KR20080066824A - Ultra-strong permanent-magnetic vortex agitator - Google Patents

Abstract

An ultra-strong permanent-magnetic vortex agitator comprises a frame (3), a main shaft (14), a rotary disc (13), permanent magnets (15) and a non-magnetic safety cover (9). The main shaft (14) is vertical to horizon, and its top end extends through the frame (3) and is provided with a rotary disc (13). The rotary disc (13) is placed horizontally with multiple permanent magnets (15) fixed on the top of it. The permanent magnets (15) are arranged in such a manner that there is at least one closed loop from N-pole to S-pole. The permanent magnets (15) are Nd-Fe-B permanent magnets that are placed in the inner chamber of the non-magnetic safety cover (9) fixed on the frame (3). The non-magnetic safety cover (9) is provided with a round non-metal heat-resistant plate (12) on the top surface of it and is provided with an air-cooling device. The lower end of the main shaft (14) is attached to a decelerating mechanism (1) fixed on the bottom surface of the frame (3), and the power input shaft of the decelerating mechanism (1) is attached to the rotary shaft of a frequency-modulated variable-speed motor (2). The frequency-modulated variable-speed motor (2) is controlled by a programmable logic controller (21) in a controlling-cabinet according to operational program to realize rotation in forward and reverse directions alternately, and to drive the multiple permanent magnets (15) to rotate in forward and reverse directions synchronously through the decelerating mechanism (1), the main shaft (14) and the rotary disc (13). The ultra-strong permanent-magnetic vortex agitator is excellent in energy saving and safety, and is suitable for smelting-furnace with flat bottom which is widely utilized.

Description

Ultra-strong permanent-magnetic vortex agitator

The present invention relates to a non-contact stirrer used for dissolving nonferrous metals, and more particularly, to a super strong permanent magnet vortex stirrer operating at the bottom of the non-ferrous metal melting furnace.

Stirrers are widely used for the dissolution of nonferrous metals. At present, such a widely used method of stirring of agitators includes electromagnetism stirring, mechanical stirring and manual stirring. The electromagnet stirrer is a non-ferrous metal melted by the traveling wave magnetic field generated by energizing a specific coil to flow in the melting furnace. This electromagnet stirrer uses circulating water to dissipate heat, which means that (1) the energy consumption is high, ie a melting furnace that dissolves 30 tons of metal consumes more than 300 kw per hour, (2) to dissipate heat As water circulates through hollow coils, it tends to lead to leakage of power due to low safety (which also has to apply strict requirements for water treatment), and (3) its structure is complex and uses large pipes And disadvantages in that it is difficult to operate.

The working principle of mechanical agitation is contact agitation. This approach is not beneficial due to its narrow stirring range, low agitation speed, and the possibility of burnout and breakage of parts resulting from the limitations of the furnace.

Manual stirring is a more primitive method and has the disadvantages of large scale no power, low stirring speed, uneven stirring and exposure to harsh environments.

In order to solve this problem, Chinese Patent No. 200410071301.X discloses a stirrer and a melting furnace comprising the same. The stirrer includes a plurality of magnets, which includes a plurality of magnets that are rotated by a motor to generate a rotating magnetic field so that the molten nonferrous metal flows in a predetermined direction, thereby causing the molten nonferrous metal to swirl in the melting furnace. do. However, the stirrer is only applicable to furnaces with inclined bottoms. Therefore, the agitator disclosed in Chinese Patent No. 200410071301.X is not applicable to the flat bottom melting furnace which is currently widely used in the nonferrous metal melting industry and its application is limited.

Therefore, it is an object of the present invention to provide a super strong permanent magnet vortex agitator that saves energy, has excellent safety, and can be applied to melting furnaces with flat bottoms.

The super strong permanent magnet vortex stirrer according to the present invention consists of a frame, a spindle, a turntable, a permanent magnet, and a non-magnetic safety enclosure, the upper end of the spindle extending outwards through the frame, the turntable being the spindle And a plurality of permanent magnets are fixedly coupled onto the turntable and arranged to have at least one closed loop from the N-pole to the S-pole. The stirrer is an internal chamber of the non-magnetic safety enclosure in which the spindle is perpendicular to the horizontal plane, the turntable is positioned horizontally, each permanent magnet is an NdFeB permanent magnet, and these NdFeB permanent magnets are fixed to the frame. The non-magnetic safety enclosure is provided with a circular non-metallic heat resistance plate on an upper surface, an air cooling mechanism is provided on the non-magnetic safety enclosure, and a lower end of the spindle is located on the bottom surface of the frame. Directly coupled to the reducer, the power input shaft of the reducer is connected to the rotary shaft of the frequency and speed modulating motor, and the motor is controlled by a programmable controller in the control cabinet according to the operation to alternately perform forward and reverse rotation, and thus Said plurality of permanent magnets being provided with said reducer, said spindle and It is characterized in that it is driven to rotate forward and backward synchronized with the turntable.

The permanent magnet is in the shape of a rectangular or square parallelepiped. They are arranged such that even number of permanent magnets are arranged radially with ends in the same direction as two adjacent permanent magnets of opposite polarity.

The permanent magnets have a square or wedge shape, where the number of square permanent magnets is odd and the number of wedge shaped permanent magnets is two, and these permanent magnets are arranged linearly adjacent to each other on the turntable. Among these permanent magnets, two wedge-shaped magnets are each arranged on two ends, and one square permanent magnet located at the center has the polarities arranged laterally, and the same side of the permanent magnets arranged laterally. The permanent magnets of the phase have the same polarity at the ends in the same direction.

Moreover, the yoke and the auxiliary yoke are continuously fixedly coupled between the permanent magnet and the turntable, which serves to reduce magnetic leakage and increase the strength of the upper magnetic lines of force.

The air cooling mechanism includes an axial fan or centrifugal fan fixedly connected to one side of the non-magnetic safety enclosure, and an exhaust pipe located on an upper surface of the non-magnetic safety enclosure, the exhaust pipe communicating with the high pressure centrifugal fan.

The number of the axial fans (or the centrifugal fans) is 1 or 2 to 4.

In order to sense the temperature in the inner chamber of the non-magnetic safety enclosure, a thermal coupling is installed on the non-magnetic safety enclosure, which helps to control the axial or centrifugal fan to be started or stopped automatically.

The super strong permanent magnet vortex stirrer according to the present invention furthermore consists of a height adjusting means and a traveling mechanism for facilitating its application. The height adjusting means comprise four wormnwheel-screw lifters arranged at each of the four corners of the frame and are driven by a motor.

The driving mechanism includes an angular wheel installed at the bottom of the frame, which consists of a drive wheel and a driven wheel. The drive wheel is connected to a cycloidal pin wheel reducer via a chain, the reducer being installed on the upper surface of the frame and provided with a brake motor.

1 is a schematic structural diagram of a super strong permanent magnet vortex stirrer according to the present invention

2 is a plan view of the stirrer of FIG.

3 is a schematic structural diagram of a transmission system and a permanent magnet assembly according to the present invention;

4 is a top view of a permanent magnet assembly consisting of two permanent magnets

5 is a top view of a permanent magnet assembly consisting of four permanent magnets

6 is a plan view of a permanent magnet assembly consisting of six permanent magnets

7 is a cross sectional view showing a permanent magnet assembly fixedly coupled in a concave yoke, the cross section showing that the assembly consists of three rectangular parallelepipeds and two wedge-shaped permanent magnets.

8 is a plan view of FIG.

9 is a schematic diagram showing a circuit configuration of a programmable controller for controlling a frequency and speed modulating motor in accordance with an operation procedure;

10 is a flow chart showing the forward and reverse rotation of a frequency and speed modulating motor.

Explanation of symbols on the main parts of the drawings

1-reducer

2-frequency and speed modulation motor

3-frame

4-Cycloidal pin wheel reducer with brake motor

5-each wheel

6-worm wheel screw lifter

7-axis fan or centrifugal fan

8-thermal couple

9-non-magnetic safety enclosure

10-exhaust pipe

11-high pressure centrifugal fan

12-nonmetal heat resistance plate

13-turntable

14-spindle

15-permanent magnet

16-York

17-Auxiliary York

18-chain

19-motor

20-case

21-programmable controller

Preferred embodiments of the present invention are described in more detail with reference to the accompanying drawings.

1 and 3, the super strong permanent magnet vortex stirrer according to the present invention is composed of a frame 3 surrounded by a case 20 on the outside. The spindle 14 is provided at right angles to the horizontal plane inside the case 20. An upper end of the spindle 14 extends outward through the frame 3 and the case 20, and is equipped with a turntable 13 positioned horizontally. The lower end of the spindle 14 is connected to a power system provided on the frame 3. Above the turntable 13 a plurality of permanent magnets 15 are fixedly coupled via auxiliary yokes 17 and yokes 16 for reducing magnetic leakage. These permanent magnets 15 are arranged radially at equal intervals. The ends of two permanent magnets 15 adjacent in the same direction are reversed in polarity to form one or more closed loops from the N-pole to the S-pole direction. The permanent magnets 15 may have a rectangular or square parallelepiped shape, the number of which is even, that is, 2, 4, and 6, respectively, as in FIGS. 4, 5, and 6. Each of the permanent magnets 15 is an NdFeB permanent magnet, which is located in the inner chamber of the non-magnetic safety enclosure 9 which is fixedly coupled above the frame 3 and the case 20. The non-magnetic safety enclosure 9 is provided with a thermal bond 8 on its side surface and a circular non-metal thermal resistance plate 12 on its upper surface. Moreover, the non-magnetic safety enclosure 9 is provided with an air cooling mechanism. The lower end of the spindle 14 is directly connected to a power system provided on the bottom surface of the frame 3, the power system comprising a reducer 1 fixed on the bottom surface of the frame 3. do. The power input shaft of the reducer 1 is connected to the rotation shaft of the frequency and speed modulation motor 2. The motor 2 is controlled by a programmable controller 21 in the control cabinet in accordance with the operating procedure, which alternately performs forward and reverse rotation. In this way, the plurality of permanent magnets 15 are rotated forward and backward in synchronization by the reducer 1, the spindle 14 and the turntable 13. 9 and 10, in the programmable controller 21, 0.00, 0.01, 0.02, 0.03, 0.04 represent input ports, 10.0, 10.1, 10.2, 10.3 represent output ports, and SA1- 11 indicates centralized control status button, SAI-21 indicates on-site status button, SB11 is button to start forward rotation, SB12 is button to stop, SB13 is reverse rotation HL1 is a light for forward rotation, HL2 is a light for reverse rotation, HL3 is a light for failure, and K1, K2 and K3 are for controlling the frequency and speed modulation motor. AC contactor for

The permanent magnets 15 may be rectangular (or square) parallelepiped and wedge shaped, as shown in FIGS. 7 and 8, and the number of magnets in the rectangular parallelepiped shape is three (or five). , Seven, or more), and the number of magnets in the wedge shape can be two. These permanent magnets 15 are arranged linearly on the turntable 13 and are closely adjacent to each other. Of these permanent magnets 15, two wedge-shaped magnets are arranged on two ends, and a rectangular parallelepiped-shaped permanent magnet positioned at the center has polarities arranged laterally so that the lines of force of the forces on both sides are deflected to the outside. Be sure to In this way, the width and height of the radiation range of the magnetic lines of force of the force is increased. The permanent magnets on each side of the laterally arranged permanent magnets 15 have the same polarity at their ends in the same direction.

The air cooling mechanism is located on the top surface of the axial fan or centrifugal fan 7, which is fixedly coupled to one side of the non-magnetic safety enclosure 9, and the non-magnetic safety enclosure 9, and the axial flow fan or centrifugal fan. An exhaust pipe 10 in communication with the fan 7. The exhaust pipe 10 is connected to the high-pressure centrifugal fan 11 further provided. The number of the axial fan or the centrifugal fan 7 may be 1, 2, 3 or 4.

The super strong permanent magnet vortex stirrer according to the present invention is provided at the bottom thereof with a height adjusting means adapted to different metal melting furnaces and a traveling mechanism that facilitates its movement at the same time. The height adjusting means comprises four worm wheel-screw lifters 6, the worm wheel-screw lifters 6 being arranged on four corners of the frame 3, respectively, by means of a motor 19. Get power. The driving mechanism comprises an angular wheel 5 installed at the bottom of the frame 3, which consists of a drive wheel and a driven wheel, which is connected to the cycloidal pin wheel reducer 4 via a chain 18. And on the upper surface of the frame 3 by means of the reducer 4 and a brake motor is provided.

In use, the super strong permanent magnet vortex stirrer according to the present invention is arranged closely horizontally to the bottom of the furnace at the bottom of the non-ferrous metal melting furnace, and the turntable is positioned horizontally during operation. The super strong permanent magnet vortex stirrer is suitable for flat bottom furnaces which are widely used. The permanent magnet assembly consists of a high performance NdFeB permanent magnet and is further located within the non-magnetic safety enclosure, so that the system has the advantage of a large range of magnetic fields as well as high strength. On the other hand, yokes and auxiliary yokes formed of magnetically permeable materials are used to further increase the strength of the magnetic lines of force, providing a better effect. Under the action of the frequency and speed modulating motor controlled by a programmable controller in accordance with the course of operation, the super-permanent permanent magnet vortex stirrer according to the invention alternately performs reverse rotation to form a rotating magnetic field. The generated magnetic field causes the molten nonferrous metal to rotate, swirl, and welter in the furnace to obtain a stirring effect. The cooling system utilizes an air cooling mechanism, ie an axial fan or centrifugal fan operates in the non-magnetic safety enclosure, and on the upper surface of the non-magnetic safety enclosure by ventilation of an exhaust pipe connected to the high pressure centrifugal fan. An air-curtain is formed therein to ensure that the working temperature of the permanent magnet system is no higher than a predetermined temperature, for example 42 ^° C. In this way, the advantages of safety and reliability are realized. In a transmission system, the frequency and speed modulation motor drives a reducer directly connected to the spindle, which simplifies the structure and thus lowers the failure rate.

The reducer 1, the frequency and speed modulation motor 2, the cycloidal pinwheel reducer 4 with a brake motor, the worm wheel-screw lifter 6, the axial flow fan 7, the height adjusting means, the The driving mechanism, the high pressure centrifugal fan 11 and the programmable controller 21 are all commercially available and are readily available to those skilled in the art, so detailed descriptions of their structure and principle of operation are omitted.

Advantageous effects of the super strong permanent magnet vortex stirrer according to the present invention, (1) a high-strength magnetic field is generated by the permanent magnet assembly composed of the permanent magnet, the power consumption is only 5% of the power consumption of the electromagnetic stirrer Low, and therefore have significant energy savings, (2) simplified structure, reliable, low failure rate and good safety, and (3) application to widely used flat bottom furnaces. Include.

Claims (11)

A frame, a spindle, a turntable, a permanent magnet and a non-magnetic safety enclosure, the upper end of the spindle extending outwardly through the frame, the turntable being provided at the upper end of the spindle, and the plurality of permanent magnets being A super strong permanent magnet vortex stirrer, fixedly coupled above a turntable, the permanent magnets arranged to have at least one closed loop oriented from the N-pole to the S-pole, The spindle is perpendicular to the horizontal plane, the turntable is positioned horizontally, each permanent magnet is an NdFeB permanent magnet, and these NdFeB permanent magnets are located in an inner chamber of a non-magnetic safety enclosure fixedly coupled to the frame. The non-magnetic safety enclosure is provided with a non-metal thermal resistance plate that is circular on its upper surface, an air cooling mechanism is provided within the non-magnetic safety enclosure, and the lower end of the spindle is located on the bottom surface of the frame. Is directly coupled to the reducer, the power input shaft of the reducer is connected to the rotating shaft of the frequency and speed modulation motor, the motor is controlled by a programmable controller in the control cabinet according to the operation process to perform the forward and reverse rotation alternately, Thus, the plurality of permanent magnets are connected to the reducer, the switch And, super-strong permanent magnet vortex agitator, characterized in that the driving of the plurality of permanent magnets is synchronized through the turntable to the normal and reverse rotation. 2. The permanent magnet according to claim 1, wherein the permanent magnet is in the shape of a rectangular or square parallelepiped, and the even number of permanent magnets are arranged to be arranged radially with the same direction end of two adjacent permanent magnets having opposite polarities. Super strong permanent magnet vortex agitator. 2. The permanent magnets of claim 1, wherein the permanent magnets are square or wedge shaped, the number of square permanent magnets is odd, the number of wedge permanent magnets is 2, and these permanent magnets are linearly adjacent to each other on the turntable. Of these permanent magnets, the two wedge-shaped magnets are arranged on two ends, respectively, and one square permanent magnet located at the center has a laterally arranged polarity and the laterally arranged On the same side of the permanent magnets, said permanent magnets having the same polarity at the ends in the same direction. The super strong permanent magnet vortex stirrer according to any one of the preceding claims, wherein the yoke and the auxiliary yoke are arranged continuously between the permanent magnet and the turntable. 2. The air conditioner of claim 1, wherein the air cooling mechanism comprises an axial fan or centrifugal fan fixedly coupled to the non-magnetic safety enclosure and an exhaust pipe positioned on an upper surface of the non-magnetic safety enclosure. A super strong permanent magnet vortex stirrer, characterized in that connected to. 6. The super strong permanent magnet vortex stirrer according to claim 5, wherein the number of the axial fan or the centrifugal fan is 1 or 2 to 4. The super strong permanent magnet vortex stirrer according to claim 1, wherein a thermal bond is installed on the non-magnetic safety enclosure. The super strong permanent magnet vortex stirrer according to claim 1, 2, 3, 5, 6 or 7, further comprising a height adjusting means and a traveling mechanism. 9. The super strong permanent magnet vortex stirrer according to claim 8, characterized in that the height adjustment means comprise four worm wheel-screw lifters, each arranged on four corners of the frame and driven by a motor. 9. The driving mechanism of claim 8, wherein the driving mechanism is installed at the bottom of the frame and includes an angular wheel consisting of a driving wheel and a driven wheel, the driving wheel is connected to a cycloidal pin wheel reducer through a chain, and the reducer is connected to the frame. And a brake motor provided on the upper surface of the super strong permanent magnet vortex stirrer. 4. The super strong permanent magnet vortex stirrer according to claim 3, wherein the permanent magnets are rectangular or square parallelepipeds.

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