Liquid sampling device for chemical engineering analysis, assay and detection

Abstract

The utility model discloses a liquid sampling device for chemical analysis, assay and detection, which relates to the technical field of chemistry and chemical engineering, and specifically comprises a box body, a sampling pipe and an outer pipeline structure, one side of the inner cavity of the box body is fixedly connected with a fixed pipe, and the inner cavity of the fixed pipe is connected with a piston through a lifting structure; the piston is matched with an inner cavity of the fixing pipe, and one side of the bottom end of the fixing pipe is fixedly connected with an exhaust pipe. The box body is detachably connected with the sampling tube. According to the liquid sampling device for chemical engineering analysis, assay and detection, the negative pressure principle is adopted, gas in the sampling pipe is pumped into the fixed pipe through the piston, under the negative pressure effect, a liquid sample enters the sampling pipe through the liquid suction channel, and automatic sampling is achieved; the depth of the second liquid suction pipe inserted into the liquid sample can be adjusted according to requirements, so that the liquid sampling device can be used for extracting and storing the liquid samples at different stages in a classified manner, and chemical and chemical engineering analysis of the liquid samples is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of chemical engineering technology, specifically a liquid sampling device for chemical analysis and testing. Background Technology

[0002] Chemical analysis refers to methods for determining the chemical composition or structure of substances. Based on the properties of the analyzed substance, it can be divided into inorganic analysis and organic analysis. According to the analytical requirements, it can be divided into qualitative analysis and quantitative analysis. Based on the quantity of the sample, it can be divided into macro analysis, semi-micro analysis, micro analysis, and ultra-micro analysis. In chemical production, it is often necessary to test the components of liquid products. To ensure the accuracy of the test results, it is usually necessary to test multiple components at different stages, which requires the use of liquid sampling devices.

[0003] In related technologies, when using liquid sampling devices for chemical analysis and testing, the pipette tip is inserted into the liquid sample. This results in liquid sample adhering to the pipette tip after it is removed, leading to waste of the liquid sample. Furthermore, liquid sample may drip during pipette tip transfer, easily causing contamination. Additionally, multiple samples are usually required for liquid analysis, but existing convenient sampling devices can only perform a limited number of samplings, reducing adaptability and hindering the classification, extraction, and storage of liquids at different stages. Therefore, this application proposes a liquid sampling device for chemical analysis and testing. Utility Model Content

[0004] This invention provides a liquid sampling device for chemical analysis and testing, which solves the problems mentioned in the background art, such as the liquid sample adhering to the surface of the pipette tip easily dripping and causing contamination when the sampling device is transferred; the sampling device can only perform a limited number of samplings, reducing its adaptability; and it is not conducive to the classification, extraction and storage of liquids at different stages.

[0005] This utility model provides the following technical solution: a liquid sampling device for chemical analysis and testing, including a box, a sampling tube and an external pipeline structure, a fixed tube is fixedly connected to one side of the inner cavity of the box, a piston is connected to the inner cavity of the fixed tube through a lifting structure, the piston is adapted to the inner cavity of the fixed tube, and an air extraction tube is fixedly connected to one side of the bottom end of the fixed tube.

[0006] The housing and the sampling tube are detachably connected. The sampling tube includes a tube body and a tube cap. The top of the tube cap is provided with an exhaust pipe and a liquid inlet pipe. The top of the inner cavity of both the exhaust pipe and the liquid inlet pipe is provided with a sealing structure. The sealing structure includes a positioning plate and a plug connected to the top center of the positioning plate by a spring. The inner cavity of both the exhaust pipe and the liquid inlet pipe is fixedly connected with the positioning plate. The top of the inner cavity of both the exhaust pipe and the liquid inlet pipe is provided with a locking hole that matches the plug.

[0007] The external pipe structure includes a movable block, which is compatible with both the exhaust pipe and the liquid inlet pipe. Connecting pipes are located in the middle of both sides of the movable block. The inner cavity of each connecting pipe has a second sealing structure, which includes a positioning plate fixedly connected to the top of the inner cavity of the connecting pipe and a plug connected to the bottom of the positioning plate via a spring. The plug engages with the middle of the bottom of the connecting pipe, and the plugs are magnetically repelled. A vent pipe is fixedly attached to the top of one connecting pipe, and the other end of the vent pipe is detachably connected to a suction pipe. A suction pipe is fixedly attached to the top of the other connecting pipe, and the other end of the suction pipe is connected to a second suction pipe. A wiping ring is movably connected to the outer ring of the second suction pipe, and a limit handle is fixedly attached to the top of the wiping ring. A cross groove is located in the middle of the movable block, and the two connecting pipes are connected through the horizontal part of the cross groove. A sealing rod is threadedly connected to the vertical part of the cross groove.

[0008] Preferably, the lifting structure includes a ball screw movably connected to the middle of the inner cavity of the fixed tube, a ball nut threadedly connected to the outer ring of the ball screw, the bottom of the ball nut being fixedly connected to the top of the piston, and the piston being movably connected to the ball screw.

[0009] Preferably, a telescopic tube is fixedly connected to the top of the piston, the ball nut is located in the inner cavity of the telescopic tube, and the other end of the telescopic tube is fixedly connected to the top of the inner cavity of the fixed tube.

[0010] Preferably, the housing is provided with a drive structure, which includes a servo motor connected to the housing, a drive gear connected to the end of the output shaft of the servo motor, and a driven gear fixedly connected to the top of the ball screw. The drive gear meshes with the driven gear. A protective cover is provided on the top of the housing, and the drive gear and the driven gear are both located in the inner cavity of the protective cover.

[0011] Preferably, the bottom of the inner cavity of the box is provided with a fixing groove adapted to the tube body, and the top of the inner cavity of the box is provided with an insertion hole for movably connecting to the sampling tube, the insertion hole being located directly above the fixing groove.

[0012] Preferably, the bottom of the inlet pipe is located below the bottom of the outlet pipe.

[0013] Preferably, a scale line is provided on one side of the second suction tube.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. This liquid sampling device for chemical analysis and testing adopts the principle of negative pressure. It uses a piston to draw the gas in the sampling tube into a fixed tube. Under the action of negative pressure, the liquid sample enters the sampling tube through the liquid suction channel, realizing automatic sampling. The depth of the liquid suction tube inserted into the liquid sample can be adjusted according to the needs, so that the liquid sampling device can classify, extract and store liquid samples at different stages, which is convenient for chemical analysis of liquid samples.

[0016] 2. This liquid sampling device for chemical analysis and testing can block the liquid aspiration channel by setting the second sealing structure, so as to prevent the liquid sample remaining in the liquid aspiration channel from dripping when the moving block is transferred. This facilitates the connection between the moving block and different sampling tubes, thereby realizing the rapid replacement of sampling tubes.

[0017] 3. In this liquid sampling device for chemical analysis and testing, the second suction tube does not need to be removed from the liquid sample during the sampling process, thus avoiding liquid sample dripping and contamination of the surrounding environment. Through the setting of the cross groove and sealing rod, the gas in the fixed tube can be squeezed into the suction channel, squeezing out the residual liquid in the suction channel, which is convenient for cleaning the suction channel. Through the setting of the limiting handle and wiping ring, the wiping ring can be moved by pushing the limiting handle, and the wiping ring can scrape off the liquid sample adhering to the second suction tube, which is convenient for transferring the second suction tube. Attached Figure Description

[0018] Figure 1 This is a front view of the structure of this utility model;

[0019] Figure 2 The structure of this utility model Figure 1 Rear view illustration;

[0020] Figure 3 This is a schematic diagram of the interior of the structural box of this utility model;

[0021] Figure 4 This is a schematic cross-sectional view of the structure of this utility model;

[0022] Figure 5 This is a schematic cross-sectional view of the sampling tube structure of this utility model;

[0023] Figure 6 The structure of this utility model Figure 5 Enlarged diagram of A in the middle;

[0024] Figure 7 This is a cross-sectional schematic diagram of the movable block of the present invention.

[0025] In the diagram: 1. Box body; 2. Opening door; 3. Insertion hole; 4. Pipe body; 5. Pipe cap; 6. Fixing pipe; 7. Suction pipe; 8. Vent pipe; 9. Protective cover; 10. Suction pipe one; 11. Suction pipe two; 12. Limiting handle; 13. Wiping ring; 14. Moving block; 15. Sealing rod; 16. Driven gear; 17. Driving gear; 18. Servo motor; 19. Ball screw; 20. Ball nut; 21. Piston; 22. Telescopic pipe; 23. Exhaust pipe; 24. Inlet pipe; 25. Plug one; 26. Spring one; 27. Positioning plate one; 28. Positioning plate two; 29. ​​Spring two; 30. Plug two; 31. Cross groove; 32. Fixing groove; 33. Connecting pipe; 34. Scale line; 35. Locking hole. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] This utility model provides a liquid sampling device for chemical analysis and testing, including a housing 1, a sampling tube and an external pipeline structure. A hinged door 2 is connected to one side of the housing 1, and a fixed tube 6 is fixedly connected to one side of the inner cavity of the housing 1. The inner cavity of the fixed tube 6 is provided with a lifting structure, which includes a ball screw 19 movably connected to the middle of the inner cavity of the fixed tube 6. A ball nut 20 is threadedly connected to the outer ring of the ball screw 19. When the ball screw 19 rotates, the ball nut 20 can move in the direction of the ball screw 19.

[0028] The housing 1 is equipped with a drive structure, which includes a servo motor 18 connected to the housing 1, a drive gear 17 connected to the end of the output shaft of the servo motor 18 through a reducer, and a driven gear 16 fixedly connected to the top of the ball screw 19. The drive gear 17 meshes with the driven gear 16. With the drive structure, when the servo motor 18 rotates, it can drive the drive gear 17 connected to it to rotate. The drive gear 17 can drive the ball screw 19 to rotate through the driven gear 16 meshing with it. The top of the housing 1 is equipped with a protective cover 9, and the drive gear 17 and the driven gear 16 are both located in the inner cavity of the protective cover 9.

[0029] A piston 21 is movably connected to the inner cavity of the fixed tube 6. The piston 21 is connected to the fixed tube 6 through a lifting structure, and the bottom of the ball nut 20 is fixedly connected to the top of the piston 21. The piston 21 is movably connected to the ball screw 19. When the ball nut 20 moves, it can drive the piston 21 to move.

[0030] In addition, a telescopic tube 22 is fixedly connected to the top of the piston 21, and a ball nut 20 is located in the inner cavity of the telescopic tube 22. The other end of the telescopic tube 22 is fixedly connected to the top of the inner cavity of the fixed tube 6. The telescopic tube 22 can be made of corrugated pipe. By setting the telescopic tube 22, the sealing between the piston 21 and the fixed tube 6 can be improved, and gas below the piston 21 can be prevented from entering above the piston 21. When the piston 21 contacts the bottom of the inner cavity of the fixed tube 6, the inner cavity of the fixed tube 6 is in a vacuum state.

[0031] The housing 1 is detachably connected to the sampling tube, which includes a tube body 4 and a cap 5. The top of the inner cavity of the housing 1 has an insertion hole 3 for movably connecting to the sampling tube, and the bottom of the inner cavity of the housing 1 has a fixing groove 32 adapted to the tube body 4. The insertion hole 3 is located directly above the fixing groove 32, guiding the sampling tube and facilitating its connection to the fixing groove 32. In some embodiments of this application, the inner wall of the fixing groove 32 has an internal thread, and the bottom end of the tube body 4 has an external thread adapted to the internal thread. The tube body 4 and the fixing groove 32 can be threadedly connected. In this case, the sampling tube and the housing 1 are fixed by a threaded connection. The cap 5 and the tube body 4 can also be fixed by a threaded connection.

[0032] The top of the cap 5 is provided with an exhaust pipe 23 and an inlet pipe 24. The bottom of the inlet pipe 24 is located below the bottom of the exhaust pipe 23. The top of the inner cavity of the exhaust pipe 23 and the inlet pipe 24 are provided with a sealing structure 1. The sealing structure 1 includes a positioning plate 27 and a plug 25 connected to the top center of the positioning plate 27 by a spring 26. The inner cavities of the exhaust pipe 23 and the inlet pipe 24 are fixedly connected with the positioning plate 27. The top of the inner cavity of the exhaust pipe 23 and the inlet pipe 24 are provided with a locking hole 35 that matches the plug 25. The plug 25 is movably connected to the inner cavity of the exhaust pipe 23 or the inner cavity of the inlet pipe 24. With the sealing structure 1 in place, under the action of external force, the plug 25 can move away from the locking hole 35. At this time, the inner cavity of the exhaust pipe 23 or the inner cavity of the liquid inlet pipe 24 is in an open state. The gas in the sampling tube can be discharged through the exhaust pipe 23, and the liquid sample can enter the sampling tube through the liquid inlet pipe 24. When the restriction on the plug 25 is released, the plug 25 can be reset under the action of the spring 26. The locking of the plug 25 with the locking hole 35 makes the exhaust pipe 23 or the liquid inlet pipe 24 in a blocked state.

[0033] A suction pipe 7 is fixedly connected to one side of the bottom end of the fixed pipe 6. The suction pipe 7 is connected to the sampling pipe through an external pipe structure. The external pipe structure includes a movable block 14. A connecting pipe 33 is provided in the middle of both sides of the movable block 14. A sealing structure 2 is provided in the inner cavity of the connecting pipe 33. The sealing structure 2 includes a positioning plate 28 fixedly connected to the top of the inner cavity of the connecting pipe 33 and a plug 30 connected to the bottom of the positioning plate 28 through a spring 29. A through hole is provided in the middle of the bottom of the inner cavity of the connecting pipe 33. 30 is engaged with the through hole, and plug 25 and plug 30 are in a state of magnetic repulsion. The moving block 14 is compatible with both the exhaust pipe 23 and the liquid inlet pipe 24. When the moving block 14 is engaged with both the exhaust pipe 23 and the liquid inlet pipe 24, under the action of the magnetic repulsion between plug 25 and plug 30, plug 25 can be separated from the locking hole 35, and plug 30 can be separated from the through hole. At this time, the inner cavity of the connecting pipe 33 is in a state of communication with the inner cavity of the exhaust pipe 23 or the liquid inlet pipe 24.

[0034] A vent pipe 8 is fixed to the top of a connecting pipe 33. The other end of the vent pipe 8 is detachably connected to the suction pipe 7. The vent pipe 8 and the suction pipe 7 can be connected by a threaded connection. One connecting pipe 33, the vent pipe 8 and the suction pipe 7 form a suction channel. The top of another connecting pipe 33 is fixedly connected to a first suction pipe 10. The other end of the first suction pipe 10 is connected to a second suction pipe 11. The other connecting pipe 33, the first suction pipe 10 and the second suction pipe 11 form a suction channel. When the device is in use, the second suction pipe 11 is inserted into the liquid sample storage bottle. When the piston 21 moves upward, the gas in the sampling tube can be drawn into the inner cavity of the fixed pipe 6. At this time, the sampling tube is under negative pressure. Under the action of negative pressure, the liquid sample can enter the sampling tube along the second suction pipe 11, the first suction pipe 10 and the inlet pipe 24 to achieve sampling.

[0035] The second suction tube 11 has a scale line 34 on one side, which the user can use to determine the depth to which the second suction tube 11 is inserted into the liquid sample. A wiping ring 13 is movably connected to the outer ring of the second suction tube 11, and a limiting handle 12 is fixedly connected to the top of the wiping ring 13. When using this device, the outer diameter of the limiting handle 12 is larger than the inner diameter of the mouth of the liquid sample storage bottle. The size of the limiting handle 12 can be set according to needs and is not limited here. With this setting, the limiting handle 12 can limit the second suction tube 11 and control the depth to which the second suction tube 11 is inserted into the liquid sample. The user can also move the wiping ring 13 by using the limiting handle 12. The wiping ring 13 can scrape off the liquid sample adhering to the outer surface of the second suction tube 11 to prevent the liquid sample from dripping everywhere.

[0036] The moving block 14 has a cross groove 31 in the middle. Two connecting pipes 33 are connected through the horizontal part of the cross groove 31. A sealing rod 15 is threadedly connected to the vertical part of the cross groove 31. When the sealing rod 15 is separated from the horizontal part of the cross groove 31, the inner cavities of the two connecting pipes 33 are in a connected state. When the piston 21 moves down, the gas in the fixed pipe 6 enters the liquid suction channel through the air extraction channel and the horizontal part of the cross groove 31, squeezing out the residual liquid in the liquid suction channel, which facilitates the cleaning of the liquid suction channel.

[0037] Both the vent tube 8 and the suction tube 10 can be made of corrugated tubing, the suction tube 21 can be made of quartz glass, and both the stopper 125 and the stopper 230 can be made of permanent magnets, with the top polarity of the stopper 125 and the bottom polarity of the stopper 230 being the same.

[0038] All electrical components involved in this application are prior art. Those skilled in the art understand their connection methods. With the help of those skilled in the art, all electrical components in this application and their compatible power supplies can be connected by wires. According to the actual situation, a suitable controller can be selected to meet the control requirements. For specific connections and control sequences, please refer to the description below. The electrical connection between each electrical component is completed in the order of operation. The detailed connection methods are well known in the art. The following mainly introduces the working principle and process, and will not describe the electrical control.

[0039] In summary: When using this liquid sampling device for chemical analysis and testing, the user engages the moving block 14 with both the inlet pipe 24 and the vent pipe 23 on the sampling tube. At this time, the inlet pipe 24 is located below the suction pipe 10, and the vent pipe 23 is located below the vent pipe 8. The tops of both the inlet pipe 24 and the vent pipe 23 are tightly fitted to the bottom of the connecting pipe 33. Under the action of the magnetic repulsion between the stopper 25 and the stopper 30, the stopper 25 and the locking hole 35 are engaged. Separate the plug 30 from the through hole. The inner cavity of the connecting tube 33 is in communication with the inner cavity of the inlet tube 24 or the inner cavity of the vent tube 23. The user can adjust the position of the limiting handle 12 on the suction tube 11 as needed and insert the suction tube 11 into the liquid sample storage bottle until the limiting handle 12 contacts the bottle opening. At this time, the limiting handle 12 can support and limit the suction tube 11, so that the depth of the suction tube 11 inserted into the liquid sample is controllable.

[0040] The servo motor 18 operates, driving the connected drive gear 17 to rotate. The drive gear 17, through its meshing driven gear 16, drives the ball screw 19 to rotate. The rotation of the ball screw 19 causes the threaded ball nut 20 to move in the direction of the ball screw 19. The movement of the ball nut 20 drives the connected piston 21 to move. Gas in the sampling tube is drawn into the inner cavity of the fixed tube 6 through the exhaust pipe 23 and the suction channel, creating a negative pressure in the sampling tube. Under this negative pressure, the liquid sample can enter the sampling tube along the suction tube 21, suction tube 10, and inlet pipe 24, achieving automatic sampling. Furthermore, during use, adjusting the depth of the bottom of the suction tube 21 within the liquid sample allows for the classification, extraction, and storage of liquids at different locations, improving ease of use.

[0041] If the piston 21 cannot move upwards further but sampling is still required, the user separates the vent pipe 8 from the suction pipe 7, the servo motor 18 rotates in the opposite direction, and the piston 21 can discharge the gas in the fixed pipe 6 through the suction pipe 7.

[0042] After sampling, the user separates the moving block 14 from the sampling tube and then screws the sealing rod 15 until the sealing rod 15 separates from the horizontal part of the cross groove 31. At this time, the inner cavities of the two connecting tubes 33 are in a connected state. The user lifts the second suction tube 11, so that the end of the second suction tube 11 separates from the liquid sample. The servo motor 18 rotates in the opposite direction, and the piston 21 squeezes the gas in the fixed tube 6 into the suction channel, squeezing out the liquid sample remaining in the suction channel, which facilitates the cleaning of the suction channel. The squeezed sample can be discharged back into the liquid sample storage bottle to avoid waste. When the servo motor 18 stops working, the liquid in the suction channel is completely squeezed out. The user drives the wiping ring 13 to move through the limit handle 12. The wiping ring 13 can scrape off the liquid sample adhering to the outer surface of the second suction tube 11, preventing the liquid sample on the surface of the second suction tube 11 from dripping everywhere during the transfer of the second suction tube 11.

[0043] All standard parts used in this utility model can be purchased from the market, and irregularly shaped parts can be customized according to the description and drawings. The specific connection methods of each part all adopt conventional means such as bolts that are mature in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art. Although the embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A liquid sampling device for chemical analysis and testing, comprising a housing (1), a sampling tube, and an external pipeline structure, characterized in that: A fixed tube (6) is fixedly connected to one side of the inner cavity of the box (1). A piston (21) is connected to the inner cavity of the fixed tube (6) through a lifting structure. The piston (21) is adapted to the inner cavity of the fixed tube (6). An air extraction tube (7) is fixedly connected to one side of the bottom end of the fixed tube (6). The housing (1) is detachably connected to the sampling tube. The sampling tube includes a tube body (4) and a tube cap (5). The top of the tube cap (5) is provided with an exhaust pipe (23) and an inlet pipe (24). The top of the inner cavity of both the exhaust pipe (23) and the inlet pipe (24) is provided with a sealing structure. The sealing structure includes a positioning plate (27) and a plug (25) connected to the top center of the positioning plate (27) by a spring (26). The inner cavity of both the exhaust pipe (23) and the inlet pipe (24) is fixedly connected with the positioning plate (27). The top of the inner cavity of both the exhaust pipe (23) and the inlet pipe (24) is provided with a locking hole (35) that matches the plug (25). The external pipe structure includes a movable block (14), which is compatible with both the exhaust pipe (23) and the inlet pipe (24). A connecting pipe (33) is provided in the middle of both sides of the movable block (14). The inner cavity of the connecting pipe (33) is provided with a second sealing structure. The second sealing structure includes a positioning plate (28) fixedly connected to the top of the inner cavity of the connecting pipe (33) and a plug (30) connected to the bottom of the positioning plate (28) via a spring (29). The plug (30) is engaged with the middle of the bottom of the connecting pipe (33). The plug (25) and the plug (30) are in a state of magnetic repulsion. One connecting pipe (3... 3) The top is fixed with a vent pipe (8), the other end of which is detachably connected to the suction pipe (7). The top of another connecting pipe (33) is fixedly connected with a first suction pipe (10), the other end of which is connected with a second suction pipe (11). The outer ring of the second suction pipe (11) is movably connected with a wiping ring (13), and the top of the wiping ring (13) is fixedly connected with a limit handle (12). The middle part of the moving block (14) is provided with a cross groove (31), and the two connecting pipes (33) are connected through the horizontal part of the cross groove (31). The vertical part of the cross groove (31) is threadedly connected with a sealing rod (15).

2. The liquid sampling device for chemical analysis and testing according to claim 1, characterized in that: The lifting structure includes a ball screw (19) movably connected to the middle of the inner cavity of the fixed tube (6). The outer ring of the ball screw (19) is threaded with a ball nut (20). The bottom of the ball nut (20) is fixedly connected to the top of the piston (21). The piston (21) is movably connected to the ball screw (19).

3. A liquid sampling device for chemical analysis and testing according to claim 2, characterized in that: The top of the piston (21) is fixedly connected to a telescopic tube (22), the ball nut (20) is located in the inner cavity of the telescopic tube (22), and the other end of the telescopic tube (22) is fixedly connected to the top of the inner cavity of the fixed tube (6).

4. A liquid sampling device for chemical analysis and testing according to claim 2, characterized in that: The housing (1) is provided with a drive structure, which includes a servo motor (18) connected to the housing (1), a drive gear (17) connected to the end of the output shaft of the servo motor (18), and a driven gear (16) fixedly connected to the top of the ball screw (19). The drive gear (17) meshes with the driven gear (16). The top of the housing (1) is provided with a protective cover (9), and the drive gear (17) and the driven gear (16) are both located in the inner cavity of the protective cover (9).

5. A liquid sampling device for chemical analysis and testing according to claim 1, characterized in that: The bottom of the inner cavity of the box (1) is provided with a fixing groove (32) that is adapted to the tube (4), and the top of the inner cavity of the box (1) is provided with an insertion hole (3) that is movably connected to the sampling tube. The insertion hole (3) is located directly above the fixing groove (32).

6. The liquid sampling device for chemical analysis and testing according to claim 1, characterized in that: The bottom of the inlet pipe (24) is located below the bottom of the outlet pipe (23).

7. A liquid sampling device for chemical analysis and testing according to claim 1, characterized in that: The second suction tube (11) has a scale line (34) on one side.

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