Aluminum alloy fixed-point continuous casting system

Abstract

The invention relates to an aluminum alloy fixed-point continuous casting system which comprises two mounting seats, a filter frame and a ceramic filter screen, the ceramic filter screen is divided into two filter areas, and a power device used for driving the filter frame to reciprocate so as to enable the two filter areas to be sequentially aligned with a discharge port of a continuous casting machine is arranged on each mounting seat; a slag removal mechanism is arranged in the mounting seat, a detection mechanism for detecting the amount of slag floating on the ceramic filter screen is arranged on the mounting seat, and the detection mechanism, the power device and the slag removal mechanism are electrically connected with a slag removal controller; and the slag removal controller is configured to control the power device to drive the filter frame to move to another filter area to be aligned with a discharge port of the continuous casting machine when the detection mechanism detects that the amount of the scum in the filter area on the ceramic filter screen reaches a set value, and control the corresponding slag removal mechanism to remove the scum in the filter area. The detection mechanism monitors the amount of scum, the ceramic filter screen can be automatically controlled to switch the filter areas, the scum can be removed, and the casting quality of aluminum alloy can be ensured.

Description

Technical Field

[0001] This application relates to the technical field of metal casting, and in particular to an aluminum alloy fixed-point continuous casting system. Background Art

[0002] Aluminum alloy is an alloy prepared from pure aluminum and recycled aluminum as raw materials, and adding other elements such as silicon (Si), copper (Cu), magnesium (Mg), iron (Fe) according to international standards or special requirements to improve the deficiencies of pure aluminum in castability, chemical properties and physical properties. In actual production, in order to improve production efficiency, a casting machine is usually used in combination with a plate chain conveyor belt to transport molds for fixed-point continuous casting of aluminum alloy.

[0003] In the related technology, the Chinese patent with the application number CN202021479377.7 proposed an aluminum ingot continuous casting device, including a continuous casting machine and a diverter arranged on the continuous casting machine; the continuous casting machine includes a continuous casting machine frame, a plurality of mutually parallel continuous casting rotating shafts rotatably arranged on the continuous casting machine frame, an A driving wheel arranged on the continuous casting rotating shaft, an A driving belt drivingly connected to the A driving wheel, and a plurality of casting molds arranged on the A driving belt. This utility model can realize continuous casting to improve the casting efficiency, and can realize the recycling of tools, make the whole structure compact, reasonably control the moving time of tools and the cooling speed of aluminum products, and reduce the floor area of the equipment while meeting the production requirements.

[0004] The above-mentioned related technology has the following defects: when melting aluminum liquid, in addition to adding metal elements, it is also necessary to introduce inert gas to remove the dissolved gas in the aluminum liquid, and add some additives such as refining agents and modifiers to remove impurities in the aluminum liquid or improve the microstructure and mechanical properties of the aluminum alloy; however, these additives will react with oxides or other elements in the aluminum liquid to form compounds insoluble in the aluminum liquid, and the impurities will be brought to the surface of the aluminum liquid by the inert gas to form dross; at present, it is mainly through manual use of a skimming ladle to manually or mechanically skim the dross on the surface of the aluminum liquid, which has certain safety hazards and is difficult to completely remove these dross, thus affecting the casting quality of the aluminum alloy. Summary of the Invention

[0005] In order to improve the problem that it is difficult to completely remove impurities in aluminum liquid before casting, which affects the casting quality, this application provides an aluminum alloy fixed-point continuous casting system.

[0006] An aluminum alloy fixed-point continuous casting system provided by this application adopts the following technical solutions: An aluminum alloy fixed-point continuous casting system includes a continuous casting machine, a diverter, a plate chain conveyor belt, and a casting mold. There are two mounting seats arranged on both sides of the outlet of the continuous casting machine and the diverter. A filter frame is reciprocally slidably arranged between the two mounting seats. A ceramic filter screen is embedded in the filter frame. The ceramic filter screen is divided into two filter areas. A power device is arranged on the mounting seat to drive the filter frame to reciprocate so that the two filter areas are sequentially aligned with the outlet of the continuous casting machine. A slag removal mechanism for removing slag from the ceramic filter screen entering it is arranged in the mounting seat. A detection mechanism for detecting the amount of floating slag on the ceramic filter screen is arranged on the mounting seat. The detection mechanism is electrically connected to a slag removal controller. The slag removal controller is electrically connected to both the power device and the slag removal mechanism. The slag removal controller is configured to, when the detection mechanism detects that the amount of floating slag in one of the filter areas on the ceramic filter screen reaches a set value, control the power device to drive the filter frame to move to the other filter area to align with the outlet of the continuous casting machine, and control the corresponding slag removal mechanism to remove the floating slag on this one of the filter areas.

[0007] Furthermore, through slots are respectively formed through the opposite sides of the two mounting seats. Four upper rollers and four lower rollers are respectively rotatably mounted on the upper and lower slot walls of the through slots of the mounting seat at the four corners of the mounting seat. The filter frame is slidably arranged between the four upper rollers and the four lower rollers.

[0008] Furthermore, the power device includes: A fixed rack, fixedly connected to the long side of the filter frame; A movable rack, elastically arranged on the long side of the filter frame and correspondingly arranged with the fixed rack; A half gear, rotatably mounted on one of the mounting seats and located between the fixed rack and the movable rack and meshing with both of them; A power motor for driving the half gear to rotate; and A switching mechanism for driving the movable rack to approach the fixed rack to enter the reciprocating mode, and for driving the movable rack to move away from the fixed rack to enter the transverse movement mode; When in the reciprocating mode, when the half gear rotates, it alternately meshes with the fixed rack and the movable rack to make the filter frame perform reciprocating motion; When in the transverse movement mode, when the half gear rotates, it only intermittently meshes with the fixed rack to make the filter frame intermittently move transversely.

[0009] Furthermore, the switching mechanism includes: The limit frame is fixedly connected to the side of the filter frame, and the side thereof close to the fixed rack is open, and the movable rack is slidably arranged in the limit frame; A plurality of tension springs, one end of each tension spring is fixedly connected to the end of the movable rack away from the fixed rack, and the other end is fixedly connected to the closed end of the limit frame; A plurality of permanent magnets are fixedly connected to the side of the movable rack away from the fixed rack; and A plurality of electromagnets are provided and correspond to the plurality of permanent magnets one by one. The electromagnets are fixedly connected to the closed end of the limit frame. After the electromagnets are energized, they repel the permanent magnets magnetically. The electromagnets are electrically connected to the slag removal controller; When in the reciprocating mode, the electromagnets are energized; when in the transverse movement mode, the electromagnets are de-energized.

[0010] Further, two limit blocks are fixedly connected to the open end of the limit frame and are arranged at both ends of the movable rack. When the end of the movable rack abuts against the limit block, the half gear intermittently meshes with the movable rack when rotating.

[0011] Further, the detection mechanism includes: The mounting plate is elastically arranged on the bottom wall of the groove at the end of the through groove close to the other mounting seat. Two lower rollers close to the other mounting seat are mounted on the upper end surface of the mounting plate; The pressure sensor and a plurality of buffer elastic members are arranged between the lower end surface of the mounting plate and the bottom wall of the through groove; The slag removal controller is configured to control the power device to work to switch the filter area when the pressure value detected by the pressure sensor is greater than the first threshold.

[0012] Further, the size of the filter area in the length direction of the filter frame is greater than the distance between the two pressure sensors on the two mounting seats; the distance between the upper roller and the lower roller at the same end away from the middle of the filter frame is greater than the thickness of the filter frame.

[0013] Further, the pressure sensor is electrically connected to a recheck controller, and the recheck controller is electrically connected to the power motor. The recheck controller is configured to control the power motor to stop for a set time when the pressure value detected by the pressure sensor is greater than the first threshold; After the set time, if the pressure value detected by the pressure sensor is still greater than or equal to the first threshold, the slag removal controller is triggered; if the pressure value detected by the pressure sensor is less than the first threshold, the power motor is controlled to restart; The priority of the recheck controller is higher than the priority of the slag removal controller.

[0014] Further, the detection mechanism is arranged as follows: An industrial camera for capturing images of the working filtration area on the ceramic filter mesh; An image recognition and processing system for processing the images captured by the industrial camera and identifying whether the spreading area of the molten aluminum on the filtration area has expanded to a set value; if it is recognized that the spreading area has expanded to the set value, a signal is output to the slag removal controller, and the slag removal controller controls the power device to operate to switch the filtration area.

[0015] Further, the slag removal mechanism includes: A spray head connected to an external lye source and pointing to the filtration area entering the mounting seat; A brush fixed on the mounting seat, with its bristles abutting against the upper surface of the ceramic filter mesh, and the bristles are made of acid and alkali resistant materials; and A collection box fixed on the mounting seat, with its upper opening facing the spray head.

[0016] In summary, the beneficial technical effects of the present application are as follows: 1. When continuously casting aluminum alloy at a fixed point, the detection mechanism monitors the amount of dross on the filtration area of the ceramic filter mesh in the filtration state in real time. Once it is detected that the amount of dross on it exceeds the set value, the slag removal controller controls the power device to drive the filter frame to move horizontally, so that another filtration area is aligned with the discharge port of the continuous casting machine to continue filtering, without interrupting the casting process, realizing the automatic switching of the filtration area of the ceramic filter mesh; after the transferred filtration area enters the corresponding mounting seat, the dross on the part of the ceramic filter mesh where this filtration area is located is dissolved and brushed under the dual action of the lye spray head and the brush, so as to prevent the dross from blocking the ceramic filter mesh and affecting the passing amount of the molten aluminum, resulting in the uncontrollable casting amount in the casting mold. Therefore, not only the casting quality of the aluminum alloy can be ensured, but also a relatively balanced casting amount in each casting mold can be ensured; 2. When the amount of scum in the filtering area during filtering on the ceramic filter net reaches the set value, the slag removal controller controls multiple electromagnets to be powered off simultaneously, and the movable rack disengages from the meshing with the semi-gear to enter the transverse movement mode. At this time, when the semi-gear rotates, the filtering frame moves unidirectionally through the fixed rack, so that another filtering area of the ceramic filter net moves below the discharge port of the continuous casting machine, and the power motor can keep working continuously without stopping. Then the electromagnet is powered on, and the movable rack approaches the fixed rack and enters the reciprocating mode. At this time, when the semi-gear rotates, it meshes with the fixed rack and the movable rack alternately, so that the filtering frame drives the ceramic filter net to perform reciprocating motion to achieve efficient filtering of the scum in the molten aluminum. Thus, only by the power on and off of the electromagnet can the ceramic filter net be freely switched between the reciprocating mode and the transverse movement mode. Compared with using a servo motor to frequently rotate forward and backward to realize the reciprocating mode work and the switching of different modes, it will cause the servo motor to overheat and be damaged after long-term work. The power motor of the present application can keep rotating unidirectionally for a long time, and the damage to the power motor after long-term work is smaller, and it is easier to control and maintain; 3. When the detection mechanism is set as a pressure sensor, the pressure sensor detects the impact force of the molten aluminum on the ceramic filter net in real time. When the pressure value reaches the set first threshold, it will trigger the slag removal controller to work to switch the filtering area. And by introducing a recheck controller with a higher control priority, and fitting the first pressure value curve detected when no molten aluminum is passed under the same frequency state and the second pressure value curve detected in real time when filtering molten aluminum, eliminating the interference of the peak points on the first pressure value curve to the corresponding point values of the second pressure value curve, the detection error of the pressure sensor caused by the reciprocating transverse movement of the filtering frame can be eliminated to achieve precise control of the slag removal controller; 4. When the detection mechanism is set as an industrial camera, the industrial camera captures the image of the working filtering area on the ceramic filter net, and then the image recognition and processing system processes the image captured by the industrial camera and identifies whether the spreading area of the molten aluminum on the filtering area expands to the set value. If it is recognized that the spreading area expands to the set value, a signal is output to the slag removal controller, and the slag removal controller controls the power device to work to switch the filtering area, which can also realize non-contact detection and ensure the service life of the detection element. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the top view of the overall structure of the embodiment of the present application; Figure 2 is the schematic diagram of the overall structure of the ceramic filter net and the mounting seat of the embodiment of the present application; Figure 3 is along Figure 2 the sectional view structure diagram of the A-A line in Figure 4 is the partial sectional view structure diagram of the ceramic filter net and the mounting seat of the embodiment of the present application; Figure 5 is Figure 2 a partial enlarged schematic view of part B in Figure 6 is Figure 3 a partial enlarged schematic view of part C in

[0018] Description of reference numerals: 1. Continuous casting machine; 11. Divider 2. Plate chain conveyor belt; 21. Casting mold 3. Mounting seat; 31. Through groove; 32. Upper roller; 33. Lower roller 41. Filter frame; 411. Slide groove; 42. Ceramic filter screen; 421. Filter area 51. Fixed rack; 52. Movable rack; 53. Half gear; 54. Power motor 61. Limit frame; 62. Tension spring; 63. Permanent magnet; 64. Electromagnet; 65. Limit block; 66. Limit post 71. Mounting plate; 72. Pressure sensor; 73. Buffer elastic member 81. Spray head; 82. Brush Detailed implementation manners

[0019] Next, the technical solutions of the present application will be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0020] An embodiment of the present application discloses an aluminum alloy fixed-point continuous casting system. Referring to Figure 1 , Figure 2 and Figure 3 , it includes a continuous casting machine 1, a divider 11, a plate chain conveyor belt 2 and a casting mold 21. There are two mounting seats 3 arranged on both sides of the outlet of the continuous casting machine 1 and the divider 11. A filter frame 41 is reciprocally slidably arranged between the two mounting seats 3. The filter frame 41 can be horizontally arranged or inclined in the direction of the outlet of the continuous casting machine 1. A ceramic filter screen 42 is embedded in the filter frame 41. The ceramic filter screen 42 is divided into two left and right filter areas 421. A power device is arranged on the mounting seat 3 for driving the filter frame 41 to reciprocate so that the two filter areas 421 are sequentially aligned with the outlet of the continuous casting machine 1.

[0021] The mounting base 3 is provided with a slag removal mechanism for removing slag from the ceramic filter net 42 entering it, and the mounting base 3 is provided with a detection mechanism for detecting the amount of floating slag on the ceramic filter net 42. The detection mechanism is electrically connected to a slag removal controller, and the slag removal controller is electrically connected to both the power device and the slag removal mechanism; The slag removal controller is configured to control the power device to drive the filter frame 41 to move to align another filter area 421 with the discharge port of the continuous casting machine 1 when the detection mechanism detects that the amount of floating slag in one of the filter areas 421 on the ceramic filter net 42 reaches the set value, and control the corresponding slag removal mechanism to remove the floating slag on this one of the filter areas 421.

[0022] When specifically setting, referring to Figure 2 、 Figure 3 and Figure 4 Both opposite sides of the two mounting seats are penetrated with through grooves 31. The mounting base 3 is respectively rotatably installed with four upper rollers 32 and four lower rollers 33 at the four corners of the mounting base 3 on the upper and lower groove walls of the through groove 31. The filter frame 41 is slidably arranged between the four upper rollers 32 and the four lower rollers 33; in order to improve the stability of the filter frame 41 when sliding, sliding grooves 411 can also be opened on the upper and lower end faces of the filter frame 41 along its length direction, and the upper rollers 32 and the lower rollers 33 respectively roll in the corresponding sliding grooves 411.

[0023] In this way, when continuously casting aluminum alloy at a fixed point, the continuous casting machine 1 pours the high-temperature aluminum liquid out of its discharge port at a constant speed and passes through the ceramic filter net 42 and then enters the diverter 11. The diverter 11 cooperates with the plate chain conveyor belt 2 to continuously cast multiple casting molds; during this process, the ceramic filter net 42 can effectively filter the floating slag in the aluminum liquid to avoid the floating slag remaining when the slag is not completely skimmed in the previous process from being cast into the casting mold 21. Among them, the detection mechanism also monitors the amount of floating slag on the filter area 421 on the ceramic filter net 42 in the filtering state in real time. Once it detects that the amount of floating slag on it exceeds the set value, the slag removal controller controls the power device to drive the filter frame 41 to move horizontally so that another filter area 421 is aligned with the discharge port of the continuous casting machine 1 to continue filtering without interrupting the casting process; after the transferred filter area 421 enters the corresponding mounting base 3, the floating slag on the part of the ceramic filter net 42 where this filter area 421 is located is removed under the action of the slag removal mechanism, so as to prevent the floating slag from blocking the ceramic filter net 42 and affecting the aluminum liquid passing amount, resulting in the inability to control the casting amount in the casting mold 21. Thus, not only can the casting quality of the aluminum alloy be ensured, but also a relatively balanced casting amount in each casting mold 21 can be ensured.

[0024] Specifically, to further make full use of the filtering effect of the ceramic filter net 42.

[0025] Referring to Figure 4 and Figure 5, the above-mentioned power device comprises: The fixed rack 51 is fixedly connected to the long side of the filter frame 41 and arranged along the length direction of the filter frame 41; The movable rack 52 is elastically arranged on the long side of the filter frame 41 and is arranged corresponding to the fixed rack 51. The movable rack 52 is parallel to the fixed rack 51 and the teeth are arranged opposite to each other. The half gear 53 is rotatably mounted on one of the mounting seats 3 and is located between the fixed rack 51 and the movable rack 52 and meshes with the two; A power motor 54, used for driving the half gear 53 to rotate, and the power motor 54 is specifically a servo motor with a reducer; and A switching mechanism, used to drive the movable rack 52 close to the fixed rack 51 to enter a reciprocating mode, and used to drive the movable rack 52 away from the fixed rack 51 to enter a traverse mode; When in the reciprocating mode, the half gear 53 rotates and meshes with the fixed rack 51 and the movable rack 52 in turn to make the filter frame 41 reciprocate; When in the traverse mode, the half gear 53 rotates and only intermittently meshes with the fixed rack 51 to intermittently traverse the filter frame 41 .

[0026] Among them, refer to Figure 4 and Figure 5 , the switching mechanism includes: The limiting frame 61 is fixedly connected to the side of the filter frame 41, and the side close to the fixed rack 51 is open, and the movable rack 52 is slidably arranged in the limiting frame 61; A plurality of tension springs 62 are provided, one end of which is fixedly connected to an end of the movable rack 52 away from the fixed rack 51, and the other end is fixedly connected to a closed end of the limit frame 61; A plurality of permanent magnets 63 are provided and fixed to a side of the movable rack 52 away from the fixed rack 51; and There are multiple electromagnets 64, which correspond to the multiple permanent magnets 63 one by one. The electromagnets 64 are fixed to the closed end of the limit frame 61. When the electromagnets 64 are energized, the magnetic force of the permanent magnets 63 repel each other. The electromagnets 64 are electrically connected to the slag removal controller. When in the reciprocating mode, the electromagnet 64 is energized; when in the traverse mode, the electromagnet 64 is de-energized.

[0027] Moreover, two limit blocks 65 are fixedly connected to the open end of the limit frame 61, and are respectively arranged at two ends of the movable rack 52. When the end of the movable rack 52 abuts against the limit block 65, the semi-gear 53 intermittently meshes with the movable rack 52 during rotation. A plurality of limit posts 66 are fixedly connected to the closed end of the limit clip. When the movable rack 52 retracts under the elastic force of a plurality of tension springs 62, the back surface of the movable rack 52 abuts against the limit posts 66. At this time, there is a gap between the electromagnet 64 and the permanent magnet 63, so as to prevent damage caused by collision between the two when the movable rack 52 retracts.

[0028] Thus, when the casting system of the present application is working, first energize a plurality of electromagnets 64 and then start the power motor 54. After the plurality of electromagnets 64 are energized, a magnetic repulsive force is generated between the electromagnets 64 and the permanent magnets 63, so that the movable rack 52 slides in the direction close to the fixed rack 51 until its two ends are tightly abutted against the two limit blocks 65. At this time, the semi-gear 53 is located between the fixed rack 51 and the rack and meshes with the two respectively during rotation. After the power motor 54 drives the semi-gear 53 to rotate, when the tooth part on the semi-gear 53 meshes with the fixed rack 51, as the semi-gear 53 rotates, the fixed rack 51 and the filter frame 41 can be pushed to slide to one side; as the semi-gear 53 continues to rotate, the tooth part on the semi-gear 53 meshes with the movable rack 52. At this time, as the semi-gear 53 rotates, the movable rack 52 and the filter frame 41 can be pushed to slide to the other side. Thus, each rotation of the semi-gear 53 can drive the filter frame 41 to perform a reciprocating motion. Therefore, in the reciprocating mode, the filter frame 41 drives the ceramic filter screen 42 to reciprocate between the two mounting seats 3, so that different parts of the filtering area 421 of the ceramic filter screen 42 can filter the molten aluminum in turn. This can not only improve the filtering effect of the ceramic filter screen 42 on the molten aluminum, expand the filterable area of the ceramic filter screen 42, but also avoid the increase in the probability of blockage and the aggravation of damage caused by long-term local filtering of the ceramic filter screen 42.

[0029] When the detection mechanism detects that the amount of floating slag in the filtration area 421 of the ceramic filter screen 42 during filtration reaches the set value, the slag removal controller controls multiple electromagnets 64 to be powered off simultaneously. At this time, the magnetic repulsion force between the electromagnet 64 and the permanent magnet 63 disappears, and the movable rack 52 moves away from the fixed rack 51 under the elastic deformation force of multiple tension springs 62. When the half gear 53 rotates, it can only intermittently engage with the fixed rack 51. Thus, in the transverse movement mode, by controlling the rotation direction and the number of rotation turns of the half gear 53 driven by the power motor 54, the fixed rack 51 can be driven to drive the filter frame 41 to move in one direction until the other filtration area 421 of the ceramic filter screen 42 is moved to align with the discharge port of the continuous casting machine 1, so as to realize the switching of the filtration area 421. After the switching of the filtration area 421 is completed, the electromagnet 64 is continuously powered on, and the ceramic filter screen 42 re-enters the reciprocating mode, and the ceramic filter screen 42 continuously filters the molten aluminum in the reciprocating movement state.

[0030] Thus, only by the power on and off of the electromagnet 64 can the free switching of the ceramic filter screen 42 between the reciprocating mode and the transverse movement mode be realized, which causes less damage to the power motor 54 after long-term operation and is easier to control and maintain.

[0031] In order to facilitate the detection of the amount of floating slag on the ceramic filter screen 42.

[0032] In a feasible embodiment, referring to Figure 3 and Figure 6 , the detection mechanism includes: The mounting plate 71 is elastically arranged on the bottom wall of the through groove 31 near one end of the other mounting seat 3, and two lower rollers 33 close to the other mounting seat 3 are mounted on the upper end surface of the mounting plate 71; The pressure sensor 72 and multiple buffer elastic members 73 are arranged between the lower end surface of the mounting plate 71 and the bottom wall of the through groove 31; The slag removal controller is configured to control the power device to work to switch the filtration area 421 when the pressure value detected by the pressure sensor 72 is greater than the first threshold; the setting of the first threshold is based on the actual production setting and is determined by the upward floating of the pressure value detected when the ceramic filter screen 42 is impacted by molten aluminum with the same flow rate in the initial stage of filtration.

[0033] The dimension of the filtering area 421 along the length direction of the filtering frame 41 is greater than the distance between the two pressure sensors 72 on the two mounting seats 3, so that no matter which filtering area 421 of the ceramic filter screen 42 is switched to the filtering state, the filtering frame 41 can contact the lower roller 33 provided with the pressure sensor 72 to ensure the pressure detection of the filtering frame 41 against the impact of molten aluminum by the two pressure sensors 72; the distance between the upper roller 32 and the lower roller 33 at the same end away from the middle of the filtering frame 41 is greater than the thickness of the filtering frame 41 to ensure that when the ceramic filter screen 42 is impacted by molten aluminum, the filtering frame 41 can have a certain degree of horizontal displacement, so that the pressure sensors 72 on the two mounting seats 3 can accurately detect the filtering frame 41.

[0034] Thus, when the molten aluminum falling from the discharge port of the continuous casting machine 1 impacts on the ceramic filter screen 42, the ceramic filter screen 42 will bear a certain impact force. When the molten aluminum flow rate is constant, this impact force remains basically stable. However, once there is a large amount of floating slag on the ceramic filter screen 42, it will cause the molten aluminum to not pass through the ceramic filter screen 42 quickly, so that a part of the molten aluminum accumulates on the ceramic filter screen 42, increasing the actual contact area between the ceramic filter screen 42 and the falling rainwater. Therefore, as the molten aluminum continues to fall, the impact force of the molten aluminum borne by the ceramic filter screen 42 will increase significantly. Specifically, on the pressure sensor 72, the pressure value detected on the pressure sensor 72 will have an obvious and continuous increasing trend compared with the initial value. Therefore, by means of the increasing trend of the pressure value detected by the pressure sensor 72, the amount of floating slag or the blockage condition on the ceramic filter screen 42 can be intuitively reflected. When the pressure value reaches the set first threshold, the slag removal controller will be triggered to work to switch the filtering area 421.

[0035] This detection method enables the detection element not to be in direct contact with the high-temperature molten aluminum and the ceramic filter screen 42 directly, which can ensure the service life of the detection element on the basis of the detection accuracy.

[0036] Considering that in the reciprocating mode, when the power motor 54 drives the semi-gear 53 to rotate, during the process of the semi-gear 53 pushing the fixed rack 51 or the movable rack 52, a certain vertical force will be applied to the filtering frame 41, which may increase the pressure value detected by the pressure sensor 72 and cause the slag removal controller to be mis-triggered.

[0037] For this reason, the pressure sensor 72 is electrically connected to a re-inspection controller, and the re-inspection controller is electrically connected to the power motor 54. The re-inspection controller is configured to control the power motor 54 to stop for a set time when the pressure value detected by the pressure sensor 72 is greater than the first threshold. At this time, the filtering frame 41 is in a static state, which can eliminate the influence of the movement of the filtering frame 41 on the detection value of the pressure sensor 72.

[0038] After the set time, if the pressure value detected by the pressure sensor 72 is still greater than or equal to the first threshold, it means that the amount of scum on the ceramic filter screen 42 has reached the set value, and then the slag removal controller is triggered; if the pressure value detected by the pressure sensor 72 is less than the first threshold, it may be that the movement of the filter frame 41 causes fluctuations in the detection value of the pressure sensor 72. At this time, the power motor 54 is controlled to restart so that the ceramic filter screen 42 re-enters the reciprocating mode to avoid increasing energy consumption due to frequent switching of the filtration area 421.

[0039] The priority of the re-inspection controller is higher than that of the slag removal controller. That is, only when the pressure value detected when the ceramic filter screen 42 is in a stationary state is greater than the first threshold, it will be determined that the amount of scum on the ceramic filter screen 42 has reached the set value, and the control of the slag removal controller will be triggered to avoid frequent lateral movement of the filter frame 41 to switch the filtration area 421 and affect the working life of the slag removal mechanism.

[0040] In addition, it should be further clarified that when setting the first threshold, the influence of the reciprocating mode of the ceramic filter screen 42 on the detection value of the pressure sensor 72 needs to be considered synchronously. For example, when there is no molten aluminum, the power device is started in the reciprocating mode, and the detection values of the pressure sensor 72 are recorded and a first pressure value curve is plotted. For example, when the half gear 53 rotates to engage with the lower moving rack 52, the detection value of the pressure sensor 72 may increase, and when the half gear 53 rotates to engage with the upper fixed rack 51, the detection value of the pressure sensor 72 may decrease; subsequently, the pressure value when the ceramic filter screen 42 is impacted by molten aluminum with the same flow rate as during production at the initial stage of filtration is detected and recorded, and a second pressure value curve is made synchronously. The first pressure value curve and the second pressure value curve with the same frequency are fitted, and the interference of each peak point on the first pressure value curve on the corresponding point value of the second pressure value curve is eliminated, and the numerical trend detected by the pressure sensor 72 when the ceramic filter screen 42 is in the normal working state can be obtained. From this numerical trend, the first threshold can be accurately set.

[0041] In another feasible embodiment, the amount of scum on the ceramic filter screen 42 can also be detected based on vision detection technology.

[0042] Specifically, the detection mechanism is set as: An industrial camera (not shown in the figure) is used to capture the image of the working filtration area 421 on the ceramic filter screen 42, which can specifically be a thermal imaging camera or an ordinary CCD camera; An image recognition processing system is used to process the images captured by an industrial camera and identify whether the spreading area of molten aluminum on the filtering area 421 has expanded to a set value. If it is recognized that the spreading area has expanded to the set value, a signal is output to the slag removal controller, and the slag removal controller controls the power device to work to switch the filtering area 421. The specific processing logic of the image recognition processing system is based on existing image processing technologies, which are conventional technical means and will not be elaborated here.

[0043] The principle is that once a certain amount of dross accumulates on the ceramic filter 42, these dross will interfere with the molten aluminum falling from above passing through the ceramic filter 42, causing the rate of the molten aluminum passing through the ceramic filter 42 to slow down. Since the flow rate of the molten aluminum at the discharge port on the continuous casting machine 1 is constant, therefore, part of the molten aluminum will accumulate on the ceramic filter 42 and spread to the periphery under the impact of the continuously falling molten aluminum, resulting in the expansion of the high-temperature and high-brightness area in the filtering area 421 on the ceramic filter 42, or the appearance of dross shadows. These abnormal conditions can all be captured by the industrial camera and recognized by the image recognition processing system. When the spreading area on the filtering area 421 expands to the set value, it triggers the slag removal controller to work, causing the power device to work to switch the filtering area 421. Thus, through visual processing technology, non-contact detection can also be achieved, ensuring the service life of the detection element.

[0044] And in order to effectively remove the dross on the ceramic filter 42, referring to Figure 3 and Figure 6 , the above-mentioned slag removal mechanism includes: A spray head 81, which is connected to an external alkali solution source and has a solenoid valve connected to its pipeline, such as sodium carbonate solution or sodium bicarbonate solution, and the alkali solution sprayed by the spray head 81 is directed at the filtering area 421 on the ceramic filter 42 that enters the mounting seat 3. And when specifically set, the spray head 81 can be fixedly inclined in the mounting seat 3 or can be rotatably arranged in the mounting seat 3, and the pipeline of the spray head 81 is driven by a servo motor to swing reciprocally to spray a larger area of the ceramic filter 42.

[0045] A brush 82, which is fixedly connected to the mounting seat 3, and its bristles are in contact with the upper surface of the ceramic filter 42, and its bristles are made of acid and alkali resistant materials, such as stainless steel, nylon, etc. And A collection box (not shown in the figure), which is fixedly connected to the mounting seat 3, and its upper end opening is directly opposite to the spray head 81, and is used to collect the waste water that has washed the dross on the ceramic filter 42.

[0046] After the power device switches the filtration area 421, the filtration area 421 of the ceramic filter screen 42 carrying dross moves below the spray head 81 in the corresponding mounting seat 3. The solenoid valve on the spray head 81 is opened, and the spray head 81 sprays lye into this filtration area 421, which can dissolve the dross. Moreover, when the ceramic filter screen 42 enters the reciprocating mode, the ceramic filter screen 42 follows the filter frame 41 and moves horizontally back and forth under the drive of the power device, so that the brush 82 also reciprocates relative to the ceramic filter screen 42. Thus, the brush 82 can continue to brush the dross on the ceramic filter screen 42. Combined with the flushing of the lye sprayed by the spray head 81, the dross on the ceramic filter screen 42 can be fully removed. After the spray head 81 sprays lye for a certain period of time, the solenoid valve on it is closed to save lye, and the brush 82 continues to brush the ceramic filter screen 42 with the continuous reciprocating movement of the filter frame 41 until the filtration area 421 during filtration is also blocked and needs to switch the filtration area 421.

[0047] The implementation principle of an aluminum alloy fixed-point continuous casting system according to an embodiment of the present application is as follows: When performing fixed-point continuous casting of aluminum alloy, the continuous casting machine 1 evenly pours the high-temperature aluminum liquid from its discharge port and passes it through the ceramic filter screen 42. The ceramic filter screen 42 effectively filters the dross in the aluminum liquid to prevent the dross remaining when skimming is not thorough in the previous process from being cast into the casting mold 21. Among them, the detection mechanism monitors the amount of dross on the filtration area 421 of the ceramic filter screen 42 in the filtration state in real time. Once it detects that the amount of dross on it exceeds the set value, the slag removal controller controls the power device to drive the filter frame 41 to move horizontally, so that another filtration area 421 is aligned with the discharge port of the continuous casting machine 1 to continue filtration without interrupting the casting process. After the transferred filtration area 421 enters the corresponding mounting seat 3, the dross on the part of the ceramic filter screen 42 where this filtration area 421 is located is dissolved and brushed under the dual action of the lye spray head 81 and the brush 82, so as to prevent the dross from blocking the ceramic filter screen 42 and affecting the aluminum liquid throughput, resulting in the inability to control the casting amount in the casting mold 21. Thus, not only can the casting quality of the aluminum alloy be ensured, but also a relatively balanced casting amount in each casting mold 21 can be ensured.

[0048] Among them, when the amount of scum on the filtering area 421 being filtered on the ceramic filter screen 42 reaches the set value, the slag removal controller controls multiple electromagnets 64 to be powered off simultaneously, and the movable rack 52 disengages from the meshing with the half gear 53 to enter the transverse movement mode. At this time, when the half gear 53 rotates, the filtering frame 41 moves unidirectionally through the fixed rack 51, so that another filtering area 421 of the ceramic filter screen 42 moves below the discharge port of the continuous casting machine 1; then the electromagnet 64 is powered on, and the movable rack 52 approaches the fixed rack 51 and enters the reciprocating mode. At this time, when the half gear 53 rotates, it meshes with the fixed rack 51 and the movable rack 52 alternately, so that the filtering frame 41 drives the ceramic filter screen 42 to perform reciprocating motion to achieve efficient filtering of the scum in the molten aluminum; thus, only by the power on and off of the electromagnet 64 can the ceramic filter screen 42 be freely switched between the reciprocating mode and the transverse movement mode, which causes less damage to the power motor 54 after long-term operation and is easier to control and maintain.

[0049] Unless otherwise defined, the technical terms or scientific terms used in this application shall have the ordinary meanings understood by those of ordinary skill in the art to which this application belongs. The terms "first", "second", "third" and similar words used in the specification and claims of this application do not denote any order, quantity or importance, but are only used to distinguish different components. The words such as "a" or "an" do not denote a quantity limitation either, but mean that there is at least one. The words such as "comprising" or "including" mean that the elements or objects appearing before "comprising" or "including" cover the elements or objects listed after "comprising" or "including" and their equivalents, and do not exclude other elements or objects. The terms "upper", "lower", "left", "right" etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationships may also change accordingly.

[0050] The above are all the preferred embodiments of this application. Without restricting the protection scope of this application accordingly, therefore: all equivalent changes made according to the structure, shape and principle of this application shall be covered within the protection scope of this application.

Claims

1. An aluminum alloy fixed-point continuous casting system, comprising a continuous casting machine (1), a diverter (11), a plate chain conveyor belt (2) and a casting mold (21), characterized in that: Two mounting seats (3) are arranged on both sides of the discharge port of the continuous casting machine (1) and the diverter (11); a filter frame (41) is arranged between the two mounting seats (3) for reciprocating sliding; a ceramic filter screen (42) is embedded in the filter frame (41); the ceramic filter screen (42) is divided into two filter areas (421); and a power device is arranged on the mounting seat (3) for driving the filter frame (41) to reciprocate so that the two filter areas (421) are aligned with the discharge port of the continuous casting machine (1) in sequence; The mounting seat (3) is provided with a slag removal mechanism for removing slag from the ceramic filter screen (42) entering therein, and the mounting seat (3) is provided with a detection mechanism for detecting the amount of floating slag on the ceramic filter screen (42), the detection mechanism being electrically connected to a slag removal controller, and the slag removal controller being electrically connected to both the power device and the slag removal mechanism; The slag removal controller is configured to control the power device to drive the filter frame (41) to move to another filter area (421) to align with the discharge port of the continuous casting machine (1) when the detection mechanism detects that the amount of slag in one of the filter areas (421) on the ceramic filter screen (42) reaches a set value, and control the corresponding slag removal mechanism to remove the slag on the one of the filter areas (421).

2. The aluminum alloy fixed-point continuous casting system according to claim 1, characterized in that: Through slots (31) are formed through the opposite sides of the two mounting seats. Four upper rollers (32) and lower rollers (33) are rotatably mounted on the upper and lower slot walls of the through slot (31) of the mounting seat (3). The four upper rollers (32) and lower rollers (33) are arranged at the four corners of the mounting seat (3). The filter frame (41) is slidably arranged between the four upper rollers (32) and the four lower rollers (33).

3. The aluminum alloy fixed-point continuous casting system according to claim 2, characterized in that: The power unit comprises: A fixed rack (51) fixedly connected to the long side of the filter frame (41); A movable rack (52) is elastically arranged on the long side of the filter frame (41) and is arranged corresponding to the fixed rack (51); A half gear (53) is rotatably mounted on one of the mounting seats (3) and is located between the fixed rack (51) and the movable rack (52) and meshes with the two; a power motor (54), used for driving the half gear (53) to rotate; and a switching mechanism, used for driving the movable rack (52) to approach the fixed rack (51) to enter a reciprocating mode, and for driving the movable rack (52) to move away from the fixed rack (51) to enter a transverse movement mode; When in the reciprocating mode, the half gear (53) rotates and meshes with the fixed rack (51) and the movable rack (52) in turn to make the filter frame (41) reciprocate; When in the transverse movement mode, the half gear (53) only intermittently meshes with the fixed rack (51) when rotating to allow the filter frame (41) to intermittently transversely move.

4. The aluminum alloy fixed-point continuous casting system according to claim 3, characterized in that: The switching mechanism comprises: A limiting frame (61) is fixedly connected to a side of the filter frame (41), and a side thereof close to the fixed rack (51) is open, and the movable rack (52) is slidably arranged in the limiting frame (61); A plurality of tension springs (62) are provided, one end of which is fixedly connected to an end of the movable rack (52) away from the fixed rack (51), and the other end of which is fixedly connected to a closed end of the limiting frame (61); a permanent magnet (63), provided in plurality and fixedly connected to a side of the movable rack (52) facing away from the fixed rack (51); and A plurality of electromagnets (64) are provided and correspond one to one with the plurality of permanent magnets (63); the electromagnets (64) are fixed to the closed end of the limit frame (61); the electromagnets (64) repel the permanent magnets (63) by magnetic force when energized; and the electromagnets (64) are electrically connected to the slag removal controller; When in the reciprocating mode, the electromagnet (64) is energized; when in the traverse mode, the electromagnet (64) is de-energized.

5. The aluminum alloy fixed-point continuous casting system according to claim 4, characterized in that: The open end of the limit frame (61) is fixedly connected to two limit blocks (65) arranged at both ends of the movable rack (52); when the end of the movable rack (52) abuts against the limit blocks (65), the half gear (53) intermittently meshes with the movable rack (52) when rotating.

6. The aluminum alloy fixed-point continuous casting system according to any one of claims 3 to 5, characterized in that: The detection mechanism includes: A mounting plate (71) is elastically arranged on a bottom wall of the through slot (31) close to one end of the other mounting seat (3), and the two lower rollers (33) close to the other mounting seat (3) are mounted on an upper end surface of the mounting plate (71); A pressure sensor (72) and a plurality of buffer elastic members (73) are arranged between the lower end surface of the mounting plate (71) and the bottom wall of the through slot (31); The slag removal controller is configured to control the power device to operate so as to switch the filtering area (421) when the pressure value detected by the pressure sensor (72) is greater than a first threshold value.

7. The aluminum alloy fixed-point continuous casting system according to claim 6, characterized in that: The dimension of the filter area (421) along the length direction of the filter frame (41) is greater than the distance between the two pressure sensors (72) on the two mounting seats (3); and the distance between the upper roller (32) and the lower roller (33) at the same end and away from the middle of the filter frame (41) is greater than the thickness of the filter frame (41).

8. The aluminum alloy fixed-point continuous casting system according to claim 6, characterized in that: The pressure sensor (72) is electrically connected to a recheck controller, the recheck controller is electrically connected to the power motor (54), and the recheck controller is configured to control the power motor (54) to stop for a set time when the pressure value detected by the pressure sensor (72) is greater than a first threshold value; After the set time, if the pressure value detected by the pressure sensor (72) is still greater than or equal to the first threshold, the slag removal controller is triggered; if the pressure value detected by the pressure sensor (72) is less than the first threshold, the power motor (54) is controlled to restart; The priority of the recheck controller is greater than the priority of the slag removal controller.

9. The aluminum alloy fixed-point continuous casting system according to any one of claims 1 to 5, characterized in that: The detection mechanism is configured as follows: An industrial camera, used for capturing an image of the filter area (421) in operation on the ceramic filter screen (42); An image recognition processing system is used to process the image captured by the industrial camera and identify whether the spreading area of ​​the aluminum liquid on the filtering area (421) has expanded to a set value; if it is identified that the spreading area has expanded to the set value, a signal is output to the slag removal controller, and the slag removal controller controls the power device to operate so as to switch the filtering area (421).

10. The aluminum alloy fixed-point continuous casting system according to any one of claims 1 to 5, characterized in that: The slag removal mechanism comprises: A spray head (81) connected to an external alkali liquid source and directed toward the filter area (421) entering the mounting seat (3); a brush (82) fixedly connected to the mounting seat (3), with its bristles abutting against the upper surface of the ceramic filter screen (42), and the bristles being made of acid- and alkali-resistant material; and The collection box is fixedly connected to the mounting seat (3), and its upper end opening faces the spray head (81).

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