阅读说明：本技术 一种高精度黄铜板带胚料熔炼装置 (High-precision brass plate strip blank smelting device ) 是由 李泽 汪志红 刘跃 周俊 于 2021-07-28 设计创作，主要内容包括：本发明涉及金属熔炼技术领域,且公开了一种高精度黄铜板带胚料熔炼装置,包括炉体,所述炉体内腔的中部设有主坩埚,所述炉体的内腔设有位于主坩埚外周的预热坩埚和冷却液箱,所述预热坩埚和冷却液箱交错分布,所述主坩埚、预热坩埚和冷却液箱的外壁上均设有轮齿,所述冷却液箱、主坩埚、预热坩埚依次通过轮齿传动连接。本发明通过在主坩埚的外周设置多个预热坩埚,并在预热坩埚内装填铜胚料,充分利用感应线圈外部的磁场对胚料进行初步加热,由于主坩埚与预热坩埚相互连通,保证了主坩埚、预热坩埚内腔均处于相同的真空条件下,并可通过真空抽吸在主坩埚内熔炼完成后实现同步输出和输入物料,实现了熔炼的持续性,提高熔炼的效率。(The invention relates to the technical field of metal smelting, and discloses a high-precision brass plate strip blank smelting device which comprises a furnace body, wherein a main crucible is arranged in the middle of an inner cavity of the furnace body, a preheating crucible and a cooling liquid box which are positioned on the periphery of the main crucible are arranged in the inner cavity of the furnace body, the preheating crucible and the cooling liquid box are distributed in a staggered mode, gear teeth are arranged on the outer walls of the main crucible, the preheating crucible and the cooling liquid box, the main crucible and the preheating crucible are sequentially connected through gear teeth in a transmission mode. According to the invention, the plurality of preheating crucibles are arranged on the periphery of the main crucible, copper blanks are filled in the preheating crucibles, and the magnetic field outside the induction coil is fully utilized to carry out primary heating on the blanks.)

1. The utility model provides a device is smelted to high accuracy brass slab band stock, includes furnace body (1), the middle part of furnace body (1) inner chamber is equipped with main crucible (2), its characterized in that: the inner chamber of furnace body (1) is equipped with preheating crucible (3) and coolant liquid case (4) that are located main crucible (2) periphery, preheat crucible (3) and coolant liquid case (4) crisscross distribution, all be equipped with teeth of a cogwheel (5) on main crucible (2), the outer wall of preheating crucible (3) and coolant liquid case (4), main crucible (2), preheating crucible (3) loop through teeth of a cogwheel (5) transmission and are connected, pan feeding mouth and discharge gate have all been seted up at the upper and lower both ends of main crucible (2), preheating crucible (3) and coolant liquid case (4), the discharge gate of preheating crucible (3) and the adjacent pan feeding mouth that preheats crucible (3) communicate in proper order, the top of main crucible (2), preheating crucible (3) all is equipped with sealed upper cover (10), the discharge gate and main crucible (2) of coolant liquid case (4), The inner cavities of the preheating crucibles (3) are communicated.

2. The high-precision brass plate strip blank smelting device according to claim 1, wherein: the inside of main crucible (2) is equipped with induction coil (201), cooling chamber (11) have all been seted up to the inside of main crucible (2) and preheating crucible (3), the top of main crucible (2) is equipped with vacuum passageway (205), vacuum passageway (205) are connected with the vacuum pump, be connected with plywood (203) on the inner wall of main crucible (2), form between the bottom surface of plywood (203) and main crucible (2) slow flow chamber (202), be equipped with temperature-solenoid valve (204) on plywood (203), the discharge gate intercommunication of main crucible (2) has pouring device (12).

3. The high-precision brass plate strip blank smelting device according to claim 1, wherein: the cooling liquid box (4) comprises an inner barrel (401) and an outer barrel (402), the outer barrel (402) is movably sleeved on the periphery of the inner barrel (401), the inner barrel (401) and the outer barrel (402) are both cylindrical, the inner barrel (401) and the outer barrel (402) are coaxially assembled, the height of the outer barrel (402) is half of the height of the inner barrel (401), a heat insulation layer (9) is arranged on the inner wall of the outer barrel (402), a driving assembly (6) is arranged on the inner barrel (401) and the outer barrel (402), and a sliding plug (8) is slidably connected inside the inner barrel (401).

4. The high-precision brass plate strip blank smelting device according to claim 3, wherein: drive assembly (6) are including atress conductor (601) and trigger conductor (602), in the teeth of a cogwheel (5) on urceolus (402) outer wall were located to atress conductor (601), atress conductor (601) distributes on the horizontal central line of induction coil (201), the quantity of trigger conductor (602) is two and the symmetry sets up on the outer wall of inner tube (401), two the electric current that lets in opposite direction in trigger conductor (602).

5. The high-precision brass plate strip blank smelting device according to claim 4, wherein: the opposite face of atress conductor (601) and trigger conductor (602) all is the arc, trigger conductor (602) slope sets up just trigger conductor (602) are close to the one end at coolant liquid case (4) center and are slightly less than the bottom of atress conductor (601), and is adjacent distance between atress conductor (601) is two times of trigger conductor (602) arcwall face length, the one side that atress conductor (601) were kept away from in trigger conductor (602) is connected with the spring.

6. The high-precision brass plate strip blank smelting device according to claim 3, wherein: the bottom end of the outer cylinder (402) is connected with a steering mechanism (7), a reciprocating connecting rod (701) extends out of the steering mechanism (7), the reciprocating connecting rod (701) penetrates through the bottom surface of the inner cylinder (401) and extends into the inner cylinder (401), the reciprocating connecting rod (701) is connected with a sliding plug (8), a liquid flow hole (801) is formed in the sliding plug (8), and a warm-electric valve (802) is arranged at the liquid flow hole (801).

Technical Field

The invention relates to the technical field of metal smelting, in particular to a high-precision brass plate strip blank smelting device.

Background

The crucible is sealed in a vacuum chamber, and the eddy current heat generated by electromagnetic induction is used as a heat source to smelt and cast metal and alloy in a vacuum state, so that the high-quality material is obtained.

The vacuum induction furnace for smelting the metal copper generally selects medium-frequency current, but a magnetic field generated by the current is only used for heating metal materials positioned in an inner ring of an induction coil, and the energy utilization rate of the magnetic field positioned in an outer ring of the induction coil is lower, so that the conventional vacuum induction furnace has low energy-saving effect and high cost; need continuously cool down the crucible in the use of vacuum induction furnace in addition, but because the temperature of the crucible body is too high, consequently need heat in order to reduce the temperature difference between crucible and the coolant liquid for the coolant liquid, prevent that the difference in temperature is too big to lead to producing a large amount of steam and polluting the molten metal, but current coolant liquid needs additionally to use the energy to heat, has further increaseed the cost of smelting.

Disclosure of Invention

Aiming at the defects of the existing smelting device in the use process in the background technology, the invention provides a high-precision brass plate strip blank smelting device which has the advantages of high energy utilization rate, low smelting cost and energy conservation, and solves the problems in the background technology.

The invention provides the following technical scheme: the utility model provides a device is smelted to high accuracy brass slab band stock, includes the furnace body, the middle part of furnace body inner chamber is equipped with main crucible, the inner chamber of furnace body is equipped with preheating crucible and the coolant liquid case that is located main crucible periphery, preheat crucible and the crisscross distribution of coolant liquid case, all be equipped with the teeth of a cogwheel on the outer wall of main crucible, preheating crucible and coolant liquid case, main crucible, preheating crucible loop through the transmission of the teeth of a cogwheel and connect, pan feeding mouth and discharge gate have all been seted up at the upper and lower both ends of main crucible, preheating crucible, the discharge gate of preheating crucible and the adjacent pan feeding mouth that preheats the crucible communicate in proper order, the top of main crucible, preheating crucible all is equipped with sealed upper cover, the discharge gate and the main crucible of coolant liquid case, the inner chamber of preheating crucible are linked together.

Preferably, the inside of main crucible is equipped with induction coil, the cooling chamber has all been seted up with the inside of preheating the crucible to main crucible, the top of main crucible is equipped with vacuum channel, vacuum channel is connected with the vacuum pump, be connected with the plywood on the inner wall of main crucible, form the slow flow chamber between the bottom surface of plywood and main crucible, be equipped with the temperature-solenoid valve on the plywood, the discharge gate intercommunication of main crucible has the pouring device.

Preferably, the coolant tank includes inner tube and urceolus, the urceolus activity cup joints in the periphery of inner tube, inner tube and urceolus are cylindricly, inner tube and urceolus coaxial assembly just the height of urceolus is the half of inner tube height, the inner wall of urceolus is equipped with the heat preservation, be equipped with drive assembly on inner tube and the urceolus, the inside sliding connection of inner tube has the sliding plug.

Preferably, the driving assembly comprises a stressed conductor and two triggering conductors, the stressed conductor is arranged in the gear teeth on the outer wall of the outer cylinder, the stressed conductor is distributed on the horizontal central line of the induction coil, the two triggering conductors are symmetrically arranged on the outer wall of the inner cylinder, and currents in opposite directions are introduced into the two triggering conductors.

Preferably, the opposite surfaces of the stressed conductor and the trigger conductor are both arc-shaped, the trigger conductor is obliquely arranged, one end, close to the center of the cooling liquid tank, of the trigger conductor is slightly lower than the bottom end of the stressed conductor, the distance between the adjacent stressed conductors is twice the length of the arc-shaped surface of the trigger conductor, and one surface, far away from the stressed conductor, of the trigger conductor is connected with a spring.

Preferably, the bottom end of the outer cylinder is connected with a steering mechanism, a reciprocating connecting rod extends out of the steering mechanism, the reciprocating connecting rod penetrates through the bottom surface of the inner cylinder and extends into the inner cylinder, the reciprocating connecting rod is connected with a sliding plug, a liquid flow hole is formed in the sliding plug, and a temperature-electric valve is arranged at the liquid flow hole.

The invention has the following beneficial effects:

1. according to the invention, the plurality of preheating crucibles are arranged on the periphery of the main crucible, copper blanks are filled in the preheating crucibles, and the magnetic field outside the induction coil is fully utilized to carry out primary heating on the blanks.

2. According to the invention, the cooling liquid box is arranged in the furnace body, the cooling liquid box is utilized to absorb heat conducted by materials in the main crucible and the preheating crucible through the furnace body, the temperature of the furnace body is reduced while the cooling liquid in the cooling liquid box is preliminarily preheated, and after the cooling liquid in the cooling liquid box is heated to the standard temperature, the cooling liquid is conveyed into the cooling cavities of the main crucible and the preheating crucible, so that the effect of further cooling the main crucible and the preheating crucible is achieved, the process of additionally heating the cooling liquid is avoided, and the utilization rate of preheating is fully improved.

3. According to the invention, the stressed conductor and the trigger conductor are respectively arranged on the inner cylinder and the outer cylinder, the outer cylinder is driven to rotate by the ampere force applied when the stressed conductor in the magnetic field of the induction coil is contacted with the trigger conductor, the main crucible and the preheating crucible are driven to rotate by the meshing of the gear teeth, the radial flow of materials in the main crucible and the preheating crucible is promoted by the centrifugal force, and the uniformity of material mixing and the smelting efficiency are improved.

4. The invention converts the rotation of the outer cylinder into the reciprocating movement of the sliding plug through the steering mechanism and the reciprocating connecting rod, conveys the cooling liquid into the cooling cavity through the downward moving pressure of the sliding plug, and simultaneously pumps the cooling liquid into the inner cylinder to ensure the sufficiency of the cooling liquid.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a partial top cross-sectional view of the present invention;

FIG. 3 is a schematic top view of the coolant tank of the present invention;

fig. 4 is a top view of the present invention.

In the figure: 1. a furnace body; 2. a main crucible; 201. an induction coil; 202. a slow flow cavity; 203. laminating the board; 204. a temperature-solenoid valve; 205. a vacuum channel; 3. preheating a crucible; 4. a coolant tank; 401. an inner barrel; 402. an outer cylinder; 5. gear teeth; 6. a drive assembly; 601. a stressed conductor; 602. a trigger conductor; 7. a steering mechanism; 701. a reciprocating connecting rod; 8. a sliding plug; 801. a liquid flow aperture; 802. a thermo-electric valve; 9. a heat-insulating layer; 10. sealing the upper cover; 11. a cooling chamber; 12. and (5) pouring the mixture.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, a high-precision brass plate strip blank smelting device comprises a furnace body 1, a main crucible 2 is arranged in the middle of an inner cavity of the furnace body 1, a preheating crucible 3 and a cooling liquid tank 4 which are arranged on the periphery of the main crucible 2 are arranged in the inner cavity of the furnace body 1, the preheating crucible 3 and the cooling liquid tank 4 are distributed in a staggered manner, gear teeth 5 are arranged on the outer walls of the main crucible 2, the preheating crucible 3 and the cooling liquid tank 4, the cooling liquid tank 4 is in transmission connection with the main crucible 2 through the gear teeth 5, the main crucible 2 is in transmission connection with the preheating crucible 3 through the gear teeth 5, the number of the main crucible 2 is one, the number of the preheating crucible 3 and the cooling liquid tank 4 is set according to requirements or the volume size of the furnace body 1, the upper end and the lower end of the main crucible 2, the preheating crucible 3 and the cooling liquid tank 4 are respectively provided with a feeding port and a discharging port, the discharging port of the preheating crucible 3 is sequentially communicated with the feeding port of the adjacent preheating crucible 3, the feeding port of the first preheating crucible 3 is connected with a feeding device, the feeding device is the prior art and is not shown in the application, and the discharging port of the last preheating crucible 3 is communicated with the feeding port of the main crucible 2;

the induction coil 201 is arranged in the main crucible 2, when the induction coil 201 is electrified, magnetic field lines are also distributed on the periphery of the induction coil 201 by the magnetic field generated by the induction coil 201, so that the preheating crucible 3 is arranged on the periphery of the main crucible 2, copper material is added into the preheating crucible 3, the magnetic field on the periphery of the induction coil 201 can preheat the copper material in the preheating crucible 3, and the utilization rate of energy is improved; cooling cavities 11 are formed in the main crucible 2 and the preheating crucible 3, cooling water is introduced into the cooling cavities 11 and used for cooling the main crucible 2 and the preheating crucible 3, and the damage of the main crucible 2 and the preheating crucible 3 due to overhigh temperature is avoided, but because high-temperature copper solution is filled in the melting cavities of the main crucible 2 and the preheating crucible 3, the temperature difference between the cooling water used for cooling the main crucible 2 and the preheating crucible 3 and the temperature difference between the cooling water and the main crucible 2 and the temperature difference between the cooling water and the temperature difference of the preheating crucible 3 are not overlarge, otherwise, a large amount of water vapor is easily generated in the main crucible 2 and the preheating crucible 3, the water vapor is dissipated into the melting cavity to influence the quality of the copper solution, and in addition, the quenching of the inner wall of the melting cavity of the main crucible 2 can also cause the temperature reduction of the copper solution close to the inner wall; in the application, the height of the induction coil 201 is slightly less than that of the melting cavity of the main crucible 2, the density of the magnetic field of the induction coil 201 at the upper inlet and the lower outlet ends of the solenoid is the same as that of the magnetic field at the middle part of the induction coil 201, and generally, after the induction coil 201 is arranged at the same height as that of the melting cavity of the main crucible 2, the energy of the magnetic induction lines dense at the two ends of the melting cavity of the main crucible 2 cannot be fully utilized, so that the energy utilization efficiency is reduced; the inner wall of the main crucible 2 is connected with a laminate 203, a slow flow cavity 202 is formed between the laminate 203 and the surface of the main crucible 2, a temperature-electromagnetic valve 204 is mounted on the laminate 203, a discharge port of the main crucible 2 is connected with a pouring device 12, molten copper in the melting cavity of the main crucible 2 enters the pouring device 12 through the discharge port for pouring and molding, the temperature-electromagnetic valve 204 comprises a temperature sensor and an electromagnetic valve, the temperature sensor is arranged above the laminate 203, the electromagnetic valve is arranged in a through hole formed in the laminate 203, in the discharging stage, when the temperature sensor detects that the temperature of the copper at the upper end of the laminate 203 is reduced, the electromagnetic valve is controlled to be closed immediately, so that the copper with low temperature is prevented from entering the pouring device 12, and the time for the copper solution in the slow flow cavity 202 to flow into the pouring device 12 provides sufficient time for the actions of the temperature sensor and the electromagnetic valve; the top parts of the main crucible 2 and the preheating crucible 3 are respectively provided with a sealing upper cover 10, the top part of the main crucible 2 is provided with a vacuum channel 205, the vacuum channel 205 is connected with a vacuum pump, the vacuum pump connected with the vacuum channel 205 can keep the consistent vacuum degree of the main crucible 2 and the preheating crucible 3, and the copper liquid in the preheating crucible 3 and the main crucible 2 can continuously flow in a circulating manner in a vacuumizing manner, so that the continuous smelting function is realized; when the copper liquid in the preheating crucible 3 enters the main crucible 2, the copper liquid newly entering the main crucible 2 can be blocked from entering the pouring device 12 through the combined action of the laminate 203 and the temperature-electromagnetic valve 204 because of the temperature difference of the solution;

the cooling liquid box 4 is positioned in the furnace body 1, absorbs the heat of the main crucible 2 and the preheating crucible 3 through heat conduction, conducts the heat to the cooling liquid in the cooling liquid box 4, and primarily heats the cooling liquid, so that the problem of generation of a large amount of steam caused by overlarge temperature difference between the cooling liquid and the main crucible 2 and between the cooling liquid and the preheating crucible 3 is avoided, and meanwhile, the cooling liquid box 4 can achieve the effect of primarily cooling the main crucible 2 and the preheating crucible 3 in the process of absorbing the heat for preheating, but the problem of sudden temperature drop of the main crucible 2 and the preheating crucible 3 can also be avoided because the cooling liquid box 4 is not directly contacted with the main crucible 2 and the preheating crucible 3;

the cooling liquid tank 4 comprises an inner cylinder 401 and an outer cylinder 402, the outer cylinder 402 is movably sleeved on the periphery of the inner cylinder 401, the inner cylinder 401 is fixed relative to the furnace body 1, the outer cylinder 402 can rotate relative to the inner cylinder 401, when the outer cylinder 402 rotates, the outer cylinder 402 drives the main crucible 2 to rotate, the main crucible 2 drives the preheating crucible 3 to rotate through the meshing action of the gear teeth 5, in the prior art, the solution in the main crucible 2 and the preheating crucible 3 has the effect of magnetic stirring under the action of a magnetic field, but the direction of the magnetic stirring is from the center to the periphery, namely, the solution has better stirring effect in the longitudinal direction, but has poorer stirring effect in the radial direction, the outer cylinder 402 drives the main crucible 2 and the preheating crucible 3 to rotate, the radial flow of the solution is increased by utilizing the centrifugal force, thereby improving the radial stirring effect of the solution and improving the efficiency of the solution smelting in the main crucible 2 and the preheating crucible 3; the inner cylinder 401 and the outer cylinder 402 are both cylindrical, the inner cylinder 401 and the outer cylinder 402 are coaxially assembled, the height of the outer cylinder 402 is half of that of the inner cylinder 401, namely, the upper half part of the inner cylinder 401 is exposed out of the outer cylinder 402, the inner wall of the outer cylinder 402 is provided with a heat insulation layer 9, the heat insulation layer 9 is used for keeping the temperature of the cooling liquid of the inner cylinder 401 in the outer cylinder 402, the temperature of the cooling liquid in the outer cylinder 402 reaches the standard of conveying the cooling liquid into the cooling cavity 11 of the main crucible 2, and the cooling liquid outside the outer cylinder 402 does not have the heat insulation function of the heat insulation layer 9, so that the heat can be absorbed by the heat conduction function of the furnace body 1 continuously to heat the cooling liquid; the inner cylinder 401 and the outer cylinder 402 are provided with a driving assembly 6, the driving assembly 6 can make the outer cylinder 402 rotate by utilizing the magnetic field generated by the induction coil 201, and the specific structure of the driving assembly 6 is as follows:

the driving component 6 comprises a stressed conductor 601 and a trigger conductor 602, the stressed conductor 601 is arranged in the gear teeth 5 on the outer wall of the outer cylinder 402, the stressed conductor 601 is distributed on the horizontal central line of the induction coil 201, the number of the trigger conductors 602 is two, and the two trigger conductors are symmetrically arranged on the outer wall of the inner cylinder 401, currents in opposite directions are introduced into the two trigger conductors 602, namely, the stressed conductor 601 and the trigger conductor 602 are positioned on the vertical height of the peripheral magnetic field direction of the induction coil 201, the vertical height of the magnetic field generated by the induction coil 201 is the height of the horizontal central line of the induction coil 201, the trigger conductor 602 and the stressed conductor 601 are perpendicular to the magnetic field at the position, therefore, when the stressed conductor 601 rotates to be in contact with the trigger conductor 602, the currents are introduced into the stressed conductor 601, the stressed conductor 601 moves along the tangential direction of the main crucible 2 and the outer cylinder 402 under the action of the lorentz force, and the outer cylinder 402 rotates under the action of the tangential force, when the stressed conductor 601 is disconnected from the trigger conductor 602, the outer cylinder 402 is continuously driven to rotate due to inertia, then the next stressed conductor 601 is contacted with the trigger conductor 602, and the actions are repeated, so that the outer cylinder 402 is continuously rotated; the distance between the adjacent stressed conductors 601 is twice the length of the arc-shaped surface of the trigger conductor 602, so that a time interval that the trigger conductor 602 is not in contact with the trigger conductor 602 exists in the process of separating the trigger conductor 602 from the current stressed conductor 601 to be in contact with the next stressed conductor 601, and in the time interval, the inertial rotation speed of the outer cylinder 402 is slightly reduced, so that the outer cylinder 402 realizes intermittent acceleration and deceleration processes, so that the main crucible 2 and the preheating crucible 3 which are meshed with the outer cylinder 402 also have the rotation effect, which can promote the centrifugal force applied to the molten liquid in the main crucible 2 and the preheating crucible 3 to be intermittently increased and reduced, when the centrifugal force is large, the solution is dispersed to the periphery, and when the centrifugal force is reduced, the solution flows to the center, thereby further promoting the radial mixing effect of the solution; the opposite surfaces of the stressed conductor 601 and the trigger conductor 602 are both arc-shaped, the trigger conductor 602 is obliquely arranged, one end, close to the center of the cooling liquid tank 4, of the trigger conductor 602 is slightly lower than the bottom end of the stressed conductor 601, one surface, far away from the stressed conductor 601, of the trigger conductor 602 is connected with a spring, in the rotating process of the outer cylinder 402, one end, in contact with the stressed conductor 601, of the trigger conductor 602 is slightly lower than the stressed conductor 601, so that the contact between the stressed conductor 601 and the trigger conductor 602 can be ensured, the movement of the stressed conductor 601 is not blocked by the trigger conductor 602, in addition, the trigger conductor 602 has mobility under the action of the spring, the contact effect between the stressed conductor 601 and the trigger conductor 602 can be improved, and meanwhile, the contact friction between the stressed conductor 601 and the trigger conductor 602 is reduced;

a liquid inlet is formed in the top end of the inner cylinder 401, a liquid outlet is formed in the bottom end of the inner cylinder 401, and the liquid outlet of the inner cylinder 401 is communicated with the cooling cavity 11 of the main crucible 2 and the preheating crucible 3 through pipelines; the inner cylinder 401 is connected with a sliding plug 8 in a sliding manner, the sliding plug 8 is provided with a liquid flow hole 801, the liquid flow hole 801 is provided with a temperature-electric valve 802, the temperature-electric valve 802 and the temperature-electromagnetic valve 204 have substantially the same structure, namely when the temperature of the solution above the sliding plug 8 reaches a set standard, the cooling liquid above the sliding plug 8 can flow to the lower part of the sliding plug 8 through the liquid flow hole 801, the bottom end of the outer cylinder 402 is connected with a steering mechanism 7, a reciprocating connecting rod 701 extends out of the steering mechanism 7, the steering mechanism 7 is used for converting the rotation of the outer cylinder 402 into the reciprocating movement of the reciprocating connecting rod 701, the reciprocating connecting rod 701 penetrates through the inner cylinder 401 and is connected with the sliding plug 8 in the inner cylinder 401, the reciprocating movement of the sliding plug 8 is driven by the reciprocating movement of the reciprocating connecting rod 701, when the sliding plug 8 moves downwards, the cooling liquid below the sliding plug 8 is pressed into the cooling cavity 11 of the main crucible 2 and the preheating crucible 3 for cooling, and the cooling liquid outside the furnace body 1 is pumped into the space above the sliding plug 8 for supplementing the cooling liquid in the inner cylinder 401, the inlet and outlet of the inner cylinder 401 are provided with one-way valves for preventing the cooling liquid from flowing backwards, and in addition, in order to avoid the sliding plug 8 from being blocked in the upward moving process, the inner cavities of the inner cylinders 401 at the two ends of the sliding plug 8 are respectively reserved with a certain space, and the smoothness of the up-and-down movement of the sliding plug 8 is ensured by utilizing the compressibility of the air in the space.

Because the current in the induction coil 201 is medium-high frequency current, the current introduced into the stressed conductor 601 and the trigger conductor 602 is much smaller than the current in the induction coil 201, so that the rotation requirements of the main crucible 2, the preheating crucible 3 and the outer cylinder 402 can be met, and the energy is greatly saved.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.