TW201312071A - Metal melting furnace and metal melting method - Google Patents

Abstract

The present invention relates to a metal melting furnace and a metal melting method. The metal melting furnace includes a heating furnace, a melting furnace installed on the heating furnace, a thermal storage type combustion system, a material feeding device and a circulation slurry-pumping soup-supplying device disposed on the melting furnace. The thermal storage type combustion system not only can heat up the heating furnace, but also can store high temperature gas of the heating furnace in a thermal storage body to further improve the furnace thermal efficiency, and guide residual heat of the thermal storage body to the material feeding device further to heat up granular/sheet-shaped metal material of the feeding device. Not only waste heat can be sufficiently recycled, but also the preheated metal material can be further pushed into the melting furnace for heating to liquid state. According to the design, the present invention can sufficiently recycle heat, and reduce time and energy (fuel) required for heating the metal material to the liquid state, such that processes of preheating and melting the metal material and poring the metal material into a mold are time saving, smooth, and can be performed continuously with a high degree of security.

Description

Metal melting furnace and metal melting method

The present invention relates to a "metal melting furnace" and a "metal melting method" in which a particulate or sheet metal material is preheated by residual heat generated in a melting furnace, and then the metal material is further heated and melted.

In the prior art method for melting metal, the metal ingot, the strip or the scrap is directly preheated and then put into a boiler for heating. After the metal material is melted and completely mixed, the liquid in the boiler is further charged. The metal is injected into the cavity of the mold to form a solidification.

However, the above-described conventional steps of casting a metal product have a problem in that, first, since the ingot-shaped or strip-shaped metal material is directly heated into the boiler at a normal temperature, it takes a long time to heat up to reach a molten state. The process is very time consuming; secondly, because the liquid metal is injected into the mold by means of artificial or mechanical arm soup, and because the temperature of the molten metal is relatively high, the action of the soup must be very careful to avoid the occurrence of work. An accident, at this time, the step of melting the metal material must also be interrupted. After the liquid metal injection molding is completed, the metal material to be heated can be re-introduced and the boiler is further heated, so that the steps are not smooth and time-consuming and laborious. Disadvantages.

In view of the problems of the prior art mentioned above, the present invention provides a metal melting furnace, which is designed to solve the disadvantages of the prior art process of heating the molten metal material which is not smooth, discontinuous and time consuming, when pouring liquid metal. More laborious and prone to dangerous problems.

In order to achieve the above object, the technical means utilized by the present invention is such that a metal melting furnace comprises: a heating furnace having a heating chamber formed therein; and a furnace which is mounted on the heating furnace, the furnace comprising a furnace And a cover plate, the furnace body is placed in a heating chamber of the heating furnace, the cover plate covers the top surface of the furnace body to close the furnace body; a regenerative combustion system comprising a regenerator, at least one pair a burner, at least one pair of heat storage bodies and at least one exhaust pipe, wherein the regenerator is in communication with the heating chamber, the burner is disposed in the regenerator, and the heating chamber of the heating furnace is alternately heated, The regenerators are respectively disposed on the burner, the intake end of one end of the exhaust pipe is in communication with the burner, and the exhaust end of the other end of the exhaust pipe extends to the outside of the regenerator; a feeding device includes a feed pipe, a preheating screw and a feed drum, wherein a feed end of the feed pipe is in communication with the furnace body, and the preheating screw is rotatably axially disposed inside the feed pipe The preheating screw has an exhaust pipe and a spiral blade, and the An intake end of one end of the trachea is in communication with an exhaust end of the exhaust pipe of the regenerative combustion system, and a plurality of exhaust holes are formed through the pipe wall of the exhaust pipe, and the spiral vane ring is disposed outside the exhaust pipe The wall is disposed on the feeding pipe and communicates with the inside of the feeding pipe; a circulating slurry is sent to the soup device, which is mounted on the cover of the furnace and protrudes into the furnace body.

The feeding pipe of the feeding device can transversely penetrate the heating furnace and the furnace body, and the feeding end of the feeding pipe protrudes into the inside of the furnace body.

The feeding tube and the preheating screw of the feeding device may be disposed above the cover of the furnace, and the feeding device may further comprise a feeding barrel and a metering screw: the feeding barrel is erected on the cover of the furnace And extending through the cover plate into the furnace body, the feeding end of the feeding tube of the feeding device corresponds to and communicates with the feeding barrel; the metering screw is rotatably longitudinally penetrated and erected in the feeding barrel The metering screw has a rotatable shaft and a spiral blade disposed around the axial direction of the shaft.

The above-mentioned circulating slurry pumping device can be in the form of a hollow tube body, and a feed end of one end thereof extends into the soup area.

The above-mentioned circulating slurry pumping device can also be a metal liquid transfer pump.

In the furnace body of the furnace, a melting zone, a stirring zone and a feeding zone may be sequentially separated by a heat-resistant partition, and the heat-resistant partition is provided with a plurality of perforations, and the melting zone is connected with the stirring zone, and the stirring zone further Communicating with the soup zone, the melting zone and the soup zone are not directly connected to each other, and the feeding end of the feeding pipe of the feeding device communicates with the melting zone of the furnace body, and the circulating slurry pumping device protrudes from the furnace body The metal melting furnace is further arranged on the cover plate of the furnace corresponding to the stirring zone of the furnace body, and a rotatable stirring rod is arranged, and an inner end of the stirring rod extends into the stirring zone. At least one impeller is disposed at the inner end of the stirring rod.

The cover plate of the above furnace may further be provided with an opening and closing plate which can be selectively opened or closed.

The regenerative combustion system may further include at least one switching valve, wherein the switching valve is provided with an air inlet, an exhaust port, a first air guiding port and a second air guiding port, and the air inlet port is The exhaust port is oppositely disposed, and the exhaust port is in communication with the exhaust pipe, the first air guide port is opposite to the second air guide port, and the first air guide port and the second air guide port are respectively located at the air inlet port and the row Between the two sides of the air port, the first air guiding port and the second air guiding port are respectively connected to the two burners, and the casing of the switching valve is provided with a rotatable switching carousel, the switching carousel is inside the casing Partially separated into two spaces.

The metal melting furnace may further include a partition plate disposed in the heating chamber of the heating furnace and located between the two burners, the two sides of the partition plate respectively abut against the inner wall surface of the heating furnace and The outer wall of the furnace body.

Another technical means utilized by the present invention is to provide a metal melting method which is carried out by using the above metal melting furnace, wherein the exhaust pipe of the regenerative combustion system of the metal melting furnace will heat the high temperature gas in the heating chamber of the heating furnace Introducing into the exhaust pipe of the preheating screw of the regenerator and the feeding device, heating the metal material in a granular or sheet shape in the feeding pipe; the preheating screw pushes the preheated metal material into the furnace of the furnace The body is further heated and melted into a liquid state.

By the design as described above, the metal melting furnace of the present invention recovers the high-temperature gas in the heating furnace by the regenerative combustion system to preheat the granular or sheet metal materials, thereby greatly shortening the metal The time required for the material to subsequently melt to a liquid state. In this way, the metal material is first put into the feeding device for preheating from the front end, and then sent to the furnace for heating and melting, and the liquid metal is injected into the mold at the back end to form the metal product, and the overall process and steps are not only time-saving and smooth, but also It is carried out continuously and with a high degree of safety.

Referring to Fig. 1, the metal melting furnace of the present invention comprises a heating furnace 10, a furnace 20, a regenerative combustion system 30, a feeding device 40, a stirring rod 51 and a circulating slurry feeding device 52.

A heating chamber 11 is formed inside the heating furnace 10.

The furnace 20 is mounted on the heating furnace 10, and the furnace 20 includes a furnace body 21 and a cover plate 22. The furnace body 21 is placed in the heating chamber 11 of the heating furnace 10, and the heating chamber 11 of the heating furnace 10 surrounds the furnace body 21 to heat the furnace body 21. Further, inside the furnace body 21, a melting zone 211, a stirring zone 212 and a feeding zone 213 are sequentially separated by the two heat-resistant partitions 23. The heat-resistant partition 23 is provided with a plurality of perforations 231 to allow the melting zone 211 to communicate with the agitation zone 212. The agitation zone 212 is further in communication with the feed zone 213, but the melt zone 211 and the feed zone 213 are not in direct communication with each other. The cover plate 22 covers the top surface of the furnace body 21 to close the furnace body 21.

The regenerative combustion system 30 includes a regenerator 31, at least one pair of burners 35, at least one pair of regenerators 33, and at least one exhaust pipe 32. The regenerator 31 communicates with the heating chamber 11. The burner 35 is disposed in the regenerator 31 and alternately heats the heating chamber 11 of the heating furnace 10 to increase the temperature of the heating chamber 11 and the furnace 20. The heat accumulators 33 are provided on the burners 35, respectively. When one of the burners 35 heats the heating chamber 11, the high temperature gas in the heating chamber 11 is discharged by the other burner 35, and the heat energy of the high temperature gas is accumulated in the heat storage body provided on the burner 35. 33. This heat accumulator 33 can improve the heating effect of the burner 35.

The intake end of one end of the exhaust pipe 32 is in contact with the burner 35, and is introduced into the high temperature gas around the heat storage body 33. The exhaust end of the other end of the exhaust pipe 32 extends to the outside of the regenerator 31.

The feeding device 40 includes a feeding pipe 41, a preheating screw 42, a driving device 43, and a feeding drum 44. One of the feed ends of the feed pipe 41 is in communication with the melting zone 211 of the furnace body 21. The preheating screw 42 is axially disposed inside the feeding tube 41, and the preheating screw 42 has an exhaust pipe 421 and a spiral blade 423. The intake end of one end of the exhaust pipe 421 communicates with the exhaust end of the exhaust pipe 32 of the regenerative combustion system 30, and the high temperature gas can be further introduced into the exhaust pipe 421. A plurality of exhaust holes 422 are formed in the pipe wall of the exhaust pipe 421. The spiral blade 423 is disposed on the outer wall surface of the exhaust pipe 421 and extends in the axial direction of the exhaust pipe 421. The driving device 43 is connected to the exhaust pipe 421 of the preheating screw 42 to drive the preheating screw 42 to rotate. For better results, the driving device 43 can be a motor, and the feeding drum 44 is mounted on the feeding pipe 41 and communicates with the inside of the feeding pipe 41.

In the first preferred embodiment of the present invention shown in FIG. 1, the feed pipe 41 extends transversely through the heating furnace 10 and the furnace body 21, so that the feed end of the feed pipe 41 directly protrudes to The melting zone 211 of the furnace body 21.

The stirring rod 51 is rotatably mounted on the cover 22 of the furnace 20 at a stirring zone 212 corresponding to the furnace body 21. An inner end of the stirring rod 51 extends into the stirring zone 212, and at least one impeller 511 is disposed at an inner end of the stirring rod 51.

The circulating slurry pumping device 52 is placed on the cover plate 22 of the furnace 20 corresponding to the soup zone 213 of the furnace body 21, and protrudes into the soup zone 213 of the furnace body 21. The circulating slurry pumping device 52 can be used to extract the liquid metal in the furnace body 21, and then inject the liquid metal into a mold (not shown) for casting the metal product. In the first preferred embodiment of the present invention shown in FIG. 1, the circulating pumping feed device 52 has a hollow tubular body shape, and a feed end of one end thereof extends into the feed zone 213, and the other end The discharge end can correspond to a mold for casting metal products.

In the above operation, the metal melting furnace of the present invention is first cut into granular or sheet metal particles into the feeding drum 44 of the feeding device 40, and then the granular or sheet metal materials are used. Further entering the feed tube 41. At this time, as the driving device 43 drives the preheating screw 42 to rotate, the spiral blade 423 on the preheating screw 42 pushes the metal material in the feeding tube 41 to move toward the feeding end. At the same time, the high temperature gas introduced into the exhaust pipe 421 of the preheating screw 42 by the exhaust pipe 32 of the regenerator combustion system 30 enters the feed pipe 41 through the exhaust hole 422 of the exhaust pipe 421. Further, the metal material in the feed pipe 41 is heated. Wherein, the spiral blade 423 of the preheating screw 42 also exerts a stirring effect on the metal material, so that the metal material can be heated sufficiently during the movement process in the feeding tube 41, and gradually changes from a solid state to a semi-solid state, and From the feed end of the feed pipe 41, it enters the melting zone 211 of the furnace body 21.

After the semi-solid metal enters the melting zone 211 of the furnace body 21, it is further melted into a liquid state by the high temperature in the furnace 20.

Then, the liquid metal in the melting zone 211 of the furnace body 21 flows into the agitation zone 212 through the perforations 231 of the heat-resistant partition 23 disposed between the melting zone 211 and the agitation zone 212, and cooperates with the rotating stirring bar. 51 The liquid metal was stirred uniformly.

Thereafter, the evenly mixed liquid metal in the agitation zone 212 is again flowed into the feed zone 213 via the perforations 231 of the heat-resistant partition 23 provided between the agitation zone 212 and the soup zone 213.

As the preheating screw 42 of the feeding device 40 continuously pushes the metal into the melting zone 211 of the furnace body 21, a pressing force is generated on the liquid metal in the furnace body 21, and the furnace body 21 is fed to the soup zone. The liquid metal in the 213 is pumped from the tubular circulation to the feed end of the soup device 52 and flows into the circulation pumping device 52, and the circulating end of the soup device 52 is injected into the mold. Wherein, adjusting the rotation speed of the preheating screw 42 can control the amount of metal entering the furnace body 21, and further control the injection speed and the amount of injection at the discharge end of the circulating pumping device 52.

Referring to the second preferred embodiment of the present invention shown in FIG. 2, the regenerative combustion system 30A further includes at least one switching valve 34A. The switching valve 34A is a four-way valve, and an air inlet 342A, an exhaust port 343A, a first air guiding port 344A and a second air guiding port 345A are arranged on a casing 341A. The intake port 342A is disposed opposite to the exhaust port 343A, and the exhaust port 343A is in communication with the exhaust pipe 32A. The first air guiding port 344A is disposed opposite to the second air guiding port 345A, and the first air guiding port 344A and the second air guiding port 345A are respectively located between the air inlet 342A and the exhaust port 343A. Moreover, the first air guide port 344A and the second air guide port 345A are respectively connected to the two burners 35A. In addition, the housing 341A of the switching valve 34A is provided with a rotatable switching dial 346A. The switching dial 346A divides the interior of the housing 341A into two spaces, so that the first air guiding port 344A and the second air guiding port 345A can be Optionally, the air inlet 342A or the air outlet 343A is in communication.

The metal melting furnace further includes a partition 24A disposed in the heating chamber 11 of the heating furnace 10 and located between the two burners 35A. Further, the two sides of the partition 24A are respectively abutted The inner wall surface of the heating furnace 10 and the outer wall surface of the furnace body 21.

With this design, when the switching dial 346A of the switching valve 34A is rotated to connect the air inlet 342A with the first air guiding port 344A, and the air outlet 343A is in communication with the second air guiding port 345A, The combustion gas introduced from the port 342A flows through the first air port 344A to the burner 35A that is in contact with the first air port 344A, and is heated to a high temperature gas. The high temperature gas is again transported into the heating chamber 11 of the furnace 10 to provide the heat energy required for the furnace body 21. Thereafter, the high temperature gas is discharged from the heating chamber 11 by the other burner 35A, and is sequentially transported into the exhaust pipe 32A via the second air port 345A and the exhaust port 343A of the switching valve 34A.

The above-mentioned partition plate 24A is provided to ensure that the high-temperature gas generated by one of the burners 35A flows through the entire heating chamber 11 and is discharged by the other burner 35A without being directly disposed by another burner 35A provided aside. discharge.

In addition, the feeding tube 41A and the preheating screw 42A of the feeding device 40A are disposed above the cover 22A of the furnace 20, and the feeding device 40A further includes a feeding barrel 45A and a metering screw 46A. The feed tank 45A is placed on the cover 22A of the furnace 20 at a melting zone 211 corresponding to the furnace body 21, and protrudes through the cover plate 22A into the melting zone 211 of the furnace body 21. The feed end of the feed pipe 41A of the feeding device 40A corresponds to and communicates with the feed drum 45A. The preheating screw 42A can push the preheated semi-solid metal in the feed pipe 41A into the feed drum 45A.

The metering screw 46A is rotatably longitudinally inserted and mounted in the feed drum 45A. The metering screw 46A has a rotatable shaft 461A and a spiral blade 462A disposed around the axial direction of the shaft 461A. The shaft 461A can be rotated by a driving device 463A. As the metering screw 46A rotates, the spiral blade 462A of the metering screw 46A further pushes the metal in the feeding barrel 45A into the melting zone of the furnace body 21. 211. Wherein, since the feeding drum 45A communicates with the melting zone 211 of the furnace body 21, the high temperature in the melting zone 211 of the furnace body 21 is also transmitted to the feeding drum 45A, and the metal in the feeding drum 45A is heated. By adjusting the rotational speed of the metering screw 46A, the amount of metal entering the furnace body 21 can be controlled.

The circulating slurry pumping device 52A is a metal liquid transfer pump which can directly extract the liquid metal in the soup zone 213 of the furnace body 21 to inject the liquid metal into the mold.

Further, referring to FIG. 3, an opening and closing plate 221A may be disposed on the cover 22A of the furnace 20. When the metal melting furnace is in operation, the opening and closing plate 221A is closed to close the furnace body 21. After the metal melting furnace is stopped, the worker can open the opening and closing plate 221A to enter the furnace body 21 to remove the slag.

The metal melting furnace of the present invention recovers the high temperature gas in the heating furnace 10 by using the regenerative combustion system 30, and introduces the high temperature gas into the preheating screw 42, 42A to the sheet or granular metal. The way the material is preheated can significantly reduce the time required for subsequent melting to a liquid state. In this way, the metal material is preheated from the front end into the feeding device 40, 40A, and then sent to the furnace 20 for heating and melting, and the liquid metal is injected into the mold at the back end to form the metal product, and the overall process and steps are not only time-saving, It is smooth and can be carried out continuously, and it can be used in a high degree of safety because it does not need to inject liquid metal into the mold.

10. . . Heating furnace

11. . . Heating chamber

20. . . furnace

twenty one. . . Furnace body

211. . . Melting zone

212. . . Stirring zone

213. . . Soup area

22, 22A. . . Cover

221A. . . Opening and closing board

twenty three. . . Heat-resistant partition

231. . . perforation

34A. . . Partition

30. . . Regenerative combustion system

31. . . Regenerator

32, 32A. . . exhaust pipe

33. . . Heat accumulator

34A. . . Switching valve

341A. . . case

342A. . . Air inlet

343A. . . exhaust vent

344A. . . First air inlet

345A. . . Second air inlet

346A. . . Switch carousel

35, 35A. . . burner

40, 40A. . . Feeding device

41, 41A. . . Feed tube

42, 42A. . . Preheating screw

421. . . exhaust pipe

422. . . Vent

423. . . Spiral blade

43. . . Drive unit

44. . . Feeding bucket

45A. . . Feeding bucket

46A. . . Metering screw

461A. . . Shaft

462A. . . Spiral blade

463A. . . Drive unit

51. . . Stir bar

511. . . impeller

52, 52A. . . Circulating slurry pumping device

1 is a side elevational view of a first preferred embodiment of the present invention.

2 is a side elevational view of a second preferred embodiment of the present invention.

3 is a top plan view of a second preferred embodiment of the present invention.

10. . . Heating furnace

11. . . Heating chamber

20. . . furnace

twenty one. . . Furnace body

211. . . Melting zone

212. . . Stirring zone

213. . . Soup area

twenty two. . . Cover

twenty three. . . Heat-resistant partition

231. . . perforation

30. . . Regenerative combustion system

31. . . Regenerator

32. . . exhaust pipe

33. . . Heat accumulator

35. . . burner

40. . . Feeding device

41. . . Feed tube

42. . . Preheating screw

421. . . exhaust pipe

422. . . Vent

423. . . Spiral blade

43. . . Drive unit

44. . . Feeding bucket

51. . . Stir bar

511. . . impeller

52. . . Circulating slurry pumping device

Claims (10)

A metal melting furnace comprising a heating furnace, a melting furnace, a regenerative combustion system, a feeding device and a circulating slurry feeding device, wherein: a heating chamber is formed inside the heating furnace; the furnace is arranged on the heating furnace The furnace comprises a furnace body and a cover plate, the furnace body is placed in a heating chamber of the heating furnace, the cover plate covers the top surface of the furnace body to close the furnace body; the regenerative combustion system comprises a regenerator, at least a pair of burners, at least one pair of regenerators and at least one exhaust pipe, wherein the regenerator is in communication with the heating chamber, the burner is disposed in the regenerator, and the heating chamber of the furnace is alternately heated The regenerator is respectively disposed on the burner, the intake end of one end of the exhaust pipe is connected to the burner, and the exhaust end of the other end of the exhaust pipe extends to the outside of the regenerator; the feeding device comprises a a feeding tube, a preheating screw and a feeding barrel, wherein a feeding end of the feeding tube is in communication with the furnace body, and the preheating screw is rotatably axially disposed inside the feeding tube The preheating screw has an exhaust pipe and a spiral blade. An intake end of one end of the exhaust pipe is in communication with an exhaust end of the exhaust pipe of the regenerative combustion system, and a plurality of exhaust holes are formed through the pipe wall of the exhaust pipe, and the spiral blade is disposed on the exhaust pipe The outer wall is mounted on the feeding pipe and communicates with the inside of the feeding pipe; the circulating slurry is placed on the cover of the furnace and protrudes into the furnace body. The metal melting furnace according to claim 1, wherein the feeding pipe of the feeding device transversely penetrates the heating furnace and the furnace body, and the feeding end of the feeding pipe protrudes into the furnace body. The metal melting furnace according to claim 1, wherein the feeding tube and the preheating screw of the feeding device are erected above the cover of the furnace, and the feeding device further comprises a feeding barrel and a metering screw. The feeding bucket is erected on the cover of the furnace and protrudes into the furnace body through the cover plate, and the feeding end of the feeding pipe of the feeding device corresponds to and communicates with the feeding barrel; the metering screw system Rotatablely longitudinally extending and erected in the feed barrel, the metering screw has a rotatable shaft and spiral blades disposed around the axial direction of the shaft. The metal melting furnace according to any one of claims 1 to 3, wherein the circulating pumping device is in the form of a hollow tube body, and a feed end of one end thereof extends into the soup area. The metal melting furnace according to any one of claims 1 to 3, wherein the circulating pumping feed device is a metal liquid transfer pump. The metal melting furnace according to any one of claims 1 to 3, wherein: in the furnace body of the furnace, a melting zone, a stirring zone and a feeding zone are sequentially separated by two heat-resistant partitions. The partition plate is provided with a plurality of perforations, the melting zone is in communication with the agitation zone, and the agitation zone is further connected to the soup zone, the melt zone is not directly connected to the soup zone, and the feed pipe of the feeding device is fed. The end is connected to the melting zone of the furnace body, and the circulating slurry pumping device protrudes into the soup zone of the furnace body; the metal melting furnace further erects a rotatable position on the cover plate of the furnace corresponding to the furnace body a stirring rod, an inner end of the stirring rod is inserted into the stirring zone, and at least one impeller is arranged at the inner end of the stirring rod. The metal melting furnace of claim 6, wherein the cover of the furnace is further provided with an opening and closing plate that can be selectively opened or closed. The metal melting furnace of claim 7, wherein the regenerative combustion system further comprises at least one switching valve, wherein the switching valve is connected to a casing with an air inlet, an exhaust port, and a first a gas guiding port and a second air guiding port, the air inlet opening and the exhaust port are opposite to each other, and the exhaust port is in communication with the exhaust pipe, the first air guiding port is opposite to the second air guiding port, and the first guiding The air port and the second air guiding port are respectively located between the two sides of the air inlet and the air outlet, and the first air guiding port and the second air guiding port are respectively connected to the two burners, and the housing of the switching valve is provided There is a rotatable switching dial that divides the interior of the housing into two spaces. The metal melting furnace of claim 8, further comprising a partition disposed in the heating chamber of the heating furnace and located between the two burners, both sides of the partition Abut against the inner wall surface of the heating furnace and the outer wall surface of the furnace body. A metal melting method, which is carried out by using a metal melting furnace according to any one of claims 1 to 9, wherein the exhaust pipe of the regenerative combustion system of the metal melting furnace is to be heated in the heating furnace The high temperature gas is introduced into the regenerator of the regenerator and the preheating screw of the feeding device to heat the metal material in the feeding tube; the preheating screw pushes the preheated metal material into the furnace body to further heat Melted into a liquid state.