An on-line floating matter monitoring device for alumina decomposition

Abstract

The application relates to the technical field of alumina production monitoring, in particular to an online floating object monitoring device for alumina decomposition. The device comprises a shell assembly, a plurality of piston cylinders, a plurality of piston pieces consistent with the number of the piston cylinders, a driving mechanism, a plurality of monitoring probes consistent with the number of the piston cylinders and a main controller. The shell assembly is detachably installed on the wall of an alumina decomposition tank, the plurality of piston cylinders are arranged on the shell assembly in the length direction of the shell assembly, the shell assembly is hollow inside and communicates with the piston cylinders, the piston pieces are respectively slidably assembled in the corresponding piston cylinders, the monitoring probes are respectively installed on the corresponding piston pieces, the driving mechanism is used for driving the piston pieces to slide along the piston cylinders in the axial direction, the main controller is electrically connected with the monitoring probes and the driving mechanism, is used for collecting the floating object concentration data detected by the monitoring probes at different depths, and controls the driving mechanism to complete the extension and retraction switching action of the piston pieces. The application can improve the accuracy of monitoring data.

Description

Technical Field

[0001] This application relates to the field of alumina production monitoring technology, and in particular to an online floating matter monitoring device for alumina decomposition. Background Technology

[0002] The decomposition process in alumina production is the core process for preparing aluminum hydroxide. The concentration of suspended solids in the high-temperature, strong-alkali sodium aluminate slurry within the decomposition tank is a key process parameter for determining the decomposition progress, crystallization particle size, and production stability. Accurate and stable online monitoring is crucial for ensuring product quality and stable production conditions. Meanwhile, the alumina decomposition tank operates under harsh conditions. The slurry is characterized by high solids content, high temperature, and strong alkalinity. Influenced by feed and discharge, temperature gradients, and natural crystal settling, the slurry exhibits significant vertical concentration stratification and is prone to natural convection and longitudinal mixing, often resulting in the accumulation of foam and scum on the surface.

[0003] A search revealed that Chinese invention patent CN113418843A discloses an online detection device and method for suspended solids content in alumina production processes. The device includes a test tube, a monitoring probe, a PLC controller, and a manual valve and an electric valve respectively installed at the inlet and outlet of the test tube. The manual valve is always open, while the electric valve's opening and closing are controlled by the PLC controller. The monitoring probe is located outside the test tube and is driven by the PLC controller. When the light transmittance of the solution changes during alumina production, the monitoring probe converts the light signal into an electrical signal and feeds it back to the PLC controller. The PLC controller calculates the suspended solids content based on the received electrical signal from the monitoring probe.

[0004] During use, slurry is drawn from the decomposition tank through a pipeline and transported to an external test tube. Concentration is detected using an external fiber optic transmission probe. The slurry after testing and the waste liquid generated from rinsing with room temperature water are directly returned to the decomposition tank.

[0005] The above technical solution requires the slurry to be transported over long distances via pipelines, which can easily lead to problems such as cooling and crystallization, pipeline blockage, and distortion of solid particle sedimentation. This results in a decrease in the accuracy of monitoring data, and the detection data is also lagging, failing to truly reflect the real-time in-situ working conditions within the tank. Summary of the Invention

[0006] To improve the accuracy of monitoring data, this application provides an online airborne solids monitoring device for alumina decomposition, employing the following technical solution: An online airborne matter monitoring device for alumina decomposition includes: Housing assembly, multiple piston cylinders, piston components of the same number as the piston cylinders, drive mechanism, monitoring probes of the same number as the piston cylinders, and main controller; The housing assembly is detachably mounted on the wall of the alumina decomposition tank. A plurality of piston cylinders are arranged in an array on the housing assembly along the length direction of the housing assembly. The housing assembly is hollow inside and communicates with each of the piston cylinders. The piston components are slidably assembled into the corresponding piston cylinders, the monitoring probes are respectively mounted on the corresponding piston components, and the driving mechanism is used to drive each piston component to slide along the piston cylinder axis; The main controller is electrically connected to each monitoring probe and drive mechanism, and is used to collect the concentration data of planktonic matter detected by each depth monitoring probe, and control the drive mechanism to complete the piston extension and retraction switching action.

[0007] By adopting the above technical solution, the entire device is immersed inside the slurry for operation. During operation, the main controller controls the drive mechanism to move, causing multiple sets of pistons to slide synchronously. This allows the monitoring probes at each depth to be directly in the corresponding depth of the slurry within the tank, eliminating the need for long-distance pipeline transportation of the slurry. This fundamentally avoids problems such as slurry cooling and crystallization, pipeline blockage, and distortion caused by solid particle sedimentation. It also eliminates detection errors caused by sampling and transportation. At the same time, it can collect data on suspended solids at different depths inside the decomposition tank in real time. Furthermore, since the probes are located inside the piston cylinder during monitoring, they can effectively avoid external interference such as slurry turbulence, surface foam and scum, and longitudinal mixing of the slurry within the tank. This also prevents the probes from being directly scourd by high-speed slurry or directly impacted by impurities, thus improving the stability of the detection process.

[0008] Optionally, the piston component is provided with an mounting rod and a sealing plate, the monitoring probe is disposed on the mounting rod, and a sealing plate is disposed at the end of the mounting rod away from the piston component. The sealing plate is coaxially disposed with the piston component and is used to seal the opening of the piston cylinder away from the housing assembly.

[0009] By adopting the above technical solution, in the non-monitoring standby state, the piston retracts completely, and the monitoring probe is entirely housed and hidden inside the piston cylinder. The sealing plate tightly seals the outer opening of the piston cylinder, completely isolating the probe from the slurry in the tank. This prevents continuous slurry scouring, high-speed flow field impact, and surface scum and solid particles from adhering and contaminating the probe's detection surface, effectively protecting the probe structure and preventing long-term scouring wear and accumulation failure. During monitoring operations, the piston drives the mounting rod and monitoring probe to extend out of the piston cylinder and into the in-situ slurry at the corresponding depth in the decomposition tank. After sampling, it quickly retracts and resets, accurately drawing the actual in-situ slurry at that depth into the piston cylinder cavity during retraction. After retraction, the sealing plate automatically closes the piston cylinder opening again, completely sealing and storing the slurry to be tested inside the piston cylinder, thoroughly isolating it from the external dynamically flowing slurry. At this time, the probe completes the detection of suspended matter concentration in a closed, static slurry environment without flow or turbulent impact, which further avoids the data fluctuation and distortion problems caused by slurry disturbance, longitudinal mixing and fluid impact in traditional in-situ detection, and improves the stability, accuracy and repeatability of the detection data.

[0010] Optionally, a sealing gasket is provided at one end of the sealing plate near the piston.

[0011] By adopting the above technical solution, the sealing gasket can further improve the sealing performance of the sealing plate on the piston cylinder opening, and achieve complete sealing and isolation of the piston cylinder end.

[0012] Optionally, the driving mechanism includes a driving member, a moving rod, and connecting rods in the same number as the piston members. The driving member is disposed inside the housing assembly. The moving rod is slidably disposed on the housing assembly along the length direction of the housing assembly. One end of each connecting rod is rotatably connected to the moving rod. One end of the piston member facing the connecting rod has a connecting rod. The other end of the connecting rod is rotatably connected to the corresponding connecting rod. The driving member is used to drive the moving rod to move.

[0013] By adopting the above technical solution and using a linkage transmission structure, multiple sets of pistons can be synchronously extended and retracted through the drive component. The structure has strong linkage and high transmission stability, which can ensure that the monitoring probes at various depths extend and retract synchronously, thus ensuring the synchronicity of monitoring data acquisition at different depths.

[0014] Optionally, the driving component is an electric push rod, the housing end of which is fixedly disposed within the housing assembly, and the telescopic rod end of which is connected to the moving rod.

[0015] By adopting the above technical solution, the electric push rod drive is precise and highly controllable, enabling precise displacement adjustment of the moving rod and control of the extension and retraction stroke of the piston, thereby adjusting the detection depth of the monitoring probe and adapting to the detection needs of different depths in the alumina decomposition tank.

[0016] Optionally, the system also includes a monitoring probe cleaning mechanism, which includes a main inlet pipe, inlet branch pipes corresponding to the number of piston cylinders, an outlet pipe, branch pipes corresponding to the number of piston cylinders, an inlet pump, and a suction pump. One end of the inlet pump is connected to a clean water storage end, and the other end is connected to the main inlet pipe. Each inlet branch pipe is connected to the main inlet pipe and the interior of the corresponding piston cylinder, for conveying cleaning medium into the closed cleaning chamber formed by the piston cylinder. The suction pump is connected to the outlet pipe, and each outlet branch pipe is connected to the outlet pipe and the interior of the corresponding piston cylinder, for uniformly extracting and discharging the waste liquid after cleaning. Both the inlet pump and the outlet pump are electrically connected to the main controller.

[0017] By adopting the above technical solution, after the monitoring probe retracts and the piston cylinder opening is sealed by the sealing plate, an independent, sealed cleaning chamber is formed inside the piston cylinder. The cleaning mechanism can be automatically activated by the main controller to deliver cleaning medium into the sealed piston cylinder, thoroughly rinsing the detection surface of the monitoring probe and the inner wall of the piston cylinder. This effectively removes slurry scale and solid particulate impurities adhering to the probe surface, preventing long-term accumulation of impurities that could affect subsequent detection accuracy. The entire cleaning operation is completed within the independent, sealed chamber of the piston cylinder, completely isolating it from the slurry inside the decomposition tank. The cleaning medium and cleaning waste liquid will not seep into or flow back into the decomposition tank, thus solving to some extent the problem of cleaning water contaminating the production slurry in the tank, damaging the decomposition tank's operating conditions, and affecting the purity of the slurry components. Simultaneously, the waste liquid after cleaning can be centrally discharged via a pump in conjunction with the outlet branch pipe and the outlet main pipe, achieving centralized waste liquid treatment.

[0018] Optionally, each of the inlet branch pipes is equipped with a solenoid valve for controlling the opening and closing of the inlet branch pipe.

[0019] By adopting the above technical solution, each inlet branch pipe is independently equipped with a solenoid valve, which can independently control the on / off state and start / stop of a single inlet branch pipe. This improves the problem of uneven distribution and inconsistent flow of cleaning fluid in the upper and lower piston cylinders caused by differences in pipeline pressure difference and liquid level when multiple branches supply liquid simultaneously. The cleaning medium flow rate and cleaning time of the corresponding branch pipe can be individually adjusted according to the degree of contamination and cleaning requirements of different depth probes, avoiding uneven cleaning defects such as excessive cleaning in the upper layer and insufficient cleaning in the lower layer, and ensuring uniform cleaning effect for each monitoring probe and each piston cylinder cavity.

[0020] Optionally, the housing assembly is connected to the alumina decomposition tank via a mounting assembly, the mounting assembly including a U-shaped frame and a locking bolt, one side of the U-shaped frame is fixedly mounted on the housing assembly, the locking bolt is threadedly connected to the other side of the U-shaped frame, the U-shaped frame is suspended on the upper wall of the alumina decomposition tank, and the locking bolt is used to tighten against the tank wall of the alumina decomposition tank.

[0021] By adopting the above technical solution and using a suspended installation structure, the device is easy to assemble and disassemble, and is firmly fixed. It does not require drilling or modification of the decomposition tank, and will not damage the original structure of the equipment. It is compatible with the installation and use of various conventional alumina decomposition tanks. At the same time, by tightening the locking bolts, it can effectively prevent the device from loosening or shifting under the impact of slurry and equipment vibration, ensuring the stability of the device during operation. Furthermore, it is convenient for later inspection, disassembly and maintenance, and improves the efficiency of equipment disassembly, assembly and maintenance.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. The drive mechanism drives multiple sets of piston components and the monitoring probe to perform reciprocating movements. During operation, the probe extends to collect in-situ slurry at the corresponding depth. After sampling, it quickly retracts and seals the cavity through a sealing plate, isolating the slurry to be tested inside the piston cylinder to complete static detection. The entire process eliminates the need for long-distance slurry extraction, completely avoiding problems such as cooling and crystallization, pipeline blockage, and solid particle sedimentation and stratification distortion during slurry transportation. Simultaneously, the closed-cavity static detection method eliminates data disturbances caused by dynamic turbulence and longitudinal mixing of the slurry, effectively solving the shortcomings of traditional detection methods such as data lag and low operational condition reproduction, thus improving the authenticity and accuracy of suspended solids concentration monitoring. 2. After the monitoring probe retracts and the sealing plate closes the piston cylinder opening, an independent and sealed cleaning chamber is formed inside the piston cylinder. The cleaning mechanism can be automatically started by the main controller to deliver cleaning medium into the sealed piston cylinder and flush the detection surface of the monitoring probe and the inner wall of the piston cylinder in all directions. This effectively removes the slurry scale and solid particle impurities attached to the probe surface, and avoids the long-term accumulation of impurities that may affect the accuracy of subsequent detection. 3. Each inlet branch pipe is independently equipped with a solenoid valve, which can control the opening and closing of a single inlet branch pipe. This improves the problem of uneven distribution of cleaning fluid and inconsistent flow rate of the upper and lower piston cylinders caused by differences in pipeline pressure and liquid level when multiple branches supply liquid at the same time. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the monitoring device in the embodiments of this application; Figure 2 This is a partial three-dimensional structural schematic diagram of the monitoring device in the embodiments of this application; Figure 3 This is a three-dimensional structural diagram of the drive mechanism after partial cross-section in this application; Figure 4 This is a three-dimensional structural diagram of the monitoring probe cleaning mechanism in the embodiments of this application.

[0024] Reference numerals: 100, housing assembly; 200, piston cylinder; 300, piston component; 310, mounting rod; 320, sealing plate; 330, connecting rod; 400, drive mechanism; 410, drive component; 420, moving rod; 430, connecting rod; 500, monitoring probe; 600, monitoring probe cleaning mechanism; 610, main inlet pipe; 620, branch inlet pipe; 630, main outlet pipe; 640, branch outlet pipe; 650, inlet pump; 660, outlet pump; 700, solenoid valve; 800, mounting assembly; 810, U-shaped bracket; 820, locking bolt. Detailed Implementation

[0025] The following combination Figures 1 to 4 This application will be described in further detail.

[0026] This embodiment discloses an online floating matter monitoring device for alumina decomposition. Example

[0027] This application discloses an online floating matter monitoring device for alumina decomposition, including a housing assembly 100, multiple sets of piston cylinders 200, an equal number of piston parts 300, a drive mechanism 400, multiple sets of monitoring probes 500, and a main controller.

[0028] The housing assembly 100 serves as the main load-bearing structure of the device. It is assembled and fixed to the alumina decomposition tank via a mounting assembly 800. The mounting assembly 800 includes a U-shaped frame 810 and locking bolts 820. The U-shaped frame 810 is fixed to the outside of the housing assembly 100 and is suspended from the upper wall of the decomposition tank. The locking bolts 820 tighten against the tank wall for positioning and fixation. The entire assembly uses a non-drilling external mounting method. After assembly, the housing assembly 100 is rectangular in shape, completely enclosed externally, and hollow internally. The housing assembly 100 is suspended and immersed in the slurry of the decomposition tank. Multiple sets of piston cylinders 200 are arranged in an array along the height of the housing assembly 100, with each piston cylinder 200 vertically spaced at intervals, corresponding to different vertical depths of the slurry in the decomposition tank to meet the requirements for stratified slurry concentration monitoring. The internal cavity of the housing assembly 100 communicates with each piston cylinder 200, providing installation space for the internal drive structure and piping layout.

[0029] Each piston cylinder 200 has a piston component 300 slidably mounted axially inside. A mounting rod 310 is fixedly mounted on the side of the piston component 300 facing the outer end of the piston cylinder 200. A monitoring probe 500 is fixedly mounted at the end of the mounting rod 310 for real-time acquisition of slurry suspended solids concentration signals. A sealing plate 320 is coaxially fixed at the outermost end of the mounting rod 310. A sealing gasket is mounted on the inner side of the sealing plate 320, which moves synchronously with the piston component 300. This sealing plate 320 is used to seal the outer opening of the piston cylinder 200 after the piston component 300 retracts, achieving airtight isolation of the internal cavity of the piston cylinder 200.

[0030] The drive mechanism 400 is integrally assembled in the hollow area inside the housing assembly 100. The drive mechanism 400 includes a drive component 410, a moving rod 420, and connecting rods 430 matching the number of piston components 300. The drive component 410 is preferably an electric push rod, with its fixed end fixed to the inner wall of the housing assembly 100. The telescopic end of the electric push rod is fixedly connected to the horizontally sliding moving rod 420. The moving rod 420 slides and is limited along the length of the housing assembly 100. A set of connecting rods 430 is rotatably connected between the moving rod 420 and the connecting rods 330 of each piston component 300, forming a multi-point synchronous connecting rod 430 transmission structure. When the electric push rod extends or retracts, it can drive the moving rod 420 to move as a whole, and then, through multiple sets of connecting rods 430, synchronously push and pull each set of piston components 300, causing all piston components 300, mounting rods 310, and monitoring probes 500 to extend or retract synchronously, ensuring consistent action at multiple depth detection points.

[0031] In normal standby mode, the electric push rod is in the retracted state, which drives each set of piston components 300 to be completely housed inside the piston cylinder 200. The sealing plate 320 fits against the outer port of the piston cylinder 200, and the end face is sealed by the sealing gasket. The monitoring probe 500 is completely hidden inside the cavity of the piston cylinder 200, and the slurry in the tank cannot come into contact with the probe surface.

[0032] When the device performs online monitoring, the main controller outputs control signals according to a preset program, initiating the extension of the electric push rod. This pushes the moving rod 420 to slide, driving all piston components 300 to extend outward synchronously via the connecting rod 430. This allows the monitoring probes 500 corresponding to each depth to pass through the piston cylinder 200 and enter the in-situ slurry at the corresponding depth in the decomposition tank. After the probes have fully contacted and sampled the in-situ slurry, the main controller controls the electric push rod to quickly retract and reset, causing all sets of piston components 300 and probes to retract synchronously into the piston cylinder 200. During the retraction of the piston components 300, the in-situ slurry at the current depth is drawn into the piston cylinder 200. After the piston components 300 are fully reset, the sealing plate 320 presses and seals the port of the piston cylinder 200, sealing the extracted slurry within the independent cavity of the piston cylinder 200. The slurry inside the cavity remains static. The monitoring probes 500 complete concentration signal acquisition within the sealed static cavity and transmit the detection data back to the main controller in real time, completing one multi-depth synchronous detection process.

[0033] Furthermore, this device is also equipped with a monitoring probe cleaning mechanism 600, which includes an inlet main pipe 610, multiple sets of inlet branch pipes 620, an outlet main pipe 630, multiple sets of outlet branch pipes 640, an inlet pump 650, and a suction pump. The inlet pump 650 is connected to an external clean water source at its input end and to the inlet main pipe 610 at its output end. Each inlet branch pipe 620 is connected to the inlet main pipe 610 and to the interior of each set of piston cylinders 200. Each inlet branch pipe 620 is independently equipped with a solenoid valve 700 for individually controlling the on / off state and flow rate of a single cleaning medium. Each outlet branch pipe 640 is connected to each set of piston cylinders 200 and to the outlet main pipe 630. The outlet main pipe 630 is externally connected to a suction pump for uniformly extracting waste liquid from the chamber and discharging it. The inlet pump 650, the suction pump, and all solenoid valves 700 are electrically connected to the main controller and are controlled by the main controller's unified logic.

[0034] After one or more inspections are completed, the device enters automatic cleaning mode. The main controller, based on preset logic or the level of contamination at each location, independently opens the solenoid valve 700 of the corresponding branch pipe, starting the inlet pump 650 to deliver cleaning medium into the sealed cavity of the corresponding piston cylinder 200, rinsing the probe surface and the inner wall of the piston cylinder 200. The entire cleaning process takes place inside the sealed piston cylinder 200 cavity, which is isolated from the decomposition tank, preventing the cleaning medium from entering the decomposition tank. After cleaning, the main controller starts the suction pump to extract the waste liquid from each cavity through the outlet branch pipe 640 and the main outlet pipe 630 for unified discharge. After cleaning at a single location, the corresponding solenoid valve 700 is closed, awaiting the next round of inspection and cleaning cycle.

[0035] The implementation principle of this application embodiment is as follows: The entire device is suspended and fixed to the wall of the alumina decomposition tank via the hanging assembly 800. The entire structure is immersed in the slurry. Multiple sets of piston cylinders 200 arranged in an array on the housing assembly 100 correspond to different slurry depths in the decomposition tank to achieve stratified point monitoring. In the standby state, each piston component 300 is completely retracted into the piston cylinder 200. The sealing plate 320, together with the sealing gasket, presses the port of the piston cylinder 200, so that the monitoring probe 500 is completely housed in the sealed cavity of the piston cylinder 200, and the probe is completely isolated from the flowing slurry in the tank.

[0036] When the monitoring process begins, the main controller outputs a control signal to activate the drive mechanism 400. The electric push rod extends and retracts, causing the moving rod 420 to slide as a whole. Through multiple sets of connecting rods 430, all piston components 300 are simultaneously driven to extend outward along the axial direction of the piston cylinder 200, so that the monitoring probes 500 corresponding to each depth simultaneously extend out of the piston cylinder 200 and are immersed in the in-situ slurry at the corresponding height in the decomposition tank, completing the in-situ slurry contact sampling. After the preset sampling time is completed, the electric push rod drives the moving rod 420 to reverse and reset, pulling each set of piston components 300 to retract synchronously. During the retraction process, the in-situ slurry at each depth position is simultaneously brought in and drawn into the corresponding piston cylinder 200 cavity. After the piston components 300 are completely reset, the sealing plate 320 presses and seals the piston cylinder 200 port again, sealing the extracted slurry inside an independent cavity, so that the slurry inside the cavity is completely isolated from the flowing slurry in the tank and allowed to settle and stabilize. Subsequently, each monitoring probe 500 completes the collection of airborne solids concentration in a sealed and undisturbed cavity, and transmits the detection electrical signal back to the main controller in real time, completing a round of multi-depth synchronous detection.

[0037] After one or more rounds of testing, the device enters an automatic cleaning process. The main controller starts the inlet pump 650 and the extraction pump as needed, and independently controls the opening and closing of the solenoid valves 700 on each inlet branch pipe 620 according to the actual working conditions of each depth probe. Cleaning medium is metered into the sealed cavity of the corresponding piston cylinder 200 to rinse the probe detection surface and the inner wall of the piston cylinder 200. The waste liquid after cleaning is collected through the outlet branch pipe 640 to the main outlet pipe 630, and then uniformly extracted and discharged by the extraction pump. The entire cleaning process is completed within the independent cavity of the piston cylinder 200, and neither the medium nor the waste liquid comes into contact with the slurry inside the decomposition tank. After the cleaning operation is completed, all solenoid valves 700 close, the pumps stop working, and the device resets to a sealed standby state, cyclically waiting for the next round of testing commands, thus continuously completing automated online layered monitoring and self-cleaning operations.

[0038] The above are all 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 floating matter monitoring device for alumina decomposition, characterized in that: include: The housing assembly (100), multiple piston cylinders (200), piston parts (300) in the same number as the piston cylinders (200), drive mechanism (400), monitoring probes (500) in the same number as the piston cylinders (200), and main controller; The housing assembly (100) is detachably mounted on the wall of the alumina decomposition tank. A plurality of piston cylinders (200) are arranged in an array along the length of the housing assembly (100). The housing assembly (100) is hollow inside and communicates with each of the piston cylinders (200). The piston components (300) are slidably assembled in the corresponding piston cylinders (200), the monitoring probes (500) are respectively installed on the corresponding piston components (300), and the driving mechanism (400) is used to drive each piston component (300) to slide along the axial direction of the piston cylinder (200); The main controller is electrically connected to each monitoring probe (500) and drive mechanism (400) respectively, and is used to collect the concentration data of planktonic matter detected by each depth monitoring probe (500) and control the drive mechanism (400) to complete the extension and retraction switching action of the piston (300).

2. The online floating matter monitoring device for alumina decomposition according to claim 1, characterized in that: The piston component (300) is provided with an mounting rod (310) and a sealing plate (320). The monitoring probe (500) is provided on the mounting rod (310). The end of the mounting rod (310) away from the piston component (300) is provided with a sealing plate (320). The sealing plate (320) is coaxially arranged with the piston component (300) and is used to seal the opening of the piston cylinder (200) away from the housing assembly (100).

3. The online floating matter monitoring device for alumina decomposition according to claim 2, characterized in that: A sealing gasket is provided at one end of the sealing plate (320) near the piston (300).

4. The online floating matter monitoring device for alumina decomposition according to claim 1, characterized in that: The drive mechanism (400) includes a drive member (410), a moving rod (420), and connecting rods (430) in the same number as the piston member (300). The drive member (410) is disposed inside the housing assembly (100). The moving rod (420) is slidably disposed on the housing assembly (100) along the length direction of the housing assembly (100). One end of each connecting rod (430) is rotatably connected to the moving rod (420). The piston member (300) has a connecting rod (330) at one end facing the connecting rod (430). The other end of the connecting rod (430) is rotatably connected to the corresponding connecting rod (330). The drive member (410) is used to drive the moving rod (420) to move.

5. The online floating matter monitoring device for alumina decomposition according to claim 4, characterized in that: The driving component (410) is an electric push rod, the housing end of which is fixedly disposed in the housing assembly (100), and the telescopic rod end of which is connected to the moving rod (420).

6. The online floating matter monitoring device for alumina decomposition according to claim 1, characterized in that: It also includes a monitoring probe cleaning mechanism (600), which includes a main inlet pipe (610), inlet branch pipes (620) corresponding to the number of piston cylinders (200), a main outlet pipe (630), branch pipes corresponding to the number of piston cylinders (200), an inlet pump (650), and a suction pump; one end of the inlet pump (650) is connected to the clean water storage end, and the other end is connected to the main inlet pipe (610), and each inlet branch pipe (620) The inlet main pipe (610) is connected to the interior of the corresponding piston cylinder (200) to deliver the cleaning medium into the closed cleaning chamber formed by the piston cylinder (200); the pump is connected to the outlet main pipe (630), and each outlet branch pipe (640) is connected to the outlet main pipe (630) and the interior of the corresponding piston cylinder (200) to uniformly extract and discharge the waste liquid after cleaning; the inlet pump (650) and the outlet pump (660) are both electrically connected to the main controller.

7. The online floating matter monitoring device for alumina decomposition according to claim 6, characterized in that: Each of the inlet branch pipes (620) is equipped with a solenoid valve (700) for controlling the opening and closing of the inlet branch pipes (620).

8. The online floating matter monitoring device for alumina decomposition according to claim 1, characterized in that: The housing assembly (100) is connected to the alumina decomposition tank via a mounting assembly (800). The mounting assembly (800) includes a U-shaped frame (810) and a locking bolt (820). One side of the U-shaped frame (810) is fixedly mounted on the housing assembly (100), and the locking bolt is threadedly connected to the other side of the U-shaped frame (810). The U-shaped frame (810) is suspended on the upper wall of the alumina decomposition tank, and the locking bolt (820) is used to press against the wall of the alumina decomposition tank.

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