Solution sample injection adding mechanism and COD (Chemical Oxygen Demand) analyzer comprising same

Abstract

The invention relates to the technical field of COD (Chemical Oxygen Demand) analyzers, in particular to a solution sample feeding and adding mechanism and a COD analyzer comprising the same, the solution sample feeding and adding mechanism comprises a frame body and a guide rail fixedly mounted on the frame body, and further comprises a sliding frame transversely and movably mounted on the guide rail; the moving frame is slidably mounted on one side of the sliding frame; the lifting frame is vertically mounted on the moving frame in a sliding manner; the fixed rod is fixedly mounted in the lifting frame; the sliding block and the transverse linear array are movably mounted on the outer side of the fixed rod; the fixed frame is fixedly mounted on one side of the sliding block; one end of the feeding pipe movably penetrates through the inner wall of the top of the notch; the adjusting assembly is arranged in the lifting frame and used for driving the multiple feeding pipes to move transversely. According to the solution sample feeding and adding mechanism, the intervals among the multiple feeding pipes can be adjusted through the adjusting assembly, when equipment does not work, the feeding pipes are close to each other, space is saved, when the equipment works, the feeding pipes are far away from each other, reagent adding is facilitated, and observation by workers is facilitated.

Description

Technical Field

[0001] This invention relates to the field of COD analyzer technology, and in particular to a solution injection and addition mechanism and a COD analyzer containing the mechanism. Background Technology

[0002] Chemical oxygen demand (COD) is a core indicator for measuring the degree of organic pollution in water bodies. Its value represents the amount of oxygen consumed by reducing substances (mainly organic matter) in water that can be oxidized by strong oxidants. A COD analyzer is a specialized instrument that automatically or semi-automatically determines the COD value of water samples using standardized detection methods (such as the potassium dichromate method, potassium permanganate method, and rapid digestion spectrophotometry). It is widely used in water quality monitoring, environmental supervision, and industrial production, and is a key device for ensuring water environment safety and pollution control effectiveness.

[0003] In existing technologies, the intervals between multiple droppers in a COD analyzer are usually fixed. COD monitoring requires the addition of water samples, oxidants (such as potassium dichromate), catalysts (such as silver sulfate), blank reagents, etc., through different droppers. If the intervals between droppers are too small when adding materials, "reagent crosstalk" (such as blank reagent being contaminated by water samples) will occur due to reagent dripping and atomization splashing, directly affecting the accuracy of the test results. If the intervals between droppers are too large, when the equipment is in standby or storage state, if the droppers (especially those with precision connectors, hoses, or nozzles) are placed separately, they are prone to deformation, loosening of connectors, or even nozzle blockage due to equipment handling, collisions with surrounding objects, or dust accumulation. Summary of the Invention

[0004] Therefore, it is necessary to provide a solution injection and addition mechanism that can adaptively adjust the feed tube interval according to actual needs, and a COD analyzer containing such mechanism, in order to address the above-mentioned technical problems.

[0005] The present invention provides a solution injection and addition mechanism, comprising a frame and a guide rail fixedly mounted on the frame, and further comprising: A sliding frame is laterally movably mounted on the guide rail; A movable frame is slidably mounted on one side of the sliding frame; The lifting frame is vertically slidably mounted on the movable frame; The fixing rod is fixedly installed inside the lifting frame; Multiple sliding blocks are movably mounted in a horizontal linear array on the outside of the fixed rod. A fixed frame is fixedly installed on one side of the sliding block, and a slot is provided inside it; The feed pipe has one end that extends through the inner wall of the top of the slot. An adjustment assembly, located inside the lifting frame, is used to drive the multiple feed tubes to move laterally.

[0006] In one embodiment, the adjustment component includes a movable plate with a vertical groove in the middle and multiple inclined grooves symmetrically formed at both ends of the vertical groove. The number of inclined grooves on both sides is the same. A limiting rod is fixedly provided on the side of the fixed frame near the movable plate, and the limiting rod is slidably connected to the vertical groove and the inclined groove.

[0007] In one embodiment, a fixed plate is fixedly provided on one side of the top of the movable plate, and a lead screw is movably provided through the center of the fixed plate, with one end of the lead screw being rotatably connected to the inner wall of the lifting frame.

[0008] In one embodiment, a vertical plate is fixedly provided on one side of the lifting frame, and a sliding groove is provided on the vertical plate. A positioning rod is fixedly provided on the side of the moving plate near the vertical plate, and the end of the positioning rod away from the moving plate slides and fits into the sliding groove.

[0009] In one embodiment, a protective frame is slidably disposed within the fixed frame, the feed pipe movably passes through the protective frame, a rotating rod is movably connected to the top of the protective frame, the rotating rod is threadedly adapted to the protective frame, and the end of the rotating rod away from the protective frame is rotatably connected to the inner wall of the fixed frame.

[0010] In one embodiment, a crossbar is movably provided through one side of the fixed frame, and the crossbar is connected to the rotating rod via a bevel gear transmission.

[0011] In one embodiment, the crossbar extends through the fixed frame at the end away from the bevel gear and is fixedly fitted with a drive gear at the end. The movable plate is fixedly provided with a drive rack on one side of the vertical groove and the inclined groove, and the drive gear meshes with the drive rack for transmission.

[0012] In one embodiment, a positioning plate is fixedly provided on one side of the bottom of the protective frame, a round rod is movably provided through the center of the positioning plate, a cover plate is fixedly provided at one end of the round rod, and the cover plate movably abuts against the bottom of the protective frame.

[0013] In one embodiment, a through groove is provided on one side of the protective frame, and a positioning rack is movably disposed in the through groove. The top of the positioning rack is fixedly connected to the inner wall of the top of the groove. A positioning gear is fixedly disposed at the end of the round rod away from the cover plate, and the positioning gear meshes with the positioning rack for transmission.

[0014] In one embodiment, a horizontal groove is provided at the bottom of the protective frame, and a movable rod is movably disposed in the horizontal groove. One end of the movable rod is movably connected to a rotating plate, and the end of the rotating plate away from the movable rod is movably connected to the cover plate.

[0015] In one embodiment, the protective frame has a movable groove above the horizontal groove, and a stop block is movably disposed in the movable groove. The top of the stop block is fixedly connected to the inner wall of the movable groove by a spring. Notches are provided at both ends of the stop block, and the stop block movably abuts against the movable rod. An abutting rod is fixedly disposed on one side of the fixed frame, and the abutting rod movably abuts against the stop block.

[0016] In one embodiment, a COD analyzer includes the aforementioned solution injection and addition mechanism.

[0017] The aforementioned solution injection and addition mechanism and COD analyzer containing this mechanism allow for adjustment of the spacing between multiple feed tubes via an adjustment component. When the equipment is not in operation, the feed tubes are close together to save space; when the equipment is in operation, the feed tubes are spaced apart to facilitate reagent addition and allow for easy observation by staff. A rotating rod moves the protective frame up and down, allowing the feed tubes to be protected from damage when the equipment is not in operation. The contact between the cover plate and the bottom of the protective frame further protects the feed tubes. The contact between the movable rod and the stop enhances the stability of the cover plate when it is open. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the lifting frame in this invention; Figure 3 This is a schematic diagram of the vertical groove structure in this invention; Figure 4 This is a schematic diagram of the slot structure in this invention; Figure 5 This is a schematic diagram of the fixed frame structure in this invention; Figure 6 for Figure 5 Enlarged diagram of part A in the middle; Figure 7 for Figure 6 Enlarged diagram of section B; Figure 8 This is a schematic diagram of the rotating rod in this invention; Figure 9 This is a schematic diagram of the structure at the bottom of the protective frame in this invention; Figure 10 for Figure 9 Enlarged diagram of section C.

[0020] Figure label: 1. Frame; 2. Guide rail; 3. Sliding frame; 4. Moving frame; 5. Lifting frame; 6. Fixed rod; 7. Sliding block; 8. Fixed frame; 81. Groove; 9. Adjusting component; 91. Moving plate; 92. Vertical groove; 93. Inclined groove; 94. Limiting rod; 10. Feed pipe; 11. Fixed plate; 12. Lead screw; 13. Vertical plate; 131. Sliding groove; 14. Positioning rod; 15. Protective frame; 151. Through groove; 152. Horizontal groove; 153. Moving groove; 16. Rotating rod; 17. Horizontal bar; 18. Bevel gear; 19. Drive gear; 20. Drive rack; 21. Positioning plate; 22. Round rod; 23. Cover plate; 24. Positioning rack; 25. Positioning gear; 26. Movable rod; 27. Rotating plate; 29. ​​Stop block; 291. Notch; 30. Spring; 31. Abutment rod. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this specification are for illustrative purposes only and do not represent the only possible implementation.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0026] The following is combined Figures 1-10 This invention describes a solution injection and addition mechanism and a COD analyzer containing the mechanism.

[0027] like Figures 1-5 As shown, in one embodiment, a solution injection and addition mechanism includes a frame 1 and a guide rail 2 fixedly mounted on the frame 1, and further includes: The sliding frame 3 is horizontally movable on the guide rail 2; The movable frame 4 is slidably mounted on one side of the sliding frame 3; The lifting frame 5 is vertically slidably mounted on the movable frame 4; The fixing rod 6 is fixedly installed inside the lifting frame 5; Sliding blocks 7 are movably mounted in a horizontal linear array on the outside of fixed rods 6, and multiple blocks are configured in number. The fixed frame 8 is fixedly installed on one side of the sliding block 7, and a slot 81 is opened inside it; Feed pipe 10, one end of which movably penetrates the top inner wall of slot 81; Adjustment component 9, located inside lifting frame 5, is used to drive multiple feed pipes 10 to move laterally.

[0028] Specifically, the frame 1 is equipped with a reagent tube rack, into which multiple reagent tubes are placed. The top of the feed tube 10 penetrates the inner wall of the slot 81 opened in the fixed frame 8. The top of the feed tube 10 is connected to the infusion device on the frame 1 via a flexible tube. The sliding frame 3 moves laterally along the guide rail 2, the moving frame 4 moves laterally along the sliding frame 3, and the lifting frame 5 slides up and down along the moving frame 4. This will cause the fixed rod 6, the sliding block 7, the fixed frame 8, and the feed tube 10 to adjust their positions together, allowing reagents to be added to all the reagent tubes. When the equipment is not working, the adjusting component 9 causes the multiple sliding blocks 7, the fixed frame 8, and the feed tube 10 to move closer together. This design reduces the horizontal / vertical space required, reserving more installation space for other core components, making it particularly suitable for miniaturized, integrated portable COD analyzers. When the equipment needs to operate, adjusting component 9 moves the feed tubes 10 further apart, increasing the interval between them. This facilitates the addition of reagents to the reagent tubes. During operation, the feed tubes 10 are extended, allowing operators to clearly observe the feeding status of each tube (such as whether there is leakage or whether the flow rate is normal). If any abnormality occurs (such as nozzle blockage), the problematic tube can be quickly located and maintained. If the feed tubes 10 are always close together, the fault signal may be missed due to obstructed vision, delaying troubleshooting.

[0029] See Figures 2-5 As shown, in this embodiment, the adjustment component 9 includes a movable plate 91, a vertical groove 92 is provided in the middle of the movable plate 91, and multiple inclined grooves 93 are symmetrically provided on both ends of the vertical groove 92. The number of inclined grooves 93 on both sides is the same. A limit rod 94 is fixedly provided on the side of the fixed frame 8 near the movable plate 91. The limit rod 94 is slidably connected to the vertical groove 92 and the inclined grooves 93.

[0030] Specifically, when reagent needs to be added to the reagent tube, the moving plate 91 moves upward along the lifting frame 5. The upward movement of the moving plate 91 causes the vertical groove 92 and the inclined groove 93 to move upward. In this application, the number of vertical grooves 92 is set to one, and the number of inclined grooves 93 is set to four, with two on each side. The upward movement of the moving plate 91 will cause the limiting rods 94 and the fixing frame 8 on both sides to move away from each other through the action of the inclined grooves 93, so that the feed tubes 10 on both sides move away from each other. The fixing frame 8 and the feed tube 10 corresponding to the middle vertical groove 92 remain stationary. The position and spacing of the feed tube 10 can be changed by moving the moving plate 91, which is convenient for adding reagent.

[0031] See Figure 2 and Figure 3 As shown, in this embodiment, a fixed plate 11 is fixedly installed on one side of the top of the movable plate 91, and a lead screw 12 is movably installed through the center of the fixed plate 11. One end of the lead screw 12 is rotatably connected to the inner wall of the lifting frame 5.

[0032] Specifically, the forward and reverse rotation of the lead screw 12 can drive the fixed plate 11 and the moving plate 91 to move up and down along the lifting frame 5. The position of the feed pipe 10 can be adjusted by moving the moving plate 91.

[0033] See Figure 2 and Figure 3 As shown, in this embodiment, a vertical plate 13 is fixedly installed on one side of the lifting frame 5, and a sliding groove 131 is provided on the vertical plate 13. A positioning rod 14 is fixedly installed on the side of the moving plate 91 near the vertical plate 13, and the end of the positioning rod 14 away from the moving plate 91 slides and fits in contact with the sliding groove 131.

[0034] Specifically, the rotation of the lead screw 12 will cause the fixed plate 11 and the moving plate 91 to move up and down. During the up and down movement of the moving plate 91, the positioning rod 14 will move up and down along the sliding groove 131 opened in the vertical plate 13, which can ensure that the moving plate 91 will not rotate with the rotation of the lead screw 12 during the up and down movement.

[0035] See Figure 5 and Figure 8 As shown, in this embodiment, a protective frame 15 is slidably disposed inside the fixed frame 8, the feed pipe 10 movably passes through the protective frame 15, and a rotating rod 16 is movably connected to the top of the protective frame 15. The rotating rod 16 is threadedly connected to the protective frame 15, and the end of the rotating rod 16 away from the protective frame 15 is rotatably connected to the inner wall of the fixed frame 8.

[0036] Specifically, when the equipment is not in operation, the protective frame 15 covers the bottom of the feed tube 10, which provides some protection for the feed tube 10 and prevents external objects from damaging it. When it is necessary to add reagent to the reagent tube using the feed tube 10, the rotating rod 16 is rotated. Since the rotating rod 16 is threadedly connected to the protective frame 15, the rotation of the rotating rod 16 will cause the protective frame 15 to move upward along the fixed frame 8, thereby exposing the bottom of the feed tube 10 for easy addition of reagent. Similarly, when the equipment is not in use, rotating the rotating rod 16 in the opposite direction will cause the protective frame 15 to move downward to cover and protect the feed tube 10.

[0037] See Figure 8 As shown, in this embodiment, a crossbar 17 is movably provided through one side of the fixed frame 8, and the crossbar 17 and the rotating rod 16 are connected by a bevel gear 18.

[0038] Specifically, the rotation of the crossbar 17 can be achieved by the transmission of the bevel gear 18 to realize the synchronous rotation of the rotating rod 16. The forward and reverse rotation of the rotating rod 16 can realize the up and down movement of the protective frame 15 along the fixed frame 8.

[0039] See Figure 2 and Figure 8As shown, in this embodiment, the end of the crossbar 17 away from the bevel gear 18 moves through the fixed frame 8 and the end is fixedly sleeved with the drive gear 19. The moving plate 91 is fixedly provided with a drive rack 20 on one side of the vertical groove 92 and the inclined groove 93. The drive gear 19 and the drive rack 20 mesh and transmit power.

[0040] Specifically, when the moving plate 91 moves upward, the fixed frame 8 and the feed pipe 10 move away from each other, and the drive gear 19 also moves relative to the vertical groove 92 and the inclined groove 93. During the movement, the drive gear 19 meshes with the drive rack 20 to achieve the rotation of the drive gear 19, which drives the crossbar 17 and the bevel gear 18 to rotate, thereby achieving the rotation of the rotating rod 16 and driving the protective frame 15 to move upward, exposing the bottom of the feed pipe 10 for easy addition of reagents. Similarly, when the moving plate 91 moves downward, the feed pipes 10 move closer together, the rotating rod 16 rotates in the opposite direction, and the protective frame 15 moves downward, covering the bottom of the feed pipe 10 inside, thus protecting the feed pipe 10.

[0041] See Figure 9 and Figure 10 As shown, in this embodiment, a positioning plate 21 is fixedly provided on one side of the bottom of the protective frame 15, a round rod 22 is movably provided through the center of the positioning plate 21, a cover plate 23 is fixedly provided at one end of the round rod 22, and the cover plate 23 is movably abutting against the bottom of the protective frame 15.

[0042] Specifically, when the equipment is not in use, the protective frame 15 covers the feed tube 10 inside, and the cover plate 23 is flush with the bottom of the protective frame 15, which can prevent external dust and other impurities from accumulating at the nozzle of the feed tube 10 and causing contamination during reagent addition. When the equipment needs to be used, the round rod 22 is rotated clockwise. The clockwise rotation of the round rod 22 relative to the positioning plate 21 will drive the cover plate 23 to rotate clockwise. The surface of the cover plate 23 will no longer be in contact with the bottom of the protective frame 15. Subsequently, the protective frame 15 moves upward to expose the feed tube 10, making it convenient to add reagents.

[0043] See Figure 8 and Figure 10 As shown, in this embodiment, a through groove 151 is provided on one side of the protective frame 15, and a positioning rack 24 is movably arranged in the through groove 151. The top of the positioning rack 24 is fixedly connected to the top inner wall of the groove 81. A positioning gear 25 is fixedly arranged at the end of the round rod 22 away from the cover plate 23. The positioning gear 25 meshes with the positioning rack 24 for transmission.

[0044] Specifically, when the equipment is not in use, the protective frame 15 covers the feed pipe 10 inside, and the cover plate 23 is flush with the bottom of the protective frame 15. The rotation of the rotating rod 16 will cause the protective frame 15 to move upward. The positioning rack 24 moves downward relative to the protective frame 15 along the through groove 151. During the upward movement of the protective frame 15, the positioning gear 25 will engage with the positioning rack 24. The positioning gear 25 rotates clockwise, causing the round rod 22 and the cover plate 23 to rotate 90 degrees clockwise. The cover plate 23 changes from horizontal to vertical. Then the protective frame 15 continues to move upward, which can expose the bottom of the feed pipe 10 for easy addition of reagents.

[0045] See Figure 6 As shown, in this embodiment, a horizontal groove 152 is provided at the bottom of the protective frame 15, and a movable rod 26 is movably arranged in the horizontal groove 152. One end of the movable rod 26 is movably connected to a rotating plate 27, and the end of the rotating plate 27 away from the movable rod 26 is movably connected to the cover plate 23.

[0046] Specifically, the clockwise rotation of the round rod 22 will cause the cover plate 23 to flip, the rotation of the cover plate 23 will cause the rotating plate 27 to rotate, and the rotation of the rotating plate 27 will cause the movable rod 26 to move laterally along the transverse groove 152, which can improve the stability of the cover plate 23 during the flipping process.

[0047] See Figure 6 and Figure 7 As shown, in this embodiment, the protective frame 15 has a movable groove 153 above the horizontal groove 152. A stop block 29 is movably arranged in the movable groove 153. The top of the stop block 29 is fixedly connected to the inner wall of the movable groove 153 by a spring 30. Both ends of the stop block 29 have notches 291. The stop block 29 and the movable rod 26 are movably abutted. An abutting rod 31 is fixedly arranged on one side of the fixed frame 8. The abutting rod 31 and the stop block 29 are movably abutted.

[0048] Specifically, during the upward movement of the protective frame 15, the cover plate 23 first rotates clockwise and flips, causing the movable rod 26 to move along the transverse groove 152 toward the moving groove 153 until it abuts against one end of the transverse groove 152. At this time, the cover plate 23 is in a vertically open state. Then, the protective frame 15 continues to move upward to expose the feed pipe 10. After the protective frame 15 moves upward a certain distance, the top of the stop block 29 contacts the abutment rod 31. Under the limiting action of the abutment rod 31, the stop block 29 will move downward. The stop plate moves downward along the moving groove 153 until one side abuts against the movable rod 26. At this time, the movable rod 26 is in a state where it cannot move, which can ensure that the cover plate 23 will not shake during the opening process, and the spring 30 is in a stretched state. After the feed pipe 10 is used, the protective frame 15 moves downward. The stop block 29 no longer contacts the abutment rod 31. Under the action of the spring 30, the stop block 29 will move upward along the moving groove 153. The stop block 29 will no longer abut against the movable rod 26. The movable rod 26 can move relative to the transverse groove 152, which facilitates the closing of the cover plate 23 and can protect the feed pipe 10 inside. The stop block 29 has notches 291 on both sides. After the spring 30 has been used for a long time, its elasticity will weaken and it may not be able to enter the moving groove 153 completely. A part of the bottom will be located in the transverse groove 152. In this case, the movable rod 26 will abut against the notches 291 on both sides during the movement along the transverse groove 152, which will drive the stop block 29 to move upward along the moving groove 153. This will not affect the movement of the movable rod 26 and avoid affecting the opening or closing of the cover plate 23.

[0049] In this embodiment, a COD analyzer includes the above-mentioned solution injection and addition mechanism.

[0050] Specifically, the COD analyzer includes the aforementioned reagent addition mechanism and can also be equipped with a device for cleaning the feed tube 10 to ensure its cleanliness.

[0051] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A solution injection and addition mechanism, comprising a frame and a guide rail fixedly mounted on the frame, characterized in that, Also includes: A sliding frame is laterally movably mounted on the guide rail; A movable frame is slidably mounted on one side of the sliding frame; The lifting frame is vertically slidably mounted on the movable frame; The fixing rod is fixedly installed inside the lifting frame; Multiple sliding blocks are movably mounted in a horizontal linear array on the outside of the fixed rod. A fixed frame is fixedly installed on one side of the sliding block, and a slot is provided inside it; The feed pipe has one end that extends through the inner wall of the top of the slot. An adjustment assembly, located inside the lifting frame, is used to drive the multiple feed tubes to move laterally.

2. The solution injection and addition mechanism according to claim 1, characterized in that, The adjustment assembly includes a movable plate with a vertical groove in the middle and multiple inclined grooves symmetrically formed at both ends of the vertical groove. The number of inclined grooves on both sides is the same. A limit rod is fixedly provided on the side of the fixed frame near the movable plate, and the limit rod is slidably connected to the vertical groove and the inclined groove.

3. The solution injection and addition mechanism according to claim 2, characterized in that, A fixed plate is fixedly installed on one side of the top of the movable plate, and a lead screw is movably inserted through the center of the fixed plate, with one end of the lead screw rotatably connected to the inner wall of the lifting frame.

4. The solution injection and addition mechanism according to claim 3, characterized in that, A vertical plate is fixedly installed on one side of the lifting frame, and a sliding groove is provided on the vertical plate. A positioning rod is fixedly installed on the side of the moving plate near the vertical plate, and the end of the positioning rod away from the moving plate slides and fits into the sliding groove.

5. The solution injection and addition mechanism according to claim 4, characterized in that, A protective frame is slidably disposed within the fixed frame, and the feed pipe movably passes through the protective frame. A rotating rod is movably connected to the top of the protective frame, and the rotating rod is threadedly connected to the protective frame. The end of the rotating rod away from the protective frame is rotatably connected to the inner wall of the fixed frame.

6. The solution injection and addition mechanism according to claim 5, characterized in that, A crossbar is movably connected through one side of the fixed frame, and the crossbar is connected to the rotating rod via a bevel gear transmission.

7. The solution injection and addition mechanism according to claim 6, characterized in that, The crossbar extends through the fixed frame at the end away from the bevel gear and is fixedly fitted with a drive gear at the end. The moving plate is fixedly fitted with a drive rack on one side of the vertical groove and the inclined groove. The drive gear meshes with the drive rack for transmission.

8. The solution injection and addition mechanism according to claim 7, characterized in that, A positioning plate is fixedly installed on one side of the bottom of the protective frame. A round rod is movably inserted through the center of the positioning plate. A cover plate is fixedly installed at one end of the round rod, and the cover plate movably abuts against the bottom of the protective frame.

9. A solution injection and addition mechanism according to claim 8, characterized in that, A through groove is provided on one side of the protective frame, and a positioning rack is movably arranged in the through groove. The top of the positioning rack is fixedly connected to the inner wall of the top of the groove. A positioning gear is fixedly arranged at the end of the round rod away from the cover plate, and the positioning gear meshes with the positioning rack for transmission.

10. A solution injection and addition mechanism according to claim 9, characterized in that, The bottom of the protective frame is provided with a horizontal groove, and a movable rod is movably arranged in the horizontal groove. One end of the movable rod is movably connected to a rotating plate, and the end of the rotating plate away from the movable rod is movably connected to the cover plate.

11. A solution injection and addition mechanism according to claim 10, characterized in that, The protective frame has a movable groove above the horizontal groove. A stop block is movably installed in the movable groove. The top of the stop block is fixedly connected to the inner wall of the movable groove by a spring. Notches are opened at both ends of the stop block. The stop block movably abuts against the movable rod. An abutting rod is fixedly installed on one side of the fixed frame. The abutting rod movably abuts against the stop block.

12. A COD analyzer, characterized in that, It includes a solution injection and addition mechanism as described in any one of claims 1-11.

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