A reagent titration device and a reagent titration method

Abstract

The application discloses a reagent titration device and a reagent titration method, and belongs to the technical field of substance detection. The reagent titration device can automatically titrate reagents, reduce the manual burden, improve the operation standardization, quickly and objectively judge the sodium ion content, and improve the sodium ion detection accuracy. The reagent titration device comprises a dropper body and a piston rod, the end of the piston rod is provided with a piston head, the piston head is in sealing cooperation with the inner wall of the dropper body to form a sealed cavity in the dropper body. The piston rod moves along the axial direction of the dropper body to change the volume of the sealed cavity. The first opening and the second opening formed in the tube wall of the dropper body are both in communication with the sealed cavity. The first opening is connected with a first connecting pipeline for connecting a reagent container, and a first valve is arranged on the first connecting pipeline. The second opening is connected with a second connecting pipeline for adding reagents to the substance to be detected, and a second valve is arranged on the second connecting pipeline.

Description

Technical Field

[0001] This application belongs to the field of material detection technology, and in particular relates to a reagent titration device and a reagent titration method. Background Technology

[0002] In the Bayer process for producing aluminum hydroxide, the pan washing step is a crucial link between the decomposition and calcination processes. The aluminum hydroxide filter cake produced in the decomposition process typically adsorbs a large amount of high-caustic-ratio, complex sodium aluminate mother liquor. The pan washing step purifies the aluminum hydroxide filter cake, removing caustic soda, sodium aluminate, and other mother liquor components adhering to its surface and remaining within the micropores. If the aluminum hydroxide filter cake is not thoroughly washed in the pan washing step, these residues will enter the calcination process. During calcination, these residues will convert into sodium oxide, mixing into the aluminum hydroxide product and causing excessive sodium content. Therefore, before calcination, the sodium ion content of the aluminum hydroxide filter cake after the pan washing step must be tested. Only if the sodium ion content is within acceptable limits can it proceed to the calcination process.

[0003] Currently, in production sites, the phenolphthalein reagent colorimetric method is commonly used to quickly determine the washing effect of aluminum hydroxide filter cake and whether the sodium ion content exceeds the standard. The principle is: phenolphthalein reagent is added to the sample; if residual caustic alkali (OH-) is present... - The solution will turn pink. By manually observing and empirically judging the intensity of the pink color, it is possible to qualitatively assess whether the sodium ion content exceeds the control range.

[0004] However, current sodium ion detection methods heavily rely on manual operation, including manual sampling, manual reagent addition, and manual observation and judgment of color changes. This approach firstly increases the workload of operators; secondly, due to individual differences in subjective vision, ambient light interference, and inconsistent operational procedures, human judgment errors are easily introduced, leading to poor consistency and reduced reliability of test results, and making it impossible to accurately judge the "gray area" close to the critical value. Therefore, there is an urgent need for an automated detection method and device that can replace manual labor and achieve rapid, objective, and accurate judgment. Summary of the Invention

[0005] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a reagent titration device and a reagent titration method that can automatically titrate reagents, reduce manual workload while improving operational standardization, and can quickly and objectively determine the sodium ion content, thereby improving the accuracy of sodium ion detection.

[0006] In a first aspect, embodiments of this application provide a reagent titration device, comprising: a dropper body and a piston rod, wherein a piston head is provided at the end of the piston rod, and the piston head is sealed to the inner wall of the dropper body to form a sealed cavity inside the dropper body; the piston rod can move axially along the dropper body to change the volume of the sealed cavity; The dropper body has a first opening and a second opening on its tube wall, and both the first opening and the second opening are connected to the sealing cavity. The first opening is connected to a first connecting pipe for connecting to a reagent container, and a first valve is provided on the first connecting pipe; the second opening is connected to a second connecting pipe for adding reagent to the substance to be tested, and a second valve is provided on the second connecting pipe; When the volume of the sealed cavity tends to increase, the first valve opens and the second valve closes to connect the first connecting pipe and disconnect the second connecting pipe. When the volume of the sealed cavity tends to decrease, the first valve is closed and the second valve is opened to cut off the first connecting pipe and connect the second connecting pipe.

[0007] In some embodiments, the first valve and the second valve are one-way valves; The first valve is configured to allow fluid to flow from one end of the first connecting pipe away from the first opening to the end of the first connecting pipe connected to the first opening; The second valve is configured to allow fluid to flow from one end of the second connecting pipe connected to the second opening to the other end of the second connecting pipe away from the second opening.

[0008] In some embodiments, the reagent titration apparatus further includes a controller, which is electrically connected to the first valve and the second valve, respectively; The controller is configured to control the opening state of the first valve and the second valve.

[0009] In some embodiments, the reagent titration apparatus further includes a drive assembly comprising a push rod motor and a push rod motor extension rod, the push rod motor extension rod being connected to the piston rod; the push rod motor is electrically connected to the controller; The push rod motor is used to drive the push rod motor telescopic rod to extend and retract along the axial direction of the dropper body, so as to drive the piston rod to move along the axial direction of the dropper body.

[0010] In some embodiments, the piston rod has a radially protruding connecting portion on its body; the push rod motor telescopic rod has a connecting groove. The connecting part is accommodated in the connecting groove to form a snap-fit ​​fit; The connecting part is spherical in shape, and the shape of the connecting groove is adapted to the connecting part.

[0011] In some embodiments, the reagent titration apparatus further includes a limiting component, which restricts the movement of the piston rod when it abuts against the limiting component during axial movement.

[0012] In some embodiments, the limiting component includes: A limiting guide rail, the extension direction of which is parallel to the axial direction of the dropper body; A limiting member is slidably disposed on the limiting guide rail. When the piston rod abuts against the limiting member during axial movement, the movement of the piston rod is restricted. A fixing component is electrically connected to the controller; when the fixing component is in the first state, the relative position of the limiting component and the limiting guide rail is fixed.

[0013] Secondly, embodiments of this application provide a sodium ion detection system, including the reagent titration device described in the first aspect, wherein the substance to be detected is aluminum hydroxide filter cake, the reagent is phenolphthalein reagent, and the sodium ion detection system further includes: An image acquisition component is used to acquire a target image of the substance to be detected, wherein the target image is an image of the substance to be detected after a reagent has been added; An image processor is used to determine the sodium ion content of the substance to be detected based on the hue and saturation values ​​of pixels in the target image.

[0014] Thirdly, embodiments of this application provide a reagent titration method, wherein the reagent titration method is applied to the reagent titration apparatus described in the first aspect, and the reagent titration method includes: Control the first valve to open so that the first connecting pipeline is open, and control the second valve to close so that the second connecting pipeline is shut off; The push rod motor is controlled to drive the piston rod to move along a first direction, so that the reagent flows from the reagent container into the sealed cavity through the first connecting pipe; when the piston rod moves along the first direction, the volume of the sealed cavity tends to increase. When the piston rod abuts against the limiting member, the first valve is controlled to close, thereby shutting off the first connecting pipe, and the second valve is controlled to open, thereby opening the second connecting pipe. At the same time, the push rod motor is controlled to drive the piston rod to move in the second direction, so that the reagent flows out of the sealing cavity through the second connecting pipe. When the piston rod moves in the second direction, the volume of the sealing cavity tends to decrease.

[0015] Fourthly, embodiments of this application provide a sodium ion detection method, including the reagent titration method described in the third aspect, wherein the substance to be detected is aluminum hydroxide filter cake, the reagent is phenolphthalein reagent, and the sodium ion detection method further includes: Acquire a target image and analyze the hue and saturation values ​​of the pixels in the target image, wherein the target image is the image of the substance to be detected after the reagent is added; If the hue value of a pixel is within the range of pink hue values ​​and the saturation value is greater than the saturation threshold, then the corresponding pixel is classified into the corresponding pixel sub-interval based on the hue value and saturation value. The pixel sub-interval includes the dark pink interval, the medium pink interval, and the light pink interval. Calculate the proportion of pixels contained in each pixel sub-interval to the total number of pixels to obtain the proportion of dark pink pixels, medium pink pixels, and light pink pixels. The total number of pixels is the total number of all pink pixels contained in the target image. The sodium ion content of the substance to be detected is determined based on the proportions of pink, medium pink, and light pink pixels.

[0016] The reagent titration apparatus of this application includes a dropper body and a piston rod. A piston head is provided at the end of the piston rod, and the piston head is in a sealing fit with the inner wall of the dropper body to form a sealed cavity inside the dropper body. The piston rod moves axially along the dropper body to change the volume of the sealed cavity. A first opening and a second opening on the wall of the dropper body both communicate with the sealed cavity. The first opening is connected to a first connecting line for connecting to a reagent container. The second opening is connected to a second connecting line for adding reagent to the substance to be tested.

[0017] When aspirating reagent, the first valve opens and the second valve closes. The piston rod moves in the first direction, gradually increasing the volume of the sealed cavity. Under air pressure, the reagent flows from the reagent container into the sealed cavity through the first connecting pipe. When releasing reagent, the first valve closes and the second valve opens. The piston rod moves in the second direction, gradually decreasing the volume of the sealed cavity. Under air pressure, the reagent flows out of the sealed cavity and is dripped onto the substance to be tested through the second connecting pipe. This achieves automated reagent dispensing, reducing manual workload. Furthermore, the valves separate reagent aspiration and release throughout the entire dispensing process, thus improving operational standardization.

[0018] In addition, the sodium ion detection system of this application embodiment also includes an image acquisition component and an image processor. The image acquisition component is used to acquire a target image of the substance to be detected, which is the image of the substance to be detected after the reagent has been added. The image processor can determine the sodium ion content of the substance to be detected based on the hue and saturation values ​​of the pixels in the target image. This allows for a rapid and objective judgment of the sodium ion content, avoiding subjective visual differences and improving the accuracy of sodium ion content detection. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic perspective view of a reagent titration apparatus provided in an embodiment of this application; Figure 2 This is a schematic side view of a reagent titration apparatus provided in an embodiment of this application; Figure 3 This is a schematic top view of a reagent titration apparatus provided in an embodiment of this application; Figure 4 yes Figure 3 EE sectional view; Figure 5 yes Figure 1 Enlarged diagram of region A in the image; Figure 6 This is a schematic diagram illustrating an application scenario of a reagent titration device provided in an embodiment of this application; Figure 7 yes Figure 6 Enlarged diagram of region B in the image; Figure 8 This is a schematic perspective view of another reagent titration apparatus provided in the embodiments of this application; Figure 9 yes Figure 8 Enlarged diagram of region C in the image; Figure 10 This is a schematic perspective view of another reagent titration apparatus provided in the embodiments of this application; Figure 11 yes Figure 10 Enlarged diagram of region D in the image; Figure 12 This is a schematic flowchart of a reagent titration method provided in an embodiment of this application; Figure 13 This is a schematic flowchart of a sodium ion detection method provided in an embodiment of this application. Detailed Implementation

[0020] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0021] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, the requirement defined by the phrase "comprising one..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element. The term "two or more" includes two or more cases.

[0022] Current sodium ion detection methods rely heavily on manual operation, including manual sampling, manual reagent addition, and manual observation and judgment of color changes. This approach firstly increases the workload of operators; secondly, due to individual differences in subjective vision, ambient light interference, and inconsistent operational procedures, human judgment errors are easily introduced, leading to poor consistency and reduced reliability of test results, and making it impossible to accurately judge the "gray area" close to the critical value. Therefore, there is an urgent need for an automated detection method and device that can replace manual labor and achieve rapid, objective, and accurate judgment.

[0023] In view of this, embodiments of this application provide a reagent titration device, a detection system, a titration method, and a detection method, which can automatically titrate reagents, reduce manual workload while improving operational standardization, and can quickly and objectively determine sodium ion content, thereby improving the accuracy of sodium ion detection.

[0024] Figure 1 This is a schematic perspective view of a reagent titration apparatus provided in an embodiment of this application. Figure 2 This is a schematic side view of a reagent titration apparatus provided in an embodiment of this application. Figure 3 This is a schematic top view of a reagent titration apparatus provided in an embodiment of this application. Figure 4 This is a schematic cross-sectional view of a reagent titration apparatus provided in an embodiment of this application. Figure 5 yes Figure 1A magnified diagram of region A in the image.

[0025] like Figures 1 to 5 As shown in the embodiment of this application, the reagent titration device includes a dropper body 10 and a piston rod 20. The dropper body 10 may be a hollow cylinder, and the piston rod 20 is cylindrical. The axis of the piston rod 20 coincides with the axis of the dropper body 10. One end of the piston rod 20 is disposed inside the dropper body 10, and the other end of the piston rod 20 may be disposed outside the dropper body 10.

[0026] The piston rod 20 is located inside the dropper body 10. One end of the piston rod 20 is provided with a piston head 201. The piston head 201 is sealed to the inner wall of the dropper body 10 to form a sealed cavity 202 inside the dropper body.

[0027] The piston rod 20 can move axially along the dropper body 10 to change the volume of the sealed cavity 202. Specifically, as shown... Figure 2 and Figure 4 As shown, when the piston rod 20 moves along the X direction, the volume of the sealing cavity 202 gradually decreases, and when the piston rod 20 moves in the opposite direction of the X direction, the volume of the sealing cavity 202 gradually increases.

[0028] See also Figure 2 and Figure 4 The dropper body 10 has a first opening 101 and a second opening 102 on its tube wall, and both the first opening 101 and the second opening 102 are connected to the sealing cavity 202.

[0029] The first opening 101 is connected to a first connecting pipe 103 for connecting to the reagent container R, and a first valve 104 is provided on the first connecting pipe 103. The second opening 102 is connected to a second connecting pipe 105 for adding reagent to the substance M to be tested, and a second valve 106 is provided on the second connecting pipe 105.

[0030] When the volume of the sealed cavity 202 tends to increase, the first valve 104 opens and the second valve 106 closes to connect the first connecting pipe 103 and disconnect the second connecting pipe 105; when the volume of the sealed cavity 202 tends to decrease, the first valve 104 closes and the second valve 106 opens to disconnect the first connecting pipe 103 and connect the second connecting pipe 105.

[0031] In some embodiments, the first valve 104 and the second valve 106 can be one-way valves. The first valve 104 is configured to allow fluid to flow from the end of the first connecting pipe 103 away from the first opening 101 to the end of the first connecting pipe 103 connected to the first opening 101; the second valve 106 is configured to allow fluid to flow from the end of the second connecting pipe 105 connected to the second opening 102 to the end of the second connecting pipe 105 away from the second opening 102. That is, the first valve 104 and the second valve 106 are in opposite directions; when a reagent is drawn, the first valve 104 is open and the second valve 106 is closed, and when a reagent is dispensed, the first valve 104 is closed and the second valve 106 is open. Therefore, the reagent drawing and dispensing processes can be achieved without a controller to control the valves provided on the first connecting pipe 103 and the second connecting pipe 105.

[0032] In some embodiments, the reagent titration apparatus further includes a controller, and the first valve 104 and the second valve 106 are electrically connected to the controller. The controller switches the on / off state of the first connecting pipe 103 and the second connecting pipe 105 respectively by controlling the opening state of the first valve 104 and the second valve 106.

[0033] Figure 6 This is a schematic diagram illustrating an application scenario of a reagent titration device provided in an embodiment of this application. Figure 7 yes Figure 6 A magnified diagram of region B in the image. (See attached image.) Figure 6 and Figure 7 As shown, the reagent titration apparatus of this application is mounted on a flat plate filter using a bottom support 300, and the substance to be tested is placed inside the flat plate filter. The reagent titration apparatus also includes a titration holder 200, and the dropper body 10 is fixed to the titration holder 200 by a fixing plate. A reagent container 100 is also provided on the titration holder 200.

[0034] The reagent container 100 has a through hole at its bottom, through which the first connecting pipe 103 is connected, allowing the reagent container 100 to communicate with the sealed cavity 202. The titration holder 200 has a through hole on its base plate, through which the second connecting pipe 105 can pass, and the opening of the second connecting pipe 105 is aligned with the flat plate filter, i.e., aligned with the substance to be tested, so that the reagent in the sealed cavity 202 can be dripped onto the substance to be tested.

[0035] In this reagent titration apparatus, during reagent aspiration, the controller opens the first valve 104 and closes the second valve 106. The piston rod 20 moves along the first direction (opposite to the X direction), gradually increasing the volume of the sealed cavity 202. Therefore, the air pressure in the sealed cavity 202 gradually decreases compared to the air pressure inside the reagent container 100. To ensure effective reagent aspiration, the reagent container 100 can remain in communication with the outside air. Under air pressure, the reagent flows from the reagent container 100 into the sealed cavity 202 via the first connecting pipe 103. Furthermore, since the second valve 106 is closed, the second connecting pipe 105 has no effect on the reagent aspiration process.

[0036] In the reagent titration device of this application, when releasing the reagent, the controller closes the first valve 104 and opens the second valve 106. The piston rod 20 moves along the second direction (X direction), and the volume of the sealed cavity 202 gradually decreases. Therefore, the air pressure in the sealed cavity 202 gradually exceeds the external air pressure. Under the action of air pressure, the reagent flows out of the sealed cavity 202 and is dripped onto the substance to be detected via the second connecting pipe 105. This achieves automatic reagent dripping. The reagent titration device of this application reduces the manual workload, and the entire reagent dripping process is controlled by the controller to realize reagent absorption and release, thus improving operational standardization. Specifically, it can control the reagent dripping position, dripping rate, and dripping volume, thereby improving the accuracy of sodium ion detection by utilizing a standardized dripping process.

[0037] Additionally, multiple second connecting pipes 105 can be connected to the second opening 102, with all two connecting pipes 105 aligned with the substance to be tested. This allows for more uniform reagent application to the substance and improves application efficiency. Figure 2 As shown, the dropper body 10 can be made of transparent material, and a scale can be set on the dropper body 10 so that the movement process of the piston rod 20 can be observed, and the movement distance of the piston rod 20 can be controlled according to the scale set on the dropper body 10, thereby controlling the amount of reagent added and the dropping rate.

[0038] In some embodiments, the positions of the first opening 101 and the second opening 102 are configured such that both the path for reagent to flow into the sealed cavity 202 and the path for reagent to flow out of the sealed cavity 202 have at least a component in the direction of gravity. For example... Figure 4 As shown, a section of the first connecting pipe 103 is vertically connected to the bottom of the reagent container 100. Therefore, when the reagent flows from the reagent container 100 into the sealed cavity 202, it has both a gravitational and horizontal path. A section of the second connecting pipe 105 is vertically connected to the bottom plate of the reagent titration device. Therefore, when the reagent flows out of the sealed cavity 202, it has both a gravitational and horizontal path. When the reagent flow path has a gravitational component, the reagent flow rate can be increased, thereby improving the efficiency of reagent absorption or release.

[0039] Figure 8 This is a schematic perspective view of another reagent titration apparatus provided in the embodiments of this application. Figure 9 yes Figure 8 A magnified schematic diagram of region C in the image. In some implementations, such as... Figure 8 and Figure 9 As shown, the reagent titration apparatus also includes a drive assembly 30, which includes a push rod motor 301 and a push rod motor telescopic rod 302, with the push rod motor telescopic rod 302 connected to the piston rod 20. The push rod motor 301 is electrically connected to the controller.

[0040] The push rod motor 301 drives the push rod motor extension rod 302 to extend and retract axially along the dropper body 10, thereby moving the piston rod 20 axially along the dropper body 10. In other words, the push rod motor 301, through the push rod motor extension rod 302, drives the piston rod 20 to move axially along the dropper body 10. This movement of the piston rod 20 by the push rod motor 301 further improves the standardization of reagent dispensing operations. The controller can control the moving speed of the piston rod 20 based on the rotation speed of the push rod motor 301, thereby controlling the reagent dispensing rate. The controller can also control the moving distance of the piston rod 20 based on the number of rotations of the push rod motor, thereby controlling the reagent dispensing volume.

[0041] In some implementations, see also Figure 9 The piston rod 20 has a radially protruding connecting part 203 on its body. The push rod motor telescopic rod 302 has a connecting groove 3021. The connecting part 203 is accommodated in the connecting groove 3021 to form a snap-fit ​​fit. This not only enables the connection between the push rod motor telescopic rod 302 and the piston rod 20, but also facilitates the disassembly of the push rod motor telescopic rod 302 and the piston rod 20.

[0042] The connecting part 203 can be spherical in shape, and the corresponding shape of the connecting groove 3021 is adapted to the connecting part 203. The shape of the connecting groove 3021 can be spherical or hemispherical. The snap-fit ​​of the spherical head can improve the connection stability between the push rod motor telescopic rod 302 and the piston rod 20, thereby improving the stability of the piston rod 20's movement process and thus improving the reagent dripping stability.

[0043] In some implementations, such as Figure 9As shown, the reagent titration apparatus also includes a limiting component 40. When the piston rod 20 abuts against the limiting component 40 during axial movement, the movement of the piston rod 20 is restricted. This restriction can occur during reagent release. As the piston rod 20 moves in the X direction, reagent flows from the reagent container 100 into the sealed cavity 202. After the piston rod 20 abuts against the limiting component 40 and its movement is restricted, the flow of reagent from the reagent container 100 into the sealed cavity 202 stops, thus controlling the reagent content within the sealed cavity 202. Then, pushing the piston rod 20 in the X direction completely adds the reagent from the sealed cavity 202 to the analyte, thereby controlling the amount of reagent added to the analyte.

[0044] The movement restriction of piston rod 20 can also be implemented during reagent release. As piston rod 20 moves in the opposite direction (X), reagent flows out of sealed cavity 202. When piston rod 20 abuts against limiting component 40, and its movement is restricted, reagent stops flowing out of sealed cavity 202. This allows for direct control of the amount of reagent added to the analyte.

[0045] Specifically, such as Figure 9 As shown, the limiting assembly 40 includes a limiting guide rail 401, a limiting member 402, and a fixing member 403. The extending direction of the limiting guide rail 401 is parallel to the axial direction of the dropper body 10. The limiting member 402 is slidably disposed on the limiting guide rail 401. When the piston rod 20 abuts against the limiting member 402 during axial movement, the movement of the piston rod 20 is restricted.

[0046] The fixing member 403 can include a first state and a second state. When the fixing member 403 is in the first state, the relative position of the limiting member 402 and the limiting guide rail 401 is fixed, and the limiting member 402 can slide on the limiting guide rail 401. At this time, the limiting member 402 can limit the movement of the piston rod 20. When the fixing member 403 is in the second state, the relative position of the limiting member 402 and the limiting guide rail 401 is not fixed, and the limiting member 402 cannot slide on the limiting guide rail 401. At this time, the limiting member 402 cannot limit the movement of the piston rod 20.

[0047] like Figure 5 and Figure 9As shown, the limiting member 402 may include an L-shaped plate 4021 and a limiting block 4022, and the fixing member 403 may include a fixing plate 4031 and a fastening screw 4032. The fixing plate 4031 has a slotted groove through which the L-shaped plate 4021 passes, and the horizontal plate of the L-shaped plate 4021 is connected to the limiting guide rail 401, while the vertical plate of the L-shaped plate 4021 is in close contact with the fixing plate 4031. The limiting block 14022 is disposed on the horizontal plate of the L-shaped plate 4021. Thus, when the horizontal plate of the L-shaped plate 4021 slides along the limiting guide rail 401, it can drive the limiting block 4022 to move. When the piston rod 20 is released from the limiting block 4022, it can restrict the movement of the piston rod 20.

[0048] When the fastening screw 4032 is tightened on the vertical plate of the L-shaped plate 4021 (i.e., the fixing member is in the first state), the L-shaped plate 4021 is fixedly connected to the fixing plate 4031. Therefore, the L-shaped plate 4021 can no longer slide relative to the limiting guide rail 401. At this time, the limiting member 402 can restrict the movement of the piston rod 20. When the fastening screw 4032 is not tightened on the vertical plate of the L-shaped plate 4021 (i.e., the fixing member is in the second state), the L-shaped plate 4021 is not fixedly connected to the fixing plate 4031. Therefore, the L-shaped plate 4021 can slide relative to the limiting guide rail 401. At this time, the limiting member 402 cannot restrict the movement of the piston rod 20.

[0049] The fixed plate 4031 can also be set with a scale. The movement distance of the L-shaped plate 4021 can be controlled by displaying the scale, thereby controlling the maximum distance that the piston rod 20 can move, and thus controlling the amount of reagent drawn into the sealed cavity 202.

[0050] The fixing component 403 can also be electrically connected to a controller, which can control the switching of the fixing component 403's state. For example, an electric screwdriver (not shown in the figure) can be connected to the fastening screw 4032, and then the electric screwdriver can be electrically connected to the controller, which can control the operation of the electric screwdriver. Specifically, controlling the electric screwdriver to tighten the fastening screw 4032 switches the fixing component 403 to the first state, where the limiting component 402 can restrict the movement of the piston rod 20. Controlling the electric screwdriver to loosen the fastening screw 4032 switches the fixing component 403 to the second state, where the limiting component 402 can no longer restrict the movement of the piston rod 20.

[0051] Additionally, a drive motor can be provided for the L-shaped plate 4021. The drive motor is used to drive the L-shaped plate 4021 to move on the limiting guide rail 401. The drive motor is electrically connected to the controller, so the controller can control the operation of the drive motor, thereby controlling the distance the L-shaped plate 4021 moves on the limiting guide rail 401, thereby controlling the maximum distance the piston rod 20 can move, and thus controlling the amount of reagent drawn into the sealed cavity 202.

[0052] Figure 10 This is a schematic perspective view of another reagent titration apparatus provided in the embodiments of this application. Figure 11 yes Figure 10 A magnified diagram of region D in the image. Figure 12 This is an exemplary structural diagram of a sodium ion detection system provided in an embodiment of this application. The diagram illustrates the internal components of the image acquisition component 50. Figure 10 and Figure 11 This is a schematic 3D view of the image acquisition component 50 after removing the top cover plate 508.

[0053] Secondly, embodiments of this application provide a sodium ion detection system, including the reagent titration device of the first aspect, wherein the substance to be detected is aluminum hydroxide filter cake, and the reagent is phenolphthalein reagent. Figure 1 , Figure 10 and Figure 11 As shown, the sodium ion detection system also includes: an image acquisition component 50, used to acquire a target image of the substance to be detected, the target image being the image of the substance to be detected after the reagent is added; and an image processor, used to determine the sodium ion content of the substance to be detected based on the hue and saturation values ​​of the pixels in the target image.

[0054] The image acquisition assembly 50 comprises an image acquisition assembly frame 501, a housing 502, a top cover 508, an industrial camera 503, a lens dustproof U-shaped plate 504, a glass lens 505, a cooling fan 506, and an auxiliary light source 507. All components are mounted on the image acquisition assembly frame 501, which is fixedly connected to the titration holder 200. The housing 502 is tilted and fixed above the image acquisition assembly frame 501, and the industrial camera 503 is fixed to the upper surface of the image acquisition assembly frame 501 with screws. The glass lens 505 is located at the front end of the lens of the industrial camera 503 and is mounted on the inner wall of the housing 502. The circular hole on the lens dustproof U-shaped plate 504 is nested with the lens of the industrial camera 503, and the lens of the industrial camera 503 is within the sealed space formed by the lens dustproof U-shaped plate 504 and the glass lens 505, ensuring that the lens of the industrial camera 503 is not contaminated by dust.

[0055] Two cooling fans 506 are symmetrically distributed at a certain angle in front of the industrial camera 503, which can dissipate heat from the industrial camera 503 and prevent hot steam from affecting the glass lens 505. The top cover 508 is fixed to the top of the housing 502, so that the industrial camera 503 is located inside the housing 502. The auxiliary light source 507 is located below the image acquisition component 50. When the light is poor at night, the auxiliary light source 507 is turned on to ensure the normal detection of the industrial camera 503.

[0056] The industrial camera 503 is used to acquire target images of the substance to be detected, and then sends the target images to the image processor. The image processor determines the sodium ion content of the substance to be detected based on the hue and saturation values ​​of the pixels in the target image.

[0057] Specifically, after receiving the target image, the image processor analyzes the hue and saturation values ​​of each pixel in the target image. Then, based on the hue and saturation values ​​of each pixel, it categorizes the pixels into three sub-regions: dark pink, medium pink, and light pink. After categorization, it calculates the proportion of pixels in each of these sub-regions out of the total number of pixels. Finally, based on the calculated proportions of pixels in each of these sub-regions, the sodium ion content of the substance to be detected is determined. Therefore, the sodium ion detection system of this application can quickly and objectively determine the sodium ion content, avoiding subjective visual differences and improving the accuracy of sodium ion content detection.

[0058] Figure 12 This is a schematic flowchart of a reagent titration method provided in an embodiment of this application. Thirdly, as... Figure 12 As shown, this application provides a reagent titration method, which is applied to a reagent titration apparatus according to the first aspect. The reagent titration method includes: In step S101, the first valve 104 is opened to allow the first connecting pipe 103 to be connected, and the second valve 106 is closed to allow the second connecting pipe 105 to be shut off.

[0059] In step S102, the push rod motor 301 drives the piston rod 20 to move along the first direction (X direction), so that the reagent flows from the reagent container 100 into the sealed cavity 202 through the first connecting pipe 103. When the piston rod 20 moves along the first direction, the volume of the sealed cavity 202 tends to increase. Step S102 is the reagent aspiration process.

[0060] In step S103, when the piston rod 20 abuts against the limiting member 402, the first valve 104 is closed to shut off the first connecting pipe 103, and the second valve 106 is opened to open the second connecting pipe 105. Simultaneously, the push rod motor 301 drives the piston rod to move in the second direction (the opposite direction of the X direction) so that the reagent flows out of the sealed cavity 202 through the second connecting pipe 105. As the piston rod 20 moves in the second direction, the volume of the sealed cavity 202 tends to decrease. Step S103 is the release of the reagent, i.e., the reagent titration process. The reagent titration method of this application embodiment can automatically titrate reagents, reducing manual labor, and the fully mechanical control can improve the standardization of titration operations.

[0061] Figure 13This is a schematic flowchart illustrating a sodium ion detection method provided in an embodiment of this application. Fourthly, as... Figure 13 As shown in the embodiments of this application, a method for detecting sodium ions is provided, including a reagent titration method according to a third aspect. The substance to be detected is aluminum hydroxide filter cake, and the reagent is phenolphthalein reagent. Phenolphthalein is a commonly used acid-base indicator, colorless in acidic or neutral solutions, and turning pink in alkaline solutions. The presence of sodium ions (such as those from sodium hydroxide) increases the alkalinity (pH value) of the solution, causing phenolphthalein to turn pink. The intensity of the pink color is positively correlated with the pH value, and thus with the sodium ion concentration. Therefore, the sodium ion concentration can be determined based on the intensity of the pink color.

[0062] The sodium ion detection method of this application includes the reagent titration method of the above embodiments. After completing the reagent titration, the sodium ion detection method further includes: Step S201 involves acquiring the target image and analyzing the hue and saturation values ​​of the pixels in the target image. The target image is the image of the substance to be detected after the reagent has been added. Step S201 analyzes the hue and saturation values ​​of each pixel in the target image. For example, an image processing library (such as OpenCV) can be used to implement HSV conversion. HSV (Hue, Saturation, Value) is a color space created based on the intuitive characteristics of color, also known as the Hexcone Model. The HSV color model refers to a subset of visible light in the H, S, V three-dimensional color space, which contains all colors in a certain color gamut.

[0063] Step S202: If the hue value of a pixel is within the range of pink hue values ​​and the saturation value is greater than the saturation threshold, then the corresponding pixel is classified into the corresponding pixel sub-interval based on the hue value and saturation value. The pixel sub-interval includes the dark pink interval, the medium pink interval, and the light pink interval.

[0064] The typical hue value range for pink is 320°-350°. Furthermore, the target image may contain white backgrounds, bubbles, or impurities, areas with low saturation. Setting a saturation threshold can exclude these non-pink pixels. Analyzing only pixels with saturation above a certain minimum (e.g., 20%) ensures that only colored areas are considered, improving the accuracy of the analysis.

[0065] Therefore, if the hue value of a pixel is within the pink hue value range and its saturation value is greater than the saturation value threshold, then the pixel can be identified as a pink pixel. Conversely, if the hue value of a pixel is not within the pink hue value range, or its saturation value is less than or equal to the saturation value threshold, then the pixel is identified as a non-pink pixel.

[0066] If a pixel is identified as pink, it is then categorized into a specific sub-range based on its hue and saturation values. These sub-ranges include deep pink, medium pink, and light pink. For example, the deep pink range has a hue value of 320°-330° and high saturation (e.g., saturation > 80%); the medium pink range has 330°-340° and medium saturation (e.g., saturation 50%-80%); and the light pink range has 340°-350° and low saturation (e.g., saturation < 50%). Phenolphthalein's pink color deepens with increasing pH (the hue shifts towards a purplish-red, and saturation increases). Subdividing these sub-ranges allows for more precise matching of color variations.

[0067] Step S203: Calculate the proportion of pixels in each sub-region to the total number of pixels, obtaining the proportions of dark pink, medium pink, and light pink pixels. The total number of pixels is the total number of pink pixels in the target image. Step S203 can obtain the distribution of each sub-region, for example, dark pink accounts for 40%, medium pink accounts for 50%, and light pink accounts for 10%.

[0068] Step S204: Determine the sodium ion content of the substance to be detected based on the proportions of pink, medium pink, and light pink pixels. In step S204, the dominant shade of pink can be determined based on the pixel proportions or average values. If the proportion of dark pink pixels is the highest, it is determined to be dark pink, corresponding to a high sodium ion content.

[0069] If the proportion of medium pink pixels is the highest, it is determined to be medium pink, corresponding to a medium sodium ion content. If the proportion of light pink pixels is the highest, it is determined to be light pink, corresponding to a low sodium ion content. This allows for a quick and objective determination of sodium ion content, avoiding subjective visual differences and improving the accuracy of sodium ion content detection. Furthermore, this embodiment quantifies the proportion of pink pixels, thus enabling accurate judgment of "gray areas" approaching the threshold value.

[0070] Furthermore, a calibration curve (relationship curve) between color intensity and sodium ion concentration can be pre-established using a standard solution (with known sodium ion concentration) to achieve quantitative analysis. For example, by reacting sodium solutions of different concentrations with phenolphthalein, capturing images, and analyzing the pink distribution, a sodium ion content analysis model can be constructed. In specific applications of sodium ion content detection, the captured target image can be imported into the sodium ion content analysis model to directly determine the specific sodium ion content, further improving the accuracy of sodium ion content detection.

[0071] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0072] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

[0073] Although preferred embodiments have been described in this specification, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this specification.

[0074] Obviously, those skilled in the art can make various modifications and variations to this specification without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, this specification is also intended to include such modifications and variations.

Claims

1. A reagent titration apparatus, characterized in that, include: The dropper body and the piston rod are provided with a piston head at the end of the piston rod. The piston head is sealed to the inner wall of the dropper body to form a sealed cavity inside the dropper body. The piston rod can move along the axial direction of the dropper body to change the volume of the sealed cavity. The dropper body has a first opening and a second opening on its tube wall, and both the first opening and the second opening are connected to the sealing cavity. The first opening is connected to a first connecting pipe for connecting to a reagent container, and a first valve is provided on the first connecting pipe; the second opening is connected to a second connecting pipe for adding reagent to the substance to be tested, and a second valve is provided on the second connecting pipe; When the volume of the sealed cavity tends to increase, the first valve opens and the second valve closes to connect the first connecting pipe and disconnect the second connecting pipe. When the volume of the sealed cavity tends to decrease, the first valve is closed and the second valve is opened to cut off the first connecting pipe and connect the second connecting pipe. The reagent titration apparatus further includes a controller, which is electrically connected to the first valve and the second valve respectively; the controller is configured to control the opening state of the first valve and the second valve. The reagent titration device further includes a drive assembly, which includes a push rod motor and a push rod motor telescopic rod, and the push rod motor telescopic rod is connected to the piston rod. The push rod motor is electrically connected to the controller; the push rod motor is used to drive the push rod motor telescopic rod to extend and retract along the axial direction of the dropper body, so as to drive the piston rod to move along the axial direction of the dropper body; The reagent titration device also includes a limiting component, which restricts the movement of the piston rod when it comes into contact with the limiting component during axial movement. The limiting component includes: a limiting guide rail, the extending direction of which is parallel to the axial direction of the dropper body; a limiting member, slidably disposed on the limiting guide rail, wherein the movement of the piston rod is restricted when it abuts against the limiting member during axial movement; and a fixing member, electrically connected to the controller; wherein when the fixing member is in a first state, the relative position of the limiting member and the limiting guide rail is fixed.

2. The reagent titration apparatus according to claim 1, characterized in that, The first valve and the second valve are check valves; The first valve is configured to allow fluid to flow from one end of the first connecting pipe away from the first opening to the end of the first connecting pipe connected to the first opening; The second valve is configured to allow fluid to flow from one end of the second connecting pipe connected to the second opening to the other end of the second connecting pipe away from the second opening.

3. The reagent titration apparatus according to claim 1, characterized in that, The piston rod has a radially protruding connecting part on its body; the push rod motor telescopic rod has a connecting groove. The connecting part is accommodated in the connecting groove to form a snap-fit ​​fit; The connecting part is spherical in shape, and the shape of the connecting groove is adapted to the connecting part.

4. A sodium ion detection system, characterized in that, The reagent titration apparatus comprising any one of claims 1 to 3, wherein the substance to be detected is aluminum hydroxide filter cake, the reagent is phenolphthalein reagent, and the sodium ion detection system further comprises: An image acquisition component is used to acquire a target image of the substance to be detected, wherein the target image is an image of the substance to be detected after a reagent has been added; An image processor is used to determine the sodium ion content of the substance to be detected based on the hue and saturation values ​​of pixels in the target image.

5. A reagent titration method, characterized in that, The reagent titration method is applied to the reagent titration apparatus according to any one of claims 1 to 3, and the reagent titration method includes: Control the first valve to open so that the first connecting pipeline is open, and control the second valve to close so that the second connecting pipeline is shut off; The push rod motor is controlled to drive the piston rod to move along a first direction, so that the reagent flows from the reagent container into the sealed cavity through the first connecting pipe; when the piston rod moves along the first direction, the volume of the sealed cavity tends to increase. When the piston rod abuts against the limiting member, the first valve is controlled to close, thereby shutting off the first connecting pipe, and the second valve is controlled to open, thereby opening the second connecting pipe. At the same time, the push rod motor is controlled to drive the piston rod to move in the second direction, so that the reagent flows out of the sealing cavity through the second connecting pipe. When the piston rod moves in the second direction, the volume of the sealing cavity tends to decrease.

6. A method for detecting sodium ions, characterized in that, Including the reagent titration method of claim 5, wherein the substance to be detected is aluminum hydroxide filter cake, the reagent is phenolphthalein reagent, and the sodium ion detection method further includes: Acquire a target image and analyze the hue and saturation values ​​of the pixels in the target image, wherein the target image is the image of the substance to be detected after the reagent is added; If the hue value of a pixel is within the range of pink hue values ​​and the saturation value is greater than the saturation threshold, then the corresponding pixel is classified into the corresponding pixel sub-interval based on the hue value and saturation value. The pixel sub-interval includes the dark pink interval, the medium pink interval, and the light pink interval. Calculate the proportion of pixels contained in each pixel sub-interval to the total number of pixels to obtain the proportion of dark pink pixels, medium pink pixels, and light pink pixels. The total number of pixels is the total number of all pink pixels contained in the target image. The sodium ion content of the substance to be tested is determined based on the proportions of dark pink, medium pink, and light pink pixels.

Images