CN212158118U

CN212158118U - Novel melting furnace

Info

Publication number: CN212158118U
Application number: CN202020481420.7U
Authority: CN
Inventors: 王天良; 王茂锦; 吴帅虎; 王玺懿
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-04-05
Filing date: 2020-04-05
Publication date: 2020-12-15
Anticipated expiration: 2030-04-05

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

Novel melting furnace

Technical Field

The utility model belongs to the technical field of the melting furnace, specifically be a novel melting furnace.

Background

In the existing production process of a melting furnace, an alloy is firstly concentrated in the melting furnace to generate heat through electricity or fossil fuel, so that the alloy is melted into liquid, the melted alloy liquid is injected into an intermediate transfer ladle, the melted alloy liquid is added into a heat preservation furnace through a crane or a forklift for heat preservation, then the alloy liquid in the heat preservation furnace is scooped into a pouring gate of a die casting machine or a die by a manual or pouring mechanical hand through a material bag for die casting or gravity casting production, in the whole process, because the concentrated melting volume is huge, a large amount of heat is dissipated into the air from a furnace wall, so that great heat energy loss is caused, in the transfer process of the alloy liquid, high-temperature liquid at about 700 ℃ is exposed in the air for a plurality of times for a long time, so that more heat energy loss is caused, in the production process, and the alloy liquid can chemically react with oxygen in the air at high temperature to generate oxide slag, not only produces 5-8% raw material loss, but also causes the quality of the alloy liquid to be reduced.

The existing melting furnace equipment needs to be stirred for many times, so that the alloy liquid is exposed in the air, and a large amount of gas and oxidation slag are involved in the alloy liquid, therefore, a refining link for degassing the alloy liquid needs to be added in the production process, and simultaneously, a large amount of smoke and heat which pollute the environment can be generated. In addition, the original equipment needs a large amount of labor to engage in production operation and production preparation work in the processes of material input, smelting and transportation in the production process, and has high working temperature, poor environment and high labor intensity.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem in the above-mentioned background art, the utility model provides a novel melting furnace, integrated reinforced, melting heat preservation, quantitative pouring integration, miniaturized design have reduced the intermediate ring, have shortened production time, and the area that exposes of high temperature alloy liquid reduces greatly, makes heat energy loss reduce by a wide margin, and realizes automatic incessant operation in succession, saves artifical improvement production efficiency and benefit.

The utility model adopts the following technical scheme, 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.

Further, the melting heat preservation furnace circumference is evenly arranged on rotary base, and the melting heat preservation furnace includes bell and stove outer covering, has furnace in the stove outer covering, is equipped with the crucible inner bag in the furnace, is equipped with heating wire and furnace thermocouple between furnace and the crucible inner bag, is equipped with the alloy liquid thermocouple in the crucible inner bag.

Furthermore, an inlet and outlet channel is arranged on the furnace cover, and a small furnace cover capable of automatically opening and closing is arranged on the inlet and outlet channel.

Further, the feeding device comprises a first lifting and translation assembly and a mechanical claw connected with the first lifting and translation assembly, wherein the mechanical claw is used for grabbing the alloy ingot and is movably placed in the melting and heat-preserving furnace.

Further, the pouring device comprises 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 comprises a cavity, a piston is arranged in the cavity, a lead screw assembly enabling the piston to move up and down is fixedly connected onto the piston, a liquid taking pipe is arranged at the bottom end of the cavity, a liquid taking opening is formed in the lower end of the liquid taking pipe, and the liquid taking pipe is communicated with the cavity.

Furthermore, 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 penetrates through the second bevel gear to be in rotating connection with the rotating nut, and the other end of the first screw is fixedly connected with the piston.

Furthermore, the liquid taking pipe is fixedly connected with the lower end of the cavity through a heat insulation flange.

Furthermore, the novel melting furnace also comprises a flow guide pipe, the flow guide pipe sequentially comprises a corundum ceramic lining, an electric heating wire, fiber heat preservation viscose cotton and a stainless steel shell from inside to outside, and the caliber of the flow guide pipe is matched with the outer diameter of the liquid taking pipe.

Furthermore, the device also comprises an atomization generating device, wherein a nitrogen pipeline is connected to the atomization generating device, a plurality of nitrogen nozzles are formed at the tail end of the nitrogen pipeline, and the nitrogen nozzles are positioned at an inlet channel of the furnace cover of the melting holding furnace.

Furthermore, the nitrogen nozzle is also positioned at the contact position of the guide pipe and the liquid taking pipe.

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

(1) the utility model discloses a novel melting furnace will feed in raw material, melt heat preservation, quantitative pouring and carry out integration miniaturized design, has reduced the intermediate link, has shortened production time, and oven surface area and high temperature alloy liquid expose the area and reduce greatly, furthest's reduction heat energy loss.

(2) The melting heat preservation furnace of the novel melting furnace adopts a double-temperature double-control mode, a hearth thermocouple is arranged in a hearth, and a power supply is disconnected after the temperature in the hearth rises to a certain temperature; an alloy liquid thermocouple is arranged in the crucible inner container, and when the alloy liquid rises to a set temperature, the power supply is also cut off, so that the temperature in the melting holding furnace is always kept at the set temperature.

(3) The utility model discloses a novel proportioning device of melting furnace the piston is in the lower extreme of cavity when using, and the liquid taking pipe is in the alloy liquid of melting heat preservation furnace, starts first motor and makes the piston rebound, forms the negative pressure in making the cavity, according to the demand of casting to the alloy liquid, with the melting heat preservation indoor alloy liquid on the suction liquid taking pipe, accomplish the ration and get liquid.

(4) The utility model discloses a novel melting furnace has all let in nitrogen gas in the place of alloy liquid and air contact, makes alloy liquid and air cut off, can stop the alloy oxidation in order to improve the alloy quality and reduce the production of oxidation slag, has reduced the concise link in the traditional handicraft, and environmental protection effect obviously improves.

(5) The utility model discloses a novel melting furnace has increased the little bell that can open and shut in the top of bell, makes the proportioning device only open little bell when absorbing alloy liquid to reduce the area that alloy liquid exposes in the air, made the heat of alloy liquid scatter and disappear and reduce, the oxidation of alloy liquid reduces.

(6) The utility model discloses a novel melting furnace has carried out miniaturization and integrated design, compares traditional production facility, and the memory space greatly reduced of high temperature alloy liquid in equipment, on the one hand energy saving, on the other hand have improved the security performance in the production process.

Drawings

For a clearer explanation of the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of the overall structure of the novel melting furnace of the present invention;

FIG. 2 is a schematic view of the pouring device of the novel melting furnace of the present invention;

FIG. 3 is a schematic view of a screw assembly of the novel melting furnace of the present invention;

FIG. 4 is a schematic view of a melting and holding furnace of the novel melting furnace of the present invention;

FIG. 5 is a schematic view of the structure of the rotary base of the melting furnace of the present invention;

FIG. 6 is a schematic view of a draft tube structure of the novel melting furnace of the present invention;

FIG. 7 is a schematic view of the pouring process of the novel melting furnace of the present invention;

wherein, 1-a melting device, 11-a rotary base, 12-a melting holding furnace, 121-a furnace cover, 122-a furnace shell, 123-a hearth, 124-a crucible inner container, 125-a heating wire, 126-a hearth thermocouple, 127-an alloy liquid thermocouple, 128-an inlet and outlet channel, 129-a small furnace cover, 2-a feeding device, 21-a first lifting and translation component, 210-a first upright post, 211-a second lead screw, 212-a second motor, 213-a second nut, 22-a mechanical claw, 23-a material preparation box, 3-a pouring device, 31-a second lifting and translation component, 32-a quantitative liquid suction component, 320-a cavity, 321-a piston, 322-an upper cavity, 323-a lower cavity, 324-a first motor and 325-a first bevel gear, 326-second bevel gear, 327-rotating nut, 328-first lead screw, 33-liquid taking pipe, 4-honeycomb duct, 41-corundum ceramic lining, 42-heating wire, 43-fiber heat-preservation viscose cotton, 44-stainless steel shell, 5-atomization generating device and 51-nitrogen nozzle.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the present application, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 to 7, the present invention provides a novel melting furnace, comprising: the melting device 1 comprises a rotary base 11 and at least one melting holding furnace 12 fixed on the rotary base 11, wherein the melting holding furnace 12 is used for melting alloy ingots into alloy liquid; the feeding device 2 is used for grabbing alloy ingots and putting the alloy ingots into the melting holding furnace 12; and a pouring device 3 for sucking and melting the alloy liquid in the holding furnace 12 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.

Specifically, as shown in fig. 4, the melting holding furnaces 12 are uniformly arranged on the rotary base 11 in the circumferential direction, a plurality of melting holding furnaces 12 are provided, which can meet the pouring amount requirements of different alloy liquids, when a group of melting holding furnaces 12 is performing pouring operation, other groups of melting holding furnaces 12 are in a melting or holding state to ensure that enough alloy liquid is supplied for pouring at any time, a plurality of groups of melting holding furnaces 12 are uniformly installed on one rotary base 11, and the rotary base 11 can rotate according to a preset mode, so as to move the melting holding furnaces 12 to the pouring or feeding position.

Specifically, the melting and holding furnace 12 of the present embodiment includes a furnace cover 121 and a furnace shell 122, a furnace chamber 123 is provided in the furnace shell 122, a crucible inner container 124 is provided in the furnace chamber 123, a heating wire 125 and a furnace chamber thermocouple 126 are provided between the furnace chamber 123 and the crucible inner container 124, an alloy liquid thermocouple 127 is provided in the crucible inner container 124, an inlet and outlet passage 128 is provided on the furnace cover 121, and a small furnace cover 129 capable of automatically opening and closing is provided on the inlet and outlet passage 128. The melting holding furnace 12 of the embodiment adopts a double-temperature double-control mode, a hearth thermocouple 126 is arranged in a hearth 123, and when the temperature in the hearth rises to a certain temperature, a power supply is cut off; an alloy liquid thermocouple 127 is arranged in the crucible inner container 124, and when the alloy liquid rises to a set temperature, the power supply is also cut off, so that the temperature in the melting holding furnace 12 is always kept at the set temperature; meanwhile, an openable small furnace cover 129 is additionally arranged above the furnace cover 121, so that the pouring device 3 only opens the small furnace cover 129 when absorbing 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 comprises a first lifting and translation assembly 21 and a mechanical claw 22 connected with the first lifting and translation assembly 21, wherein the mechanical claw 22 is used for grabbing the alloy ingot and movably placing the alloy ingot in the melting and holding furnace 12. The feeding device 2 of the embodiment further comprises a material preparing box 23, alloy ingots are placed into the material preparing box 23 for standby, the material preparing box 23 is arranged to be capable of moving in the horizontal direction, so that the alloy ingots to be fed into the melting and heat preserving furnace 12 are just below the mechanical claw 22, the mechanical claw 22 moves downwards under the action of the first lifting and translation assembly 21 to clamp the alloy ingots in the material preparing box 23, the alloy ingots are lifted vertically to a certain height, the lower end of the alloy ingots is separated from the material preparing box 23, the mechanical claw 22 and the alloy ingots move downwards after moving horizontally to the position above the melting and heat preserving furnace 12, the alloy ingots are placed into the melting and heat preserving furnace 12, the mechanical claw 22 is lifted upwards, the furnace cover 121 is closed, and the feeding process is completed. The first lifting and translating assembly 21 of this embodiment includes first stand column 210, the vertical second lead screw 211 of fixing on first stand column 210, and the second motor 212 of being connected with second lead screw 211, second motor 212 drives the rotation of second lead screw 211, the cover is equipped with second nut 213 on the second lead screw 211, second nut 213 can reciprocate under the drive of second lead screw 211, the second nut 213 of this embodiment is special customization as required, the lower extreme of second nut 213 is fixed with gripper 22, the feeding device 2 of this embodiment can realize rotating simultaneously. Of course, the utility model discloses a first lift translation subassembly 21 can design according to prior art, can reach with the utility model discloses the same effect can, all belong to the utility model discloses a protection scope.

Further, pouring device 3 includes that the second goes up and down translation subassembly 31 and goes up and down translation 31 subassembly fixed connection's quantitative imbibition subassembly 32 with the second, and quantitative imbibition subassembly 32 includes a cavity 320, has a piston 321 in the cavity 320, and fixedly connected with makes the lead screw subassembly of piston 321 up-and-down motion on the piston 321, and the bottom of cavity 320 is equipped with liquid taking pipe 33, and liquid taking pipe 33 lower extreme is equipped with the liquid taking mouth, and liquid taking pipe 33 communicates with cavity 320. In this embodiment, the outer edge of the piston 321 is hermetically connected to the inner periphery of the chamber 320, the chamber 320 is divided into two independent upper chamber 322 and lower chamber 323, and there is no gas communication between the upper chamber 322 and the lower chamber 323, and when the alloy liquid is sucked, the piston 321 is moved upward to form a vacuum chamber in the lower chamber 323, and a certain negative pressure is provided. According to the demand of the casting piece for the alloy liquid, the alloy liquid in the melting holding furnace 12 is sucked into the liquid taking pipe 33, and the quantitative liquid taking is completed.

Specifically, the screw assembly includes a first motor 324, a first bevel gear 325, a second bevel gear 326, a rotating nut 327 and a first screw 328, the first motor 324 is connected to the first bevel gear 325 through a motor shaft, the first bevel gear 325 is in transmission engagement with the second bevel gear 326, the rotating nut 327 is fixedly disposed on the second bevel gear 326 and rotates coaxially with the second bevel gear 326, the first screw 328 penetrates through the rotating nut 327 and the second bevel gear 326 and is fixedly connected to the piston 321 in the cavity 320, and the first screw 328 is rotatably connected to the rotating nut 327. In this embodiment, a first lead screw 328 is located in the upper chamber 322, an upper chamber cover is arranged at the top end of the upper chamber 322, a first motor 324 is located on the upper chamber cover, a 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 overlapped with the axis of the motor shaft, a second bevel gear 326 is in transmission engagement with the first bevel gear 325, the axis of the second bevel gear 326 is perpendicular to the axis of the first bevel gear 325, 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 a piston 321, and the other end of the first lead screw passes through the second bevel gear. The first motor 324 is started, 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 synchronously rotate, and the rotating nut 327 drives the first lead screw 328 to vertically and linearly move up and down, so that the piston is moved up and down. Of course, those skilled in the art can design the screw assembly according to experience as long as the piston can be driven to move up and down, and all of them belong to the protection scope of the present invention.

Specifically, second lift translation subassembly 31 includes the second stand, the fixed third lead screw that sets up on the second stand to and the third motor of being connected with the third lead screw, third motor drive third lead screw rotates, the cover is equipped with the third nut on the third lead screw, the third nut reciprocates under the drive of third lead screw, the third nut of this embodiment is special design, be fixed with quantitative imbibition subassembly on the third nut, the second lift translation subassembly of this embodiment can also horizontal migration simultaneously. Of course, the utility model discloses a second lift translation subassembly can design according to prior art, can reach with the utility model discloses the same effect can, all belong to the utility model discloses a protection scope. It should be noted that the second elevation translation assembly 31 has the same structure as the first elevation translation assembly 21, and the same structure can be designed, so that the components of the second elevation translation assembly 31 are not specifically indicated in the drawings.

Specifically, the liquid-taking tube 33 is fixedly connected with the lower end of the cavity 320 through a heat-insulating flange. The heat of the alloy liquid in the liquid taking pipe can be prevented from being transferred to the lower cavity by the arrangement of the heat insulation flange, so that heat is prevented from being dissipated.

Specifically, the liquid extraction pipe 33 is a sealed silicon carbide liquid extraction pipe. The silicon carbide liquid taking tube has the advantages of high strength, high hardness, good wear resistance, high temperature resistance, corrosion resistance, good heat and shock resistance, large heat conductivity coefficient, good oxidation resistance and the like, and is suitable for containing high-temperature alloy liquid.

Further, as shown in fig. 5-6, the novel melting furnace further comprises a flow guide tube 4, the flow guide tube 4 comprises a corundum ceramic lining 41, a heating wire 42, fiber heat-insulating viscose cotton 43 and a stainless steel shell 44 from inside to outside in sequence, and the caliber of the flow guide tube is matched with the outer diameter of the liquid taking tube. The heating wire 42 is used for preheating the draft tube 4 to prevent the alloy liquid from radiating and solidifying to block the pipeline in the flowing process of the draft tube 4, and the fiber heat-insulating viscose cotton is aluminum silicate material. The honeycomb duct 4 of this embodiment adopts totally enclosed and has the preheating function, does not produce the air convection when no alloy liquid passes through, can improve the thermal efficiency, and honeycomb duct 4 adopts the heat-insulating material moreover, can reduce thermal giving off.

Further, the device also comprises an atomization generating device 5, a nitrogen pipeline is connected to the atomization generating device 4, a plurality of nitrogen nozzles 51 are formed at the tail end of the nitrogen pipeline, the nitrogen nozzles 51 are positioned at the inlet and outlet channel 128 of the melting holding furnace cover 121, and the nitrogen nozzles 51 are also positioned at the contact position of the guide pipe 4 and the liquid taking pipe 33. The nitrogen is introduced into the place where the alloy liquid contacts with the air, so that the alloy liquid is separated from the air, the alloy oxidation can be avoided, the alloy quality is improved, the generation of oxidation slag is reduced, the refining link in the traditional process is reduced, and the environmental protection effect is obviously improved.

The utility model discloses a melting furnace has carried out miniaturization and integrated design, and with melting holding furnace capacity in the conventional production by more than 300kg fall to below 30kg, compare traditional production facility, the memory space greatly reduced of high temperature alloy liquid in equipment, on the one hand energy saving, on the other hand has improved the security performance in the production process.

The utility model discloses a concrete working process as follows: alloy ingots are lifted from a material preparing box 23 by a mechanical claw 22 on a first lifting translation assembly 21 and placed in a first melting holding furnace on a rotary base 11 for melting, the rotary base 11 is rotated after the melting is completed to enable the first melting holding furnace to move to a pouring position, and at the moment, a second melting holding furnace rotates to a feeding position for feeding. The quantitative liquid taking component 32 on the pouring device 3 is driven by the second lifting and translating component 31 to move downwards, when the liquid taking pipe 33 is not immersed in the alloy liquid, the piston 321 is positioned at the lowest end of the lower chamber 323, the openable small furnace cover 129 is opened, the liquid taking pipe 33 is immersed in the alloy liquid through the access passage 128, then the first motor 324 is started, the rotating nut 327 drives the piston 321 to move upwards according to the preset amount, the lower chamber 323 forms a certain negative pressure, the quantitative alloy liquid is sucked into the liquid taking pipe 33, after the liquid taking is finished, the quantitative liquid taking component 32 is driven by the second lifting and translating component 31 to move upwards, the liquid taking pipe 33 is separated from the first melting and heat preserving furnace cover, the openable small furnace cover 129 is closed, meanwhile, the second lifting and translating component 31 moves the quantitative liquid taking component 32 to the upper part of the guide pipe 4, and the liquid suction inlet of the guide pipe 4 is in contact with the inner diameter of the liquid taking pipe, the liquid outlet of the draft tube 4 is communicated with the casting piece, then the first motor 324 is started to enable the piston 321 to move downwards, the negative pressure is relieved, the alloy liquid flows into the casting piece along the draft tube 4, the nitrogen is always ensured to be introduced at the place where the alloy heat is likely to contact with the air in the whole working process of the melting furnace, the quality of the alloy liquid is improved, and the generation of oxidation slag is reduced.

The present invention has been further described with reference to specific embodiments, but it should be understood that the specific description herein should not be construed as limiting the spirit and scope of the present invention, and that various modifications to the above-described embodiments, which would occur to persons skilled in the art after reading this specification, are within the scope of the present invention.

Claims

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.