A multi-flux permanent magnet stirring device and method

Abstract

This invention discloses a multi-throughput permanent magnet stirring device and method. The device includes a sleeve, a permanent magnet, a permanent magnet rotation mechanism, an A tray, a B tray, a trolley, an annular track, an A telescopic rod, a B telescopic rod, and a control system. The sleeve is nested and assembled with the permanent magnet. The annular track is supported inside the sleeve by the B telescopic rod. The A tray is supported inside the sleeve by the A telescopic rod. The B tray is mounted on the trolley via the tray rotation mechanism. The trolley is slidably assembled with the annular track. Using the permanent magnet stirring device of this application, multiple melts can be stirred simultaneously, enabling diversified and multi-level permanent magnet stirring experiments. It has a simple structure, is easy to operate and maintain, and can be widely used in the field of permanent magnet stirring of metallurgical melts. It can also be used in experimental research, satisfying the needs of diversified laboratory research on the effects of permanent magnet stirring on melt solidification, microstructure, and properties, laying the foundation for future industrial applications.

Description

Technical Field

[0001] This invention relates to the field of metallurgical melt stirring technology, specifically to a multi-flux permanent magnet stirring device and method. Background Technology

[0002] Currently, three-phase AC electromagnetic stirrers have become the mainstream, effective, and standard continuous casting configuration for controlling billet quality. The application of electromagnetic stirring to the molten metal to control billet quality has attracted increasing attention from metallurgists.

[0003] However, electromagnetic stirring requires high-power variable frequency current to generate an alternating magnetic field, which presents a series of problems such as complex equipment, high energy consumption, and high maintenance costs. In addition, the stirrer must be cooled by pressurized flowing water, and even with high-quality cooling water, the lifespan of the coil is still relatively short.

[0004] With the rapid development of magnetic materials, permanent magnet stirring has become an effective alternative to electromagnetic stirring. Studies have shown that the energy consumption of permanent magnet stirring is only one-tenth that of electromagnetic stirring. However, permanent magnet materials generally face the problem of "demagnetization at high temperatures." When permanent magnet stirring operates at high speeds, it faces the dilemma of high-temperature cooling, which is also detrimental to the long-term stable operation of the drive mechanism. Existing technologies have produced some permanent magnet stirring devices. For example, patent CN110152545A discloses a continuous casting permanent magnet spiral magnetic field stirrer, which uses a spiral magnetic field composed of magnets arranged in a spiral pattern for magnetic field stirring. This requires 25-40 magnets, a relatively large number. Another example is patent CN208591780U, which discloses a permanent magnet stirrer that can effectively prevent segregation. It uses the rotation of propeller-shaped blades to drive the melt to move uniformly, but its structure is relatively complex and can only achieve a single magnetic field movement mode. In summary, existing permanent magnet stirring devices have relatively complex structures and limited magnetic field modes, which are not conducive to controlling and improving the quality of cast billets. Furthermore, when common permanent magnet stirring devices are used in experimental research, it is difficult to conduct diversified studies on the effects of permanent magnet stirring on melt solidification, microstructure, and properties. At the same time, it is only possible to control one type of permanent magnet stirring condition and conduct a single set of permanent magnet stirring experiments. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a multi-flux permanent magnet stirring device and method, enabling the device to simultaneously perform multiple sets of permanent magnet stirring experiments, and also to realize diversified and multi-level permanent magnet stirring experiments. It features a simple structure, convenient operation, and easy maintenance. It can be widely applied in the field of permanent magnet stirring of metallurgical melts, and can also be used in experimental research, satisfying the needs of diversified laboratory research on the effects of permanent magnet stirring on melt solidification, microstructure, and properties, laying the foundation for future industrial applications.

[0006] The present invention solves the above problems through the following technical means:

[0007] A multi-flux permanent magnet stirring device includes a sleeve, a permanent magnet, a permanent magnet rotation mechanism, an A tray, a B tray, a trolley, an annular track, an A telescopic rod, a B telescopic rod, and a control system. The sleeve is nested and assembled with the permanent magnet. The permanent magnet is driven to rotate by the permanent magnet rotation mechanism. The annular track is supported inside the sleeve by the B telescopic rod. The A tray is supported inside the sleeve by the A telescopic rod. The B tray is mounted on the trolley by the tray rotation mechanism. The trolley is slidably assembled with the annular track. The control system is electrically connected to the trolley, the A telescopic rod, the B telescopic rod, and the permanent magnet rotation mechanism. Both the A tray and the B tray can be used to place crucibles containing melt for permanent magnet stirring experiments.

[0008] Furthermore, the number of B trays is controlled between 1 and 4. The B trays are fixed on the trolley and can move periodically on the circular aisle.

[0009] Furthermore, trays A and B can move vertically by controlling their corresponding telescopic rods.

[0010] Furthermore, the movement of telescopic rod A and telescopic rod B can be performed independently.

[0011] Furthermore, the number of A telescopic rods is not less than 6, and the number of B telescopic rods is not less than 3.

[0012] Furthermore, the control system includes a permanent magnet rotation mechanism control module, a tray rotation mechanism control module, an A telescopic rod motion control module, a B telescopic rod motion control module, and a trolley motion control module.

[0013] Furthermore, the rotational speed of the permanent magnet is controlled at 0-200 r / min, the rotational speed of the B tray is controlled at 0-100 r / min, and the extension and retraction speeds of the A telescopic rod and the B telescopic rod are controlled at 0-2 m / min.

[0014] Furthermore, the method for stirring the melt using the aforementioned multi-flux permanent magnet stirring device is characterized by comprising the following steps:

[0015] S1: Place the crucible containing the research melt on trays A and B;

[0016] S2: Start the permanent magnet stirring device and adjust the permanent magnet stirring parameters, including the direction and speed of the permanent magnet, the trolley moving speed, the direction and speed of tray B, and the extension and retraction speed of telescopic rods A and B.

[0017] Depending on the melt characteristics and research needs, appropriate tray and permanent magnet stirring parameters can be selected. For a specific parameter, different values ​​can be set within a stirring cycle. For example, the permanent magnet can be selected to rotate forward-reverse-forward, and the corresponding rotation speeds can also be different. If a low stirring speed is required, the trolley can also be left stationary.

[0018] The beneficial effects of this invention are:

[0019] The apparatus and method of this application include multiple trays for holding molten materials, enabling simultaneous execution of multiple permanent magnet stirring experiments. Furthermore, it includes two types of trays, A and B, allowing for control of different permanent magnet stirring conditions. Moreover, this apparatus achieves multi-level and diversified control of the magnetic field at the location of the molten material through combined motion by controlling the rotational speed and direction of the permanent magnet and the trolley, as well as the raising and lowering of the tray positions. This overcomes the limitations of a single magnetic field motion mode, increases the rate of magnetic field change at the molten material, and significantly enhances the controllability of the cast billet quality.

[0020] For tray A, the horizontal rotation of the permanent magnet provides a rotating magnetic field, and the up-and-down movement of telescopic rod A provides a traveling wave magnetic field. The combined movement of the two provides a spiral magnetic field. For tray B, since it is far from the center of the two permanent magnets, the magnetic field at its location is in a state of uneven intensity, with one side higher than the other. The horizontal rotation of the permanent magnet provides a spiral magnetic field, and the combination of the horizontal rotation of the permanent magnet and the up-and-down movement of the telescopic rod provides a more complex and diverse magnetic field movement pattern. At the same time, tray B can rotate in the opposite direction to the permanent magnets along with the trolley, thereby increasing the rate of change of the magnetic field at the melt.

[0021] Compared to existing helical stirring devices that utilize the horizontal movement of multiple helically distributed magnets to generate a moving helical magnetic field, this device combines the horizontal movement of two permanent magnets with the up-and-down movement of a telescopic rod and the characteristics of the magnetic field distribution within the magnets. This combined motion generates a moving helical magnetic field, simplifying the experimental equipment and making magnetic field control more convenient and versatile, not limited to helical magnetic fields. Furthermore, this device can simultaneously conduct permanent magnet stirring experiments with various melts under multiple conditions, improving the efficiency of permanent magnet stirring devices. It can be used in experimental research fields, meeting the needs of diversified laboratory studies on the effects of permanent magnet stirring on melt solidification, microstructure, and properties. It has significant advantages such as simple structure, easy maintenance, low cost, and convenient operation. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a schematic diagram of a preferred embodiment of a multi-flux permanent magnet stirring device according to the present invention;

[0024] Figure 2 This is a top view of the area between the two permanent magnets.

[0025] In the diagram: 1--sleeve; 2--permanent magnet; 3--B tray; 4--cart; 5--circular walkway; 6--B telescopic rod; 7--permanent magnet rotation mechanism; 8--control system; 9--A tray; 10--A telescopic rod. Detailed Implementation

[0026] The present invention will be further described in detail below through embodiments. Through these descriptions, the features and advantages of the present invention will become clearer and more apparent. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them.

[0027] like Figures 1 to 2 As shown, the multi-throughput permanent magnet stirring device of this embodiment includes a sleeve 1, a permanent magnet 2, a permanent magnet rotation mechanism 7, an A tray 9, a B tray 3, a trolley 4, an annular track 5, an A telescopic rod 10, a B telescopic rod 6, and a control system 8. The sleeve is nested and assembled with the permanent magnet. The permanent magnet is driven to rotate by the permanent magnet rotation mechanism. The annular track is supported inside the sleeve by the B telescopic rod. The A tray is supported inside the sleeve by the A telescopic rod. The B tray is mounted on the trolley by the tray rotation mechanism. The trolley is slidably assembled with the annular track. The control system is electrically connected to the trolley, the A telescopic rod, the B telescopic rod, and the permanent magnet rotation mechanism. Both the A tray and the B tray can be used to place crucibles containing melt for permanent magnet stirring experiments. The control system includes a permanent magnet rotation mechanism control module, a tray rotation mechanism control module, an A telescopic rod motion control module, a B telescopic rod motion control module, and a trolley motion control module, which can control the rotational speed and direction of the permanent magnet, the rotational speed and direction of the trolley, and the speed of the telescopic rod.

[0028] In practical applications, crucibles containing the same or different melts can be placed on each tray to achieve multi-flux permanent magnet stirring experiments. Simultaneously, the rotation of the permanent magnet and tray B can be controlled by the control system. The Lorentz force excited by the moving magnetic field drives the melt movement. The rotational speed and direction of the permanent magnet and tray B can be controlled to study the effects of magnetic field speed, forward rotation, reverse rotation, and a combination of forward and reverse rotation on the melt solidification process. The raising and lowering of telescopic rods A and B can be controlled to adjust the magnetic field strength at the melt's location. Combined with the horizontal rotational motion of the permanent magnet, a helical magnetic field motion at the melt can be achieved through combined motion, allowing for the study of the effects of magnetic field strength and magnetic field motion patterns on the melt solidification process.

[0029] This embodiment also provides a method for stirring a melt using the above-mentioned multi-flux permanent magnet stirring device, comprising the following steps:

[0030] S1: Place the crucible containing the research melt on trays A and B;

[0031] S2: Start the permanent magnet stirring device and adjust the permanent magnet stirring parameters, including the direction and speed of the permanent magnet, the trolley moving speed, the direction and speed of tray B, and the extension and retraction speed of telescopic rods A and B.

[0032] Depending on the melt characteristics and research needs, appropriate tray and permanent magnet stirring parameters can be selected. For a specific parameter, different values ​​can be set within a stirring cycle. For example, the permanent magnet can be selected to rotate forward-reverse-forward, and the corresponding rotation speeds can also be different. If a low stirring speed is required, the trolley can also be left stationary.

[0033] To make the above method clearer, the following specific embodiments are provided for further explanation:

[0034] Example 1

[0035] The stirring apparatus consists of four B trays and one A tray. Five MgO crucibles containing sulfur-containing non-quenched and tempered steel melt are placed on different trays, and the permanent magnet stirring device is turned on. Alternating permanent magnet stirring is applied to the melt: the magnet rotates clockwise for 2 minutes and then counterclockwise for 2 minutes, while the trolley rotates counterclockwise for 2 minutes and then clockwise for 2 minutes, repeating this process. The stirring time is 20 minutes. During stirring, the A telescopic rod moves at a speed of 1 m / min, the B telescopic rod remains stationary, the magnet rotates clockwise at 100 r / min and counterclockwise at 80 r / min, and the trolley rotates clockwise at 20 r / min and counterclockwise at 50 r / min. After stirring, all ingots are removed and water-cooled to obtain samples.

[0036] Example 2

[0037] The stirring apparatus consists of three B trays and one A tray. Four MgO crucibles containing sulfur-containing non-quenched and tempered steel molten metal are placed on different trays, and the permanent magnet stirring device is turned on. The stirring time is 15 minutes. During the stirring process, the A telescopic rod moves at a speed of 1 m / min, the B telescopic rod moves at a speed of 0.5 m / min, the magnet rotates clockwise at a speed of 80 r / min, and the trolley remains stationary. After stirring is completed, the samples are removed after all ingots have air-cooled.

[0038] In summary, the device of this patent application includes multiple trays for holding molten materials, enabling simultaneous execution of multiple permanent magnet stirring experiments. Furthermore, it includes two types of trays, A and B, allowing for control of different permanent magnet stirring conditions. Moreover, this device achieves multi-level and diversified control of the magnetic field at the melt location through combined motion by controlling the rotational speed and direction of the permanent magnets and the trolley, as well as the raising and lowering of the trays. This overcomes the limitations of a single magnetic field motion mode, increases the rate of magnetic field change at the melt, and significantly enhances the controllability of the cast billet quality.

[0039] For tray A, the horizontal rotation of the permanent magnet provides a rotating magnetic field, and the up-and-down movement of the telescopic rod provides a traveling wave magnetic field. The combined motion of the two provides a helical magnetic field. For tray B, since it is far from the center of the two magnets, the magnetic field at its location is in a state of uneven intensity, with one side higher than the other. The horizontal rotation of the permanent magnet provides a helical magnetic field, and the combination of the horizontal rotation of the permanent magnet and the up-and-down movement of the telescopic rod provides a more complex and diverse magnetic field motion pattern. At the same time, tray B can rotate in the opposite direction to the permanent magnet along with the trolley, thereby increasing the rate of change of the magnetic field at the melt.

[0040] Compared to existing helical stirring devices that utilize the horizontal movement of multiple helically distributed magnets to generate a moving helical magnetic field, this device combines the horizontal movement of two permanent magnets with the up-and-down movement of a telescopic rod and the characteristics of the magnetic field distribution within the magnets. This combined motion generates a moving helical magnetic field, simplifying the experimental equipment and making magnetic field control more convenient and versatile, not limited to helical magnetic fields. Furthermore, this device can simultaneously conduct permanent magnet stirring experiments with various melts under multiple conditions, improving the efficiency of permanent magnet stirring devices. It can be used in experimental research fields, meeting the needs of diversified laboratory studies on the effects of permanent magnet stirring on melt solidification, microstructure, and properties. It has significant advantages such as simple structure, easy maintenance, low cost, and convenient operation.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A multi-flow permanent magnet stirring device, characterized in that: The system includes a sleeve (1), a permanent magnet (2), a permanent magnet rotating mechanism (7), an A tray (9), a B tray (3), a trolley (4), a circular walkway (5), an A telescopic rod (10), a B telescopic rod (6), and a control system (8). The sleeve is nested and assembled with the permanent magnet. The permanent magnet is driven to rotate by the permanent magnet rotating mechanism. The circular walkway is supported and set inside the sleeve by the B telescopic rod. The A tray is supported and set inside the sleeve by the A telescopic rod. The B tray is set on the trolley by the tray rotating mechanism. The trolley is slidably assembled with the circular walkway. The control system is electrically connected to the trolley, the A telescopic rod, the B telescopic rod, and the permanent magnet rotating mechanism.

2. The multi-flow permanent magnet stirring device according to claim 1, characterized in that: The number of B trays and trolleys is controlled between 1 and 4.

3. The multi-flow permanent magnet stirring device according to claim 1, characterized in that: The number of A telescopic rods shall not be less than 6, and the number of B telescopic rods shall not be less than 3.

4. The multi-flow permanent magnet stirring device according to claim 1, characterized in that: The control system includes a permanent magnet rotation mechanism control module, a tray rotation mechanism control module, an A telescopic rod motion control module, a B telescopic rod motion control module, and a trolley motion control module.

5. The multi-flow permanent magnet stirring device according to claim 1, characterized in that: The rotational speed of the permanent magnet is controlled at 0-200 r / min, the rotational speed of tray B is controlled at 0-100 r / min, and the extension and retraction speeds of telescopic rods A and B are controlled at 0-2 m / min.

6. A method for stirring a melt using a multi-flux permanent magnet stirring device as described in claim 1, characterized in that, Includes the following steps: S1: Place the crucible containing the research melt on trays A and B; S2: Start the permanent magnet stirring device and adjust the permanent magnet stirring parameters, including the direction and speed of the permanent magnet, the trolley moving speed, the direction and speed of tray B, and the extension and retraction speed of telescopic rods A and B.

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