Device for detecting chemical oxygen demand of chemical wastewater

Abstract

The invention provides a chemical wastewater chemical oxygen demand detection device which structurally comprises a base, a fixing body, a detection box, pipe connecting pieces, a nitric oxide storage box and a debugging screen, the edge of the surface layer of the base is fixedly connected with the fixing body, the edge of the detection box is connected with the base through the fixing body, and the pipe connecting pieces are distributed on the right side and the lower layer center area of the detection box. The nitric oxide storage box is positioned at the upper end of the detection box; after the left side of the detection box is further improved, the detection box can control the position of the removal frame through the telescopic structures under the clamping of the newly added removal frame with the shape consistent with that of the inner wall of the detection box and four groups of telescopic structures, so that the removal frame can scrape corners of the inner wall of the detection box, and residual impurities can be treated; and therefore, the connecting firmness of the telescopic structure and the removing frame can be improved through the locking blocks of the sliding rods, and shaking instability generated in the moving process is avoided.

Description

Technical Field

[0001] This invention relates to the field of chemical wastewater detection technology, and more specifically to a device for detecting the chemical oxygen demand (COD) of chemical wastewater. Background Technology

[0002] Chemical wastewater is the wastewater discharged during the production of each chemical product, including process wastewater, cooling water, exhaust gas scrubbing water, equipment and pool flushing water, etc. The chemical oxygen demand (COD) of chemical wastewater is calculated by using chemical oxidants to oxidize and decompose oxidizable substances in the wastewater, and then calculating the oxygen consumption based on the amount of residual oxidant. Therefore, during the treatment of chemical wastewater, it is necessary to use a detection device to accurately calculate the chemical oxygen demand (COD) of the current chemical wastewater. This allows for the clear labeling of the wastewater's pollution indicators, enabling the determination of the pollution level of the current chemical wastewater based on the values ​​displayed by the detection device (a higher COD indicates more severe organic pollution of the water body). With the assistance of the detection device, the treatment effect of chemical wastewater can be improved. In summary, the inventors have found that existing detection devices have the following main defects: because chemical wastewater contains various solid and soft impurities, when it is introduced into the detection device for chemical oxygen demand (COD) detection, these impurities will accumulate on the inner wall and bottom corners of the detection device through sedimentation or adhesion. As a result, after the COD of the chemical wastewater is detected and discharged, a large amount of impurities will remain in the detection device, which will affect the detection accuracy and is not conducive to subsequent maintenance. Summary of the Invention

[0003] The technical solution adopted by the present invention to achieve the technical objective is: a chemical oxygen demand (COD) detection device for chemical wastewater, the structure of which includes: a base, a fixed body, a detection box, connecting pipes, a nitric oxide storage box, and a debugging screen. The surface edge of the base is fixedly connected to the fixed body, the edge of the detection box is connected to the base through the fixed body, the connecting pipes are distributed on the right side and the lower central area of ​​the detection box, the nitric oxide storage box is positioned at the upper end of the detection box, and the debugging screen is set at the center of the surface of the detection box and electrically connected.

[0004] As a further improvement of the present invention, the left side of the testing box is provided with an adapter slot, a solid block, a storage layer, a stirrer positioning block, a telescopic structure, and a removal frame. The adapter slot is located on the upper middle two sides of the solid block. The storage layer and the solid block are an integrated structure. The stirrer positioning block is installed in the central area of ​​the storage layer. The telescopic structure is located at the four ends of the surface edge of the storage layer and is spaced to fit the stirrer positioning block. The removal frame is connected to the telescopic structure, and the telescopic structure is electrically connected to the debugging screen of the testing box. The adapter slot is located at each end of the solid block edge. The surface of the storage layer is polished. The stirrer positioning block is circular and parallel to the storage layer. The telescopic structure is located at each of the four ends of the surface edge of the storage layer. The removal frame is square and has a hollowed-out center.

[0005] As a further improvement of the present invention, the telescopic structure includes an insert block, a parallel block, a connecting end, a control body, a slide rod, and a locking block. The insert block is welded to the lower end of the parallel block, and the upper part of the parallel block communicates with the connecting end. The edge of the control body and the connecting end are an integral structure. The slide rod is embedded in the central area of ​​the control body. The locking block is fixed to the upper end of the slide rod. The connecting end is electrically connected to the detection box via a spool. The slide rod is fixedly connected to the removal frame via the locking block. The insert block and the parallel block are perpendicular to each other. The connecting end is arc-shaped. The diameter of the control body is larger than the diameter of the slide rod, and the center contains a vertical slide rail. The surface of the slide rod edge is finely polished.

[0006] As a further improvement of the present invention, the connecting end is provided with an overlapping block, a protrusion, an anti-deformation body, a limiting ring, and a spool connecting end. The inner two sides of the overlapping block are fixedly connected to the protrusion. The anti-deformation body covers the center of the surface of the overlapping block through the protrusion. The limiting ring falls into the center of the surface of the anti-deformation body. The spool connecting end passes through the central area of ​​the anti-deformation body and the overlapping block through the limiting ring. The spool connecting end is set at the edge of the control body through the overlapping block. A protrusion is installed at the center of each of the two sides inside the overlapping block. The protrusions are distributed on both sides of the anti-deformation body. The anti-deformation body is made of carbon steel. There are three sets of limiting rings on the surface of the anti-deformation body.

[0007] As a further improvement of the present invention, the spool connecting end is provided with a reinforcing ring, a vertical sleeve, an airtight clamp, and a slot. The reinforcing ring is located at the outer center of the vertical strip. The airtight clamp is embedded in the inner region of the vertical sleeve and is at the same center point as it. The slot passes through the center region of the airtight clamp and is connected to it. The vertical sleeve is connected to the limiting ring through the reinforcing ring. The reinforcing ring is made of magnetic metal. The length of the vertical sleeve is the same as the length of the airtight clamp and the two are fitted together without gaps. The airtight clamp is made of rubber. The slot is opened in a vertical penetrating direction.

[0008] As a further improvement of the present invention, the stirrer positioning block is provided with a support column, a restraining block, a rotating shaft, a first rod, and a second rod. The top of the support column is connected to the restraining block. The rotating shaft is embedded in the top of the support column and positioned at the origin by the restraining block. The first rod is fixed to the edge area of ​​the rotating shaft and is movably connected. The second rod is fixedly connected to the edge of the first rod and is perpendicular to each other. The first and second rods are set at the internal center of the detection box through the rotating shaft and are spaced together. The length of the support column is half that of the detection box. The restraining block communicates with the inside of the detection box. The support column is a solid cylindrical shape. The restraining block is set at the top of the support column. The center of the rotating shaft contains a through groove. The first and second rods are provided in four sets on the edge of the rotating shaft.

[0009] As a further improvement of the present invention, the restraining block is provided with a rust-proof disc, a sliding layer, and a screw. The rust-proof disc and the sliding layer are an integrated structure. The screw is welded to the central area of ​​the rust-proof disc through the sliding layer and is perpendicular to each other. The length of the screw is two-thirds of the length of the support column. The rust-proof disc is made of stainless steel, and the sliding layer is finely polished.

[0010] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention further improves the left side of the detection box by adding a removal frame that matches the shape of the inner wall of the detection box and supporting four sets of telescopic structures. The detection box can control the position of the removal frame through the telescopic structure, so that the removal frame can scrape the corners of the inner wall of the detection box, so that residual impurities can be processed and prevent the accumulation of impurities from making subsequent cleaning difficult. Furthermore, the telescopic structure can use the locking block of the slide rod to improve the connection firmness with the removal frame and avoid wobbling and instability during the movement.

[0011] 2. After further improvement of the connection end, the hardness of the edge of the spool connection end can be improved by stacking and thickening the overlapping block and the anti-deformation body. This can prevent damage to the original shape of the slot edge caused by frequent disassembly and assembly of the power spool and prevent deformation. Then, the slot can improve the perpendicularity of the power cable insertion and the airtightness after connection by using the airtight sleeve and vertical sleeve on the edge, and prevent water molecules from invading and affecting normal power supply.

[0012] 3. With further improvements to the stirrer positioning block, the present invention ensures that the rotating shaft, rods one and two can be stably positioned in the central area of ​​the detection box by coordinating the length of the support column (half the length of the detection box). Then, the four-sided arrangement of the four sets of rods one and two can improve the uniformity of the fusion of chemical wastewater and nitric oxide, thereby further improving the detection accuracy of chemical wastewater. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a chemical oxygen demand (COD) detection device for chemical wastewater.

[0014] Figure 2 This is a three-dimensional structural diagram of the improved left side of a testing box.

[0015] Figure 3 This is a magnified three-dimensional structural diagram of an improved telescopic structure.

[0016] Figure 4 This is a cross-sectional structural diagram of an improved connection end.

[0017] Figure 5 This is a three-dimensional structural diagram of an improved spool connection end.

[0018] Figure 6 This is a three-dimensional structural diagram of an improved stirrer positioning block.

[0019] Figure 7 This is a schematic diagram of a three-dimensional structure of an improved restraint block.

[0020] In the diagram: Base-1, Fixing Body-2, Detection Box-3, Connecting Pipe-4, Nitric Oxide Storage Box-5, Debugging Screen-6, Adapter Slot-31, Solid Block-32, Shelf Layer-33, Stirrer Positioning Block-34, Telescopic Structure-35, Removal Frame-36, Insert Block-351, Parallel Block-352, Connecting End-353, Control Body-354, Slide Rod-355, Locking Block-356, Overlapping Block-a1, Protrusion-a2, Anti-Deformation Body-a3, Limiting Ring-a4, Spool Connecting End-a5, Reinforcing Ring-a51, Vertical Sleeve-a52, Airtight Jacket-a53, Slot-a54, Support Column-341, Restraining Block-342, Rotating Shaft-343, Rod No. 1-344, Rod No. 2-345, Rust-proof Disc-b1, Sliding Layer-b2, Screw-b3. Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings: Example

[0022] Figures 1 to 5 As shown: This invention provides a device for detecting the chemical oxygen demand (COD) of chemical wastewater. Its structure includes a base 1, a fixing body 2, a detection box 3, a connecting pipe 4, a nitric oxide storage box 5, and a debugging screen 6. The surface edge of the base 1 is fixedly connected to the fixing body 2. The edge of the detection box 3 is connected to the base 1 through the fixing body 2. The connecting pipe 4 is distributed on the right side and the lower center area of ​​the detection box 3. The nitric oxide storage box 5 is positioned at the upper end of the detection box 3. The debugging screen 6 is set at the center of the surface of the detection box 3 and is electrically connected.

[0023] The left side of the testing box 3 is provided with an adapter slot 31, a solid block 32, a storage layer 33, a stirrer positioning block 34, a telescopic structure 35, and a removal frame 36. The adapter slot 31 is located on the upper middle two sides of the solid block 32. The storage layer 33 and the solid block 32 are an integrated structure. The stirrer positioning block 34 is installed in the central area of ​​the storage layer 33. The telescopic structure 35 is located at the four ends of the surface edge of the storage layer 33 and is spaced to fit the stirrer positioning block 34. The removal frame 36 is connected to the telescopic structure 35. The telescopic structure 35 is electrically connected to the debugging screen 6 of the testing box 3. The adapter slot 31 is located at each end of the solid block 32. The surface of the storage layer 33 is polished. The stirrer positioning block 34 is circular and parallel to the storage layer 33. The telescopic structure 35 is located at each of the four ends of the surface edge of the storage layer 33. The removal frame 36 is square and has a hollow center. The adapter slots 31 improve the connection accuracy between the solid block 32 and the component by their quantity and location. The placement layer 33, through its flattened shape, avoids the defect that the stirrer positioning block 34 and the telescopic structure 35 cannot be on the same horizontal line after they are installed. The stirrer positioning block 34, through its shape and its parallelism with the placement layer 33, improves the fixing effect of the stirrer position. The telescopic structure 35, through its four-sided positioning, can lock the four ends of the removal frame 36, so that the removal frame 36 can fit with the inner layer of the component. The removal frame 36, based on its square shape, can be adapted to the internal shape of the component, and at the same time, its central hollowing out reduces its own space occupation area.

[0024] The telescopic structure 35 includes an insert block 351, a parallel block 352, a connecting end 353, a control body 354, a slide rod 355, and a locking block 356. The insert block 351 is welded to the lower end of the parallel block 352, and the upper part of the parallel block 352 communicates with the connecting end 353. The edge of the control body 354 and the connecting end 353 are integrated. The slide rod 355 is embedded in the central area of ​​the control body 354. The locking block 356 is fixed to the upper end of the slide rod 355. The connecting end 353 is electrically connected to the detection box 3 via a spool. The slide rod 355 is fixedly connected to the removal frame 36 via the locking block 356. The insert block 351 and the parallel block 352 are perpendicular to each other. The connecting end 353 is arc-shaped. The diameter of the control body 354 is larger than the diameter of the slide rod 355, and the center contains a vertical slide rail. The surface of the slide rod 355 is finely polished. The perpendicularity between the insert block 351 and the parallel block 352 improves the origin positioning effect of the control body 354. The connecting end 353, with its arc shape, can be adapted to the edge of the control body 354, thereby improving the overlap stability with the control body 354. The control body 354, with its large diameter, can cover the edge of the slide rod 355. At the same time, the internal vertical slide rail allows the slide rod 355 to move in a straight line. The slide rod 355, through fine polishing, can prevent jamming caused by sliding inside the control body 354.

[0025] The connecting end 353 is provided with an overlapping block a1, a protrusion a2, an anti-deformation body a3, a limiting ring a4, and a spool connecting end a5. The inner sides of the overlapping block a1 are fixedly connected to the protrusion a2. The anti-deformation body a3 covers the center of the surface of the overlapping block a1 through the protrusion a2. The limiting ring a4 falls into the center of the surface of the anti-deformation body a3. The spool connecting end a5 passes through the central area of ​​the anti-deformation body a3 and the overlapping block a1 through the limiting ring a4. The spool connecting end a5 is set on the edge of the control body 354 through the overlapping block a1. A protrusion a2 is installed at the center of each of the two sides inside the overlapping block a1. The protrusion a2 is distributed on both sides of the anti-deformation body a3. The anti-deformation body a3 is made of carbon steel. There are three sets of limiting rings a4 on the surface of the anti-deformation body a3. The two protrusions a2 inside the overlapping block a1 can determine the position of the anti-deformation body a3. The anti-deformation body a3 can improve the center hardness of the overlapping block a1 through its high hardness characteristics. The limiting ring a4 can limit the position of the spool connection end a5 according to the three sets of quantities.

[0026] The spool connecting end a5 is provided with a reinforcing ring a51, a vertical sleeve a52, an airtight clamp a53, and a slot a54. The reinforcing ring a51 is located at the outer center of the vertical strip a52. The airtight clamp a53 is embedded in the inner area of ​​the vertical sleeve a52 and is at the same center point as it. The slot a54 passes through the center area of ​​the airtight clamp a53 and is connected to it. The vertical sleeve a52 is connected to the limiting ring a4 through the reinforcing ring a51. The reinforcing ring a51 is made of magnetic metal. The length of the vertical sleeve a52 is the same as the length of the airtight clamp a53 and the two are fitted together without gaps. The airtight clamp a53 is made of rubber. The slot a54 is opened in a vertical penetrating direction. The reinforcing ring a51 enhances the vertical fixation effect of the vertical sleeve a52 through its magnetic attraction properties. The vertical sleeve a52 can overlap with the airtight jacket a53 through its own length, and the gapless fit can prevent water molecules from entering the combined area between the two. The airtight jacket a53 covers and wraps the connection area of ​​the spool through its rubber properties, improving the connection strength of the spool and enhancing the airtightness between the connections. The slot a54 allows the spool to be inserted in a straight line through its vertical opening.

[0027] The specific functions and operation procedures of this embodiment are as follows: In this invention, First: The chemical oxygen demand (COD) detection device for chemical wastewater can determine the position of the detection box 3 through the base 1 and the fixed body 2. After the detection box 3 is connected to the external power supply, the system can be adjusted using the debugging screen 6 on the surface. After the system is debugged, the detection box 3 can be connected to the external pipeline through the right connecting pipe 4. At the same time, the corresponding chemical wastewater is introduced into the detection box 3 through the pipeline. After receiving the chemical wastewater, the top nitric oxide storage tank 5 can discharge a certain amount of nitric oxide into the detection box 3 according to the program control, so that the chemical wastewater and nitric oxide in the detection box 3 can be mixed. After the oxides in the wastewater are reduced, the COD of the wastewater can be calculated. Finally, the detection box 3 can open the connecting pipe 4 in the lower central area to discharge the current chemical wastewater. Second: The solid block 32 on the left side of the test box 3 can be connected to the left base 1 and the fixed body 2 through the adapter grooves 31 at both ends, so that the test box 3 can be arranged in a horizontal straight line. Then, the flattened storage layer 33 of the solid block 32 can be connected to the stirrer positioning block 34 and the telescopic structure 35 in a parallel manner. As a result, the four sets of telescopic structures 35 located at the four ends of the storage layer 33 can fix the four ends of the square removal frame 36. For this purpose, the test box 3 can control the telescopic structure 35 through the adjustment plate 6, so that the telescopic structure 35 will control the position of the square removal frame 36 in a telescopic manner. Thus, the removal frame 36 will move in a translational manner in the inner layer area of ​​the test box 3. During the process, the removal frame 36 can scrape off and remove the impurities remaining in the corner area of ​​the inner layer of the test box 3, which can improve the convenience of subsequent cleaning of the inside of the test box 3, prevent the corners from being difficult to clean due to excessive accumulation of impurities, and affect the efficiency of subsequent maintenance. Third: The parallel block 352 of the telescopic structure 35 will be installed in parallel on the surface of the shelf layer 33 using the insert block 351. Then, the control body 354, which is perpendicular to each other, can be electrically connected to the detection box 3 through the edge connection end 353 and the spool. For this purpose, the control body 354 can control the movement direction of the slide rod 355 according to the vertical slide rail in the center area, so that the slide rod 355 will slide in a straight line. After the slide rod 355 extends out from the inside of the control body 354, it can drive the removal frame 36 to move through the locking block 356, thereby improving the control stability of the removal frame 36. Fourth: The connecting end 353 will be embedded into the edge area of ​​the control body 354 through the overlapping block a1. Then, the protrusions a2 on both sides inside the overlapping block a1 can determine the position of the anti-deformation body a3, so that the anti-deformation body a3 can cover the central area of ​​the overlapping block a1. Therefore, with the assistance of the carbon steel anti-deformation body a3, the central hardness and thickness of the overlapping block a1 can be improved. Subsequently, the three sets of limiting rings a4 on the surface of the anti-deformation body a3 can determine the position of the spool connecting end a5. Thus, the spool connecting end a5 is formed by penetrating the anti-deformation body a3 and the overlapping block a1. With the support of the overlapping block a1 and the carbon steel anti-deformation body a3, the edge deformation caused by frequent disassembly or replacement of the spool can be avoided, thereby improving the electrical stability of the control body 354. Fifth: The vertical sleeve a52 of the spool connection end a5 can use the magnetic reinforcement ring a51 to improve the connection stability between itself and the anti-deformation body a3 and the overlapping block a1. Furthermore, the airtight clamp a53 inside the vertical sleeve a52 can cover and clamp the spool of the slot a54 according to its own rubber material properties, thereby eliminating the assembly gap and improving the airtightness of the spool insertion and power transmission. This prevents water molecules from intruding and affecting the normal power transmission effect, indirectly improving the power safety factor of the internal components of the detection device. With the cooperation of the vertical sleeve a52, the spool can be inserted in a vertical position, enhancing the connection convenience between components. Example

[0028] Figures 6 to 7 As shown: This invention provides a device for detecting the chemical oxygen demand (COD) of chemical wastewater. Its structure includes a stirrer positioning block 34 with a support column 341, a restraining block 342, a rotating shaft 343, a first rod 344, and a second rod 345. The top of the support column 341 is connected to the restraining block 342. The rotating shaft 343 is embedded in the top of the support column 341 and positioned at the origin by the restraining block 342. The first rod 344 is fixed to the edge area of ​​the rotating shaft 343 and is movably connected. The second rod 345 is fixedly connected to the edge of the first rod 344 and interconnected. Vertically, the first and second rods 344 and 345 are set at the center of the inside of the detection box 3 via a pivot 343 and are spaced together. The length of the support column 341 is half that of the detection box 3. The restraining block 342 communicates with the inside of the detection box 3. The support column 341 is a solid cylindrical shape. The restraining block 342 is set at the top of the support column 341. The pivot 343 contains a through groove in the center. The first rod 344 and the second rod 345 are provided in four sets on the edge of the pivot 343. The support column 341, with its solid cylindrical shape, defines the usage area of ​​components such as the rotating shaft 343. The restraining block 342, located at the top of the support column 341, can fix the upper and lower layers of the rotating shaft 343, allowing the upper and lower layers of the rotating shaft 343 to achieve fixed-point rotation, as they are respectively limited by the restraining block 342 and the support column 341. The through groove in the center of the rotating shaft 343 allows the center of the restraining block 342 to pass through, thereby improving the ease of assembly between components. The first rod 344 and the second rod 345, in four sets, can improve the fusion efficiency of chemical wastewater and nitric oxide.

[0029] The restraining block 342 is provided with a rust-proof disc b1, a sliding layer b2, and a screw b3. The rust-proof disc b1 and the sliding layer b2 are an integrated structure. The screw b3 is welded to the central area of ​​the rust-proof disc b1 through the sliding layer b2 and is perpendicular to each other. The length of the screw b3 is two-thirds of the length of the support column 341. The rust-proof disc b1 is made of stainless steel, and the sliding layer b2 is finely polished. The rust-proof disc b1 prevents surface corrosion caused by continuous contact with water molecules through its rust-proof form, thereby extending its service life. The sliding layer b2 improves the smoothness of component rotation through its fine polishing form and prevents contact with the component from affecting its normal rotation.

[0030] The specific functions and operation procedures of this embodiment are as follows: In this invention, First: With the support of the solid support column 341 installed in the central area of ​​the stirrer positioning block 34, the support column 341 can use its own length (half the length of the detection box 3) to fix the position of the rotating shaft 343 in the central area of ​​the detection box 3. After the rotating shaft 343 is embedded in the top of the support column 341, the support column 341 will use the restraint block 342 to determine the position of the rotating shaft 343, so that the rotating shaft 343 can rotate in the center of the detection box 3. Then, the four sets of first rods 344 and second rods 345 installed on the edge of the rotating shaft 343 can drive the chemical wastewater to rotate at the origin through four-way positioning and mutual perpendicularity. As a result, under the stirring support of the first and second rods 344 and 345, the fusion efficiency and uniformity of nitric oxide and chemical wastewater can be improved (because it is located in the center of the detection box 3, it can evenly drive the chemical wastewater on both sides inside the detection box 3 to rotate), further improving the accuracy of the detection device in detecting the oxygen demand of chemical wastewater. Second: The rust-proof disc b1 of the restraining block 342 can contact the surface of the rotating shaft 343 through the finely polished sliding layer b2, so that the rust-proof disc b1 will not cause any obstruction to the rotation of the rotating shaft 343 after it is installed. At the same time, the screws b3 perpendicular to each other in the central area of ​​the rust-proof disc b1 can enter the interior of the support column 341 by means of their own length being two-thirds of the length of the support column 341. Then, the threaded locking can improve the position restraining effect of the rotating shaft 343 and prevent large-scale loosening and shaking during the rotation process, thereby improving the fusion stability of chemical wastewater and nitric oxide.

[0031] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solutions described in this invention, or by designing similar technical solutions by those skilled in the art under the inspiration of the technical solutions described in this invention, falls within the protection scope of this invention.

Claims

1. A chemical oxygen demand (COD) detection device for chemical wastewater, comprising: The base (1), the fixing body (2), the detection box (3), the connecting pipe (4), the nitric oxide storage box (5), and the debugging screen (6) are characterized in that: the surface edge of the base (1) is fixedly connected to the fixing body (2), the edge of the detection box (3) is connected to the base (1) through the fixing body (2), the connecting pipe (4) is distributed on the right side and the lower center area of ​​the detection box (3), the nitric oxide storage box (5) is positioned at the upper end of the detection box (3), and the debugging screen (6) is set at the center of the surface of the detection box (3) and electrically connected.

2. The chemical oxygen demand (COD) detection device for chemical wastewater according to claim 1, characterized in that: The left side of the test box (3) is provided with an adapter slot (31), a solid block (32), a storage layer (33), a stirrer positioning block (34), a telescopic structure (35), and a removal frame (36). The adapter slot (31) is located on the upper middle two sides of the solid block (32). The storage layer (33) and the solid block (32) are an integrated structure. The stirrer positioning block (34) is installed in the central area of ​​the storage layer (33). The telescopic structure (35) is located at the four ends of the surface edge of the storage layer (33) and is spaced to fit the stirrer positioning block (34). The removal frame (36) is connected to the telescopic structure (35). The telescopic structure (35) is electrically connected to the debugging screen (6) of the test box (3).

3. The chemical oxygen demand (COD) detection device for chemical wastewater according to claim 2, characterized in that: The telescopic structure (35) is provided with an insert block (351), a parallel block (352), a connecting end (353), a control body (354), a slide rod (355), and a locking block (356). The insert block (351) is welded to the lower end of the parallel block (352). The upper part of the parallel block (352) is connected to the connecting end (353). The edge of the control body (354) and the connecting end (353) are an integrated structure. The slide rod (355) is embedded in the central area of ​​the control body (354). The locking block (356) is fixed to the upper end of the slide rod (355). The connecting end (353) is electrically connected to the detection box (3) through a spool. The slide rod (355) is fixedly connected to the removal frame (36) through the locking block (356).

4. The chemical oxygen demand (COD) detection device for chemical wastewater according to claim 3, characterized in that: The connecting end (353) is provided with an overlapping block (a1), a protrusion (a2), an anti-deformation body (a3), a limiting ring (a4), and a spool connecting end (a5). The inner sides of the overlapping block (a1) are fixedly connected to the protrusion (a2). The anti-deformation body (a3) ​​covers the center of the surface of the overlapping block (a1) through the protrusion (a2). The limiting ring (a4) falls into the center of the surface of the anti-deformation body (a3). The spool connecting end (a5) passes through the central area of ​​the anti-deformation body (a3) ​​and the overlapping block (a1) through the limiting ring (a4). The spool connecting end (a5) is set on the edge of the control body (354) through the overlapping block (a1).

5. The chemical oxygen demand (COD) detection device for chemical wastewater according to claim 4, characterized in that: The spool connecting end (a5) is provided with a reinforcing ring (a51), a vertical sleeve (a52), an airtight jacket (a53), and a slot (a54). The reinforcing ring (a51) is located at the outer center of the vertical strip (a52). The airtight jacket (a53) is embedded in the inner area of ​​the vertical sleeve (a52) and is at the same center point as it. The slot (a54) passes through the center area of ​​the airtight jacket (a53) and is connected to it. The vertical sleeve (a52) is connected to the limiting ring (a4) through the reinforcing ring (a51).

6. The chemical oxygen demand (COD) detection device for chemical wastewater according to claim 2, characterized in that: The stirrer positioning block (34) is provided with a support column (341), a restraining block (342), a rotating shaft (343), a first rod (344), and a second rod (345). The top of the support column (341) is connected to the restraining block (342). The rotating shaft (343) is embedded in the top of the support column (341) and positioned at the origin by the restraining block (342). The first rod (344) is fixed to the edge area of ​​the rotating shaft (343) and is movably connected. The second rod (345) is fixedly connected to the edge of the first rod (344) and is perpendicular to each other. The first and second rods (344, 345) are set in the center of the inside of the detection box (3) through the rotating shaft (343) and are spaced together. The length of the support column (341) is half of the length of the detection box (3). The restraining block (342) is connected to the inside of the detection box (3).

7. The chemical oxygen demand (COD) detection device for chemical wastewater according to claim 6, characterized in that: The restraining block (342) is provided with a rust-proof disc (b1), a sliding layer (b2), and a screw (b3). The rust-proof disc (b1) and the sliding layer (b2) are an integrated structure. The screw (b3) is welded to the central area of ​​the rust-proof disc (b1) through the sliding layer (b2) and is perpendicular to each other. The length of the screw (b3) is two-thirds of the length of the support column (341).

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