JPH09273865A - Rotary type refining apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transfer molten metal as it is to a casting process without shifting the molten metal after refining to a molten metal receiving ladle by a method wherein a small-sized refining furnace body is so designed as to be simply removed from a turnable and tiltable drive mechanism. SOLUTION: A rotary type refining apparatus has a container 3 for molten metal, connectively provided to tiltable trunnion shafts 1 in such a manner as to be turnable around the axial line of the trunnion shafts 1, and a rotary ring 2 connectively provided to each trunnion shaft 1 in such a manner as to be turnable, including its axial line in a plane normal to the tilting direction of each trunnion shaft 1. In this apparatus, the container 3 whose top end is formed into a cone shape has an opening at its central part and is connectively provided to the rotary rings 2 so as to be insertable thereinto from above the rotary rings 2 and withdrawable therefrom, and deviation-preventing means for regulating the deviation of the container are provided to the rotary rings 2. Thus, it is so designed that only the container can be taken out to be transferred without disassembling the trunnion shafts 1 and the rotary rings 2 and that the molten metal after refining can be directly poured into a mold without shifting it to another ladle, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refining apparatus used for refining molten metal, and more particularly to a rotary refining apparatus in which a furnace body is used as a lightweight pot and the pot can be conveyed to a foundry after refining. .

[0002]

2. Description of the Related Art A rotary furnace used for refining cast iron or the like is generally equipped with a mechanism for rotating the furnace axis and tilting the furnace axis. Then, by tilting the furnace shaft, the molten metal is charged from a charging pot hung on a crane in a posture in which the rotary furnace is erected, and after refining, the molten metal is discharged to the receiving pot by tilting it toward the receiving pot. Then, the pot is transported to the foundry for casting.

Further, in refining, oxygen is blown into the molten metal by inserting an oxygen lance into the molten metal with the furnace shaft of the rotary furnace slightly inclined. At this time, since a large amount of high-temperature gas is released from the molten metal surface, a facility for exhausting the gas by facing an exhaust gas duct at the inlet of the rotary furnace is required.

Further, since the rotary furnace has a mechanism in which the rotation and tilting operations around the furnace axis are performed by the trunnion shaft, the rotary furnace itself cannot be removed from the equipment. For this reason, as described above, it is necessary to prepare a transfer hot pot and transfer molten metal from the rotary furnace to the hot pot every time refining is completed.

[0005]

On the other hand, when a small-scale factory mainly manufactures cast products, many product items are handled, but most of them are small-scale production. For this reason, the rotary furnace itself does not have to be large in size under the present circumstances, and if the exhaust gas duct is included, the equipment becomes large, which is not suitable for a small factory.

Further, after the refining, the molten metal is transferred from the rotary furnace to the hot water pan and transferred to the casting structure, so time is required for this transfer operation, and the effect on productivity cannot be ignored. Then, not only the heat loss due to the transfer to the hot water pan increases, but also the amount of the molten metal deposited on the inner surface of the hot water pan during the transfer process increases, which inevitably reduces the yield.

As described above, in the conventional rotary refining furnace, the furnace body cannot be removed from the rotating and tilting mechanism, so that the workability and the yield are poor in terms of handling the molten metal after refining, and the scale is small. There is a problem that the plant cannot be properly equipped.

The problem to be solved in the present invention is to provide a compact refining furnace body which can be easily removed from its rotation and tilting drive mechanism so that the molten metal after refining is directly transferred to the receiving pot without being transferred. The object is to provide a rotary refining device that can be transferred to.

[0009]

According to the present invention, a container for molten metal is connected to a tiltable trunnion shaft so as to be rotatable about its axis, and the axis is formed in a plane orthogonal to the tilting direction of the trunnion shaft. In a rotary refining apparatus including a rotating ring connected to a trunnion shaft so as to be rotatable and contained, the container has a cone-shaped upper end and an opening at the end, and can be inserted into and removed from the rotating ring from above. It is characterized in that the rotating ring is provided with means for preventing the displacement in the axial direction of the container, which is connected to the container and holds the container in the rotating ring, and in a direction orthogonal to the axial direction.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION By connecting a container for molten metal to a rotating ring so that the container can be inserted and removed, it is possible to take out only the container without disassembling the rotating ring and the trunnion shaft. Therefore, when the refining of the molten metal in the container is completed, the container can be transported to the casting factory by a crane etc. and the molten metal can be directly injected into the mold, and the molten metal after refining is transferred from the refining furnace to a pot etc. It becomes unnecessary to replace and transport.

Further, if the container is a conventionally known pot for molten metal and is covered with a cone-shaped lid with an opening butt, it becomes easy to inject it into the mold after it has been conveyed by a crane, and If it is small and lightweight, it can be optimally used for casting mainly for small volume production.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially cutaway front view showing an essential part of a rotary refining furnace of the present invention, and FIG. 2 is a plan view thereof. In FIG. 1, the left half thereof is taken along the line AB of FIG. In the right half including the cross section, a portion including the cross section of the CD line and the E-F line is a cut cross section.

In the figure, a rotating ring 2 is attached to a trunnion shaft 1 which can be tilted by a conventionally known driving mechanism so as to be connected to the driving mechanism so as to be rotatable around its axis, and a molten metal for refining the rotating ring 2 is provided. The container 3 into which is charged is detachably incorporated.

FIG. 3 is a cutaway front view of the container 3. The main body 3a has the size of a pot for a molten metal container used in a general foundry and the like, and an opening 3c connected to the upper end of the main body 3c. It is composed of an opened cone-shaped lid 3b. Suspension fittings 3d for hanging on the hook of a crane are provided at the upper end of the main body 3a so as to face each other at two positions in the radial direction, and an upper ring 3e and a lower metal fitting 3f are respectively arranged on the peripheral surface of the main body 3a at an angle pitch of 90 degrees. It has 4 each.

Referring back to FIGS. 1 and 2, the trunnion shaft 1 is rotated by a tilting motor 5 about a rotation axis A shown in FIG. 1 to tilt the container 3 and is of a conventional rotary type. It has the same mechanism as that generally used in refining furnaces. Then, the rotation main shaft 4 is incorporated coaxially with the rotation axis of the trunnion shaft 1, the rotation main shaft 4 is connected to the rotation drive motor 6 provided outside the trunnion shaft 1, and the pinion 4a is attached to one end facing the rotation ring 2. ing.

On the outer peripheral surface of the rotating ring 2, flanges 2a and 2b are formed at the upper and lower two positions around the entire circumference, and the trunnion shaft 1 is provided with rotation guide rolls 1a and 1b for receiving the peripheral surfaces of these flanges 2a and 2b. Set up. Also, as shown in FIG.
Axial guide rolls 1c and 1d having rolling surfaces on the upper and lower surfaces of the flanges 2a and 2b, respectively, are provided. A rack 2c that meshes with the pinion 4a is provided on the outer peripheral surface of the rotary ring 2 (see FIG. 2), and the rotary ring 2 is rotationally driven around its axis by rotationally driving the pinion 4a.

In order to make the container 3 attachable / detachable to / from the rotating ring 2, a holding seat 2d with an advancing / retreating device into which a lower metal 3f can be inserted is provided at the lower end of the rotating ring 2, and an upper ring is provided at the upper end. A seat 2e for receiving 3e is provided. As shown in FIG. 4 (a view taken along the line AA in FIG. 1), the holding seat 2d has a bifurcated planar shape with an interval into which the lower metal fitting 3f can be inserted, and for example, by a screw type jack in the drawing. It can move back and forth in the left-right direction. Further, the receiving seat 2e is such that the upper ring 3e can be guided and placed on a flat receiving surface, and the guide portion and the upper ring 3a can be received.
It is important that the gap is small in order to prevent the displacement between the container 3 and the rotating ring 2 during rotation. The guide portion has the effect of preventing lateral displacement of the received upper ring 3e. The rotation block 2 of the lock is attached to the upper surface of the seat 2e.
When f is rotatably held by the studs 2h and the nuts 2g and the posture shown in FIG.
It can be restrained by pressing the upper surface of.

It is needless to say that the holding seat 2d and the receiving seat 2e are formed in conformity with the positions of the upper ring 3e and the lower metal piece 3f of the container 3, and they are provided at four or more positions on the inner circumference of the rotary ring 2, respectively. I shall.

In the above structure, since the rotating ring 2 is held by the rotating guide rolls 1a and 1b and the axial guide rings 1c and 1d with respect to the trunnion shaft 1,
The rotating ring 2 tilts integrally with the trunnion shaft 1, and the rotational main shaft 4 is rotationally driven, whereby the rotating ring 2 is rotationally driven around its axis by the meshing of the pinion 4a and the rack 2c.

With respect to the rotating ring 2 connected to the trunnion shaft 1 in this way, the container 3 has its lower metal piece 3f inserted into the holding seat 2d, and at the same time has the upper ring 3e as a guide portion. The upper ring 3e is only restrained by being dropped into the seat 2e and being rotated by the rotating block 2f. Since the rotation block 2f engages with the upper surface of the upper ring 3e, the container 3 is restrained from moving in the axial direction with respect to the rotation ring 2, and the upper and lower protrusions 3e and 3f respectively receive the seat 2e and the holding portion. Zodiac 2
The movement of the container 3 in the circumferential direction is restricted by f, and the container 3 can tilt and rotate together with the rotating ring 2.

As shown in FIG. 1, the rotating ring 2 is set so that the container 3 is in a vertical posture, the rotating block 2f is rotated to open the upper surface of the upper ring 3e, and the holding seat 2d is retracted to lower the metal fitting 3f. Open the upper ring 3e
Both the lower metal piece 3f and the lower metal piece 3f are freely movable upward. Therefore, if the rotation block 2f is disengaged from the upper ring 3e at the time when the refining of the molten metal in the container 3 by blowing oxygen is completed, the hook 3c of the crane is hooked on the hanging metal fitting 3d to pull it up. Can be pulled out from.

In this way, the container 3 can be taken out and transported by a crane to the casting factory to directly inject the molten metal into the mold. As in the conventional case, the molten metal is transferred to a dedicated pot for transportation or the like. No replacement work is required. Therefore, adhesion of molten metal to the pan due to heat loss generated when transferring to the pan is suppressed, and the yield is improved. Then, when the injection of the molten metal is completed, the molten metal is conveyed again by the crane, and the container 3 is dropped into the rotating ring 2 to lower the metal 3f.
The container 3 can be set for refining by inserting into the holding seat 2d and simultaneously inserting the upper ring 3e into the receiving seat 2e provided with the guide portion.

Further, since the container 3 can be attached / detached to / from the rotating ring 2 by a simple operation without disassembling the trunnion shaft 1, at least two containers are required for repairing or replacing the refractory material inside the container 3, for example. If 3 is prepared, the efficiency of refining can be improved by exchanging these with each other.

[0024]

According to the present invention, since the container for molten metal can be attached and detached without disassembling the trunnion shaft and the rotary ring, the container can be used as it is without transferring the molten metal after refining to another pot or the like. Molten metal can be directly poured into the mold by transporting it with a crane, etc. Since there is no transfer work and heat loss can be avoided, the yield can be greatly improved.

If at least two containers are prepared, continuous repair can be performed by setting repaired ones on the rotary ring when repairing or exchanging the refractory material inside, and small scale operation is possible. It can also be used favorably for small-scale production with improvement.

[Brief description of drawings]

FIG. 1 is a cutaway front view showing the entire structure of a rotary refining furnace of the present invention.

FIG. 2 is a cutaway plan view of the rotary refining furnace of FIG.

FIG. 3 is a cutaway front view of a container.

FIG. 4 is a view taken along the line AA of FIG.

[Explanation of symbols]

 1: Trunnion shaft 1a, 1b: Rotation guide roll 1c, 1d: Axial guide roll 2: Rotation ring 2a, 2b: Flange 2c: Rack 2d: Holding seat 2e: Receiving seat 2f: Rotating block 2g: Implant bolt 2h: Nut 3: Container 3a: Main body 3b: Lid 3c: Opening 3d: Hanging metal fitting 3e: Upper ring 3f: Lower metal object 4: Rotating spindle 4a: Pinion 5: Tilt drive motor 6: Rotation drive motor

Claims (1)

[Claims] 1. A trunnion which is rotatably connected to a tiltable trunnion shaft so that a container for molten metal can rotate about its axis, and includes an axis in a plane orthogonal to the tilt direction of the trunnion shaft. In a rotary refining apparatus including a rotating ring connected to a shaft, the container has a cone-shaped upper end and an opening at an end, and is connected to the rotating ring so that the container can be inserted and removed from above, thereby rotating the container. A rotary refining device comprising means for preventing displacement of a container for holding the container in the axial direction and in a direction orthogonal to the axial direction, in the rotating ring.