CN212158118U - A new type of melting furnace - Google Patents

Abstract

The utility model belongs to the technical field of the melting furnace, specifically be a novel melting furnace, include: the melting device comprises a rotary base and at least one melting holding furnace fixed on the rotary base, and the melting holding furnace is used for melting the alloy ingot into alloy liquid; the feeding device is used for grabbing the alloy ingot and putting the alloy ingot into a melting heat preservation furnace; and the pouring device is used for sucking the alloy liquid in the melting and heat-preserving furnace and pouring. The utility model discloses to feed in raw material, melt heat preservation, quantitative pouring and carry out integration miniaturized design, reduced the intermediate link, shortened production time, oven surface area and high temperature alloy liquid expose the area and reduce greatly, furthest's reduction heat energy loss.

Description

A new type of melting furnace

technical field

The utility model belongs to the technical field of melting furnaces, in particular to a novel melting furnace.

Background technique

In the production process of the existing melting furnace, the alloy first generates heat through electricity or fossil fuel in the centralized melting furnace, so that the alloy is melted into a liquid, and then the melted alloy liquid is injected into the intermediate transfer ladle, and the heat preservation is added by a crane or a forklift. Heat preservation in the furnace, and then the alloy liquid in the heat preservation furnace is scooped into the gate of the die casting machine or mold by manual or pouring manipulators for die casting or gravity casting production. The heat is dissipated into the air from the furnace wall, resulting in a great loss of heat energy. During the transportation of the alloy liquid, the high temperature liquid of about 700°C is exposed to the air for many times for a long time, resulting in more heat energy loss. During the production process It also causes a great loss of heat energy, and at high temperature, the alloy liquid will chemically react with oxygen in the air to produce oxide slag, which not only produces 5-8% loss of raw materials, but also reduces the quality of the alloy liquid.

The existing melting furnace equipment needs to be stirred many times to expose the alloy liquid to the air, and a large amount of gas and oxide slag are involved in the alloy liquid. A lot of smoke and heat that pollute the environment. In addition, the original equipment requires a lot of manual labor in the production process from material input, smelting process, and transfer process to production operations and production preparations, and the working temperature is high, the environment is poor, and the labor intensity is also high.

Utility model content

In order to solve the above-mentioned problems in the background technology, the present utility model provides a novel melting furnace, which integrates charging, melting and heat preservation, quantitative pouring, and miniaturized design, reduces the intermediate ring, shortens the production time, and reduces the exposed area of the superalloy liquid. It is greatly reduced, the heat loss is greatly reduced, and the automatic continuous and uninterrupted operation is realized, which saves labor and improves production efficiency and benefits.

The utility model adopts the following technical solutions, a novel melting furnace includes: a melting device, the melting device includes a rotary base and at least one melting and holding furnace fixed on the rotating base, and the melting and holding furnace is used for melting alloy ingots into alloys The feeding device is used to grab the alloy ingot and put the alloy ingot into the melting and holding furnace; the pouring device is used to absorb the alloy liquid in the melting and holding furnace and pour it.

Further, the melting and holding furnace is evenly arranged on the rotary base in the circumferential direction. The melting and holding furnace includes a furnace cover and a furnace shell. The furnace shell is provided with a furnace hearth, a crucible inner liner is arranged in the furnace hearth, and an electric heater is arranged between the furnace hearth and the crucible inner liner. Wire and furnace thermocouples, and alloy liquid thermocouples are arranged in the crucible liner.

Further, the furnace cover is provided with an entry and exit channel, and the entry and exit channel is provided with a small furnace cover that can be automatically opened and closed.

Further, the feeding device includes a first lifting and translational assembly and a mechanical claw connected to the first lifting and translational assembly, and the mechanical claw is used to grab the alloy ingot and move and place it in the melting and holding furnace.

Further, the pouring device includes a second lifting and translation assembly and a quantitative liquid taking assembly fixedly connected with the second lifting and translation assembly, the quantitative liquid taking assembly includes a cavity, and there is a piston in the cavity, and the piston is fixedly connected to make the piston move up and down. The bottom end of the cavity is provided with a liquid taking pipe, the lower end of the liquid taking pipe is provided with a liquid taking port, and the liquid taking pipe is communicated with the cavity.

Further, the lead screw assembly includes a first motor, a first bevel gear, a second bevel gear, a rotating nut and a first lead screw, the first motor is connected to the first bevel gear through a motor shaft, and the first bevel gear is connected to the second bevel gear. Gear transmission meshes, the rotating nut is fixed on the second bevel gear and rotates coaxially with the second bevel gear, one end of the first lead screw passes through the second bevel gear and is rotatably connected to the rotating nut, and the other end of the first lead screw Fixed connection to the piston.

Further, the liquid taking pipe is fixedly connected with the lower end of the cavity through the heat insulating flange.

Further, the new melting furnace also includes a guide tube, which is sequentially composed of corundum ceramic lining, electric heating wire, fiber insulation sticky cotton and stainless steel shell from the inside to the outside, and the diameter of the guide tube is suitable for the outer diameter of the liquid taking tube. match.

Further, an atomization generating device is also included, a nitrogen gas pipeline is connected to the atomization generating device, a plurality of nitrogen gas nozzles are formed at the end of the nitrogen gas pipeline, and the nitrogen gas nozzles are located at the inlet channel of the furnace cover of the melting and holding furnace.

Further, the nitrogen gas nozzle is also located at the contact of the guide tube and the liquid taking tube.

Compared with the prior art, the beneficial effects of the present utility model are:

(1) The novel melting furnace of the present utility model carries out the integrated miniaturization design of feeding, melting and heat preservation, and quantitative pouring, which reduces the intermediate links and shortens the production time. The surface area of the furnace wall and the exposed area of the superalloy liquid are greatly reduced, and the maximum reduces heat loss.

(2) The melting and holding furnace of the novel melting furnace of the present utility model adopts a dual temperature and dual control mode, and a furnace chamber thermocouple is arranged in the furnace chamber. When the temperature in the furnace chamber rises to a certain temperature, the power supply is disconnected; For the alloy liquid thermocouple, when the alloy liquid rises to the set temperature, the power supply is also disconnected, so as to ensure that the temperature in the melting and holding furnace is always at the set temperature.

(3) When the quantitative device of the novel melting furnace of the present utility model is in use, the piston is at the lowest end of the cavity, the liquid taking pipe is in the alloy liquid of the melting and holding furnace, and the first motor is started to move the piston upward, so that a negative pressure is formed in the cavity. According to the demand for alloy liquid of the casting parts, the alloy liquid in the melting and heat preservation chamber is sucked into the liquid extraction pipe to complete the quantitative liquid extraction.

(4) The novel melting furnace of the present utility model is filled with nitrogen in the place where the alloy liquid is in contact with the air, so that the alloy liquid is cut off from the air, which can prevent the alloy from oxidizing to improve the alloy quality and reduce the generation of oxide slag, which reduces the traditional process. In the refining process, the environmental protection effect is significantly improved.

(5) The novel melting furnace of the present utility model adds a small openable and closable furnace cover above the furnace cover, so that the quantitative device only opens the small furnace cover when absorbing the alloy liquid, thereby reducing the exposed area of the alloy liquid in the air , so that the heat loss of the alloy liquid is reduced, and the oxidation of the alloy liquid is reduced.

(6) The novel melting furnace of the present utility model is miniaturized and integrated design. Compared with traditional production equipment, the storage capacity of superalloy liquid in the equipment is greatly reduced, on the one hand, energy is saved, and on the other hand, the production process is improved. safety performance in .

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings used in the description of the embodiments or the prior art. It is obvious that the accompanying drawings in the following description These are just some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

Fig. 1 is the overall structure schematic diagram of the novel melting furnace of the present utility model;

Fig. 2 is the schematic diagram of the novel melting furnace pouring device of the present invention;

Fig. 3 is the schematic diagram of the lead screw assembly of the novel melting furnace of the present invention;

Fig. 4 is the melting and holding furnace structure schematic diagram of the novel melting furnace of the utility model;

Fig. 5 is the rotary base structure schematic diagram of the novel melting furnace of the present invention;

Fig. 6 is the structural schematic diagram of the guide pipe of the novel melting furnace of the present invention;

7 is a schematic diagram of the pouring process of the novel melting furnace of the present invention;

Among them, 1-melting device, 11-rotating base, 12-melting and holding furnace, 121-furnace cover, 122-furnace shell, 123-furnace chamber, 124-crucible liner, 125-electric heating wire, 126-furnace thermocouple, 127-Alloy liquid thermocouple, 128-In and out channel, 129-Small furnace cover, 2-Feeding device, 21-First lifting and translation component, 210-First column, 211-Second screw, 212-Second motor, 213-Second Nut, 22-Mechanical Claw, 23-Material Box, 3-Pouring Device, 31-Second Lifting and Translation Assembly, 32-Quantitative Liquid Suction Assembly, 320-Cavity, 321-Piston, 322-Upper Chamber , 323-lower chamber, 324-first motor, 325-first bevel gear, 326-second bevel gear, 327-rotating nut, 328-first screw, 33-liquid pipe, 4-guide pipe , 41- corundum ceramic lining, 42- heating wire, 43- fiber insulation sticky cotton, 44- stainless steel shell, 5- atomization generating device, 51- nitrogen nozzle.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

As shown in Figures 1-7, the present utility model provides a novel melting furnace, comprising: a melting device 1, the melting device 1 includes a rotary base 11 and at least one melting and holding furnace 12 fixed on the rotary base 11, the melting and heat preservation furnace 12 is The furnace 12 is used for melting the alloy ingot into an alloy liquid; the feeding device 2 is used to grab the alloy ingot and put the alloy ingot into the melting and holding furnace 12; the pouring device 3 is used for absorbing the alloy liquid in the melting and holding furnace 12 , and poured.

The utility model integrates the miniaturization design of feeding, melting and heat preservation, and quantitative pouring, reduces the intermediate links, shortens the production time, greatly reduces the surface area of the furnace wall and the exposed area of the high-temperature alloy liquid, and minimizes the loss of heat energy.

Specifically, as shown in FIG. 4 , the melting and holding furnaces 12 are evenly arranged on the rotary base 11 in the circumferential direction, and a plurality of melting and holding furnaces 12 are provided, which can meet the requirements of different pouring amounts of alloy liquids. When a group of melting and holding furnaces 12 are in During the pouring operation, the other groups of melting and holding furnaces 12 are in the melting or holding state to ensure that there is enough alloy liquid for pouring at any time. Multiple groups of melting and holding furnaces 12 are evenly installed on a rotating base 11. The rotating base 11 can be The rotation is performed in a pre-set manner to move the melting and holding furnace 12 to the pouring or charging position.

Specifically, the melting and holding furnace 12 of this embodiment includes a furnace cover 121 and a furnace shell 122. The furnace shell 122 has a furnace chamber 123, and the furnace chamber 123 is provided with a crucible liner 124. An electric heater is provided between the furnace chamber 123 and the crucible liner 124. The wire 125 and the furnace thermocouple 126 are provided with an alloy liquid thermocouple 127 in the crucible liner 124, and the furnace cover 121 is provided with an inlet and outlet channel 128, and the inlet and outlet channel 128 is provided with a small furnace cover 129 that can be automatically opened and closed. The melting and holding furnace 12 of the present embodiment adopts a dual-temperature and dual-control mode, and a furnace thermocouple 126 is provided in the furnace chamber 123. When the temperature in the furnace chamber rises to a certain temperature, the power supply is disconnected; in the crucible liner 124, an alloy liquid thermoelectric Even 127, when the alloy liquid rises to the set temperature, the power supply is also cut off, so as to ensure that the temperature in the melting and holding furnace 12 is always at the set temperature; at the same time, a small openable and closable furnace cover 129 is added above the furnace cover 121. , so that the pouring device 3 only opens the small furnace cover 129 when sucking the alloy liquid, thereby reducing the exposed area of the alloy liquid in the air, reducing the heat loss of the alloy liquid and reducing the oxidation of the alloy liquid.

Further, the feeding device 2 includes a first lifting and translation assembly 21 and a mechanical claw 22 connected to the first lifting and translation assembly 21 . The mechanical claw 22 is used to grab the alloy ingot and move it into the melting and holding furnace 12 . The feeding device 2 of this embodiment also includes a material preparation box 23, and the alloy ingots are put into the material preparation box 23 for standby use. The material preparation box 23 is set to be movable in the horizontal direction, so that the alloy ingots to be added to the melting and holding furnace 12 are just in the mechanical claw. Below 22, under the action of the first lifting and translation assembly 21, the mechanical claw 22 moves downward, clamps the alloy ingot in the stocking box 23, and lifts it vertically to a certain height, so that the lower end of the alloy ingot is separated from the stocking box. 23. After the mechanical claw 22 and the alloy ingot are moved horizontally above the melting and holding furnace 12, they move downward, and the alloy ingot is put into the melting and holding furnace 12. The mechanical claw 22 is lifted upward, and the furnace cover 121 is closed to complete the charging process. The first lifting and translation assembly 21 in this embodiment includes a first column 210 , a second lead screw 211 vertically fixed on the first column 210 , and a second motor 212 connected to the second lead screw 211 . The second motor 212 The second lead screw 211 is driven to rotate, a second nut 213 is sleeved on the second lead screw 211, and the second nut 213 can move up and down under the driving of the second lead screw 211. The second nut 213 in this embodiment is as required Specially customized, the lower end of the second nut 213 is fixed with a mechanical claw 22, and the feeding device 2 in this embodiment can rotate at the same time. Of course, the first lifting and translation assembly 21 of the present invention can be designed according to the prior art, and can achieve the same effect as that of the present invention, which all belong to the protection scope of the present invention.

Further, the pouring device 3 includes a second lifting and translation assembly 31 and a quantitative suction assembly 32 fixedly connected to the second lifting and translation 31 assembly. The quantitative suction assembly 32 includes a cavity 320, and the cavity 320 has a piston 321. The piston 321 is fixedly connected with a screw assembly for moving the piston 321 up and down. The bottom end of the cavity 320 is provided with a liquid taking pipe 33 , and the lower end of the liquid taking pipe 33 is provided with a liquid taking port, and the liquid taking pipe 33 communicates with the cavity 320 . In this embodiment, the outer edge of the piston 321 is sealed to the inner periphery of the cavity 320, and the cavity 320 is divided into two independent upper chambers 322 and lower chambers 323, and the upper chamber 322 and the lower chamber are There is no gas circulation in 323, when sucking the alloy liquid, move the piston 321 upward to make the lower chamber 323 form a vacuum chamber with a certain negative pressure. According to the demand for the alloy liquid of the casting piece, the alloy liquid in the melting and holding furnace 12 is sucked up into the liquid taking pipe 33 to complete the quantitative liquid taking.

Specifically, the lead screw assembly includes a first motor 324, a first bevel gear 325, a second bevel gear 326, a rotating nut 327 and a first lead screw 328. The first motor 324 is connected to the first bevel gear 325 through a motor shaft, and the first A bevel gear 325 is in driving engagement with the second bevel gear 326 , the rotating nut 327 is fixed on the second bevel gear 326 and rotates coaxially with the second bevel gear 326 , and the first lead screw 328 penetrates the rotating nut 327 and the second bevel gear 326 The gear 326 is fixedly connected with the piston 321 in the cavity 320 , and the first lead screw 328 is rotatably connected with the rotating nut 327 . In this embodiment, the first lead screw 328 is located in the upper chamber 322, the top of the upper chamber 322 has an upper chamber cover, the first motor 324 is located on the upper chamber cover, and the motor shaft is parallel to the upper end surface of the upper chamber cover, The motor shaft is connected with a first bevel gear 325, the axis of the first bevel gear 325 is coincident with the axis of the motor shaft, the second bevel gear 326 is in driving mesh with the first bevel gear 325, and the axis of the second bevel gear 326 is aligned with the first bevel gear 325. The axis of the gear 325 is vertical, the upper end of the second bevel gear 326 is fixedly connected with a rotating nut 327 , one end of the first lead screw 328 is fixedly connected with the piston 321 , and the other end is rotatably connected with the rotating nut 327 through the second bevel gear 326 . Start the first motor 324, the first motor 324 drives the first bevel gear 325 to rotate, the first bevel gear 325 drives the second bevel gear 326 to rotate, the second bevel gear 326 drives the rotating nut 327 to rotate synchronously, and the rotating nut 327 drives the first thread The bar 328 performs vertical linear motion up and down, thereby realizing the up and down movement of the piston. Of course, those skilled in the art can design the screw assembly based on experience, as long as the piston can be driven to move up and down, it all belongs to the protection scope of the present invention.

Specifically, the second lifting and translation assembly 31 includes a second column, a third lead screw fixed on the second column, and a third motor connected to the third lead screw. The third motor drives the third lead screw to rotate, and the third lead screw rotates. A third nut is sleeved on the three lead screws, and the third nut moves up and down under the driving of the third lead screw. The third nut in this embodiment is specially designed, and a quantitative liquid suction component is fixed on the third nut. The second lift-translation assembly of the example can also move horizontally. Of course, the second lifting and translation assembly of the present invention can be designed according to the prior art, and can achieve the same effect as that of the present invention, which all belong to the protection scope of the present invention. It should be noted that the structure of the second lifting and translation assembly 31 is the same as that of the first lifting and translation assembly 21, and can be designed into the same structure. Therefore, the components of the second lifting and translation assembly 31 are not specifically indicated in the figure.

Specifically, the liquid taking pipe 33 is fixedly connected to the lower end of the cavity 320 through a heat insulating flange. The setting of the heat insulation flange can prevent the heat of the alloy liquid in the liquid pipe from being transferred to the lower chamber, resulting in heat dissipation.

Specifically, the liquid taking tube 33 is a sealed silicon carbide liquid taking tube. Silicon carbide liquid pipe has the advantages of high strength, high hardness, good wear resistance, high temperature resistance, corrosion resistance, good thermal shock resistance, high thermal conductivity and good oxidation resistance, etc. It is suitable for containing high temperature alloy liquid.

Further, as shown in Figures 5-6, the new melting furnace also includes a guide tube 4, which is sequentially composed of a corundum ceramic lining 41, a heating wire 42, a fiber thermal insulation sticky cotton 43 and a stainless steel shell 44 from the inside to the outside. , the diameter of the diversion tube is adapted to the outer diameter of the liquid taking tube. The function of the heating wire 42 is to preheat the guide tube 4 to prevent the alloy liquid from dissipating and solidifying during the flow in the guide tube 4 and blocking the pipeline. The fiber thermal insulation sticky cotton is made of aluminum silicate material. The guide tube 4 of this embodiment is fully sealed and has a preheating function, which does not generate air convection when no alloy liquid passes through, which can improve thermal efficiency, and the guide tube 4 uses a heat insulating material to reduce heat dissipation.

Further, the atomization generating device 5 is also included. The atomization generating device 4 is connected with a nitrogen gas pipeline. The end of the nitrogen gas pipeline forms a number of nitrogen gas nozzles 51. The spout 51 is also located at the contact of the guide tube 4 and the liquid taking tube 33 . By introducing nitrogen into the place where the alloy liquid is in contact with the air, the alloy liquid is separated from the air, which can prevent the alloy from oxidizing, improve the alloy quality and reduce the production of oxide slag, reduce the refining process in the traditional process, and significantly improve the environmental protection effect.

The melting furnace of the utility model is designed with miniaturization and integration, and the capacity of the melting and holding furnace in conventional production is reduced from more than 300kg to less than 30kg. Compared with the traditional production equipment, the storage capacity of the superalloy liquid in the equipment is greatly reduced. On the one hand, it saves energy, and on the other hand, it improves the safety performance in the production process.

The specific working process of the present utility model is as follows: the alloy ingot is lifted from the material preparation box 23 and placed in the first melting and holding furnace on the rotary base 11 by the mechanical claw 22 on the first lifting and translation assembly 21, and is melted. After completion, the rotary base 11 is rotated to move the first melting and holding furnace to the pouring position. At this time, the second melting and holding furnace is rotated to the feeding position to perform the feeding process. The quantitative liquid taking assembly 32 on the pouring device 3 moves downwards under the driving of the second lifting and translation assembly 31. When the liquid taking pipe 33 is not immersed in the alloy liquid, the piston 321 is located at the lowermost end of the lower chamber 323, and opens the openable and closable liquid. The small furnace cover 129 makes the liquid taking pipe 33 pass through the inlet and outlet channels 128 to be immersed in the alloy liquid, then the first motor 324 is started, and the rotating nut 327 drives the piston 321 to move upward according to the preset amount, and the lower chamber 323 forms a certain negative pressure. pressure, the quantitative alloy liquid is sucked into the liquid taking pipe 33, after the liquid taking is completed, the quantitative liquid taking assembly 32 moves upward under the driving of the second lifting and translation assembly 31, and the liquid taking pipe 33 is separated from the first melting and holding furnace, The openable and closable furnace cover 129 is closed, and at the same time, the second lifting and translation assembly 31 moves the quantitative suction assembly 32 to the top of the guide pipe 4, so that the liquid inlet of the guide pipe 4 is in contact with the inner diameter of the liquid taking pipe 33, The liquid outlet of the guide tube 4 is connected to the casting piece, and then the first motor 324 is started to move the piston 321 downward, the negative pressure is released, and the alloy liquid flows into the casting piece along the guide tube 4. During the working process, always ensure that nitrogen is introduced into the place where the heat of the alloy may come into contact with the air, so as to improve the quality of the alloy liquid and reduce the generation of oxide slag.

The present utility model has been further described above with the help of specific embodiments, but it should be understood that the specific description here should not be construed as a limitation on the essence and scope of the present utility model. Various modifications made to the above-mentioned embodiments all belong to the protection scope of the present invention.

Claims (10)

1. A novel melting furnace is characterized by comprising:

the melting device comprises a rotary base and at least one melting holding furnace fixed on the rotary base, and the melting holding furnace is used for melting an alloy ingot into an alloy liquid;

the feeding device is used for grabbing alloy ingots and putting the alloy ingots into the melting heat preservation furnace;

and the pouring device is used for sucking the alloy liquid in the melting and heat-preserving furnace and pouring.

2. The melting furnace as claimed in claim 1, wherein the melting and holding furnace is uniformly arranged on the rotary base in the circumferential direction, the melting and holding furnace comprises a furnace cover and a furnace shell, a hearth is arranged in the furnace shell, a crucible inner container is arranged in the hearth, a heating wire and a hearth thermocouple are arranged between the hearth and the crucible inner container, and a molten alloy thermocouple is arranged in the crucible inner container.

3. A novel melting furnace as claimed in claim 2, wherein the furnace cover is provided with an access passage, and the access passage is provided with a small automatically openable and closable furnace cover.

4. The novel melting furnace as claimed in claim 1, wherein the charging device comprises a first lifting and translating assembly and a mechanical claw connected with the first lifting and translating assembly, and the mechanical claw is used for grabbing alloy ingots and is movably placed in the melting and holding furnace.

5. The melting furnace as claimed in claim 3, wherein the pouring device comprises a second elevating and translating assembly and a quantitative liquid taking assembly fixedly connected with the second elevating and translating assembly, the quantitative liquid taking assembly comprises a cavity, a piston is arranged in the cavity, a screw assembly for moving the piston up and down is fixedly connected to the piston, a liquid taking pipe is arranged at the bottom end of the cavity, a liquid taking port is arranged at the lower end of the liquid taking pipe, and the liquid taking pipe is communicated with the cavity.

6. The novel melting furnace of claim 5, wherein the screw assembly comprises a first motor, a first bevel gear, a second bevel gear, a rotating nut and a first screw, the first motor is connected with the first bevel gear through a motor shaft, the first bevel gear is in transmission engagement with the second bevel gear, the rotating nut is fixedly arranged on the second bevel gear and rotates coaxially with the second bevel gear, one end of the first screw passes through the second bevel gear and is in rotating connection with the rotating nut, and the other end of the first screw is fixedly connected with the piston.

7. A novel melting furnace as claimed in claim 5, wherein the liquid take-off tube is fixedly connected to the lower end of the chamber via a heat insulating flange.

8. The melting furnace of claim 5, further comprising a flow guide tube, wherein the flow guide tube comprises a corundum ceramic lining, a heating wire, a fiber heat-insulating viscose cotton and a stainless steel outer shell in sequence from inside to outside, and the caliber of the flow guide tube is adapted to the outer diameter of the liquid taking tube.

9. The novel melting furnace as claimed in claim 8, further comprising an atomization generating device, wherein a nitrogen pipeline is connected to the atomization generating device, and a plurality of nitrogen nozzles are formed at the end of the nitrogen pipeline and located at an access passage of a furnace cover of the melting and holding furnace.

10. The melting furnace of claim 9, wherein the nitrogen port is further located at a contact point between the draft tube and the liquid take-off tube.

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