Intermittent on-line safe sampling structure for chemical wastewater

Abstract

The utility model relates to the technical field of sampling, and discloses a chemical wastewater intermittent on-line safe sampling structure which comprises an on-line sampling valve body, the bottom end of the on-line sampling valve body is fixedly connected with a discharging pipe, a bottle body is arranged below the discharging pipe, and the bottle body is connected with a sampling valve. And the bottle body is connected with the discharge pipe through the guide unit. According to the intermittent on-line safe sampling structure for the chemical wastewater, through the cooperation among the on-line sampling valve body, the discharge pipe, the bottle body and the material guide unit, when a wastewater sample in the bottle body is appropriate, the on-line sampling valve body and the first valve are sequentially closed, then the top end of the vertical pipe is separated from the bottom end of the first quick-plug connector, and the first quick-plug connector is connected with the discharge pipe; the sampling operation of the waste water is completed by taking away the bottle body, in the whole operation process, pungent smell of the waste water in the bottle body cannot be diffused to a sampling area, and the safety performance of operators in the sampling period is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sampling, in particular to a chemical wastewater intermittent online safe sampling structure. Background Art

[0002] Chemical wastewater refers to wastewater containing a large amount of pollutants generated by various chemical reactions, equipment cleaning, material washing, product separation and other links in the chemical production process. Chemical wastewater has complex composition, many types of pollutants, high concentrations and high toxicity. If it is directly discharged without effective treatment, it will cause serious pollution to the environment, endanger the ecosystem and human health, and affect industrial and agricultural production. Chemical wastewater can be discharged into the natural environment after treatment, but it still needs to be sampled regularly during the discharge process to verify whether it meets the emission standards.

[0003] An online sampling valve is a common sampling device that can be installed in a wastewater discharge pipeline. When needed, the valve can be opened to extract wastewater samples from the pipeline. Since it can be opened and taken at any time, intermittent sampling can be performed, that is, sampling is performed at regular intervals. At present, most common online sampling valves use glass bottles to store samples. When sampling, the mouth of the glass bottle is screwed into the bottom of the valve body, and then the valve is opened to take samples. However, the threaded connection means that only a single size of glass bottle can be used, and glass bottles have a variety of different sizes depending on the sampling volume. If the size of the glass bottle is different from the size of the threaded mouth of the online sampling valve, it cannot be connected, and the applicability is insufficient.

[0004] In order to improve the above-mentioned disadvantages, the prior art discloses an intermittent online safety sampling device for chemical wastewater, which includes an online sampling valve body, a circulation assembly, a drive assembly, and four clamping assemblies. The circulation assembly is fixedly mounted on the bottom of the online sampling valve body, the drive assembly is arranged on the circulation assembly, and the four clamping assemblies are all slidably mounted on the bottom of the circulation assembly. Although the four clamping columns that can be approached to each other can clamp glass bottles of various sizes, the applicability of the online sampling valve body is improved.

[0005] However, during the subsequent wastewater sampling operation, due to the lack of sealing structural parts at the bottle mouth, when the chemical wastewater is discharged into the bottle body, the pungent odor in it will spread to the sampling area, and the sampling workers will easily feel uncomfortable after inhaling it. Therefore, the safety performance during the chemical wastewater sampling operation needs to be improved. Utility Model Content

[0006] The purpose of the utility model is to provide a chemical wastewater intermittent online safe sampling structure, which can be equipped with a sealing structure at the mouth of the sampling bottle. When the chemical wastewater is discharged into the bottle body, the irritating odor therein will not spread to the sampling area, and the safety performance of the operating personnel during the sampling period can be improved, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a chemical wastewater intermittent online safety sampling structure, comprising: an online sampling valve body, the bottom end of the online sampling valve body is fixedly connected to a discharge pipe, a bottle body is provided below the discharge pipe, the bottle body is connected to the discharge pipe through a material guide unit, the material guide unit comprises: a circular plate, the circular plate is fixedly connected to the bottom end of the discharge pipe, a one-way valve is fixedly connected to the inside of the circular plate, the bottom end of the one-way valve is fixedly connected to a first quick-plug connector, the bottom end of the first quick-plug connector is connected to a vertical pipe, the vertical pipe is connected to the first valve and the miniature online flowmeter installed in sequence from top to bottom, two sleeve plates are provided in sequence from top to bottom on the upper inside of the bottle body, the inner wall of the sleeve plate is fixedly connected to the vertical pipe, the outer wall of the two sleeve plates is fixedly connected to a cavity ring, and the outer wall of the cavity ring is tightly pressed against the bottle body.

[0008] Preferably, a gravity block is fixedly sleeved on the bottom end of the outer wall of the vertical pipe.

[0009] Preferably, an air injection unit is provided on the upper side of the sleeve, and the air injection unit includes: a first cannula, the first cannula is fixedly connected to one side of the upper surface of the sleeve, the first cannula is communicated with the interior of the cavity ring, the top end of the first cannula is fixedly connected to a first hose, a second valve is installed on the pipeline of the first hose, the top end of the first hose is connected to a second quick-plug connector, the second quick-plug connector is fixedly connected to the circular plate, a first solenoid valve is installed on one side of the upper surface of the circular plate, a first vertical hole is provided on one side of the lower surface of the circular plate, and the air injection port of the first solenoid valve is fixedly connected to the air injection pipe.

[0010] Preferably, an exhaust unit is provided on the other side above the sleeve, and the exhaust unit includes: a second insert pipe, the second insert pipe is fixedly connected to the sleeve, the top end of the second insert pipe is fixedly connected to a second hose, a third valve is installed on the pipeline of the second hose, the top end of the second hose is connected to a third quick plug connector, the third quick plug connector is fixedly connected to the circular plate, a second solenoid valve is installed on the other side of the upper surface of the circular plate, a second vertical hole is opened on the other side of the lower surface of the circular plate, and the exhaust port of the second solenoid valve is fixedly connected to the exhaust pipe.

[0011] Preferably, the discharge pipe is a double-section structure, with a soft tube being provided between the double-section discharge pipes, and both ends of the outer wall of the soft tube being provided with pipe clamps.

[0012] Preferably, a convex cylinder is fixedly connected to the upper surface of the sleeve plate.

[0013] Preferably, a transverse hole is opened on one side of the outer wall of the circular plate, the transverse hole is communicated with the interior of the first vertical hole, and a safety valve is threadedly connected to one end of the inner wall of the transverse hole.

[0014] Compared with the existing technology, the beneficial effects of the present invention are: the chemical wastewater intermittent online safe sampling structure has the following advantages over the traditional technology:

[0015] Through the cooperation between the online sampling valve body, the discharge pipe, the bottle body and the guide unit, the online sampling valve body is first installed on the chemical wastewater flow pipeline. When the bottle body needs to be used to sample the chemical wastewater, the sampling operator takes the bottle body to the bottom of the circular plate, inserts most of the vertical pipe into the interior of the bottle body, and makes the cavity ring on the outer wall of the sleeve plate fully press against the upper wall of the bottle inner wall. At this time, the first valve and the online sampling valve body are opened in sequence, and the water pressure inside the discharge pipe begins to increase to greater than the one-way valve threshold. The wastewater begins to be discharged into the interior of the bottle body through the one-way valve, the first quick-connector, the first valve, the micro-online flowmeter and the vertical pipe. When the wastewater sample in the bottle body is appropriate, the online sampling valve body and the first valve are closed in sequence, and then the top end of the vertical pipe is separated from the bottom end of the first quick-connector, and the bottle body is removed to complete the wastewater sampling operation. During the overall operation, the pungent odor of the wastewater in the bottle body will not spread to the sampling area, and the safety performance of the operator during sampling is improved.

[0016] Through the coordination among the online sampling valve body, the discharge pipe, the bottle body, the material guide unit and the gas injection unit, after the cavity ring is located above the interior of the bottle body, the sampling operator opens the second valve and starts the first solenoid valve. The gas injection pipe begins to inject air into the interior of the cavity ring through the first hose and the first cannula. The air pressure inside the cavity ring increases and its volume increases accordingly, so as to ensure that the cavity ring can be fully pressed against the inner wall of the bottle body.

[0017] Through the coordination between the online sampling valve body, discharge pipe, bottle body, material guide unit and exhaust unit, while injecting the wastewater sample into the bottle body, the operator opens the third valve and the second solenoid valve to discharge the air pressure increased by the internal wastewater injection into the bottle body to the external waste treatment equipment, making it easier to smoothly inject an appropriate amount of wastewater into the bottle body.

[0018] Through the coordination among the online sampling valve body, the discharge pipe, the bottle body, the material guide unit and the connection unit, the flexible tube between the double-section discharge pipe can give the circular plate a certain displacement performance, making it easy to smoothly place the cavity ring above the interior of the bottle body, which can provide certain convenience for the operator during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other features, advantages, and aspects of the various embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that the originals and elements are not necessarily drawn to scale.

[0020] Figure 1This is a schematic diagram of the structure of the utility model;

[0021] Figure 2 for Figure 1 Schematic diagram of the connection structure of the discharge pipe, bottle body and circular plate;

[0022] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0024] Figure 5 for Figure 2 Enlarged view of point C in the middle.

[0025] In the figure: 1, online sampling valve body, 2, discharge pipe, 3, bottle body, 4, circular plate, 5, one-way valve, 6, first quick-connect connector, 7, vertical pipe, 8, first valve, 9, miniature online flowmeter, 10, sleeve plate, 11, cavity ring, 12, first cannula, 13, first hose, 14, second valve, 15, second quick-connect connector, 16, first solenoid valve, 17, gas injection pipe, 18, first vertical hole, 19, second cannula, 20, second hose, 21, third valve, 22, third quick-connect connector, 23, second solenoid valve, 24, exhaust pipe, 25, second vertical hole, 26, horizontal hole, 27, safety valve, 28, gravity block, 29, soft cylinder, 30, pipe clamp, 31, convex cylinder. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] See also Figure 1-Figure 5The utility model provides a technical solution: a chemical wastewater intermittent online safety sampling structure, comprising: an online sampling valve body 1, a discharge pipe 2 is fixedly connected to the bottom end of the online sampling valve body 1, a bottle body 3 is provided below the discharge pipe 2, the bottle body 3 is connected to the discharge pipe 2 through a material guide unit, and the material guide unit comprises: a circular plate 4, the circular plate 4 is fixedly connected to the bottom end of the discharge pipe 2, a one-way valve 5 is fixedly connected to the inside of the circular plate 4, the bottom end of the one-way valve 5 is fixedly connected to a first quick-plug connector 6, the bottom end of the first quick-plug connector 6 is connected to a vertical pipe 7, the vertical pipe 7 is connected to the first valve 8 and the micro-online flowmeter 9 installed in sequence from top to bottom, two sleeve plates 10 are provided in sequence from top to bottom on the upper part of the interior of the bottle body 3, the inner wall of the sleeve plate 10 is fixedly connected to the vertical pipe 7, the outer wall of the two sleeve plates 10 is fixedly connected to a cavity ring 11, and the outer wall of the cavity ring 11 is tightly pressed against the bottle body 3.

[0028] In the specific implementation process, it is worth noting that the online sampling valve body 1 is a common sampling device, which can be installed in the wastewater discharge pipeline. When needed, the valve can be opened to extract wastewater samples from the pipeline. Since it can be opened and taken at any time, intermittent sampling can be performed, that is, sampling is performed at regular intervals. The model of the online sampling valve body 1 is not specifically limited, and it can be used as required. The specific model needs to be determined according to the installation pipeline. The top of the discharge pipe 2 is connected to the discharge port of the online sampling valve body 1. The bottle body 3 is for chemical wastewater sampling. The one-way valve is mainly composed of a valve body, a valve core and a spring. Its working principle is to make the fluid forward and reverse. The one-way valve 5 allows wastewater to pass from top to bottom. The interior of the first quick-connect connector 6 is connected to the vertical pipe 7 and the outlet of the one-way valve 5. The quick-connect connector is a connector that can quickly connect or disconnect the pipeline without using tools. It is also called a quick connector, quick-connect connector, etc. It is a mature and well-known structural part. It uses the elasticity of elastic elements (such as sealing rings, retaining rings, etc.) and a special structural design to make the pipe or hose easy to insert. The insertion and removal connector greatly improves the efficiency of pipe connection and removal. The standpipe 7 is a PU hose that has a certain degree of tolerance to a variety of chemical substances. For some common chemical wastewater components, such as weak acids (such as acetic acid and citric acid), weak bases (such as sodium carbonate solution), and some organic solvents (such as alcohols and ketones), the PU hose can remain relatively stable under low concentration and suitable temperature conditions, without undergoing obvious chemical reactions or corrosion. The micro-online flowmeter 9 is an instrument for real-time and continuous measurement of fluid (liquid or gas) flow. It has the characteristics of a compact size. "Online" means that it can be installed in a fluid transport pipeline to continuously monitor the flow rate of the flowing fluid without removing the fluid from the pipeline for measurement, thereby timely and accurately reflecting the actual flow rate of the fluid. The model of the micro-online flowmeter 9 is not limited and can meet the needs of use. It can monitor the amount of wastewater passing through and facilitate the injection of an appropriate amount of wastewater into the bottle body 3. The interior of the cavity ring 11 is interconnected with the space between the two sleeve plates 10. The cavity ring 11 is made of fluororubber and has a certain degree of flexibility.

[0029] Furthermore, a gravity block 28 is fixedly sleeved on the bottom end of the outer wall of the vertical pipe 7 .

[0030] During the specific implementation, it is worth noting that the gravity block 28 is made of stainless steel, so that the bottom end of the vertical tube 7 is located at the inner bottom end of the bottle body 3.

[0031] Furthermore, a gas injection unit is provided on the upper side of the sleeve 10, and the gas injection unit includes: a first cannula 12, the first cannula 12 is fixedly connected to one side of the upper surface of the sleeve 10, the first cannula 12 is connected to the interior of the cavity ring 11, the top end of the first cannula 12 is fixedly connected to a first hose 13, a second valve 14 is installed on the pipeline of the first hose 13, the top end of the first hose 13 is connected to a second quick-plug connector 15, the second quick-plug connector 15 is fixedly connected to the circular plate 4, a first solenoid valve 16 is installed on one side of the upper surface of the circular plate 4, a first vertical hole 18 is provided on one side of the lower surface of the circular plate 4, and the gas injection port of the first solenoid valve 16 is fixedly connected to the gas injection pipe 17.

[0032] During the specific implementation process, it is worth noting that the first hose 13 and the vertical pipe 7 are made of the same material, the first solenoid valve 16 and the second solenoid valve 23 are both normally closed solenoid valves, their power lines are connected to the external power supply device, and can provide the required electrical energy for their operation, the air injection pipe 17 is connected to the external high-pressure air supply device, and the air injection pipe 17 is connected to the feed port of the first solenoid valve 16 through the first vertical hole 18.

[0033] Furthermore, an exhaust unit is provided on the other side above the sleeve 10, and the exhaust unit includes: a second insert pipe 19, the second insert pipe 19 is fixedly connected to the sleeve 10, the top end of the second insert pipe 19 is fixedly connected to a second hose 20, a third valve 21 is installed on the pipeline of the second hose 20, the top end of the second hose 20 is connected to a third quick-plug connector 22, the third quick-plug connector 22 is fixedly connected to the circular plate 4, a second solenoid valve 23 is installed on the other side of the upper surface of the circular plate 4, a second vertical hole 25 is opened on the other side of the lower surface of the circular plate 4, and the exhaust port of the second solenoid valve 23 is fixedly connected to an exhaust pipe 24.

[0034] During the specific implementation process, it is worth noting that the second insertion tube 19 is interconnected with the internal space of the bottle body 3, the second hose 20 is made of the same material as the vertical pipe 7, the exhaust pipe 24 is connected to the air inlet pipe of the external waste treatment equipment, and the waste discharged by the exhaust pipe 24 will not be discharged directly. The exhaust pipe 24 is interconnected with the discharge port of the second solenoid valve 23 through the second vertical hole 25.

[0035] Furthermore, the discharge pipe 2 is a double-section structure, with a flexible tube 29 being installed between the double-section discharge pipes 2 , and pipe clamps 30 being installed at both ends of the outer wall of the flexible tube 29 .

[0036] During the specific implementation, it is worth noting that the soft tube 29 is made of fluororubber, and the pipe clamp 30 is in a tightened state, so that the soft tube 29 can be fastened to the outer wall of the discharge pipe 2.

[0037] Furthermore, a convex cylinder 31 is fixed to the upper surface of the sleeve plate 10 .

[0038] During the specific implementation, it is worth noting that the arrangement of the convex cylinder 31 can facilitate the operator to apply force to the sleeve plate 10 .

[0039] Furthermore, a transverse hole 26 is formed on one side of the outer wall of the circular plate 4 . The transverse hole 26 is connected to the interior of the first vertical hole 18 . A safety valve 27 is threadedly connected to one end of the inner wall of the transverse hole 26 .

[0040] During the specific implementation process, it is worth pointing out that the safety valve 27, also known as the pressure relief valve, is usually equipped with a spring and piston system (or valve core) inside. When the system pressure exceeds the preset value, the pressure will overcome the resistance of the spring and push the piston or valve core to move, thereby opening the valve and releasing excess pressure. When the first solenoid valve 16 is not closed in time due to operational error, the internal air pressure of the cavity ring 11 is greater than the set critical value of the safety valve 27. The safety valve 27 can discharge the internal air of the cavity ring 11 to the outside, thereby preventing the cavity ring 11 from being damaged due to the high internal air pressure, and facilitating long-term and safe use.

[0041] Working principle:

[0042] Use bottles to collect chemical wastewater samples:

[0043] First, install the online sampling valve body 1 on the pipeline through which chemical wastewater flows. When the bottle body 3 is needed to sample the chemical wastewater, the sampling operator takes the bottle body 3 to the bottom of the circular plate 4, inserts most of the vertical pipe 7 into the interior of the bottle body 3, and makes the cavity ring 11 on the outer wall of the sleeve 10 fully press against the upper inner wall of the bottle body 3. At this time, open the first valve 8 and the online sampling valve body 1 in sequence, and the water pressure inside the discharge pipe 2 begins to increase to be greater than the threshold of the one-way valve 5. The wastewater begins to pass through the one-way valve 5, the first quick connector 6, the first valve 8, and the micro online flow meter. 9 and the vertical pipe 7 are discharged into the interior of the bottle body 3. When the wastewater sample in the bottle body 3 is appropriate, the online sampling valve body 1 and the first valve 8 are closed in sequence, and then the top of the vertical pipe 7 is separated from the bottom end of the first quick-plug connector 6, the second valve 14 closes the first hose 13 and separates it from the second quick-plug connector 15, and the third valve 21 closes the second hose 20 and separates it from the third quick-plug connector 22. The bottle body 3 is removed to complete the wastewater sampling operation. During the overall operation, the pungent smell of the wastewater in the bottle body 3 will not spread to the sampling area, and the safety performance of the operators during sampling is improved.

[0044] The cavity ring is fully pressed against the upper part of the bottle body:

[0045] After the cavity ring 11 is located above the interior of the bottle body 3, the sampling operator opens the second valve 14, starts the first solenoid valve 16, and the air injection pipe 17 begins to inject air into the cavity ring 11 through the first hose 13 and the first cannula 12. The air pressure inside the cavity ring 11 increases and its volume increases accordingly, so as to ensure that the cavity ring 11 can be fully pressed against the inner wall of the bottle body 3.

[0046] Pressure relief during wastewater injection into the bottle:

[0047] During the injection of the wastewater sample into the bottle body 3, the operator opens the third valve 21 and the second solenoid valve 23 to discharge the air pressure increased by the injection of wastewater into the bottle body 3 to the external waste treatment equipment, thereby facilitating the smooth injection of an appropriate amount of wastewater into the bottle body 3.

[0048] Taking out samples from bottles in the laboratory:

[0049] The operator opens the second valve 14. At this time, the interior of the cavity ring 11 is connected to the outside world through the first insert tube 12 and the first hose 13. The air pressure inside the cavity ring 11 decreases and the volume decreases accordingly. In this way, the cavity ring 11 and the vertical pipe 7 and other structures can be taken out of the bottle body 3. Then the wastewater sample inside the bottle body 3 can be poured out for subsequent testing operations. Finally, the workpiece that has been in contact with chemical wastewater is cleaned for use next time.

[0050] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Chemical wastewater intermittent online safety sampling structure, including: An online sampling valve body (1) is characterized in that: a discharge pipe (2) is fixedly connected to the bottom end of the online sampling valve body (1), a bottle body (3) is provided below the discharge pipe (2), the bottle body (3) is connected to the discharge pipe (2) through a material guide unit, and the material guide unit comprises: a circular plate (4), the circular plate (4) is fixedly connected to the bottom end of the discharge pipe (2), a one-way valve (5) is fixedly connected inside the circular plate (4), and the bottom end of the one-way valve (5) is fixedly connected to a first quick-connect connector (6), the bottom end of the first quick-connect connector (6) is connected to a vertical pipe (7), and the vertical pipe (7) is connected to a first valve (8) and a miniature online flow meter (9) in sequence from top to bottom. Two sleeves (10) are provided on the upper part of the interior of the bottle body (3) in sequence from top to bottom, and the inner wall of the sleeve (10) is fixedly connected to the vertical pipe (7). The outer walls of the two sleeves (10) are fixedly connected to a cavity ring (11), and the outer wall of the cavity ring (11) is tightly abutted against the bottle body (3).

2. The chemical wastewater intermittent online safety sampling structure according to claim 1 is characterized by: A gravity block (28) is fixedly sleeved on the bottom end of the outer wall of the vertical pipe (7).

3. The chemical wastewater intermittent online safety sampling structure according to claim 1 is characterized by: An air injection unit is provided on the upper side of the sleeve (10), and the air injection unit comprises: a first cannula (12), the first cannula (12) is fixedly connected to one side of the upper surface of the sleeve (10), the first cannula (12) and the interior of the cavity ring (11) are communicated with each other, a first hose (13) is fixedly connected to the top end of the first cannula (12), a second valve (14) is installed on the pipeline of the first hose (13), a second quick-connector (15) is connected to the top end of the first hose (13), the second quick-connector (15) is fixedly connected to the circular plate (4), a first solenoid valve (16) is installed on one side of the upper surface of the circular plate (4), a first vertical hole (18) is provided on one side of the lower surface of the circular plate (4), and the air injection port of the first solenoid valve (16) is fixedly connected to the air injection pipe (17).

4. The chemical wastewater intermittent online safety sampling structure according to claim 1 is characterized by: An exhaust unit is provided on the other side above the sleeve (10), and the exhaust unit comprises: a second insert pipe (19), the second insert pipe (19) is fixedly connected to the sleeve (10), a second hose (20) is fixedly connected to the top end of the second insert pipe (19), a third valve (21) is installed on the pipeline of the second hose (20), a third quick connector (22) is connected to the top end of the second hose (20), the third quick connector (22) is fixedly connected to the circular plate (4), a second solenoid valve (23) is installed on the other side of the upper surface of the circular plate (4), a second vertical hole (25) is opened on the other side of the lower surface of the circular plate (4), and an exhaust port of the second solenoid valve (23) is fixedly connected to an exhaust pipe (24).

5. The chemical wastewater intermittent online safety sampling structure according to claim 1 is characterized in that: The discharge pipe (2) is a double-section structure with upper and lower sections, a soft tube (29) is sleeved between the double-section discharge pipe (2), and both ends of the outer wall of the soft tube (29) are sleeved with pipe clamps (30).

6. The intermittent online safe sampling structure for chemical wastewater according to claim 1 is characterized by: A convex cylinder (31) is fixedly connected to the upper surface of the sleeve plate (10).

7. The intermittent online safe sampling structure for chemical wastewater according to claim 1 is characterized by: A transverse hole (26) is provided on one side of the outer wall of the circular plate (4), the transverse hole (26) and the interior of the first vertical hole (18) are communicated with each other, and a safety valve (27) is threadedly connected to one end of the inner wall of the transverse hole (26).

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