Anionic polyacrylamide hydrolysis degree automatic detection device and method

Abstract

The application belongs to the technical field of chemical detection equipment, and discloses an automatic detection device and method for the hydrolysis degree of anionic polyacrylamide, which comprises a magnetic stirrer, a feeder arranged above the magnetic stirrer and used for guiding sample solution and reagent solution into a detection container arranged on the magnetic stirrer, a guide shell and a guide valve core of the feeder, an installation cavity, a first feeding channel and a second feeding channel arranged in the guide shell, the first feeding channel and the second feeding channel being used for conveying sample solution and reagent solution respectively, the installation cavity separating the first feeding channel and the second feeding channel into a feeding part and a discharging part, and the guide valve core being rotatably arranged in the installation cavity and having a first through hole and a second through hole arranged through the guide valve core. Thus, cross contamination of different solutions in the conveying process and operation errors of manual pipetting can be effectively avoided.

Description

Technical Field

[0001] This invention belongs to the field of chemical detection equipment technology, specifically relating to an automatic detection device and method for the degree of hydrolysis of anionic polyacrylamide. Background Technology

[0002] Anionic polyacrylamide (APAM) is a polymeric flocculant widely used in water treatment, oil extraction, and papermaking. Its degree of hydrolysis is a crucial indicator of product performance. If the degree of hydrolysis is too low, the polyacrylamide's adsorption and bridging ability is weak, making it unable to effectively coagulate suspended particles in water, resulting in poor flocculation. Conversely, if the degree of hydrolysis is too high, the anionic nature of the polyacrylamide is enhanced, increasing the repulsive force with negatively charged suspended particles, which also reduces the flocculation effect.

[0003] Currently, the degree of hydrolysis is usually determined by potentiometric titration, which involves adding acid or alkali solution to the sample solution and measuring the change in pH value. However, the existing detection process relies heavily on manual operation, which makes the addition of samples and reagents cumbersome and inefficient, especially in the process of conducting a large number of comparative experiments. In addition, manual operation is prone to excessive errors, making it difficult to guarantee the accuracy and reliability of the detection results. Summary of the Invention

[0004] In view of this, in order to solve the problems mentioned in the background art, the purpose of the present invention is to provide an automatic detection device and method for the degree of hydrolysis of anionic polyacrylamide.

[0005] To achieve the above objectives, the present invention provides the following technical solution: An automatic detection device for the degree of hydrolysis of anionic polyacrylamide includes: Magnetic stirrer; A feeder, positioned above the magnetic stirrer, is used to deliver sample solution and reagent solution into a detection container placed on the magnetic stirrer; The feeder includes a guide housing and a guide valve core; the guide housing is provided with an installation cavity, a first feeding channel and a second feeding channel, the first feeding channel and the second feeding channel are used to transport sample solution and reagent solution respectively, and the installation cavity divides the first feeding channel and the second feeding channel into an inlet part and an outlet part; the guide valve core is rotatably installed in the installation cavity, and a first through hole and a second through hole are provided inside it; The guide valve core is configured to rotate via a motor installed outside the guide housing, so as to guide the first through hole to connect the feeding part and the discharging part of the first feeding channel, or to guide the second through hole to connect the feeding part and the discharging part of the second feeding channel.

[0006] Preferably, the first feeding channel is connected to the sample vial via a first pipeline and a peristaltic pump; the second feeding channel is connected to the reagent vial via a second pipeline and a titration pump.

[0007] Preferably, a third feeding channel is provided inside the material guide shell, and a third through hole is provided inside the material guide valve core; the material guide valve core is also configured to guide the third through hole to connect the feeding part and the discharging part of the third feeding channel, and the third through hole, the first through hole, and the second through hole are sequentially connected in one detection process.

[0008] Preferably, the third feeding channel is connected to the cleaning liquid bottle via a third pipeline and a peristaltic pump; the peristaltic pump includes a housing with a pump chamber inside and a rotor rotatably mounted at the center of the pump chamber, and two sets of rotatable extrusion rollers are embedded axially on the rotor, and portions of the first pipeline and the third pipeline are respectively inserted into the pump chamber between the housing wall and the two sets of extrusion rollers.

[0009] Preferably, the feeder further includes a liquid storage tank connecting the first feeding channel and the first pipeline, and the second pipeline and the third pipeline extend into the liquid storage tank.

[0010] Preferably, the feeder further includes a discharge pipe with an internal discharge channel, wherein a spiral guide vane is provided in the discharge channel, and the projection points of the third feeding channel, the first feeding channel and the second feeding channel falling on the spiral guide vane along the axial direction spiral downward.

[0011] Preferably, the discharge channel includes a tapered portion and a straight section connected to the smaller diameter end of the tapered portion. The spiral guide vanes are disposed inside the tapered portion and configured as a tapered spiral structure adapted to the tapered portion.

[0012] Preferably, the automatic detection device further includes a motion drive mechanism and a wastewater tank; the motion drive mechanism includes a lifting mechanism for guiding the feeder to move up and down and a moving mechanism for guiding the feeder to move back and forth between the magnetic stirrer and the wastewater tank.

[0013] Preferably, a fixing frame is provided on the outer periphery of the titration pump, and a fixing sleeve that can be screwed into the reagent bottle is fixed on the fixing frame.

[0014] To achieve the above objectives, the present invention also provides a detection method performed by the anionic polyacrylamide hydrolysis degree automatic detection device described in any one of the claims, comprising: Clean the feeder; Place the test container on the magnetic stirrer; The sample solution is fed into the detection container through the feeder, while the magnetic stirrer is activated to maintain magnetic stirring. Clean the feeder; The reagent solution is fed into the detection container via the feeder; The pH value of the solution in the test container is measured using a pH meter. The test is stopped when the endpoint pH is reached. When the sample solution is fed into the detection container through the feeder, the feed valve core is driven to rotate by a motor installed outside the feed housing, so as to guide the first through hole to connect the inlet and outlet parts of the first feeding channel; when the reagent solution is fed into the detection container through the feeder, the feed valve core is driven to rotate by a motor installed outside the feed housing, so as to guide the second through hole to connect the inlet and outlet parts of the second feeding channel.

[0015] Compared with the prior art, the present invention has the following advantages: (1) The present invention provides an automatic detection device for the degree of hydrolysis of anionic polyacrylamide, which is equipped with a feeder with a feed valve core and uses the rotation of the feed valve core to switch and conduct different feed channels, thereby further realizing the automatic switching and quantitative delivery of sample solution, reagent solution and cleaning solution. On the one hand, it effectively avoids cross-contamination of different solutions during the delivery process and the operation error of manual liquid transfer, and on the other hand, it significantly improves the detection efficiency and the accuracy of the detection results.

[0016] (2) In this invention, the feeder includes a discharge pipe structure with an internally integrated spiral guide vane, and restricts the dripping points of the cleaning liquid, sample solution and reagent solution on the spiral guide vane to spiral downward, thereby effectively ensuring that the cleaning liquid can completely remove the sample solution and reagent solution remaining on the spiral guide vane, and further avoid cross-contamination.

[0017] (3) In this invention, the same peristaltic pump is used to drive the sample solution and the cleaning solution to be transported together, and a storage tank for temporarily storing the sample solution is provided, which can further simplify the pump drive components of the overall device and reduce equipment costs.

[0018] (4) In this invention, a motion drive mechanism including a lifting mechanism and a moving mechanism is provided so that the feeder can automatically switch between the magnetic stirrer and the wastewater tank, thereby effectively realizing the automatic discharge of cleaning waste liquid. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the feeder in this invention; Figure 3 for Figure 2 Enlarged view of point A in the image; Figure 4 This is a cross-sectional view of the material guide shell in this invention; Figure 5 This is a schematic diagram of the material guide valve core in this invention; Figure 6 This is an exploded view of the peristaltic pump in this invention; Figure 7 This is an exploded view of the structure of the titration pump and reagent bottle in this invention. Figure 8 This is a schematic diagram of the assembly of the motion drive mechanism and the feeder in this invention; In the diagram: Magnetic stirrer-100; Feeder-200; Material guide shell-210; First feeding channel-211; Second feeding channel-212; Third feeding channel-213; Material guide valve core-220; First through hole-221; Second through hole-222; Third through hole-223; Liquid storage cylinder-230; Discharge pipe-240; Discharge channel-241; Spiral guide vane-242; Peristaltic pump-300; Sample bottle-301; Cleaning solution bottle-302; Rotor-303; Shell-304; Squeeze roller-305; Titration pump-400; Reagent bottle-401; Fixing frame-402; Fixing sleeve-403; Motion drive mechanism-500; Lifting mechanism-501; Moving mechanism-502; Wastewater tank-600. Detailed Implementation

[0020] To further understand the content of this invention, a detailed description of the invention is provided in conjunction with the accompanying drawings and embodiments. The structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art, and are not intended to limit the implementation conditions of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention. It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein.

[0021] like Figure 1As shown, the present invention provides an automatic detection device for the degree of hydrolysis of anionic polyacrylamide, comprising a magnetic stirrer 100, a feeder 200, a peristaltic pump 300, a titration pump 400, a motion drive mechanism 500, and a wastewater tank 600. Specifically, the magnetic stirrer 100 is used to hold the detection container; the motion drive mechanism 500 is mounted above the magnetic stirrer 100 via a bracket; the feeder 200 is mounted on the motion drive mechanism 500 to adjust its position above the detection container and the wastewater tank 600 under the drive of the motion drive mechanism 500; the peristaltic pump 300 connects a first pipeline and a third pipeline, with both ends of the first pipeline connected to the feeder 200 and the sample bottle 301, and both ends of the third pipeline connected to the feeder 200 and the cleaning solution bottle 302; the titration pump 400 is connected to the feeder 200 and the reagent bottle 401 via a second pipeline.

[0022] For example, detection methods include: The motion drive mechanism 500 is activated, causing the feeder 200 to move above the wastewater tank 600. The peristaltic pump 300 is started, and the sample solution (anionic polyacrylamide solution) and cleaning solution (such as deionized water) are pumped to the feeder 200 through the first pipeline and the third pipeline. The feeder 200 temporarily stores the sample solution, and the cleaning solution cleans the internal channels of the feeder 200. Start the motion drive mechanism 500 to drive the feeder 200 to move above the magnetic stirrer 100; Place the test container on the magnetic stirrer 100; Adjust the feeding mode of the feeder 200 so that the sample solution temporarily stored in the feeder 200 is delivered to the detection container, and at the same time start the magnetic stirrer 100 to maintain magnetic stirring. Start the titration pump 400 and pump the reagent solution (0.1 mol / L hydrochloric acid standard solution) into the feeder 200 through the second pipeline, so that the reagent solution is delivered into the detection container; The pH value of the solution in the test container is measured using a pH meter. The test is stopped when the endpoint pH is reached. Record the volume of reagent solution consumed and the pH of the solution, then calculate the degree of hydrolysis of the sample solution. Specifically: The automatic detection device of this invention was used to test a sample solution with a degree of hydrolysis of 10%. Ten groups of samples were tested, and the results were 10.13, 10.14, 10.08, 10.12, 10.15, 10.09, 10.11, 10.13, 10.12, and 10.11, respectively. The standard deviation of these ten groups of data was 0.02%, the relative standard deviation was 0.21%, and the relative mean deviation was 0.16%.

[0023] The automatic detection device of this invention was used to test a sample solution with a degree of hydrolysis of 15%. Ten groups of samples were tested, and the results were 15.05, 14.99, 15.00, 15.03, 15.03, 14.99, 15.06, 14.99, 15.03, and 15.05. The standard deviation of these ten groups of data was 0.03%, the relative standard deviation was 0.18%, and the relative mean deviation was 0.16%.

[0024] In one specific embodiment, reference continues to be made to... Figures 2-5 As shown, the feeder 200 includes a feed guide housing 210 and a feed guide valve core 220. The feed guide housing 210 is provided with an installation cavity, a first feed channel 211, a second feed channel 212, and a third feed channel 213. The first feed channel 211 is used to transport sample solution, the second feed channel 212 is used to transport reagent solution, and the third feed channel 213 is used to transport cleaning solution. The installation cavity divides the first feed channel 211, the second feed channel 212, and the third feed channel 213 into an inlet section and an outlet section. The feed guide valve core 220 is rotatably installed in the installation cavity, and a first through hole 221, a second through hole 222, and a third through hole 223 are provided inside it. Specifically, the feed valve core 220 is configured to rotate via a motor installed outside the feed housing 210, thereby guiding the first through hole 221 to connect the inlet and outlet portions of the first feed channel 211, or guiding the second through hole 222 to connect the inlet and outlet portions of the second feed channel 212, or guiding the third through hole 223 to connect the inlet and outlet portions of the third feed channel 213. It should be noted that in one detection process, the third through hole 223, the first through hole 221, and the second through hole 222 are sequentially connected, thereby achieving an automated detection process for cleaning (liquid storage), conveying the sample solution, and titrating the reagent solution.

[0025] In this embodiment, the shape of the guide valve core 220 is adapted to the mounting cavity, which can ensure a good sealing fit with the inner wall of the mounting cavity during rotation, thereby preventing liquid leakage; the first through hole 221, the second through hole 222 and the third through hole 223 penetrate the guide valve core 220 radially and are circumferentially inclined at different angles, so that the corresponding channels on both sides of the mounting cavity can be connected by rotating the guide valve core 220. When sample solution needs to be delivered, the motor outside the guide housing 210 drives the guide valve core 220 to rotate to a first preset angle, guiding the two ends of the first through hole 221 to align with the inlet and outlet ports of the first feeding channel 211, respectively. At this time, the first through hole 221 acts as a bridge, connecting the first feeding channel 211, which was originally separated by the mounting cavity. The sample solution flows sequentially through the inlet of the first feeding channel 211, the first through hole 221, and the outlet of the first feeding channel 211, thereby being delivered to the detection container. At the same time, the inlet and outlet ports of the second feeding channel 212 and the third feeding channel 213 remain disconnected, and their ports are sealed by the solid wall of the guide valve core 220 to ensure that reagent solution and cleaning solution do not mix. When reagent solution needs to be delivered, the motor drives the guide valve core 220 to rotate to a second preset angle, guiding the second through hole 222 to connect the inlet and outlet ports of the second feeding channel 212, realizing the flow of reagent solution. When cleaning fluid needs to be delivered, the motor drives the guide valve core 220 to rotate to the third preset angle, guiding the third through hole 223 to connect the feed part and the discharge part of the third feeding channel 213, thereby realizing the flow of cleaning fluid.

[0026] It should be understood that the peristaltic pump 300 allows the sample solution and cleaning solution to be pumped simultaneously. To ensure that the sample solution and cleaning solution do not interfere with each other during discharge, the feeder 200 also includes a storage tank 230 connecting the first feeding channel 211 and the first pipeline. The second and third pipelines extend into the storage tank 230. Thus, when the peristaltic pump 300 is started, the sample solution and cleaning solution are pumped into the feeder 200 through the first and third pipelines. The motor drives the guide valve core 220 to rotate to a third preset angle, guiding the third through-hole 223 to connect the inlet and outlet portions of the third feeding channel 213. The sample solution flows into the storage tank 230 for temporary storage, while the cleaning solution flows into the third feeding channel 213 to clean the internal channels of the feeder 200.

[0027] To further explain, the peristaltic pump 300 includes, for example: Figure 6The diagram shows a housing 304 with an internal pump chamber and a rotor 303 rotatably mounted at the center of the pump chamber. Two sets of rotatable squeezing rollers 305 are axially embedded in the rotor 303. The first and third pipelines are respectively routed through the pump chamber between the housing wall of the housing 304 and the two sets of squeezing rollers 305. During operation, the rotor 303 rotates, causing the two sets of squeezing rollers 305 to roll along the inner wall of the housing 304. For the first pipeline, one set of squeezing rollers 305 squeezes the pipeline during rolling, forcing the sample solution within the pipeline to flow. Similarly, for the third pipeline, the other set of squeezing rollers 305 squeezes the pipeline, thereby delivering the cleaning solution. It should be understood that, depending on the ratio of sample solution to cleaning solution used in actual experimental operations, first and third pipelines with different diameters can be installed.

[0028] To improve the cleaning effect of the feeder 200, the feeder 200 also includes, for example... Figure 3 The discharge pipe 240 shown has an internal discharge channel 241. A spiral guide vane 242 is installed inside the discharge channel 241. The projection points of the third feeding channel 213, the first feeding channel 211, and the second feeding channel 212, falling axially on the spiral guide vane 242, spiral downwards. Therefore: When cleaning the internal channel of the feeder 200, the cleaning fluid falls into the discharge channel 241 through the third feeding channel 213, and the liquid falls on the spiral guide vane 242 to form the upper point (the highest point in the axial direction). Then the cleaning fluid flows out along the surface of the spiral guide vane 242 to the straight section. When the sample solution is delivered, the sample solution falls into the discharge channel 241 through the first feeding channel 211, and the liquid falls on the spiral guide vane 242 to form an intermediate point (axial intermediate point). Then the sample solution flows out along the surface of the spiral guide vane 242 to the straight section. When the reagent solution is conveyed, the reagent solution falls into the discharge channel 241 through the second feeding channel 212, and the liquid falls on the spiral guide vane 242 to form a lower point (the lowest point in the axial direction). Then the reagent solution flows out along the surface of the spiral guide vane 242 to the straight section. The cleaning solution, sample solution, and reagent solution are all guided by the spiral guide vanes 242. Based on the optimized arrangement of the drop points of each solution, on the one hand, it is ensured that the cleaning solution can completely remove the sample solution and reagent solution in the discharge channel 241, thereby effectively avoiding cross-contamination of different solutions during transportation. On the other hand, it is ensured that the reagent solution can completely react with the sample solution, reducing titration detection errors.

[0029] It should be noted that the discharge channel 241 includes a tapered portion and a straight section connected to the smaller diameter end of the tapered portion. The spiral guide vane 242 is disposed within the tapered portion and configured as a tapered spiral structure adapted to the tapered portion. It should be understood that the diameter of the tapered portion gradually decreases from top to bottom, and the spiral guide surface of the adapted spiral guide vane 242 gradually narrows, thereby further ensuring the complete removal of the sample solution and reagent solution by the cleaning fluid.

[0030] In one specific embodiment, reference continues to be made to... Figure 7 As shown, a fixing frame 402 is provided on the outer periphery of the titration pump 400, and a fixing sleeve 403 that can be screwed into the reagent bottle 401 is fixed on the fixing frame 402, thereby facilitating the stable installation of the titration pump 400 and the reagent bottle 401 and further ensuring the accuracy of the titration test results.

[0031] In one specific embodiment, reference continues to be made to... Figure 8 As shown, the motion drive mechanism 500 includes a lifting mechanism 501 that guides the feeder 200 to move up and down, and a moving mechanism 502 that guides the feeder 200 to reciprocate between the magnetic stirrer 100 and the wastewater tank 600. Specifically, the lifting mechanism 501 and the moving mechanism 502 can be linear drive devices such as lead screw and nut pairs, cylinders, or linear motor modules. During the stage of conveying sample solution or reagent solution, the lifting mechanism 501 can drive the feeder 200 to descend, bringing the discharge pipe 240 closer to the detection container opening, thereby preventing solution splashing; while in the non-working state or cleaning stage, the lifting mechanism 501 drives the feeder 200 to rise, providing clearance for the handling of the detection container. The moving mechanism 502 is usually located at the bottom or side of the lifting mechanism 501 and is used to drive the feeder 200 to move horizontally, so that the feeder 200 can move precisely from above the magnetic stirrer 100 to above the wastewater tank 600, so as to realize the automatic fixed-point discharge of cleaning waste liquid during the cleaning stage and prevent waste liquid from contaminating the detection station.

[0032] In summary, the anionic polyacrylamide hydrolysis degree automatic detection device of the present invention effectively realizes fully automated operation from cleaning, sample injection, stirring to titration, avoiding the problems of low efficiency and large error in traditional manual operation, thereby significantly improving detection efficiency and accuracy of detection results.

[0033] In the description of this invention, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0034] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. An automatic detection device for the degree of hydrolysis of anionic polyacrylamide, characterized in that, include: Magnetic stirrer (100); A feeder (200) is disposed above the magnetic stirrer (100) for feeding sample solution and reagent solution into a detection container placed on the magnetic stirrer (100); The feeder (200) includes a guide housing (210) and a guide valve core (220); the guide housing (210) is provided with an installation cavity, a first feeding channel (211) and a second feeding channel (212), the first feeding channel (211) and the second feeding channel (212) are used to transport sample solution and reagent solution respectively, and the installation cavity divides the first feeding channel (211) and the second feeding channel (212) into an inlet part and an outlet part; the guide valve core (220) is rotatably installed in the installation cavity, and a first through hole (221) and a second through hole (222) are provided inside it. The guide valve core (220) is configured to rotate by a motor installed outside the guide housing (210) to guide the first through hole (221) to connect the feeding part and the discharging part of the first feeding channel (211), or to guide the second through hole (222) to connect the feeding part and the discharging part of the second feeding channel (212).

2. The automatic detection device for the degree of hydrolysis of anionic polyacrylamide according to claim 1, characterized in that: The first feeding channel (211) is connected to the sample bottle (301) via a first pipeline and a peristaltic pump (300); the second feeding channel (212) is connected to the reagent bottle (401) via a second pipeline and a titration pump (400).

3. The automatic detection device for the degree of hydrolysis of anionic polyacrylamide according to claim 2, characterized in that: The material guide shell (210) is also provided with a third feeding channel (213), and the material guide valve core (220) is also provided with a third through hole (223). The guide valve core (220) is also configured to guide the third through hole (223) to connect the feeding part and the discharging part of the third feeding channel (213), and the third through hole (223), the first through hole (221), and the second through hole (222) are sequentially connected in one detection process.

4. The automatic detection device for the degree of hydrolysis of anionic polyacrylamide according to claim 3, characterized in that: The third feeding channel (213) is connected to the cleaning fluid bottle (302) via the third pipeline and the peristaltic pump (300); the peristaltic pump (300) includes a housing (304) with a pump chamber inside and a rotor (303) rotatably mounted in the center of the pump chamber. Two sets of rotatable extrusion rollers (305) are embedded axially on the rotor (303). Parts of the first pipeline and the third pipeline pass through the pump chamber between the shell wall of the housing (304) and the two sets of extrusion rollers (305).

5. The automatic detection device for the degree of hydrolysis of anionic polyacrylamide according to claim 4, characterized in that: The feeder (200) also includes a liquid storage tank (230) connecting the first feeding channel (211) and the first pipeline, and the second pipeline and the third pipeline extend into the liquid storage tank (230).

6. The automatic detection device for the degree of hydrolysis of anionic polyacrylamide according to claim 3, characterized in that: The feeder (200) also includes a discharge pipe (240) with an internal discharge channel (241). The discharge channel (241) is provided with a spiral guide vane (242). The projection points of the third feeding channel (213), the first feeding channel (211) and the second feeding channel (212) fall on the spiral guide vane (242) spiral downward along the axial direction.

7. The automatic detection device for the degree of hydrolysis of anionic polyacrylamide according to claim 6, characterized in that: The discharge channel (241) includes a tapered portion and a straight section connected to the smaller diameter shaft end of the tapered portion. The spiral guide vane (242) is disposed inside the tapered portion and is configured as a tapered spiral structure adapted to the tapered portion.

8. The automatic detection device for the degree of hydrolysis of anionic polyacrylamide according to claim 3, characterized in that: It also includes a motion drive mechanism (500) and a wastewater tank (600); The motion drive mechanism (500) includes a lifting mechanism (501) that guides the feeder (200) to move up and down, and a moving mechanism (502) that guides the feeder (200) to move back and forth between the magnetic stirrer (100) and the wastewater tank (600).

9. The automatic detection device for the degree of hydrolysis of anionic polyacrylamide according to claim 2, characterized in that: A fixing frame (402) is provided on the outer periphery of the titration pump (400), and a fixing sleeve (403) that can be screwed into the reagent bottle (214) is fixed on the fixing frame (402).

10. A detection method performed by the automatic detection device for the degree of hydrolysis of anionic polyacrylamide according to any one of claims 1-9, characterized in that, include: Clean the feeder (200); Place the test container on the magnetic stirrer (100); The sample solution is fed into the detection container through the feeder (200), while the magnetic stirrer (100) is started to maintain magnetic stirring. The reagent solution is delivered into the detection container through the feeder (200); The pH value of the solution in the test container is measured using a pH meter. The test is stopped when the endpoint pH is reached. When the sample solution is fed into the detection container by the feeder (200), the feed valve core (220) is driven to rotate by a motor installed outside the feed housing (210) to guide the first through hole (221) to connect the feed portion and the discharge portion of the first feeding channel (211); when the reagent solution is fed into the detection container by the feeder (200), the feed valve core (220) is driven to rotate by a motor installed outside the feed housing (210) to guide the second through hole (222) to connect the feed portion and the discharge portion of the second feeding channel (212).

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