JPH08278082A - Rotary melting furnace - Google Patents

Abstract

PURPOSE: To prevent the exhaust of smoke from a furnace body and to reduce the loss of the thermal energy. CONSTITUTION: The rotary melting furnace comprises a cover holder 7 arranged on the moving locus of an exhaust port 14 in the case of moving a furnace body 1, and a cover member 8 detachably held by the holder 7, engaged with the flange 15 of the body 1 to cover the port 14 in the case of shifting the body 1 from a horizontal attitude to an upright attitude and engaged to be returned to the holder 7 when the body 1 is reset from the upright attitude to the horizontal attitude.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary melting furnace mainly used for melting cast iron.

[0002]

2. Description of the Related Art Conventionally, a burner type rotary furnace shown in FIG. 6 has been known as a rotary melting furnace used for melting cast iron.
This burner type rotary furnace is open at both ends and has an exhaust port 14 at one end.
The furnace body 1a having a substantially cylindrical shape having a is provided. The furnace body 1a is supported so as to be rotatable about a cylinder axis and tiltable about a horizontal pivot 31a orthogonal to the cylinder axis.

A burner 5 is provided on the front side of the furnace body 1a.
1a and a lid 5a that opens and closes one opening 13a by a driving means. The exhaust port 1 is provided on the rear side of the furnace body 1a.
An exhaust duct 6a is arranged to face 4a. Further, a chute 65a for charging raw materials is arranged at an obliquely upper position of the furnace body 1a, and a dolly 4 for mounting a ladle for lapping and a ladle receiver is provided in a rectangular groove 4a provided below the furnace body 1a.
1a is provided.

In order to operate the burner type rotary furnace, the raw materials are charged into the furnace body 1a through the exhaust port 14a on the rear end side while the furnace body 1a is tilted, and the furnace body 1a is horizontally oriented. After that, the lid 5a is swung to the closed position of the opening 13a of the furnace body 1a, and the flame is emitted from the burner 51a while rotating the furnace body 1a to heat and melt the raw materials in the furnace body 1a. .

When the melting of the raw materials is completed, the tap hole 17a formed on the front end side of the furnace body 1a is opened and tapped. After that, the lid 5a is swung from the closed position to the retracted position, and the furnace body 1a is further tilted to be in the upright posture, whereby the slag is discharged from the opening 13a. After the slag is discharged, the furnace body 1a is tilted again to shift to the raw material charging in the next cycle, or the furnace body 1a is returned to the horizontal posture and the operation is finished.

[0006]

By the way, during the operation of the burner type rotary furnace, in order to prevent the slag from remaining as much as possible when discharging the slag with the furnace body 1a standing upright after tapping. The furnace body 1a is left standing in an upright posture for a while, or the furnace body 1a is repeatedly rotated and stopped, which makes the time relatively long. Therefore, the furnace body 1
A large amount of soot is discharged from the exhaust port 14a of a. Since the soot contains ZnO and Zn fume which are harmful to the human body, there is a problem that the environment of the workplace is deteriorated.

Further, when the furnace body 1a is in the upright posture, the heat of the furnace body 1a heated to an extremely high temperature is released from the exhaust port 14a due to the chimney effect, and in the case of continuous operation, a large amount of heat energy is generated. There is also the problem of causing losses. The present invention has been devised in view of the above problems, and it is an object to be solved to prevent discharge of soot from the furnace body and reduce heat energy loss.

[0008]

A rotary melting furnace according to the present invention which solves the above-mentioned problems is provided with a lid holder disposed on a movement locus of an exhaust port when the furnace body is tilted, and the lid holder. It is detachably held, and is engaged with the exhaust port when the furnace body shifts from the horizontal posture to the upright posture, and the lid holder when the furnace body returns from the upright posture to the horizontal posture. A new structure is employed in which the lid member is engaged with and returned to.

In a preferred aspect of the present invention, the lid member includes a main body portion that covers the exhaust port, a first engaging portion that is suspended by the lid holder, and a first anchor portion that is anchored to the exhaust port. It is composed of two engaging parts.

[0010]

In the rotary melting furnace of the present invention, when the furnace body shifts from the horizontal posture to the upright posture, the lid member held by the lid holder arranged on the movement path of the exhaust port of the furnace body is in the upright posture. It engages with the exhaust port which moves to and separates from the lid holder, and is capped by the exhaust port. As a result, when the furnace body is in the upright posture, the exhaust port is covered by the lid member. Therefore, when exhausting slag with the furnace body in an upright position, soot and heat are prevented from being emitted from the exhaust port.

On the contrary, when the furnace body returns from the upright posture to the horizontal posture, the lid member that covers the exhaust port of the furnace body engages with the lid holder, and is separated from the furnace body that shifts to the horizontal posture. Then, it is returned in a state of being suspended in the lid holder. This allows
The exhaust port of the furnace body is opened when passing through the lid holder.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a burner type rotary furnace according to this embodiment, and FIG. 2 is a front view thereof. 1 and 2,
Reference numeral 1 denotes a furnace body having a cylindrical shape with openings at both ends. The furnace body 1 is a substantially cylindrical base cylinder 11 made of a stainless steel thick plate.
And a refractory brick layer (not shown) lined thickly on the inner surface of the base cylinder 11. A circular opening 13 into which a lid 5 to be described later can be fitted is formed in the center of the front end wall of the furnace body 1, and an exhaust port 14 is formed in the center of the rear end wall of the furnace body 1. . A lid member 8 described later is provided around the exhaust port 14.
Is formed with a flange portion 15.

Further, a pair of tapping pipe portions 16 are provided at an axisymmetric position of the front end wall portion of the furnace body 1 so as to project slightly obliquely with respect to the axis, and tapping holes for communicating with the inside of the furnace are formed in the tapping pipe portion 16. 17 are formed. The tap hole 17 is closed by a clay-like sealing material before the raw materials are put into the furnace. Also, the base cylinder 11
A pair of circular brim portions 18 wound around in the circumferential direction at a constant distance from each other are provided in the outer peripheral central portion.

The furnace body 1 is rotatably mounted on a tilting table 2 having a U-shaped cross section perpendicular to the cylindrical axis. Tilting table 2
Is a frame body composed of a bottom plate portion 21 and wall portions 22 standing upright from the left and right ends of the bottom plate portion 21. The bottom plate portion 21 has a total of four front, rear, left, and right rollers (in FIG. 23) is rotatably supported by each roller 2
3 rotatably supports the outer peripheral surface of the furnace body 1.

Further, the bottom plate portion 21 of the tilting base 2 is provided with a motor 2 for driving a left pair of these four rollers 23.
4 is arranged and the torque of the motor 24 is
Is transmitted to the outer peripheral surface of the furnace body 1 to rotate the furnace body 1. Further, a total of four front, rear, left and right support rollers 25 are rotatably supported at the front and rear ends of the wall portion 22, and each support roller 25 is attached to the circular flange portion 18 of the furnace body 1 when the furnace body 1 is tilted. It abuts rotatably to prevent the furnace body 1 from falling off.

The tilting base 2 is pivotally supported by a pair of bases 3 so as to be tiltable. The bases 3 are erected on the floor with a rectangular groove 4 recessed in the floor below the furnace body 1 therebetween, and the tilting bases 2 are pivotally supported on the tops of the bases 3 so as to be tiltable. Tilt axis 3
1 extends in a direction orthogonal to the cylindrical axis of the furnace body 1. The base end of the hydraulic cylinder 32 is pivotally supported in the rear portion of the rectangular groove 4 so as to be tiltable in the front-back direction, and the tip of the piston rod 33 of the hydraulic cylinder 32 is tiltable in the front-back direction on the bottom of the tilting base 2. Is pivoted to. Therefore,
When the piston rod 33 extends, the tilting base 2 and the furnace body 1
Tilts around the tilting shaft 31. Even if the furnace body 1 is tilted to an oblique posture, the furnace body 1 can be rotated in an oblique posture by being supported by the support roller 25 through the circular brim portion 18. Further, on the bottom surface of the rectangular groove 4, a trolley 41 for mounting a ladle of molten metal and a ladle receiver is arranged.

Reference numeral 5 denotes a lid that opens and closes the opening 13 of the furnace body 1, and is fixed to the tip of an arm 57 that extends horizontally from the upper part of a revolving shaft 56 erected on the base 55. The lid 5 is formed in a thick disk shape that can be fitted into the opening 13, and a burner 51 having a plurality of nozzles projecting from the inner disk surface and radiating flames is attached to the central portion thereof. Fuel gas and oxygen gas are supplied to the burners 51 through flow control valves (not shown).

On the other hand, on the rear side of the furnace body 1, an exhaust duct 6 is arranged so that the exhaust port 14 and the suction port of the furnace body 1 face each other. A chute 65 for charging raw materials is arranged on the movement trajectory of the exhaust port 14 when the 1 tilts. At a position on the movement locus of the exhaust port 14 of the furnace body 1 and adjacent to the upper side of the chute 65, a lid holder 7 formed in a substantially L-shape for detachably holding the lid member 8 is provided. It is arranged. This lid holder 7
Includes a support rod 71 whose upper end is fixed to the mounting portion, and a support rod 7
1 and a holding portion 72 extending in a substantially horizontal direction from the lower end of the holding body 1, and the tip of the holding portion 72 is arranged in a direction in which the furnace body 1 shifts from a horizontal posture to an upright posture.

The lid member 8 held by the lid holder 7 is shown in FIG.
Further, as shown in FIG. 4, a disk-shaped main body portion 81 that covers and closes the exhaust port 14 of the furnace body 1 is provided. On the upper surface side of the main body portion 81, its arcuate peripheral edge portion is fixed to the peripheral edge of the main body portion 81,
A substantially semicircular first engaging portion 82 having a cavity into which the holding portion 72 of the lid holder 7 is fitted is provided therein. Further, a semicircular arc-shaped second engaging portion 83 to which the flange portion 15 of the furnace body 1 is anchored is provided on the lower surface side peripheral portion of the main body portion 81 corresponding to the first engaging portion 82.

The hydraulic cylinder 32 and the like are drive-controlled based on operation signals from various operation switches on the control panel 9. Further, the control panel 9 has a built-in microcomputer, and drives and controls various actuators of the burner type rotary furnace such as the above-mentioned flow rate control valve for adjusting the ejection amounts of the fuel gas and the oxygen gas. The operation by the burner type rotary furnace configured as described above is performed as follows.

At the start of operation, the lid 5 is separated from the opening 13 of the furnace body 1 and is retracted to the retracted position, and instead, a shield plate (not shown) for closing the opening 13 is attached. Next, the hydraulic cylinder 32 is turned on by turning on the operation switch.
Is operated to tilt the tilting table 2 and the furnace body 1 from the horizontal posture to the diagonal posture, and the raw materials are introduced from the exhaust port 14 of the furnace body 1 through the chute 65. Next, the hydraulic cylinder 32 is operated by turning on the operation switch to move the tilting table 3 and the furnace body 1.
Return to horizontal position and remove the shield.

The lid 5 is turned on by turning on the operation switch.
The fuel and oxygen gas ejected from the burner 51 are manually ignited, and the lid 5 is swung to be fitted into the opening 13 of the furnace body 1, and the burner 51 attached to the lid 5 extends along the cylindrical axial direction. To arrange. In this state, combustion is performed while controlling the flow rates of the fuel gas and the oxygen gas, and the furnace body 1 is appropriately rotated to heat and melt the raw materials.

After raising the temperature of the molten metal to a sufficient temperature, the rotation of the furnace body 1 is stopped, and the tap hole 1 located at the lower side is
The clay-like sealing material packed in 7 is removed by poking, and tap water is discharged to the ladle on the dolly 41. When the ladle is full, the furnace body 1 is rotated 90 ° to raise the tap hole 17 above the molten metal surface, and the ladle is replaced with an empty one during that time. After the tapping is finished, the lid 5 is swung from the closed position of the opening 13 of the furnace 1 to the retracted position in order to discharge slag inside the furnace 1, and then the hydraulic cylinder 32 is operated to operate the furnace 1. The tilting table 2 and the furnace body 1 are tilted so as to change from the horizontal position to the upright position. At this time, as shown in FIG. 5, the exhaust port 14 of the furnace body 1
The second engaging portion 83 of the lid member 8 held by the lid holder 7 on the movement locus of the above is engaged with the flange portion 15 of the furnace body 1 that shifts to the upright posture, and the lid member 8 causes the lid holder 8 to move. 7 and the exhaust port 14 is capped.

As a result, when the furnace body 1 is in the upright posture, the exhaust port 14 of the furnace body 1 is covered by the body portion 81 of the lid member 8 to prevent the emission of soot and heat from the exhaust port 14. It In this state, the slag inside the furnace body 1 is discharged from the opening 13 to the slag receiver on the carriage 41. After the end of the slag discharge, the hydraulic cylinder 32 is operated again to shift the furnace body 1 to the oblique posture for the purpose of feeding the raw material for the next cycle, or to return the furnace body 1 to the horizontal posture and finish the operation. At this time, when the furnace body 1 shifts from the upright posture to the diagonal posture, the lid member 8 that has closed the exhaust port 14 has the first engaging portion 82 held by the holding portion 72 when passing through the lid holder 7. And is released from the exhaust port 14 and is returned in a state of being suspended by the lid holder 7. As a result, when the furnace body 1 returns to the oblique posture or the horizontal posture, the exhaust port 14 is opened.

As described above, according to the burner type rotary furnace of this embodiment, when the furnace body 1 shifts from the horizontal posture to the upright posture, it is moored to the flange portion 15 of the furnace body 1 to cover the exhaust port 14. Since the lid member 8 is closed, the exhaust port 14 can be automatically and reliably covered by the lid member 8 when the furnace body 1 is in the upright posture. Therefore, when discharging
It is possible to prevent soot and smoke containing harmful substances from being discharged from the exhaust port 14 of the furnace body 1, and prevent the heat of the furnace body 1a from being released from the exhaust port 14a, resulting in a large loss of heat energy. It is possible to reduce the amount and improve the operation efficiency.

Further, since the lid member 8 is automatically engaged and returned to the lid holder 7 when the furnace body 1 returns from the upright posture to the horizontal posture, an operation for attaching and detaching the lid member 8 and No work required. Therefore, the operation will not be prolonged or complicated.

[0027]

According to the rotary melting furnace of the present invention, the lid holder disposed on the moving path of the exhaust port when the furnace body tilts, and the lid holder detachably held by the furnace, When the body transitions from the horizontal posture to the upright posture, it is capped and engaged with the exhaust port,
Since the furnace body is provided with a lid member that is engaged and returned to the lid holder when the furnace body returns from the upright position to the horizontal position, when the furnace body is in the upright position, the lid member automatically opens the exhaust port. It can be surely closed. Therefore, it is possible to prevent the soot and smoke from being discharged from the furnace body at the time of discharging the slag, and it is possible to significantly reduce the loss of heat energy.

[Brief description of drawings]

FIG. 1 is a side view of a burner type rotary furnace according to an embodiment of the present invention.

FIG. 2 is a front view of a burner type rotary furnace according to an embodiment of the present invention.

FIG. 3 is a top view of the lid member according to the embodiment of the present invention.

FIG. 4 is a bottom view of the lid member according to the embodiment of the present invention.

FIG. 5 is an explanatory view showing a state in which the furnace body shifts to the upright posture in the embodiment of the present invention.

FIG. 6 is a side view of a conventional burner type rotary furnace.

[Explanation of symbols]

1 ... Furnace body 2 ... Tilt table 3 ... Base 4 ... Square groove
5 ... Lid 6 ... Exhaust Duct 7 ... Lid Holder 8 ... Lid Member 9
Control panel 14 Exhaust port 71 Support rod 72 Holding section 8
DESCRIPTION OF SYMBOLS 1 ... Main body part 82 ... 1st engaging part 83 ... 2nd engaging part

 ─────────────────────────────────────────────────── ─── Continuation of front page (71) Applicant 591181089 Naniwa Reactor Research Institute Co., Ltd. 5-1, Ageo-cho, Yao-shi, Osaka 8 (72) Inventor Harumi Hirano 2-1-1, Toyota-cho, Kariya, Aichi Stock company Toyota Automatic Loom Works (72) Inventor Hidetoshi Hirai 2-chome Toyota Town, Kariya City, Aichi Prefecture Stock Company Toyoda Automatic Loom Works (72) Inventor Yuji Kamiya 2-chome Toyota Town, Kariya City, Aichi Prefecture Incorporated company Toyota Industries Corp. (72) Inventor Hiroshi Kobayashi 2-chome Toyota Town, Kariya City, Aichi Prefecture Incorporated company Toyota Industries Corp. (72) Inventor Yuji Okada 1 Toyota Town, Aichi Prefecture Toyota Auto Car Co., Ltd. (72) Inventor Hirokazu Shirakawa 1 Toyota Town, Toyota City, Aichi Toyota Motor Co., Ltd. (72) Inventor Tsuruoka Hiroyuki 1-9-1 Shinonome, Koto-ku, Tokyo Taisan Co., Ltd. Head Office (72) Inventor Makoto Torii 1-9-1 Shinonome, Koto-ku, Tokyo Taisan Co., Ltd. Head Office (72) Inventor Tanaka Hiroyuki Taisan Co., Ltd. 1-9-1 Shinonome, Koto-ku, Tokyo (72) Inventor Hirotoshi Murata Eight-share company Naniwa Reactor Research Institute at 5-chome Ageo-cho, Yao-shi, Osaka

Claims (2)

[Claims] 1. A burner type rotation having a furnace body which is formed in a cylindrical shape having an exhaust port at one end and is supported so as to be rotatable about a cylinder axis and tiltable about a horizontal axis orthogonal to the cylinder axis. In the furnace, a lid holder disposed on the movement trajectory of the exhaust port when the furnace body tilts, and detachably held by the lid holder,
When the furnace body shifts from the horizontal position to the upright position, the exhaust port is engaged and capped, and when the furnace body returns from the upright position to the horizontal position, it is returned to the lid holder. A rotary melting furnace comprising: a lid member. 2. The lid member includes a main body portion that covers the exhaust port, a first engaging portion that is suspended by the lid holder, and a second engaging portion that is anchored to the exhaust port. The rotary melting furnace according to claim 1, which is configured.