阅读说明：本技术 一种采用真空阀的铜钢复合阴极钢棒的制造工艺 (Manufacturing process of copper-steel composite cathode steel bar adopting vacuum valve ) 是由 黄文强 于 2021-01-19 设计创作，主要内容包括：本发明涉及一种采用真空阀的铜钢复合阴极钢棒的制造工艺,包括：热熔：将铜材和钢材用真空熔炼炉加热熔化,得到混合熔体；铸件：将加热熔化后的混合熔体加入到离心铸造设备的铸型中进行离心复合铸造,在铸型内形成一个双层且呈环形的铸件,所述铸件内层为钢材层,所述铸件的外层为铜材层；脱型：铸型内的混合熔体形成一个铸件后,将铸型从离心铸造设备中取下埋入沙堆中缓慢冷却至室温,冷却至室温后,然后将铸件从铸型中取出；热变形：将取出的铸件后,沿铸件的径向将铸件切开,对切开的铸件进行加热变形,将铸件加工成一面覆铜的板状件；轧制加工：将一面覆铜的板状件进行轧制加工,得到电解用铜钢复合阴极钢棒成品。(The invention relates to a manufacturing process of a copper-steel composite cathode steel bar by using a vacuum valve, which comprises the following steps: hot melting: heating and melting copper materials and steel materials by using a vacuum melting furnace to obtain a mixed melt; casting: adding the heated and melted mixed melt into a casting mold of centrifugal casting equipment for centrifugal composite casting, and forming a double-layer annular casting in the casting mold, wherein the inner layer of the casting is a steel layer, and the outer layer of the casting is a copper layer; demoulding: after the mixed melt in the casting mold forms a casting, taking the casting mold from centrifugal casting equipment, embedding the casting mold into a sand pile, slowly cooling to room temperature, and then taking the casting mold out of the casting mold after cooling to room temperature; thermal deformation: cutting the taken casting along the radial direction of the casting, heating and deforming the cut casting, and processing the casting into a plate-shaped part with one copper-coated surface; rolling and processing: and rolling the plate-shaped part coated with copper on one surface to obtain the finished copper-steel composite cathode steel bar for electrolysis.)

1. A manufacturing process of a copper-steel composite cathode steel bar by using a vacuum valve is characterized by comprising the following steps:

A. hot melting: heating and melting copper materials and steel materials by using a vacuum melting furnace to obtain a mixed melt;

B. casting: adding the heated and melted mixed melt into a casting mold of centrifugal casting equipment for centrifugal composite casting, and forming a double-layer annular casting in the casting mold, wherein the inner layer of the casting is a steel layer, and the outer layer of the casting is a copper layer;

C. demoulding: after the mixed melt in the casting mold forms a casting, taking the casting mold from centrifugal casting equipment, embedding the casting mold into a sand pile, slowly cooling to room temperature, and then taking the casting mold out of the casting mold after cooling to room temperature;

D. thermal deformation: cutting the taken casting along the radial direction of the casting, heating and deforming the cut casting, and processing the casting into a plate-shaped part with one copper-coated surface;

E. rolling and processing: rolling and processing a plate-shaped part coated with copper on one surface to obtain a finished copper-steel composite cathode steel bar for electrolysis;

the vacuum smelting furnace in the manufacturing process step A of the copper-steel composite cathode steel bar with the vacuum valve comprises the following steps:

the furnace body (1), the furnace body (1) includes the outer casing (10), feed tube (11) and vacuum valve storehouse (12); the vacuum valve bin (12) comprises a vacuum valve bin shell (120) and a vacuum valve (121), one end of the vacuum valve (121) penetrates through the vacuum valve bin shell (120) and is movably connected with the vacuum valve bin shell, a discharge hole (101) is formed in the lower end of the right side of the shell (10), a discharge door (102) movably connected with the discharge hole (101) is arranged on the outer side of the discharge hole (101), the upper end of the vacuum valve bin (12) is fixedly connected with the feeding pipe (11), and the lower end of the vacuum valve bin penetrates through the top wall of the shell (10) and is fixedly connected with the top wall of the shell;

the smelting furnace (2) is fixedly connected to the inner side of the bottom wall of the furnace body (1), a Z-shaped bottom plate (20) is arranged at the bottom of the smelting furnace (2), an electric arc preheating electrode (201) is fixedly connected to the bottom of the bottom plate (20), and a partition plate (23) which divides the interior of the smelting furnace (2) into a main smelting furnace (21) and an auxiliary smelting furnace (22) is fixedly connected to the smelting furnace;

linkage portion (3), linkage portion (3) are located furnace body (1) inside upper end, it includes filler subassembly (30), stirring subassembly (31), conduction subassembly (32) and tractive subassembly (33), filler subassembly (30) are including pivot (301) and fly leaf (302), pivot (301) both ends penetrate respectively fly leaf (302) intermediate position and rotate rather than being connected, just pivot (301) both ends respectively fixed connection in on furnace body (1) inner wall, stirring subassembly (31) upper end fixed connection in fly leaf (302) right-hand member diapire intermediate position, conduction subassembly (32) respectively with vacuum valve storehouse casing (120) with fly leaf (302) fixed connection, tractive subassembly (33) respectively with fly leaf (302) with discharge door (102) fixed connection.

2. The manufacturing process of the copper-steel composite cathode steel bar adopting the vacuum valve as claimed in claim 1, is characterized in that:

the stirring assembly (31) comprises a connecting rod (310), a dislocation plate (311), a loop bar (312) and stirring blades (313);

connecting rod (310) upper end fixed connection in fly leaf (302) right-hand member intermediate position, its lower extreme fixed connection in dislocation board (311) intermediate position, loop bar (312) include outer pole (3120) and interior pole (3121) of female connection, interior pole (3121) upper end fixed connection in dislocation board (311) diapire intermediate position, outer pole lower extreme fixed connection in stirring vane (313) intermediate position.

3. The manufacturing process of the copper-steel composite cathode steel bar adopting the vacuum valve as claimed in claim 2, is characterized in that:

the conducting assembly (32) comprises a rotating wheel (320), a rotating shaft (321), a metal conducting wire (322) and two fixing arms (323);

the rotating shaft (321) is fixedly connected to the middle position of the rotating wheel (320) and two ends of the rotating wheel (320) penetrate through the rotating wheel (320), one end of each fixing arm (323) is respectively and rotatably connected to two ends of the rotating shaft (321), the other end of each fixing arm is fixedly connected to the vacuum valve cabin shell (120), one end of each metal conducting wire (322) is fixedly connected with the rotating shaft (321), one end of each metal conducting wire penetrates through the top wall of the shell (10) and is fixedly connected to the right end of the corresponding movable plate (302), and the rotating wheel (320) is meshed with the vacuum valve (121).

4. The manufacturing process of the copper-steel composite cathode steel bar adopting the vacuum valve as claimed in claim 3, is characterized in that:

the traction assembly (33) comprises a guide wheel (330), a guide plate (331) and a traction line (332), wherein the guide wheel (330) is fixed on the inner wall of the right side wall of the shell (10) and is positioned at the lower end of the movable plate (302), the guide plate (331) is fixedly connected on the outer wall of the right side wall of the shell (10), one end of the traction line (332) is fixedly connected on the bottom wall of the right end of the movable plate (302), and the other end of the traction line (332) passes through the guide wheel (330) and the guide plate (331) and is fixedly connected at the right end of the top wall of the discharge door (102).

5. The manufacturing process of the copper-steel composite cathode steel bar adopting the vacuum valve as claimed in claim 4, is characterized in that:

the height of the guide plate (331) in the vertical direction is smaller than that of the guide wheel (330).

6. The manufacturing process of the copper-steel composite cathode steel bar adopting the vacuum valve as claimed in claim 5, is characterized in that:

discharge door (102) one end hinge connection in discharge gate (101) upper end, the other end through two sets of springs (1020) fixed connection in discharge gate (101) both sides lateral wall is last.

7. The manufacturing process of the copper-steel composite cathode steel bar adopting the vacuum valve as claimed in claim 6, is characterized in that:

the lower end of the clapboard (23) is provided with a metal liquid inlet (230).

Technical Field

The invention relates to the technical field of cathode steel bars, in particular to a manufacturing process of a copper-steel composite cathode steel bar adopting a vacuum valve.

Background

In the manufacturing process of the copper-steel composite cathode steel bar, materials are required to be melted to obtain a mixed melt, and a vacuum melting furnace is one of indispensable apparatuses in the melting process.

The traditional smelting furnace is only provided with one furnace chamber, the secondary smelting can be carried out after the molten metal is led out after the materials are smelted, the processes of manually and repeatedly opening a vacuum valve, filling, closing the vacuum valve, smelting and leading out the molten metal are needed during the secondary smelting, the process is time-consuming and labor-consuming, the repeated opening and closing of a power supply is also a strong loss of a smelting appliance, and a numerical control automatic device with continuous smelting is extremely high in intelligence, expensive in manufacturing cost and not suitable for being used in a small part of factories.

Disclosure of Invention

(1) Technical problem to be solved

The invention aims to overcome the defects of the prior art, adapt to the practical requirements and provide a manufacturing process of a copper-steel composite cathode steel bar by adopting a vacuum valve so as to solve the technical problems.

(2) Technical scheme

In order to realize the purpose of the invention, the technical scheme adopted by the invention is that the manufacturing process of the copper-steel composite cathode steel bar adopting the vacuum valve comprises the following steps:

A. hot melting: heating and melting copper materials and steel materials by using a vacuum melting furnace to obtain a mixed melt;

B. casting: adding the heated and melted mixed melt into a casting mold of centrifugal casting equipment for centrifugal composite casting, and forming a double-layer annular casting in the casting mold, wherein the inner layer of the casting is a steel layer, and the outer layer of the casting is a copper layer;

C. demoulding: after the mixed melt in the casting mold forms a casting, taking the casting mold from centrifugal casting equipment, embedding the casting mold into a sand pile, slowly cooling to room temperature, and then taking the casting mold out of the casting mold after cooling to room temperature;

D. thermal deformation: cutting the taken casting along the radial direction of the casting, heating and deforming the cut casting, and processing the casting into a plate-shaped part with one copper-coated surface;

E. rolling and processing: rolling and processing a plate-shaped part coated with copper on one surface to obtain a finished copper-steel composite cathode steel bar for electrolysis;

the vacuum smelting furnace in the manufacturing process step A of the copper-steel composite cathode steel bar adopting the vacuum valve comprises the following steps:

the furnace body comprises a shell, a feeding pipe and a vacuum valve bin; the vacuum valve cabin comprises a vacuum valve cabin shell and a vacuum valve, one end of the vacuum valve penetrates through the vacuum valve cabin shell and is movably connected with the vacuum valve cabin shell, the lower end of the right side of the shell is provided with a discharge hole, the outer side of the discharge hole is provided with a discharge door movably connected with the discharge hole, the upper end of the vacuum valve cabin is fixedly connected with the feeding pipe, and the lower end of the vacuum valve cabin penetrates through the top wall of the shell and is fixedly connected;

the smelting furnace is fixedly connected to the inner side of the bottom wall of the furnace body, a Z-shaped bottom plate is arranged at the bottom of the smelting furnace, an electric arc preheating electrode is fixedly connected to the bottom of the bottom plate, and the smelting furnace is fixedly connected with a partition plate which divides the interior of the smelting furnace into a main smelting furnace and an auxiliary smelting furnace;

the linkage portion, the linkage portion is located the inside upper end of furnace body, and it includes filler subassembly, stirring subassembly, conduction subassembly and tractive subassembly, and the filler subassembly includes pivot and fly leaf, and the pivot both ends penetrate the fly leaf intermediate position respectively and rotate rather than being connected, and pivot both ends respectively fixed connection on the furnace body inner wall, stirring subassembly upper end fixed connection in fly leaf right-hand member diapire intermediate position, the conduction subassembly respectively with vacuum valve storehouse casing and fly leaf fixed connection, the tractive subassembly respectively with fly leaf and discharge door fixed connection.

Preferably, the stirring assembly comprises a connecting rod, a dislocation plate, a sleeve rod and a stirring blade;

connecting rod upper end fixed connection is in fly leaf right-hand member intermediate position, and its lower extreme fixed connection is in dislocation board intermediate position, and the loop bar includes female connection's outer pole and interior pole, interior pole upper end fixed connection in dislocation board diapire intermediate position, outer pole lower extreme fixed connection in stirring vane intermediate position.

Preferably, the conducting assembly comprises a rotating wheel, a rotating shaft, a metal conducting wire and two fixing arms;

the rotating shaft is fixedly connected to the middle of the rotating wheel, two ends of the rotating wheel penetrate through the rotating wheel, one ends of the two fixing arms are respectively connected to two ends of the rotating shaft in a rotating mode, the other ends of the two fixing arms are fixedly connected to the shell of the vacuum valve cabin, one end of the metal conducting wire is fixedly connected with the rotating shaft, one end of the metal conducting wire penetrates through the top wall of the shell and is fixedly connected to the right end of the movable plate, and.

Preferably, the traction assembly comprises a guide wheel, a guide plate and a traction line, the guide wheel is fixed on the inner wall of the right side wall of the shell and is located at the lower end of the movable plate, the guide plate is fixedly connected on the outer wall of the right side wall of the shell, one end of the traction line is fixedly connected to the bottom wall of the right end of the movable plate, and the other end of the traction line is fixedly connected to the right end of the top wall of the discharge door through the guide wheel.

Preferably, the height of the guide plate in the vertical direction is smaller than that of the guide wheel in the vertical direction.

Preferably, discharge door one end hinge connection is in the discharge gate upper end, and the other end passes through two sets of spring fixed connection on the discharge gate both sides lateral wall.

Preferably, the lower end of the partition plate is provided with a metal liquid inlet.

(3) Has the advantages that:

A. according to the manufacturing process of the copper-steel composite cathode steel bar adopting the vacuum valve, the automatic addition of steel is realized through the use of the packing assembly and the conduction assembly, the inclination of the movable plate is changed through the weight of the steel and the molten metal height in the auxiliary smelting furnace, and further, the selective automatic addition of the steel according to the actual condition in the smelting furnace is realized.

B. According to the manufacturing process of the copper-steel composite cathode steel bar adopting the vacuum valve, due to the adoption of the stirring assembly and the traction assembly, when the stirring blade drives the stirring blade to rotate through the change of the inclination of the movable plate by means of mechanical transmission, the smelted molten metal is stirred, gas in the molten metal is discharged as much as possible, and the discharge door is opened in the stirring process to discharge the molten metal, so that the manual operation is reduced, and the purposes of saving time and labor are achieved.

Drawings

FIG. 1 is a schematic sectional view of a vacuum melting furnace according to an embodiment of the present invention;

FIG. 2 is a schematic view of the overall structure of a vacuum melting furnace according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a loop bar according to an embodiment of the present invention;

FIG. 4 is an enlarged schematic view of the structure at A in FIG. 1;

FIG. 5 is an enlarged schematic view of the structure at B in FIG. 2;

fig. 6 is an enlarged schematic view of the structure at C in fig. 1.

The reference numbers are as follows:

1. a furnace body; 10. a housing; 101. a discharge port; 102. a discharge door; 1020. a spring; 11. a feed tube; 12. a vacuum valve chamber; 120. a vacuum valve cartridge housing; 121. a vacuum valve;

2. a smelting furnace; 20. a Z-shaped bottom plate; 201. an arc preheating electrode; 21. a main smelting furnace; 22. an auxiliary smelting furnace; 23. a partition plate; 230. a metal liquid stream inlet;

3. a linkage section; 30. a packing assembly; 301. a rotating shaft; 302. a movable plate; 31. a stirring assembly; 310. a connecting rod; 311. a dislocation plate; 312. a loop bar; 3120. an outer rod; 3121. an inner rod; 313. a stirring blade; 32. a conductive component; 320. a rotating wheel; 321. a rotating shaft; 322. a metal conductive line; 323. a fixed arm; 33. a pulling assembly; 330. a guide wheel; 331. a guide plate; 332. a pulling wire;

Detailed Description

The invention will be further described with reference to the accompanying figures 1 to 6 and examples:

a manufacturing process of a copper-steel composite cathode steel bar adopting a vacuum valve comprises the following steps:

A. hot melting: heating and melting copper materials and steel materials by using a vacuum melting furnace to obtain a mixed melt;

B. casting: adding the heated and melted mixed melt into a casting mold of centrifugal casting equipment for centrifugal composite casting, and forming a double-layer annular casting in the casting mold, wherein the inner layer of the casting is a steel layer, and the outer layer of the casting is a copper layer;

C. demoulding: after the mixed melt in the casting mold forms a casting, taking the casting mold from centrifugal casting equipment, embedding the casting mold into a sand pile, slowly cooling to room temperature, and then taking the casting mold out of the casting mold after cooling to room temperature;

D. thermal deformation: cutting the taken casting along the radial direction of the casting, heating and deforming the cut casting, and processing the casting into a plate-shaped part with one copper-coated surface;

E. rolling and processing: rolling and processing a plate-shaped part coated with copper on one surface to obtain a finished copper-steel composite cathode steel bar for electrolysis;

the vacuum smelting furnace in the manufacturing process step A of the copper-steel composite cathode steel bar with the vacuum valve comprises the following steps:

the furnace comprises a furnace body 1, wherein the furnace body 1 comprises a shell 10, a feeding pipe 11 and a vacuum valve bin 12; the vacuum valve cabin 12 comprises a vacuum valve cabin shell 120 and a vacuum valve 121, one end of the vacuum valve 121 penetrates through the vacuum valve cabin shell 120 and is movably connected with the vacuum valve cabin shell, a discharge hole 101 is formed in the lower end of the right side of the shell 10, a discharge door 102 movably connected with the discharge hole 101 is arranged on the outer side of the discharge hole 101, the upper end of the vacuum valve cabin 12 is fixedly connected with the feeding pipe 11, and the lower end of the vacuum valve cabin penetrates through the top wall of the shell 10 and is fixedly connected with the top wall of the shell;

the smelting furnace 2 is fixedly connected to the inner side of the bottom wall of the furnace body 1, a Z-shaped bottom plate 20 is arranged at the bottom of the smelting furnace 2, an electric arc preheating electrode 201 is fixedly connected to the bottom of the bottom plate 20, and a partition plate 23 which divides the interior of the smelting furnace 2 into a main smelting furnace 21 and an auxiliary smelting furnace 22 is fixedly connected to the smelting furnace 2;

linkage portion 3, linkage portion 3 is located the inside upper end of furnace body 1, and it includes filler subassembly 30, stirring subassembly 31, conduction subassembly 32 and tractive subassembly 33, filler subassembly 30 includes pivot 301 and fly leaf 302, pivot 301 both ends penetrate respectively fly leaf 302 intermediate position just rather than rotate and be connected, just pivot 301 both ends respectively fixed connection in on the furnace body 1 inner wall, stirring subassembly 31 upper end fixed connection in fly leaf 302 right-hand member diapire intermediate position, conduction subassembly 32 respectively with vacuum valve storehouse casing 120 with fly leaf 302 fixed connection, tractive subassembly 33 respectively with fly leaf 302 with discharge door 102 fixed connection.

Specifically, a discharge hopper prepared in advance is connected to the upper end of the charging pipe 11, when the first cylinder material in the main smelting furnace 21 is smelted, because the Z-shaped bottom plate 20 is arranged at the high left and the low right, the smelted molten metal flows into the auxiliary smelting furnace 22 through the molten metal inlet 230 at the bottom of the partition plate 23, when the molten metal reaches a certain degree, the dislocation plate 311 is slowly jacked up, the dislocation plate 311 drives the inner rod 3121 to move upwards, because the inner rod 3121 is connected with the internal thread of the outer rod 3120, the stirring blade 313 rotates slowly, at this time, the dislocation plate 311 pushes the right end of the movable plate 302 to rotate upwards through the connecting rod 310, the left end of the movable plate 302 rotates downwards, and because of the inclination of the movable plate 302, the steel falling at the right end of the movable plate 302 slides into the main smelting furnace 21 in advance, because of the arrangement of the spiral spring in the rotating shaft 321, when the right end of, the linear distance between the metal conducting wire 322 and the rotating shaft 321 is shortened, the metal conducting wire 322 is wound on the rotating shaft 321 in the process of the recovery rotation of the rotating shaft 321, when the rotating shaft 321 rotates, the rotating wheel 320 is driven to rotate, the rotating wheel 320 rotates to drive the vacuum valve 121 to move rightwards through the meshing connection, when the molten metal in the auxiliary smelting furnace 22 reaches a certain level, the vacuum valve 121 is indirectly opened, the steel prepared in advance at the upper end of the vacuum valve 121 falls to the right end of the movable plate 302, at the same time, the pulling wire 332 connected with the right end of the movable plate 302 just pulls the discharging door 102 open, when the steel falls to the right end of the movable plate 302, the weight of the steel rapidly presses the movable plate 302 downwards to rotate until the right end of the movable plate 302 is blocked by the guide wheel 330 and cannot rotate, and when the movable plate 302 rotates, the connecting rod 310 presses the dislocation plate 311 downwards, the dislocation plate 311 drives the inner, under the action of the internal thread connection, the outer rod 3120 rotates rapidly and drives the stirring blade 313 to rotate rapidly, the rapid rotation of the stirring blade 313 separates the molten metal and the gas in the molten metal by stirring, and the rapid rotation of the stirring blade 313 rapidly extrudes the molten metal from the discharge hole 101 by the pressure of the stirring and the downward movement of the dislocation plate 311, so that the molten metal flows into a steel bar die which is connected in advance and is cooled and formed, and along with the downward rotation of the right end of the movable plate 302, the metal conducting wire 322 is pulled downwards and the pulling force of the pulling wire 332 is rapidly released, the metal conducting wire 322 drives the rotating wheel 320 to rotate under the action of the pulling force, the rotating wheel 320 rotates to close the vacuum valve 121 through the meshing action, the excessive steel is prevented from falling, the pulling wire 322 which releases the pulling force does not generate the pulling force on the discharge door 102 any more, the discharge door 102 is closed again under the action of the elastic force of the spring 1020, and, The smelting and the liquid discharging process realize the manufacture of continuous melting materials and steel bars.

Specifically, the stirring assembly 31 comprises a connecting rod 310, an offset plate 311, a sleeve rod 312 and a stirring blade 313;

the upper end of the connecting rod 310 is fixedly connected to the middle position of the right end of the movable plate 302, the lower end of the connecting rod is fixedly connected to the middle position of the dislocation plate 311, the sleeve rod 312 comprises an outer rod 3120 and an inner rod 3121 which are connected through internal threads, the upper end of the inner rod 3121 is fixedly connected to the middle position of the bottom wall of the dislocation plate 311, and the lower end of the outer rod is fixedly connected to the middle position of the stirring blade 313.

The upward acting force of the molten metal pushes the dislocation plate 311 to move upwards, the dislocation plate 311 drives the inner rod 3121 to move upwards and drives the movable plate 302 to rotate respectively, when the movable plate 302 is under the gravity of steel, pressure is reversely applied to the dislocation plate 311, the inner rod 3121 is driven to move downwards by the pressure of the dislocation plate 311, the outer rod 3120 is driven to rotate by the threaded connection relationship of the inner rod 3121 and the outer rod 3120, and the stirring blades 313 are driven to rotate to stir the liquid.

Specifically, the conducting assembly 32 includes a rotating wheel 320, a rotating shaft 321, a metal conducting wire 322 and two fixing arms 323;

the rotating shaft 321 is fixedly connected to the middle of the rotating wheel 320, two ends of the rotating shaft 320 penetrate through the rotating wheel 320, one ends of the two fixing arms 323 are respectively and rotatably connected to two ends of the rotating shaft 321, the other ends of the two fixing arms are fixedly connected to the vacuum valve chamber housing 120, one end of the metal conducting wire 322 is fixedly connected to the rotating shaft 321, the other end of the metal conducting wire penetrates through the top wall of the housing 10 and is fixedly connected to the right end of the movable plate 302, and the rotating wheel 320 is engaged with the vacuum valve 121.

In the rotating process of the movable plate 302, the rotating direction of the rotating shaft 321 is controlled by the tension applied to the spiral spring inside the rotating shaft 321 and the metal conducting wire 322, the rotating direction of the rotating wheel 320 is kept consistent with the rotating direction under the driving of the rotating shaft 321, the rotating wheel 320 rotates to drive the vacuum valve 121 engaged with the rotating wheel to move, so that the vacuum valve 121 is opened and closed, and the falling time of the steel and the amount of the falling steel are controlled.

Specifically, the pulling assembly 33 includes a guide wheel 330, a guide plate 331 and a pulling line 332, the guide wheel 330 is fixed on the inner wall of the right side wall of the housing 10 and located at the lower end of the movable plate 302, the guide plate 331 is fixedly connected to the outer wall of the right side wall of the housing 10, one end of the pulling line 332 is fixedly connected to the bottom wall of the right end of the movable plate 302, and the other end of the pulling line is fixedly connected to the right end of the top wall of the discharge door 102 through the guide wheel 330 and the guide plate 331.

The pulling and the tensile release of the pulling line 332 are realized through the rotation of the movable plate 302, when the pulling line 332 is pulled, the pulling force reaches a certain degree and can be greater than the pulling force of the spring 1020, so that the discharging door 102 is opened, the molten metal in the auxiliary smelting furnace 22 is rapidly discharged under the assistance of the dislocation plate 311 and the stirring blades 313, when the pulling line 332 is in the process that the movable plate 302 releases the pulling force, the elastic force of the spring 1020 is greater than the pulling force of the pulling line 332, the discharging door 102 is closed under the elastic force action of the spring 1020, and the situation that the molten metal in the auxiliary smelting furnace 22 is mistakenly discharged to cause the steel bar to be incapable of being formed and further wasting the molten metal is avoided.

Specifically, the height of the guide plate 331 in the vertical direction is smaller than the height of the guide wheel 330 in the vertical direction, and the height difference between the guide plate 331 and the guide wheel 330 can effectively control the tension forming of the pulling line 332.

Specifically, one end of the discharge door 102 is connected to the upper end of the discharge hole 101 through a hinge, and the other end of the discharge door is fixedly connected to the side walls of the two sides of the discharge hole 101 through two groups of springs 1020; the opening and closing of the discharging door 102 are realized by the difference between the tension of the pulling wire 332 in different states and the elastic force of the spring 1020.

Specifically, the lower end of the partition plate 23 is provided with a metal liquid inlet 230; the molten metal melted in the main melting furnace 21 flows into the sub-melting furnace 22 through the molten metal inflow port 230 at the lower end of the divider 23.

The embodiments of the present invention are disclosed as the preferred embodiments, but not limited thereto, and those skilled in the art can easily understand the spirit of the present invention and make various extensions and changes without departing from the spirit of the present invention.