A high-purity aluminum production system

Abstract

The present invention discloses a high-purity aluminum production system, which includes a refined aluminum bath and a control device. The control device includes a control unit and a three-layer liquid depth measuring device. The control device is also used to control the three-layer liquid depth measuring device to measure the respective depths of the three-layer liquid in the refined aluminum bath during the refining process. The three-layer liquid depth measuring device is arranged above the refined aluminum bath and includes a probing mechanism and a camera mechanism. The control unit is electrically connected to the probing mechanism and is used to control the probing mechanism to probe into the refined aluminum bath and abut against the bottom of the refined aluminum bath, and then completely move it out of the refined aluminum bath, so that the probing mechanism adheres to the adherents in the three-layer liquid. After the probing mechanism moves out of the refined aluminum bath, the control unit controls the camera mechanism to take an image of the probing mechanism, so as to obtain the respective depths of the three-layer liquid in the refined aluminum bath through the image. The high-purity aluminum production system of the present invention can measure the three-layer liquid depth online, improve production efficiency, reduce energy consumption and ensure product quality.

Description

Technical Field

[0001] The present invention belongs to the technical field of refined aluminum, and particularly relates to a high-purity aluminum production system. Background Art

[0002] At present, the three-layer liquid refined aluminum electrolysis method is the main method for preparing high-purity aluminum (or refined aluminum). During electrolysis, there are three layers of liquid in the refined aluminum cell. The bottom layer is the anode and the anode conductor, and the anode conductor is composed of the original aluminum to be refined and the weighting agent Cu. The middle layer is the electrolyte, and its density is between that of the anode alloy and aluminum. The upper layer is the high-purity aluminum obtained by refining and the cathode. The refined aluminum cell body is provided with a raw material inlet for adding raw materials to the bottom layer, an electrolyte inlet communicating with the middle layer, and a pure aluminum outlet communicating with the upper layer.

[0003] When producing high-purity aluminum by the electrolysis method, it is necessary to strictly control the timing of adding the original aluminum and the timing of discharging the refined aluminum. That is, when there is less raw material, it is necessary to supplement the aluminum ingot raw material, and when there is too much finished refined aluminum, it is necessary to discharge the aluminum. In addition, when there is less electrolyte, it is necessary to supplement the electrolyte. At present, the three-layer liquid electrolysis process generally measures the depth of each layer after the overall power-off after running for a period of time to determine whether it is necessary to add the original aluminum and the electrolyte, or whether it is necessary to discharge the aluminum. The power-off not only affects the production efficiency, but also requires heating when restarting, resulting in increased energy consumption. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a high-purity aluminum production system aiming at the above deficiencies in the prior art. This system can measure the depth of the three-layer liquid online,

[0005] improve the production efficiency, reduce the energy consumption and ensure the product quality.

[0006] The present invention provides a high-purity aluminum production system, including a refined aluminum cell and a control device. The refined aluminum cell contains three layers of liquid. The control device is used to control the refined aluminum cell to perform the refining process. The control device includes a control unit and a three-layer liquid depth measuring device. The control device is also used to control the three-layer liquid depth measuring device to measure the depth of each layer of the three-layer liquid in the refined aluminum cell during the refining process. The three-layer liquid depth measuring device is arranged above the refined aluminum cell and includes a probing mechanism and a camera mechanism. The control unit is electrically connected to the probing mechanism and is used to control the probing mechanism to probe into the refined aluminum cell and abut against the bottom of the refined aluminum cell, and then completely move it out of the refined aluminum cell, so that the probing mechanism adheres to the adherents in the three-layer liquid. The control unit is also electrically connected to the camera mechanism and is used to control the camera mechanism to take an image of the probing mechanism after the probing mechanism moves out of the refined aluminum cell, so as to obtain the depth of each layer of the three-layer liquid in the refined aluminum cell through the image.

[0007] Preferably, a first position sensor is provided on the probing mechanism for sensing the position of the probing mechanism. The control unit includes a timing module. When the first position sensor senses that the probing mechanism is in contact with the bottom of the refined aluminum bath, it sends a depth measurement signal to the control unit. After receiving the depth measurement signal, the control unit starts the timing module. After the timing module times to reach the first set time, the control unit controls the probing mechanism to completely move out of the refined aluminum bath. When the first position sensor senses that the probing mechanism is in the position of completely moving out of the refined aluminum bath, it sends a shooting signal to the control unit. After receiving the shooting signal, the control unit controls the imaging mechanism to shoot an image of the probing mechanism.

[0008] Preferably, the probing mechanism includes a probing driving member and an insulating rod. The probing driving member is electrically connected to the control unit and is used to drive the insulating rod to descend into the refined aluminum bath and ascend out of the refined aluminum bath under the control of the control unit.

[0009] Preferably, the three-layer liquid depth measuring device further includes an intensifying screen. The intensifying screen is arranged above the refined aluminum bath. The control unit controls the probing driving member to drive the insulating rod to ascend out of the refined aluminum bath and makes the lower part of the insulating rod with adhered matter correspond to the position of the intensifying screen. At this time, the imaging mechanism and the intensifying screen are respectively on both sides of the insulating rod. The intensifying screen is used to improve the contrast of the image captured by the imaging mechanism when the imaging mechanism shoots the lower part of the insulating rod.

[0010] Preferably, the control device further includes a temperature measuring device and a temperature regulating device. The control device is also used to control the temperature measuring device to sense the current temperature of each of the three-layer liquids in the refined aluminum bath during the refining process; and, to control the temperature regulating device to adjust the temperature of each of the three-layer liquids in the refined aluminum bath during the refining process. The control unit is also electrically connected to the temperature measuring device and the temperature regulating device and is used to obtain the temperature difference of each of the three-layer liquids according to the set temperature and the current temperature of each of the three-layer liquids, and obtain the required temperature adjustment amount of each of the three-layer liquids according to the temperature difference and the depth of each of the three-layer liquids, and then control the output of the temperature regulating device according to the required temperature adjustment amount of each of the three-layer liquids.

[0011] Preferably, the temperature measuring device is movably connected above the refined aluminum bath in the vertical direction. The control unit is used to drive the detection end of the temperature measuring device to descend into the refined aluminum bath to obtain the current temperature of each of the three-layer liquids in the refined aluminum bath.

[0012] Preferably, the control device further includes a cathode height control device, which includes a cathode lifting driving member and a cathode rod. The bottom end of the cathode rod is immersed in the upper layer liquid in the refined aluminum bath. The control unit includes an acquisition module, which is used to acquire the real-time depth of the cathode rod immersed in the upper layer liquid in the refined aluminum bath every second set time interval / after the aluminum addition step is completed / after the aluminum tapping step is completed. The control unit is also electrically connected to the cathode lifting driving member, and is used to determine whether the real-time depth of the cathode rod immersed in the upper layer liquid is within the set range. If it is not within the set range, the cathode lifting driving member is controlled to drive the cathode rod to lift and lower to adjust its current height until the real-time depth of the cathode rod immersed in the upper layer liquid is within the set range.

[0013] Preferably, the control unit further includes a timing module. The control unit is also used to receive a detection trigger signal triggered after the refined aluminum bath performs the aluminum addition operation / aluminum tapping operation, and is used to send a control instruction to the acquisition module when receiving the detection trigger signal / when the timing module counts the second set time, driving it to acquire the real-time depth of the cathode rod immersed in the upper layer liquid in the refined aluminum bath.

[0014] Preferably, the control device further includes a pole voltage drop measuring device, which is used to acquire the pole voltage drop between the upper layer liquid and the lower layer liquid in the refined aluminum bath during the refining process. The pole voltage drop measuring device includes a cathode probe, an anode probe and an anode probe driving member. The cathode probe is electrically connected to the cathode rod to be electrically connected to the upper layer liquid in the refined aluminum bath through the cathode rod. The anode probe driving member is connected to the anode probe and is used to drive the anode probe to lift and lower so that the anode probe contacts the lower layer liquid in the refined aluminum bath. The control unit is also electrically connected to the cathode probe and the anode probe respectively, and is used to acquire the pole voltage drop between the upper layer liquid and the lower layer liquid in the refined aluminum bath when the anode probe contacts the lower layer liquid in the refined aluminum bath.

[0015] Preferably, a second position sensor is provided on the anode probe for sensing the position of the anode probe. When the second position sensor senses that the anode probe is in the position of contacting the lower layer liquid in the refined aluminum bath, it sends a pressure measuring signal to the control unit. After receiving the pressure measuring signal, the control unit measures the pole voltage drop between the upper layer liquid and the lower layer liquid in the refined aluminum bath. After the measurement is completed, the control unit controls the anode probe driving member to drive the anode probe to rise. When the second position sensor senses that the anode probe is in the reset position, it sends a reset signal to the control unit, and the control unit controls the anode probe driving member to stop driving.

[0016] Preferably, the refined aluminum bath includes a bath body, a cover door and an opening and closing driving member. The three-layer liquid is accommodated in the bath body. A feeding port is provided at the upper part of the bath body for adding primary aluminum into the bath body. The driving end of the opening and closing driving member is connected to the cover door. The control unit is electrically connected to the opening and closing driving member and is used to control the opening and closing driving member to drive the cover door to close and open the feeding port.

[0017] Preferably, the control device further includes a transportation unit, which is electrically connected to the control unit. After obtaining the respective depths of the three-layer liquid in the refined aluminum tank through the three-layer liquid depth measuring device, the control unit compares the actual depth of the lower-layer liquid with the set depth of the lower-layer liquid. And when the depth of the lower-layer liquid is lower than the set depth, the control unit controls the transportation unit to transport the primary aluminum to the feeding port. A position sensor is provided on the transportation unit, and an induction point is arranged at the feeding port. When the position sensor senses the induction point, it sends an aluminum addition signal to the control unit. After receiving the aluminum addition signal, the control unit sends a first control signal to control the opening and closing driving member to drive the cover door to open the feeding port. The control unit further includes a timing module, which is used to start timing when sending the first control signal, and sends a second control signal to control the opening and closing driving member to drive the cover door to close the feeding port after the timing duration reaches the feeding duration.

[0018] In the high-purity aluminum production system provided by the present invention, a three-layer liquid is contained in the refined aluminum tank 1, and the control device is used to control the refined aluminum tank 1 to perform the refining process. During the refining process, the depths of the three-layer liquid in the refined aluminum tank are automatically measured online through the three-layer liquid depth measuring device. Among them, the control unit makes the probing mechanism penetrate into the refined aluminum tank and abut against the bottom of the refined aluminum tank, and then completely move it out of the refined aluminum tank. That is, the probing mechanism directly contacts the bottom of the refined aluminum tank along the longitudinal direction. Practice shows that the adhesives of the three-layer liquid are different and will be divided into three layers with different colors on the probing mechanism. Specifically, the adhesive of the upper-layer liquid is formed by the solidification of the upper-layer liquid (refined aluminum) in the refined aluminum tank, the adhesive of the middle-layer liquid is formed by the solidification of the electrolyte in the refined aluminum tank plus a small amount of the upper-layer liquid (the adhesion of pure aluminum to the electrolyte is poor), and the adhesive of the lower-layer liquid is formed by the lower-layer liquid (primary aluminum and weighting agent) in the refined aluminum tank plus the electrolyte plus a small amount of the upper-layer liquid. The segments of these three layers of adhesives adhering to the probing mechanism correspond one-to-one to the depths of the three-layer liquid in the refined aluminum tank, so that the probing mechanism can display the depths of the three-layer liquid.

[0019] After that, using the fact that the colors of the adhesives are different, the control unit also controls the camera mechanism to take an image of the probing mechanism after it is moved out of the refined aluminum tank, so as to obtain the respective depths of the three-layer liquid in the refined aluminum tank through the image, that is, the depths of the upper-layer liquid, the middle-layer liquid and the lower-layer liquid in the refined aluminum tank, so that the operator can grasp the refining process in the refined aluminum tank at any time according to the depths of each layer, and judge whether it is necessary to add primary aluminum and electrolyte, or whether it is necessary to tap the aluminum. This system realizes the measurement of the depths of the upper-layer liquid, the middle-layer liquid and the lower-layer liquid in the refined aluminum tank without power-off. Compared with the power-off measurement situation, the working efficiency of this system is greatly improved, the energy consumption is reduced, and the reliability and accuracy of the measurement are also improved. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the high-purity aluminum production system according to an embodiment of the present invention;

[0021] Figure 2 It is a schematic structural diagram of a three-layer liquid depth measuring device in a high-purity aluminum production system according to an embodiment of the present invention;

[0022] Figure 3 It is a schematic diagram of the installation position of a three-layer liquid depth measuring device in a high-purity aluminum production system according to an embodiment of the present invention;

[0023] Figure 4 It is a schematic structural diagram of a temperature measuring device in a high-purity aluminum production system according to an embodiment of the present invention;

[0024] Figure 5 It is a schematic diagram of the installation position of a temperature measuring device in a high-purity aluminum production system according to an embodiment of the present invention;

[0025] Figure 6 It is a schematic structural diagram of a cathode height control device in a high-purity aluminum production system according to an embodiment of the present invention;

[0026] Figure 7 It is a schematic structural diagram of an anode hydraulic pressure drop measuring device in a high-purity aluminum production system according to an embodiment of the present invention;

[0027] Figure 8 It is a schematic diagram of the installation position of an anode hydraulic pressure drop measuring device in a high-purity aluminum production system according to an embodiment of the present invention;

[0028] Figure 9 It is a schematic diagram of the installation structure of a cover door in a high-purity aluminum production system according to an embodiment of the present invention;

[0029] Figure 10 It is a schematic diagram of the bottom structure of a cover door in a high-purity aluminum production system according to an embodiment of the present invention.

[0030] In the figure: 1, refined aluminum tank; 11, tank body; 111, feeding port; 112, annular protrusion; 12, cover door; 121, groove; 13, opening and closing driving member; 131, pushing member; 132, telescopic rod; 133, ear rod; 14, tank rack; 15, connecting rod;

[0031] 2, three-layer liquid depth measuring device; 21, probing mechanism; 211, probing driving member;

[0032] 2111, servo motor; 2112, screw rod; 2113, nut seat; 212, insulating rod; 2121, trough box; 213, vertical plate; 214, first flat plate; 215, second flat plate; 216, sliding shaft; 22, imaging mechanism; 23, intensifying screen;

[0033] 3, temperature measuring device; 31, temperature measuring mechanism; 32, temperature measuring driving member; 321, motor;

[0034] 322. Lead screw; 323. Connecting block; 324. Guide rod; 325. Mounting plate; 326. First ear plate; 327. Second ear plate;

[0035] 4. Cathode height control device; 41. Cathode lifting drive; 411. Lifting motor;

[0036] 412. Transmission mechanism; 4121. Lifting assembly; 4122. Bus bar clamp; 4123. Lifting shaft; 4124. Transmission shaft; 413. Bus bar; 42. Cathode rod; 43. Laser measuring component; 44. Cross beam;

[0037] 5. Polar voltage drop measuring device; 51. Cathode probe; 52. Anode probe; 53. Anode probe drive; 531. Drive motor; 532. Mounting part; 533. Lead screw; 534. Connecting piece; 535. Guide rod; 536. Lifting rod. Detailed implementation

[0038] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative work belong to the scope of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "upper", "lower", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of description and simplification, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0040] In the description of the present invention, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connection", "setting", "installation", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0042] Embodiment

[0043] As Figure 1As shown, the high-purity aluminum production system of this embodiment includes a refined aluminum tank 1 and a control device. There are three layers of liquid in the refined aluminum tank 1. The control device is used to control the refined aluminum tank 1 to perform the refining process. The control device includes a control unit and a three-layer liquid depth measuring device 2. The control device is also used to control the three-layer liquid depth measuring device 2 to measure the respective depths of the three layers of liquid in the refined aluminum tank 1 during the refining process.

[0044] As Figure 2 and Figure 3 shown, the three-layer liquid depth measuring device 2 is arranged above the refined aluminum tank 1 and includes a probing mechanism 21 and a camera mechanism 22; the control unit is electrically connected to the probing mechanism 21 and is used to control the probing mechanism 21 to probe into the refined aluminum tank 1 and abut against the bottom of the refined aluminum tank 1, and then completely move it out of the refined aluminum tank 1, so that the probing mechanism 21 adheres to the adhesives in the three-layer liquid; the control unit is also electrically connected to the camera mechanism 22 and is used to control the camera mechanism 22 to take an image of the probing mechanism 21 after the probing mechanism 21 moves out of the refined aluminum tank 1, so as to obtain the respective depths of the three layers of liquid in the refined aluminum tank 1 through the image.

[0045] In this high-purity aluminum production system, the depths of the three layers of liquid in the refined aluminum tank 1 are automatically measured online by the three-layer liquid depth measuring device 2. Practice shows that the adhesives of the three layers of liquid are different and will be divided into three layers with different colors on the probing mechanism 21. Specifically, the adhesive of the upper layer of liquid is formed by the solidification of the upper layer of liquid (refined aluminum) in the refined aluminum tank 1, the adhesive of the middle layer of liquid is formed by the solidification of the electrolyte in the refined aluminum tank 1 plus a small amount of the upper layer of liquid (the adhesion of pure aluminum to the electrolyte is poor), and the adhesive of the lower layer of liquid is formed by the lower layer of liquid (primary aluminum and weighting agent) in the refined aluminum tank 1 plus the electrolyte plus a small amount of the upper layer of liquid. The segments of these three layers of adhesives adhering to the probing mechanism 21 correspond one by one to the depths of the three layers of liquid in the refined aluminum tank 1, so that the probing mechanism 21 can display the depths of the three layers of liquid.

[0046] After that, taking advantage of the different colors shown by the adhesives, the control unit also controls the camera mechanism 22 to take an image of the probing mechanism 21 after it moves out of the refined aluminum tank 1, so as to obtain the respective depths of the three layers of liquid in the refined aluminum tank 1 through this image, that is, the depths of the upper layer of liquid, the middle layer of liquid, and the lower layer of liquid in the refined aluminum tank 1, so that the operator can grasp the refining process in the refined aluminum tank 1 at any time according to the depths of each layer and judge whether it is necessary to add primary aluminum and electrolyte, or whether it is necessary to tap the aluminum. This system realizes the measurement of the depths of the upper layer of liquid, the middle layer of liquid, and the lower layer of liquid in the refined aluminum tank 1 without power-off. Compared with the power-off measurement situation, the working efficiency of this system is greatly improved, the energy consumption is reduced, and the reliability and accuracy of the measurement are both improved.

[0047] In this embodiment, a first position sensor is provided on the probing mechanism 21 for sensing the position of the probing mechanism 21. The control unit includes a timing module. When the first position sensor senses that the probing mechanism 21 is in contact with the bottom of the refined aluminum bath 1, it sends a depth measurement signal to the control unit. After receiving the depth measurement signal, the control unit starts the timing module. After the timing module counts up to a first set time, the control unit controls the probing mechanism 21 to completely move out of the refined aluminum bath 1. When the first position sensor senses that the probing mechanism 21 is in the position of completely moving out of the refined aluminum bath 1, it sends a shooting signal to the control unit. After receiving the shooting signal, the control unit controls the imaging mechanism 22 to capture an image of the probing mechanism 21. This first set time is set according to the working conditions so that the adherents of the three-layer liquid can fully adhere to the probing mechanism 21.

[0048] In this embodiment, the probing mechanism 21 includes a probing driving member 211 and an insulating rod 212. The probing driving member 211 is electrically connected to the control unit and is used to drive the insulating rod 212 to descend into the refined aluminum bath 1 and ascend out of the refined aluminum bath 1 under the control of the control unit. In this embodiment, a bath rack 14 is provided above the bath body 11 of the refined aluminum bath 1. The probing driving member 211 is installed on the bath rack 14, and its driving end is connected to the insulating rod 212. The insulating rod 212 is made of SiC. Inserting the SiC insulating rod 212 into the three-layer liquid of refined aluminum will neither affect the electrolytic aluminum process nor contaminate the three-layer liquid. In this embodiment, the insulating rod 212 extends into the refined aluminum bath 1 through the feeding port 111.

[0049] In this embodiment, the three-layer liquid depth measuring device 2 further includes an intensifying screen 23. The intensifying screen 23 is arranged above the refined aluminum bath 1. The control unit controls the probing driving member 211 to drive the insulating rod 212 to ascend out of the refined aluminum bath 1 and makes the lower part of the insulating rod 212 with adherents correspond to the position of the intensifying screen 23. At this time, the imaging mechanism 22 and the intensifying screen 23 are respectively on both sides of the insulating rod 212. The installation position of the imaging mechanism 22 is as shown in the figure and can be installed on a separately provided support frame. The intensifying screen 23 is used to improve the contrast of the image captured by the imaging mechanism 22 when the lower part of the insulating rod 212 is photographed.

[0050] In this embodiment, the intensifying screen 23 is a black body used as a background board. When taking a photo, the insulating rod 212 taken out of the refined aluminum bath 1 is moved in front of the black body, so as to improve the contrast of each layer in the image. In other embodiments, other intensifying devices that can improve the contrast can also be selected to achieve this purpose.

[0051] In this embodiment, in order to enable the probing mechanism 21 to perform depth measurement multiple times, the insulating rod 212 needs to be properly cleaned. Therefore, the system is also provided with an annular cleaning brush on the tank rack 14. The control unit is further configured to, after the imaging mechanism 22 captures the lower part of the insulating rod 212, control the probing driving member 211 to drive the insulating rod 212 to move upward until the lower part of the insulating rod 212 passes through the cleaning brush, so that the cleaning brush removes the adhesions adhering to the lower part of the insulating rod 212. The cleaning brush can be located above the intensifying screen 23 to prevent the adhesions from detaching before the insulating rod 212 passes through the cleaning brush during shooting.

[0052] In this embodiment, the probing driving member 211 is mounted on the tank rack 14 through a fixing seat. The fixing seat includes a vertical plate 213 and a first flat plate 214. The vertical plate 213 is fixed to the inner side surface of the tank rack 14, and the first flat plate 214 is fixed to the upper end of the vertical plate 213. The probing driving member 211 includes a servo motor 2111, a screw rod 2112, and a nut seat 2113. The servo motor 2111 is fixed on the first flat plate 214 and is in transmission connection with the screw rod 2112 for driving the screw rod 2112 to rotate. The screw rod 2112 passes through the first flat plate 214 and is rotatably connected to the first flat plate 214. The nut seat 2113 is in threaded connection with the screw rod 2112, and the upper part of the insulating rod 212 is fixedly connected to the nut seat 2113.

[0053] Specifically, the upper part of the insulating rod 212 is installed in a trough box 2121 having a trough, and the upper part of the insulating rod 212 is fixedly connected to the nut seat 2113 through the trough box 2121. In other embodiments, the probing driving member 211 can also be other driving structures such as a driving cylinder that can drive the insulating rod 212 to move linearly.

[0054] In this embodiment, to ensure the smooth linear movement of the nut seat 2113, the fixing seat further includes a second flat plate 215 and two sliding shafts 216. The second flat plate 215 is fixed to the lower end of the vertical plate 213. The two sliding shafts 216 are respectively disposed on both sides of the screw rod 2112, and the sliding shafts 216 are connected between the first flat plate 214 and the second flat plate 215. The two horizontal ends of the nut seat 2113 are respectively slidably connected to the corresponding sliding shafts 216.

[0055] In this embodiment, the control unit further includes an identification module and a measurement module. The control unit obtains the depths of the upper liquid layer, the middle liquid layer, and the lower liquid layer from the images acquired by the imaging mechanism 22, specifically including:

[0056] The identification module identifies the boundaries between adjacent liquid layers and the boundary between the upper liquid layer and the insulating rod 212 in the image to determine the position of each layer. The measurement module measures the depths of the upper liquid layer, the middle liquid layer, and the lower liquid layer according to the position of each layer.

[0057] Alternatively, the recognition module determines the positions of the upper layer liquid, the middle layer liquid, and the lower layer liquid according to the mapping table of image colors and layer categories stored therein, and the measurement module measures the depths of the upper layer liquid, the middle layer liquid, and the lower layer liquid according to the positions of each layer.

[0058] In this embodiment, the mapping table can be set in the control unit, and the mapping table can include the mapping relationship between the image colors and the layer categories.

[0059] As another alternative embodiment, the categories of each layer can be determined according to the order of each layer in the image. For example, from top to bottom, the first layer is the raw material layer, the second layer is the electrolyte layer, and the third layer is the refined aluminum layer. The positions of each layer are determined by identifying the dividing lines in the image.

[0060] In this embodiment, the control device further includes a temperature measuring device 3 and a temperature regulating device. The control device is further configured to control the temperature measuring device 3 to sense the current temperatures of the three-layer liquid in the refined aluminum tank 1 during the refining process; and to control the temperature regulating device to adjust the temperatures of the three-layer liquid in the refined aluminum tank 1 during the refining process; the control unit is also electrically connected to the temperature measuring device 3 and the temperature regulating device, and is configured to obtain the temperature differences of the three-layer liquid according to the set temperatures and the current temperatures of the three-layer liquid respectively, and obtain the required temperature adjustment amounts of the three-layer liquid according to the temperature differences and the depths of the three-layer liquid respectively, and then control the output of the temperature regulating device according to the required temperature adjustment amounts of the three-layer liquid respectively.

[0061] In this embodiment, as Figure 4 and Figure 5 shown, the temperature measuring device 3 is movably connected above the refined aluminum tank 1 in the vertical direction, and the control unit is configured to drive the detection end of the temperature measuring device 3 to descend into the refined aluminum tank 1, so as to obtain the current temperatures of the three-layer liquid in the refined aluminum tank 1.

[0062] In this embodiment, the temperature measuring device 3 includes a reading mechanism, a temperature measuring mechanism 31, and a temperature measuring driving member 32. Among them, the temperature measuring driving member 32 is connected to the temperature measuring mechanism 31 and is configured to drive the temperature measuring mechanism 31 to lift and lower, so that the temperature measuring mechanism 31 extends into the liquid levels of each layer in the refined aluminum tank 1.

[0063] During the production process of three-layer refined aluminum electrolysis, the three-layer liquid in the refined aluminum tank 1 needs to be maintained at different set temperatures respectively. It should be noted that the depth measuring device 2 for the three-layer liquid has measured the depths of each layer of liquid, and the depths of each layer of liquid can be temporarily stored in the control unit for calling. The control unit can obtain the lifting and lowering strokes corresponding to each layer by the depth of each layer of liquid and the current position of the temperature measuring mechanism 31, and control the temperature measuring driving member 32 to drive the temperature measuring mechanism 31 to descend the corresponding stroke, and the temperature measuring mechanism 31 can reach the corresponding layer.

[0064] In this embodiment, the control unit obtains the required temperature adjustment amounts for the three-layer liquid according to the respective temperature differences and depths of the three-layer liquid, that is, how much heating amount is still required to reach the set temperature, and then controls the output of the temperature adjustment device of the refined aluminum tank 1 according to the required temperature adjustment amounts for the three-layer liquid. This setting method can directly and real-time regulate the temperatures of the liquid layers in the refined aluminum tank 1 online. Through this precise regulation, it can ensure that each liquid layer is at the optimal set temperature, effectively improve production efficiency, and improve product quality.

[0065] In this embodiment, the control unit can adopt a commercially available industrial control computer or a PLC controller. For example, an industrial control computer with the model IPC-610L produced by Advantech. The control unit also includes a calculation module, and the process of obtaining the required temperature adjustment amounts for the three-layer liquid can be completed by presetting calculation formulas in the calculation module. The calculation formulas are related to multiple factors such as the working temperature, the composition of each liquid layer, the power of the temperature adjustment device, mechanical properties, and the volume of the refined aluminum tank, and can be specifically determined by the staff according to the above factors and then input into the control unit.

[0066] In this embodiment, the reading mechanism is electrically connected to the temperature measuring mechanism 31, is used to receive the temperature electrical signal measured by the temperature measuring mechanism 31, generates temperature data according to the temperature electrical signal, and outputs the temperature data. The reading mechanism can adopt a commercially available WPK6 series single-channel thermotechnical meter, which can display real-time temperature data. The staff can obtain the real-time temperature data of each layer through the reading mechanism. Therefore, this system can automatically measure the temperature of the aluminum liquid in the refined aluminum tank 1 to improve the measurement efficiency and temperature measurement accuracy, and can also avoid the danger caused by manual temperature measurement. Moreover, the temperature measurement device 3 can measure the temperature of each layer separately to obtain the detailed temperature of each layer.

[0067] In this embodiment, a height sensor can be set on the temperature measuring mechanism 31 to sense the current height of the temperature measuring mechanism 31, so that the control unit can control the lifting stroke of the temperature measuring mechanism 31 according to the current height of the temperature measuring mechanism 31 and the depth positions of the three-layer liquid to be measured, so as to accurately reach the positions of each liquid layer.

[0068] In this embodiment, the temperature measuring mechanism 31 includes a thermocouple and a thermocouple protection sleeve. The thermocouple protection sleeve is connected to the temperature measuring driving member 32, and the thermocouple is accommodated in the thermocouple protection sleeve. Therefore, the thermocouple and the thermocouple protection sleeve can be synchronously driven to move through the temperature measuring driving member 32. The thermocouple is connected to the reading mechanism and is used to measure the temperature of each layer separately and send a temperature electrical signal to the reading mechanism. Specifically, the thermocouple can adopt a commercially available K-type thermocouple.

[0069] Due to the high temperature and strong oxidation characteristics of the molten liquid in the refined aluminum tank 1, using a conventional thermocouple for temperature measurement has problems such as a short service life, inability to continuously measure for a long time, and high use and maintenance costs. Sheathing a thermocouple protection sleeve outside the thermocouple can effectively extend the service life of the thermocouple. Preferably, the thermocouple protection sleeve is made of silicon nitride material. Further, a corrosion-resistant layer is coated on the outside of the thermocouple protection sleeve, and the corrosion-resistant layer is made of titanium dioxide material.

[0070] In this embodiment, the temperature measurement driving member 32 includes a motor 321, a lead screw 322, a nut, a connecting block 323, and a guide rod 324. Among them, the lead screw 322 extends in the vertical direction, and the nut is sleeved on the lead screw 322. The motor 321 is drivingly connected to the lead screw 322 and is used to drive the lead screw 322 to rotate, thereby driving the nut to move along the extension direction of the lead screw 322. The nut is connected to the connecting block 323, and the guide rod 324 extends in the vertical direction and passes through the connecting block 323, and is used to guide the nut and the connecting block 323 to move in the vertical direction. The temperature measurement mechanism 31 is installed on the connecting block 323 and can move in the vertical direction along with the nut and the connecting block 323. Through the lead screw-nut mechanism, more precise lifting and lowering movement can be achieved, so that the thermocouple can reach each aluminum liquid layer.

[0071] Specifically, in this embodiment, the control unit is connected to the motor 321 through a wire. By controlling the rotation direction of the motor 321, the rising or falling of the nut is controlled, and thus the lifting and lowering of the temperature measurement mechanism 31 is controlled. Of course, it can be understood that the temperature measurement driving member 32 can also adopt existing structures such as air cylinders, hydraulic cylinders, and electric push rods.

[0072] More specifically, the temperature measurement driving member 32 further includes a mounting plate 325, and the mounting plate 325 extends in the vertical direction. The upper and lower ends of the mounting plate 325 are respectively fixedly connected with a first ear plate 326 and a second ear plate 327, and the first ear plate 326 and the second ear plate 327 are horizontally arranged. The motor 321 is installed on the upper side of the first ear plate 326, and the upper and lower ends of the lead screw 322 are respectively rotatably connected to the first ear plate 326 and the second ear plate 327 through bearings. The output rotating shaft of the motor 321 is connected to the upper end of the lead screw 322 and is used to drive the lead screw 322 to rotate. The number of the guide rods 324 is two, and the two guide rods 324 are respectively located on the left and right sides of the lead screw 322, and the upper and lower ends of the guide rod 324 are respectively connected to the first ear plate 326 and the second ear plate 327. Preferably, the mounting plate 325, the first ear plate 326, and the second ear plate 327 are all made of Q235 steel.

[0073] In this embodiment, the control device may also be configured with a warning device. The standard temperature range of each layer is pre-stored in the control unit. The control unit is used to determine the layer where the temperature measuring mechanism 31 is located according to the lifting stroke of the temperature measuring mechanism 31, and then determine the standard temperature range of this layer. The control unit is electrically connected to the reading mechanism and is used to obtain the actually measured temperature data of this layer and compare the actually measured temperature data with the standard temperature range. The control unit is electrically connected to the warning device and is used to send a start signal to the warning device when the temperature data of the layer exceeds the standard temperature range, and the warning device issues a warning according to the start signal to prompt the staff to handle this situation in time.

[0074] In this embodiment, the temperature measuring device 3 is installed on the tank rack 14. Among them, the temperature measuring driving member 32 is connected to the tank rack 14 through the mounting plate 325, and the bottom end of the temperature measuring mechanism 31 extends into the refined aluminum tank 1 through the feeding port 111.

[0075] In this embodiment, as Figure 6 shown, the control device further includes a cathode height control device 4. The cathode height control device 4 includes a cathode lifting driving member 41 and a cathode rod 42. The bottom end of the cathode rod 42 is immersed in the upper layer liquid in the refined aluminum tank 1. The control unit includes an acquisition module. The acquisition module is used to acquire the real-time depth of the cathode rod 42 immersed in the upper layer liquid in the refined aluminum tank 1. The control unit is also electrically connected to the cathode lifting driving member 41 and is used to judge whether the real-time depth of the cathode rod 42 immersed in the upper layer liquid is within the set range. If it is not within the set range, the cathode lifting driving member 41 is controlled to drive the cathode rod 42 to lift and lower to adjust its current height until the real-time depth of the cathode rod 42 immersed in the upper layer liquid is within the set range.

[0076] In this embodiment, the acquisition module includes an image recognition component, which is used to obtain the current height of the cathode rod 41 by recognizing the marking value set on the cathode rod 41 through an image, or the current height of the cathode rod 41 can also be directly obtained by human eye observation and then input into the control unit. The acquisition module further includes a laser measuring component 43, which is used to obtain the current height of the liquid surface of the aluminum liquid by the time when the laser light is reflected on the liquid surface. The laser measuring component 43 is installed on the tank rack 14 and is located above the refined aluminum tank 1. The acquisition module sends the current height of the cathode rod 41 and the current height of the liquid surface of the aluminum liquid to the calculation module, and the calculation module calculates the real-time depth of the cathode rod 41 immersed in the aluminum liquid according to the two.

[0077] The inventor of the present invention has found that problems such as arc striking or short - circuiting that often occur during the three - layer electrolytic refining process are related to the depth of the cathode immersed in the molten aluminum. If the depth of the cathode immersed in the molten aluminum is too shallow, arc striking will occur. If the depth of the cathode immersed in the molten aluminum is too deep, the cathode may contact the electrolyte and cause a short - circuit. Therefore, to avoid these problems, the system of this embodiment automatically controls the depth of the cathode rod 41 immersed in the molten aluminum (i.e., the upper layer of the three - layer liquid) through the cathode height control device 4. After real - time adjustment, the depth of the cathode rod 41 immersed in the molten aluminum is always within an appropriate set range, neither too shallow to cause arc striking nor too deep to cause the cathode to contact the electrolyte and cause a short - circuit, avoiding the interruption of the refining process caused by such problems, which is conducive to ensuring production safety and the normal progress of production, ensuring the stability of the refining process, improving production efficiency, and ensuring product quality.

[0078] Since the aluminum addition step (adding refining raw materials into the refined aluminum tank 1), the aluminum extraction step (obtaining the refined product from the refined aluminum tank 1), and the change over time are the main reasons for the change in the liquid level of the molten aluminum during the entire refining process, in the refining process of this system, the real - time depth of the cathode rod 41 immersed in the molten aluminum is adjusted every second set time / after completing the aluminum addition step / after completing the aluminum extraction step, so that the real - time depth is within the set range.

[0079] Specifically, in this embodiment, the control unit is also used to receive the detection trigger signal triggered by the operator after performing the aluminum addition operation / aluminum extraction operation on the refined aluminum tank 1. The control unit is also used to send a control instruction to the acquisition module when receiving the detection trigger signal / when the timing module counts the second set time, driving it to acquire the real - time depth of the cathode rod 41 immersed in the molten aluminum. In this embodiment, the second set time can be one hour, that is, every hour the control unit sends a control instruction to the acquisition module, driving it to acquire the real - time depth of the cathode rod 41 immersed in the upper layer of the refined aluminum tank 1.

[0080] This setting method can not only avoid the depth of the cathode rod 41 immersed exceeding the set range caused by the change in the liquid level height during operation, but also avoid the depth of the cathode rod 41 immersed exceeding the set range caused by the change in the liquid level height over time or other situations, that is, comprehensively considering the active and passive factors that cause the depth of the cathode rod 41 immersed to exceed the set range.

[0081] The control equipment of the refined aluminum tank 1 can be equipped with a main control console, which is used to monitor the refining process. After the operator completes the aluminum addition operation step and the aluminum extraction operation step, a detection trigger signal is generated through the main control console and sent to the control unit, thereby triggering the cathode height control device 4 to perform the step of automatically controlling the depth of the cathode rod 41 immersed in the molten aluminum.

[0082] In this embodiment, the real-time depth at which the cathode rod 41 is immersed in the molten aluminum specifically refers to the distance between the bottom end of the cathode rod 41 and the liquid level of the molten aluminum. The set range of the real-time depth is preferably 5 cm to 15 cm. When the acquired real-time depth is not within the set range, it is automatically adjusted to any depth within 5 cm to 15 cm. After the system of this embodiment was tried out, there was indeed no longer any arcing or short-circuit phenomenon caused by problems between the cathode and the liquid level.

[0083] In this embodiment, the cathode lifting drive member 41 includes a lifting motor 411, a transmission mechanism 412, and a bus bar 413. A plurality of cathode rods 41 serving as cathodes are connected to the bus bar 413. The transmission mechanism 412 is connected between the lifting motor 411 and the bus bar 413. The lifting motor 411 is electrically connected to the control unit and is used to drive the transmission mechanism 412 to drive the bus bar 413 to lift, thereby driving the cathode rod 41 to lift to adjust the current height of the cathode.

[0084] In this embodiment, the transmission mechanism 412 includes a lifting assembly 4121. The lifting assembly 4121 includes a bus bar clamp 4122, a lifting shaft 4123, and a transmission shaft 4124. There are two bus bar clamps 4122, which are respectively used to clamp both ends of the bus bar 413. There are also two lifting shafts 4123, which are respectively connected to each bus bar clamp 4122. The end of the transmission shaft 4124 is connected to the output end of the lifting motor 411, and the shaft body is drivingly connected to the two lifting shafts 4123. It is used to drive the two lifting shafts 4123 to drive the two bus bar clamps 4122 to lift synchronously under the drive of the lifting motor 411, so that the bus bar 413 can remain horizontal during the lifting process, so that the immersion depths of the respective cathode rods 41 are consistent.

[0085] In this embodiment, there are two groups of bus bars 413, and eight cathode rods 41 are provided on each group of bus bars 413. The transmission mechanism 412 includes two groups of lifting assemblies 4121, and each group of lifting assemblies 4121 corresponds to the two groups of bus bars 413 one by one.

[0086] A cross beam 44 is provided on the trough frame 14. The transmission shaft 4124 is rotatably connected to the cross beam 44, and the lifting motor 411 is also connected to the cross beam 44. The lifting motor 411 is a motor with a model number of G-A-13-002-9 and is connected to the transmission shaft 4124 through a coupling. The transmission shaft 4124 and the lifting shaft 4123 are drivingly connected through a worm and worm gear pair, that is, a worm wheel is provided on the transmission shaft 4124, and a worm rod section is provided on the lifting shaft 4123. The bottom end of the lifting shaft 4123 is rotatably connected to the bus bar clamp 4122 through a bearing, etc. When the transmission shaft 4124 is driven by the lifting motor 411 to rotate, the lifting shaft 4123 can be driven to lift.

[0087] In this embodiment, the control device further includes an interpolar hydraulic pressure drop measuring device 5, which is used to obtain the interpolar hydraulic pressure drop between the upper liquid and the lower liquid in the refined aluminum bath 1 during the refining process. It should be noted that the refined aluminum bath 1 has an anode and a cathode. The anode is connected to the lower liquid, and the cathode rod 41 as the cathode is connected to the upper liquid. During electrolytic refining, the anode and the cathode are connected to a power supply, so that a direct current is generated between the cathode and the anode. Under the action of the direct current, an electrochemical reaction occurs in the melt in the refined aluminum bath 1. The primary aluminum located at the bottom of the refined aluminum bath 1 dissolves to generate aluminum ions, and the aluminum ions move to the cathode to form a refined aluminum layer at the upper part of the refined aluminum bath 1. The remaining impurities in the electrolytic reaction accumulate in the anode conductor at the bottom of the bath and the intermediate electrolyte layer, resulting in an increase in the interpolar hydraulic pressure drop between the cathode and the anode. Therefore, in this embodiment, by monitoring the pressure drop value between the interpolar liquids with the interpolar hydraulic pressure drop measuring device 5, the impurity content in the refined aluminum bath 1 can be judged.

[0088] Specifically, the interpolar hydraulic pressure drop measuring device 5 includes a cathode probe 51, an anode probe 52, and an anode probe driving member 53. The cathode probe 51 is electrically connected to the cathode rod 42 to be electrically connected to the upper liquid in the refined aluminum bath 1 through the cathode rod 42. The anode probe driving member 53 is connected to the anode probe 52 and is used to drive the anode probe 52 to move up and down so that the anode probe 52 contacts the lower liquid in the refined aluminum bath 1. The control unit is also electrically connected to the cathode probe 51 and the anode probe 52 respectively, and is used to obtain the interpolar hydraulic pressure drop between the upper liquid and the lower liquid in the refined aluminum bath 1 when the anode probe 52 contacts the lower liquid in the refined aluminum bath 1, so as to judge the impurity content in the refined aluminum bath 1.

[0089] Among them, both the cathode probe 51 and the anode probe 52 are made of conductive materials. The cathode probe 51 and the anode probe 52 are electrically connected to the control unit through wires or signal transceiver modules such as wireless and Bluetooth. Preferably, both the cathode probe 51 and the anode probe 52 are made of stainless steel. Further, the anode probe 52 and the cathode probe 51 can adopt commercially available K-type screw probes. Of course, the cathode probe 51 and the anode probe 52 can also be made of other materials, such as materials with strong conductivity like copper alloy.

[0090] When the anode probe driving member 53 drives the anode probe 52 to descend until it contacts the lower liquid in the refined aluminum bath 1, the measurement circuit composed of the cathode probe 51, the anode probe 52, and the control unit is turned on, enabling current to pass through the control unit. At this time, the control unit can measure the interpolar hydraulic pressure drop between the cathode and the anode in the refined aluminum bath 1. Specifically, the control unit includes a voltage measurement module for measuring this interpolar hydraulic pressure drop, and this voltage measurement module can select a commercially available voltmeter, for example: a voltmeter of the OHR-C200 model produced by Hongrun Company.

[0091] In this embodiment, a second position sensor is provided on the anode probe 52 for sensing the position of the anode probe 52. When the second position sensor senses that the anode probe 52 is at a position in contact with the lower layer liquid in the refined aluminum bath 1, it sends a pressure measurement signal to the control unit. After receiving the pressure measurement signal, the control unit measures the electrode liquid pressure drop between the upper layer liquid and the lower layer liquid in the refined aluminum bath 1. After the measurement is completed, the control unit controls the anode probe driving member 53 to drive the anode probe 52 to rise. When the second position sensor senses that the anode probe 52 is at the reset position, it sends a reset signal to the control unit, and the control unit controls the anode probe driving member 53 to stop driving.

[0092] In the large three-layer liquid refined aluminum bath 1, the amount of electrode liquid is large. Therefore, in order to ensure the production efficiency of refined aluminum, multiple pairs of cathodes and anodes are provided in the refined aluminum bath 1. Since the impurity content of the electrode liquid between each pair of cathodes and anodes is different, measuring only the voltage drop between a group of cathodes and anodes is not sufficient to reflect the electrode liquid pressure drop in the entire refined aluminum bath 1, nor is it sufficient to judge the operating condition of the refined aluminum bath 1. Therefore, in this embodiment, there are multiple cathode rods 42, multiple cathode probes 51 corresponding to each cathode rod 42, and multiple anode probes 52. The anode probes 52 are arranged in pairs with the cathode probes 51, so that the control unit can obtain the electrode liquid pressure drops at multiple positions between the upper layer liquid and the lower layer liquid in the refined aluminum bath 1.

[0093] Specifically, the number of cathode probes 51 is the same as that of cathode rods 42, which is 16. These 16 cathode probes 51 are divided into two groups, with 8 cathode probes 51 in each group. The two groups of cathode probes 51 are respectively located on the left and right sides of the refined aluminum bath 1 and correspond to the cathode rods 42 one by one.

[0094] The number of anode probes 52 is also 16. These anode probes 52 are also divided into two groups and correspond to the cathode probes 51 one by one. Anode probe driving members 53 are respectively installed on the left and right sides of the refined aluminum bath 1, and each anode probe driving member 53 is connected to a group of anode probes 52. One anode probe driving member 53 is used to drive a group of anode probes 52 to rise and fall synchronously so that the anode probes 52 can contact the anodes in the refined aluminum bath 1. Of course, it can be understood that the installation positions of the anode probes 52 and the cathode probes 51 should be adjusted according to the positions of multiple pairs of anodes and cathodes in the refined aluminum bath 1.

[0095] In this embodiment, the number of voltage measurement modules is multiple. Each voltage measurement module is connected to a pair of anode probes 52 and cathode probes 51 and is used to measure the electrode liquid pressure drop value between the anode and its corresponding cathode when the anode probe 52 contacts the lower layer liquid in the refined aluminum bath 1. Through multiple voltage measurement modules, the electrode liquid pressure drops between multiple groups of anodes and cathodes in the refined aluminum bath 1 can be measured simultaneously.

[0096] The control unit is used to receive data signals sent by multiple voltage measurement modules and output multiple extreme pressure drop data, so that the staff can observe the extreme pressure drop values at various locations in the refined aluminum tank 1 in real time. Specifically, the control unit can be configured with a data output module, and the data output module can use a commercially available liquid crystal display.

[0097] The anode probe driving member 53 includes a lifting rod 536 and two driving motors 531. The lifting rod 536 extends in the horizontal direction, and a plurality of anode probes 52 are mounted on the lifting rod 536. The two driving motors 531 are respectively connected to the two ends of the lifting rod 536 for driving the lifting rod 536 to move up and down.

[0098] Specifically, a lead screw 533, a nut, a connecting piece 534 and a guide rod 535 are provided at the output end of the driving motor 531. The lead screw 533 extends in the vertical direction, and the nut is sleeved on the lead screw 533. The driving motor 531 is transmission-connected to the lead screw 533, and is used to drive the lead screw 533 to rotate, thereby driving the nut to move along the extension direction of the lead screw 533. The nut is connected to the connecting piece 534. The guide rod 535 extends in the vertical direction and passes through the connecting piece 534, and is used to guide the nut and the connecting piece 534 to move in the vertical direction. The lifting rod 536 is fixedly connected to the connecting piece 534, and can move in the vertical direction along with the nut and the connecting piece 534.

[0099] The anode probe driving member 53 also includes a mounting member 532. The mounting member 532 extends in the vertical direction, and the upper and lower ends of the mounting member 532 are respectively fixedly connected to two horizontally arranged ear plates. The driving motor 531 is installed on the upper side of the upper ear plate, and the upper and lower ends of the lead screw 533 are rotatably connected to the two ear plates through bearings. The output shaft of the driving motor 531 is connected to the upper end of the lead screw 533. There are two guide rods 535, and the two guide rods 535 are respectively located on the left and right sides of the lead screw 533, and the upper and lower ends of the guide rods 535 are respectively connected to the two ear plates. Preferably, the mounting member 532 and the two ear plates are made of Q235 steel.

[0100] Of course, it is understandable that the drive motor 531 can also adopt existing structures such as a cylinder, a hydraulic cylinder, and an electric push rod.

[0101] In this embodiment, the control unit prestores the descending stroke of the anode probe 52, that is, the distance between the initial position of the anode probe 52 and the anode. The control unit is electrically connected to the drive motor 531 and is configured to send a drive signal to the drive motor 531 when receiving a start command issued by a staff member. After receiving the drive signal, the drive motor 531 starts to drive the lead screw 533 to rotate, thereby driving the anode probe 52 to descend a preset stroke, so that the anode probe 52 contacts the lower layer of liquid, thereby electrically connecting the anode, or directly electrically connecting the anode. When the anode probe 52 is connected to the anode, the measurement circuit between the cathode probe 51, the voltage measurement module and the anode probe 52 is turned on, and the voltage measurement module collects a voltage signal, and then measures the voltage drop value between the cathode and the anode. When the control unit receives the voltage signal output by the voltage measurement module, it sends a reset signal to the drive motor 531. The drive motor 531 drives the lead screw 533 to reverse according to the reset signal, so that the anode probe 52 rises to the initial position and the measurement is completed.

[0102] In this embodiment, the refined aluminum tank 1 includes a tank body 11, a cover door 12 and an opening / closing drive member 13. Three layers of liquid are contained in the tank body 11. A feeding port 111 is opened in the upper part of the tank body 11 for feeding primary aluminum into the tank body 11. The drive end of the opening / closing drive member 13 is connected to the cover door 12, and the control unit is electrically connected to the opening / closing drive member 13 for controlling the opening / closing drive member 13 to drive the cover door 12 to close the feeding port 111 and open the feeding port 111.

[0103] Specifically, the position directly above the feeding port 111 is set as the first position, and one side of the feeding port 111 is set as the second position. The opening / closing drive member 13 is connected to the cover door 12 and is configured to drive the cover door 12 so that the cover door 12 moves between the first position and the second position. When the cover door 12 is in the first position, it can close the feeding port 111, and when the cover door 12 is in the second position, the feeding port 111 is opened.

[0104] The cover door 12 is made of aluminum alloy material. Moreover, the thickness of the cover door 12 is about 100 mm. By providing the cover door 12 to close the feeding port 111, the heat preservation inside the tank body 11 can be realized. In addition, when it is necessary to feed the tank body 11, by moving the cover door 12 from the first position to the second position through the opening / closing drive member 13, the feeding port 111 can be opened, which is convenient for the staff to add primary aluminum into the tank body 11. Therefore, this tank body 11 can effectively avoid the reduction of the temperature inside the tank, thereby reducing the influence on the current distribution inside the tank, and will not affect the normal production.

[0105] In this embodiment, the cover door 12 is in a plate shape. The cover door 12 is hinged to the upper end of the tank body 11 through a connecting rod 15. The opening / closing drive member 13 is configured to push the cover door 12 to swing the connecting rod 15, thereby moving the cover door 12 between the first position and the second position.

[0106] Further, the opening and closing driving member 13 includes a pushing member 131 and an ear rod 133. A slot frame 14 is installed at the upper end of the slot body 11, and the pushing member 131 is installed on the slot frame 14 of the slot body 11. The pushing member 131 includes a telescopic rod 132 extending in the horizontal direction and can be telescoped in the horizontal direction. One end of the telescopic rod 132 is connected to the cover door 12 through the ear rod 133 for pushing the ear rod 133, thereby driving the cover door 12 to move between a first position and a second position. The ear rod 133 includes a first section and a second section. The first section of the ear rod 133 extends in the vertical direction, its lower end is connected to the cover door 12, and its upper end is hinged to the second section of the ear rod 133. The other end of the second section of the ear rod 133 is connected to the telescopic rod 132. When the telescopic rod 132 extends, the ear rod 133 pushes the cover door 12 so that the cover door 12 moves to the first position. When the telescopic rod 132 retracts, the ear rod 133 pulls the cover door 12 so that the cover door 12 moves to the second position. Since the temperature of the slot body 11 is relatively high, the telescopic rod 132 and the ear rod 133 should be made of heat-resistant materials. Preferably, the telescopic rod 132 and the ear rod 133 are made of A3 stainless steel material.

[0107] Furthermore, the pushing member 131 is a cylinder, and the cylinder can select existing products, for example: a cylinder with the model number MSPCB32 produced by Misumi Corporation. Of course, it can be understood that the pushing member 131 can also be a hydraulic cylinder or an electric screw rod, etc.

[0108] In this embodiment, a ring-shaped protrusion 112 is provided at the upper edge of the upper end of the feeding port 111. A groove 121 is provided at the bottom of the cover door 12. The groove 121 is cylindrical and is used to accommodate the ring-shaped protrusion 112 therein to achieve the seal between the cover door 12 and the feeding port 111, and further improve the heat preservation effect of the cover door 12 on the electrolyte inside the slot body 11.

[0109] Further, a heat preservation layer is provided in the groove 121 of the cover door 12 for strengthening the heat preservation effect of the cover door 12. Preferably, the heat preservation layer is made of calcium silicate material.

[0110] In this embodiment, the control device further includes a transportation unit. The control unit is electrically connected to the transportation unit and is used for comparing the actual depth of the lower layer liquid with the set depth of the lower layer liquid after obtaining the depths of the three-layer liquids in the refined aluminum tank 1 through the three-layer liquid depth measuring device 2, and when the depth of the lower layer liquid is lower than the set depth, controlling the transportation unit to transport the primary aluminum to the feeding port 111.

[0111] A position sensor is provided on the transport unit, and a second induction point is set at the feeding port 111. When the position sensor senses the second induction point, it sends an aluminum adding signal to the control unit. After receiving the aluminum adding signal, the control unit sends a first control signal to control the opening and closing drive member 13 to drive the cover door 12 to open the feeding port 111. The timing module of the control unit is also used to start timing when the first control signal is sent, and after the timing duration reaches the feeding duration, it sends a second control signal to control the opening and closing drive member 13 to drive the cover door 12 to close the feeding port 111.

[0112] In this embodiment, the transport unit is an AGV cart, that is, an automatic guided vehicle. By presetting the movement route of the AGV cart in advance, the AGV cart can move back and forth automatically between the storage point of the aluminum ingots and the refined aluminum tank 1. When the AGV cart reaches the storage point of the aluminum ingots, it sends a first prompt signal to the staff to remind the staff to carry the aluminum ingots onto the AGV cart. When the AGV cart reaches the feeding port 111 of the refined aluminum tank 1, the AGV cart sends a second prompt signal, that is, an aluminum adding signal, to the control unit, and the control unit sends a first control signal to the opening and closing drive member 13 according to the second prompt signal. The opening and closing drive member 13 controls the telescopic rod 132 to contract according to the first control signal to drive the cover door 12 to move from the first position to the second position, thereby opening the feeding port 111 to facilitate the staff to add materials.

[0113] It should be noted that a first induction point is set at the aluminum ingot storage point, and a second induction point is set at the feeding port 111 of the refined aluminum tank 1. When the AGV cart reaches the aluminum ingot storage point, the position sensor can sense the first induction point, thereby sending a first prompt signal; when the AGV cart reaches the feeding port 111, the position sensor can sense the second induction point, thereby sending a second prompt signal.

[0114] Of course, in some other embodiments, a timer can also be set in the AGV cart. The timer is used to calculate the running time of the AGV cart, so as to know the position of the AGV cart. Taking one round trip of the AGV cart between the aluminum ingot storage point and the refined aluminum tank 1 as an operation cycle, since the distance between the aluminum ingot storage point and the refined aluminum tank 1 remains unchanged, the operation cycle of the AGV cart also basically remains unchanged. When the running time of the AGV cart reaches an operation cycle, it is determined that the AGV cart reaches the feeding port 111 of the refined aluminum tank 1, and a second prompt signal is sent to the control unit through the timer.

[0115] In this embodiment, in order to keep warm, the top of the tank body 11 is closed, but in order for the cathode height control device 4 and the pole hydraulic drop measuring device 5 to detect smoothly, holes can be opened at the corresponding positions to facilitate their entry.

[0116] It is understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principles of the present invention, and the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims

1. A high-purity aluminum production system, characterized in that: It includes a refined aluminum tank (1) and control equipment. There are three layers of liquid in the refined aluminum tank (1). The control equipment is used to control the refined aluminum tank (1) to perform the refining process. The control equipment includes a control unit and a three-layer liquid depth measuring device (2). The control equipment is also used to control the three-layer liquid depth measuring device (2) to measure the respective depths of the three layers of liquid in the refined aluminum tank (1) during the refining process. The three-layer liquid depth measuring device (2) is arranged above the refined aluminum tank (1) and includes a probing mechanism (21) and a camera mechanism (22); the control unit is electrically connected to the probing mechanism (21) and is used to control the probing mechanism (21) to probe into the refined aluminum tank (1) and abut against the bottom of the refined aluminum tank (1), and then completely move it out of the refined aluminum tank (1), so that the probing mechanism (21) adheres to the adherents in the three layers of liquid; the control unit is also electrically connected to the camera mechanism (22) and is used to control the camera mechanism (22) to take an image of the probing mechanism (21) after the probing mechanism (21) moves out of the refined aluminum tank (1), so as to obtain the respective depths of the three layers of liquid in the refined aluminum tank (1) through the image; the probing mechanism (21) includes a probing driving part (211) and an insulating rod (212). The probing driving part (211) is electrically connected to the control unit and is used to drive the insulating rod (212) to descend and probe into the refined aluminum tank (1) and ascend and move out of the refined aluminum tank (1) under the control of the control unit.

2. The high-purity aluminum production system according to claim 1, wherein: A first position sensor is arranged on the probing mechanism (21) for sensing the position of the probing mechanism (21). The control unit includes a timing module. When the first position sensor senses that the probing mechanism (21) is in the position abutting against the bottom of the refined aluminum tank (1), it sends a depth measuring signal to the control unit. After receiving the depth measuring signal, the control unit makes the timing module start timing. After the timing module times to the first set time, the control unit controls the probing mechanism (21) to completely move out of the refined aluminum tank (1). When the first position sensor senses that the probing mechanism (21) is in the position of completely moving out of the refined aluminum tank (1), it sends a shooting signal to the control unit. After receiving the shooting signal, the control unit controls the camera mechanism (22) to take an image of the probing mechanism (21).

3. The high-purity aluminum production system according to claim 1, characterized in that: The three-layer liquid depth measuring device (2) further includes an intensifying screen (23). The intensifying screen (23) is arranged above the refined aluminum tank (1). The control unit controls the probing driving part (211) to drive the insulating rod (212) to ascend and move out of the refined aluminum tank (1), and makes the lower part of the insulating rod (212) with adherents correspond to the position of the intensifying screen (23). At this time, the camera mechanism (22) and the intensifying screen (23) are respectively on both sides of the insulating rod (212). The intensifying screen (23) is used to improve the contrast of the image taken by the camera mechanism (22) when photographing the lower part of the insulating rod (212).

4. The high-purity aluminum production system according to claim 1, wherein: The control device further includes a temperature measuring device (3) and a temperature regulating device. The control device is further configured to control the temperature measuring device (3) to sense the current temperature of each of the three layers of liquid in the refined aluminum bath (1) during the refining process; and to control the temperature regulating device to adjust the temperature of the three layers of liquid in the refined aluminum bath (1) during the refining process. The control unit is also electrically connected to the temperature measuring device (3) and the temperature regulating device, and is configured to obtain the temperature difference of each of the three layers of liquid based on the set temperature and the current temperature of each of the three layers of liquid, and obtain the required temperature adjustment amount of each of the three layers of liquid based on the temperature difference and the depth of each of the three layers of liquid, and then control the output of the temperature regulating device according to the required temperature adjustment amount of each of the three layers of liquid.

5. The high-purity aluminum production system according to claim 4, characterized in that: The temperature measuring device (3) is movably connected above the refined aluminum bath (1) in the vertical direction. The control unit is configured to drive the detection end of the temperature measuring device (3) to descend into the refined aluminum bath (1) so as to obtain the current temperature of each of the three layers of liquid in the refined aluminum bath (1).

6. The high-purity aluminum production system according to claim 1, wherein: The control device further includes a cathode height control device (4). The cathode height control device (4) includes a cathode lifting driving member (41) and a cathode rod (42). The bottom end of the cathode rod (42) is immersed in the upper layer of liquid in the refined aluminum bath (1). The control unit includes an acquisition module configured to acquire the real-time depth of the cathode rod (42) immersed in the upper layer of liquid in the refined aluminum bath (1) at every second set time / upon completion of the aluminum addition step / upon completion of the aluminum tapping step. The control unit is also electrically connected to the cathode lifting driving member (41) and is configured to determine whether the real-time depth of the cathode rod (42) immersed in the upper layer of liquid is within the set range. If it is not within the set range, the control unit controls the cathode lifting driving member (41) to drive the cathode rod (42) to lift or lower to adjust its current height until the real-time depth of the cathode rod (42) immersed in the upper layer of liquid is within the set range.

7. The high-purity aluminum production system according to claim 6, characterized in that: The control unit further includes a timing module. The control unit is further configured to receive a detection trigger signal triggered after the refined aluminum bath (1) performs an aluminum addition operation / an aluminum tapping operation, and to send a control instruction to the acquisition module to drive it to acquire the real-time depth of the cathode rod (42) immersed in the upper layer of liquid in the refined aluminum bath (1) when receiving the detection trigger signal / when the timing module counts the second set time.

8. The high-purity aluminum production system according to claim 6, wherein: The control device further includes a pole voltage drop measuring device (5) configured to obtain the pole voltage drop between the upper layer of liquid and the lower layer of liquid in the refined aluminum bath (1) during the refining process. The pole voltage drop measuring device (5) includes a cathode probe (51), an anode probe (52) and an anode probe driving member (53). The cathode probe (51) is electrically connected to the cathode rod (42) so as to be electrically connected to the upper layer of liquid in the refined aluminum bath (1) through the cathode rod (42). The anode probe driving member (53) is connected to the anode probe (52) and is configured to drive the anode probe (52) to lift or lower so that the anode probe (52) contacts the lower layer of liquid in the refined aluminum bath (1). The control unit is also electrically connected to the cathode probe (51) and the anode probe (52) respectively, and is configured to obtain the pole voltage drop between the upper layer of liquid and the lower layer of liquid in the refined aluminum bath (1) when the anode probe (52) contacts the lower layer of liquid in the refined aluminum bath (1).

9. The high-purity aluminum production system according to claim 8, wherein: A second position sensor is provided on the anode probe (52) for sensing the position of the anode probe (52). When the second position sensor senses that the anode probe (52) is at a position in contact with the lower layer liquid in the refined aluminum bath (1), it sends a pressure measurement signal to the control unit. After receiving the pressure measurement signal, the control unit measures the electrode hydraulic pressure drop between the upper layer liquid and the lower layer liquid in the refined aluminum bath (1). After the measurement is completed, the control unit controls the anode probe driving member (53) to drive the anode probe (52) to rise. When the second position sensor senses that the anode probe (52) is at the reset position, it sends a reset signal to the control unit, and the control unit controls the anode probe driving member (53) to stop driving.

10. The high-purity aluminum production system according to claim 1, characterized in that: The refined aluminum bath (1) includes a bath body (11), a cover door (12) and an opening / closing driving member (13). The three-layer liquid is contained in the bath body (11). A feeding port (111) is provided in the upper part of the bath body (11) for feeding primary aluminum into the bath body (11). The driving end of the opening / closing driving member (13) is connected to the cover door (12). The control unit is electrically connected to the opening / closing driving member (13) for controlling the opening / closing driving member (13) to drive the cover door (12) to close the feeding port (111) and open the feeding port (111).

11. The high-purity aluminum production system according to claim 10, characterized in that: The control device further includes a transportation unit. The control unit is electrically connected to the transportation unit. After obtaining the respective depths of the three-layer liquid in the refined aluminum bath (1) through the three-layer liquid depth measuring device (2), it compares the actual depth of the lower layer liquid with the set depth of the lower layer liquid. And when the depth of the lower layer liquid is lower than the set depth, it controls the transportation unit to transport the primary aluminum to the feeding port (111). A position sensor is provided on the transportation unit, and an induction point is provided at the feeding port (111). When the position sensor senses the induction point, it sends an aluminum adding signal to the control unit. After receiving the aluminum adding signal, the control unit issues a first control signal to control the opening / closing driving member (13) to drive the cover door (12) to open the feeding port (111). The control unit further includes a timing module for starting timing when the first control signal is issued, and issuing a second control signal to control the opening / closing driving member (13) to drive the cover door (12) to close the feeding port (111) after the timing duration reaches the feeding duration.

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