A solution sample adding mechanism and COD analyzer containing the same

Abstract

The present application relates to COD analyzer technical field, particularly to a kind of solution sample adding mechanism and the COD analyzer containing the mechanism, including frame and fixedly installed guide rail on frame, further include: sliding frame, transversely movable installation is in guide rail;Moving frame, sliding installation is in one side of sliding frame;Lifting frame, vertically sliding installation is in moving frame;Fixed rod, fixedly installed in lifting frame interior;Sliding block, transverse linear array movable installation is in the outside of fixed rod;Fixed frame, fixedly installed in one side of sliding block;Feed pipe, one end movablely penetrates the inner wall of slot top;Adjusting assembly, be located in lifting frame interior, for driving multiple feed pipe transverse movement.The solution sample adding mechanism provided by the present application can adjust the interval between multiple feed pipes by adjusting assembly, when the equipment is not working, feed pipe is close, save space, when the equipment works, feed pipe is far away from each other, it is convenient to add reagent and facilitate staff observation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of COD analyzers, in particular to a solution sample feeding and adding mechanism and a COD analyzer comprising the same. BACKGROUND

[0002] Chemical oxygen demand is a core index for measuring the degree of organic pollution in water, and its value represents the amount of oxygen consumed by reducible substances (mainly organic matter) in water that can be oxidized by a strong oxidizing agent. COD analyzers are special instruments that automatically or semi-automatically complete the determination of COD values of water samples through standardized detection methods (such as potassium dichromate method, potassium permanganate method, and rapid digestion spectrophotometric method, etc.), and are widely used in water quality monitoring, environmental protection supervision, and industrial production, etc. They are key equipment for ensuring water environmental safety and pollution control effect.

[0003] In the prior art, the spacing between multiple droppers in a COD analyzer is usually fixed. COD monitoring requires the addition of water samples, oxidizing agents (such as potassium dichromate), catalysts (such as silver sulfate), and blank reagents through different droppers. If the spacing between the droppers is too small, the reagents will drop, atomize, and splash, causing "reagent cross-talk" (such as blank reagent contamination by water sample), which directly affects the accuracy of the test results. If the spacing between the droppers is large, the equipment is in standby or storage state when not in use. If the droppers (especially components with precision joints, hoses, or nozzles) are placed separately, they are prone to deformation, joint loosening, and even nozzle blockage due to equipment handling, collision with surrounding objects, or dust accumulation. SUMMARY

[0004] Therefore, it is necessary to provide a solution sample feeding and adding mechanism that can adaptively adjust the spacing of the feeding pipes according to actual needs and a COD analyzer comprising the same.

[0005] The solution sample feeding and adding mechanism provided by the present application comprises a frame body and a guide rail fixedly installed on the frame body, and further comprises:

[0006] a sliding frame laterally movably installed on the guide rail;

[0007] a moving frame slidably installed on one side of the sliding frame;

[0008] a lifting frame vertically slidably installed on the moving frame;

[0009] a fixed rod fixedly installed inside the lifting frame;

[0010] a plurality of sliding blocks laterally linearly array movably installed outside the fixed rod;

[0011] a fixed frame fixedly installed on one side of the sliding block, and a slot is formed in the inside of the fixed frame;

[0012] a feeding pipe movably penetrating the inner wall of the top of the slot at one end;

[0013] an adjusting assembly arranged inside the lifting frame for driving the lateral movement of the plurality of feeding pipes.

[0014] In one of the embodiments, the adjusting assembly comprises a moving plate, a vertical slot is arranged in the middle of the moving plate, a plurality of inclined slots are symmetrically arranged at both ends of the vertical slot, the number of the inclined slots on both sides is the same, a limiting rod is fixedly arranged on one side of the moving plate close to the fixed frame, and the limiting rod is in sliding connection with the vertical slot and the inclined slots.

[0015] In one of the embodiments, a fixed plate is fixedly arranged on one side of the top of the moving plate, a lead screw is movably arranged through the center of the fixed plate, and one end of the lead screw is in rotational connection with the inner wall of the lifting frame.

[0016] In one of the embodiments, a vertical plate is fixedly arranged on one side of the lifting frame, a sliding slot is arranged on the vertical plate, a positioning rod is fixedly arranged on one side of the moving plate close to the vertical plate, and one end of the positioning rod away from the moving plate is in sliding fit with the sliding slot.

[0017] In one of the embodiments, a protection frame is slidably arranged in the fixed frame, the feeding pipe movably penetrates the protection frame, a rotating rod is movably connected to the top of the protection frame, the rotating rod is in screw fit connection with the protection frame, and one end of the rotating rod away from the protection frame is in rotational connection with the inner wall of the fixed frame.

[0018] In one of the embodiments, a horizontal rod is movably arranged through one side of the fixed frame, and the horizontal rod and the rotating rod are in bevel gear transmission connection.

[0019] In one of the embodiments, one end of the horizontal rod away from the bevel gear movably penetrates the fixed frame and is fixedly sleeved with a driving gear at the tail end, a driving rack is fixedly arranged on one side of the moving plate away from the vertical slot and the inclined slots, and the driving gear and the driving rack are in mesh transmission.

[0020] In one of the embodiments, a positioning plate is fixedly arranged on one side of the bottom of the protection frame, a round rod is movably arranged through the center of the positioning plate, a cover plate is fixedly arranged on one end of the round rod, and the cover plate movably abuts against the bottom of the protection frame.

[0021] In one of the embodiments, a through slot is arranged on one side of the protection frame, a positioning rack is movably arranged in the through slot, the top of the positioning rack is fixedly connected with the inner wall of the top of the slot, a positioning gear is fixedly arranged on one end of the round rod away from the cover plate, and the positioning gear is in mesh transmission with the positioning rack.

[0022] In one of the embodiments, the protection frame is provided with a horizontal slot at the bottom, a movable rod is movably arranged in the horizontal slot, one end of the movable rod is movably connected with a rotating plate, and the end of the rotating plate away from the movable rod is movably connected with the cover plate.

[0023] In one of the embodiments, the protection frame is provided with a moving slot above the horizontal slot, a stop block is movably arranged in the moving slot, the stop block is movably connected with the movable rod, and the stop block is movably connected with the fixed frame through a contact rod.

[0024] In one of the embodiments, a COD analyzer comprises the solution sampling and adding mechanism.

[0025] The solution sampling and adding mechanism and the COD analyzer comprising the same can adjust the interval between the plurality of feeding tubes through the adjusting assembly. When the equipment is not working, the feeding tubes are close to each other to save space. When the equipment is working, the feeding tubes are away from each other to facilitate the addition of reagents and the observation of the staff. The protection frame is driven by the rotating rod to move up and down, so that the feeding tubes can be protected by the protection frame when the equipment is not working. The feeding tubes are further protected through the abutment between the cover plate and the bottom of the protection frame. The stability of the cover plate in the open state is enhanced through the abutment between the movable rod and the stop block. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0028] Figure 2 It is a schematic diagram of the structure of the lifting frame in the present application;

[0029] Figure 3 It is a schematic diagram of the structure of the vertical slot in the present application;

[0030] Figure 4 It is a schematic diagram of the structure of the notch in the present application;

[0031] Figure 5 It is a schematic diagram of the structure of the fixed frame in the present application;

[0032] Figure 6 It isFigure 5 Enlarged view of part A;

[0033] Figure 7 For Figure 6 Enlarged view of part B;

[0034] Figure 8 For the structure diagram of the rotating rod in the application;

[0035] Figure 9 For the structure diagram of the bottom of the protection frame in the application;

[0036] Figure 10 For Figure 9 Enlarged view of part C.

[0037] Reference signs:

[0038] 1, frame; 2, guide rail; 3, sliding frame; 4, moving frame; 5, lifting frame; 6, fixed rod; 7, sliding block; 8, fixed frame; 81, notch; 9, adjusting assembly; 91, moving plate; 92, vertical groove; 93, inclined groove; 94, limiting rod; 10, feeding pipe; 11, fixed plate; 12, lead screw; 13, vertical plate; 131, sliding groove; 14, positioning rod; 15, protection frame; 151, through groove; 152, horizontal groove; 153, moving groove; 16, rotating rod; 17, cross rod; 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, abutting rod. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some 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 work fall within the scope of protection of the present application.

[0040] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or there can be a middle component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or there can be a middle component. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions used in the specification of the present application are for the purpose of illustration only, and do not indicate the only implementation.

[0041] Furthermore, the terms "first", "second", etc. are used herein for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicating a recited technical feature to the exclusion of the other. It is to be understood that a "first", "second", etc. feature so described can also be implicit rather than explicit earlier laid claim feature. In the description of the present application, the meaning of "a plurality" is at least two, for example, two, three, etc., unless otherwise specifically defined.

[0042] In the present application, unless otherwise explicitly specified and limited, the "on", "under", "above" and "over" of a first feature to a second feature can be that the first feature is in direct contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, the "on", "above" and "over" of a first feature to a second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is horizontally higher than the second feature. The "under", "below" and "under" of a first feature to a second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is horizontally lower than the second feature.

[0043] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more related listed items.

[0044] The following will be described in conjunction with Figures 1-10 A solution sampling and adding mechanism and a COD analyzer containing the same are described.

[0045] As Figures 1-5 shown, in one embodiment, a solution sampling and adding mechanism, comprising a frame 1 and a guide rail 2 fixedly installed on the frame 1, further comprising:

[0046] a sliding frame 3 movably installed on the guide rail 2;

[0047] a moving frame 4 slidably installed on one side of the sliding frame 3;

[0048] a lifting frame 5 vertically slidably installed on the moving frame 4;

[0049] a fixed rod 6 fixedly installed inside the lifting frame 5;

[0050] a plurality of sliding blocks 7 movably installed in linear array outside the fixed rod 6;

[0051] a fixed frame 8 fixedly installed on one side of the sliding blocks 7, and a notch 81 is formed in the inside of the fixed frame 8;

[0052] The feeding pipe 10 is movably arranged through the top inner wall of the slot 81.

[0053] The adjusting assembly 9 is arranged in the lifting frame 5 and is used for driving the lateral movement of the plurality of feeding pipes 10.

[0054] Specifically, the rack body 1 is provided with a reagent pipe rack, and a plurality of reagent pipes are placed in the rack. The top of the feeding pipe 10 penetrates the inner wall of the slot 81 of the fixed frame 8. The top of the feeding pipe 10 is connected to the infusion device on the rack body 1 through a hose. The sliding frame 3 moves laterally along the guide rail 2. The moving frame 4 moves laterally along the sliding frame 3. The lifting frame 5 slides up and down along the moving frame 4, which drives the fixed rod 6, the sliding block 7, the fixed frame 8 and the feeding pipe 10 to adjust the position together. The reagent can be added to all reagent pipes. When the equipment is not working, the adjusting assembly 9 drives the plurality of sliding blocks 7, the fixed frame 8 and the feeding pipe 10 to move close to each other in the middle part, so as to reduce the transverse / longitudinal space occupation and reserve more installation positions for other core components, especially for miniaturization and integration of portable COD analyzers. When the equipment needs to work, the adjusting assembly 9 drives the feeding pipe 10 to move away from each other, and the interval between them increases, which can facilitate the addition of reagent to the reagent pipe. When working, the feeding pipe 10 is unfolded, and the operator can clearly observe the feeding state of each pipe (such as whether it is dripping, whether the flow rate is normal), and if an abnormality occurs (such as nozzle blockage), the problem pipe can be quickly located and maintained. If the feeding pipe 10 is always close, it is easy to miss the fault signal due to visual obstruction, which delays troubleshooting.

[0055] Referring to Figures 2-5 In the embodiment, the adjusting assembly 9 includes a moving plate 91. A vertical slot 92 is arranged in the middle of the moving plate 91. A plurality of inclined slots 93 are arranged on both ends of the vertical slot 92 in an axial symmetry. The number of inclined slots 93 on both sides is the same. A limiting rod 94 is fixedly arranged on one side of the fixed frame 8 close to the moving plate 91. The limiting rod 94 is in sliding connection with the vertical slot 92 and the inclined slot 93.

[0056] Specifically, when it is needed to add reagent to the reagent pipe, the moving plate 91 is moved upward along the lifting frame 5. The upward movement of the moving plate 91 drives the upward movement of the vertical slot 92 and the inclined slot 93. In this application, the number of vertical slots 92 is one, and the number of inclined slots 93 is four, two on each side. The upward movement of the moving plate 91 drives the limiting rod 94 and the fixed frame 8 on both sides to move away from each other through the action of the inclined slot 93, so as to realize the movement away from each other of the feeding pipes 10 on both sides. The fixed frame 8 and the feeding pipe 10 corresponding to the middle vertical slot 92 remain unchanged. The movement of the moving plate 91 can change the position and interval of the feeding pipe 10, which is convenient for adding reagent.

[0057] Referring to Figure 2 and Figure 3As shown in the drawings, in this embodiment, the top side of the moving plate 91 is fixedly provided with a fixed plate 11, the center of the fixed plate 11 is movably provided with a lead screw 12, and one end of the lead screw 12 is rotatably connected to the inner wall of the lifting frame 5.

[0058] 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, and the movement of the moving plate 91 can realize the adjustment of the position of the feeding pipe 10.

[0059] Referring to Figure 2 and Figure 3 As shown in the drawings, in this embodiment, the lifting frame 5 is fixedly provided with a vertical plate 13 on one side, the vertical plate 13 is provided with a sliding groove 131, the moving plate 91 is fixedly provided with a positioning rod 14 on the side close to the vertical plate 13, and the end of the positioning rod 14 away from the moving plate 91 is slidably attached to the sliding groove 131.

[0060] Specifically, the rotation of the lead screw 12 drives the fixed plate 11 and the moving plate 91 to move up and down, and the moving plate 91 drives the positioning rod 14 to move up and down along the sliding groove 131 provided on the vertical plate 13 during the up and down movement, which can ensure that the moving plate 91 does not rotate during the up and down movement.

[0061] Referring to Figure 5 and Figure 8 As shown in the drawings, in this embodiment, a protection frame 15 is slidably arranged in the fixed frame 8, the feeding pipe 10 movably penetrates the protection frame 15, the protection frame 15 is movably connected with a rotating rod 16 at the top, the rotating rod 16 is threadedly connected with the protection frame 15, and the end of the rotating rod 16 away from the protection frame 15 is rotatably connected with the inner wall of the fixed frame 8.

[0062] Specifically, when the device is not in working state, the protection frame 15 covers the bottom of the feeding pipe 10 inside, which can protect the feeding pipe 10 from damage caused by external objects, and when it is necessary to use the feeding pipe 10 to add reagent into the reagent pipe, the rotating rod 16 is rotated, since the rotating rod 16 is threadedly connected with the protection frame 15, the rotation of the rotating rod 16 drives the protection frame 15 to move upwards along the fixed frame 8, so that the bottom of the feeding pipe 10 is exposed, facilitating the addition of reagent; similarly, when the device is not used, the rotating rod 16 is reversely rotated to realize the downward movement of the protection frame 15 to shield and protect the feeding pipe 10.

[0063] Referring to Figure 8 As shown in the drawings, in this embodiment, a horizontal rod 17 is movably arranged on one side of the fixed frame 8, and the horizontal rod 17 and the rotating rod 16 are drivingly connected through a bevel gear 18.

[0064] Specifically, the rotation of the cross bar 17 can realize the synchronous rotation of the rotating rod 16 through the transmission of the bevel gear 18, and the forward and reverse rotation of the rotating rod 16 can realize the up and down movement of the protection frame 15 along the fixed frame 8.

[0065] Referring to Figure 2 and Figure 8 shown, in this embodiment, the cross bar 17 is movably penetrated through the fixed frame 8 at one end away from the bevel gear 18 and is fixedly sleeved with a driving gear 19 at the other end, and the driving rack 20 is movably provided on one side of the vertical groove 92 and the inclined groove 93 of the moving plate 91, and the driving gear 19 is in meshing transmission with the driving rack 20.

[0066] Specifically, when the moving plate 91 moves upward, the fixed frame 8 and the feeding pipe 10 move away from each other, and the driving gear 19 moves relative to the vertical groove 92 and the inclined groove 93, and in the moving process, the driving gear 19 will mesh with the driving rack 20 to realize the rotation of the driving gear 19, which will drive the cross bar 17 and the bevel gear 18 to rotate, realize the rotation of the rotating rod 16, and drive the protection frame 15 to move upward, expose the bottom of the feeding pipe 10, and facilitate the addition of reagent; similarly, when the moving plate 91 moves downward, the feeding pipe 10 moves closer to each other, the rotating rod 16 reversely rotates, and the protection frame 15 moves downward to cover the bottom of the feeding pipe 10 inside, which protects the feeding pipe 10.

[0067] Referring to Figure 9 and Figure 10 shown, in this embodiment, the protection frame 15 is fixedly provided with a positioning plate 21 at one side of the bottom, and a round rod 22 is movably penetrated and arranged at the center of the positioning plate 21, and a cover plate 23 is fixedly arranged at one end of the round rod 22, and the cover plate 23 is movably abutted with the bottom of the protection frame 15.

[0068] Specifically, when the device is not used, the protection frame 15 covers the feeding pipe 10 inside, and the cover plate 23 is also flushly abutted with the bottom of the protection frame 15, which can avoid the accumulation of dust and other impurities outside the nozzle of the feeding pipe 10, causing pollution during the addition of reagent, and when the device needs to be used, the round rod 22 is rotated clockwise, and the clockwise rotation of the round rod 22 relative to the positioning plate 21 will drive the cover plate 23 to rotate clockwise, and the surface of the cover plate 23 is no longer abutted with the bottom of the protection frame 15, and then the upward movement of the protection frame 15 will expose the feeding pipe 10, which is convenient for adding reagent.

[0069] Referring to Figure 8 and Figure 10 shown, in this embodiment, the protection frame 15 is provided with a through slot 151 at one side, the through slot 151 is movably provided with a positioning rack 24, the top of the positioning rack 24 is fixedly connected with the inner wall of the top of the slot 81, and the positioning gear 25 is fixedly arranged at one end of the round rod 22 away from the cover plate 23, and the positioning gear 25 is in meshing transmission with the positioning rack 24.

[0070] Specifically, when the device is not in use, the protective frame 15 covers the feeding pipe 10 inside, the cover plate 23 is also flush with the bottom of the protective frame 15, and the rotation of the rotating rod 16 drives the protective frame 15 to move upwards, the positioning rack 24 moves downwards along the through slot 151 relative to the protective frame 15, and the positioning rack 24 is meshed with the positioning gear 25 during the upward movement of the protective frame 15. The clockwise rotation of the positioning gear 25 drives the circular rod 22 and the cover plate 23 to rotate 90 degrees clockwise, and the cover plate 23 changes from a horizontal state to a vertical state. Then, the protective frame 15 continues to move upwards, and the bottom of the feeding pipe 10 can be exposed, which facilitates the addition of reagents.

[0071] Referring to Figure 6 In this embodiment, the bottom of the protective frame 15 is provided with a horizontal slot 152, and a movable rod 26 is movably arranged in the horizontal slot 152. One end of the movable rod 26 is movably connected with a rotating plate 27, and the end of the rotating plate 27 away from the movable rod 26 is movably connected with the cover plate 23.

[0072] Specifically, the clockwise rotation of the circular rod 22 drives the cover plate 23 to flip, and the rotation of the cover plate 23 drives the rotating plate 27 to rotate, and the rotating plate 27 drives the movable rod 26 to move horizontally along the horizontal slot 152 during the rotation of the rotating plate 27, thereby improving the stability of the cover plate 23 during the flipping process.

[0073] Referring to Figure 6 and Figure 7 In this embodiment, the protective frame 15 is provided with a moving slot 153 above the horizontal slot 152, and a stop block 29 is movably arranged in the moving slot 153. The stop block 29 is fixedly connected between the top of the stop block 29 and the inner wall of the moving slot 153 through a spring 30. The stop block 29 is provided with a notch 291 at both ends, and the stop block 29 is movably abutted with the movable rod 26. The fixed frame 8 is fixedly provided with an abutting rod 31 on one side, and the abutting rod 31 is movably abutted with the stop block 29.

[0074] 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.

[0075] In this embodiment, a COD analyzer includes the above-mentioned solution injection and addition mechanism.

[0076] 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.

[0077] 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.

[0078] 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 bracket 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 movably through the inner wall of the top of the slot; An adjusting assembly, located inside the lifting frame, is used to drive the multiple feed pipes to move laterally. The adjusting assembly includes a moving plate with a vertical groove in its center and multiple axially symmetrical inclined grooves at both ends of the vertical groove, with the same number of inclined grooves on both sides. A limiting rod is fixedly installed on the side of the fixed frame near the moving plate, and the limiting rod is slidably connected to the vertical groove and the inclined grooves. A fixed plate is fixedly installed on the top side of the moving 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. A vertical plate is fixedly installed on one side of the lifting frame, and a sliding groove is formed 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 is slidably engaged with the sliding groove. A protective frame is slidably installed inside the fixed frame, and the feed pipes movably pass through the protective frame. A rotating rod is movably connected to the top of the protective frame. 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. A horizontal bar is movably connected through one side of the fixed frame. The horizontal bar and the rotating rod are connected via a bevel gear transmission. The end of the horizontal bar away from the bevel gear movably passes through the fixed frame, and a drive gear is fixedly sleeved at its end. A drive rack is fixedly installed on one side of the vertical groove and the inclined groove of the moving plate. The drive gear meshes with the drive rack for transmission. A positioning plate is fixedly installed on one side of the bottom of the protective frame. A round rod movably passes 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. A through groove is opened on one side of the protective frame. A positioning rack is movably installed 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 installed at the end of the round rod away from the cover plate, and the positioning gear meshes with the positioning rack for transmission.

2. The solution injection and addition mechanism according to claim 1, 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.

3. The solution injection and addition mechanism according to claim 2, 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.

4. A COD analyzer, characterized in that, It includes the solution injection and addition mechanism as described in any one of claims 1-3.

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