CN219621275U - Aluminum oxide continuous blanking device of aluminum electrolysis cell - Google Patents
Aluminum oxide continuous blanking device of aluminum electrolysis cell Download PDFInfo
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- CN219621275U CN219621275U CN202320724013.8U CN202320724013U CN219621275U CN 219621275 U CN219621275 U CN 219621275U CN 202320724013 U CN202320724013 U CN 202320724013U CN 219621275 U CN219621275 U CN 219621275U
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Abstract
The utility model discloses an aluminum oxide continuous blanking device of an aluminum electrolysis cell, which aims to solve the technical problems that the existing blanking device of the aluminum electrolysis cell is excessively and difficultly completely dissolved in a short time, the blanking precision is low, the service life of the electrolysis cell is influenced, and the power consumption of the electrolysis cell is increased. The spiral discharging mechanism comprises a shell and a spiral conveying assembly, wherein the transmission mechanism comprises a support frame and a transmission shaft, the shell of the spiral discharging mechanism is fixedly connected with the bottom of the support frame of the transmission mechanism, and the spiral conveying assembly is positioned in the shell of the spiral discharging mechanism and is fixedly connected with the transmission shaft; the bottom discharging mechanism comprises a discharging chassis and rotating blades. The beneficial technical effects of the utility model are as follows: continuous blanking prevents excessive instant blanking from being difficult to dissolve, has high control precision and is beneficial to protecting the aluminum electrolysis cell.
Description
Technical Field
The utility model relates to the technical field of electrolytic aluminum, in particular to an aluminum oxide continuous blanking device of an aluminum electrolysis cell.
Background
At present, alumina powder is intermittently, regularly and quantitatively added into an electrolytic tank through a constant-volume blanking device in the electrolytic tank alumina blanking of a domestic electrolytic aluminum factory, the constant-volume blanking device comprises a space with a certain volume and an upper cone and a lower cone, under the existing electrolytic tank operation mode, the upper cone is opened to enable alumina to enter the constant-volume blanking device from an alumina bin, and then the upper cone is closed to open the lower cone to enable all alumina in the constant-volume blanking device to enter the electrolytic tank. The aluminum oxide is fed for 1 time through the constant-volume feeding device at intervals of about 2-2.5 minutes, the feeding amount is about 1.2-1.8 liters, and as the aluminum oxide powder is fed into a molten pool of the electrolytic tank in a short time (5-10 seconds), the aluminum oxide is fed relatively more in a short time, and at the current time point of feeding, the aluminum oxide is slowly dissolved in molten electrolyte, a part of aluminum oxide is not dissolved, aluminum oxide precipitates are formed at the bottom of the electrolytic tank, and the bottom of the tank is scarred for a long time, so that the horizontal current in the electrolytic tank is increased, the current efficiency is influenced, and the service life of the tank is influenced. In addition, the blanking amount of the constant-volume blanking device is unstable, and the blanking amount is 50% -60%, so that an anode effect is easy to generate, the running instability of the electrolytic tank is increased, the ledge is easy to melt, the service life of the electrolytic tank is shortened, and the energy consumption per ton of aluminum is increased. Therefore, from the aspects of optimizing production process and further electrolysis energy saving, it is very practical to realize continuous alumina feeding of the electrolytic cell in the operation of the existing electrolytic cell.
Disclosure of Invention
The utility model provides an aluminum oxide continuous blanking device of an aluminum electrolysis cell, which aims to solve the technical problems that the existing blanking device of the aluminum electrolysis cell is excessively and difficultly dissolved completely in a short time, the blanking precision is low, the service life of the electrolysis cell is influenced, and the power consumption of the electrolysis cell is increased.
In order to solve the technical problems, the utility model adopts the following technical scheme:
an aluminum oxide continuous discharging device of an aluminum electrolysis cell is designed and is connected with an aluminum oxide bin in a matching way, and comprises a driving mechanism, a transmission mechanism, a spiral discharging mechanism, a bottom discharging mechanism and a control system, wherein,
the spiral discharging mechanism is arranged at the bottom of the alumina bin, the transmission mechanism is connected between the driving mechanism and the spiral discharging mechanism, and the bottom discharging mechanism is arranged at the bottom of the spiral discharging mechanism;
the spiral blanking mechanism comprises a cylindrical shell, a spiral conveying assembly, a feed inlet and a discharge outlet, wherein the feed inlet is positioned at the front end part of the shell, the discharge outlet is positioned at the tail end part of the shell, and the spiral conveying assembly is provided with a short-pitch spiral structure and is used for conveying alumina powder and controlling flow;
the transmission mechanism comprises a support frame and a transmission shaft, the shell of the spiral blanking mechanism is fixedly connected with the bottom of the support frame of the transmission mechanism, and the spiral conveying component is positioned in the shell of the spiral blanking mechanism and connected with the transmission shaft.
Further, bottom discharge mechanism includes the ejection of compact chassis, and the ejection of compact chassis is located the below of spiral unloading mechanism's discharge gate, has the ejection of compact clearance between the shell of ejection of compact chassis and spiral unloading mechanism.
Further, the bottom discharging mechanism further comprises a rotating blade, the rotating blade is located above the discharging chassis, the rotating blade is a radial guide blade from the center to the outer circumference, and the rotating blade is fixedly or detachably connected with a transmission shaft of the transmission mechanism.
Further, the discharging chassis of the bottom discharging mechanism is arc-shaped, the inner arc surface of the discharging chassis faces upwards and is connected to the shell of the spiral discharging mechanism, the gap between the inner arc surface of the spiral blade and the discharging chassis is 0.1-10mm, the gap between the spiral blade and the lower edge of the discharging hole is 0.1-10mm, and the gap between the lower edge of the discharging hole and the upper edge of the discharging chassis is 1-30mm.
Further, be provided with stirring vane on the transmission shaft, stirring vane is located spiral unloading mechanism's shell top and shell inside, and this stirring vane sets up and distributes along the transmission shaft circumference along the transmission shaft interval from top to bottom.
Further, a rotation detection device (a proximity switch or an encoder) is arranged on the transmission shaft, the rotation of the transmission shaft is monitored, and when the rotation speed of the transmission shaft is abnormal (higher, lower and stopped), an alarm is automatically given.
Further, the driving mechanism comprises a speed-regulating speed-reducing motor with diamagnetic interference and high temperature resistance, the rotating speed is 0.5-100 rpm, the transmission power is 0.15-0.8 KW, and the speed-reducing ratio of the matched speed-reducing motor is 1:30-1:150.
Further, the feed inlet is of a funnel-shaped structure with a wide upper part and a narrow lower part, and the screw pitch of the short-screw-pitch screw structure is in the range of 20-70mm.
Further, the support frame of drive mechanism includes two at least bracing pieces, and the bracing piece sets up in the periphery side of transmission shaft, and the bracing piece top is provided with the roof, and actuating mechanism installs on this roof, and the top at spiral unloading mechanism is fixed to the bracing piece bottom.
Further, still include unloading elephant trunk subassembly, unloading elephant trunk subassembly includes ejection of compact slide way and ejection of compact shrink pipe, and the ejection of compact slide way corresponds with the discharge gate of spiral unloading mechanism and is connected, and ejection of compact shrink pipe is pegged graft on ejection of compact slide way, and the pipe diameter of ejection of compact shrink pipe diminishes gradually. When the continuous blanking amount of the alumina is small flow, the outlet section of the blanking chute assembly is designed and manufactured into a shrinkage tube so as to ensure that larger dust is not generated, and the strands are gathered and not dispersed when the alumina flows out, so that the dust is less.
Further, the discharging shrinkage tube is a circular tube with the diameter of 15-50 mm or a tube with the upper arc-shaped lower part of 30-120 degrees in a V shape.
Compared with the prior art, the utility model has the beneficial technical effects that:
1. the utility model solves the problems of larger one-time blanking amount of alumina in the existing constant-volume blanking device, formation of alumina precipitation scab at the bottom of the electrolytic tank and anode effect of the electrolytic tank by regularly controlling the flow of alumina powder by arranging the spiral blanking device and continuously blanking at a small flow in 1-2 minutes.
2. The utility model has higher blanking precision, because the device is provided with the short-pitch spiral, the flow of alumina can be well controlled, the bottom discharging device is provided with the alumina guide vane with involute blades, and the smooth discharge of alumina can be ensured under different rotating speeds, thereby improving the blanking precision of the continuous blanking device, and the precision reaches +/-5 percent.
3. The control system can utilize the existing groove control machine, realize the adjustment and the switching of the continuous alumina blanking quantity under different states after adding the conversion device, complete the alumina concentration control and the abnormal condition treatment, and has convenient implementation and high reliability.
4. According to the utility model, the alumina is continuously fed, so that the alumina is fed more uniformly, and is rapidly and uniformly dissolved in the electrolyte; the dissolution and heat absorption of the alumina in the electrolyte are reduced, the partial tank temperature reduction is greatly reduced, the dissolution speed of the alumina of the electrolyte is stabilized, the formation of furnace bottom precipitation is avoided, the horizontal current is reduced, the current efficiency is improved, and the electrolytic aluminum production is stabilized.
Drawings
FIG. 1 is a schematic installation view of a continuous alumina blanking device for an aluminum electrolysis cell according to the present utility model.
Fig. 2 is a first sectional view of the structure at A-A in fig. 1.
FIG. 3 is a second cross-sectional view of the structure of FIG. 1 at A-A.
FIG. 4 is a schematic structural view of an alumina continuous blanking device of an aluminum electrolysis cell of the present utility model.
Fig. 5 is a schematic structural view of a bottom discharge mechanism in the present utility model.
Fig. 6 is a schematic top view of the bottom discharge mechanism of the present utility model.
In the figure, an alumina bin 1, a driving mechanism 2, a transmission mechanism 3, a spiral blanking mechanism 4, a bottom discharging mechanism 5, an alumina bin discharging vertical pipe 6, a discharging chute 7, a discharging shrinkage pipe 8 and stirring blades 9;
a drive shaft 31, a support rod 32, and a top plate 33;
a feed port 41, a screw conveyor assembly 42, a housing 43, a stepped portion 44;
the device comprises a discharging chassis 51, a connecting rod 52, side bolts 53, threads 54, rotating blades 55 and a discharging gap 56.
Detailed Description
The following examples are given to illustrate the utility model in detail, but are not intended to limit the scope of the utility model in any way.
Example 1: an alumina continuous blanking device of an aluminum electrolysis cell, referring to fig. 1, comprises a driving mechanism 2, a transmission mechanism 3, a spiral blanking mechanism 4, a bottom discharging mechanism 5 and a control system. The aluminum oxide continuous discharging device of the aluminum electrolysis cell is arranged in an aluminum oxide bin, wherein a driving mechanism 2 is arranged at the top of the aluminum oxide bin 1, a spiral discharging mechanism 4 is arranged at the bottom of the aluminum oxide bin 1, a transmission mechanism 3 is connected between the driving mechanism 2 and the spiral discharging mechanism 4, and a bottom discharging mechanism 5 is arranged at the bottom of the spiral discharging mechanism 4.
The spiral blanking mechanism 4 comprises a spiral conveying assembly 42 and a shell 43, and referring to fig. 4, the transmission mechanism 3 comprises a supporting frame and a transmission shaft 31, the supporting frame comprises three supporting rods 32 which are uniformly distributed along the peripheral side of the transmission shaft, a top plate 33 is arranged at the top of each supporting rod 32, the driving mechanism 2 is arranged on the top plate 33, and the bottom of each supporting rod 32 is fixed at the top end of the spiral blanking mechanism 4.
The shell 43 of the spiral blanking mechanism 4 is fixedly connected with the bottom of the supporting frame of the transmission mechanism 3, and the spiral conveying component 42 is positioned in the shell 43 of the spiral blanking mechanism and is fixedly connected with the transmission shaft 31. The screw conveying component is of a short-pitch screw structure with a screw pitch of 20-70mm and is used for conveying the alumina powder and controlling the flow rate. The top of the spiral blanking mechanism 4 is provided with a feeding hole 41 which is of a funnel-shaped structure with a wide upper part and a narrow lower part, so that the alumina powder in the alumina bin can well enter the spiral blanking device. The outside bottom of feed inlet 41 is provided with circumference step portion 44 for with spiral unloading mechanism joint in the bottom in alumina silo.
The structure of the bottom discharging mechanism 5 is shown in fig. 5 and 6, and comprises a discharging chassis 51 and a rotating blade 55, wherein the rotating center of the rotating blade 55 is fixedly connected with a transmission shaft 31 of a transmission mechanism, the discharging chassis 51 is positioned below the rotating blade 55 and is fixedly connected with the transmission shaft 31 of the transmission mechanism through threads 54, and a discharging gap is formed between the discharging chassis and a shell of the spiral discharging mechanism. The discharge chassis 51 is mounted on the housing 43 of the screw discharging mechanism 4 by 4 connecting rods 52 and is fixed by side bolts 53.
The rotating blades 55 of the bottom discharging mechanism 5 are involute guide blades moving from the center to the outer circle and are detachably connected with a transmission shaft of the transmission mechanism, and a discharging chassis of the bottom discharging mechanism is detachably connected with the transmission shaft of the transmission mechanism. The discharging chassis 51 of the bottom discharging mechanism 5 is in a cambered surface shape, and the inner cambered surface faces upwards and is connected to a transmission shaft of the transmission mechanism. The discharge chassis 51 and the casing 43 of the screw blanking mechanism 4 are provided with a certain discharge gap 56, and when the rotary blade 55 rotates along with the transmission shaft, alumina powder is output outwards from the discharge gap 56. The bottom discharging mechanism 5 plays a role of discharging a certain amount of alumina powder in unit time, the amount of the discharged alumina powder is related to the number of the involute rotary blades 55 and the discharging rotating speed, the number of the involute rotary blades is high, the discharging rotating speed is high, the weight of the discharged alumina powder is heavy, otherwise, the number of the involute rotary blades is small, the discharging rotating speed is low, and the weight of the discharged alumina powder is light.
The spiral discharging mechanism 4 outside is provided with alumina silo ejection of compact standpipe 6 and ejection of compact chute 7, the outside at spiral discharging mechanism 4 is installed through the fixed block in alumina silo ejection of compact standpipe 6, ejection of compact chute 7 connects in the bottom of alumina silo ejection of compact standpipe 6 and obliquely set up downwards, the below of ejection of compact chute 7 is connected with ejection of compact shrink tube 8, the pipe diameter of ejection of compact shrink tube 8 diminishes gradually, the diameter of terminal is around 15-50 mm, ejection of compact shrink tube 8 is in the same place with ejection of compact chute 7 through the pegging graft form with the screw bolt, the terminal of ejection of compact shrink tube 8 can be the pipe shape as shown in fig. 2, also can be the pipe as shown in fig. 3 adds two kinds of structures of 30-120 degree angle "V" shape, the shaping of guaranteeing the alumina when flowing out gathers non-dispersing, the dust is few.
The transmission shaft component, the spiral blanking mechanism and the bottom discharging mechanism are all made of anti-magnetic 304 stainless steel materials. And the clearance between the spiral blade of the spiral feeder and the outer cylinder is controlled to be 3-4 mm in the diameter direction, and the clearance between the involute blade of the discharging device and the lower end surface of the chassis and the lower end surface of the outer cylinder of the spiral feeder is controlled to be 2-3 mm.
In order to improve the blanking precision of the continuous blanking device, 3 stirring blades 9 are arranged at equal parts of the circumference at positions 50mm away from a feed inlet at the upper part of the spiral blanking device and positions on a transmission shaft part at intervals of 50 mm. The screw pitch of the screw blade of the blanking device is designed to be a short-pitch screw with the screw pitch of 20-70mm, so that the self-flow of alumina can be controlled, and alumina materials can be well conveyed regularly through the screw blade. The rotating blades of the bottom discharging mechanism are designed to be alumina guide plates with 3-8 involute blades evenly distributed on the circumference, so that smooth discharge of alumina can be ensured under different rotating speeds, and the discharging precision of the continuous discharging device is obviously improved and can reach +/-5%.
In order to ensure the reliability and stability of the continuous blanking device transmission and blanking, a driving mechanism adopts an anti-magnetic interference high-temperature-resistant speed-regulating speed-reducing motor, the rotating speed is 0.5-100 rpm, the transmission power is 0.15-0.8 KW, the speed-reducing ratio of the matched speed-reducing motor is 1:30-1:150, and the continuous blanking amount of alumina is regulated within the range of 0-3kg/min.
The existing constant volume blanking device is replaced by the aluminum electrolysis cell aluminum oxide continuous blanking device in the embodiment 1 by removing the constant volume blanking device used in the existing aluminum oxide bin.
The original alumina blanking adopts a constant volume device intermittent blanking mode, and a cell control machine (an electric control system of an aluminum electrolysis cell) calculates the slope of the change of cell resistance by measuring the cell voltage and the series current of the electrolysis cell, and judges the change of the alumina concentration in electrolyte in the electrolysis cell. The total blanking amount in different state periods is adjusted by changing the blanking state time length of 'excessive', 'normal', 'insufficient', and the like, so that the alumina concentration control is realized. The special treatment of short-time repeated material blocking and stopping during the effect is realized through special blanking states such as effect treatment, material blocking and the like.
After continuous blanking of alumina, the existing groove control machine is modified, state signals such as excessive, normal, underload, effect processing, blocking and the like in the constant volume device mode are converted into analog signals or digital signals, and the blanking device is controlled to continuously operate at corresponding set rotating speeds so as to realize the conversion of the blanking amount of alumina in different states and complete the control of the concentration of alumina and abnormal states. In order to facilitate the improvement of the existing control system, a first-stage conversion device can be added under the condition that the existing slot control machine is unchanged, and the output signal of the original slot control machine is converted into a control signal suitable for the continuous blanking device.
And a rotation detection device (a proximity switch or an encoder) is further arranged at the top end of the transmission shaft, so that the rotation of the transmission shaft is monitored, and when the rotating speed of the transmission shaft is abnormal (higher, lower and stopped), an automatic alarm is given out, and timely maintenance treatment is reminded. Abnormal alumina blanking or blanking stopping caused by blanking faults are avoided, and influence is caused on electrolytic production.
While the present utility model has been described in detail with reference to the drawings and the embodiments, those skilled in the art will understand that various specific parameters in the above embodiments may be changed without departing from the spirit of the utility model, and a plurality of specific embodiments are common variation ranges of the present utility model, and will not be described in detail herein.
Claims (10)
1. The aluminum oxide continuous discharging device of the aluminum electrolysis cell is connected with an aluminum oxide bin in a matching way and is characterized by comprising a driving mechanism, a transmission mechanism, a spiral discharging mechanism, a bottom discharging mechanism and a control system, wherein the spiral discharging mechanism is arranged at the bottom of the aluminum oxide bin, the transmission mechanism is connected between the driving mechanism and the spiral discharging mechanism, and the bottom discharging mechanism is arranged at the bottom of the spiral discharging mechanism; the spiral blanking mechanism comprises a cylindrical shell, a spiral conveying assembly, a feed inlet and a discharge outlet, wherein the feed inlet is positioned at the front end part of the shell, the discharge outlet is positioned at the tail end part of the shell, and the spiral conveying assembly is provided with a short-pitch spiral structure; the transmission mechanism comprises a support frame and a transmission shaft, the shell of the spiral blanking mechanism is fixedly connected with the bottom of the support frame of the transmission mechanism, and the spiral conveying component is positioned in the shell of the spiral blanking mechanism and connected with the transmission shaft.
2. The continuous alumina blanking device of the aluminum electrolysis cell according to claim 1, wherein the bottom discharging mechanism comprises a discharging chassis, the discharging chassis is positioned below a discharging hole of the spiral blanking mechanism, and a discharging gap is arranged between the discharging chassis and a shell of the spiral blanking mechanism.
3. The continuous alumina blanking device of the aluminum electrolysis cell according to claim 2, wherein the bottom discharging mechanism further comprises a rotary blade, the rotary blade is located above the discharging chassis, the rotary blade is a guide blade with a radial shape from the center to the outer circumference, and the rotary blade is fixedly or detachably connected with a transmission shaft of the transmission mechanism.
4. The aluminum oxide continuous blanking device of the aluminum electrolysis cell according to claim 3, wherein the discharging chassis of the bottom discharging mechanism is arc-shaped, and the inner arc surface of the discharging chassis faces upwards and is connected to the shell of the spiral blanking mechanism; the clearance between the rotating blades and the intrados of the discharge chassis is 0.1-10mm, the clearance between the rotating blades and the lower edge of the discharge port is 0.1-10mm, and the clearance between the lower edge of the discharge port and the upper edge of the discharge chassis is 1-30mm.
5. The aluminum oxide continuous blanking device of the aluminum electrolysis cell according to claim 1, wherein stirring blades are arranged on the transmission shaft, the stirring blades are positioned above the shell of the spiral blanking mechanism and inside the shell, and the stirring blades are arranged at intervals up and down along the transmission shaft and are distributed along the circumferential direction of the transmission shaft.
6. The aluminum oxide continuous blanking device of the aluminum electrolysis cell according to claim 1, wherein the driving mechanism comprises a speed-regulating speed-reducing motor with anti-magnetic interference and high temperature resistance, the rotating speed is 0.5-100 rpm, the transmission power is 0.15-0.8 KW, the reduction ratio of the matched speed-reducing motor is 1:30-1:150, and a proximity switch or an encoder for monitoring the rotating speed of the transmission shaft is further arranged on the transmission shaft.
7. The continuous alumina discharging device for an aluminum electrolysis cell according to claim 1, wherein the feeding port is of a funnel-shaped structure with a wide upper part and a narrow lower part, and the pitch of the short pitch spiral structure is 20-70mm.
8. The continuous alumina blanking device of the aluminum electrolysis cell according to claim 1, wherein the supporting frame of the transmission mechanism comprises at least two supporting rods, the supporting rods are arranged on the periphery side of the transmission shaft, the tops of the supporting rods are arranged on the top plate, the driving mechanism is arranged at the upper end of the top plate, and the bottoms of the supporting rods are fixed at the top end of the spiral blanking mechanism.
9. The aluminum oxide continuous blanking device of an aluminum electrolysis cell according to claim 1, further comprising a blanking chute assembly, wherein the blanking chute assembly comprises a discharging chute and a discharging shrinkage tube, the discharging chute is correspondingly connected with a discharging port of the spiral blanking mechanism, and the discharging shrinkage tube is inserted into the discharging chute.
10. The alumina continuous blanking device of the aluminum electrolysis cell according to claim 9, wherein the discharging shrinkage tube is a circular tube with the diameter of 15-50 mm or a tube with the upper arc-shaped lower part of 30-120 degrees in a V shape.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320724013.8U CN219621275U (en) | 2023-04-04 | 2023-04-04 | Aluminum oxide continuous blanking device of aluminum electrolysis cell |
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| CN202320724013.8U CN219621275U (en) | 2023-04-04 | 2023-04-04 | Aluminum oxide continuous blanking device of aluminum electrolysis cell |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116240586A (en) * | 2023-04-04 | 2023-06-09 | 北京华索科技股份有限公司 | Aluminum oxide continuous blanking device and method for aluminum electrolysis cell |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116240586A (en) * | 2023-04-04 | 2023-06-09 | 北京华索科技股份有限公司 | Aluminum oxide continuous blanking device and method for aluminum electrolysis cell |
| CN116240586B (en) * | 2023-04-04 | 2023-11-10 | 北京华索科技股份有限公司 | Aluminum oxide continuous blanking device and method for aluminum electrolysis cell |
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