A sampling device for a liquid chemical analysis apparatus

Abstract

The application relates to the technical field of chemical analysis equipment, in particular to a sampling device for liquid chemical analysis equipment; the sampling device comprises a sampler body; a gas groove is formed in one side of the sampler body; a piston rod is slidably and sealingly connected in the gas groove; a plurality of liquid inlets are formed in the surface of the mounting column, and independent liquid suction hoses are matched, so that independent sampling of various liquid chemicals is realized, independent sampling devices for each chemical are not needed, the cost of equipment purchase, maintenance and storage is reduced, meanwhile, because each liquid chemical enters the corresponding sampling pipe through the independent liquid inlet and the liquid suction hose, the sampling channels do not interfere with each other, the pollution of residual liquid chemicals to the subsequent sampling samples is fundamentally eliminated, the accuracy of the analysis result is ensured, in addition, the sampling device does not need to be cleaned during the sampling process, the sampling period is greatly shortened, and the sampling and analysis efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of chemical analysis equipment technology, specifically a sampling device for liquid chemical analysis equipment. Background Technology

[0002] Since liquid chemicals are mostly colorless and transparent liquids, their composition, purity, or concentration cannot be distinguished by the naked eye. Therefore, qualitative and quantitative analysis must be performed using instruments. Before analysis, a suitable sample must be extracted from the storage tank using a specialized sampling device for use by the subsequent analytical equipment. However, in laboratories or production sites of industries such as chemical, pharmaceutical, food, and environmental protection, it is often necessary to sample and analyze a variety of different types of liquid chemicals. However, most commonly used sampling devices (such as glass sampling tubes, stainless steel samplers, closed sampling systems, etc.) are general-purpose. During the sampling process, when it is necessary to switch the sampling device from one liquid chemical to another, in order to avoid the residual liquid chemical in the sampling device from interfering with the analysis of the other liquid chemical, usually only two options are available: replacing the sampling device or cleaning the sampling device. Using a sampling device replacement method requires equipping each liquid chemical with a separate sampling device. When sampling different chemicals, the sampling device is directly replaced for sampling operations. Although this method does not require cleaning, has a fast switching speed, and does not pose a risk of cross-contamination, it increases sampling costs and also raises the maintenance and storage costs of the equipment. The method of using a cleaning sampling device involves cleaning the sampling device after sampling one chemical before using it for sampling the next chemical. Although this method only requires one set of equipment, the cleaning process extends the sampling time. In continuous testing or multi-batch production, the extended cleaning time directly lengthens the entire analysis cycle. In addition, cleaning generates waste liquid, increasing waste liquid treatment costs. If the cleaning is not thorough, trace residues of the previous batch of chemicals may mix into the next batch of samples, and even tiny residues may lead to distorted analytical results. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, this invention proposes a sampling device for liquid chemical analysis equipment. This invention achieves independent sampling of various liquid chemicals by providing multiple inlets on the surface of the mounting column and using independent suction hoses. This eliminates the need for separate sampling devices for each chemical, reducing the costs of equipment purchase, maintenance, and storage. Furthermore, because each liquid chemical enters its corresponding sampling tube through an independent inlet and suction hose, the sampling channels do not interfere with each other, fundamentally preventing contamination of subsequent samples by residual liquid chemicals and ensuring the accuracy of analytical results. In addition, there is no need to clean the sampling device during the sampling process, significantly shortening the sampling cycle and improving the efficiency of sampling and analysis.

[0004] The technical solution adopted by the present invention to solve its technical problem is as follows: A sampling device for liquid chemical analysis equipment according to the present invention includes a sampler body; an air groove is provided on one side of the sampler body; a piston rod is slidably and sealed in the air groove; a through groove is provided on the surface of the piston rod; and a one-way valve is installed in the through groove. The sampler body is internally threaded with a mounting post; a connecting post is fixedly connected to the lower end of the mounting post; a liquid inlet is provided on the upper end face of the mounting post; the liquid inlet extends to the lower end face of the connecting post; an annular groove is provided on the cylindrical surface of the mounting post; the annular groove communicates with an air groove; an air extraction hole is provided at the lower end of the connecting post; the air extraction hole communicates with the annular groove; a sampling tube is provided below the mounting post; the sampling tube is connected to the connecting post; and a liquid extraction hose is installed at the upper end of the liquid inlet. The cylindrical surface of the connecting column has an installation groove; an annular airbag is installed in the installation groove; an air passage communicating with the airbag is opened inside the connecting column; the end of the air passage away from the airbag is connected to the air groove; a pressure stabilizing groove is opened on the inner wall of the air groove; a safety valve is installed in the pressure stabilizing groove. A shielding unit is installed on the upper end of the sampler body; the shielding unit is used to shield the liquid inlet.

[0005] Preferably, the inner wall of the gas groove is provided with an exhaust groove; the suction hole extends to the upper end of the mounting column; the inner wall of the sampler body is provided with a connecting groove communicating with the gas passage; the exhaust groove is connected to the connecting groove; an exhaust rod is slidably and sealed inside the exhaust groove; the exhaust rod is connected to the inner wall of the exhaust groove by a connecting spring; the inner wall of the gas passage is provided with an exhaust hole communicating with the exhaust groove; the inner wall of the gas groove is provided with an air inlet hole communicating with the connecting groove; a one-way valve is installed inside the air inlet hole.

[0006] Preferably, the shielding unit includes a shielding plate; the shielding plate is rotatably and sealingly connected to the sampler body; a through hole is provided at the upper end of the shielding plate; the through hole communicates with the liquid inlet; a plug is fixedly connected to one end of the liquid extraction hose; the plug is threaded into the liquid inlet.

[0007] Preferably, the shielding unit includes a connecting nozzle; the connecting nozzle is slidably and sealingly connected to the liquid inlet; the mounting column has a chamber communicating with the liquid inlet; the connecting nozzle is connected to the inner wall of the chamber by a support spring; and the side wall of the connecting nozzle has a T-shaped hole.

[0008] Preferably, one end of the liquid extraction hose is fixedly connected to a connector; the connector is threadedly connected to the connecting nozzle.

[0009] Preferably, the sampling tube has a flange at its upper end; a support plate is slidably connected inside the sampler body; a loading port is opened on the surface of the support plate; the loading port is used to load the sampling tube; a steel wire rope is fixedly connected to the upper end of the support plate; a sliding groove is opened on the surface of the sampler body; a slider is slidably connected in the sliding groove; the end of the steel wire rope away from the support plate is fixedly connected to the slider; and a magnet is embedded in the lower end of the sliding groove.

[0010] Preferably, the inner wall of the loading port is provided with a groove; a damping block is slidably connected in the groove; the damping block is connected to the bottom of the groove by a limiting spring.

[0011] Preferably, a support cylinder is rotatably connected to the lower end of the sampler body; the sampling tube is located inside the support cylinder.

[0012] Preferably, the upper end of the mounting column is provided with an air chamber communicating with the annular groove, and the air chamber is connected to the air extraction hole; a sealing cap is threaded to the upper port of the air chamber; and a partition plate is slidably sealed to the inner wall of the air chamber.

[0013] Preferably, a float plate is installed at the lower end of the air chamber, and the float plate is slidably connected in the air extraction hole.

[0014] The beneficial effects of this invention are as follows: 1. This invention enables independent sampling of various liquid chemicals by providing multiple liquid inlets on the surface of the mounting column and using independent suction hoses. This eliminates the need for separate sampling devices for each chemical, reducing the costs of equipment purchase, maintenance, and storage. Furthermore, because each liquid chemical enters its corresponding sampling tube through an independent inlet and suction hose, the sampling channels do not interfere with each other, fundamentally preventing contamination of subsequent samples by residual liquid chemicals and ensuring the accuracy of analytical results. In addition, there is no need to clean the sampling device during the sampling process, significantly shortening the sampling cycle and improving the efficiency of sampling and analysis.

[0015] 2. This invention, by setting a connecting nozzle, ensures that the inlet is in a connected state when connected to the liquid extraction hose, and that the T-shaped hole is blocked by the inner wall of the inlet when not connected to the liquid extraction hose, thus sealing the inlet. This allows each inlet to work independently, ensuring that the channels do not interfere with each other during sampling and effectively avoiding cross-contamination. At the same time, users can flexibly adapt to single-layer or multi-layer sampling scenarios by selecting different numbers and lengths of liquid extraction hoses, making operation simple and meeting the sampling needs of various liquid chemicals, thus effectively improving the applicability of this invention.

[0016] 3. This invention, by setting up a float plate, allows gas from the sampling tube connected to the liquid extraction hose to enter the extraction port during the process of the piston rod withdrawing from the gas groove. The gas entering the extraction port carries vapor, pushing the float plate upward against gravity. At this time, the float plate no longer obstructs the extraction port, allowing it to open and communicate with its gas chamber. Since the gas chamber is connected to the annular groove, the gas drawn into the gas chamber can flow into the gas groove through the annular groove. In a static state, the float plate falls to the bottom of the gas chamber under gravity, at which point it blocks the extraction port. Thus, in a static state, the vapor of volatile liquids in the annular groove or gas groove is blocked by the float plate, preventing the vapors of volatile liquids from diffusing to other extraction ports and entering other sampling tubes, avoiding cross-contamination, and ensuring the accuracy of the analysis results.

[0017] 4. This invention features a sealing cap that is threaded onto the opening of the gas chamber, effectively sealing it. After sampling the liquid chemicals, the user unscrews the cap along the thread direction to remove it from the gas chamber. This exposes the opening of the gas chamber, facilitating cleaning of the interior and extraction port, significantly reducing the difficulty of cleaning the installation column. After cleaning, the sealing cap can be reinstalled for reuse, allowing the installation column to be used repeatedly and effectively, extending its service life and reducing operating costs. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention; Figure 3 yes Figure 2 Enlarged view of point A in the middle; Figure 4 yes Figure 2 Enlarged view of point B in the middle; Figure 5 yes Figure 2 Enlarged view of point C in the middle; Figure 6This is a partial cross-sectional view of the sampler body in this invention; Figure 7 yes Figure 6 Enlarged view of point D in the middle; Figure 8 yes Figure 6 Enlarged view at point E in the middle; Figure 9 This is a partial cross-sectional view of the shielding plate in this invention.

[0020] In the diagram: 1. Sampler body; 11. Gas groove; 111. Exhaust groove; 112. Connecting groove; 113. Exhaust rod; 114. Connecting spring; 115. Exhaust port; 116. Inlet port; 12. Piston rod; 13. Through groove; 14. Sampling tube; 141. Flange; 15. Liquid extraction hose; 16. Slide groove; 161. Slider; 162. Magnet; 17. Support cylinder; 2. Mounting column; 21. Connecting column; 211. Liquid inlet; 212. Air extraction. 21. Hole; 22. Annular groove; 23. Mounting groove; 231. Airbag; 232. Air passage; 24. Pressure stabilizing groove; 25. Air chamber; 26. Sealing cover; 27. Divider plate; 28. Float plate; 3. Baffle plate; 31. Through hole; 32. Plug; 4. Connecting nozzle; 41. Chamber; 42. Support spring; 43. T-hole; 44. Connector; 5. Support plate; 51. Loading port; 511. Wire rope; 52. Groove; 53. Damping block; 54. Limiting spring. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] like Figures 1 to 9 As shown, the present invention includes the following embodiments: Example 1: A sampling device for liquid chemical analysis equipment, comprising a sampler body 1; an air groove 11 is provided on one side of the sampler body 1; a piston rod 12 is slidably and sealed within the air groove 11; a through groove 13 is provided on the surface of the piston rod 12; a one-way valve is installed within the through groove 13; The sampler body 1 is internally threaded with a mounting post 2; a connecting post 21 is fixedly connected to the lower end of the mounting post 2; a liquid inlet 211 is provided on the upper end face of the mounting post 2; the liquid inlet 211 extends to the lower end face of the connecting post 21; an annular groove 22 is provided on the cylindrical surface of the mounting post 2; the annular groove 22 communicates with the air groove 11; an air extraction hole 212 is provided at the lower end of the connecting post 21; the air extraction hole 212 communicates with the annular groove 22; a sampling tube 14 is provided below the mounting post 2; the sampling tube 14 is connected to the connecting post 21; a liquid extraction hose 15 is installed at the upper end of the liquid inlet 211. The cylindrical surface of the connecting column 21 is provided with an installation groove 23; an annular airbag 231 is installed in the installation groove 23; an air passage 232 communicating with the airbag 231 is provided inside the connecting column 21; one end of the air passage 232 away from the airbag 231 is connected to the air groove 11; a pressure stabilizing groove 24 is provided on the inner wall of the air groove 11; a safety valve is installed in the pressure stabilizing groove 24. A shielding unit is installed on the upper end of the sampler body 1; the shielding unit is used to shield the liquid inlet 211.

[0023] In this embodiment, the inner wall of the air groove 11 is provided with an exhaust groove 111; the suction hole 212 extends to the upper end of the mounting column 2; the inner wall of the sampler body 1 is provided with a connecting groove 112 that communicates with the air passage 232; the exhaust groove 111 communicates with the connecting groove 112; an exhaust rod 113 is slidably and sealedly connected inside the exhaust groove 111; the exhaust rod 113 is connected to the inner wall of the exhaust groove 111 by a connecting spring 114; the inner wall of the air passage 232 is provided with an air outlet 115 that communicates with the exhaust groove 111; the inner wall of the air groove 11 is provided with an air inlet 116 that communicates with the connecting groove 112; a one-way valve is installed inside the air inlet 116.

[0024] In this embodiment, the shielding unit includes a shielding plate 3; the shielding plate 3 is rotatably and sealingly connected to the sampler body 1; a through hole 31 is provided at the upper end of the shielding plate 3; the through hole 31 is connected to the liquid inlet 211; a plug 32 is fixedly connected to one end of the liquid extraction hose 15; the plug 32 is threadedly connected to the liquid inlet 211.

[0025] The larger end of the sampler body 1 is a hollow cylindrical structure, and the air groove 11 is opened at the other end of the sampler body 1 and extends through the larger end of the sampler body 1. In use, the user selects the mounting column 2 with the required number of liquid inlets 211 according to their needs, thus flexibly adapting to the sampling requirements of various liquid chemicals. For example, when sampling and analyzing four liquid chemicals, the user selects the mounting column 2 with four liquid inlets 211. Then, the selected mounting column 2 is installed on the sampler body. Inside the hollow cylindrical structure of the sampler body 1, the mounting column 2 is inserted into the sampler body 1 from below the larger end. By rotating the mounting column 2, the threaded connection between the mounting column 2 and the sampler body 1 forms a seal to block the air groove 11 of the sampler body 1. At this time, the annular groove 22 on the surface of the mounting column 2 is directly opposite the air groove 11. Since the annular groove 22 is connected to the air extraction hole 212, the air groove 11 is connected to the air extraction hole 212 through the annular groove 22 on the surface of the mounting column 2.

[0026] In the initial state, the connecting groove 112 is set as an annular shape. After the mounting post 2 is threadedly connected to the sampler body 1, the connecting groove 112 is connected to the air passage 232. Since the end of the connecting groove 112 connected to the exhaust groove 111 is close to the bottom of the exhaust groove 111, when the piston rod 12 is completely located in the air groove 11, the exhaust rod 113 in the air groove 11 is squeezed by the piston rod 12 and completely penetrates into the connecting groove 112. At this time, the connecting spring 114 in the connecting groove 112 is compressed by the exhaust rod 113, so that the larger end of the exhaust rod 113 passes through the connecting end of the connecting groove 112 and the exhaust groove 111. Therefore, the connecting groove 112 is connected to the air outlet 115 through the exhaust groove 111.

[0027] Before sampling liquid chemicals, the sampling tube 14 needs to be installed. The specific steps are as follows: flip the sampler body 1 so that the mounting column 2 installed inside the sampler body 1 faces upward. The mounting column 2 will drive the connecting column 21 at the lower end to flip upward at the same time. Then, align the sampling tube 14 with the tube opening facing downward with the connecting column 21, and push the sampling tube 14 close to the connecting column 21 so that the connecting column 21 is inserted into the tube opening of the sampling tube 14. At this time, the connecting column 21 drives the air bladder 231 in the lower mounting groove 23 to be located in the sampling tube 14, thereby completing the connection between the connecting column 21 and the sampling tube 14. Similarly, after completing the connection of the remaining three sampling tubes 14 and the connecting column 21, pull the piston rod 12 in the air groove 11 to move away from the mounting column 2 along the air groove 11 so that the piston rod 12 extends out of the air groove 11.

[0028] Because the piston rod 12 includes a piston head and a rod body, the diameter of the piston head is larger than the diameter of the rod body. The rod body is in sealed contact with the end of the air groove 11 away from the mounting post 2, and the piston head is slidably sealed within the air groove 11. Therefore, the piston rod 12 divides the air groove 11 into two air chambers 25 through the piston head. One air chamber 25 is connected to the air outlet 115, and the other air chamber 25 is connected to the air inlet 116. Since the air chambers 25 on both sides of the piston rod 12 are connected through the air inlet 116, the connecting groove 112, the exhaust groove 111, and the suction hole 212, when the piston rod 12 extends out of the air groove 11, the gas in the air chamber 25 in the direction of travel is pushed into the rear air chamber 25 by the piston rod 12 until the exhaust rod 113 passes the connecting end of the connecting groove 112 and the exhaust groove 111. The exhaust rod 113 then connects the air outlet 115 with the connecting groove 116. 2. Blocking: As the piston rod 12 continues to extend out of the air groove 11, the gas in the direction of travel is pushed into the connecting groove 112 by the piston rod 12 through the air inlet 116. The gas entering the connecting groove 112 pushes the exhaust rod 113 to fully extend out of the exhaust groove 111, causing the exhaust rod 113 extending out of the exhaust groove 111 to block the air outlet 115. Subsequently, the gas entering the connecting groove 112 will flow directly into the annular airbag 231 through the air passage 232. At this time, the annular airbag 231 is inflated and extends radially until the radially extended airbag 231 extends out of the mounting groove 23 and contacts the inner wall of the sampling tube 14. The radially extended airbag 231 abuts against the inner wall of the sampling tube 14. At this time, the connecting column 21 seals the opening of the sampling tube 14 through the airbag 231, so that the connecting column 21 and the sampling tube 14 are sealed together through the airbag 231.

[0029] As gas is continuously injected into the airbag 231 from the air tank 11, the air pressure inside the airbag 231 increases, and the air pressure inside the air tank 11 also increases accordingly. When the air pressure inside the air tank 11 reaches the preset pressure of the safety valve, the safety valve opens. At this time, the gas inside the air tank 11 will be discharged through the safety valve of the pressure stabilizing tank 24. The purpose of the safety valve is to automatically release the air pressure inside the air tank 11 when the inflation pressure of the airbag 231 reaches the preset value, to prevent overpressure damage to the airbag 231, and to improve the service life of the airbag 231.

[0030] After the airbag 231 is inflated, the piston rod 12 is pushed back to its original position, and then the sampler body 1 is flipped so that the mounting column 2 drives the liquid inlet 211 to face upward. Then the baffle plate 3 is rotated, and the through hole 31 on the surface of the baffle plate 3 will rotate synchronously. Since there is a through hole 31 on the surface of the baffle plate 3, when the through hole 31 is aligned with one of the liquid inlets 211, the plug 32 of the suction hose 15 is inserted into the through hole 31 of the baffle plate 3. The plug 32 will pass through the through hole 31 and be inserted into the liquid inlet 211, so that the suction hose 15 is threadedly connected to the liquid inlet 211 through the plug 32. At this time, the other three liquid inlets 211 are blocked and sealed by the baffle plate 3.

[0031] When extracting liquid chemicals, simply insert the end of the extraction hose 15 away from the plug 32 into the container containing the liquid chemicals, and then pull the piston rod 12 to slide within the gas groove 11. As the piston rod 12 extends out of the gas groove 11, it compresses the gas near the pressure stabilizing tank 24 and ejects it from the pressure stabilizing tank 24. This increases the space near the mounting column 2 in the gas groove 11 and creates a negative pressure. Therefore, the gas in the sampling tube 14 enters the annular groove 22 through the extraction hole 212 and flows into the gas groove 11 from the annular groove 22. Because the through hole 31 of the baffle plate 3 is connected to one of the sampling tubes 14, while the other three sampling tubes 14... The inlet 211 is sealed by the baffle plate 3, so the air in the sampling tube 14 connected to the liquid extraction hose 15 is extracted, making the air pressure in the sampling tube 14 negative. The liquid chemicals are drawn into the sampling tube 14 through the liquid extraction hose 15. It should be noted that when the piston rod 12 is pushed into the gas tank 11, the gas in the gas tank 11 is pushed by the piston rod 12 and flows into the other side of the piston rod 12 through the one-way valve of the through groove 13. When the piston rod 12 collides with the exhaust rod 113, the user needs to immediately stop pushing the piston rod 12 and start pulling the piston rod 12 in the direction of extending out of the gas tank 11.

[0032] After sampling is completed, remove the used suction tubing 15, then rotate the baffle 3 so that the through hole 31 of the baffle 3 is aligned with the inlet 211 of the next sampling tube 14. Then, insert the new suction tubing 15 into the inlet 211 through the through hole 31, and insert the other end of the new suction tubing 15 into a container containing another liquid chemical to extract the other liquid chemical. Repeat this process until the four liquid chemicals are extracted into the four sampling tubes 14 respectively. At this point, the user holds the four test tubes with one hand and pushes the piston rod 1 with the other hand. 2. The piston rod 12 fully enters the gas groove 11, causing the exhaust rod 113 to fully enter the exhaust groove 111, thereby connecting the connecting groove 112, the exhaust groove 111, and the air outlet 115. At this time, the gas in the air bag 231 can flow through the air passage 232, the connecting groove 112, the exhaust groove 111, and the air outlet 115 in sequence, causing the air bag 231 to contract. At this time, the sampling tube 14 is no longer sealed to the connecting column 21 through the air bag 231, which makes it easy for the user to remove the sampling tube 14 and conduct analysis experiments on the four liquid chemicals in the four sampling tubes 14.

[0033] This invention enables independent sampling of various liquid chemicals by providing multiple liquid inlets 211 on the surface of the mounting column 2 and using independent suction hoses 15. This eliminates the need for separate sampling devices for each chemical, reducing the costs of equipment purchase, maintenance, and storage. Furthermore, because each liquid chemical enters its corresponding sampling tube 14 through an independent liquid inlet 211 and suction hose 15, the sampling channels do not interfere with each other, fundamentally preventing contamination of subsequent samples by residual liquid chemicals and ensuring the accuracy of analytical results. In addition, there is no need to clean the sampling device during the sampling process, significantly shortening the sampling cycle and improving the efficiency of sampling and analysis.

[0034] Example 2: The shielding unit includes a connecting nozzle 4; the connecting nozzle 4 is slidably and sealingly connected to the liquid inlet 211; the mounting column 2 has a chamber 41 communicating with the liquid inlet 211; the connecting nozzle 4 is connected to the inner wall of the chamber 41 by a support spring 42; the side wall of the connecting nozzle 4 has a T-shaped hole 43.

[0035] In this embodiment, one end of the liquid extraction hose 15 is fixedly connected to a connector 44; the connector 44 is threadedly connected to the connector 4.

[0036] In the initial state, the connecting nozzle 4 is set in a cross shape. The connecting nozzle 4 is slidably sealed in the chamber 41, and the lower end of the connecting nozzle 4 passes through the chamber 41 and is located in the liquid inlet 211. This causes the connecting nozzle 4 to drive the lower two ends of the T-shaped hole 43 to be located in the liquid inlet 211. The connecting nozzle 4 slides and seals against the inner wall of the liquid inlet 211, so that the T-shaped hole 43 is blocked by the inner wall of the liquid inlet 211.

[0037] Some liquid chemicals can separate into two phases (e.g., aqueous and organic phases). Therefore, it is necessary to sample the upper and lower liquid layers. Before sampling, the user should thread the connector 44 of the suction hose 15 to the two connecting nozzles 4, causing the threaded connecting nozzles 4 to spirally advance into the connector 44. At this time, the connecting nozzles 4 compress the support spring 42 within the chamber 41, continuously extending it out of the inlet 211. Once the connecting nozzles 4 and connector 44 are tightened, the connecting nozzles 4 drive both ends of the T-hole 43 into the chamber 41. At this point, the inlet 211 connects to the T-hole 43 through the chamber 41. This process is achieved by setting the two suction hoses 15 to have different lengths. When two suction hoses 15 are inserted into the same tank containing liquid chemicals, the two suction hoses 15 are located at different liquid levels in the tank, allowing the two suction hoses 15 to simultaneously sample the upper and lower liquid layers in the same tank. When the user pulls the piston rod 12 and slides it in the air tank 11, the air in the two sampling tubes 14 connected to the suction hoses 15 is drawn into the air tank 11. At this time, the liquid chemicals are drawn into the two sampling tubes 14 through the suction hoses 15, while the other two connecting nozzles 4 not connected to the suction hoses 15 are still located in the liquid inlet 211. At this time, the T-shaped holes 43 of the two connecting nozzles 4 are blocked, causing the liquid inlet 211 where the connecting nozzles 4 are located to remain sealed.

[0038] If it is necessary to sample the upper and lower liquid layers of two liquid chemicals, the user connects two sets of suction hoses 15 of different lengths to the connectors 4 in the four inlets 211, inserts two suction hoses 15 of different lengths into the same tank containing liquid chemicals, thereby enabling simultaneous sampling of the upper and lower liquid layers of two liquid chemicals, thus improving sampling efficiency.

[0039] This invention, by setting a connecting nozzle 4, ensures that when the connecting nozzle 4 is connected to the liquid extraction hose 15, the liquid inlet 211 is in a connected state. When the connecting nozzle 4 is not connected to the liquid extraction hose 15, the T-shaped hole 43 is blocked by the inner wall of the liquid inlet 211, and the liquid inlet 211 is in a sealed state. This allows each liquid inlet 211 to work independently, ensuring that the channels do not interfere with each other during the sampling process and effectively avoiding cross-contamination. At the same time, users can flexibly adapt to single-layer or multi-layer sampling scenarios by selecting to connect different numbers and lengths of liquid extraction hoses 15. The operation is simple and can meet the sampling needs of various liquid chemicals, thus effectively improving the applicability of this invention.

[0040] Example 3: The sampling tube 14 has a flange 141 at its upper end; a support plate 5 is slidably connected inside the sampler body 1; a loading port 51 is opened on the surface of the support plate 5; the loading port 51 is used to load the sampling tube 14; a steel wire rope 511 is fixedly connected to the upper end of the support plate 5; a sliding groove 16 is opened on the surface of the sampler body 1; a slider 161 is slidably connected in the sliding groove 16; the end of the steel wire rope 511 away from the support plate 5 is fixedly connected to the slider 161; and a magnet 162 is embedded in the lower end of the sliding groove 16.

[0041] In this embodiment, a groove 52 is provided on the inner wall of the loading port 51; a damping block 53 is slidably connected in the groove 52; the damping block 53 is connected to the bottom of the groove 52 by a limiting spring 54.

[0042] In this embodiment, the lower end of the sampler body 1 is rotatably connected to a support cylinder 17; the sampling tube 14 is located inside the support cylinder 17.

[0043] Most liquid chemicals are sampled using glass sampling tubes 14. However, the surface of glass sampling tubes 14 is smooth and fragile, resulting in low friction between the glass sampling tube 14 and the air bladder 231. Therefore, by setting a support cylinder 17, the support cylinder 17 can be threaded to the lower end of the sampler body 1, allowing the support cylinder 17 to load the sampling tube 14 and support the lower end of the sampling tube 14, preventing the sampling tube 14 from falling. At the same time, the support cylinder 17 can also protect the sampling tube 14, preventing damage to the glass sampling tube 14 due to collision during the sampling process, thus improving the safety of sampling.

[0044] In use, the lower end of the mounting column 2 has a protruding rod, and the support plate 5 is slidably connected to the mounting column 2 via the protruding rod. In the initial state, the support plate 5 slides downward under the action of gravity and extends out of the sampler body 1. At this time, the user inserts the sampling tube 14 into the loading port 51 of the support plate 5, causing the sampling tube 14 to squeeze the damping block 53 into the groove 52, and causing the damping block 53 to squeeze the limiting spring 54 into the groove 52. The damping block 53 is made of silicone rubber, giving it good elasticity and flexibility. The end of the damping block 53 away from the groove 52 has an arc-shaped surface to reduce the impact of the damping block 53 on the glass material. When the sampling tube 14 is crushed, and the sampling tube 14 is fully inserted into the loading port 51, the damping block 53 is pushed by the limiting spring 54 and pressed against the sampling tube 14, so that the sampling tube 14 is pushed by the damping block 53 and locked into the loading port 51. Since the sampling tube 14 is provided with a flange 141 at the upper end, and the diameter of the loading port 51 is smaller than the diameter of the flange 141 of the sampling tube 14, the upper end of the loading port 51 will support the flange 141 of the sampling tube 14, so that the sampling tube 14 can be stably connected to the loading port 51, and the upper end of the sampling tube 14 can be precisely aligned with the connecting post 21 above.

[0045] After the sampling tube 14 is installed, the user pulls the slider 161 down along the slide 16, so that the slider 161 can pull the support plate 5 up through the steel wire rope 511. The support plate 5 then drives the sampling tube 14 up until the connecting post 21 is inserted into the upper end of the sampling tube 14, achieving a stable connection between the sampling tube 14 and the connecting post 21. At this time, the slider 161 slides to the lower end of the slide 16, so that the slider 161 is tightly attracted by the magnet 162. After sampling is completed, the user pushes the slider 161 to overcome the attraction force of the magnet 162 and rises along the slide 16, so that the steel wire rope 511 is released. At this time, the support plate 5 drives the sampling tube 14 down under the action of gravity, so that the user can easily remove the sampling tube 14 from the loading port 51 for subsequent analysis and testing.

[0046] Example 4: The upper end of the mounting column 2 is provided with an air chamber 25 that communicates with the annular groove 22. The air chamber 25 is connected to the air extraction hole 212. The upper port of the air chamber 25 is threaded with a sealing cap 26. The inner wall of the air chamber 25 is slidably sealed with a partition plate 27.

[0047] In this embodiment, a float plate 28 is installed at the lower end of the air chamber 25, and the float plate 28 is slidably connected in the air extraction hole 212.

[0048] If multiple volatile liquid chemicals are sampled simultaneously, the volatile vapors will enter the annular trough 22 and the gas trough 11 with the air. After sampling, when the sample is left to stand, the vapors of the volatile liquids in the annular trough 22 or the gas trough 11 may diffuse to other air extraction ports 212 or even enter other sampling tubes 14, causing cross-contamination.

[0049] To address this, a float plate 28 is installed. During the process of the piston rod 12 drawing out the gas groove 11, the gas in the sampling tube 14 connected to the liquid extraction hose 15 can enter the gas extraction port 212. The gas entering the gas extraction port 212 will push the float plate 28 to rise against the force of gravity. At this time, the float plate 28 no longer obstructs the gas extraction port 212, allowing the gas extraction port 212 to open and communicate with the gas chamber 25. Since the gas chamber 25 is connected to the annular groove 22, the gas drawn into the gas chamber 25 can flow into the gas groove 11 through the annular groove 22. In the static state, the float plate 28 falls to the bottom of the gas chamber 25 under the action of gravity. At this time, the float plate 28 blocks the gas extraction port 212. Thus, in the static state, the vapor of the volatile liquid in the annular groove 22 or the gas groove 11 is blocked by the float plate 28, preventing the vapor of the volatile liquid from diffusing to other gas extraction ports 212 and entering other sampling tubes 14, avoiding cross-contamination and ensuring the accuracy of the analysis results. By setting the partition plate 27, the interior of the air chamber 25 can be separated to ensure that multiple air extraction holes 212 are in independent spaces. This avoids cross-contamination of volatile liquid vapors in the air chamber 25, preventing the vapors of various volatile liquids from reacting to form liquids. It also prevents the liquid reactants generated when the float plate 28 is opened next time from flowing back to the sampling tube 14 through the air extraction hole 212, thus avoiding cross-contamination and further improving the reliability of sampling.

[0050] By setting a sealing cap 26, which is installed at the opening of the gas chamber 25 via a threaded connection, the sealing cap 26 can seal the gas chamber 25. After sampling of the liquid chemicals is completed, the user can unscrew the sealing cap 26 along the thread direction to remove it from the gas chamber 25. After the sealing cap 26 is removed, the opening of the gas chamber 25 is exposed, which makes it convenient for the user to clean the inside of the gas chamber 25 and the air extraction hole 212. This greatly reduces the cleaning difficulty of the mounting column 2. After cleaning, the sealing cap 26 can be reinstalled for reuse, allowing the mounting column 2 to be used repeatedly and effectively, extending its service life and reducing the cost of use.

[0051] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be construed as indicating or implying relative importance. In the description of the present invention, fixed connection refers to fixed connection.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A sampling device for liquid chemical analysis equipment, comprising a sampler body; an air groove is provided on one side of the sampler body; a piston rod is slidably and sealingly connected within the air groove; a through groove is provided on the surface of the piston rod; a one-way valve is installed within the through groove, characterized in that: The sampler body is internally threaded with a mounting post; a connecting post is fixedly connected to the lower end of the mounting post; a liquid inlet is provided on the upper end face of the mounting post; the liquid inlet extends to the lower end face of the connecting post; an annular groove is provided on the cylindrical surface of the mounting post; the annular groove communicates with an air groove; an air extraction hole is provided at the lower end of the connecting post; the air extraction hole communicates with the annular groove; a sampling tube is provided below the mounting post; the sampling tube is connected to the connecting post; and a liquid extraction hose is installed at the upper end of the liquid inlet. The cylindrical surface of the connecting column has an installation groove; an annular airbag is installed in the installation groove; an air passage communicating with the airbag is opened inside the connecting column; the end of the air passage away from the airbag is connected to the air groove; a pressure stabilizing groove is opened on the inner wall of the air groove; a safety valve is installed in the pressure stabilizing groove. A shielding unit is installed on the upper end of the sampler body; the shielding unit is used to shield the liquid inlet.

2. The sampling device for liquid chemical analysis equipment according to claim 1, characterized in that: The inner wall of the gas groove is provided with an exhaust groove; the suction hole extends to the upper end of the mounting column; the inner wall of the sampler body is provided with a connecting groove that communicates with the gas passage; the exhaust groove is connected to the connecting groove; an exhaust rod is slidably and sealed inside the exhaust groove; the exhaust rod is connected to the inner wall of the exhaust groove by a connecting spring; the inner wall of the gas passage is provided with an exhaust hole that communicates with the exhaust groove; the inner wall of the gas groove is provided with an inlet hole that communicates with the connecting groove; a one-way valve is installed inside the inlet hole.

3. A sampling device for liquid chemical analysis equipment according to claim 1, characterized in that: The shielding unit includes a shielding plate; the shielding plate is rotatably and sealingly connected to the sampler body; a through hole is provided at the upper end of the shielding plate; the through hole communicates with the liquid inlet; a plug is fixedly connected to one end of the liquid extraction hose; the plug is threaded into the liquid inlet.

4. A sampling device for liquid chemical analysis equipment according to claim 1, characterized in that: The shielding unit includes a connecting nozzle; the connecting nozzle is slidably and sealingly connected to the liquid inlet; the mounting column has a chamber communicating with the liquid inlet; the connecting nozzle is connected to the inner wall of the chamber by a support spring; and a T-shaped hole is provided on the side wall of the connecting nozzle.

5. A sampling device for liquid chemical analysis equipment according to claim 1, characterized in that: One end of the liquid extraction hose is fixedly connected to a connector; the connector is threadedly connected to the connecting nozzle.

6. A sampling device for liquid chemical analysis equipment according to claim 3, characterized in that: The sampling tube has a flange at its upper end; a support plate is slidably connected inside the sampler body; a loading port is opened on the surface of the support plate; the loading port is used to load the sampling tube; a steel wire rope is fixedly connected to the upper end of the support plate; a sliding groove is opened on the surface of the sampler body; a slider is slidably connected in the sliding groove; the end of the steel wire rope away from the support plate is fixedly connected to the slider; a magnet is embedded in the lower end of the sliding groove.

7. A sampling device for liquid chemical analysis equipment according to claim 6, characterized in that; The inner wall of the loading port is provided with a groove; a damping block is slidably connected in the groove; the damping block is connected to the bottom of the groove by a limiting spring.

8. A sampling device for liquid chemical analysis equipment according to claim 1, characterized in that: The lower end of the sampler body is rotatably connected to a support cylinder; the sampling tube is located inside the support cylinder.

9. A sampling device for liquid chemical analysis equipment according to claim 1, characterized in that: The upper end of the mounting column is provided with an air chamber that communicates with the annular groove, and the air chamber is connected to the air extraction hole; a sealing cap is threaded to the upper port of the air chamber; and a partition plate is slidably sealed to the inner wall of the air chamber.

10. A sampling device for liquid chemical analysis equipment according to claim 9, characterized in that: A float plate is installed at the lower end of the air chamber, and the float plate is slidably connected to the air extraction hole.

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