Bottle cap assembly and chemical online sampling device and method

Abstract

The invention relates to the technical field of chemical sampling, in particular to a bottle cap assembly and a chemical online sampling device and method. The chemical online sampling device comprises a device body, a working cavity is formed in the device body, the working cavity is sequentially provided with a sampling operation area, a sampling area and a waste liquid collecting area from top to bottom in the height direction, a sampling bottle is arranged at the sampling area, and a bottle cap assembly is arranged at the sampling bottle. According to the invention, the sampling efficiency of chemicals is improved, and the sample is prevented from being polluted by the external environment, so that the accuracy of chemical sample determination is better improved, and the method can be applied to preparation and experiments of high-purity chemicals.

Description

Technical Field

[0001] The invention relates to the technical field of chemical sampling, and in particular to a bottle cap assembly and a chemical online sampling device and method. Background Art

[0002] High-purity chemicals have good chemical properties and can be used in various fine chemical industries. However, the production process of high-purity chemicals is relatively complex and requires highly precise and strict control to ensure the purity and performance of the materials. Therefore, it is particularly important to sample and test chemicals during the production process.

[0003] The traditional chemical sampling method is generally to manually use metal or plastic containers to fill and sample the chemical production pipeline. Sampling requires experienced experimenters to perform delicate operations. However, due to the complexity of manual operations and the influence of human factors, the sampling efficiency is often low and often takes a lot of time.

[0004] In addition, chemical materials may pose potential hazards to the human body during the sampling process, especially when the chemical materials are in a high temperature or high pressure environment. Operators are easily scalded or corroded by the chemicals, which poses a greater safety risk.

[0005] Moreover, during the sampling process, the sample is often inevitably exposed to the air, which can easily cause sample contamination. For example, moisture, dust and other chemicals in the air may affect the determination of the true composition of the sample. Especially when analyzing high-purity chemicals, any tiny contamination may have a significant impact on the final analysis results. At present, the content of each component in the chemical is usually measured in PPT (parts per trillion). The results of the contaminated sample are highly biased, which seriously affects subsequent experiments and applications. Summary of the invention

[0006] The present invention provides a bottle cap assembly and a chemical online sampling device and method, which can overcome the defects of the prior art in chemical sampling, such as low efficiency, low safety and easy contamination of samples.

[0007] According to the bottle cap assembly of the present invention, it includes a detachable and mating bottle cap body and an injection tube, an opening on one side of the bottle cap body forms a first mating groove, a mating thread is formed on the side wall of the first mating groove, a feed hole and a discharge hole are formed at intervals at the bottom of the first mating groove, a one-way valve is provided at the discharge hole, a sealing mechanism is provided on the side of the feed hole close to the mating thread, the sealing mechanism includes a mechanism shell, an opening at one end of the mechanism shell forms a second mating groove, a feed tube is provided at the bottom of the second mating groove extending away from the bottom of the first mating groove, the injection tube includes a detachable and mating plug-in part and a mating part, the plug-in part is used to cooperate with the feed hole, and the mating part is used to connect with a hose, a fan-shaped sealing cover is rotatably provided at one end of the bottle cap shell away from the first mating groove, the sealing cover has a first state of abutting and mating with the plug-in part, and a second state of closing the feed hole and the discharge hole.

[0008] Preferably, a first sealing cover is slidably provided in the second mating groove, and at least two elastic strips are formed correspondingly at the bottom of the second mating groove. The elastic strips are used to maintain the tendency of the first sealing cover to press against the feed hole. The first sealing cover forms a first mating boss on the side close to the feed hole. The first mating boss is used to be plugged into and mated with the first mating hole. The first sealing cover is located on the outer periphery of the first mating boss to form a plurality of first through holes that penetrate through it.

[0009] Preferably, one end of the plug-in part is opened to form a third mating groove, and a plurality of second through holes are formed on the side wall of the third mating groove along the circumferential direction. A second sealing cover is slidably provided in the third mating groove, and the plurality of second through holes are closed when the second sealing cover abuts against the bottom of the third mating groove. A plug-in hole is provided at the bottom of the third mating groove, and a first plug pin is formed on the side of the second sealing cover close to the plug-in hole, and the first plug pin is used to cooperate with the plug-in hole. A second plug pin is provided at the first mating boss, and the second plug pin is used to cooperate with the plug-in hole after the plug-in part is inserted into the liquid inlet hole. The second sealing cover is located on the outer periphery of the first plug pin to form a plurality of third through holes.

[0010] Preferably, a snap-fit ​​groove is formed on the side wall of the sealing cover, a matching ring is correspondingly formed on the side wall of the plug-in part, a mounting groove is correspondingly provided on the side of the feed hole close to the sealing cover, the mounting groove is used to match with the matching ring, and a second matching boss is also provided on the side of the bottle cap body close to the sealing cover. When the sealing cover is in a first state, the snap-fit ​​groove is snap-fitted with the outer wall of the plug-in part, and when the sealing cover is in a second state, the snap-fit ​​groove is snap-fitted with the second matching boss.

[0011] Preferably, one end of the mating part is opened to form a fourth mating groove, and the end of the mating part away from the fourth mating groove forms a connecting head, which is used to cooperate with the hose. The connecting head is connected to the fourth mating groove, and the end of the mating part away from the connecting head is threadedly mated with the plug-in part.

[0012] According to the chemical online sampling device of the present invention, it includes the bottle cap assembly mentioned above, and also includes a device body, a working chamber is formed in the device body, and the working chamber is provided with a sampling operation area, a sampling area and a waste liquid collection area in sequence from top to bottom along the height direction, and the sampling operation area is provided with a plurality of sampling valve groups in the width direction, and the sampling valve group includes a first two-way valve and a second two-way valve which are arranged in sequence from top to bottom along the height direction, a three-way pipeline is arranged between the first two-way valve and the second two-way valve, the three-way pipeline is connected to the first two-way valve and the second two-way valve, and the three-way pipeline is also connected to a feed pipeline, and a feed valve is arranged at the feed pipeline, and the first two-way valve A U-shaped overflow pipe is provided at one end away from the second two-way valve, one end of the overflow pipe is connected to the first two-way valve, and the other end is connected to the cleaning overflow trough. A water supply pipeline is provided on the side wall of the cleaning overflow trough, and the water supply pipeline is used to input pure water. A third two-way valve is provided on the water supply pipeline. A first waste liquid collecting pipeline is provided on the side of the cleaning overflow trough away from the overflow pipe, and a fourth two-way valve is provided at the first waste liquid collecting pipeline. A sampling bottle is provided at the sampling area, and a bottle cap assembly is connected to the top of the sampling bottle, and the bottle cap assembly is used to be connected to the second two-way valve. A second waste liquid collecting pipeline is provided at the bottom of the waste liquid collecting area, and a fifth two-way valve is connected to the second waste liquid collecting pipeline.

[0013] Preferably, at least one first waste liquid collection bucket is provided on one side of the device body, and the first waste liquid collection bucket is connected to the fourth two-way valve.

[0014] Preferably, a mesh plate connected to the waste liquid collection area is provided under the sampling bottle, the bottom of the waste liquid collection area is funnel-shaped, the second waste liquid collection pipeline is arranged at the lowest point of the waste liquid collection area, and a second waste liquid collection barrel is provided on one side of the device body, and the second waste liquid collection barrel is connected to the fifth two-way valve.

[0015] Preferably, an exhaust duct is provided on the side wall of the sampling area, an exhaust valve is provided on the exhaust duct, and the height of the exhaust valve is higher than the top of the sampling area.

[0016] The chemical online sampling method according to the present invention is applied to the above-mentioned chemical online sampling device, comprising the following steps: S1: Connect the sampling bottle to the bottle cap body, insert the injection tube into the feed hole and rotate the sealing cover to put the sealing cover in the first state; S2: Open the third two-way valve to allow the pure water to fill the cleaning overflow tank; S3: Open the fourth two-way valve, and keep the opening of the third two-way valve smaller than that of the fourth two-way valve for at least 30 seconds; S4: close the fourth two-way valve, open the first two-way valve and the second two-way valve, so that pure water enters the sampling bottle and the waste liquid collection area; S5: close the second two-way valve, and open the fourth two-way valve and the feed valve at the same time, so that pure water flows out of the cleaning overflow tank and the liquid chemical fills the cleaning overflow valve, and then close the fourth two-way valve; S6: Close the first two-way valve, open the second two-way valve, and allow the liquid chemical to enter the sampling bottle and overflow for at least 3 minutes; S7: close the second two-way valve and the feed valve, open the fifth two-way valve, and discharge the liquid in the waste liquid collection area; S8: Turn the sealing cover, take out the injection tube, put the sealing cover in the second state, take out the sampling bottle, and complete the online sampling of chemicals.

[0017] Beneficial effects: 1. The present invention simplifies the sampling process through the detachable bottle cap body and the injection tube, and the rotation operation of the sealing cap, reduces the complicated manual operation steps, and thus greatly improves the sampling efficiency.

[0018] 2. The design of the present invention clearly separates the sampling operation area, the sampling area and the waste liquid collection area, so that operators can perform sampling operations in a relatively safe and controlled environment, reducing the time of human intervention in the sampling process and further improving efficiency.

[0019] 3. The chemical injection process of the present invention does not require human intervention, which effectively reduces the risk of operators being exposed to chemicals, improves the safety of chemical sampling, and avoids chemical leakage.

[0020] 4. The present invention ensures the isolation of the sample from the external environment during the sampling process through the sealing design of the bottle cap assembly, reduces the risk of the sample being contaminated by contact with the air, and thus avoids the influence of contamination on the analysis results.

[0021] 5. The water supply pipeline of the present invention can input pure water to flush the overflow tank, overflow pipe and sampling bottle, thereby ensuring the purity of the sampling bottle environment, so that when liquid chemicals are injected into the sampling bottle, the pure water in the sampling bottle can be better discharged to obtain chemical samples.

[0022] 6. The present invention allows the chemical sample to enter the cleaning overflow tank first, thereby preventing the sampling valve group from being mixed with pure water or impurities that may affect the purity of the final sample.

[0023] 7. The sealing cap of the present invention can fix the injection tube to the bottle cap body, thereby facilitating the injection of liquid chemicals, and can also seal the feed hole and the discharge hole, thereby facilitating transportation and storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the main view of the chemical online sampling device; Figure 2 It is a left side schematic diagram of a chemical online sampling device; Figure 3 for Figure 2 Middle AA section view; Figure 4 It is an axonometric diagram of the bottle cap assembly in the first state; Figure 5 It is an axonometric diagram of the bottle cap assembly in the second state; Figure 6 It is an axonometric diagram of the bottle cap body; Figure 7 This is a schematic diagram of the explosion of the bottle cap body; Figure 8 It is the axonometric diagram of the mechanism housing; Fig. 9 is an axonometric schematic diagram of the first blocking cover; Fig.10 This is an axonometric diagram of the injection pipe; Fig.11 This is a schematic diagram of the injection pipe explosion; Fig.12 is an axonometric schematic diagram of the second blocking cover; Fig.13 It is an axonometric diagram of the mating part. DETAILED DESCRIPTION

[0025] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it.

[0026] Example 1 Please refer to Figure 1-3The present embodiment provides an online chemical sampling device, which includes a device body 1, a working chamber is formed in the device body 1, and a sampling operation area 201, a sampling area 202 and a waste liquid collection area 203 are sequentially arranged in the height direction from top to bottom in the working chamber, and the sampling operation area 201 is provided with four sampling valve groups along the width direction, and the sampling valve group includes a first two-way valve 301 and a second two-way valve 304 which are sequentially arranged in the height direction from top to bottom, and a three-way pipe 302 is arranged between the first two-way valve 301 and the second two-way valve 304, and the three-way pipe 302 is connected to the first two-way valve 301 and the second two-way valve 304, and the three-way pipe 302 is also connected to a feed pipeline 303, and a feed valve is arranged at the feed pipeline 303, and the first two-way valve 301 is far away from the second two-way valve 304 at one end A U-shaped overflow pipe 305 is provided, one end of the overflow pipe 305 is connected to the first two-way valve 301, and the other end is connected to the cleaning overflow tank 101. A water supply pipeline 102 is provided on the side wall of the cleaning overflow tank 101. The water supply pipeline 102 is used to input pure water. A third two-way valve 103 is provided at the water supply pipeline 102. A first waste liquid collecting pipeline 104 is provided on the side of the cleaning overflow tank 101 away from the overflow pipe 305. A fourth two-way valve 105 is provided at the first waste liquid collecting pipeline 104. A sampling bottle 4 is provided at the sampling area 202. A bottle cap assembly 5 is connected to the top of the sampling bottle 4. The bottle cap assembly 5 is used to be connected to the second two-way valve 304. A second waste liquid collecting pipeline 601 is provided at the bottom of the waste liquid collecting area 203. A fifth two-way valve 602 is connected to the second waste liquid collecting pipeline 601.

[0027] According to the solution provided in this embodiment, the water supply pipeline 102 can input pure water to rinse the overflow tank 101, the overflow pipe 305 and the sampling bottle 4, thereby ensuring the purity of the environment of the sampling bottle 4. It can be understood that the liquid chemicals suitable for this embodiment are insoluble in pure water, and the density of the liquid chemicals is greater than the density of pure water. Therefore, when the liquid chemicals are injected into the sampling bottle 4, the pure water in the sampling bottle 4 can be better discharged to obtain a chemical sample.

[0028] That is, when in use, before the liquid chemical is input into the sampling bottle 4, the cleaning overflow tank 101, the overflow pipe 305 and the sampling bottle 4 are all filled with pure water. At this time, the second two-way valve 304 is closed and the feed valve and the fourth two-way valve 105 are opened. When the pure water flows out of the cleaning overflow tank 101, the liquid chemical is sucked into the cleaning overflow tank 101 to replace the original pure water, thereby discharging the pure water in the cleaning overflow tank 101. When the liquid chemical fills the cleaning overflow tank 101, the fourth two-way valve 105 is closed, and then the second two-way valve 304 is opened to allow the liquid chemical to enter the sampling bottle 4 to replace the pure water in the sampling bottle 4, thereby better realizing the online sampling of the liquid chemical without contacting the air.

[0029] By filling the cleaning overflow tank 101 with liquid chemicals, the pure water between the first two-way valve 301 and the three-way valve is exhausted, thereby ensuring the purity of the liquid chemicals input into the sampling bottle 4 .

[0030] In addition, in this embodiment, there is no need to manually perform online infusion of samples, which effectively reduces the risk of sampling. The user only needs to replace the sampling bottle 4, and the harm to the human body is also relatively small.

[0031] It can be understood that the sampling operation area 201 and the sampling area 202 are divided into four independent areas, and both are equipped with rotatable cabinet doors to facilitate user operation.

[0032] See Figure 2 Two first waste liquid collection barrels 701 are also provided on one side of the device body 1. The first waste liquid collection barrel 701 is connected to the fourth two-way valve 105, so that the pure water and other impurities in the overflow tank 101 can be collected in the first waste liquid collection barrel 701 for collection.

[0033] Further, see Figure 3 A mesh plate 204 connected to the waste liquid collection area 203 is provided below the sampling bottle 4. The bottom of the waste liquid collection area 203 is funnel-shaped. The second waste liquid collection pipeline 601 is arranged at the lowest point of the waste liquid collection area 203. A second waste liquid collection barrel 702 is provided on one side of the device body 1. The second waste liquid collection barrel 702 is connected to the fifth two-way valve 602.

[0034] Among them, the mesh plate 204 below the sampling bottle 4 is used to allow the pure water or liquid chemicals overflowing from the sampling bottle 4 to flow into the waste liquid collection area 203. When the sampling is completed, the fifth two-way valve 602 is opened to allow the waste liquid in the waste liquid collection area 203 to enter the fifth two-way valve 602.

[0035] An exhaust pipe 801 is provided on the side wall of the sampling area 202, and an exhaust valve 802 is provided at the exhaust pipe 801. The exhaust valve 802 is set at a height higher than the top of the sampling area 202. The exhaust valve 802 can discharge the gas in the waste liquid collection area 203, thereby preventing the pressure in the waste liquid collection area 203 from being too high.

[0036] It is understandable that the sampling bottle 4 and the bottle cap assembly 5 are both made of polytetrafluoroethylene (PFA). PFA has extremely high chemical inertness and hardly reacts with any chemical substances. Therefore, it will not react with high-purity chemicals, contaminate samples or change the chemical properties of samples.

[0037] Example 2 See Figure 4-13The present embodiment provides an online chemical sampling device, which is different from the online chemical sampling device in embodiment 1 in that the bottle cap assembly 5 includes a detachable bottle cap body 51 and an injection tube 52, one side of the bottle cap body 51 is opened to form a first matching groove 5121, the side wall of the first matching groove 5121 forms a matching thread 5122, the bottom of the first matching groove 5121 is spaced to form a feed hole 5123 and a discharge hole 5124, a one-way valve is provided at the discharge hole 5124, and a blocking mechanism is provided on the side of the feed hole 5123 close to the matching thread 5122, the blocking mechanism includes a mechanism housing 513, and a mechanism housing One end of 513 is open to form a second matching groove 5131, and a feed pipe 5132 is provided at the bottom of the second matching groove 5131 and extends away from the bottom of the first matching groove 5121. The injection pipe 52 includes a detachable plug-in portion 521 and a matching portion 522, the plug-in portion 521 is used to match with the feed hole 5123, and the matching portion 522 is used to connect with a hose. A fan-shaped sealing cover 511 is rotatably provided at one end of the bottle cap shell away from the first matching groove 5121, and the sealing cover 511 has a first state of abutting and matching with the plug-in portion 521, and a second state of closing the feed hole 5123 and the discharge hole 5124.

[0038] According to the scheme provided in this embodiment, the mating thread 5122 can be matched with the bottle mouth thread of the sampling bottle 4, so as to realize the installation of the bottle cap body 51, one end of the injection tube 52 is connected to the second two-way valve 304, and the other end is inserted into the feed hole 5123 to fill the sampling bottle 4, and the discharge hole 5124 is used to discharge the liquid in the sampling bottle 4. By setting a one-way valve at the discharge hole 5124, gas and liquid can only exit but not enter at the discharge hole 5124, which can effectively prevent external air from mixing into the sampling bottle 4. The sealing cover 511 can fix the injection tube 52 to the bottle cap body 51, so as to facilitate the injection of liquid chemicals, and can also close the feed hole 5123 and the discharge hole 5124, so as to facilitate transportation and storage.

[0039] Among them, a first sealing cover 514 is slidably provided in the second matching groove 5131, and three elastic strips 5133 are correspondingly formed at the bottom of the second matching groove 5131. The elastic strips 5133 are used to maintain the tendency of the first sealing cover 514 to press against the feed hole 5123. The first sealing cover 514 forms a first matching boss 5141 on the side close to the feed hole 5123. The first matching boss 5141 is used to be plugged into and cooperated with the first matching hole. The first sealing cover 514 is located on the outer periphery of the first matching boss 5141 to form a plurality of penetrating first through holes 5142.

[0040] Furthermore, one end of the plug-in portion 521 is opened to form a third mating groove 5211, and a plurality of second through holes 5212 are formed on the side wall of the third mating groove 5211 along the circumferential direction. A second blocking cover 523 is slidably provided in the third mating groove 5211, and the plurality of second through holes 5212 are closed when the second blocking cover 523 abuts against the bottom of the third mating groove 5211. A plug hole 5214 is provided at the bottom of the third mating groove 5211, and a first plug pin 5231 is formed on the side of the second blocking cover 523 close to the plug hole 5214, and the first plug pin 5231 is used to cooperate with the plug hole 5214. A second plug pin 5143 is provided at the first mating boss 5141, and the second plug pin 5143 is used to cooperate with the plug hole 5214 after the plug-in portion 521 is inserted into the liquid inlet hole. The second blocking cover 523 is located on the outer periphery of the first plug pin 5231 to form a plurality of third through holes 5232.

[0041] In addition, a snap-fit ​​groove 5111 is formed on the side wall of the sealing cover 511, and a matching ring 5213 is correspondingly formed on the side wall of the plug-in portion 521. A mounting groove 5125 is correspondingly provided on the side of the feed hole 5123 close to the sealing cover 511, and the mounting groove 5125 is used to cooperate with the matching ring 5213. A second matching boss 5126 is also provided on the side of the bottle cap body 51 close to the sealing cover 511. When the sealing cover 511 is in the first state, the snap-fit ​​groove 5111 is snap-fitted with the outer wall of the plug-in portion 521. When the sealing cover 511 is in the second state, the snap-fit ​​groove 5111 is snap-fitted with the second matching boss 5126.

[0042] That is, when in use, the plug-in portion 521 of the injection tube 52 is inserted into the feed hole 5123, so that the matching ring 5213 abuts against the mounting groove 5125, and the sealing cover 511 is rotated to make the clamping groove 5111 clamp with the plug-in portion 521, so that the injection tube 52 remains connected to the bottle cap body 51, which is the first state. At this time, the end of the plug-in portion 521 enters the second matching groove 5131, and the second through hole 5212 is located in the second matching groove 5131. Under the action of the elastic member, the first blocking cover 514 abuts against the plug-in portion 521. At the end, the second plug pin 5143 is inserted into the plug hole 5214 and squeezes the first plug pin 5231 of the second blocking cover 523, so that the second blocking cover 523 moves away from the plug hole 5214, so that the second through hole 5212 is connected, so that the liquid chemical can flow from the third through hole 5232 through the second through hole 5212 and the first through hole 5142 and finally enter the bottom of the sampling bottle 4 through the feeding tube 5132, thereby better realizing the replacement of water in the sampling bottle 4 and completing the filling and sampling of the sampling bottle 4.

[0043] When the infusion is completed, the sealing cover 511 is rotated to separate the sealing cover 511 from the matching ring 5213. At this time, under the action of the elastic member, the first matching boss 5141 of the first sealing cover 514 blocks the feed hole 5123. At the same time, the injection tube 52 is pulled out to allow the second sealing cover 523 to block the second through hole 5212 and the plug hole 5214 under the action of gravity. Then, the sealing cover 511 is rotated to connect the snap-in groove 5111 with the second matching boss 5126, so that the feed hole 5123 and the discharge hole 5124 are sealed. At this time, the sampling of liquid chemicals is completed.

[0044] During this process, liquid chemicals enter the sampling bottle 4 from the feed hole 5123, enter the bottom of the sampling bottle 4 along the feed pipe 5132, and discharge pure water from the sampling bottle 4. During this process, the liquid chemicals do not come into contact with the outside air. When the injection tube 52 is finally taken out, the feed hole 5123 is immediately blocked by the elastic sheet and the first blocking cover 514 to avoid mixing with air. The feed hole 5123 and the discharge hole 5124 are blocked by the sealing cover 511 to isolate the air for easy transportation and storage.

[0045] See Fig.11 and 13 One end of the mating portion 522 is open to form a fourth mating groove 5221, and one end of the mating portion 522 away from the fourth mating groove 5221 forms a connecting head 5222, which is used to cooperate with the hose. The connecting head 5222 is connected to the fourth mating groove 5221, and one end of the mating portion 522 away from the connecting head 5222 is threadedly mated with the plug-in portion 521.

[0046] Specifically, when injecting chemicals into the sampling bottle 4, the hose is connected to the second two-way valve 304, and when outputting chemicals in the sampling bottle 4, the hose is connected to the syringe or the liquid pump. During output, extraction is stopped when the liquid level reaches 1 cm from the bottom of the sampling bottle 4, thereby avoiding contamination of high-purity chemicals and greatly improving the credibility of detection.

[0047] Example 3 This embodiment provides a chemical online sampling method, which can be applied to the chemical online sampling device in Embodiment 2, and includes the following steps: S1: Connect the sampling bottle 4 to the bottle cap body 51, insert the injection tube 52 into the feed hole 5123 and rotate the sealing cover 511 to put the sealing cover 511 in the first state; S2: Open the third two-way valve 103 to fill the cleaning overflow tank 101 with pure water. This step is used to preliminarily soak the cleaning overflow tank 101 to dissolve impurities that are easily soluble in water and reduce the bonding strength of impurities bonded to the cleaning overflow tank 101. S3: Open the fourth two-way valve 105, and keep the opening of the third two-way valve 103 smaller than that of the fourth two-way valve 105 for 30 seconds. This step is to flush the impurities in the overflow tank 101 by positive pressure. S4: close the fourth two-way valve 105, open the first two-way valve 301 and the second two-way valve 304, and allow the pure water to enter the sampling bottle 4 and the waste liquid collection area 203. This step is to rinse the sampling bottle 4 and fill the overflow tank 101 with pure water at the same time; S5: close the second two-way valve 304, and open the fourth two-way valve 105 and the feed valve at the same time, so that the pure water flows out of the cleaning overflow tank 101 and the liquid chemical fills the cleaning overflow tank 101, and then close the fourth two-way valve 105. This step is used to discharge the pure water in the cleaning overflow tank 101 and fill the cleaning overflow tank 101 with liquid chemicals. Since the height of the fourth two-way valve 105 is lower than the feed valve, even if the density of the liquid chemical is greater than that of the pure water, the pure water can still flow out of the cleaning overflow tank 101 completely and be replaced by the liquid chemical. S6: close the first two-way valve 301, open the second two-way valve 304, and allow the liquid chemical to enter the sampling bottle 4 and overflow for 3 minutes. This step is used to drain the pure water in the sampling bottle 4; S7: close the second two-way valve 304 and the feed valve, open the fifth two-way valve 602, and discharge the liquid in the waste liquid collection area 203. This step is used to discharge the mixture of chemicals, pure water and impurities in the waste liquid collection area 203; S8: Rotate the sealing cover 511, take out the injection tube 52, put the sealing cover 511 in the second state, take out the sampling bottle 4, and complete the online sampling of chemicals.

[0048] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments based on one or several embodiments provided in the present application, and these embodiments do not exceed the protection scope of the present application.

[0049] Working principle: When injecting liquid chemicals, the present invention first removes impurities by flushing the cleaning overflow tank 101 and the sampling bottle 4, and then replaces pure water with the liquid chemicals, so that high-purity chemicals are safely and efficiently collected. In addition, during the process of injecting into the sampling bottle 4, the liquid chemicals are not exposed to external air, so that the collected liquid chemicals are not mixed with impurities due to sampling reasons, so that more reliable analysis data can be obtained in subsequent component determination.

[0050] Among them, the bottle cap assembly 5 is provided with a detachable bottle cap body 51 and an injection tube 52. After the injection tube 52 is inserted into the liquid inlet, the sealing cover 511 is rotated to make the clamping groove 5111 clamped with the plug-in part 521, so that the injection tube 52 is connected with the liquid inlet, and the liquid chemical can enter the sampling bottle 4. When the injection tube 52 is pulled out of the sampling bottle 4, the sealing cover 511 is rotated to separate the clamping groove 5111 from the plug-in part 521. At this time, the first blocking cover 514 blocks the liquid inlet under the action of the elastic sheet, and then the sealing cover 511 is rotated to make the clamping groove 5111 clamped with the second matching boss 5126, so as to realize the closure of the liquid inlet and the liquid outlet, thereby better realizing the sampling of chemicals.

[0051] The present invention and its implementation methods are described schematically above, and the description is not restrictive. The embodiments shown in the embodiments are only part of the implementation methods of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by the embodiments and designs a structure and an implementation method similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the protection scope of the present invention.

Claims

1. Bottle cap assembly, characterized in that: The invention comprises a detachable and mating bottle cap body and an injection tube, wherein an opening on one side of the bottle cap body forms a first mating groove, a mating thread is formed on the side wall of the first mating groove, a feed hole and a discharge hole are formed at intervals at the bottom of the first mating groove, a one-way valve is provided at the discharge hole, a sealing mechanism is provided at the side of the feed hole close to the mating thread, the sealing mechanism comprises a mechanism housing, an opening at one end of the mechanism housing forms a second mating groove, a feed tube extending away from the bottom of the first mating groove is provided at the bottom of the second mating groove, the injection tube comprises a detachable and mating plug-in portion and a mating portion, the plug-in portion is used to mating with the feed hole, and the mating portion is used to connect with a hose, a fan-shaped sealing cover is rotatably provided at one end of the bottle cap housing away from the first mating groove, the sealing cover has a first state of abutting and mating with the plug-in portion, and a second state of closing the feed hole and the discharge hole.

2. The bottle cap assembly according to claim 1, characterized in that: A first sealing cover is slidably provided in the second matching groove, and at least two elastic strips are formed correspondingly at the bottom of the second matching groove. The elastic strips are used to keep the first sealing cover against the feed hole. A first matching boss is formed on the side of the first sealing cover close to the feed hole. The first matching boss is used to be plugged into and cooperate with the first matching hole. The first sealing cover is located on the outer periphery of the first matching boss to form a plurality of first through holes that penetrate through it.

3. The bottle cap assembly according to claim 2, characterized in that: One end of the plug-in part is opened to form a third matching groove, and the side wall of the third matching groove forms multiple second through holes along the circumferential direction. A second sealing cover is slidably provided in the third matching groove, and the multiple second through holes are closed when the second sealing cover abuts against the bottom of the third matching groove. A plug-in hole is provided at the bottom of the third matching groove, and a first plug pin is formed on the side of the second sealing cover close to the plug-in hole. The first plug pin is used to cooperate with the plug-in hole. A second plug pin is provided at the first matching boss. The second plug pin is used to cooperate with the plug-in hole after the plug-in part is inserted into the liquid inlet hole. The second sealing cover is located on the outer periphery of the first plug pin to form multiple third through holes.

4. The bottle cap assembly according to claim 1, characterized in that: A snap-fit ​​groove is formed on the side wall of the sealing cover, a matching ring is formed on the side wall of the plug-in part, a mounting groove is provided on the side of the feed hole close to the sealing cover, the mounting groove is used to match with the matching ring, and a second matching boss is also provided on the side of the bottle cap body close to the sealing cover. When the sealing cover is in the first state, the snap-fit ​​groove is snap-fitted with the outer wall of the plug-in part, and when the sealing cover is in the second state, the snap-fit ​​groove is snap-fitted with the second matching boss.

5. The bottle cap assembly according to claim 1, characterized in that: One end of the mating part is opened to form a fourth mating groove, and one end of the mating part away from the fourth mating groove forms a connecting head, which is used to cooperate with the hose. The connecting head is connected to the fourth mating groove, and one end of the mating part away from the connecting head is threadedly mated with the plug-in part.

6. A chemical online sampling device, comprising the bottle cap assembly according to any one of claims 1 to 5, characterized in that: The device also includes a device body, a working chamber is formed in the device body, and a sampling operation area, a sampling area and a waste liquid collection area are arranged in sequence from top to bottom in the height direction of the working chamber, and a plurality of sampling valve groups are arranged in the sampling operation area along the width direction, and the sampling valve group includes a first two-way valve and a second two-way valve which are arranged in sequence from top to bottom in the height direction, and a three-way pipeline is arranged between the first two-way valve and the second two-way valve, and the three-way pipeline is connected to the first two-way valve and the second two-way valve, and the three-way pipeline is also connected to a feed pipeline, and a feed valve is arranged at the feed pipeline, and a U-shaped pipe is arranged at one end of the first two-way valve away from the second two-way valve shaped overflow pipe, one end of the overflow pipe is connected to the first two-way valve, and the other end is connected to the cleaning overflow tank, a water supply pipeline is provided on the side wall of the cleaning overflow tank, the water supply pipeline is used to input pure water, a third two-way valve is provided on the water supply pipeline, a first waste liquid collecting pipeline is provided on the side of the cleaning overflow tank away from the overflow pipe, a fourth two-way valve is provided at the first waste liquid collecting pipeline, a sampling bottle is provided at the sampling area, a bottle cap assembly is connected to the top of the sampling bottle, the bottle cap assembly is used to be connected to the second two-way valve, a second waste liquid collecting pipeline is provided at the bottom of the waste liquid collecting area, and a fifth two-way valve is connected to the second waste liquid collecting pipeline.

7. The chemical online sampling device according to claim 5, characterized in that: At least one first waste liquid collection bucket is also provided on one side of the device body, and the first waste liquid collection bucket is connected to the fourth two-way valve.

8. The chemical online sampling device according to claim 5, characterized in that: A mesh plate connected to the waste liquid collection area is provided under the sampling bottle. The bottom of the waste liquid collection area is funnel-shaped. The second waste liquid collection pipeline is arranged at the lowest point of the waste liquid collection area. A second waste liquid collection barrel is provided on one side of the device body. The second waste liquid collection barrel is connected to the fifth two-way valve.

9. The chemical online sampling device according to claim 5, characterized in that: An exhaust pipe is arranged on the side wall of the sampling area, an exhaust valve is arranged on the exhaust pipe, and the height of the exhaust valve is higher than the top of the sampling area.

10. A chemical online sampling method, applied to the chemical online sampling device according to any one of claims 6 to 9, characterized in that: The steps include: S1: Connect the sampling bottle to the bottle cap body, insert the injection tube into the feed hole and rotate the sealing cover to put the sealing cover in the first state; S2: Open the third two-way valve to allow the pure water to fill the cleaning overflow tank; S3: Open the fourth two-way valve, and keep the opening of the third two-way valve smaller than that of the fourth two-way valve for at least 30 seconds; S4: close the fourth two-way valve, open the first two-way valve and the second two-way valve, so that pure water enters the sampling bottle and the waste liquid collection area; S5: close the second two-way valve, and open the fourth two-way valve and the feed valve at the same time, so that pure water flows out of the cleaning overflow tank and the liquid chemical fills the cleaning overflow valve, and then close the fourth two-way valve; S6: Close the first two-way valve, open the second two-way valve, and allow the liquid chemical to enter the sampling bottle and overflow for at least 3 minutes; S7: close the second two-way valve and the feed valve, open the fifth two-way valve, and discharge the liquid in the waste liquid collection area; S8: Turn the sealing cover, take out the injection tube, put the sealing cover in the second state, take out the sampling bottle, and complete the online sampling of chemicals.

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