A chemical wastewater detection interference removal pretreatment system

Abstract

The application belongs to the field of wastewater detection, and particularly relates to a chemical wastewater detection interference removal pretreatment system, which comprises a base and a vacuum box, a sample pipe is arranged in the vacuum box, an outer frame is arranged on the base and is clamped with the top of the vacuum box, a plurality of filter pipes with filter membranes arranged therein are arranged at the bottom of the outer frame, an inner frame is fixedly connected in the outer frame, a supporting plate is fixedly connected in the inner frame, a quantitative liquid supply structure is arranged on the supporting plate, and liquid is quantitatively added into the corresponding filter pipe under the action of the quantitative liquid supply structure. In the application, the staff only needs to control the reciprocating movement times of the liquid storage box through the second electric telescopic rod according to the total amount of liquid required at one time and the volume of the quantitative pipe, so that the number of times of adding liquid into the quantitative pipe by the liquid storage box can be adjusted, and a plurality of sample pipes filled with filtered liquid can be obtained at the same time, and the staff does not need to observe the liquid level in the sample pipe all the time.

Description

Technical Field

[0001] This invention belongs to the field of wastewater detection, and in particular relates to a pretreatment system for removing interfering substances in chemical wastewater detection. Background Technology

[0002] Direct discharge of chemical wastewater causes water pollution. Therefore, heavy metal testing and analysis are necessary before discharge to determine the types and concentrations of pollutants, providing data for subsequent wastewater treatment process design. Fine suspended particulate matter and colloidal interference in chemical wastewater can interfere with instrument detection; therefore, these interfering impurities must be removed before testing. Traditional filtration methods involve placing a filter membrane at the bottom opening of a single container. The liquid to be tested is added to the container, and the liquid passes through the filter membrane under gravity, while impurities are intercepted. Operators then use pipettes to add the filtered liquid to sample bottles according to experimental requirements. However, this method is time-consuming due to the high volume of liquids transferred individually. Another approach is negative pressure filtration. Multiple filter tubes with built-in filter membranes are installed in a vacuum chamber. The inlet of each filter tube is connected to the chamber containing the liquid to be tested via tubing. Several sample bottles are placed in the vacuum chamber to collect the filtered liquid, allowing for parallel control experiments. By evacuating the vacuum chamber, the pressure difference drives the test liquid in the chamber to flow through the corresponding pipeline into the filter tube. After being filtered by the filter membrane, the test liquid flows into the corresponding sample collection bottle. However, this negative pressure filtration mode still has significant shortcomings in practical applications. On the one hand, the existing equipment lacks a quantitative liquid dispensing device, relying entirely on manual operation, resulting in extremely low automation. When the filtrate in the sample collection bottle reaches the designated target level, the filtration should be stopped immediately. However, there is a delay in human reaction, making it impossible to accurately control the timing of shutdown. This often results in the liquid level in the sample collection bottle being higher than the preset level after the vacuum pump is turned off. On the other hand, if the staff leaves midway and forgets to turn off the vacuum pump, liquid will continuously flow into the sample collection bottle, causing filtrate to overflow. This not only directly wastes the test sample and contaminates the vacuum chamber, increasing the difficulty of equipment cleaning, but also renders the pretreatment work invalid, requiring resampling and filtration, significantly slowing down the overall detection progress and increasing experimental costs. Summary of the Invention

[0003] (a) Technical problems to be solved This invention provides a pretreatment system for removing interfering substances in chemical wastewater to solve the following problems.

[0004] 1. Lack of quantitative liquid dispensing device. When the filtrate in the sample collection bottle reaches the specified target liquid level, the vacuum pump needs to be shut down immediately. However, there is a problem of delayed reaction by the operator, which makes it impossible to shut down the pump in time. As a result, the liquid level in the sample collection bottle is often higher than the preset liquid level after the vacuum pump is turned off. 2. The entire filtration process requires real-time monitoring by staff. If left unattended, the filtrate is prone to overflow under the action of the vacuum pump, contaminating the vacuum chamber, increasing the difficulty of subsequent cleaning, and rendering the pretreatment work invalid. It is necessary to resample and filter, which increases the cost of the experiment.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: A pretreatment system for removing interfering substances in chemical wastewater includes a base and a quantitative liquid supply structure. An outer frame is slidably mounted on the base, and multiple filter tubes are provided at the bottom of the outer frame. Filter membranes are snapped into the filter tubes. The outer frame is equipped with a support plate. The metering liquid dispensing structure includes a liquid storage box, a limiting rail, and a metering tube. Multiple metering tubes corresponding to filter tubes are fixedly connected to the support plate. The liquid storage box is slidably connected to the support plate. A second electric telescopic rod is fixedly connected to the support plate. The telescopic end of the second electric telescopic rod is engaged with the outer wall of the liquid storage box. The bottom of the liquid storage box is provided with multiple drain ports corresponding to the metering tubes. The bottom of the liquid storage box is also provided with multiple cavities that are staggered with the drain ports. The metering tube is intermittently connected to the drain ports and cavities. There are two limiting rails, and the top of each rail is fixedly connected to the bottom of the support plate. The metering tube is located between the two limiting rails. Multiple blocking plates corresponding to the metering tubes are slidably connected between the two limiting rails. The bottom of the metering tube is in sliding contact with the blocking plates. The bottom of the liquid storage box is provided with multiple sets of push plates corresponding to the blocking plates. Multiple reset structures corresponding to the blocking plate are provided between the two limit rails.

[0006] Furthermore, the base is inverted T-shaped, and a first sliding groove is provided on the vertical section of the base. A sliding block is slidably connected in the first sliding groove. The outer frame is fixedly connected to one side of the sliding block. A first electric telescopic rod is also fixedly connected to the horizontal section of the base. The telescopic end of the first electric telescopic rod is fixedly connected to the bottom of the sliding block. The top of the horizontal section of the base is provided with a limiting slot, in which a vacuum box is movably engaged. The top of the vacuum box is open, and the inner wall of the vacuum box is fixedly connected to a first inner edge. The bottom of the outer frame is fixedly connected to a sealing strip, and the bottom of the outer frame is inserted into the top opening of the vacuum box, with the bottom of the sealing strip abutting against the top of the first inner edge. The vacuum chamber contains multiple sample tubes that correspond one-to-one with the filter tubes. An interface is provided on one side of the vacuum chamber, through which an external vacuum pump is connected.

[0007] Furthermore, multiple filter tubes are arranged in a straight line, with both the top and bottom of the filter tubes being open, and the top of the filter tubes being threadedly connected to the bottom of the outer frame. Multiple liquid storage funnels are fixed to the bottom of the inner wall of the outer frame. The filter tubes are set one-to-one with the liquid storage funnels and are connected to the corresponding liquid storage funnels. An air inlet is opened on the side wall of the outer frame, and a filter screen is fixed to the air inlet. The inner wall of the outer frame is fixed with a second inner edge, and the inner frame is detachably connected to the second inner edge. The top and bottom of the inner frame are open and the inner cavity of the inner frame is connected to the inner cavity of the outer frame. The support plate is detachably connected to the inner frame. A slot is provided on the outer wall of the liquid storage box. An alignment plate is fixedly connected to the telescopic end of the second electric telescopic rod. One end of the alignment plate is engaged with the slot. The top of the liquid storage box is open. Multiple partition plates are fixedly connected at equal intervals on the inner wall of the liquid storage box. The partition plates divide the interior of the liquid storage box into multiple chambers. The drain outlets are respectively located at the bottom of the chambers.

[0008] Furthermore, a second sliding groove is symmetrically provided on the support plate at the bottom of the liquid storage box. A number of inverted T-shaped limiting sliders are symmetrically fixed to the bottom of the liquid storage box. The vertical section of the limiting slider is slidably connected in the second sliding groove on the same side, and the top of the horizontal section of the limiting slider is slidably connected to the bottom of the support plate. The top and bottom of the metering tube are both open, with the top of the metering tube flush with the top of the support plate and the bottom extending below the support plate. The reset structure includes a limiting strip fixed between two limiting rails, an L-shaped blocking plate, a bottom of a metering tube that slides in contact with the top of the horizontal section of the blocking plate, a limiting rod fixed to the side of the blocking plate near the limiting strip, the limiting rod being slidably inserted into the limiting strip, the free end of the limiting rod passing through the limiting strip and having a limiting ring fixed to the end, and a first spring sleeved on the limiting rod, with both ends of the first spring abutting against the limiting strip and the blocking plate respectively.

[0009] Furthermore, the diameter of the opening at the top of the metering tube is smaller than that of the drain outlet; When the top opening of the metering tube is connected to the corresponding drain port, the horizontal section of the blocking plate blocks the bottom opening of the corresponding metering tube. When the top opening of the metering tube stops communicating with the corresponding drain port, the push plate contacts the corresponding plug plate. When the top opening of the metering tube is fully connected to the cavity, the horizontal section of the blocking plate stops sealing the bottom opening of the corresponding metering tube. A first rubber ring is fixed to the inner wall of the drain port, and the bottom of the first rubber ring slides in contact with the support plate. A second rubber ring is fixed to the inner wall of the bottom opening of the metering tube, and the bottom of the second rubber ring slides in contact with the top of the horizontal section of the block plate.

[0010] Furthermore, the multiple filter tubes at the bottom of the outer frame are arranged in two rows, and a sample bottle bottom plate is slidably connected in the vacuum chamber. The interface is located above the sample bottle bottom plate, and multiple mounting grooves corresponding to the filter tubes are opened on the top of the sample bottle bottom plate. A sample receiving tube is placed in each mounting groove. The support plate is symmetrically equipped with a metering liquid dispensing structure. The slots are located on the side of the two liquid storage boxes that are close to each other. The second electric telescopic rod is located between the two liquid storage boxes, and the two ends of the alignment plate are respectively engaged with the two slots.

[0011] Furthermore, multiple limiting guide posts are fixed to the bottom of the inner wall of the vacuum chamber, and the same sample bottle bottom plate is slidably set on the multiple limiting guide posts. A third electric telescopic rod is fixedly connected to the bottom of the inner wall of the vacuum chamber. The third electric telescopic rod is located below the bottom plate of the sample bottle, and the telescopic end of the third electric telescopic rod is fixedly connected to the bottom of the bottom plate of the sample bottle.

[0012] Furthermore, a cover plate is rotatably connected to the top of the outer frame via a connecting shaft; Both the vacuum chamber and the cover are transparent.

[0013] Furthermore, each of the multiple mounting grooves is fitted with a tension ring, and the center of the tension ring is provided with an insertion interface.

[0014] Furthermore, the power supply interfaces of the vacuum pump, the first electric telescopic rod, the second electric telescopic rod, and the third electric telescopic rod are all electrically connected to the external power supply equipment. The vacuum pump, the first electric telescopic rod, the second electric telescopic rod, and the third electric telescopic rod are all connected to the external control terminal via signal transmission.

[0015] (III) Beneficial Effects Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this invention, the operator only needs to control the number of reciprocating movements of the liquid storage box by the second electric telescopic rod according to the total amount of liquid required in a single operation and the volume of the metering tube itself. This allows for the corresponding adjustment of the number of times the liquid storage box adds liquid to the metering tube, thus obtaining multiple sample tubes containing filtered liquid at the same time. The entire process does not require the operator to constantly observe the liquid level in the sample tubes. The system allows staff to add different batches and types of water samples to different chambers as needed, thus completing the filtration of multiple batches of water samples at once and obtaining multiple different test samples. If the same water sample is added to multiple chambers, multiple sample collection tubes containing filtrate can be obtained simultaneously after filtration, facilitating subsequent comparative experiments of different batches of samples or parallel experiments of the same sample.

[0016] Second, in this invention, the air inlet hole can balance the internal air pressure of the outer frame with the external air pressure, and avoid the formation of negative pressure inside the outer frame, which would prevent the liquid in the liquid storage funnel and filter tube from flowing smoothly down through the filter membrane to complete the filtration operation. A filter screen is fixed on the air inlet hole to prevent external impurities from entering the outer frame along the air inlet hole. Meanwhile, after adding the specified number of times to the metering tube, the extension end of the second electric telescopic rod retracts to its maximum extent. At this time, the liquid storage box stops adding liquid to the metering tube, and the top and bottom openings of the metering tube are connected to the outside. If the filtration work is completed but the operator does not turn off the vacuum pump, only outside air will enter the vacuum chamber through the filter screen, the liquid storage funnel, and the filter tube in sequence, and then be pumped away by the vacuum pump. There is no need to worry about the filtrate overflowing.

[0017] Third, in this invention, when the top opening of the metering tube is connected to the corresponding drain port, the horizontal section of the blocking plate blocks the bottom opening of the corresponding metering tube. The blocking plate can limit the bottom of the metering tube, preventing the liquid from flowing out from the bottom of the metering tube during the process of adding liquid to the metering tube, thus making it impossible to complete the metering liquid dispensing work.

[0018] Fourth, in this invention, multiple reset structures corresponding to the blocking plate are provided between the two limiting rails. When the liquid needs to be added to the metering tube after it is discharged from the metering tube, the telescopic end of the second electric telescopic rod extends again. Before the drain port is connected to the metering tube, the set reset structure will drive the blocking plate to reset first, ensuring that the blocking plate blocks the bottom of the metering tube before the liquid flows into the metering tube.

[0019] Fifth, in this invention, the liquid storage funnel can be set to increase the liquid storage volume of the filter tube, thus preventing liquid from overflowing from the top of the filter tube when adding liquid.

[0020] VI. In this invention, the height of the sample bottle bottom plate can be adjusted by the third electric telescopic rod, thereby adapting to sample receiving tubes of different heights and avoiding excessive distance between the bottom of the sample receiving tube and the filter tube, which would cause splashing when the liquid falls.

[0021] VII. In this invention, the bottom of the vacuum chamber can be limited and positioned by the set limiting slot, ensuring that the bottom of the outer frame can be accurately engaged with the top of the vacuum chamber. A sealing strip is fixed to the bottom of the outer frame. When the outer frame is engaged with the vacuum chamber, the bottom of the sealing strip abuts against the top of the first inner edge, thereby sealing the top of the vacuum chamber through the outer frame. The sealing strip can further improve the sealing performance between the outer frame and the vacuum chamber. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the base, sliding block, and first electric telescopic rod in this invention; Figure 3 This is a bottom view of the outer frame in this invention; Figure 4 This is a partial cross-sectional view of the outer frame and the liquid storage funnel in this invention; Figure 5 This is a partial sectional view of the outer frame and inner frame in this invention; Figure 6 This is a schematic diagram of the structure of the second electric telescopic rod, the alignment plate, and the slot in this invention; Figure 7 This is a bottom view of the two metering liquid dispensing structures mounted on the support plate in this invention; Figure 8 for Figure 7 A magnified view of a portion of point A in the middle; Figure 9 This is a schematic diagram of the structure when the drain port is connected to the metering tube in this invention; Figure 10 for Figure 9 A magnified view of a portion of point B in the middle; Figure 11 for Figure 9 A magnified view of a portion of point C in the middle; Figure 12 This is a schematic diagram of the structure when the drain outlet is no longer connected to the metering tube in this invention; Figure 13 This is a schematic diagram of the structure when the cavity and the metering tube are connected in this invention; Figure 14 This is a partial cross-sectional view of the vacuum chamber and the bottom plate of the sample bottle in this invention; Figure 15 This is an exploded view of the sample bottle bottom plate and the narrowing ring in this invention.

[0023] In the diagram: 1. Base; 101. Limiting slot; 102. First sliding groove; 11. Sliding block; 12. First electric telescopic rod; 13. Cover plate; 131. Connecting shaft; 2. Vacuum chamber; 201. Interface; 21. First inner edge; 22. Limiting guide post; 3. Sample receiving tube; 4. Outer frame; 41. Sealing strip; 42. Liquid storage funnel; 43. Filter screen; 44. Second inner edge; 5. Filter tube; 6. Filter membrane; 7. Inner frame; 71. Liquid storage box; 7101. Drain port; 7102. Cavity; 7103. Locking mechanism 711. Groove; 72. Divider plate; 721. Limiting rail; 73. Limiting strip; 74. Quantitative tube; 75. Blocking plate; 76. Limiting rod; 77. Push plate; 78. Limiting slider; 79. Limiting ring; 70. First spring; 71. Second electric telescopic rod; 72. Alignment plate; 73. First rubber ring; 8. Second rubber ring; 94. Support plate; 80. Second slide groove; 91. Sample bottle bottom plate; 910. Installation groove; 92. Third electric telescopic rod; 93. Retraction ring; 930. Insertion interface. Detailed Implementation

[0024] 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, and 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.

[0025] Example 1 like Figures 1-15 As shown, a pretreatment system for removing interfering substances in chemical wastewater includes a base 1 and a quantitative liquid supply structure. An outer frame 4 is slidably mounted on the base 1, and multiple filter tubes 5 are provided at the bottom of the outer frame 4. The top and bottom of the filter tubes 5 are open, and a filter membrane 6 is snapped into the filter tube 5. The water sample to be tested is added into the filter tube 5 through the top opening. The water sample passes through the filter membrane 6 under its own gravity and is discharged from the bottom opening of the filter tube 5. The filter membrane 6 can intercept impurities such as suspended particulate matter and colloidal interfering substances in the liquid. If the suspended solids content of the water sample is too high, it can be pre-filtered with external qualitative filter paper before being added to the filter tube 5 to avoid clogging of the filter membrane 6.

[0026] like Figures 4-13 As shown, a support plate 8 is installed in the outer frame 4. The quantitative liquid dispensing structure includes a liquid storage box 71, a limiting rail 72, and a quantitative tube 73. Multiple quantitative tubes 73 corresponding to the filter tube 5 are fixedly connected to the support plate 8. The top and bottom of the quantitative tubes 73 are open. The liquid storage box 71 is slidably connected to the support plate 8. A second electric telescopic rod 79 is fixedly connected to the support plate 8. The telescopic end of the second electric telescopic rod 79 is engaged with the liquid storage box 71. The bottom of the liquid storage box 71 is provided with multiple drain ports 7101 corresponding to the quantitative tubes 73. The bottom of the liquid storage box 71 is also provided with multiple cavities 7102 that are staggered with the drain ports 7101. The quantitative tubes 73 are intermittently connected to the drain ports 7101 and the cavities 7102. Two limiting rails 72 are provided, and their tops are fixedly connected to the bottom of the support plate 8. The bottom of the metering tube 73 extends to the bottom of the support plate 8 and is located between the two limiting rails 72. Multiple blocking plates 74 corresponding to the metering tube 73 are slidably connected between the two limiting rails 72. The bottom of the metering tube 73 slides in contact with the blocking plates 74. The bottom of the liquid storage box 71 is provided with multiple sets of push plates 75 corresponding to the blocking plates 74. The liquid storage box 71 can be pulled back and forth on the support plate 8 by the provided second electric telescopic rod 79. During the process of adjusting the extension stroke of the extension end of the second electric telescopic rod 79, when liquid needs to be added to the metering tube 73, the extension end of the second electric telescopic rod 79 extends and pushes the liquid storage box 71. At this time, the top opening of the metering tube 73 gradually approaches and connects with the corresponding drain port 7101. Figure 9As shown, the top opening diameter of the metering tube 73 is smaller than that of the drain port 7101, thus reducing the difficulty of aligning the metering tube 73 with the drain port 7101. The liquid in the storage box 71 flows into the metering tube 73 through the drain port 7101, adding liquid to the metering tube 73. When the top opening of the metering tube 73 is completely inside the drain port 7101, the communication area between the metering tube 73 and the drain port 7101 is at its maximum, and the liquid flow rate is at its maximum. At this time, the horizontal section of the blocking plate 74 blocks the bottom opening of the corresponding metering tube 73. The blocking plate 74 can limit the bottom of the metering tube 73, preventing liquid from flowing out from the bottom of the metering tube 73 during the process of adding liquid to the metering tube 73, which would prevent the metering operation from being completed. After the liquid fills the metering tube 73, the telescopic end of the second electric telescopic rod 79 begins to retract, simultaneously pulling the liquid storage box 71 to move in the opposite direction. At this time, the communication area between the metering tube 73 and the drain port 7101 gradually decreases. When the top opening of the metering tube 73 stops communicating with the corresponding drain port 7101, the liquid addition stops. At the same time, the push plate 75 contacts the corresponding blocking plate 74. As the liquid storage box 71 continues to move in the opposite direction, the metering tube 73 gradually communicates with the corresponding cavity 7102. Simultaneously, the liquid storage box 71 also pushes the blocking plate 74 through the push plate 75. When the top opening of the metering tube 73 is fully connected to the cavity 7102, the horizontal section of the blocking plate 74 stops sealing the bottom opening of the corresponding metering tube 73. At this time, the telescopic end of the second electric telescopic rod 79 retracts to its maximum extent. The top and bottom openings of the metering tube 73 are now in a conductive state, and the liquid in the metering tube 73 will automatically drain downwards, adding the liquid quantitatively to the corresponding filter tube 5.

[0027] The quantitative tube 73 can be selected from, but is not limited to, 1mL, 2mL, and 5mL volumes. The operator can adjust the number of times the liquid storage box 71 is added to the quantitative tube 73 by controlling the reciprocating movement of the second electric telescopic rod 79 according to the total amount of liquid required in a single operation and the volume of the quantitative tube 73 itself. For example, if the sample tube 3 requires 10mL of filtrate, and the quantitative tube 73 has a volume of 1mL, then it only needs to be added 10 times; if the quantitative tube 73 has a volume of 2mL, then it only needs to be added 5 times; and if the quantitative tube 73 has a volume of 5mL, then it only needs to be added 2 times.

[0028] Multiple reset structures corresponding to the blocking plate 74 are provided between the two limit rails 72. When liquid needs to be added to the metering tube 73 again after it is discharged from the metering tube 73, the telescopic end of the second electric telescopic rod 79 extends again and repeats the above steps. Before the drain port 7101 is connected to the metering tube 73, the set reset structure will drive the blocking plate 74 to reset first, ensuring that the blocking plate 74 blocks the bottom of the metering tube 73 before the liquid flows into the metering tube 73.

[0029] Furthermore, such as Figures 5-8 As shown, a second sliding groove 801 is symmetrically provided on the plate body of the support plate 8 at the bottom of the liquid storage box 71. A plurality of inverted T-shaped limiting sliders 76 are symmetrically fixed to the bottom of the liquid storage box 71. The vertical section of the limiting slider 76 is slidably connected in the second sliding groove 801 on the same side, and the top of the horizontal section of the limiting slider 76 is slidably connected to the bottom of the support plate 8. The second sliding groove 801 can limit the limiting slider 76 to ensure that the liquid storage box 71 will not deviate when sliding on the support plate 8. The top of the metering tube 73 is flush with the top of the support plate 8 to avoid the top of the metering tube 73 being higher than the top of the support plate 8, which would hinder the movement of the liquid storage box 71; or the top of the metering tube 73 being lower than the top of the support plate 8, which would cause a depression to form between the metering tube 73 and the support plate 8, resulting in some liquid being retained in the depression.

[0030] The reset structure includes a limiting strip 721 fixed between two limiting rails 72, an L-shaped blocking plate 74, and a bottom of a metering tube 73 that slides in contact with the top of the horizontal section of the blocking plate 74. A limiting rod 741 is fixedly connected to the side of the blocking plate 74 near the limiting strip 721. The limiting rod 741 is slidably inserted into the limiting strip 721. The free end of the limiting rod 741 passes through the limiting strip 721 and is fixedly connected to a limiting ring 77 at its end to prevent the limiting rod 741 from detaching from the limiting strip 721. A first spring 78 is sleeved on the limiting rod 741, with its two ends... Do not abut against the limit bar 721 and the blocking plate 74. During the retraction of the extension end of the second electric telescopic rod 79, when the top opening of the metering tube 73 stops communicating with the corresponding drain port 7101, the push plate 75 contacts the corresponding blocking plate 74. As the storage box 71 continues to move in the opposite direction, the storage box 71 will push the blocking plate 74 through the push plate 75. At this time, the blocking plate 74 will move away from the corresponding metering tube 73, so that the horizontal section of the blocking plate 74 stops sealing the bottom opening of the corresponding metering tube 73. At the same time, the first spring 78 is compressed. When a second liquid addition is required to the metering tube 73, the telescopic end of the second electric telescopic rod 79 extends again, pushing the liquid storage box 71 to reset. When the liquid storage box 71 resets with the push plate 75, the pushing force of the push plate 75 on the blocking plate 74 disappears. At this time, the first spring 78, which is in a compressed state, will stretch and reset, thereby pushing the blocking plate 74 to reset and blocking the bottom opening of the metering tube 73.

[0031] Furthermore, the base 1 is in the shape of an inverted T. A first sliding groove 102 is provided on the vertical section of the base 1. A sliding block 11 is slidably connected in the first sliding groove 102. The outer frame 4 is fixedly connected to one side of the sliding block 11. A first electric telescopic rod 12 is also fixedly connected to the horizontal section of the base 1. The telescopic end of the first electric telescopic rod 12 is fixedly connected to the bottom of the sliding block 11. like Figure 1 and Figure 2As shown, the top of the horizontal section of the base 1 is provided with a limiting slot 101, in which the vacuum box 2 is movably engaged. The limiting slot 101 limits the bottom of the vacuum box 2 and positions it, ensuring that the bottom of the outer frame 4 can precisely engage with the top of the vacuum box 2. Figure 3 and Figure 14 The top of the vacuum chamber 2 is open. The inner wall of the vacuum chamber 2 is fixed with a first inner edge 21, and the bottom of the outer frame 4 is fixed with a sealing strip 41. When the two are engaged, the sliding block 11 is driven to slide down along the first sliding groove 102 by the telescopic end of the first electric telescopic rod 12. The sliding block 11 drives the outer frame 4 to move down together. At this time, the bottom of the outer frame 4 is inserted into the top opening of the vacuum chamber 2, and the top of the vacuum chamber 2 is sealed by the outer frame 4. At this time, the bottom of the sealing strip 41 abuts against the top of the first inner edge 21. The sealing strip 41 can further improve the sealing between the outer frame 4 and the vacuum chamber 2.

[0032] The vacuum chamber 2 contains multiple sample collection tubes 3 that correspond one-to-one with the filter tubes 5. The liquid discharged from the bottom opening of the filter tubes 5 will flow into the sample collection tubes 3 for collection.

[0033] Furthermore, the vacuum chamber 2 is transparent so that staff can observe the liquid level in the sample tube 3, such as... Figure 1 As shown, an interface 201 is provided on one side of the vacuum chamber 2. An external vacuum pump is connected to the vacuum chamber 2 through the interface 201. The external vacuum pump removes the air inside the vacuum chamber 2, creating a negative pressure inside, thereby accelerating the speed at which the liquid in the filter tube 5 passes through the filter membrane 6 and flows into the sample receiving tube 3 along the bottom opening of the filter tube 5. Furthermore, such as Figure 3 and Figure 4 As shown, multiple filter tubes 5 are arranged in a straight line. The top of the filter tube 5 is threaded to the bottom of the outer frame 4 so that the filter tube 5 can be removed from the outer frame 4 during subsequent cleaning. Multiple liquid storage funnels 42 are fixed to the bottom of the inner wall of the outer frame 4. The filter tube 5 and the liquid storage funnel 42 are arranged in a one-to-one correspondence and are connected to the corresponding liquid storage funnel 42. The liquid storage funnel 42 can increase the liquid storage capacity of the filter tube 5 and prevent liquid from overflowing from the top of the filter tube 5 when adding liquid to the filter tube 5.

[0034] Under the action of the external vacuum pump, the liquid in the liquid storage funnel 42 and the filter tube 5 is filtered by the filter membrane 6 and discharged from the bottom opening of the filter tube 5. At the same time, the inside of the outer frame 4 is also in a negative pressure state. An air inlet is provided on the side wall of the outer frame 4. The air inlet can balance the air pressure inside the outer frame 4 with the outside air pressure, and prevent the formation of negative pressure inside the outer frame 4, which would prevent the liquid in the liquid storage funnel 42 and the filter tube 5 from flowing down smoothly through the filter membrane 6 to complete the filtration operation. A filter screen 43 is fixed on the air inlet to prevent external impurities from entering the outer frame 4 along the air inlet.

[0035] After the specified number of times liquid is added to the quantitative tube 73, the extension end of the second electric telescopic rod 79 retracts to its maximum extent and remains stationary. At this time, the liquid storage box 71 stops adding liquid to the quantitative tube 73, and the top and bottom openings of the quantitative tube 73 are connected to the outside. If the filtration work is completed but the operator does not turn off the vacuum pump, no liquid will flow into the vacuum chamber 2 through the filter tube 5 because the liquid storage box 71 stops adding liquid to the quantitative tube 73. Only outside air will enter the vacuum chamber 2 through the filter screen 43, the liquid storage funnel 42, and the filter tube 5 in sequence, and then be pumped away by the vacuum pump. The entire filtration process does not require the operator to constantly observe the liquid level in the sample tube, nor is there any need to worry about the filtrate overflowing.

[0036] Furthermore, the top of the liquid storage box 71 is open to facilitate the addition of the test liquid into the liquid storage box 71. A slot 7103 is provided on the outer wall of the liquid storage box 71. An alignment plate 791 is fixedly connected to the telescopic end of the second electric telescopic rod 79. One end of the alignment plate 791 is engaged with the slot 7103. When the telescopic end of the second electric telescopic rod 79 extends or retracts, the liquid storage box 71 can be moved together through the alignment plate 791. At the same time, it is not necessary to fix the liquid storage box 71 to the telescopic end of the second electric telescopic rod 79, which facilitates disassembly later. like Figure 9 As shown, multiple partition plates 711 are fixedly attached to the inner wall of the storage box 71 at equal intervals. During filtration, the partition plates 711 divide the interior of the storage box 71 into multiple chambers. Drain ports 7101 are respectively located at the bottom of the chambers. Operators can add different batches and types of water samples to different chambers as needed, thus completing the filtration of multiple batches of water samples at once and obtaining multiple different test samples. If the same water sample is added to multiple chambers, multiple sample collection tubes 3 containing filtrate can be obtained simultaneously after filtration, improving work efficiency and facilitating subsequent comparative experiments of different batches of samples or parallel experiments of the same sample.

[0037] It should be noted that during subsequent cleaning, the cleaning personnel will pour out the remaining water sample to be tested from the storage box 71, raise the outer frame 4 using the first electric telescopic rod 12, remove the filter membrane 6 and vacuum box 2, place an external waste liquid collection cylinder (not shown in the figure) in the limiting slot 101, pour the cleaning solution into the storage box 71, and then activate the second electric telescopic rod 79. The second electric telescopic rod 79 will drive the storage box 71 to move back and forth, allowing the cleaning solution to flow sequentially through the storage box 71, the metering tube 73, the liquid storage funnel 42, and the filter tube 5 to clean the inner wall. The cleaned liquid will be discharged from the bottom opening of the filter tube 5 into the waste liquid collection cylinder for collection. Furthermore, a second inner edge 44 is fixed to the inner wall of the outer frame 4, and an inner frame 7 is detachably connected to the second inner edge 44 by screws. The second inner edge 44 can support the bottom of the inner frame 7. The second inner edge 44 and the inner frame 7 are detachably connected to facilitate the separation of the outer frame 4 and the inner frame 7 in the future, and further cleaning of the liquid storage funnel 42. The top and bottom of the inner frame 7 are open and the inner cavity of the inner frame 7 is connected to the inner cavity of the outer frame 4. The support plate 8 is detachably connected to the inner frame 7 by screws, so that the support plate 8 can be removed from the inner frame 7 for later maintenance or cleaning, and further cleaning of the liquid storage box 71 and the metering tube 73.

[0038] Furthermore, such as Figures 9-11 As shown, a first rubber ring 710 is fixedly connected to the inner wall of the drain port 7101. The bottom of the first rubber ring 710 slides in contact with the support plate 8. The first rubber ring 710 can further improve the sealing between the drain port 7101 and the support plate 8. A second rubber ring 720 is fixedly connected to the inner wall of the bottom opening of the metering tube 73. The bottom of the second rubber ring 720 slides in contact with the top of the horizontal section of the block plate 74. The second rubber ring 720 can further improve the sealing between the bottom opening of the metering tube 73 and the horizontal section of the block plate 74. The first rubber ring 710 and the second rubber ring 720 can be made of fluororubber rings that are resistant to acid and alkali corrosion, including but not limited to those.

[0039] Furthermore, such as Figure 3 As shown, the multiple filter tubes 5 at the bottom of the outer frame 4 are arranged in two rows, as follows: Figure 14 and Figure 15As shown, a sample bottle bottom plate 91 is slidably connected in the vacuum chamber 2. The interface 201 is located above the sample bottle bottom plate 91. Multiple mounting grooves 9101 are provided on the top of the sample bottle bottom plate 91. The multiple mounting grooves 9101 are divided into two rows and symmetrically distributed along the length of the sample bottle bottom plate 91. Each mounting groove 9101 contains a sample receiving tube 3. Correspondingly, a quantitative liquid dispensing structure is symmetrically arranged on the support plate 8. Compared with the original single-row arrangement, setting two rows of sample receiving tubes 3 can further increase the number of samples obtained and improve work efficiency. The slot 7103 is opened on the side of the two liquid storage boxes 71 that are close to each other. The second electric telescopic rod 79 is located between the two liquid storage boxes 71, and the two ends of the alignment plate 791 are respectively inserted into the two slots 7103. Thus, the two liquid storage boxes 71 can be moved synchronously at the same time by one second electric telescopic rod 79, providing power to the two liquid storage boxes 71.

[0040] Furthermore, such as Figure 14 As shown, multiple limiting guide posts 22 are fixed to the bottom of the inner wall of the vacuum chamber 2, and the same sample bottle bottom plate 91 is slidably arranged on the multiple limiting guide posts 22. A third electric telescopic rod 92 is fixedly connected to the bottom of the inner wall of the vacuum chamber 2. The third electric telescopic rod 92 is located below the sample bottle bottom plate 91, and the telescopic end of the third electric telescopic rod 92 is fixedly connected to the bottom of the sample bottle bottom plate 91. The telescopic end of the third electric telescopic rod 92 can drive the sample bottle bottom plate 91 to move up and down to adjust the height of the sample bottle bottom plate 91, thereby adapting to sample tubes 3 of different heights. This avoids the distance between the bottom of the sample tube 3 and the filter tube 5 being too large, which would cause splashing when the liquid falls. The limiting guide post 22 can limit the sample bottle bottom plate 91 to prevent it from tilting.

[0041] Furthermore, a cover plate 13 is rotatably connected to the top of the outer frame 4 via a connecting shaft 131. The cover plate 13 can cover the top of the outer frame 4 to prevent external impurities from falling into the outer frame 4, inner frame 7, and liquid storage box 71. When adding the water sample to be tested into the liquid storage box 71, the cover plate 13 is flipped to rotate and open along the axis of the connecting shaft 131, so that the water sample to be tested can be added into the liquid storage box 71. The cover plate 13 is transparent so that the staff can observe the remaining amount of water sample to be tested in the liquid storage box 71 and make it convenient for the staff to replenish the water sample to be tested.

[0042] As an optional implementation method, such as Figure 15 As shown, each of the multiple mounting grooves 9101 has a shortening ring 93 inserted into it. The center of the shortening ring 93 is provided with an insertion interface 9301. If a sample tube 3 with a diameter smaller than that of the mounting groove 9101 is selected, the operator can place a shortening ring 93 into the mounting groove 9101 to reduce the groove diameter of the mounting groove 9101. The operator can then insert the sample tube 3 into the insertion interface 9301.

[0043] Among them, the shrinkage ring 93 can be made of polyethylene foam, including but not limited to polyethylene foam. Polyethylene foam is lightweight, easy to process and mold, and has low manufacturing cost.

[0044] Furthermore, the vacuum pump, the first electric telescopic rod 12, the second electric telescopic rod 79, and the third electric telescopic rod 92 are all electrically connected to external power supply equipment, including but not limited to power strips, to provide power to the vacuum pump, the first electric telescopic rod 12, the second electric telescopic rod 79, and the third electric telescopic rod 92. The working principles of the first electric telescopic rod 12, the second electric telescopic rod 79, and the third electric telescopic rod 92 are all existing technologies and will not be described in detail here. Staff can purchase them from the market according to their actual needs. The vacuum pump, the first electric telescopic rod 12, the second electric telescopic rod 79, and the third electric telescopic rod 92 are all connected to an external control terminal via signal transmission, so that the staff can uniformly adjust the extension stroke of the first electric telescopic rod 12, the second electric telescopic rod 79, and the third electric telescopic rod 92 or the suction pressure of the vacuum pump. The external control terminal includes, but is not limited to, mobile phones, computers, or control hosts.

[0045] In summary, the workflow of this invention is as follows: S100: Before operation, place the sample receiving tube 3 in the mounting groove 9101, then snap the vacuum box 2 into the limiting slot 101, connect it to the external vacuum pump through the interface 201, turn on the first electric telescopic rod 12, and drive the sliding block 11 to slide down along the first sliding groove 102 through the telescopic end of the first electric telescopic rod 12. The sliding block 11 drives the outer frame 4 to move down together, so that the bottom of the sealing strip 41 abuts against the top of the first inner edge 21. Then open the cover plate 13, pour one or more water samples to be tested into each chamber as needed, then close the cover plate 13 and turn on the vacuum pump and the second electric telescopic rod 79. S200: When liquid is added to the metering tube 73, the telescopic end of the second electric telescopic rod 79 extends and pushes the liquid storage box 71. At this time, the top opening of the metering tube 73 gradually approaches and connects with the corresponding drain port 7101. The liquid in the liquid storage box 71 flows into the metering tube 73 through the drain port 7101, adding liquid to the metering tube 73. At this time, the horizontal section of the blocking plate 74 blocks the bottom opening of the corresponding metering tube 73. After the liquid fills the metering tube 73, the telescopic end of the second electric telescopic rod 79 begins to retract, simultaneously pulling the liquid storage box 71 to move in the opposite direction. At this time, the communication area between the metering tube 73 and the drain port 7101 gradually decreases. When the top opening of the metering tube 73 stops communicating with the corresponding drain port 7101, the liquid addition stops. At the same time, the push plate 75 contacts the corresponding blocking plate 74. As the liquid storage box 71 continues to move in the opposite direction, the metering tube 73 gradually communicates with the corresponding cavity 7102. Simultaneously, the liquid storage box 71 also pushes the blocking plate 74 through the push plate 75. When the top opening of the metering tube 73 is fully connected to the cavity 7102, the horizontal section of the blocking plate 74 stops sealing the bottom opening of the corresponding metering tube 73. At this time, the telescopic end of the second electric telescopic rod 79 retracts to its maximum extent. The top and bottom openings of the metering tube 73 are now in a conductive state, and the liquid in the metering tube 73 will automatically drain downwards, adding the liquid quantitatively to the corresponding filter tube 5. Under the action of the vacuum pump, a negative pressure is generated inside the vacuum chamber 2. The liquid in the liquid storage funnel 42 and the filter tube 5 is filtered by the filter membrane 6 and discharged from the bottom opening of the filter tube 5 into the corresponding sample receiving tube 3. S300: During the filtration process, when a second liquid addition is required to the metering tube 73, the extension end of the second electric telescopic rod 79 shall be re-operated according to the above step S200. When the liquid storage box 71 is reset with the push plate 75, the pushing force of the push plate 75 on the blocking plate 74 disappears. At this time, the first spring 78, which is in a compressed state, will stretch and reset, thereby pushing the blocking plate 74 to reset and re-block the bottom opening of the metering tube 73, so as to prevent the liquid from flowing out from the bottom of the metering tube 73 during the process of adding liquid to the metering tube 73.

[0046] Repeat steps S200 and S300 to continuously and quantitatively deliver liquid to filter tube 5 through metering tube 73. (The operator can adjust the number of times the storage box 71 is added to metering tube 73 by controlling the reciprocating movement of the second electric telescopic rod 79 according to the total amount of liquid required per cycle and the volume of metering tube 73 itself. For example, if sample tube 3 requires 10 mL of filtrate, and metering tube 73 has a volume of 1 mL, then it only needs to be added 10 times; if metering tube 73 has a volume of 2 mL, then it only needs to be added 5 times; if metering tube 73 has a volume of 5 mL, then it only needs to be added 2 times.) The entire process does not require the operator to constantly observe the liquid level in the sample tube. After adding the specified number of times to metering tube 73, the storage box 71 stops adding liquid to metering tube 73. If the filtration process is completed but the vacuum pump is not turned off by the staff, no more liquid will flow into the vacuum chamber 2 because the liquid storage box 71 stops adding liquid to the metering tube 73. Only outside air will enter the vacuum chamber 2 through the filter screen 43, the liquid storage funnel 42, and the filter tube 5 in sequence, and then be pumped away by the vacuum pump. There is no need to worry about the filtrate overflowing.

[0047] However, as is well known to those skilled in the art, the working principles and wiring methods of the vacuum pump, the first electric telescopic rod 12, the second electric telescopic rod 79, and the third electric telescopic rod 92 are commonplace and belong to conventional means or common knowledge. Therefore, they will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pretreatment system for removing interfering substances in chemical wastewater detection, characterized in that: It includes a base (1) and a metering liquid dispensing structure. An outer frame (4) is slidably provided on the base (1). Multiple filter tubes (5) are provided at the bottom of the outer frame (4). A filter membrane (6) is snapped into the filter tube (5). The outer frame (4) is equipped with a support plate (8). The quantitative liquid dispensing structure includes a liquid storage box (71), a limiting rail (72), and a quantitative tube (73). Multiple quantitative tubes (73) corresponding to the filter tube (5) are fixedly connected to the support plate (8). The liquid storage box (71) is slidably connected to the support plate (8). A second electric telescopic rod (79) is fixedly connected to the support plate (8). The telescopic end of the second electric telescopic rod (79) is engaged with the outer wall of the liquid storage box (71). The bottom of the liquid storage box (71) is provided with multiple drain ports (7101) corresponding to the quantitative tubes (73). The bottom of the liquid storage box (71) is also provided with multiple... A cavity (7102) is staggered with the drain port (7101), and the metering tube (73) is intermittently connected to the drain port (7101) and the cavity (7102); there are two limiting rails (72), and the top of each one is fixed to the bottom of the support plate (8). The metering tube (73) is located between the two limiting rails (72). Multiple blocking plates (74) corresponding to the metering tube (73) are slidably connected between the two limiting rails (72). The bottom of the metering tube (73) is in sliding contact with the blocking plate (74). Multiple sets of push plates (75) corresponding to the blocking plate (74) are provided at the bottom of the liquid storage box (71). Multiple reset structures corresponding to the blocking plate (74) are provided between the two limit rails (72).

2. The pretreatment system for removing interfering substances in chemical wastewater according to claim 1, characterized in that: The base (1) is in the shape of an inverted T. A first sliding groove (102) is provided on the vertical section of the base (1). A sliding block (11) is slidably connected in the first sliding groove (102). The outer frame (4) is fixedly connected to one side of the sliding block (11). A first electric telescopic rod (12) is also fixedly connected to the horizontal section of the base (1). The telescopic end of the first electric telescopic rod (12) is fixedly connected to the bottom of the sliding block (11). The top of the horizontal section of the base (1) is provided with a limiting slot (101), and a vacuum box (2) is movably connected in the limiting slot (101). The top of the vacuum box (2) is open. The inner wall of the vacuum box (2) is fixedly connected with a first inner edge (21). The bottom of the outer frame (4) is fixedly connected with a sealing strip (41). The bottom of the outer frame (4) is inserted into the top opening of the vacuum box (2), and the bottom of the sealing strip (41) abuts against the top of the first inner edge (21). The vacuum chamber (2) contains multiple sample receiving tubes (3) that correspond one-to-one with the filter tubes (5); An interface (201) is provided on one side of the vacuum chamber (2), and an external vacuum pump is connected to the vacuum chamber (2) through the interface (201).

3. The pretreatment system for removing interfering substances in chemical wastewater according to claim 2, characterized in that: Multiple filter tubes (5) are arranged in a line, and the top and bottom of the filter tubes (5) are open. The top of the filter tubes (5) is threaded to the bottom of the outer frame (4). Multiple liquid storage funnels (42) are fixedly connected to the bottom of the inner wall of the outer frame (4). The filter tube (5) is set one-to-one with the liquid storage funnel (42), and the filter tube (5) is connected to the corresponding liquid storage funnel (42). An air inlet is opened on the side wall of the outer frame (4), and a filter screen (43) is fixedly connected to the air inlet. The inner wall of the outer frame (4) is fixed with a second inner edge (44), and an inner frame (7) is detachably connected to the second inner edge (44). The top and bottom of the inner frame (7) are open and the inner cavity of the inner frame (7) is connected to the inner cavity of the outer frame (4). The support plate (8) is detachably connected to the inner frame (7). A slot (7103) is provided on the outer side wall of the liquid storage box (71). An alignment plate (791) is fixedly connected to the telescopic end of the second electric telescopic rod (79). One end of the alignment plate (791) is engaged with the slot (7103). The top of the liquid storage box (71) is open. Multiple partition plates (711) are fixedly connected at equal intervals on the inner wall of the liquid storage box (71). The partition plates (711) divide the interior of the liquid storage box (71) into multiple chambers. The drain ports (7101) are respectively located at the bottom of the chambers.

4. The pretreatment system for removing interfering substances in chemical wastewater according to claim 1, characterized in that: The support plate (8) located at the bottom of the liquid storage box (71) has a second sliding groove (801) symmetrically provided on its plate body. The bottom of the liquid storage box (71) is symmetrically fixed with a plurality of inverted T-shaped limiting sliders (76). The vertical section of the limiting slider (76) is slidably connected in the second sliding groove (801) on the same side, and the top of the horizontal section of the limiting slider (76) is slidably connected to the bottom of the support plate (8). The top and bottom of the metering tube (73) are open, the top of the metering tube (73) is flush with the top of the support plate (8), and the bottom extends to the bottom of the support plate (8); The reset structure includes a limiting strip (721) fixed between two limiting rails (72), a blocking plate (74) in the shape of L, the bottom of the metering tube (73) slidingly contacting the top of the horizontal section of the blocking plate (74), a limiting rod (741) fixedly connected to the side of the blocking plate (74) near the limiting strip (721), the limiting rod (741) slidingly inserted into the limiting strip (721), the free end of the limiting rod (741) passing through the limiting strip (721) and the end fixedly connected to a limiting ring (77), a first spring (78) sleeved on the limiting rod (741), the two ends of the first spring (78) abutting against the limiting strip (721) and the blocking plate (74) respectively.

5. The pretreatment system for removing interfering substances in chemical wastewater according to claim 4, characterized in that: The top opening diameter of the metering tube (73) is smaller than that of the drain port (7101). When the top opening of the metering tube (73) is connected to the corresponding drain port (7101), the horizontal section of the blocking plate (74) blocks the bottom opening of the corresponding metering tube (73); When the top opening of the metering tube (73) stops communicating with the corresponding drain port (7101), the push plate (75) contacts the corresponding plug plate (74); When the top opening of the metering tube (73) is fully connected to the cavity (7102), the horizontal section of the blocking plate (74) stops blocking the bottom opening of the corresponding metering tube (73); A first rubber ring (710) is fixedly attached to the inner wall of the drain port (7101). The bottom of the first rubber ring (710) slides in contact with the support plate (8). A second rubber ring (720) is fixedly attached to the inner wall of the bottom opening of the metering tube (73). The bottom of the second rubber ring (720) slides in contact with the top of the horizontal section of the block plate (74).

6. The pretreatment system for removing interfering substances in chemical wastewater according to claim 3, characterized in that: The multiple filter tubes (5) at the bottom of the outer frame (4) are arranged in two rows. A sample bottle bottom plate (91) is slidably connected in the vacuum box (2). The interface (201) is located above the sample bottle bottom plate (91). Multiple mounting grooves (9101) corresponding to the filter tubes (5) are opened on the top of the sample bottle bottom plate (91). A sample receiving tube (3) is placed in each mounting groove (9101). A metering liquid dispensing structure is symmetrically arranged on the support plate (8). The slot (7103) is opened on one side of the two liquid storage boxes (71) that are close to each other. The second electric telescopic rod (79) is located between the two liquid storage boxes (71), and the two ends of the alignment plate (791) are respectively engaged with the two slots (7103).

7. The pretreatment system for removing interfering substances in chemical wastewater according to claim 6, characterized in that: Multiple limiting guide posts (22) are fixed to the bottom of the inner wall of the vacuum chamber (2), and the same sample bottle bottom plate (91) is slidably arranged on the multiple limiting guide posts (22). A third electric telescopic rod (92) is fixedly connected to the bottom of the inner wall of the vacuum chamber (2). The third electric telescopic rod (92) is located below the bottom plate (91) of the sample bottle, and the telescopic end of the third electric telescopic rod (92) is fixedly connected to the bottom of the bottom plate (91) of the sample bottle.

8. The pretreatment system for removing interfering substances in chemical wastewater according to claim 7, characterized in that: The top of the outer frame (4) is rotatably connected to a cover plate (13) via a connecting shaft (131). Both the vacuum chamber (2) and the cover plate (13) are transparent.

9. The pretreatment system for removing interfering substances in chemical wastewater according to claim 7, characterized in that: Multiple mounting grooves (9101) are each fitted with a tension ring (93), and the center of the tension ring (93) is provided with an insertion interface (9301).

10. The pretreatment system for removing interfering substances in chemical wastewater according to claim 7, characterized in that: The power supply interfaces of the vacuum pump, the first electric telescopic rod (12), the second electric telescopic rod (79), and the third electric telescopic rod (92) are all electrically connected to the external power supply equipment; the vacuum pump, the first electric telescopic rod (12), the second electric telescopic rod (79), and the third electric telescopic rod (92) are all connected to the external control terminal via signal transmission.

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