Environmental protection sampling device and environmental protection sampling method

Abstract

The present invention belongs to the technical field of on-site sampling of gas and liquid materials, and specifically relates to an environmentally friendly sampling device and an environmentally friendly sampling method, the device includes a main material pipeline and a sampling bypass connected to the main material pipeline, the sampling bypass includes an automatic sampling device, a timing control device and a liquid discharge device, the automatic sampling device includes a sampling pipeline, a sampling root valve 1, a solenoid valve and a sampling root valve 2, the head and tail ends of the sampling pipeline are connected and fixed with the main material pipeline, the solenoid valve is arranged on the sampling pipeline, the sampling root valve 1 and the sampling root valve 2 are respectively arranged on the sampling pipelines on the front and rear sides of the solenoid valve; the timing control device includes a PLC programmable controller, the PLC programmable controller is electrically connected to the solenoid valve; the upper end of the liquid discharge device is connected to the sampling port of the solenoid valve, and the lower end of the liquid discharge device is connected to the sampling bottle. The present invention realizes the automation, zero emission and quantification of sampling.

Description

Technical Field

[0001] The invention belongs to the technical field of on-site sampling of gas and liquid materials, and in particular relates to an environmentally friendly sampling device and an environmentally friendly sampling method. Background Art

[0002] The traditional analytical sampling method is that a person takes a sampling bottle to the analytical sampling point at the device site, wearing appropriate protective equipment. Before formal sampling, the sampling valve is generally opened to discharge to the air, and the dead liquid in the short tube before and after the valve is discharged to ensure that the sample is a fresh sample of the process medium. This can ensure the timeliness and accuracy of the analysis results and provide detailed data for process operations. In addition, when sampling, since the amount of sampling is observed by the naked eye, the valve opening is controlled by hand to take a certain amount of fresh samples. This method may obtain more or less samples, which will cause secondary sampling or excessive sampling and then discharge, which will also cause material waste and environmental pollution. If it is not well controlled, the sample may splash out due to excessive valve opening, endangering the safety of personnel.

[0003] like Figure 1 The figure shows the structure of a conventional sampling device. One end of a sampling pipeline 4 is connected to a process pipeline 1. A root valve 2 and a manual sampling valve 3 are provided on the sampling pipeline 4. The other end of the sampling pipeline 4 is connected to a sampling bottle 5. According to the provisions of analytical sampling, the root valve 2 and the manual sampling valve 3 are opened first during sampling, and the dead liquid and residual liquid in the sampling pipeline 4 are discharged into the air until fresh materials are discharged. Only in this way can the influence of the dead liquid and residual liquid on the analysis results be eliminated, and the sample taken is guaranteed to be a fresh sample. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention proposes an environmentally friendly sampling device and an environmentally friendly sampling method, which realize automation, zero emission and quantification of sampling.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The invention provides an environmentally friendly sampling device, comprising a main material pipeline and a sampling bypass connected to the main material pipeline, the sampling bypass comprising an automatic sampling device, a timing control device and a liquid discharge device, the automatic sampling device comprising a sampling pipeline, a sampling root valve 1, a solenoid valve and a sampling root valve 2, the head and tail ends of the sampling pipeline are connected and fixed with the main material pipeline, the solenoid valve is arranged on the sampling pipeline, the sampling root valve 1 and the sampling root valve 2 are respectively arranged on the sampling pipeline at the front and rear sides of the solenoid valve; the timing control device comprises a PLC programmable controller, and the PLC programmable controller is electrically connected to the solenoid valve; the upper end of the liquid discharge device is connected to the sampling port of the solenoid valve, and the lower end of the liquid discharge device is connected to a sampling bottle.

[0007] Furthermore, the main material pipeline includes a high-pressure side process pipeline and a low-pressure side process pipeline, and a throttling pressure reducing valve is provided at the connection between the high-pressure side process pipeline and the low-pressure side process pipeline.

[0008] Furthermore, the timing control device also includes a touch screen, a sampling button and a power supply. The touch screen and the sampling button are electrically connected to the PLC programmable controller respectively, and the power supply supplies power to the touch screen and the PLC programmable controller.

[0009] Furthermore, the power supply adopts 220VAC or 24VDC.

[0010] Furthermore, the solenoid valve comprises an input port P of the solenoid valve, an output port A of the solenoid valve, a sampling port B of the solenoid valve and a coil. The input port P of the solenoid valve and the output port A of the solenoid valve are both connected to the sampling pipeline, and the coil is electrically connected to the PLC programmable controller.

[0011] Furthermore, the liquid discharge device includes a sampling tube, which is connected and fixed to the sampling port B of the solenoid valve. A sealing cover is provided at the upper end of the sampling tube, an injection port is opened on the sealing cover, two residual liquid prevention ports are opened on the sampling tube near the injection port, and a splash-proof stainless steel wire ball is placed at the lower end of the interior of the sampling tube.

[0012] Furthermore, a three-way valve is provided on the sampling pipeline between the sampling root valve 1 and the input port P of the solenoid valve, and the three-way valve includes an inlet of the three-way valve, an outlet of the three-way valve and a sampling port of the three-way valve, and the inlet and outlet of the three-way valve are both connected to the sampling pipeline, and the sampling port of the three-way valve is connected and fixed to the sampling tube of the discharge device, and the lower end of the sampling tube is connected to the sampling bottle.

[0013] The present invention also provides an environmentally friendly sampling method, which comprises:

[0014] The material in the process pipeline on the high-pressure side flows through the sampling pipeline to the sampling root valve 1, and then flows to the input port P of the solenoid valve. When no sampling is done, the solenoid valve is not energized, the input port P of the solenoid valve is connected to the output port A of the solenoid valve, and the input port P of the solenoid valve is not connected to the sampling port B of the solenoid valve. In this way, the material flows out from the output port A of the solenoid valve, and continuously flows to the process pipeline on the low-pressure side through the sampling root valve 2;

[0015] When analysis sampling is required, press the sampling button or the sampling button on the touch screen, and the PLC programmable controller controls the coil of the solenoid valve to be energized. At this time, the input port P of the solenoid valve is connected to the sampling port B of the solenoid valve, and the input port P of the solenoid valve is not connected to the output port A of the solenoid valve. The fresh sample in the sampling pipeline flows out from the sampling port B of the solenoid valve and is collected into the sampling bottle through the drainage device. When the sampling time is up, the PLC programmable controller controls the coil of the solenoid valve to lose power, and the solenoid valve returns to its original state, thus completing a sampling process.

[0016] Furthermore, a three-way valve is added to the sampling pipeline between the sampling root valve 1 and the input port P of the solenoid valve, and the switching between automatic sampling and manual sampling is realized through the three-way valve; when the automatic sampling suddenly fails, the three-way valve is operated to complete the manual sampling process.

[0017] Further, the manual sampling process includes:

[0018] Manually rotate the three-way valve to connect the inlet of the three-way valve with the sampling port of the three-way valve, and block the inlet of the three-way valve from the outlet. The fresh sample enters the sampling bottle through the discharge device. When the sampling volume meets the requirements, manually rotate the three-way valve back to its original position. At this time, the inlet of the three-way valve and the outlet of the three-way valve are connected, and the inlet of the three-way valve and the sampling port of the three-way valve are blocked.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. The high-pressure side and the low-pressure side of the environmentally friendly sampling device of the present invention maintain a certain pressure difference, and the material on the high-pressure side continuously flows into the low-pressure side, ensuring the continuous flow and replacement of materials in the sampling bypass and the main material pipeline, which solves the problem of discharging materials into the air before traditional sampling. A solenoid valve is arranged on the sampling pipeline. When the solenoid valve is not energized, the solenoid valve acts as a circulation pipeline, and the material continuously passes through the solenoid valve to ensure that the sample taken at any time is fresh. When the solenoid valve is energized, the solenoid valve changes the material flow direction for automatic sampling. The solenoid valve can ensure timely automatic sampling under the condition of continuous flow of materials.

[0021] 2. The timing control device of the present invention realizes quantitative sampling by controlling the sampling time, thus solving the problem that the traditional sampling method cannot be quantified. Moreover, the timing control device can realize on-demand sampling by adjusting the sampling time according to the actual needs of on-site sampling, thus avoiding material waste and environmental pollution.

[0022] 3. The liquid discharge device of the present invention ensures that all the materials discharged by the solenoid valve enter the sampling bottle, thus solving the problem of the need to replace the residual materials in the sampling tube for the next sampling.

[0023] 4. When sampling, the present invention only needs to lightly press the sampling button to complete a sampling process, realizing one-key sampling, which is simple, convenient and fast, reduces safety risks, improves work efficiency and reduces workload.

[0024] 5. The present invention does not require the replacement of discharged materials before sampling, the samples taken are quantitatively unified, there is no need to recover discharged materials, the sample analysis cost is reduced, the problem of on-site material pollution of the environment is solved, and dangerous materials are prevented from endangering human health. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the structure of a conventional sampling device;

[0027] Figure 2 1 is a schematic structural diagram of an environmental protection sampling device according to a first embodiment of the present invention;

[0028] Figure 3 is a schematic structural diagram of a solenoid valve according to a first embodiment of the present invention;

[0029] Figure 4 is a schematic structural diagram of a liquid discharge device according to a first embodiment of the present invention;

[0030] Figure 5 is a schematic structural diagram of a timing control device according to a first embodiment of the present invention;

[0031] Figure 6 is a schematic structural diagram of an environmental protection sampling device according to a second embodiment of the present invention;

[0032] Figure 7 It is a structural schematic diagram of a three-way valve according to the second embodiment of the present invention.

[0033] The meanings of the numbers in the figure are:

[0034] 1. Process pipeline, 2. Root valve, 3. Manual sampling valve, 4. Sampling pipeline, 5. Sampling bottle, 6. Process pipeline on the high-pressure side, 7. Process pipeline on the low-pressure side, 8. Throttling and pressure reducing valve, 9. Sampling root valve 1, 10. Sampling root valve 2, 11. Solenoid valve, 12. Coil, 13. Drain device, 14. Timing control device, 15. Input port P of the solenoid valve, 16. Output port A of the solenoid valve, 17. Sampling port B of the solenoid valve, 18. Injection port, 19. Anti-residual liquid port, 20. Sampling tube, 21. Anti-splash stainless steel wool, 22. Power supply, 23. Sampling button, 24. Touch screen, 25. PLC programmable controller, 26. Three-way valve, 27. Inlet of the three-way valve, 28. Outlet of the three-way valve, 29. Sampling port of the three-way valve. DETAILED DESCRIPTION

[0035] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0036] Embodiment 1

[0037] like Figure 2 As shown, the environmental sampling device of this embodiment includes a main material pipeline and a sampling bypass connected to the main material pipeline, the sampling bypass includes an automatic sampling device, a timing control device 14 and a liquid discharge device 13; the automatic sampling device includes a sampling pipeline 4, a sampling root valve 1 9, a solenoid valve 11 and a sampling root valve 2 10, the head and tail ends of the sampling pipeline 4 are connected and fixed to the main material pipeline, the solenoid valve 11 is arranged on the sampling pipeline 4, the sampling root valve 1 9 and the sampling root valve 2 10 are respectively arranged on the solenoid valve 11 and the sampling root valve 10. On the sampling pipeline 4 on the front and rear sides of the magnetic valve 11; the timing control device 14 includes a PLC programmable controller 25, which is electrically connected to the electromagnetic valve 11, and the PLC programmable controller 25 can accurately control the time according to the sampling amount; the upper end of the discharge device 13 is connected to the sampling port of the electromagnetic valve 11, and the lower end of the discharge device 13 is connected to the sampling bottle 5, ensuring that all the materials discharged from the electromagnetic valve 11 enter the sampling bottle 5, solving the problem of replacing the residual materials in the sampling tube for the next sampling. Preferably, the sampling pipeline 4 is a 304ss stainless steel pipe with a diameter of 6mm, which is corrosion-resistant.

[0038] The sampling root valve 1 9 and the sampling root valve 2 10 of the automatic sampling device are convenient for inspection and maintenance. Under normal working conditions, the two valves are in an open state to facilitate the continuous flow of materials. When inspection and maintenance are required, the two valves are closed to cut off the flow of materials, which is convenient for the inspection and maintenance of the automatic sampling device. Preferably, the sampling root valve 1 9 and the sampling root valve 2 10 are stainless steel ball valves to ensure no leakage when closed.

[0039] The main material pipeline includes a high-pressure side process pipeline 6 and a low-pressure side process pipeline 7 , and a throttling pressure reducing valve 8 is provided at the connection between the high-pressure side process pipeline 6 and the low-pressure side process pipeline 7 .

[0040] like Figure 5 As shown, the timing control device 14 also includes a touch screen 24, a sampling button 23 and a power supply 22. The touch screen 24 and the sampling button 23 are electrically connected to the PLC programmable controller 25 respectively. The power supply 22 supplies power to the touch screen 24 and the PLC programmable controller 25. The power supply 22 adopts 220VAC or 24VDC. The timing control device 14 modifies the sampling time according to the actual needs of on-site sampling, realizes the precise timing of sampling and the quantification of sampling, ensures that the sampling amount meets the requirements, and solves the problem that the traditional sampling method cannot be quantified. In addition, the sampling button 23 realizes taking a sample once, and only needs to press the sampling button 23 once, realizing the function of one-key sampling, and the operation is simple and convenient.

[0041] like Figure 3 As shown, the solenoid valve 11 includes an input port P15 of the solenoid valve, an output port A16 of the solenoid valve, a sampling port B17 of the solenoid valve and a coil 12. The input port P15 of the solenoid valve and the output port A16 of the solenoid valve are both connected to the sampling pipeline 4. The coil 12 is electrically connected to the PLC programmable controller 25. The PLC programmable controller 25 has a voltage output, the coil 12 of the solenoid valve 11 is energized, and the valve core is displaced. The PLC programmable controller 25 has no voltage output, the coil 12 of the solenoid valve 11 loses power, and the valve core is reset. The solenoid valve 11 is used for continuous flow of materials and automatic sampling. When the solenoid valve 11 is not energized, the solenoid valve 11 plays the role of a circulation pipeline, and the material continuously passes through the solenoid valve 11, ensuring that the sample taken at any time is fresh, solving the problem of the traditional sampling method of ensuring that the sample taken is a fresh sample by discharge. When the solenoid valve 11 is energized, the solenoid valve 11 changes the material flow direction to realize the function of automatic sampling. The solenoid valve 11 is explosion-proof or non-explosion-proof according to the site requirements, and the voltage of the coil 12 of the solenoid valve 11 is 220VAC or 24VDC. The internal structure of the solenoid valve 11 should be particularly small to ensure that the amount of liquid remaining in the valve body is small enough to not affect the analysis result compared with the sampling amount.

[0042] like Figure 4 As shown, for the process medium that is not easy to volatilize, after the automatic sampling is completed, a small amount of sample will remain in the sampling tube 20. If it cannot be discharged in time, the residual liquid in the sampling tube 20 will be brought into the sample during the next sampling, so that the sample taken out is not all fresh, resulting in inaccurate analysis results. To this end, the liquid discharge device 13 of this example solves the problem of material residue after sampling, ensures that each sampling is a fresh sample, and provides qualified samples for the accuracy of the analysis results. The liquid discharge device 13 includes a sampling tube 20. Preferably, the sampling tube 20 is a stainless steel tube with a diameter of 8 mm. The sampling tube 20 is connected and fixed to the sampling port B17 of the solenoid valve through a stainless steel joint. A cover is provided at the upper end of the sampling tube 20, and a spray port 18 with a diameter of 1 mm is provided on the cover. Two residual liquid prevention ports 19 with a diameter of 2 mm are provided on the sampling tube 20 near the spray port 18. The lower end of the sampling tube 20 is a contracted structure. To prevent splashing during sampling, a splash-proof stainless steel wire ball 21 is placed at the lower end of the sampling tube 20. During automatic sampling, the pressure medium is ejected from the injection port 18 and collected into the sampling bottle 5 through the sampling tube 20. When the sampling is finished, since the two residual liquid prevention ports 19 are provided on the upper part of the sampling tube 20, the residual liquid prevention ports 19 are directly connected to the atmosphere, thereby ensuring that the residual liquid in the sampling tube 20 flows into the sampling bottle 5 under the action of gravity. The residual liquid prevention ports 19 are provided here to ensure that all the liquid discharged by the solenoid valve 11 can enter the sampling bottle 5, and no residual liquid is left in the sampling tube 20, thereby realizing zero-emission and zero-pollution environmentally friendly sampling.

[0043] This embodiment also provides an environmentally friendly sampling method, which includes:

[0044] Under normal circumstances, the process medium material in the high-pressure side process pipeline 6 passes through the throttling pressure reducing valve 8, and the pressure of the process medium material is reduced to a certain extent before entering the low-pressure side process pipeline 7. In this way, a certain pressure difference is formed between the high-pressure side process pipeline 6 and the low-pressure side process pipeline 7, creating conditions for the continuous flow of materials. The material in the high-pressure side process pipeline 6 flows to the sampling root valve 1 9 through the sampling pipeline 4, and then flows to the input port P15 of the solenoid valve. When sampling is not done, the solenoid valve 11 is not energized. At this time, the input port P15 of the solenoid valve is connected to the output port A16 of the solenoid valve, and the input port P15 of the solenoid valve is not connected to the sampling port B17 of the solenoid valve. In this way, the material flows out from the output port A16 of the solenoid valve, and continuously flows to the low-pressure side process pipeline 7 through the sampling root valve 2 10, so that fresh process medium can be ensured in each link.

[0045] When it is necessary to perform analysis sampling, just press the sampling button 23 or the sampling button on the touch screen 24 to complete a quantitative sampling. The PLC programmable controller 25 outputs voltage, and the coil 12 of the solenoid valve 11 is energized. At this time, the input port P15 of the solenoid valve is connected to the sampling port B17 of the solenoid valve, and the input port P15 of the solenoid valve is not connected to the output port A16 of the solenoid valve. The fresh sample in the sampling pipeline 4 flows out from the sampling port B17 of the solenoid valve and is collected into the sampling bottle 5 through the liquid discharge device 13. When the sampling time is up, the PLC programmable controller 25 has no voltage output, the coil 12 of the solenoid valve 11 loses power, and the solenoid valve 11 returns to its original state, thus completing a sampling process. Restore to the original state, that is, the input port P15 of the solenoid valve and the sampling port B17 of the solenoid valve are not connected, and the input port P15 of the solenoid valve and the output port A16 of the solenoid valve are connected. At this time, the process medium still flows from the high-pressure side process pipeline 6 to the low-pressure side process pipeline 7, ensuring that the entire sampling pipeline 4 is always filled with fresh medium, and fresh samples can be taken out at any time.

[0046] Embodiment 2

[0047] like Figure 6 As shown, the environmental sampling device of this embodiment is based on the device of the first embodiment, and a three-way valve 26 is provided on the sampling pipeline 4 between the sampling root valve 9 and the input port P15 of the solenoid valve. Figure 7 As shown, the three-way valve 26 includes an inlet 27 of the three-way valve, an outlet 28 of the three-way valve and a sampling port 29 of the three-way valve. The inlet 27 and the outlet 28 of the three-way valve are both connected to the sampling pipeline 4. The sampling port 29 of the three-way valve is connected and fixed to the sampling tube 20 of the discharge device 13. The lower end of the sampling tube 20 is connected to the sampling bottle 5.

[0048] This embodiment also provides an environmentally friendly sampling method, which includes:

[0049] Under normal circumstances, there is a certain pressure difference between the high-pressure side process pipeline 6 and the low-pressure side process pipeline 7, and this pressure difference is maintained within a suitable range, so that when no sampling is performed, the materials in the entire environmental sampling loop can flow continuously. The materials in the high-pressure side process pipeline 6 flow to the sampling root valve 1 9 through the sampling pipeline 4, and then flow to the inlet 27 of the three-way valve. In the automatic sampling state, the three-way valve 26 is manually rotated to the position where the inlet 27 of the three-way valve and the outlet 28 of the three-way valve are connected. At this time, the material flows out from the outlet 28 of the three-way valve and enters the input port P15 of the solenoid valve. When no sampling is performed, the solenoid valve 11 is not energized. At this time, the input port P15 of the solenoid valve is connected to the output port A16 of the solenoid valve, and the input port P15 of the solenoid valve is not connected to the sampling port B17 of the solenoid valve. In this way, the material flows out from the output port A16 of the solenoid valve, and continuously flows to the low-pressure side process pipeline 7 through the sampling root valve 2 10, so that each link can be guaranteed to be a fresh process medium.

[0050] When it is necessary to perform analytical sampling, one only needs to gently press the sampling button 23 or the sampling button on the touch screen 24 to complete a quantitative sampling. The PLC programmable controller 25 outputs a voltage, and the coil 12 of the solenoid valve 11 is energized. At this time, the input port P15 of the solenoid valve and the sampling port B17 of the solenoid valve are connected, and the input port P15 of the solenoid valve and the output port A16 of the solenoid valve are not connected. The fresh sample in the sampling pipeline 4 flows out from the sampling port B17 of the solenoid valve and is collected in the sampling bottle 5 through the discharge device 13. When the sampling time is up, the PLC programmable controller 25 has no voltage output, the coil 12 of the solenoid valve 11 loses power, and the solenoid valve 11 returns to its original state, thus completing a sampling process. Restore to the original state, that is, the input port P15 of the solenoid valve and the sampling port B17 of the solenoid valve are not connected, and the input port P15 of the solenoid valve and the output port A16 of the solenoid valve are connected. At this time, the process medium still flows from the high-pressure side process pipeline 6 to the low-pressure side process pipeline 7, ensuring that the entire sampling pipeline 4 is always filled with fresh medium, and fresh samples can be taken out at any time.

[0051] In the automatic sampling circuit, a three-way valve 26 is added to the sampling pipeline 4 between the sampling root valve 9 and the input port P15 of the solenoid valve. The three-way valve 26 can realize the switching function between automatic sampling and manual sampling. When the automatic sampling fails suddenly, the three-way valve 26 is operated to complete the manual sampling process. The manual sampling process is:

[0052] Manually rotate the three-way valve 26 to make the inlet 27 of the three-way valve communicate with the sampling port 29 of the three-way valve, and the inlet 27 of the three-way valve and the outlet 28 of the three-way valve are blocked. The fresh sample enters the sampling bottle 5 through the discharge device 13. When the sampling volume meets the requirements, manually rotate the three-way valve 26 to return to its original position. At this time, the inlet 27 of the three-way valve and the outlet 28 of the three-way valve are connected, and the inlet 27 of the three-way valve and the sampling port 29 of the three-way valve are blocked. The structure of the discharge device 13 for manual sampling is exactly the same as that of the discharge device 13 for automatic sampling, ensuring that no residual liquid is left after sampling, and realizing zero-emission and zero-pollution environmentally friendly sampling. In order to ensure that all-weather sampling is not affected in any way, a manual sampling function is added on the basis of automatic sampling, realizing the free switching of manual / automatic sampling, which is better than single automatic sampling.

[0053] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0054] Finally, it should be noted that the above is only a preferred embodiment of the present invention, which is only used to illustrate the technical solution of the present invention, and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. An environmental sampling device, comprising a main material pipeline, characterized in that: It also includes a sampling bypass connected to the main material pipeline, the sampling bypass includes an automatic sampling device, a timing control device and a liquid discharge device, the automatic sampling device includes a sampling pipeline, a sampling root valve 1, a solenoid valve and a sampling root valve 2, the head and tail ends of the sampling pipeline are connected and fixed with the main material pipeline, the solenoid valve is arranged on the sampling pipeline, and the sampling root valve 1 and the sampling root valve 2 are respectively arranged on the sampling pipelines on the front and rear sides of the solenoid valve; the timing control device includes a PLC programmable controller, and the PLC programmable controller is electrically connected to the solenoid valve; the upper end of the liquid discharge device is connected to the sampling port of the solenoid valve, and the lower end of the liquid discharge device is connected to the sampling bottle; the solenoid valve includes a sampling port B of the solenoid valve and an input port P of the solenoid valve; The liquid discharge device comprises a sampling tube, the sampling tube is connected and fixed to the sampling port B of the solenoid valve, a sealing cover is provided at the upper end of the sampling tube, an injection port is provided on the sealing cover, two residual liquid prevention ports are provided on the sampling tube near the injection port, and a splash-proof stainless steel wire ball is placed at the lower end of the interior of the sampling tube; A three-way valve is arranged on the sampling pipeline between the sampling root valve 1 and the input port P of the solenoid valve, and the three-way valve includes an inlet of the three-way valve, an outlet of the three-way valve and a sampling port of the three-way valve. The inlet and the outlet of the three-way valve are both connected to the sampling pipeline, and the sampling port of the three-way valve is connected and fixed to the sampling tube of the discharge device, and the lower end of the sampling tube is connected to the sampling bottle.

2. The environmental sampling device according to claim 1, characterized in that: The main material pipeline includes a high-pressure side process pipeline and a low-pressure side process pipeline, and a throttling pressure reducing valve is provided at the connection between the high-pressure side process pipeline and the low-pressure side process pipeline.

3. The environmental sampling device according to claim 1, characterized in that: The timing control device also includes a touch screen, a sampling button and a power supply. The touch screen and the sampling button are electrically connected to the PLC programmable controller respectively, and the power supply supplies power to the touch screen and the PLC programmable controller.

4. The environmental sampling device according to claim 3, characterized in that: The power supply adopts 220VAC or 24VDC.

5. The environmental sampling device according to claim 1, characterized in that: The solenoid valve further comprises an output port A of the solenoid valve and a coil. The input port P of the solenoid valve and the output port A of the solenoid valve are both connected to the sampling pipeline, and the coil is electrically connected to the PLC programmable controller.

6. An environmentally friendly sampling method, characterized in that: The method is implemented based on the environmental sampling device according to any one of claims 1 to 5, comprising: The material in the process pipeline on the high-pressure side flows through the sampling pipeline to the sampling root valve 1, and then flows to the input port P of the solenoid valve. When no sampling is done, the solenoid valve is not energized, the input port P of the solenoid valve is connected to the output port A of the solenoid valve, and the input port P of the solenoid valve is not connected to the sampling port B of the solenoid valve. In this way, the material flows out from the output port A of the solenoid valve, and continuously flows to the process pipeline on the low-pressure side through the sampling root valve 2; When it is necessary to perform analysis sampling, press the sampling button or the sampling button on the touch screen, and the PLC programmable controller controls the coil of the solenoid valve to be energized. At this time, the input port P of the solenoid valve is connected to the sampling port B of the solenoid valve, and the input port P of the solenoid valve is not connected to the output port A of the solenoid valve. The fresh sample in the sampling pipeline flows out from the sampling port B of the solenoid valve and is collected into the sampling bottle through the drainage device. When the sampling time is up, the PLC programmable controller controls the coil of the solenoid valve to lose power, and the solenoid valve returns to its original state, thus completing a sampling process; A three-way valve is added to the sampling pipeline between the sampling root valve 1 and the input port P of the solenoid valve, and the three-way valve is used to switch between automatic sampling and manual sampling; when the automatic sampling fails suddenly, the three-way valve is operated to complete the manual sampling process, and the manual sampling process includes: Manually rotate the three-way valve to connect the inlet of the three-way valve with the sampling port of the three-way valve, and block the inlet of the three-way valve from the outlet. The fresh sample enters the sampling bottle through the discharge device. When the sampling volume meets the requirements, manually rotate the three-way valve back to its original position. At this time, the inlet of the three-way valve and the outlet of the three-way valve are connected, and the inlet of the three-way valve and the sampling port of the three-way valve are blocked.

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