can also move the sample bottle or culture bottle, thereby realizing the full-process automation of biochemical oxygen demand detection of wastewater samples, reducing the workload of personnel in the biochemical oxygen demand detection process, and ensuring the accuracy of the test results.

[0077] 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 fully automatic biochemical oxygen demand analyzer, characterized in that: The application relates to a sample processing device, which comprises: ​ two hollow placement boxes (1) provided with temperature control units; a plurality of placement plates (2) horizontally arranged in the inner cavities of the placement boxes (1) and distributed along the vertical direction; a plurality of bottle body brackets (3) provided with accommodating areas, which are placed on the top walls of the placement plates (2) and form extension gaps between the bottle body brackets (3) and the placement plates (2); a sample processing control unit (4) installed on the placement boxes (1) and forming a parameter processing control area in the placement boxes (1); a sample dilution unit (5) installed on the placement boxes (1) and used for quantitatively extracting sample stock solutions and dilution solutions and injecting the solutions into culture bottles, and the sample dilution unit (5) forms a concentration dilution area in the placement boxes (1); a bottle body sealing unit (6) installed on the placement boxes (1) and forming a bottle cap taking and placing area in the placement boxes (1); an oxygen demand detection unit (7) installed on the placement boxes (1) and forming an oxygen demand detection area, and the oxygen demand detection area, the concentration dilution area and the bottle cap taking and placing area are located in the same inner cavities of the placement boxes (1); two bottle support moving units (8) connected with the placement boxes (1) and capable of being connected with the bottle body brackets (3) to move the bottle body brackets (3) between the top walls of the placement plates (2) and the parameter processing control area, the concentration dilution area, the bottle cap taking and placing area or the oxygen demand detection area.

2. The fully automatic biochemical COD analyzer according to claim 1, characterized in that: The sample processing control unit (4) comprises: a rotating mounting disc (41) rotatably connected to the placement boxes (1), and the rotating axis of the rotating mounting disc (41) is vertically arranged; a plurality of detection adjusters (42) connected with the rotating mounting disc (41) and circumferentially distributed on the rotating mounting disc (41), and the parameter processing control area is located below the rotating mounting disc (41).

3. The fully automatic biochemical COD analyzer according to claim 2, characterized in that: A cleaning pipe (43) is connected to the placement boxes (1), one end of the cleaning pipe (43) is connected with a water supply end, and the detection adjusters (42) can be contacted with water flow sprayed by the cleaning pipe (43) after the rotating mounting disc (41) is rotated.

4. The fully automatic biochemical COD analyzer according to claim 1, characterized in that: The sample dilution unit (5) comprises: at least one stock solution injection pump (51) connected with the placement boxes (1), and the liquid inlet end of the stock solution injection pump (51) forms a liquid extraction area; at least one dilution solution injection pump (52) connected with the placement boxes (1), and the liquid outlet end of the dilution solution injection pump (52) and the liquid outlet end of the stock solution injection pump (51) are located in the same area and form a concentration dilution area.

5. The fully automatic biochemical COD analyzer according to claim 4, characterized in that: The number of the stock solution injection pumps (51) is multiple, and the effective volumes of the multiple stock solution injection pumps (51) are different.

6. The fully automatic biochemical COD analyzer according to claim 1, characterized in that: The bottle holder moving unit (8) comprises: A moving bracket (81) capable of extending into an extension gap; A three-axis driving mechanism (82) connected with the placing box (1) and connected with the moving bracket (81) for moving the moving bracket (81) along three orthogonal axes.

7. The fully automatic biochemical COD analyzer according to claim 6, characterized in that: The three-axis driving mechanism (82) comprises: A lateral sliding block (821) slidingly connected with the placing box (1); A lateral driving member (822) for driving the lateral sliding block (821) to move horizontally, the lateral driving member (822) being connected with the placing box (1) and connected with the lateral sliding block (821); A vertical driving member (823) installed on the lateral sliding block (821) and connected with a vertical sliding block (824) for moving the vertical sliding block (824) in a vertical direction; A reciprocating taking and placing member (825) installed on the vertical sliding block (824) and connected with the moving bracket (81) for driving the moving bracket (81) to move in a direction perpendicular to the lateral sliding block (821) and the vertical sliding block (824).

8. The fully automatic biochemical COD analyzer according to claim 1, characterized in that: The bottle body sealing unit (6) comprises: An opening and closing clamp jaw (61) located in the inner cavity of the placing box (1), and the rotation axis of the opening and closing clamp jaw (61) is vertically arranged; A rotating mechanism (62) for driving the opening and closing clamp jaw (61) to rotate, the rotating mechanism (62) being connected with the placing box (1) and connected with the opening and closing clamp jaw (61).

9. The fully automatic biochemical COD analyzer according to claim 8, characterized in that: A liquid supplement pipe (9) is connected to the bottom wall of the placing plate (2), a plurality of dripping openings are formed in the liquid supplement pipe (9), and the liquid supplement pipe (9) and the bottle cap taking and placing area are located in the same inner cavity of the placing box (1).

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