Liquid sampler

Abstract

The utility model provides a liquid sampler, which belongs to the technical field of liquid sampling in chemical analysis, and comprises a pipe body, a liquid sampling pipe, a liquid sampling pipe, a liquid sampling pipe, a liquid sampling pipe and a liquid sampling pipe, and is characterized in that the pipe body is of a hollow and telescopic structure; a baffle is fixedly connected to the top of the pipe body, and the pipe body is in sealed connection with the baffle. A blocking plate is arranged at the bottom of the tube body, and the tube body, the baffle and the blocking plate are matched to form a cavity for containing a sample; a sample inlet is formed in the center of the blocking plate; the outer side of the sample inlet of the blocking plate is further connected with a layer of detachable silica gel pad through a fixing mechanism, the diameter of the silica gel pad is not smaller than that of the sample inlet, and the silica gel pad can be matched with the sample inlet in a sealing mode; the inner side of the silica gel pad is connected with one end of a pull rope, and the other end of the pull rope penetrates through the pipe body and the baffle and extends to the outer side of the baffle. The pipe body, the baffle, the blocking plate and the pull rope are all made of stainless steel. The liquid sampler is simple to operate, convenient and fast, and strong in practicability, the obtained sample is more representative, the analysis data is stable, and the precision is high.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid sampling for chemical analysis, in particular to a liquid sampler. Background Art

[0002] In chemical production and other production fields, sample analysis first requires sampling. Therefore, sampling is a crucial step in the analysis process, and a sampler is a mechanical device used for sampling. Liquids, especially mixed liquids composed of substances with significantly different solubilities, experience a gradient in density as the mixture changes height during storage or transport in tank trucks.

[0003] Taking dilute butanol as an example, during the aldehyde-acetylene process (Reppe process) to produce 1,4-butanediol, the output from the distillation dehydration tower and the butanol tower primarily contains n-butanol, water, and a small amount of impurities. Since the target content of this material is n-butanol, it is usually defined as dilute butanol. However, since the miscibility of n-butanol and water varies with temperature, with the exception of the pure butanol extracted from the butanol tower, which has a water content of less than 0.20%, the remaining dilute butanol byproducts extracted during the distillation process are all mixtures of butanol and water. This butanol-water mixture can exhibit different states depending on its miscibility, specifically classified into the following situations:

[0004] 1. Clear Solution: When a small amount of butanol is dissolved in water, or vice versa, the system may appear clear. For example, at 20°C, the solubility of n-butanol in water is 7.7%. If the amount of butanol is within this solubility, the system may initially appear turbid, but will generally become clear after sufficient stirring. Similarly, the solubility of water in butanol is higher, at 20.1%, and mixing within this solubility range will also form a clear solution.

[0005] 2. Turbid or emulsified state: When the mixing ratio of butanol and water exceeds their respective solubility limits, the mixture may become turbid due to the density difference and incomplete mutual solubility between the two. This is because butanol and water form an inhomogeneous dispersion system rather than a uniform solution.

[0006] 3. Stratification: When butanol and water are mixed in large quantities and in an inappropriate proportion to form a single-phase solution, the system tends to separate into two distinct layers. This is because butanol and water have limited mutual solubility and different densities. The heavy butanol layer sinks to the bottom and the light water layer floats on the top.

[0007] 4. Azeotropic mixture: Under certain conditions, butanol and water can form an azeotropic mixture, meaning they boil together when heated in a certain ratio without changing their composition. At the azeotropic point, the ratio of butanol to water is approximately 78% butanol to 22% water. In this state, although the two liquids are not completely miscible, they evaporate together as a whole and can be separated again by fractional distillation. In summary, a mixture of butanol and water, or a dilute butanol material, can exhibit a clear solution, a turbid or emulsified state, separate into layers, or form an azeotropic mixture, depending on the ratio.

[0008] In the production fields such as chemical industry, the material similar to dilute butanol material also has a lot, and this type of material, when transporting or storing, wants to accurately test the content of a certain substance therein, first sampling step must be rigorous, ensure that the sample material adopted must be representative. At present, there is no special sampler for the above-mentioned materials, and conventional sampling method has two kinds: the first is to stir before sampling, and then sample after the liquid sample is mixed, but the time and effect of stirring can directly affect the representativeness of sampling; the second is to use tools such as oil dipsticks, take equal portions of samples at three different heights, upper, middle and lower, and then mix three samples again, this method is fixed-point sampling, but the average sample obtained lacks credibility, and representativeness is not strong, and error is large, and operation is also inconvenient. Therefore, for the liquid material with stratification phenomenon or uneven distribution itself, a special sampler is designed for similar dilute butanol material, to take representative sample, to avoid sample detection data distortion, the error of analysis result is too large, which is a problem urgently needed to be solved in this area. Utility Model Content

[0009] The utility model provides a liquid sampler to solve the problem that there is no sampler in the prior art for sampling liquid materials with stratification or uneven distribution, which makes the sampling of the existing sampler unrepresentative, resulting in distortion of sample detection data and excessive error in analysis results.

[0010] Specifically, the utility model provides a liquid sampler, comprising: a tube body, which is a hollow structure and is arranged as a retractable structure; a baffle is fixedly connected to the top of the tube body, and the tube body and the baffle are sealed together; a blocking plate is arranged at the bottom of the tube body, and the tube body, the baffle and the blocking plate cooperate to form a cavity for holding the sample; an injection port is opened at the center of the blocking plate; a layer of detachable silicone pad is also connected to the outside of the injection port of the blocking plate through a fixing mechanism, the diameter of the silicone pad is not less than the diameter of the injection port, and the silicone pad can be sealed with the injection port; one end of a pull rope is connected to the inner side of the silicone pad, and the other end of the pull rope passes through the tube body and the baffle, extending to the outside of the baffle, and the length of the pull rope is greater than the length of the tube body; the tube body, the baffle, the blocking plate and the pull rope are all made of stainless steel.

[0011] Preferably, the tube body includes a top tube, a sampling tube and at least one connecting rod that are slidably nested; the bottom of the top tube is provided with an internal thread, the top of the sampling tube is provided with an external thread, and the two ends of the connecting rod are respectively provided with an internal thread and an external thread, and the internal thread and the external thread match so that the adjacent top tubes and connecting rods, and the connecting rods and the sampling tubes are connected by threads; and the cross-sectional diameters of the top tube, the connecting rod and the sampling tube meet the requirements of being nested in sequence.

[0012] Preferably, a wire reel is provided on the outside of the baffle, and the pull rope located on the outside of the baffle is wound on the rotating shaft of the wire reel.

[0013] Preferably, the fixing mechanism includes a T-shaped sliding column, the end of the vertical section of the sliding column is fixedly connected to the silicone pad, and the vertical section of the sliding column is slidably connected to the blocking plate; two through holes are provided on the blocking plate, and the two through holes are symmetrically arranged about the injection port, the vertical section of the sliding column passes through the through holes, and the horizontal section of the sliding column is arranged on the side of the blocking plate away from the silicone pad; a spring is sleeved on the sliding column between the silicone pad and the blocking plate, and the two ends of the spring are respectively fixed to the silicone pad and the blocking plate.

[0014] Preferably, an exhaust hole is provided on the baffle.

[0015] Preferably, a frustum-shaped boss that can seal with the injection port is provided on the inner side of the silicone pad, and the end of the pull rope is fixed to the center of the boss.

[0016] Preferably, two longitudinal guide rods are symmetrically arranged on the top of the boss about the pull rope, and the two guide rods are connected by a cross bar, and the cross bar has no contact with the inner wall of the sample injection tube; the pull rope passes through the cross bar and is fixed to it, and the pull rope between the boss and the cross bar is in a taut state.

[0017] Preferably, a handle is provided on the upper portion of the tube body near the baffle.

[0018] The liquid sampler provided by the utility model can achieve the purpose of simultaneous mixed sampling of different liquid layer depths and various liquid layers through a retractable tube structure, in conjunction with a sampling tube, a blocking plate and a silicone pad. It can specifically sample materials with stratification or multi-phase inhomogeneity. The samples taken are more representative, and the analysis data are stable and highly precise, reducing analysis errors, thereby achieving accuracy and repeatability of the analysis results of target components in such materials.

[0019] The liquid sampler can better seal the sampling port on the blocking plate through the silicone pad with a fixing mechanism, the boss thereon, and the guiding component of the boss, and can prevent the sample in the tube body from leaking out after sampling. At the same time, when placing or sampling, the sampling port can be automatically opened to realize the sampling operation. It is easy to use and simple to operate.

[0020] The liquid sampler has a simple structure, is easy to use, easy to disassemble and clean, has strong practicality, low production cost, and is convenient for standardized operation. It can collect liquid materials at different depths and can achieve full-height sampling without disturbing the sample, eliminating the differences in the sample caused by different density gradients. It has broad application and promotion prospects and can be used for sampling liquid materials in environments such as tank trucks, pipelines, tanks, rivers, and lakes. It can also be used for sampling and analyzing liquids such as oil products and water samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic structural diagram of a liquid sampler provided in one embodiment of the present invention;

[0023] Figure 2 A schematic structural diagram of a fixing mechanism provided in one embodiment of the present utility model;

[0024] Figure 3 This is a schematic diagram of the connection between the boss on the silicone pad and its guide component provided in one embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 1. Tube body, 2. Baffle, 3. Blocking plate, 4. Inlet, 5. Silicone pad, 6. Pull rope, 7. Reel, 11. Push tube, 12. Inlet tube, 13. Connecting rod, 21. Exhaust hole, 81. Sliding column, 82. Spring, 83. Boss, 84. Guide rod, 85. Cross bar. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts also fall within the scope of protection of the present invention.

[0028] like Figure 1As shown, a liquid sampler of the present invention comprises: a tube body 1, which is a hollow structure, and the tube body 1 is arranged to be a retractable structure; a baffle 2 is fixedly connected to the top of the tube body 1, and the tube body 1 and the baffle 2 are sealed; a blocking plate 3 is arranged at the bottom of the tube body 1, and the tube body 1, baffle 2 and blocking plate 3 cooperate to form a cavity for holding the sample; an injection port 4 is opened at the center position of the blocking plate 3; a layer of detachable silicone pad 5 is also connected to the outside of the injection port 4 of the blocking plate 3 through a fixing mechanism, the diameter of the silicone pad 5 is not less than the diameter of the injection port 4, and the silicone pad 5 can be sealed with the injection port 4; one end of a pull rope 6 is connected to the inner side of the silicone pad 5, and the other end of the pull rope 6 passes through the tube body 1 and the baffle 2, extending to the outside of the baffle 2, and the length of the pull rope 6 is greater than the length of the tube body 1; the tube body 1, baffle 2, blocking plate 3 and pull rope 6 are all made of stainless steel.

[0029] Since the material to be tested is a multi-phase inhomogeneous liquid, considering the characteristics and fluidity of the material to be tested, the durability and practicality of the sampler, as well as the simplicity, practicality and economy of the materials, the tube body 1 of the sampler is preferably a seamless stainless steel tube. The length of the tube body 1 can be adjusted according to the depth of the material to be tested using a retractable structure. Preferably, when sampling, the length of the tube body 1 is greater than the depth of the material to be tested, so that the purpose of simultaneous mixed sampling of different liquid layer depths and various liquid layers can be achieved. The operation is convenient and the samples taken are more representative.

[0030] The drawstring 6 is preferably a plastic-coated steel wire rope with a diameter of 1-2 mm. By tightening or loosening the drawstring 6, the silicone pad 5 on the baffle 3 can be controlled to close or open the sampling port 4, facilitating sampling and sample storage, and providing simple and convenient operation. The sampler, which only has the sampling port 4 on the baffle 3, ensures that the material being tested is minimally disturbed during sampling, allowing the sample to reflect the true stratification. The sampling port 4 is sealed by the elastic silicone pad 5, which can deform to provide a sufficient seal against the sampling port 4.

[0031] When sampling, the above-mentioned liquid sampler loosens the pull rope 6, opens the silicone pad 5 on the baffle 3, and slowly pushes the tube body 1 vertically downward from the top of the material to be tested or its container into the material to be tested until the baffle 3 or the sampling port 4 reaches the bottom of the material to be tested. During the lowering of the tube body 1, since the sampling port 4 passes through each liquid layer in turn, and there is no pressurization or decompression mechanism in the sampler, the pressure is only discharged through the gap between the baffle 2 and the pull rope 6, so that the internal and external pressures of the sampler are the same as the pressure of the liquid layer in the material to be tested. Therefore, the materials of each liquid layer in the material to be tested can enter the cavity inside the tube body 1 when the sampling port 4 reaches the liquid layer, so that the liquid layer distribution inside the sampler is the same as the liquid layer distribution of the material to be tested. At this time, the sample in the tube body 1 is a full-height sample of the material to be tested. The sample taken can more fully reflect the quality of the material to be tested and is more representative and accurate. After sampling is completed, tighten the drawstring 6 so that the silicone pad 5 blocks the sampling port 4, then take out the tube body 1, loosen the drawstring 6, and collect the material sample in the sampler in a sampling bottle prepared in advance for analysis.

[0032] Furthermore, the tube body 1 includes a top tube 11, a sampling tube 12 and at least one connecting rod 13 that are slidably nested; the bottom of the top tube 11 is provided with an internal thread, the top of the sampling tube 12 is provided with an external thread, and the two ends of the connecting rod 13 are respectively provided with an internal thread and an external thread, and the internal thread and the external thread match so that the adjacent top tubes 11 and connecting rods 13, and the connecting rods 13 and the sampling tube 12 are connected by threads; and the cross-sectional diameters of the top tube 11, the connecting rod 13 and the sampling tube 12 meet the requirements of being nested in sequence.

[0033] A multi-section connecting rod 13 is provided between the top pipe 11 and the sampling tube 12, which can realize the expansion and contraction of the tube body 1 and can freely adjust the length of the tube body 1, so that the liquid sampler has flexibility and wider applicability, and can achieve the effect of simultaneous mixed sampling of different liquid layer depths and various liquid layers. The overall device is easy to disassemble, clean and install, and is also convenient to carry. Correspondingly, the length of the pull rope 6 is also adjustable and needs to match the length of the tube body 1. The top pipe 11, the connecting rod 13 and the sampling tube 12 are connected by threads, which has good sealing performance and can also prevent liquids from other depth layers from entering the tube body 1.

[0034] Furthermore, a cord reel 7 is provided on the outside of the baffle 2, and the draw cord 6, located outside the baffle 2, is wound around the rotating shaft of the cord reel 7. Winding the draw cord 6 on the cord reel 7 facilitates its storage and organization, and also allows for easier tightening and locking of the draw cord 6. The cord reel 7 can be of conventional construction and is not limited herein. The rotating shaft, hand crank, etc. provided on the cord reel 7 facilitate the tightening and loosening of the draw cord 6.

[0035] like Figure 2As shown, further, the fixing mechanism includes a T-shaped sliding column 81, the end of the vertical section of the sliding column 81 is fixedly connected to the silicone pad 5, and the vertical section of the sliding column 81 is slidably connected to the blocking plate 3; two through holes are opened on the blocking plate 3, and the two through holes are symmetrically arranged about the injection port 4, the vertical section of the sliding column 81 passes through the through holes, and the horizontal section of the sliding column 81 is arranged on the side of the blocking plate 3 away from the silicone pad 5; a spring 82 is sleeved on the sliding column 81 between the silicone pad 5 and the blocking plate 3, and the two ends of the spring 82 are respectively fixed to the silicone pad 5 and the blocking plate 3.

[0036] The fixing mechanism and accessories such as the spring 82 are all made of corrosion-resistant stainless steel. The fixing mechanism can guide the silicone pad 5. When the pull cord 6 is tightened, the silicone pad 5 and the injection port 4 can be sealed better and faster. When the pull cord 6 is relaxed, the silicone pad 5 can automatically spring open and open the injection port 4, which is convenient to use. Specifically, when the pull cord 6 is tightened, the silicone pad 5 is forced to move upward. Under the guidance of the sliding column 81, the silicone pad 5 blocks the injection port 4 on the blocking plate 3. At this time, the spring 82 is compressed and stressed. When the pull cord 6 is relaxed, the silicone pad 5 is no longer stressed. Under the reset action of the spring 82, the sliding column 81 moves downward, driving the silicone pad 5 to a position away from the injection port 4, opening the injection port 4 to realize the sampling operation.

[0037] like Figure 1 As shown, the baffle 2 further has an exhaust hole 21. Air exists in the cavity of the tube body 1. During the lowering of the tube body 1, the gas in the tube body 1 can be discharged through the exhaust hole 21 on the baffle 2, thereby preventing problems such as excessive air pressure in the tube body 1 leading to inaccurate sampling or difficulty in smooth operation of the tube body 1 by the operator. Furthermore, the exhaust hole 21 is provided on the top baffle 2 to prevent the exhaust from stirring the liquid layer of the material to be tested.

[0038] like Figure 3 As shown, the inner side of the silicone pad 5 is provided with a frusto-conical boss 83 that can seal with the injection port 4, and the end of the pull rope 6 is fixedly connected to the center of the boss 83. The boss 83 that matches the injection port 4 is provided on the silicone pad 5. When the injection port 4 is blocked, the boss 83 is inserted into the injection port 4, thereby improving the sealing effect of the injection port 4 and preventing the sample in the tube body 1 from leaking out.

[0039] Furthermore, two longitudinal guide rods 84 are symmetrically arranged on the top of the boss 83 with respect to the pull rope 6. The two guide rods 84 are connected by a cross bar 85, and the cross bar 85 has no contact with the inner wall of the sample injection tube 12; the pull rope 6 passes through the cross bar 85 and is fixed to it, and the pull rope 6 between the boss 83 and the cross bar 85 is in a tensioned state.

[0040] In order to facilitate the connection between the boss 83 and the injection port 4, when the pull rope 6 is tightened, the cross bar 85 thereon will be driven to move upward, and then the guide rod 84 and the boss 83 will be driven to move upward, so that the boss 83 can be directly inserted into the injection port 4 without deviation. When the pull rope 6 is relaxed, under the action of the spring 82 of the fixing mechanism, the silicone pad 5 will drive the boss 83 to move downward to open the injection port 4. The diameters of the cross bar 85 and the guide rod 84 are relatively small, and they have no contact with the inner wall of the injection tube 12, and will not affect the input and discharge of the sample at the injection port 4.

[0041] Furthermore, a handle is provided at the upper portion of the tube body 1 near the baffle 2 (conventional arrangement, not shown in the drawings).

[0042] The present invention is a liquid sampler for sampling dilute butanol from a tank truck. Because the dilute butanol in the tank truck is not uniformly mixed, a saturated liquid layer formed by butanol dissolving in water, a saturated liquid layer formed by water dissolving in butanol, and an unstable miscible liquid layer formed by the mutual dissolution of butanol and water depending on factors such as temperature will appear. Specifically, the following steps are performed: According to the height of the tank truck, a top pipe 11, a multi-section connecting rod 13, and a sampling tube 12 are threadedly connected so that the length of the tube body 1 is greater than the depth of the material to be tested. Then, a pull cord 6 is loosened by a reel 7, and a spring 82 is maintained at its natural length, so that the silicone pad 5 and its boss 83 are separated from the blocking plate 3 and the sampling port 4, thereby opening the sampling port 4.

[0043] The tube body 1 is slowly lowered vertically downward from the top of the tank truck into the material to be tested until the baffle 3 or the sampling port 4 reaches the bottom of the material to be tested. During the lowering of the tube body 1, the material in each liquid layer of the dilute butanol material to be tested can enter the cavity inside the tube body 1 when the sampling port 4 reaches the liquid layer, so that the liquid layer distribution inside the sampler is the same as the liquid layer distribution of the material to be tested. At the same time, the gas in the tube body 1 is discharged through the exhaust hole 21 on the baffle 2 to make the internal and external pressures of the sampler the same as the pressure of the liquid layer in the material to be tested.

[0044] When the blocking plate 3 or the sampling port 4 reaches the bottom of the material to be tested, the sampling is completed, and the pull rope 6 is tightened by the reel 7. The silicone pad 5 is forced to move upward. Under the guidance of the sliding column 81, the silicone pad 5 moves upward. At the same time, the pull rope 6 will drive the cross bar 85 on it to move upward, and then drive the guide rod 84 and the boss 83 to move upward, so that the boss 83 can be directly inserted into the sampling port 4. The silicone pad 5 and the boss 83 on it can seal the sampling port 4 on the blocking plate 3 and store the sample in the tube body 1.

[0045] After removing the tube body 1, the sample tube 12 is placed into a pre-prepared sampling bottle. The drawstring 6 is loosened, and the spring 82 of the fixing mechanism resets the slide post 81 downward, driving the silicone pad 5 and its boss 83 downward, opening the sample inlet 4 and releasing the sample from the sampler into the sampling bottle for subsequent analysis. The sample exhibits significant stratification, indicating a multiphase, inhomogeneous material. This reflects the true stratification of the dilute butanol material in the tank truck, making it more representative and providing more accurate analysis results.

[0046] It should be noted that the detailed structure of some devices is not described in detail in this utility model, but belongs to the prior art known to those skilled in the art, so it will not be repeated here. In addition, the parts not described in this device are the same as the prior art or can be implemented by using the prior art.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A liquid sampler, characterized in that: include: The tube body is a hollow structure, and the tube body is arranged to be a retractable structure; a baffle is fixedly connected to the top of the tube body, and the tube body and the baffle are sealed together; a plugging plate is arranged at the bottom of the tube body, and the tube body, the baffle and the plugging plate cooperate to form a cavity for holding the sample; an injection port is opened at the center position of the plugging plate; a layer of detachable silicone pad is also connected to the outside of the injection port of the plugging plate through a fixing mechanism, the diameter of the silicone pad is not less than the diameter of the injection port, and the silicone pad can be sealed with the injection port; one end of the pull rope is connected to the inner side of the silicone pad, and the other end of the pull rope passes through the tube body and the baffle, extending to the outside of the baffle, and the length of the pull rope is greater than the length of the tube body; the tube body, the baffle, the plugging plate and the pull rope are all made of stainless steel.

2. The liquid sampler according to claim 1, characterized in that The tube body includes a top tube, an injection tube and at least one connecting rod that are slidably nested; the bottom of the top tube is provided with an internal thread, the top of the injection tube is provided with an external thread, and the two ends of the connecting rod are respectively provided with the internal thread and the external thread, and the internal thread and the external thread match so that the adjacent top tubes and the connecting rods, and the connecting rods and the injection tubes are connected by threads; and the cross-sectional diameters of the top tube, the connecting rod and the injection tube meet the requirements of sequential nesting.

3. The liquid sampler according to claim 1, characterized in that A wire reel is provided on the outside of the baffle, and the pull rope located on the outside of the baffle is wound around the rotating shaft of the wire reel.

4. The liquid sampler according to claim 2, characterized in that The fixing mechanism includes a T-shaped sliding column, the end of the vertical section of the sliding column is fixedly connected to the silicone pad, and the vertical section of the sliding column is slidably connected to the blocking plate; two through holes are provided on the blocking plate, and the two through holes are symmetrically arranged about the injection port, the sliding column passes through the through holes, and the horizontal section of the sliding column is arranged on the side of the blocking plate away from the silicone pad; a spring is provided on the sliding column between the silicone pad and the blocking plate, and the two ends of the spring are respectively fixedly connected to the silicone pad and the blocking plate.

5. The liquid sampler according to claim 1, characterized in that The baffle is provided with an exhaust hole.

6. The liquid sampler according to claim 4, characterized in that A frustum-shaped boss that can be sealed and matched with the injection port is provided on the inner side of the silica gel pad, and the end of the pull rope is fixed to the center position of the boss.

7. The liquid sampler according to claim 6, characterized in that Two longitudinal guide rods are symmetrically arranged on the top of the boss with respect to the pull rope. The two guide rods are connected by a cross bar, and the cross bar has no contact with the inner wall of the injection tube; the pull rope passes through the cross bar and is fixed to it, and the pull rope between the boss and the cross bar is in a tensioned state.

8. The liquid sampler according to any one of claims 1 to 7, characterized in that: A handle is provided on the upper portion of the tube body near the baffle.

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