Online hydrochloric acid concentration detection device for pickling line

Abstract

The utility model discloses a pickling line hydrochloric acid concentration on-line detection device, and relates to the technical field of pickling line equipment, the pickling line hydrochloric acid concentration on-line detection device comprises a storage box connected with a plurality of feeding pipes communicated with a pickling tank; the reaction container is communicated with the storage box through a first connecting pipe; the indicator tank is communicated with the reaction container through a second connecting pipe, and an indicator for detecting the acid solution is filled in the indicator tank; the reaction tank is communicated with the top of the reaction container through a third connecting pipe and is filled with a sodium hydroxide solution; the placing platform is used for placing the reaction container; a metering pump is mounted on the feeding pipe; micro pumps are mounted on the first connecting pipe, the second connecting pipe and the third connecting pipe; the light source lamp is mounted on one side of the reaction container and faces the reaction container; and the color identification device is arranged on one side of the reaction container and is used for identifying the color of the liquid in the reaction container. The device has the effect of improving the PH detection accuracy of the solution in the pickling tank.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of pickling unit equipment, in particular to an on-line hydrochloric acid concentration detection device for a pickling unit. BACKGROUND

[0002] The pickling unit is equipment for pickling strip steel, and the strip steel is subjected to pickling treatment by hydrochloric acid in the pickling tank.

[0003] The pickling unit needs to detect the hydrochloric acid concentration in the pickling tank on line through an acid concentration detection device. Generally, the pickling unit has multiple pickling tanks, and the solution PH in the pickling tank is arranged in a ladder shape to improve the pickling effect of the strip steel. Therefore, the solution in the pickling tank needs to be detected on line, and acid needs to be added in time when the PH value changes. The existing on-line hydrochloric acid concentration detection device in the pickling tank generally establishes a mathematical model through parameters such as electrical conductivity, density and temperature, and then calculates the hydrochloric acid concentration.

[0004] This way of detecting the concentration of hydrochloric acid will cause a large difference between the measured concentration and the laboratory measured value due to the influence of the increase of pickling hydrochloric acid and other ions and solid suspensions. Further, detection errors are generated, which will directly affect the quality of the pickled strip steel.

[0005] Therefore, a new on-line hydrochloric acid concentration detection device for a pickling unit needs to be designed, which can reduce the influence of the solid suspensions and other ions in the hydrochloric acid. CONTENT OF THE INVENTION

[0006] The purpose of the application is to reduce the influence of the solid suspensions and other ions added in the pickling hydrochloric acid on the detection of the concentration of hydrochloric acid. The application provides an on-line hydrochloric acid concentration detection device for a pickling unit.

[0007] The on-line hydrochloric acid concentration detection device for a pickling unit provided by the application adopts the following technical scheme:

[0008] The on-line hydrochloric acid concentration detection device for a pickling unit comprises

[0009] The storage tank is connected with multiple feed pipes, and the other end of the feed pipe is in communication with the pickling tank.

[0010] The reaction container is arranged below the storage tank, and the top is connected with the first connecting pipe which is in communication with the bottom of the storage tank. The reaction container is made of acid-resistant transparent material.

[0011] The indicator tank is erected on one side of the storage tank, and the bottom is connected with the second connecting pipe which is in communication with the top of the reaction container. The interior is filled with an indicator for detecting the acidic solution.

[0012] The reaction vessel is mounted on one side of the storage tank. A third connecting pipe is connected to the bottom of the vessel, and the other end of the third connecting pipe is connected to the top of the reaction vessel. The vessel is filled with sodium hydroxide solution.

[0013] A placement platform is erected at the bottom of the reaction vessel, and the reaction vessel is placed on the placement platform;

[0014] The feed pipe is equipped with a metering pump, and the first connecting pipe, the second connecting pipe and the third connecting pipe are all equipped with micro pumps;

[0015] The light source is installed on one side of the reaction vessel and faces the reaction vessel;

[0016] The color recognition device, installed on one side of the reaction vessel, identifies the color of the liquid inside the reaction vessel. It is connected to a color graphics processing system to identify the color of the liquid inside the reaction vessel. When the color changes to the color recorded by the system, the micro pump of the third connecting tube is turned off.

[0017] Optionally, both the reaction vessel and the storage tank have drain pipes with valves connected to their bottoms.

[0018] Optionally, a cleaning tank is installed above the storage tank, with a fourth connecting pipe at the bottom of the cleaning tank. The other end of the fourth connecting pipe is connected to the top of the storage tank. A metering pump is also installed on the fourth connecting pipe. The cleaning tank contains demineralized water.

[0019] Optionally, a magnetic stirrer is embedded in the platform, the bottom of the reaction vessel abuts against the middle of the upper surface of the magnetic stirrer, and a magnetic stir bar is placed inside the reaction vessel.

[0020] Optionally, a light-shielding shell is provided on the outside of the reaction vessel, which encloses the reaction vessel. The color recognition device and the light source are both located inside the light-shielding shell.

[0021] Optionally, two adjustment frames are fixed on the upper surface of the platform, and sliding plates are slidably connected inside the adjustment frames. The light source and color recognition device are installed on different sliding plates. The connecting wire is located inside the sliding plate and extends from the top. A fastening rod is threaded on the adjustment frame, and the fastening rod can be pressed against the sliding plate.

[0022] Optionally, the two sliders can be set to be non-relative.

[0023] Optionally, the light-shielding shell consists of two parts. The placement platform has an insertion slot for inserting the bottom of the light-shielding shell. The light-shielding shell abuts against the side wall of the adjustment frame. One side wall of the light-shielding shell is rotatably connected to a fixing hook plate, and the other light-shielding shell is fixed with a fixing rod. The fixing hook plate can be locked onto the fixing rod so that the two light-shielding shells abut against the adjustment frame.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. The solution in the pickling tank is quantitatively controlled and sequentially enters the storage tank and reaction vessel. In the reaction vessel, it is mixed with the added indicator to develop color. Then, the sodium hydroxide solution in the reaction vessel is added dropwise. After the solution in the reaction vessel changes color to the set color, it is identified by the color recognition device and the addition of sodium hydroxide is stopped. At this time, the amount of sodium hydroxide added is recorded and the acid value is calculated. The setting of the light source can effectively improve the accuracy of liquid color recognition in the reaction vessel. In this way, the pH of the solution in the pickling tank can be identified online, which can effectively reduce the influence of suspended solids and other ions on pH detection and improve the detection accuracy.

[0026] 2. The relay setting of the storage tank can effectively reduce the amount of solution discharged from the pickling tank into the next container under pressure, thereby effectively controlling the amount of solution added and improving the detection accuracy;

[0027] 3. The storage tank is connected to multiple pickling tanks, so that after the solution in one pickling tank is tested, the reaction tank and storage tank are cleaned with demineralized water before the acidity of the solution in the next pickling tank is tested, thus improving the efficiency of step pH detection for multiple pickling tanks.

[0028] 4. The light-shielding shell effectively reduces the influence of ambient light, thus reducing color errors in the reaction vessel under the light source. The design of the light-shielding shell also facilitates its disassembly.

[0029] 5. The adjustment frame and sliding plate allow for easy position adjustment of the color recognition device and light source, while preventing light leakage. Attached Figure Description

[0030] Figure 1 This is a structural schematic diagram of an embodiment of this application;

[0031] Figure 2 This is a partial schematic diagram showing a micro-infusion pump;

[0032] Figure 3 This is a partial schematic diagram showing the reaction vessel after a light-blocking shell has been hidden.

[0033] In the diagram, 1 is the storage tank; 11 is the feed pipe; 111 is the metering pump; 12 is the drain pipe; 2 is the reaction vessel; 21 is the first connecting pipe; 211 is the metering pump; 3 is the indicator tank; 31 is the second connecting pipe; 4 is the reaction vessel; 41 is the third connecting pipe; 5 is the placement platform; 51 is the light shield; 511 is the fixing hook plate; 512 is the fixing rod; 52 is the magnetic stirrer; 53 is the insertion slot; 54 is the adjusting frame; 541 is the sliding plate; 542 is the fastening rod; 6 is the light source; 7 is the color recognition device; 8 is the cleaning tank; and 81 is the fourth connecting pipe. Detailed Implementation

[0034] The following is in conjunction with the appendix Figures 1-3 This application will be described in further detail.

[0035] This application discloses an online detection device for hydrochloric acid concentration in a pickling unit.

[0036] refer to Figure 1 , Figure 2 and Figure 3 The online hydrochloric acid concentration detection device for the pickling unit includes a storage tank 1, a reaction vessel 2, an indicator tank 3, a reaction tank 4, a placement platform 5, a light source 6, a color recognition device 7, a cleaning tank 8, and a light-shielding shell 51. Multiple feed pipes 11 are connected to the top of the storage tank 1, with the other end of each feed pipe 11 connected to a pickling tank. Each feed pipe 11 is connected to only one pickling tank. The reaction vessel 2 is mounted below the storage tank 1, with a first connecting pipe 21 connected to its top. The other end of the first connecting pipe 21 is connected to the bottom of the storage tank 1. The reaction vessel 2 is made of acid-resistant transparent material; in this embodiment, it is made of glass.

[0037] The indicator container 3 is mounted on one side of the storage tank 1, and a second connecting pipe 31 is connected to the bottom. The other end of the second connecting pipe 31 is connected to the top of the reaction vessel 2. The indicator container 3 contains an indicator for detecting acidic solutions. In this embodiment, the indicator is a methyl orange solution.

[0038] The reaction vessel 4 is mounted on one side of the storage tank 1, and its bottom is connected to a third connecting pipe 41. The other end of the third connecting pipe 41 is connected to the top of the reaction vessel 2. The reaction vessel 4 contains a sodium hydroxide solution.

[0039] A cleaning tank 8 is mounted above the storage tank 1. A fourth connecting pipe 81 is connected to the bottom of the cleaning tank 8, and the other end of the fourth connecting pipe 81 is connected to the top of the storage tank 1. The cleaning tank 8 contains demineralized water. Both the reaction vessel 2 and the storage tank 1 are connected to a drain pipe 12, which has a valve. A metering pump 111 is installed on both the feed pipe 11 and the fourth connecting pipe 81. A micro-pump 211 is installed on the first connecting pipe 21, the second connecting pipe 31, and the third connecting pipe 41.

[0040] A placement platform 5 is mounted at the bottom of the reaction vessel 2. A magnetic stirrer 52 is embedded within the placement platform 5, and the reaction vessel 2 is placed on the upper surface of the magnetic stirrer 52. The magnetic stir bar of the magnetic stirrer 52 is located inside the reaction vessel 2. A light-shielding shell 51 is installed on the placement platform 5 to shield the reaction vessel 2. A light source 6 and a color recognition device 7 are both installed inside the light-shielding shell 51 and aligned with the reaction vessel 2. The color recognition device 7 is used to identify the color of the liquid inside the reaction vessel 2 and is connected to a color graphics processing system. When the color of the liquid inside the reaction vessel 2 changes to the color recorded by the system, the micro-pump 211 of the third connecting pipe 41 is turned off, and the liquid value passing through the micro-pump 211 of the third connecting pipe 41 is recorded, thereby calculating the pH value of the liquid inside the reaction vessel 2. In this embodiment, the color recognition device 7 is a CCD color camera. The top cover of the reaction vessel 2 is made of light-shielding material.

[0041] There are multiple pickling tanks, and the pH value of the solution in each tank is generally arranged in a stepped manner to achieve a better pickling effect as the strip passes through sequentially. Therefore, it is necessary to maintain the pH value of the solution in each pickling tank at all times to maintain this stepped arrangement. When testing the solution in one of the pickling tanks, the corresponding feed pipe 11 draws the liquid from the pickling tank into the storage tank 1 via a metering pump 111. Using the storage tank 1 as a relay storage location, the liquid is then metered into the reaction vessel 2 via a micro-pump 211 connected to the first connecting pipe 21. Using the storage tank 1 as a relay storage container effectively reduces the probability of increased solution volume due to excessive pressure in the pickling tank, reduces leakage, and thus improves the accuracy of subsequent solution pH testing.

[0042] Indicator solution is added dropwise from indicator tank 3 to reaction container 2 via second connecting pipe 31. Reaction container 2 is illuminated by light source 6, and the liquid color in reaction container 2 is identified and recorded by color recognition device 7. The light-shielding shell 51 effectively reduces the influence of ambient light, thereby improving the efficiency of color recognition device 7 in identifying the liquid color in reaction container 2. Subsequently, sodium hydroxide solution is added dropwise from reaction tank 4 to reaction container 2 via third connecting pipe 41. After the color of the solution in reaction container 2 changes to the corresponding color observed by color recognition device 7, the micro-pump 211 of third connecting pipe 41 is turned off. The pH of the solution in the pickling tank is calculated based on the amount added, obtained from the on / off time of micro-pump 211. This online detection method effectively reduces the influence of solid suspended matter and other ions added during the pickling process in the pickling tank, thereby improving the accuracy of online pH detection of the solution in the pickling tank.

[0043] After the solution in one pickling tank is tested, the liquid in storage tank 1 and reaction vessel 2 is drained through drain pipe 12, and demineralized water is discharged into storage tank 1 and reaction vessel 2 through fourth connecting pipe 81 to rinse storage tank 1 and reaction vessel 2, thereby reducing the impact of the remaining solution on the pH measurement of the solution in the next pickling tank.

[0044] refer to Figure 2 and Figure 3 Two adjusting frames 54 are fixedly mounted on the upper surface of the placement platform 5. The two adjusting frames 54 are at a 90° angle to the side of the reaction vessel 2 and are both opposite to the central vertical axis of the reaction vessel 2. A fastening plate 541 is slidably connected inside the adjusting frame 54. The light source 6 and the color recognition device 7 are both mounted on different fastening plates 541, with the connecting wire located inside the fastening plate 541 and extending from the top. A fastening rod 542 is threaded onto the adjusting frame 54, and the fastening rod 542 can abut against the fastening plate 541. The light-shielding shell 51 consists of two parts. The placement platform 5 has an insertion slot 53 for inserting the bottom of the light-shielding shell 51, which abuts against the side wall of the adjusting frame 54. A fixing hook plate 511 is rotatably connected to the side wall of one of the light-shielding shells 51, and a fixing rod 512 is fixed on the other light-shielding shell 51. The fixing hook plate 511 can be locked onto the fixing rod 512, causing the two light-shielding shells 51 to abut against the adjusting frame 54.

[0045] The light-shielding shell 51 is detachable, facilitating its removal for maintenance of the light source 6 and color recognition device 7, and replacement of the reaction vessel 2. The two light-shielding shells 51 are secured to the adjusting frame 54 by rotating the fixing hook plate 511 and clamping it to the fixing rod 512 of another light-shielding shell 51, thus completing the installation and fixation of the light-shielding shells 51. The insertion slot 53 further enhances the stability of the light-shielding shells 51. The sliding mechanism between the fastening plate 541 and the adjusting frame 54 allows for position adjustment of the internal light source 6 and color recognition device 7 without disassembling the light-shielding shells 51, and the fixing rod 512 secures the fastening plate 541. The design of the adjusting frame 54 and the fastening plate 541 also effectively reduces the probability of light transmission through the adjusting structure of the adjusting frame 54.

[0046] The implementation principle of the online hydrochloric acid concentration detection device for a pickling unit in this application embodiment is as follows: The solution in the corresponding pickling tank is added to the storage tank 1 through the inlet pipe, and then the solution in the storage tank 1 is quantitatively added to the reaction vessel 2 through the first connecting pipe 21. The indicator tank 3 quantitatively adds indicator to the reaction vessel 2 through the second connecting pipe 31 to color the solution in the reaction vessel 2. Subsequently, the reaction tank 4 continuously and quantitatively adds sodium hydroxide solution to the reaction vessel 2 through the third connecting pipe 41, and the color of the solution in the reaction vessel 2 is observed by the color recognition device 7. When the color of the solution in the reaction vessel 2 changes to the color recorded by the system, the micro pump 211 of the third connecting pipe 41 stops working. The amount added is calculated by the start time of the micro pump 211 of the third connecting pipe 41, and then the pH value of the solution in the corresponding pickling tank is calculated. By performing online detection in this way, the influence of suspended solids and other ions mixed in during the pickling process can be effectively reduced, and the accuracy of online detection of pH in the pickling tank can be improved.

[0047] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An online detection device for hydrochloric acid concentration in a pickling unit, characterized in that: include Storage box (1) is connected to multiple feed pipes (11), and the other end of the feed pipes (11) is connected to the pickling tank; The reaction vessel (2) is located below the storage box (1), and the top is connected to the first connecting pipe (21). The first connecting pipe (21) is connected to the bottom of the storage box (1). The reaction vessel (2) is made of acid-resistant transparent material. The indicator container (3) is mounted on one side of the storage box (1), with a second connecting pipe (31) connected to the bottom. The other end of the second connecting pipe (31) is connected to the top of the reaction vessel (2), and the container is filled with an indicator for detecting acidic solutions. The reaction vessel (4) is mounted on one side of the storage tank (1), and a third connecting pipe (41) is connected to the bottom. The other end of the third connecting pipe (41) is connected to the top of the reaction vessel (2), and the interior is filled with sodium hydroxide solution. The placement platform (5) is set up at the bottom of the reaction vessel (2), and the reaction vessel (2) is placed on the placement platform (5); A metering pump (111) is installed in the feed pipe (11), and micro pumps (211) are installed in the first connecting pipe (21), the second connecting pipe (31) and the third connecting pipe (41); A light source (6) is installed on one side of the reaction vessel (2) and faces the reaction vessel (2); The color recognition device (7) is installed on one side of the reaction container (2) to identify the color of the liquid in the reaction container (2). It is connected to the color graphics processing system to identify the color of the liquid in the reaction container (2). When the color changes to the color recorded by the system, the micro pump (211) of the third connecting pipe (41) is turned off.

2. The online detection device for hydrochloric acid concentration in a pickling unit according to claim 1, characterized in that: Both the reaction vessel (2) and the storage tank (1) are connected to a drain pipe (12) with a valve at the bottom.

3. The online detection device for hydrochloric acid concentration in a pickling unit according to claim 2, characterized in that: A cleaning tank (8) is installed above the storage tank (1). The bottom of the cleaning tank (8) is connected to a fourth connecting pipe (81). The other end of the fourth connecting pipe (81) is connected to the top of the storage tank (1). A metering pump (111) is also installed on the fourth connecting pipe (81). The cleaning tank (8) contains demineralized water.

4. The online detection device for hydrochloric acid concentration in a pickling unit according to claim 1, characterized in that: A magnetic stirrer (52) is embedded in the platform (5). The bottom of the reaction container (2) is in contact with the middle of the upper surface of the magnetic stirrer (52). A magnetic stir bar is placed inside the reaction container (2).

5. The online detection device for hydrochloric acid concentration in a pickling unit according to claim 1, characterized in that: The reaction vessel (2) is equipped with a light-shielding shell (51), which encloses the reaction vessel (2). The color recognition device (7) and the light source (6) are both located inside the light-shielding shell (51).

6. The online detection device for hydrochloric acid concentration in a pickling unit according to claim 5, characterized in that: Two adjustment frames (54) are fixed on the upper surface of the placement platform (5). A sliding plate (541) is slidably connected inside the adjustment frame (54). The light source (6) and the color recognition device (7) are installed on different sliding plates (541). The connecting line is located inside the sliding plate (541) and extends from the top. A fastening rod (542) is threaded on the adjustment frame (54). The fastening rod (542) can abut against the sliding plate (541).

7. The online detection device for hydrochloric acid concentration in a pickling unit according to claim 6, characterized in that: The two sliders are not set relative to each other.

8. The online detection device for hydrochloric acid concentration in a pickling unit according to claim 6, characterized in that: The light-shielding shell (51) consists of two parts. The placement platform (5) has an insertion slot (53) for inserting the bottom of the light-shielding shell (51). The light-shielding shell (51) abuts against the side wall of the adjustment frame (54). One side wall of the light-shielding shell (51) is rotatably connected to a fixing hook plate (511), and the other light-shielding shell (51) is fixed with a fixing rod (512). The fixing hook plate (511) can be locked on the fixing rod (512) so that the two light-shielding shells (51) abut against the adjustment frame (54).

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