Automatic online sampling system and method for slurry and solution

Abstract

The invention relates to a slurry and solution automatic online sampling system and method. The device comprises a bypass pipeline connected between a slurry sample outflow port and a backflow port of a main pipeline for slurry production, the bypass pipeline is provided with a conveying pump, a cleaning valve set and a sampling valve set, and the sampling valve set is connected to a detector through a sample conveying pipeline; the conveying pump is used for conveying the slurry sample at the outlet to the reflux inlet; the sampling valve group is used for automatically and quantitatively sampling a slurry sample flowing through the bypass pipeline and sending the slurry sample to the detector for detection; and the cleaning valve group is used for flushing the bypass pipeline. According to the invention, the process of automatically sampling, sending to a detection instrument and detecting to obtain a result in the slurry production line can be realized, and the automatic cleaning process can be executed after the detection is completed, so that the human input is reduced and the detection efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of online sampling, in particular to an automatic online sampling system and method for slurry and solution. Background Art

[0002] During pulping production, it is necessary to sample and test semi-finished and finished pulp or solution. When the test results are abnormal, the production process parameters should be adjusted in time to ensure the quality of the finished pulp.

[0003] However, the existing technology has some problems: First, the current sampling method usually involves online quantitative sampling, which requires laboratory personnel to go to the production workshop and bring the samples back to the laboratory for testing. This process not only requires human resources, but may also cause time delays and reduced production efficiency; Secondly, when the experimenter operates the testing instrument in the laboratory, the concentration of the sample often exceeds the requirements set by the instrument. It is necessary to add a certain proportion of dilution solution or water to the sample. When the sample is diluted to a certain concentration, the slurry quality test can be completed. This step requires accurate operation and time investment, which increases the complexity and time-consumingness of the entire testing process. Finally, after the test, the experimenter needs to clean the experimental equipment to ensure that the next test can be carried out accurately. This cleaning process also requires additional time and human resources. Summary of the invention

[0004] To this end, the present invention provides an automatic online sampling system and method for slurry and solution, which can realize the process of automatically sampling the slurry production line, sending it to the detection instrument, and obtaining the test results. After the detection is completed, an automatic cleaning process can be performed to reduce manpower input and improve detection efficiency.

[0005] In order to solve the above technical problems, the present invention provides an automatic online sampling system for slurry and solution, comprising a bypass pipeline connected between a slurry sample outflow port and a reflux port of a main pipeline for slurry production, wherein a delivery pump, a cleaning valve group and a sampling valve group are respectively arranged on the bypass pipeline, and the sampling valve group is connected to a detector through a sample delivery pipeline; The delivery pump is used to deliver the slurry sample from the outflow port to the reflux port; The sampling valve group is used to automatically and quantitatively sample the slurry sample flowing through the bypass pipeline and send it to the detector for detection; The cleaning valve group is used for flushing the bypass pipeline.

[0006] In one embodiment of the present invention, the cleaning valve group includes a first valve connected to the outflow port and a second valve connected to the reflux port, the first valve is externally connected to a first clean liquid pipeline, and the second valve is externally connected to a first waste liquid pipeline.

[0007] In one embodiment of the present invention, the first valve and / or the second valve is a three-way valve.

[0008] In one embodiment of the present invention, the sampling valve group includes a first sampling valve, a second sampling valve and a third sampling valve, the first sampling valve is connected to the bypass pipeline, the third sampling valve is respectively connected to the first sampling valve and the sample delivery pipeline, the second sampling valve is respectively connected to the first sampling valve and the third sampling valve, and the second sampling valve is externally connected to a second clean liquid pipeline.

[0009] In one embodiment of the present invention, a fourth sampling valve may be further included, wherein the fourth sampling valve is connected between the third sampling valve and the first sampling valve and the second sampling valve, and the fourth sampling valve is externally connected to a second waste liquid pipeline.

[0010] In one embodiment of the present invention, the first sampling valve is a three-way valve, and the second sampling valve and / or the third sampling valve and / or the fourth sampling valve are ball valves.

[0011] In one embodiment of the present invention, the bypass pipeline is further connected to a third valve connected to the external atmosphere, and the third valve is located between the delivery pump and the first sampling valve.

[0012] In one embodiment of the present invention, the third valve is a ball valve.

[0013] In one embodiment of the present invention, the detector is connected to a third clean liquid pipeline and a third waste liquid pipeline.

[0014] The present invention also provides a method for automatic online sampling of slurry and solution, using the automatic online sampling system for slurry and solution, the method comprises: Turn on the delivery pump to allow the slurry in the main pipeline to flow from the outflow port through the bypass pipeline and out of the reflux port; Switch the first sampling valve, open the third sampling valve or open the third sampling valve and the fourth sampling valve at the same time, so that the slurry in the bypass pipeline flows into the first sampling valve, and at the same time, the original water or solution in the pipeline of the sampling valve assembly flows to the detector through the third sampling valve for discharge, or is discharged through the fourth sampling valve; According to the flow rate of the slurry in the bypass pipeline and the switching time of the first sampling valve and the opening and closing time of the third sampling valve, automatic quantitative sampling is realized. After the sampling is completed, the first sampling valve is reset, and the third sampling valve and the fourth sampling valve are closed; Open the second sampling valve and the third sampling valve, use the water or solution flowing into the second sampling valve to send the slurry in the pipeline of the sampling valve group to the detector for detection. After the sample is sent, close the second sampling valve and the third sampling valve, and the detector completes the sample detection; Open the second sampling valve and the third sampling valve, use the water or solution flowing into the second sampling valve to flush the sampling valve group pipeline and the sample delivery pipeline, and the waste liquid is discharged from the detector; or, first open the second sampling valve and the fourth sampling valve, flush the sampling valve group pipeline, then close the fourth sampling valve, open the third sampling valve, and then clean the sample delivery pipeline; After shutdown, switch the first valve to connect to the first clean liquid pipeline, switch the second valve to connect to the first waste liquid pipeline, and flush the bypass pipeline. After flushing, stop the delivery pump, open the third valve and connect to the external atmosphere, and discharge the remaining water or solution in the bypass pipeline through the second valve.

[0015] The above technical solution of the present invention has the following advantages compared with the prior art: The automatic online sampling system and method for slurry and solution described in the present invention connects a bypass sampling pipeline to the main pipeline for slurry production, so that the slurry in the production process can continue to flow through the bypass sampling pipeline, ensuring that fresh slurry samples are obtained; at the same time, it does not hinder the use of a push ball or other mechanical contact methods to clean the inner wall of the main pipeline.

[0016] When the push ball is used to clean the main pipeline, the cleaning valve group on the bypass pipeline can be switched to simultaneously use water or solution to flush the bypass sampling pipeline, thereby avoiding slurry residue in the bypass pipeline, thereby avoiding cross contamination of the sampling samples by the residual slurry.

[0017] The present invention can meet the sampling sample quantity required for each detection of the detection instrument by adjusting the switching time of the first sampling valve and the opening and closing time of the third sampling valve in the sampling valve group, thereby realizing accurate quantitative sampling.

[0018] The sampling valve group of the present invention is externally connected to a water or solution pipeline, and water or solution can be used to automatically send samples to a detection instrument, thereby realizing automatic sample delivery.

[0019] The present invention adopts a fully automatic detection instrument to realize automatic water or solvent addition to configure detection samples, automatic detection, automatic sample arrangement and automatic cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0021] Figure 1 It is a structural schematic diagram of the automatic online sampling system for slurry and solution of the present invention.

[0022] Description of the Figures in the Specification: 1. Main pipeline; A. Outlet; B. Return outlet; 2. Bypass pipeline; 3. Delivery pump; 4. Detector; 5. Sample delivery pipeline; F1, first valve; F2, second valve; F3, the third valve; 1a, first clean liquid pipeline; 1b, second clean liquid pipeline; 1c, third clean liquid pipeline; 2a, first waste liquid pipeline; 2b, second waste liquid pipeline; 2c, third waste liquid pipeline; 100. Sampling valve group; V1. first sampling valve; V2. second sampling valve; V3. third sampling valve; V4. fourth sampling valve. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0024] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention.

[0025] In the present invention, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present invention, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0026] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0027] Example 1 Reference Figure 1 As shown, an automatic online sampling system for slurry and solution of the present invention comprises a bypass pipe 2 connected between a slurry sample outflow port A and a reflux port B of a main pipe 1 for slurry production, wherein a delivery pump 3, a cleaning valve group and a sampling valve group 100 are respectively arranged on the bypass pipe 2, and the sampling valve group 100 is connected to a detector 4 via a sample delivery pipe 5; The delivery pump 3 is used to deliver the slurry sample from the outflow port A to the reflux port B; The sampling valve group 100 is used to automatically and quantitatively sample the slurry sample flowing through the bypass pipe 2 and send it to the detector 4 for detection; The cleaning valve group is used for flushing the bypass pipeline 2 .

[0028] By connecting a bypass sampling pipeline to the main pipeline 1 for slurry production, the slurry in the production process can continue to flow through the bypass sampling pipeline to ensure that fresh slurry samples are obtained; at the same time, it does not hinder the use of a push ball or other mechanical contact methods to clean the inner wall of the main pipeline 1.

[0029] Specifically, the cleaning valve group includes a first valve F1 connected to the outflow port A and a second valve F2 connected to the reflux port B. The first valve F1 is externally connected to a first clean liquid pipeline 1a, and the second valve F2 is externally connected to a first waste liquid pipeline 2a. Through the above arrangement, the first valve F1 is switched to connect to the first clean liquid pipeline 1a, and the second valve F2 is switched to connect to the first waste liquid pipeline 2a to flush the bypass pipeline. After the flushing is completed, the delivery pump 3 is stopped, the third valve F3 is opened and connected to the external atmosphere, and the residual water or solution in the bypass pipeline is discharged through the second valve F2. When the push ball is used to clean the main pipeline 1, by switching the cleaning valve group on the bypass pipeline, water or solution can be used to flush the bypass sampling pipeline simultaneously to avoid slurry residue in the bypass pipeline, thereby avoiding cross contamination of the sampled sample by the residual slurry.

[0030] Specifically, the first valve F1 and / or the second valve F2 is / are a pneumatic three-way valve or an electric three-way valve.

[0031] Specifically, the sampling valve group 100 includes a first sampling valve V1, a second sampling valve V2 and a third sampling valve V3. The first sampling valve V1 is connected to the bypass pipe 2, the third sampling valve V3 is respectively connected to the first sampling valve V1 and the sample delivery pipe 5, the second sampling valve V2 is respectively connected to the first sampling valve V1 and the third sampling valve V3, and the second sampling valve V2 is externally connected to a second clean liquid pipe 1b.

[0032] By adjusting the switching time of the first sampling valve V1 and the opening and closing time of the third sampling valve V3 in the sampling valve group 100, the sampling sample quantity required for each detection of the detector 4 can be met, and accurate quantitative sampling can be achieved. In addition, the second sampling valve V2 is externally connected to a water or solution pipeline. By opening the second sampling valve V2 and the third sampling valve V3, water or solution can be used to automatically send the sample in the pipeline of the sampling valve group 100 to the detector 4, thereby realizing automatic sample delivery.

[0033] Optionally, a fourth sampling valve V4 is further included, wherein the fourth sampling valve V4 is connected between the third sampling valve V3 and the first sampling valve V1 and the second sampling valve V2, and the fourth sampling valve V4 is externally connected to a second waste liquid pipeline 2b.

[0034] Through the above arrangement, the second sampling valve V2 and the third sampling valve V3 can be opened, and the water or solution flowing into the second sampling valve V2 can be used to flush the sampling valve group 100 pipeline and the sample delivery pipeline 5, and the waste liquid is discharged from the detector 4; alternatively, the second sampling valve V2 and the fourth sampling valve V4 can be opened first, the sampling valve group 100 pipeline can be flushed first, and then the fourth sampling valve V4 can be closed, the third sampling valve V3 can be opened, and then the sample delivery pipeline 5 can be cleaned. By controlling the opening or closing time of the second sampling valve V2, the cleaning time can be controlled.

[0035] Specifically, the first sampling valve V1 is a pneumatic three-way valve or an electric three-way valve, and the second sampling valve V2 and / or the third sampling valve V3 and / or the fourth sampling valve V4 are pneumatic ball valves or electric ball valves.

[0036] Specifically, the bypass pipeline 2 is also connected to a third valve F3 connected to the external atmosphere, and the third valve F3 is located between the delivery pump 3 and the first sampling valve V1.

[0037] Specifically, the third valve F3 is a pneumatic ball valve or an electric ball valve, and the delivery pump 3 is a diaphragm pump, a rotor pump or other types of delivery pumps.

[0038] Specifically, the detector 4 is connected to a third clean liquid pipeline 1c and a third waste liquid pipeline 2c. Through the above settings, the detector 4 adds water or solvent to the sample flowing from the sample delivery pipeline 5 according to the detection requirements, configures the sample to meet the detection requirements, and automatically completes the detection. After the detection is completed, the sample is automatically discharged into the third waste liquid pipeline 2c; after the sample is discharged into the third waste liquid pipeline 2c, water or solution is automatically added through the third clean liquid pipeline 1c to flush the inside of the detector 4, and the flushing waste liquid is discharged into the third waste liquid pipeline 2c. By adopting a fully automatic detection instrument 4, automatic configuration of detection samples, automatic detection, automatic sample discharge and automatic cleaning are realized.

[0039] Example 2 This embodiment provides a method for automatic online sampling of slurry and solution, using the automatic online sampling system for slurry and solution, the method includes: S1, turn on the delivery pump 3, so that the slurry in the main pipeline 1 flows from the outflow port A through the bypass pipeline 2 and out of the reflux port B; S2, switch the first sampling valve V1, open the third sampling valve V3 or open the third sampling valve V3 and the fourth sampling valve V4 at the same time, so that the slurry in the bypass pipeline flows into the first sampling valve V1, and at the same time, the original water or solution in the pipeline of the sampling valve group 100 flows through the third sampling valve V3 to the detector 4 for discharge, or is discharged through the fourth sampling valve V4; S3, according to the flow rate of the slurry in the bypass pipeline and the switching time of the first sampling valve V1 and the opening and closing time of the third sampling valve V3, automatic quantitative sampling is realized. After the sampling is completed, the first sampling valve V1 is reset, and the third sampling valve V3 and the fourth sampling valve V4 are closed; S4, open the second sampling valve V2 and the third sampling valve V3, use the water or solution flowing into the second sampling valve V2 to send the slurry in the pipeline of the sampling valve group 100 to the detector 4 for detection. After the sample delivery is completed, close the second sampling valve V2 and the third sampling valve V3, and the detector 4 completes the detection of the sample. The detector 4 adds water or solvent to the sample flowing through the sample delivery pipeline 5 according to the detection requirements, and automatically completes the detection after configuring the sample to meet the detection requirements. After the detection is completed, the sample is automatically discharged into the third waste liquid pipeline 2c; after the sample is discharged into the third waste liquid pipeline 2c, water or solution is automatically added through the third clean liquid pipeline 1c to flush the inside of the detector 4, and the flushing waste liquid is discharged into the third waste liquid pipeline 2c; S5, open the second sampling valve V2 and the third sampling valve V3, use the water or solution flowing into the second sampling valve V2 to flush the pipeline of the sampling valve group 100 and the sample delivery pipeline 5, and the waste liquid is discharged from the detector 4; or, first open the second sampling valve V2 and the fourth sampling valve V4, first flush the pipeline of the sampling valve group 100, then close the fourth sampling valve V4, open the third sampling valve V3, and then clean the sample delivery pipeline 5; S6. After shutdown, switch the first valve F1 to connect to the first clean liquid pipeline 1a, switch the second valve F2 to connect to the first waste liquid pipeline 2a, and flush the bypass pipeline. After the flushing is completed, stop the delivery pump 3, open the third valve F3 and connect to the external atmosphere, and discharge the residual water or solution in the bypass pipeline through the second valve F2.

[0040] Example 3 This embodiment uses an automatic online detection system for slurry and solution to detect the slurry particle size.

[0041] Process requirements: The material in the main pipeline 1 is lithium battery negative electrode slurry, and the detector 4 is an automatic particle size analyzer for detecting the slurry particle size.

[0042] The diameter of the bypass pipe is 8 mm, the first valve F1 and the second valve F2 are pneumatic three-way valves, the third valve F3 is a pneumatic ball valve, and the delivery pump 3 is a diaphragm pump.

[0043] In the sampling valve group 100, the first sampling valve V1 is a pneumatic three-way valve, the second sampling valve V2 and the third sampling valve V3 (the fourth sampling valve V4) are pneumatic ball valves, and the diameter of the internal connecting pipe of the sampling valve group 100 and the sample delivery pipe 5 connected to the detector 4 is 8 mm; the length of the sample delivery pipe 5 is 1 m; The first valve F1 , the second sampling valve V2 , and the particle size analyzer are all connected to the pure water pipe; the pure water is used to clean the pipe and transport the sample to the detector 4 .

[0044] The specific steps are as follows: S1. Automatic quantitative sampling Turn on the diaphragm pump and let the slurry in the main pipeline 1 flow in from the outflow port A and flow out from the reflux port B; at the same time, adjust the diaphragm pump so that the flow rate of the slurry in the bypass pipeline is 20ml / s; In the sampling valve group 100, the first sampling valve V1 is switched (0.5 seconds), and the third sampling valve V3 is opened (0.5 seconds). According to the bypass pipeline flow rate, it is calculated that the sample flowing into the pipeline of the sampling valve group 100 = 20ml / s*0.5s=10ml; S2, self-delivery and automatic testing The sample delivery pipe 5 connecting the sampling valve group 100 and the detector 4 is 1 meter long, 8 mm in diameter, and has a total volume = π*0.4²*100=50 ml; in the sampling valve group 100, the flow rate of the second sampling valve V2 connected to the external pure water pipe is 100 ml / s; Open the second sampling valve V2 and the third sampling valve V3 (2 seconds) to ensure that all the sample slurry in the sampling valve group 100 is brought into the particle size analyzer by water; a total of 200 ml of liquid flows into the sample pool 4 of the particle size detector, of which 10 ml is the sample to be tested; After the particle size analyzer sample pool receives the sample to be tested, the automatic dilution and water addition program is started (the instrument detects the sample concentration in real time, and stops adding water after the sample concentration is diluted to meet the test requirements. The test concentration requirement is <2%).

[0045] Dilute the sample to be tested. When the concentration is qualified, the particle size analyzer starts to perform cyclic particle size detection on the sample, and the test results are automatically recorded on the computer. After the test is completed, the test sample is discharged from the particle size analyzer through the waste liquid pipe.

[0046] S3. After the particle size analyzer finishes discharging the sample, it performs automatic cleaning.

[0047] Open the second sampling valve V2 and the third sampling valve V3 (10-20 seconds), and use the pure water flowing in from the second sampling valve V2 to flush the sampling valve group 100 pipeline and the sample delivery pipeline 5; the pure water finally flows into the particle size analyzer sample pool and is discharged through the particle size analyzer waste liquid pipe; Open the particle size analyzer sample pool and add pure water. At the same time, open the circulating detection pipeline and use the pure water to flush the sample pool and the circulating detection pipeline. After the flushing is completed, discharge it through the instrument waste pipe. S4. After the production line is shut down, clean the bypass pipeline of main pipeline 1.

[0048] After the production line stops production, the first valve F1 is switched to connect to the pure water pipe, and the second valve F2 is switched to connect to the waste liquid pipe, and the bypass pipe is flushed with pure water; After flushing is completed, the diaphragm pump is stopped, and the third valve F3 is opened to connect to the external atmosphere; the waste water remaining in the bypass pipe is completely discharged from the second valve F2 by its own weight.

[0049] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An automatic online sampling system for slurry and solution, characterized in that: The bypass pipe (2) is connected to a slurry production main pipe (1) between a slurry sample outflow port (A) and a reflux port (B), wherein a delivery pump (3), a cleaning valve group and a sampling valve group (100) are respectively arranged on the bypass pipe (2), and the sampling valve group (100) is connected to a detector (4) via a sample delivery pipe (5); The delivery pump (3) is used to deliver the slurry sample from the outflow port (A) to the reflux port (B); The sampling valve assembly (100) is used to automatically and quantitatively sample the slurry sample flowing through the bypass pipeline (2) and send the sample to the detector (4) for detection; The cleaning valve group is used for flushing the bypass pipeline (2).

2. The automatic online sampling system for slurry and solution according to claim 1, characterized in that: The cleaning valve group comprises a first valve (F1) connected to the outflow port (A) and a second valve (F2) connected to the reflux port (B); the first valve (F1) is externally connected to a first clean liquid pipeline (1a), and the second valve (F2) is externally connected to a first waste liquid pipeline (2a).

3. The automatic online sampling system for slurry and solution according to claim 2, characterized in that: The first valve (F1) and / or the second valve (F2) is / are a three-way valve.

4. The automatic online sampling system for slurry and solution according to claim 1 or 2, characterized in that: The sampling valve group (100) comprises a first sampling valve (V1), a second sampling valve (V2) and a third sampling valve (V3); the first sampling valve (V1) is connected to the bypass pipeline (2); the third sampling valve (V3) is respectively connected to the first sampling valve (V1) and the sample delivery pipeline (5); the second sampling valve (V2) is respectively connected to the first sampling valve (V1) and the third sampling valve (V3); and the second sampling valve (V2) is externally connected to a second clean liquid pipeline (1b).

5. The automatic online sampling system for slurry and solution according to claim 4, characterized in that: The device may further include a fourth sampling valve (V4), wherein the fourth sampling valve (V4) is connected between the third sampling valve (V3) and the first sampling valve (V1) and the second sampling valve (V2), and the fourth sampling valve (V4) is externally connected to a second waste liquid pipeline (2b).

6. The automatic online sampling system for slurry and solution according to claim 5, characterized in that: The first sampling valve (V1) is a three-way valve, and the second sampling valve (V2) and / or the third sampling valve (V3) and / or the fourth sampling valve (V4) are ball valves.

7. The automatic online sampling system for slurry and solution according to claim 1, characterized in that: The bypass pipeline (2) is also connected to a third valve (F3) connected to the external atmosphere, and the third valve (F3) is located between the delivery pump (3) and the first sampling valve (V1).

8. The automatic online sampling system for slurry and solution according to claim 7, characterized in that: The third valve (F3) is a ball valve.

9. The automatic online sampling system for slurry and solution according to claim 1, characterized in that: The detector (4) is connected to a third clean liquid pipeline (1c) and a third waste liquid pipeline (2c).

10. A method for automatic online sampling of slurries and solutions, characterized in that: Utilizing the slurry and solution automatic online sampling system according to any one of claims 1 to 9, the method comprises: Turn on the delivery pump (3) to allow the slurry in the main pipeline (1) to flow from the outflow port (A) through the bypass pipeline (2) and out from the return port (B); Switch the first sampling valve (V1), open the third sampling valve (V3) or open the third sampling valve (V3) and the fourth sampling valve (V4) at the same time, so that the slurry in the bypass pipeline flows into the first sampling valve (V1), and at the same time, the original water or solution in the pipeline of the sampling valve assembly (100) flows through the third sampling valve (V3) to the detector (4) for discharge, or is discharged through the fourth sampling valve (V4); Automatic quantitative sampling is achieved according to the flow rate of the slurry in the bypass pipeline and the switching time of the first sampling valve (V1) and the opening and closing time of the third sampling valve (V3). After the sampling is completed, the first sampling valve (V1) is reset and the third sampling valve (V3) and the fourth sampling valve (V4) are closed; The second sampling valve (V2) and the third sampling valve (V3) are opened, and the slurry in the pipeline of the sampling valve group (100) is sent to the detector (4) for detection by using the water or solution flowing into the second sampling valve (V2). After the sample is sent, the second sampling valve (V2) and the third sampling valve (V3) are closed, and the detector (4) completes the detection of the sample; The second sampling valve (V2) and the third sampling valve (V3) are opened, and the sampling valve group (100) pipeline and the sample delivery pipeline (5) are flushed with water or solution flowing into the second sampling valve (V2), and the waste liquid is discharged from the detector (4); or, the second sampling valve (V2) and the fourth sampling valve (V4) are opened first, and the sampling valve group (100) pipeline is flushed first, and then the fourth sampling valve (V4) is closed, and the third sampling valve (V3) is opened, and then the sample delivery pipeline (5) is cleaned; After shutdown, the first valve (F1) is switched to connect to the first clean liquid pipeline (1a), and the second valve (F2) is switched to connect to the first waste liquid pipeline (2a) to flush the bypass pipeline. After the flushing is completed, the delivery pump (3) is stopped, and the third valve (F3) is opened to connect to the external atmosphere, and the water or solution remaining in the bypass pipeline is discharged through the second valve (F2).

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