Negative pressure dust collection and collecting device for aluminum electrolysis

Abstract

The application relates to the technical field of clean production, and specifically discloses a negative pressure dust collection and material collecting device for aluminum electrolysis, which comprises a mobile chassis, a negative pressure dust collection system, a material collecting and separating module and a directional conveying mechanism, wherein the negative pressure dust collection system comprises an ejector, the material collecting and separating module comprises a vacuum round barrel, and the directional conveying mechanism comprises a pneumatic conveying chute or a screw conveyor; the vacuum round barrel is arranged at the upper portion of the mobile chassis, the bottom of the vacuum round barrel is provided with a discharge port, the upper end of the vacuum round barrel is provided with an air inlet, and the air inlet is connected with the ejector through flanges; one end of the ejector is provided with a gas inlet, and the gas inlet is connected with a compressed air pipeline through a quick connector; a material suction port is arranged in the middle upper portion of the barrel body of the vacuum round barrel, and the material suction port is connected with a material suction hose through flanges; the material collecting and separating module is arranged in the vacuum round barrel and comprises a sedimentation buffer bin, a cyclone separator, a filter bin and a material collecting hopper; and the directional conveying mechanism comprises a feeding device and a pneumatic conveying system.

Description

Technical Field

[0001] This application relates to the field of clean production technology, specifically to a negative pressure dust collection device for aluminum electrolysis. Background Technology

[0002] Dust pollution is a common problem in the electrolytic aluminum production process. Since most of the raw materials used are in powder form, such as alumina (including fluorinated alumina), carbon, cryolite, aluminum fluoride, electrolytes, and covering materials, dust is inevitably generated during the production process.

[0003] In the aluminum electrolysis production process, the laying and replenishment of covering material (usually a mixture of alumina and fluoride salts) is a crucial step in ensuring the thermal balance of the electrolytic cell and reducing electrolyte volatilization. Currently, the industry generally adopts a "fixed-point feeding + manual leveling" model, which has three major pain points: First, dust easily escapes during the transfer and feeding of covering material, causing not only material waste (annual loss rate can reach 3%-5%), but also polluting the workshop environment and endangering the health of workers; second, the space around the electrolytic cell is narrow, and traditional fixed dust collection equipment cannot flexibly cover different cell positions, resulting in incomplete dust collection in corner areas; third, when manually cleaning scattered covering material, frequent entry into the dangerous area of ​​the electrolytic cell is required, resulting in high labor intensity and safety hazards such as high temperature and electric shock. Furthermore, the recovered material is mixed with impurities and cannot be directly reused, further increasing production costs. Summary of the Invention

[0004] The purpose of this application is to provide a negative pressure dust collection device for aluminum electrolysis to solve the problems in the prior art.

[0005] To achieve the above objectives, this application provides a negative pressure dust collection device for aluminum electrolysis, comprising: a mobile chassis, a negative pressure dust collection system, a material separation module, and a directional conveying mechanism, wherein... The negative pressure dust collection system includes an ejector, the material collection and separation module includes a vacuum drum, and the directional conveying mechanism includes a pneumatic conveying chute or a screw conveyor. The vacuum cylinder is mounted on the upper part of the mobile chassis. The bottom of the vacuum cylinder is provided with a discharge port, and the upper end of the vacuum cylinder is provided with a vent. The vent is connected to the ejector through a flange. The ejector is provided with an air inlet at one end, and the air inlet is connected to a compressed air pipeline via a quick connector. The vacuum cylinder has a suction port in the upper part of its body, and the suction port is connected to a suction hose via a flange. The material separation module is installed in the vacuum drum and includes a settling buffer chamber, a cyclone separator, a filter chamber, and a material collection hopper. The directional conveying mechanism includes a feeding device and a pneumatic conveying system.

[0006] Optionally, the settling buffer silo is provided with the suction port, which is connected to the suction hose through a flange. The shell of the settling buffer silo is composed of a conical cylinder that is larger at the top and smaller at the bottom, and a manual slide valve or an electric ash discharge valve is provided at the bottom of the silo.

[0007] Optionally, the cyclone separator is located after the settling buffer chamber. Its top tangential air inlet pipe is connected to the air outlet of the settling buffer chamber. The lower part is a conical constriction hopper with an exhaust pipe in the center. The upper part of the cyclone separator body is a vertical cylinder with a spiral top plate at the top, forming a narrow annular channel with the outer wall of the exhaust pipe to guide the airflow downward. The bottom end of the conical constriction hopper is connected to an ash discharge port, which is connected to the collection hopper through a flange.

[0008] Optionally, the filter chamber is connected after the exhaust pipe of the cyclone separator. The filter chamber is a sealed chamber with a pulse jet bag filter suspended inside. The clean air zone of the filter chamber is connected to the air vent.

[0009] Optionally, the collecting hopper is located directly below the cyclone separator and is a hopper with a conical bottom. The side wall of the collecting hopper is provided with an observation window, and the bottom outlet of the collecting hopper is connected to the discharge port.

[0010] Optionally, the feeding device is located at the discharge port and is equipped with a rotary feed valve; The pneumatic conveying system includes a power source, a conveying pump, and a conveying pipeline.

[0011] Optionally, the settling buffer chamber, cyclone separator, and filter chamber are rigidly connected by flanges and gaskets to form an integral structure, which is installed on the mobile chassis. The hopper outlet, rotary feed valve inlet, and conveying pump inlet are sequentially connected by flanges.

[0012] Optionally, the mobile chassis is an explosion-proof electric tracked chassis, or the mobile chassis is equipped with four rotatable wheels and a locking device at the bottom. A non-slip, insulated handle is installed on one side of the chassis.

[0013] Optionally, the mobile chassis is provided with a liftable support, and the vacuum cylinder is mounted on the liftable support; The liftable support includes: a base frame, a top platform, a scissor arm assembly, and a drive system. The base frame is fixed to the mobile chassis; The top plate platform is rigidly fixed to the bottom end of the vacuum cylinder; The bottom end of the scissor arm assembly is connected to two parallel guide rails on the base frame via rollers or sliders, and the top end of the scissor arm assembly is connected to the top plate platform via rollers or sliders. The drive system is an electric push rod. The cylinder end of the electric push rod is mounted on the base frame via a hinge, and the push rod end of the electric push rod is connected to the bottom roller bracket of the lowest scissor arm assembly via a hinge.

[0014] Optionally, the other end of the ejector is provided with an exhaust port, which is connected to the negative pressure port of the electrolytic cell exhaust.

[0015] The embodiments of this application have the following advantages: This application, with its unique negative air pressure generator and rotary multi-stage dust removal technology, not only has a simple structure and convenient operation, but also has a significant dust removal effect.

[0016] This application integrates negative pressure dust removal, material collection, impurity separation, and precise backfeeding functions to achieve closed-loop management of the entire process of "dispersion-recovery-reuse" of the covering material. The development of this device can not only reduce dust pollution and improve material utilization, but also reduce manual intervention, which is in line with the development trend of "greening, intelligence, and reduced manpower" in the aluminum electrolysis industry, and has significant economic and environmental value.

[0017] The device described in this application has a compact structure and is easy to install. It can significantly recover materials such as alumina in the electrolysis workshop and effectively solve the problem of dust pollution. It performs all-round vacuum cleaning of the electrolysis workshop, including the top of the equipment, thereby avoiding secondary pollution caused by dust disturbance. Attached Figure Description

[0018] To more clearly illustrate the embodiments of this application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0019] Figure 1 A structural block diagram of a negative pressure dust collection device for aluminum electrolysis provided in at least one embodiment of this application; Figure 2 A schematic diagram of the structure of a negative pressure dust collection device for aluminum electrolysis provided in at least one embodiment of this application; Figure 3 A schematic diagram of the material collection and separation module of a negative pressure dust collection device for aluminum electrolysis, provided for at least one embodiment of this application; Figure 4This is a structural block diagram of a cyclone separator for a negative pressure dust collection device for aluminum electrolysis, provided for at least one embodiment of this application.

[0020] Explanation of reference numerals in the attached figures: 1. Mobile chassis; 2. Rotatable wheels; 3. Anti-slip insulated handle; 4. Vacuum drum; 5. Discharge port; 6. Vent port; 7. Ejector; 8. Air inlet; 9. Quick connector; 10. Suction port; 11. Suction hose; 12. Exhaust port; 13. Settling buffer chamber; 14. Cyclone separator; 15. Filter chamber; 16. Collection hopper. Detailed Implementation

[0021] The following specific embodiments illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0023] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0024] This application provides a negative pressure dust collection device for aluminum electrolysis. By integrating negative pressure dust removal, material collection, impurity separation, and precise backfeeding functions, it achieves closed-loop management of the entire process of "dispersion-recovery-reuse" of the covering material. The development of this device not only reduces dust pollution and improves material utilization, but also reduces manual intervention, aligning with the "green, intelligent, and less-manned" development trend of the aluminum electrolysis industry, and possessing significant economic and environmental value. (Reference) Figures 1 to 4The device includes: a mobile chassis 1, a negative pressure dust collection system, a material separation module, and a directional conveying mechanism.

[0025] The negative pressure dust collection system includes an ejector 7, the material collection and separation module includes a vacuum drum 4, and the directional conveying mechanism includes a pneumatic conveying chute or a screw conveyor.

[0026] Specifically, the negative pressure suction port of the negative pressure dust collection system enables efficient dust collection and material collection of the covering material. The material collection and separation module has a built-in screening component to remove impurities. Then, the qualified recycled material is directly fed back to the electrolytic cell coverage area through a directional conveying mechanism, forming a closed loop of "dust collection-material collection-purification-returning". This not only solves the dust pollution in the workshop, but also realizes the resource reuse of the covering material, reducing raw material loss and labor costs.

[0027] In some embodiments, the mobile chassis 1 adopts an explosion-proof electric tracked chassis, which is adapted to the uneven ground of the electrolysis workshop, with a minimum turning radius of ≤1.5m, and can flexibly shuttle between adjacent electrolysis cells; In other embodiments, the mobile chassis 1 is provided with four rotatable wheels 2 and a locking device at the bottom, allowing it to rotate 360°. A non-slip, insulated handle 3 is provided on one side of the chassis.

[0028] The vacuum cylinder 4 is installed on the upper part of the mobile chassis 1. The bottom of the vacuum cylinder 4 is provided with a discharge port 5, and the upper end of the vacuum cylinder 4 is provided with a vent 6. The vent 6 is connected to the ejector 7 through a flange.

[0029] In some embodiments, the mobile chassis 1 is provided with a liftable support, and the vacuum drum 4 is mounted on the liftable support, supporting the adjustment of the height of the suction port 10 of the vacuum drum 4 within the range of 0.8-2.2m, adapting to the covering material operation height of electrolytic cells of different specifications.

[0030] In some embodiments, the liftable support includes: a base frame, a top platform, a scissor arm assembly, and a drive system, wherein... The base frame is welded from high-strength rectangular steel pipes and fixed to the mobile chassis 1 by bolts. The base frame provides the installation foundation for the entire lifting system. The top plate platform is rigidly fixed to the bottom end of the vacuum cylinder 4 by bolts; The bottom end of the scissor arm assembly is connected to two parallel guide rails on the base frame via rollers or sliders, and the top end of the scissor arm assembly is connected to the top plate platform via rollers or sliders. The drive system is an electric push rod. The cylinder end of the electric push rod is mounted on the base frame via a hinge, and the push rod end of the electric push rod is connected to the bottom roller bracket of the lowest scissor arm assembly via a hinge.

[0031] Specifically, when the drive system pushes the bottom of the scissor arm assembly to move horizontally, the entire "X" structure extends or retracts longitudinally under the constraint of the hinge point, thereby realizing the vertical lifting and lowering of the top plate platform.

[0032] One end of the ejector 7 is provided with an air inlet 8, which is connected to a compressed air pipeline via a quick connector 9.

[0033] In some embodiments, the other end of the ejector 7 is provided with an exhaust port 12, which is connected to the negative pressure port of the electrolytic cell exhaust gas. This can increase the negative pressure of the electrolytic cell flue gas while exhausting the gas, thereby accelerating the flow of the electrolytic cell flue gas towards the purification pipe.

[0034] The vacuum cylinder 4 has a suction port 10 in the upper part of its body. The suction port 10 is connected to a suction hose 11 through a flange. The suction hose 11 has a certain length and can be moved to absorb excess covering material on the anode carbon block group of the electrolytic cell or the covering material in the upper interlayer of the electrolytic cell.

[0035] The material separation module is installed in the vacuum drum 4 and includes a settling buffer chamber 13, a cyclone separator 14, a filter chamber 15, and a collection hopper 16, wherein: The settling buffer chamber 13 is equipped with a suction port 10, which is connected to a suction hose 11 via a flange. The shell of the settling buffer chamber 13 is a conical cylinder that is wider at the top and narrower at the bottom. A manual gate valve or an electric ash discharge valve is installed at the bottom of the chamber. The settling buffer chamber 13 utilizes the sudden expansion of the airflow channel to cause a rapid drop in flow velocity. Larger, coarser particles in the suction material (such as small pieces of electrolyte or anode debris) settle directly to the bottom of the chamber under their own gravity. When a certain amount has been collected, the manual gate valve or electric ash discharge valve at the bottom of the chamber can be opened to discharge these large particles into a dedicated collection vehicle, preventing them from entering subsequent systems and causing wear or contamination.

[0036] The cyclone separator 14 is located after the settling buffer chamber 13. Its top tangential air inlet pipe is connected to the air outlet of the settling buffer chamber 13. The lower part is a conical constriction hopper with an exhaust pipe at the center. The upper part of the cyclone separator 14 body is a vertical cylinder with a spiral top plate, forming a narrow annular channel with the outer wall of the exhaust pipe, guiding the airflow downwards. The bottom of the conical constriction hopper is connected to a ash discharge port, which is connected to the collection hopper 16 via a flange. A star-shaped unloader is connected below the ash discharge port as an airlock device. The cyclone separator 14 is used for coarse gas-solid separation. The dust-laden airflow enters tangentially, forming a high-speed rotating vortex. Under centrifugal force, most (approximately 80%-90%) of the qualified covering material is thrown against the wall of the separator and slides down the conical hopper wall to the collection hopper 16 at the bottom. The preliminarily purified gas then rises through the central exhaust pipe.

[0037] The filter chamber 15 is connected after the exhaust pipe of the cyclone separator 14. The filter chamber 15 is a sealed chamber with a pulse-jet bag filter suspended inside. The clean air zone of the filter chamber 15 is connected to the air vent 6. The filter chamber 15 is used for gas-solid fine separation. The airflow, still carrying fine dust after cyclone separation, enters the filter chamber 15. As it passes through the filter bags, fine dust particles <10μm in diameter are trapped on the outer surface of the bags, while clean air passes through. The filter chamber 15 uses compressed air pulse backflushing (the air source comes from the workshop's compressed air pipeline network) for periodic automatic dust removal to ensure the air permeability of the filter bags. Dust shaken off from the outer surface of the filter bags falls into the fine dust collection hopper at the bottom of the filter chamber 15. This dust is mainly ultrafine alumina, which can be collected periodically and treated uniformly, or reused depending on the process.

[0038] The collecting hopper 16 is located directly below the cyclone separator 14 and is a hopper with a conical bottom. An observation window is provided on the side wall of the collecting hopper 16, and the bottom outlet of the collecting hopper 16 is connected to the discharge port 5. It serves as both a temporary storage bin for qualified covering material and a transition bin for feeding material to the directional conveying mechanism. A high-temperature resistant observation window is used for real-time monitoring of the material level. An external vibrating motor is installed to prevent damp covering material from bridging or forming clumps inside the hopper, ensuring smooth material discharge.

[0039] Specifically, the module adopts a multi-stage series purification scheme of "first-stage inertial sedimentation + second-stage cyclone separation + third-stage fine filtration" to ensure separation efficiency and high-purity recovery.

[0040] The directional conveying mechanism includes a feeding device and a pneumatic conveying system, wherein: The feeding device is located at the discharge port 5 and is equipped with a rotary feeding valve; it is used to uniformly and continuously feed the covering material from the collection hopper 16 into the conveying pipeline.

[0041] The pneumatic conveying system includes a power source, a conveying pump, and a conveying pipeline. The power source utilizes existing compressed air in the workshop as the power medium. The conveying pump is a Venturi pump or a low-pressure continuous conveying pump. When compressed air passes through the pump, a negative pressure is generated at the rear of the nozzle, drawing in and mixing the material from the rotary feed valve to form a gas-solid two-phase flow. The conveying pipeline uses wear-resistant bends and extends from the pump outlet to above the electrolytic cell. The end of the pipeline is a swingable or retractable discharge head.

[0042] Specifically, the directional conveying mechanism is responsible for accurately and quantitatively returning the purified and qualified covering material collected in the collecting hopper 16 to the covering material area of ​​the electrolytic cell.

[0043] Specifically, the settling buffer chamber 13, cyclone separator 14, and filter chamber 15 are rigidly connected by flanges and gaskets to form an integral structure, which is installed on the mobile chassis 1. The outlet of the collection hopper 16, the inlet of the rotary feed valve, and the inlet of the conveying pump are connected in sequence by flanges.

[0044] The compressed air in the workshop is divided into two paths: one path leads to ejector 7, which provides a negative pressure source for the entire system; the other path is divided into two branches: one branch supplies the pulse bag filter for dust removal; the other branch supplies the pneumatic conveying pump for material backfeeding.

[0045] The system's startup sequence is as follows: ejector 7 starts → dust collection system establishes negative pressure → rotary feeder valve starts → pneumatic conveying pump starts. When the level gauge in hopper 16 detects that the material level has reached the high level, the control system automatically starts the rotary feeder valve and pneumatic conveying pump to begin the reverse feeding operation. During the reverse feeding process, the vibrating motor operates intermittently to assist in material feeding. When the material level drops to the low level, the reverse feeding system automatically stops, waiting for the next collection. The pulse cleaning system automatically performs pulse cleaning based on the set time interval or the pressure difference before and after filter chamber 15.

[0046] This negative pressure dust collection device can conveniently collect scattered powder materials. It is simple to operate, saves time and labor, and avoids dust generated by manual handling.

[0047] The beneficial effects of the technical solution in this application include: This application, with its unique negative air pressure generator and rotary multi-stage dust removal technology, not only has a simple structure and convenient operation, but also has a significant dust removal effect.

[0048] This application integrates negative pressure dust removal, material collection, impurity separation, and precise backfeeding functions to achieve closed-loop management of the entire process of "dispersion-recovery-reuse" of the covering material. The development of this device can not only reduce dust pollution and improve material utilization, but also reduce manual intervention, which is in line with the development trend of "greening, intelligence, and reduced manpower" in the aluminum electrolysis industry, and has significant economic and environmental value.

[0049] The device described in this application has a compact structure and is easy to install. It can significantly recover materials such as alumina in the electrolysis workshop and effectively solve the problem of dust pollution. It performs all-round vacuum cleaning of the electrolysis workshop, including the top of the equipment, thereby avoiding secondary pollution caused by dust disturbance.

[0050] Note that, unless otherwise explicitly stated, all features disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by alternative features for achieving the same, equivalent, or similar purpose. Therefore, unless explicitly stated otherwise, each disclosed feature is merely one example of a set of equivalent or similar features. Where used, "further," "preferably," "even further," and "more preferably" are simply starting points for describing another embodiment based on the foregoing embodiments, the combination of which with the foregoing embodiments constitutes the complete configuration of another embodiment. Any combination of several "further," "preferably," "even further," or "more preferably" settings following the same embodiment constitutes yet another embodiment.

[0051] In the implementation of functions and steps, the corresponding functions and steps in the various embodiments may occur in a different order than those shown. For example, two consecutive functions and steps may actually be executed or implemented substantially in parallel, and they may sometimes be executed or implemented in reverse order, depending on the functions involved.

[0052] Although this application has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of this application fall within the scope of protection claimed in this application.

Claims

1. A negative pressure dust collection device for aluminum electrolysis, characterized in that, include: The system includes a mobile chassis, a negative pressure dust collection system, a material separation module, and a directional conveying mechanism. The negative pressure dust collection system includes an ejector, the material collection and separation module includes a vacuum drum, and the directional conveying mechanism includes a pneumatic conveying chute or a screw conveyor. The vacuum cylinder is mounted on the upper part of the mobile chassis. The bottom of the vacuum cylinder is provided with a discharge port, and the upper end of the vacuum cylinder is provided with a vent. The vent is connected to the ejector through a flange. The ejector is provided with an air inlet at one end, and the air inlet is connected to a compressed air pipeline via a quick connector. The vacuum cylinder has a suction port in the upper part of its body, and the suction port is connected to a suction hose via a flange. The material separation module is installed in the vacuum drum and includes a settling buffer chamber, a cyclone separator, a filter chamber, and a material collection hopper. The directional conveying mechanism includes a feeding device and a pneumatic conveying system.

2. The negative pressure dust collection device for aluminum electrolysis according to claim 1, characterized in that, The settling buffer silo is equipped with a suction port, which is connected to a suction hose via a flange. The shell of the settling buffer silo is composed of a conical cylinder that is larger at the top and smaller at the bottom, and a manual slide valve or an electric ash discharge valve is provided at the bottom of the silo.

3. The negative pressure dust collection device for aluminum electrolysis according to claim 2, characterized in that, The cyclone separator is located after the settling buffer chamber. Its top is connected to the air outlet of the settling buffer chamber via a tangential air inlet pipe. The lower part is a conical constriction hopper with an exhaust pipe at the center. The upper part of the cyclone separator body is a vertical cylinder with a spiral top plate at the top, forming a narrow annular channel with the outer wall of the exhaust pipe to guide the airflow downwards. The bottom end of the conical constriction hopper is connected to an ash discharge port, which is connected to the collection hopper via a flange.

4. The negative pressure dust collection device for aluminum electrolysis according to claim 3, characterized in that, The filter chamber is connected after the exhaust pipe of the cyclone separator. The filter chamber is a sealed chamber with a pulse jet bag filter suspended inside. The clean air zone of the filter chamber is connected to the air vent.

5. The negative pressure dust collection device for aluminum electrolysis according to claim 4, characterized in that, The collecting hopper is located directly below the cyclone separator and is a hopper with a conical bottom. The side wall of the collecting hopper is provided with an observation window, and the bottom outlet of the collecting hopper is connected to the discharge port.

6. The negative pressure dust collection device for aluminum electrolysis according to claim 5, characterized in that, The feeding device is located at the discharge port and is equipped with a rotary feeding valve; The pneumatic conveying system includes a power source, a conveying pump, and a conveying pipeline.

7. The negative pressure dust collection device for aluminum electrolysis according to claim 6, characterized in that, The settling buffer chamber, cyclone separator, and filter chamber are rigidly connected by flanges and gaskets to form an integral structure, which is installed on the mobile chassis. The hopper outlet, rotary feed valve inlet, and conveying pump inlet are connected in sequence by flanges.

8. The negative pressure dust collection device for aluminum electrolysis according to claim 1, characterized in that, The mobile chassis is an explosion-proof electric tracked chassis, or the mobile chassis is equipped with four rotatable wheels and a locking device at the bottom. A non-slip, insulated handle is installed on one side of the chassis.

9. The negative pressure dust collection device for aluminum electrolysis according to claim 1, characterized in that, The mobile chassis is equipped with a liftable support, and the vacuum cylinder is mounted on the liftable support. The liftable support includes: a base frame, a top platform, a scissor arm assembly, and a drive system. The base frame is fixed to the mobile chassis; The top plate platform is rigidly fixed to the bottom end of the vacuum cylinder; The bottom end of the scissor arm assembly is connected to two parallel guide rails on the base frame via rollers or sliders, and the top end of the scissor arm assembly is connected to the top plate platform via rollers or sliders. The drive system is an electric push rod. The cylinder end of the electric push rod is mounted on the base frame via a hinge, and the push rod end of the electric push rod is connected to the bottom roller bracket of the lowest scissor arm assembly via a hinge.

10. The negative pressure dust collection device for aluminum electrolysis according to claim 1, characterized in that, The other end of the ejector is provided with an exhaust port, which is connected to the negative pressure port of the electrolytic cell exhaust.

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