Water quality COD (Chemical Oxygen Demand) analysis device

Abstract

The invention discloses a water quality COD analysis device, and relates to the technical field of COD water quality detectors, the water quality COD analysis device comprises a COD water quality detector body, a calibration mechanism is arranged on the outer side of the COD water quality detector body, a wiping mechanism is arranged on the outer side of the COD water quality detector body, the calibration mechanism can detect a plurality of detection samples after sample water calibration equipment is utilized, and the wiping mechanism is arranged on the outer side of the COD water quality detector body. The wiping mechanism can wipe the surface of a test tube of a detection sample, the calibration mechanism comprises a first stepping motor, the outer surface of the first stepping motor is fixedly connected to the inner wall of the COD water quality detector body, the output end of the first stepping motor is fixedly connected with a turntable, and the outer surface of the turntable is fixedly connected with a plurality of same rectangular frames; the inner wall of each rectangular frame is rotationally connected with a rubber barrel, stains and water stains on the surface of the test tube of the detection sample can be cleaned by utilizing the wiping rings, and the problem that the detection efficiency is reduced due to the fact that the test tube of the sample to be detected needs to be manually wiped before detection is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water quality detection, and in particular to a water quality COD analysis device. BACKGROUND

[0002] Water quality chemical oxygen demand (COD) analysis is used to evaluate the content of organic pollutants in water bodies, thereby providing a scientific basis for water quality management. Existing water quality COD analysis devices usually use spectroscopy or electrochemistry for detection, by placing a sample test tube in the detection light path, measuring the COD value using ultraviolet-visible light or electrode reaction, to achieve rapid quantitative analysis. However, the existing device lacks coordination in the sample processing procedure, surface cleaning and positioning calibration process of the sample test tube, making it difficult to guarantee the continuity and reliability of the overall detection process.

[0003] In actual application, the sample processing mechanism of the existing water quality COD analysis device mainly uses mechanical transmission and friction positioning methods, such as using fixed grooves or rubber pads on the turntable to accommodate test tubes, and using a motor to achieve rotary conveying. However, when the sample test tube inevitably gets water stains or trace pollutants during transfer, the existing calibration mechanism is usually independent of the cleaning process, and only uses hydraulic or pneumatic push rods to press the standard sample water test tube into the detection hole for calibration. However, the pollutants remaining on the surface of the test tube can interfere with the light path transmission or electrode contact, causing calibration deviation to accumulate to the formal detection stage. At the same time, the positioning accuracy of the turntable is limited by friction and mechanical clearance, and the test tube is prone to slight deviation when rotating and switching, further amplifying the interference effect of the pollutants. The synchronization and coordination of sample surface cleaning and positioning calibration are poor, and the interference of pollutants on the measurement accuracy cannot be effectively eliminated in continuous multiple batches of detection. For example, the amplification of calibration error causes the COD measurement value to be too high or too low, thereby misleading water quality evaluation decisions.

[0004] Therefore, there is an urgent need for a device that can realize real-time wiping of the sample surface and automatic calibration coordination to solve the above technical problems. SUMMARY

[0005] The purpose of the present application is to provide a water quality COD analysis device to solve the technical problem of the lack of coordination between the surface cleaning and positioning calibration process of the sample test tube in the sample processing procedure of the existing water quality COD analysis device.

[0006] To achieve this purpose, the following technical solutions are used in the present application: A water quality COD analysis device, comprising: A COD water quality detector body, a calibration mechanism is arranged on the outer side of the COD water quality detector body, and a wiping mechanism is arranged on the outer side of the COD water quality detector body. The calibration mechanism can calibrate the device with sample water, and then detect multiple detection samples. The wiping mechanism can wipe the surface of the test tube of the detection sample.

[0007] Further, the calibration mechanism comprises a first stepper motor, the outer surface of the first stepper motor is fixedly connected to the inner wall of the COD water quality detector body, the output end of the first stepper motor is fixedly connected with a rotating disc, the outer surface of the rotating disc is fixedly connected with a plurality of identical rectangular frames, the inner wall of each rectangular frame is rotatably connected with a rubber cylinder, one end of each of the plurality of rubber cylinders is fixedly connected with a butt cylinder, the upper surface of the COD water quality detector body is fixedly connected with two second stepper motors and a fixed plate respectively, the inner wall of the fixed plate is rotatably connected with two transmission shafts, one end of each transmission shaft is fixedly connected to the output end of the second stepper motor, the outer surface of each transmission shaft is slidably connected with a transmission cylinder, one end of each transmission cylinder is fixedly connected with a butt block, the inner wall of the fixed plate is fixedly connected with a hydraulic rod, the telescopic end of the hydraulic rod is fixedly connected with a moving plate, and the outer surface of each transmission cylinder is rotatably connected to the inner wall of the moving plate.

[0008] Further, the bottom surface of the moving plate is fixedly connected with two connecting blocks, the inner wall of each connecting block is fixedly connected with a bullseye bearing, and the outer surface of each bullseye bearing is in contact with the upper surface of the COD water quality detector body.

[0009] Further, the upper surface of the light shielding frame is hingedly connected with a movable door.

[0010] Further, the inner side wall of the light shielding frame is fixedly connected with a mounting frame, and the inner wall of the mounting frame is fixedly connected with a controller.

[0011] Further, the upper surface of the rotating disc is fixedly connected with a fixed cylinder, the inside of the fixed cylinder is clamped with a fixed block, and the top end of the fixed block is fixedly connected with a rotating plate.

[0012] Further, the upper surface of the rotating plate is provided with a plurality of identical sliding grooves, the inside of each sliding groove is slidably connected with a sliding block, and the upper surface of each sliding block is fixedly connected with a stress plate.

[0013] Further, one side surface of each sliding block is fixedly connected with a stress spring, one end of each stress spring is fixedly connected to the inner wall of the rotating plate, the other side surface of each sliding block is fixedly connected with a connecting shaft, and one end of each of the two connecting shafts is fixedly connected with a rubber block.

[0014] Further, one side of each rubber block is fixedly connected with two positioning shafts, and the outer surfaces of the positioning shafts are slidably connected to the inner part of the rotating plate.

[0015] Further, the wiping mechanism comprises a rotating gear, the outer surface of the rotating gear is rotatably connected to the inner wall of the COD water quality detector body, three groups of rectangular grooves are arranged on the upper surface of the rotating gear, the number of each group of rectangular grooves is two, a rectangular block is slidably connected to the inner part of each rectangular groove, the outer surfaces of the three groups of rectangular blocks are fixedly connected with a wiping ring, the inner side wall of the light shielding frame is fixedly connected with an extension rod, the extension end of the extension rod is fixedly connected with a transmission gear plate, and the outer surface of the transmission gear plate is engaged with the outer surface of the rotating gear.

[0016] Compared with the prior art, the application has the following beneficial effects: The water quality COD analysis device provided by the application adopts a first stepping motor to drive a rotating disc and a rubber cylinder in a rectangular frame on the outer surface thereof to fix a sample water test tube, utilizes the matching connection between the transmission shaft of a second stepping motor and a butt joint block, rotates a butt joint cylinder by pushing a moving plate through a hydraulic rod, and thereby presses the test tube into a detection hole for calibration, avoids the sliding interference of a transmission cylinder, and enables the power to be efficiently transmitted to the rubber cylinder to push the test tube to stably move downward to a detection position, thereby avoiding the mechanical clearance and deviation problems of the existing friction positioning mode; the wiping mechanism drives the transmission gear plate to engage with the rotating gear through the extension rod of the transmission assembly, and the wiping ring is linked to wipe the surface of the test tube in real time, completely removes water stains and trace pollutants, and prevents residual interference with light path transmission or electrode contact, thereby eliminating the cumulative effect of calibration deviation on the formal detection stage, avoiding the misleading of water quality evaluation decisions due to the high or low COD measurement value. In the continuous detection of multiple batches, the ninety-degree step switching of the rotating disc and the high friction force fixation of the rubber cylinder realize the automatic transfer and positioning of the sample test tube, and improve the detection efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0018] The structure, proportion, size and the like shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification, to be understood and read by those skilled in the art, and do not have technical significance to define the conditions for implementing the application. Any modification of the structure, change of the proportion relationship or adjustment of the size, which does not affect the effect and purpose that can be achieved by the application, should still fall within the scope of the disclosed technical content.

[0019] Figure 1 The overall structure of the water quality COD analysis device is shown in the figure. Figure 2 The structure of the controller of the water quality COD analysis device is shown in the figure. Figure 3 The structure of the transmission tooth plate of the water quality COD analysis device is shown in the figure. Figure 4 The structure of the force spring of the water quality COD analysis device is shown in the figure. Figure 5 The structure of the telescopic rod of the water quality COD analysis device is shown in the figure. Figure 6 The structure of the first step motor of the water quality COD analysis device is shown in the figure. Figure 7 The structure of the second step motor of the water quality COD analysis device is shown in the figure.

[0020] Illustration: 1, COD water quality detector body; 2, calibration mechanism; 201, light shielding frame; 202, turntable; 203, rubber cylinder; 204, rectangular frame; 205, butt joint cylinder; 206, first step motor; 207, second step motor; 208, fixed plate; 209, transmission shaft; 210, hydraulic rod; 211, transmission cylinder; 212, moving plate; 213, butt joint block; 214, movable door; 3, wiping mechanism; 301, transmission tooth plate; 302, telescopic rod; 303, wiping ring; 304, rectangular block; 305, rotating gear; 306, rectangular groove; 4, rotating plate; 5, controller; 6, mounting frame; 7, fixed block; 8, fixed cylinder; 9, force plate; 10, sliding block; 11, sliding groove; 12, positioning shaft; 13, force spring; 14, rubber block; 15, connecting shaft; 16, connecting block; 17, eye bearing. DETAILED DESCRIPTION

[0021] In order to make the purposes, characteristics and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the following described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] In the description of the present application, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there can be a component disposed therebetween.

[0023] The technical solutions of the present application will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0024] In an embodiment, referring to Figures 1 to 6 A water quality COD analysis device, comprising a COD water quality detector body 1, a calibration mechanism 2 is arranged on the outer side of the COD water quality detector body 1, and a wiping mechanism 3 is arranged on the outer side of the COD water quality detector body 1; the calibration mechanism 2 can detect a plurality of detection samples after calibrating the equipment with sample water. As a further limitation of the calibration mechanism 2 of the present application, the calibration mechanism 2 comprises a first stepper motor 206, the outer surface of the first stepper motor 206 is fixedly connected to the inner wall of the COD water quality detector body 1, the output end of the first stepper motor 206 is fixedly connected with a turntable 202, the outer surface of the turntable 202 is fixedly connected with a plurality of identical rectangular frames 204, the inner wall of each rectangular frame 204 is rotatably connected with a rubber cylinder 203, one end of each of the plurality of rubber cylinders 203 is fixedly connected with a butt joint cylinder 205, the upper surface of the COD water quality detector body 1 is fixedly connected with two second stepper motors 207 and a fixed plate 208 respectively, the inner wall of the fixed plate 208 is rotatably connected with two transmission shafts 209, one end of each of the transmission shafts 209 is fixedly connected to the output end of the second stepper motor 207, the outer surface of each transmission shaft 209 is slidably connected with a transmission cylinder 211, one end of each transmission cylinder 211 is fixedly connected with a butt joint block 213, the inner wall of the fixed plate 208 is fixedly connected with a hydraulic rod 210, the telescopic end of the hydraulic rod 210 is fixedly connected with a moving plate 212, and the outer surface of each transmission cylinder 211 is rotatably connected to the inner wall of the moving plate 212.

[0025] In this embodiment, the detector body serves as a base, and a calibration mechanism 2 and a wiping mechanism 3 are disposed on the outer side of the detector body. These two mechanisms are tightly integrated with the detector body, forming a modular design. The calibration mechanism 2 is used to handle the positioning and rotation calibration of the sample water test tube, and the wiping mechanism 3 automatically cleans the surface of the test tube for the test sample. The calibration mechanism 2 includes a first stepper motor 206 and a second stepper motor 207 fixed to the main body of the detector. The output shaft of the first stepper motor 206 is fixed to the center of the turntable 202 via a keyway or flange. The turntable 202 serves as a rotating platform, with multiple rectangular frames 204 evenly distributed on its outer surface. These rectangular frames 204 are fixed to the turntable 202 by welding or snap-fitting to prevent offset during rotation. The inner wall of each rectangular frame 204 is rotatably connected to a rubber cylinder 203 via a built-in bearing, allowing the rubber cylinder 203 to rotate freely within the rectangular frame 204. The soft material of the rubber cylinder 203 provides cushioning friction against the test tubes, preventing breakage due to rigid impact during insertion. A docking cylinder 205 is fixedly connected to one end of the rubber cylinder 203, which can be secured by gluing or threading. The output end of the second stepper motor 207 is equipped with a drive shaft 209, one end of which is connected to a docking block 213, which matches the docking cylinder 205. The wiping mechanism 3 includes a transmission assembly and a wiping ring 303, used to wipe the surface of the test tube containing the sample. The transmission assembly includes a rotating gear 305, the outer surface of which is rotatably connected to the inner wall of the instrument body. It is installed in a reserved groove on the inner wall of the instrument body via a bushing or ball bearing. A rectangular groove 306 is formed on the upper surface of the rotating gear 305. A rectangular block 304 is slidably connected inside the rectangular groove 306. The wiping ring 303 is disposed on the outer surface of the rectangular block 304. The geometry of the rectangular block 304 prevents it from rotating in the groove, allowing it to slide in the vertical direction. The wiping ring 303 can be fixed to the outer surface of the rectangular block 304 through an annular groove. When the rectangular block 304 moves up and down, the wiping ring 303 follows suit and wipes the surface of the test tube. A telescopic rod 302 is fixedly connected to the inner wall of the light-shielding frame 201. A transmission gear plate 301 is fixedly connected to the telescopic end of the telescopic rod 302. The outer surface of the transmission gear plate 301 meshes with the outer surface of the rotating gear 305. The telescopic rod 302 can be in the form of a cylinder or an electric push rod. Its fixed end is welded to the inner wall of the light-shielding frame 201, and its telescopic end is connected to the transmission gear plate 301 by screws. The tooth profile of the transmission gear plate 301 meshes with the gear ring of the rotating gear 305. When the telescopic rod 302 pushes the transmission gear plate 301 to slide linearly, it drives the rotating gear 305 to rotate, thereby converting the linear power into a rotational wiping action.

[0026] In this embodiment, the detector body provides a closed detection environment. The calibration mechanism 2 achieves the pre-positioning and rotation insertion of the sample water tube into the detection hole through dual motor drive. The wiping mechanism 3 uses gear meshing and telescopic drive to remove surface water stains and dirt in real time during the movement of the test tube, making the optical path clear. For example, in actual operation, when the operator opens the movable door 214 and inserts the sample water test tube into the rubber cylinder 203 on the turntable 202, the inner wall of the rubber cylinder 203 grips the test tube tightly due to friction, preventing it from shaking when the turntable 202 rotates; the first stepper motor 206 drives the turntable 202 to rotate 90 degrees, moving the sample water test tube directly above; the second stepper motor 207, through the matching of the transmission shaft 209 and the docking block 213, pushes the rubber cylinder 203 to rotate and press the test tube down to the detection hole. At this time, the hydraulic rod 210 extends and retracts, causing the moving plate 212 and the bullseye bearing 17 to slide on the upper surface of the detector body, so that the relative sliding of the transmission cylinder 211 on the transmission shaft 209 does not interrupt the power transmission; the controller 5 activates the telescopic rod 302, pushing the transmission gear plate 301 to mesh with the rotating gear 305, and the rectangular block 304 slides to drive the wiping ring 303 to circle the surface of the test tube. After removing the attachments, the test tube enters the detection state.

[0027] In one scenario embodiment, the operator passes the sample water test tube through the rotating plate 4 (whose sliding groove 11 and force plate 9 are designed to allow the test tube to pass loosely) and inserts it into the rubber cylinder 203 outside the turntable 202; the flexible inner wall of the rubber cylinder 203 provides stable friction, keeping the test tube vertical; then, three test tubes are sequentially inserted into the rubber cylinders 203 of the remaining rectangular frames 204, and after closing the movable door 214, the system starts calibration. The first stepper motor 206 rotates the turntable 202 ninety degrees, placing the sample water test tube directly above the detector body; the second stepper motor 207 is activated, and the drive shaft 209 is inserted into the docking cylinder 205 through the drive cylinder 211 (whose inner wall cross groove matches the cross protrusion of the drive shaft 209 to prevent torque loss) and the docking block 213, driving the rubber cylinder 203 to rotate and press down, and the test tube smoothly enters the detection hole for spectral calibration. Simultaneously, the wiping mechanism 3 is activated: the telescopic rod 302 extends to push the transmission gear plate 301 to slide, the gear plate meshes with the rotating gear 305 to make it rotate, and the rectangular block 304 slides up and down in the rectangular groove 306, causing the wiping ring 303 to adhere to the outer wall of the test tube. The microfiber or sponge material of the wiping ring 303 adsorbs water droplets and particles during rotation. After calibration, the reverse rotating motor releases the test tube, and the turntable 202 rotates ninety degrees to process the next sample. After the test is completed, the operator pulls the force plate 9 (which is connected to the sliding block 10 through the force spring 13 and the connecting shaft 15, and the rubber block 14 provides additional fixing friction) to fix the rubber block 14 tightly against the surface of the test tube, and then pulls the rotating plate 4 upward to remove all the test tubes. This design facilitates batch processing.

[0028] In one embodiment, a fixing plate 208 is fixedly connected to the upper surface of the water quality analyzer body 1. The inner wall of the fixing plate 208 is rotatably connected to the transmission shaft 209. A transmission cylinder 211 is slidably connected to the outer surface of the transmission shaft 209. A docking block 213 is connected to one end of the transmission cylinder 211. A hydraulic rod 210 is connected to the inner wall of the fixing plate 208. A moving plate 212 is connected to the telescopic end of the hydraulic rod 210. The outer surface of the transmission cylinder 211 is rotatably connected to the inner wall of the moving plate 212.

[0029] In this embodiment, the fixing plate is connected to the upper surface of the detector body to provide a stable support structure, allowing the transmission shaft 209 to rotate smoothly on its inner wall, thereby avoiding accuracy loss due to vibration or offset during calibration. The outer surface of the transmission shaft 209 is slidably connected to the transmission cylinder 211, allowing the transmission cylinder 211 to slide freely on the shaft while maintaining the continuity of power transmission. One end of the transmission cylinder 211 is directly connected to the docking block 213, enabling it to match with the docking cylinder 205 of the calibration mechanism 2, realizing the rotation and positioning of the sample tube. The hydraulic rod 210 connected to the inner wall of the fixing plate 208 has its telescopic end connected to the moving plate 212. The telescopic movement of the hydraulic rod 210 can push the moving plate 212 to move in a fixed direction, thereby driving the overall displacement of the transmission cylinder 211 and the docking block 213. The inner wall of the moving plate 212 is rotatably connected to the outer surface of the transmission cylinder 211, allowing the transmission cylinder 211 to maintain relative rotational freedom during movement, avoiding jamming or dislocation. Through the synergistic effect of these structures, when the sample water test tube needs to be calibrated, the operator first controls the extension of the hydraulic rod 210. The extension end of the hydraulic rod 210 smoothly pushes the moving plate 212 downward. The moving plate 212 then drives the transmission cylinder 211 to slide along the transmission shaft 209 until the docking block 213 is fully embedded in the docking cylinder 205. At this time, the output power of the second stepper motor 207 is transmitted to the transmission cylinder 211 through the transmission shaft 209 and acts on the mating point of the docking block 213 and the docking cylinder 205, causing the rubber cylinder 203 to start rotating. If the initial position of the sample water test tube is slightly off, the extension and retraction of the hydraulic rod 210 can adjust the stroke of the moving plate 212, so that the docking block 213 is fully embedded in the docking cylinder 205. 3. The fitting depth between the rubber cylinder 203 and the docking cylinder 205 reaches an ideal state, so that the friction force of the rubber cylinder 203 is evenly applied to the surface of the test tube, avoiding calibration data deviation caused by shaking of the test tube during rotation. During this process, the sliding connection of the transmission cylinder 211 keeps the transmission shaft 209 stationary relative to the fixed plate 208, and the moving plate 212 maintains balance through this rotational connection, improving the repeatability and reliability of calibration. After calibration, the reverse retraction of the hydraulic rod 210 can return the moving plate 212 to its original position, and the transmission cylinder 211 slides away from the docking cylinder 205 to prepare for the rotation of the next sample, simplifying the operation steps and reducing mechanical wear, thus improving the durability of the device during long-term continuous use.

[0030] In one embodiment, two connecting blocks 16 are fixedly connected to the bottom surface of the movable plate 212. Each connecting block 16 has a bullseye bearing 17 fixedly connected to its inner wall. The outer surface of each bullseye bearing 17 is in contact with the upper surface of the COD water quality analyzer body 1.

[0031] In this embodiment, two connecting blocks 16 are fixedly connected to the bottom surface of the movable plate 212. Each connecting block 16 has a bullseye bearing 17 fixedly connected to its inner wall. Its outer surface is in contact with the upper surface of the water quality analyzer body 1. The spherical contact characteristics of the bullseye bearing 17 enable the connecting block 16 to make multi-directional fine adjustments when sliding on the bottom surface, reducing jamming or noise caused by uneven surfaces. The fixed connection of the connecting blocks 16 ensures the positional stability of the bullseye bearing 17. Its direct contact with the analyzer body forms a low-friction support surface, further reducing the energy consumption and resistance when the hydraulic rod 210 is driven. This allows the movable plate 212 to move like a slide rail during telescopic movement. At the same time, the wear-resistant material characteristics of the bullseye bearing 17 extend the service life of the components and avoid the need for frequent replacement maintenance. In actual operation, when the hydraulic rod 210 pushes the moving plate 212, the two connecting blocks 16 slide gently on the upper surface of the detector body through the bullseye bearing 17. For example, when calibrating the sample water test tube, if the upper surface of the detector body has slight bumps due to long-term use, the outer surface of the bullseye bearing 17 will automatically adapt to these changes, keeping the moving plate 212 in a horizontal position, so that the docking block 213 is accurately aligned with the docking cylinder 205, and the test tube will not rotate unevenly due to offset.

[0032] In one embodiment, a light-shielding frame 201 is fixedly connected to the upper surface of the water quality analyzer body 1, and a movable door 214 is movably hinged to the upper surface of the light-shielding frame 201.

[0033] In this embodiment, a light-shielding frame 201 is fixedly connected to the upper surface of the detector body 1, and a movable door 214 is movably hinged to its upper surface. The fixed connection of the light-shielding frame 201 makes it seamlessly integrated with the body, preventing light from seeping in from the side and affecting the sensitivity of COD spectral analysis. The hinge structure of the movable door 214 allows the operator to easily open and close it, and the internal turntable 202 and test tube position can be accessed by simply pulling it. The durable design of the hinge point prevents the door from loosening or deforming during frequent use. During use, when preparing to insert a sample water tube or test a sample, the operator only needs to gently lift the movable door 214. The door smoothly flips open around the hinge axis, revealing the installation space inside the light-shielding frame 201. At this time, the test tube can be directly placed in the rubber cylinder 203 through the turntable 202 and the rotating plate 4. For example, in a bright outdoor testing environment, after closing the movable door 214, the sealing performance of the light-shielding frame 201 completely blocks external light source interference, allowing the COD detector sensor to receive only the internal reflectance spectrum of the sample, avoiding false positive reading deviations caused by direct sunlight. During the calibration phase, closing the movable door 214 can maintain a constant light environment, supporting the controller 5 to stably acquire light signals. When the test tube is removed after testing, the process of closing the movable door 214 in reverse is equally simple. The buffer design of the hinge axis prevents the door from slamming against the main body, causing noise or damage.

[0034] In one embodiment, a mounting frame 6 is fixedly connected to the inner wall of the light-shielding frame 201, and a controller 5 is fixedly connected to the inner wall of the mounting frame 6.

[0035] In this embodiment, the fixed connection of the mounting frame 6 ensures its secure attachment to the inner wall of the light-shielding frame 201, preventing signal distortion caused by vibration transmission to the controller 5. The fixed connection of the controller 5 provides robust circuit support, enabling it to monitor and regulate the operating parameters of the entire device in real time, such as the speed of the stepper motor, the extension and retraction stroke of the hydraulic rod 210, and the activation timing of the wiping mechanism 3. In actual operation, the controller 5, through the positioning of the mounting frame 6, can directly receive feedback signals from the turntable 202 and the transmission components. For example, when calibrating the sample water test tube, the controller 5 will automatically adjust the output of the second stepper motor 207 based on the light sensor data, so that the rotation speed of the rubber cylinder 203 matches the stability requirements of the test tube. For example, if the light at the detection site fluctuates greatly, the controller 5 can use the low-noise environment provided by the fixed inner wall to calculate the COD value deviation and trigger an additional cycle of the wiping ring 303, avoiding interference from dirt in data acquisition.

[0036] In one embodiment, a fixing cylinder 8 is fixedly connected to the upper surface of the turntable 202, a fixing block 7 is snapped into the inside of the fixing cylinder 8, and a rotating plate 4 is fixedly connected to the top of the fixing block 7.

[0037] In this embodiment, the fixed connection of the fixed cylinder 8 makes its rigidity consistent with that of the turntable 202, preventing separation during rotation driven by the stepper motor. The snap-fit ​​method of the fixed block 7 facilitates maintenance or replacement of the rotating plate 4. The fixed connection of the rotating plate 4 further transforms the fixed block 7 into a dynamic support, enabling it to withstand the radial force and rotational torque when the test tube is inserted. During operation, when the sample water test tube is inserted, the test tube first passes through the rotating plate 4 and reaches the rubber cylinder 203 of the turntable 202. The locking block 7 inside the fixed cylinder 8 maintains the horizontality of the rotating plate 4, preventing the test tube from shifting due to gravity. For example, when processing high-viscosity water samples, the rotating plate 4, supported by the fixed block 7, can evenly distribute the weight of the test tube, avoiding inaccurate calibration caused by the tilt of the turntable 202. The elasticity of the locking design allows the fixed block 7 to pop out when necessary, facilitating the cleaning of internal residues. When the first stepper motor 206 rotates the turntable 202, the fixed cylinder 8 transmits power to the rotating plate 4, causing the entire platform to rotate synchronously, supporting multi-position sample switching. When testing multiple samples, the stability of the rotating plate 4 ensures the centering accuracy of the test tube at each position.

[0038] In one embodiment, the upper surface of the rotating plate 4 is provided with a plurality of identical sliding grooves 11, and a sliding block 10 is slidably connected inside each sliding groove 11, and a force-bearing plate 9 is fixedly connected to the upper surface of each sliding block 10.

[0039] In this embodiment, the sliding groove 11 allows the sliding block 10 to move freely and linearly on the plate surface. The sliding connection of the sliding block 10 allows it to automatically adapt to the diameter of the test tube, avoiding the limitations of fixed clamps. The fixed connection of the force plate 9 integrates the two sliding blocks 10 into one operating unit, facilitating the application of uniform force and achieving rapid clamping of the test tube. In use, the operator pulls the force plate 9 to make the sliding block 10 retract inward along the groove, clamping the outer wall of the test tube. For example, after inserting a standard sample water test tube, gently pulling the force plate 9 will allow the sliding block 10 to slide to a suitable position, stabilizing the frictional contact between the test tube and the rubber cylinder 203.

[0040] In one embodiment, a force-bearing spring 13 is fixedly connected to one side of each sliding block 10, one end of each force-bearing spring 13 is fixedly connected to the inner wall of the rotating plate 4, and a connecting shaft 15 is fixedly connected to the other side of each sliding block 10. A rubber block 14 is fixedly connected to one end of every two connecting shafts 15.

[0041] In this embodiment, a rubber block 14 is fixedly connected to one end of each pair of connecting shafts 15. This combination of elastic buffering and auxiliary clamping enhances the reliability and anti-slip performance of the test tube fixation. The fixed connection of the force spring 13 provides rebound force, allowing the sliding block 10 to automatically reset after release. The design of connecting to the inner wall of the rotating plate 4 ensures constant tension of the spring, preventing slack from affecting clamping. The fixed connection of the connecting shaft 15 extends the sliding block 10 to the outside, supporting the installation of the rubber block 14. The fixed connection of the rubber block 14 further utilizes its high coefficient of friction to achieve flexible gripping of the test tube. In actual clamping, when the force plate 9 is pulled, the sliding block 10 compresses the force spring 13 to store energy, and the rubber block 14 then adheres to the surface of the test tube. For example, on a wet test tube, the texture of the rubber block 14 can prevent slippage, and the spring's buffer absorbs the impact. After the test is completed, the force plate 9 is released, the spring pushes the sliding block 10 back to its original position, and the rubber block 14 detaches from the test tube for easy removal.

[0042] In one embodiment, two positioning shafts 12 are fixedly connected to one side of each rubber block 14, and the outer surface of each positioning shaft 12 is slidably connected to the interior of the rotating plate 4.

[0043] In this embodiment, the fixed connection of the positioning shaft 12 allows it to move synchronously with the rubber block 14. The sliding connection of the outer surface to the guide groove inside the rotating plate 4 restricts the radial offset of the shaft, providing precise linear constraint and avoiding uneven force caused by the skewing of the rubber block 14 during clamping. In operation, when the sliding block 10 moves, the two positioning shafts 12 slide along the inside of the rotating plate 4 to guide the rubber block 14. For example, when clamping a sample water test tube, the parallel sliding of the positioning shafts 12 allows the rubber block 14 to apply force evenly, preventing the test tube from tilting.

[0044] In one embodiment, the transmission assembly includes a rotating gear 305, the outer surface of which is rotatably connected to the inner wall of the water quality analyzer body 1. A rectangular groove 306 is formed on the upper surface of the rotating gear 305, and a rectangular block 304 is slidably connected inside the rectangular groove 306. A wiping ring 303 is disposed on the outer surface of the rectangular block 304. A telescopic rod 302 is fixedly connected to the inner side wall of the light-shielding frame 201, and a transmission toothed plate 301 is fixedly connected to the telescopic end of the telescopic rod 302. The outer surface of the transmission toothed plate 301 meshes with the outer surface of the rotating gear 305.

[0045] In this embodiment, the rotating gear 305 ensures stable rotation within the inner wall of the detector, while the sliding connection between the rectangular groove 306 and the rectangular block 304 allows the wiping ring 303 to move slightly along the test tube axis to accommodate different lengths. The fixed connection of the telescopic rod 302 provides linear driving force, and the engagement of the transmission gear plate 301 converts extension and contraction into rotation, driving the entire assembly to work synchronously. During wiping, the controller 5 activates the telescopic rod 302, pushing the transmission gear plate 301 to slide. The gear plate engages with the rotating gear 305 to generate torque, causing the rectangular block 304 to slide and rotate, contacting the test tube. For example, when removing residual water stains after calibration, the flexible material of the wiping ring 303 scrapes evenly, avoiding scratches.

[0046] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A water quality COD analysis device, characterized in that, include: The detector body (1); The calibration mechanism (2) is located on the outside of the instrument body (1) and includes a first stepper motor (206) and a second stepper motor (207) fixed on the water quality instrument body (1). The output end of the first stepper motor (206) is fixedly connected to a turntable (202). Several identical rectangular frames (204) are fixedly connected to the outer surface of the turntable (202). A rubber cylinder (203) is rotatably connected to the inner wall of each rectangular frame (204). One end of several rubber cylinders (203) is fixedly connected to a docking cylinder (205). The output end of the second stepper motor (207) is provided with a drive shaft (209). One end of the drive shaft (209) is connected to a docking block (213). The docking block (213) matches the docking cylinder (205). The wiping mechanism (3) is located on the outside of the water quality tester body (1) and includes a transmission component and a wiping ring (303). The transmission component and the wiping ring (303) work together to wipe the surface of the test tube of the test sample.

2. The water quality COD analysis device according to claim 1, characterized in that, A fixed plate (208) is fixedly connected to the upper surface of the water quality tester body (1). The inner wall of the fixed plate (208) is rotatably connected to the transmission shaft (209). A transmission cylinder (211) is slidably connected to the outer surface of the transmission shaft (209). A docking block (213) is connected to one end of the transmission cylinder (211). A hydraulic rod (210) is connected to the inner wall of the fixed plate (208). A moving plate (212) is connected to the telescopic end of the hydraulic rod (210). The outer surface of the transmission cylinder (211) is rotatably connected to the inner wall of the moving plate (212).

3. The water quality COD analysis device according to claim 2, characterized in that, The bottom surface of the movable plate (212) is fixedly connected to two connecting blocks (16), and the inner wall of each connecting block (16) is fixedly connected to a bullseye bearing (17). The outer surface of each bullseye bearing (17) is in contact with the upper surface of the COD water quality analyzer body (1).

4. The water quality COD analysis device according to claim 1, characterized in that, A light-shielding frame (201) is fixedly connected to the upper surface of the water quality tester body (1), and a movable door (214) is movably hinged to the upper surface of the light-shielding frame (201).

5. A water quality COD analysis device according to claim 4, characterized in that, The inner wall of the light-shielding frame (201) is fixedly connected to the mounting frame (6), and the inner wall of the mounting frame (6) is fixedly connected to the controller (5).

6. The water quality COD analysis device according to claim 1, characterized in that, A fixed cylinder (8) is fixedly connected to the upper surface of the turntable (202), a fixed block (7) is snapped into the inside of the fixed cylinder (8), and a rotating plate (4) is fixedly connected to the top of the fixed block (7).

7. A water quality COD analysis device according to claim 6, characterized in that, The upper surface of the rotating plate (4) is provided with several identical sliding grooves (11), and each sliding groove (11) is slidably connected to a sliding block (10), and a force plate (9) is fixedly connected to the upper surface of every two sliding blocks (10).

8. A water quality COD analysis device according to claim 7, characterized in that, Each of the sliding blocks (10) has a force spring (13) fixedly connected to one side, and one end of each force spring (13) is fixedly connected to the inner wall of the rotating plate (4). Each of the sliding blocks (10) has a connecting shaft (15) fixedly connected to the other side, and one end of each pair of connecting shafts (15) is fixedly connected to a rubber block (14).

9. A water quality COD analysis device according to claim 8, characterized in that, Two positioning shafts (12) are fixedly connected to one side of each of the rubber blocks (14), and the outer surface of each positioning shaft (12) is slidably connected to the inside of the rotating plate (4).

10. A water quality COD analysis device according to claim 4, characterized in that, The transmission assembly includes a rotating gear (305), the outer surface of which is rotatably connected to the inner wall of the water quality analyzer body (1). A rectangular groove (306) is provided on the upper surface of the rotating gear (305). A rectangular block (304) is slidably connected inside the rectangular groove (306). A wiping ring (303) is provided on the outer surface of the rectangular block (304). A telescopic rod (302) is fixedly connected to the inner side wall of the light-shielding frame (201). A transmission toothed plate (301) is fixedly connected to the telescopic end of the telescopic rod (302). The outer surface of the transmission toothed plate (301) meshes with the outer surface of the rotating gear (305).

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