JPH10195522A - Device for changing lance for treating molten metal and using method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mechanize attaching/detaching works of the upper end part of a lance for treating the molten metal so a lance holder through a screw. SOLUTION: The lance 1 for treating the molten metal is attached/detached to the lance holder 2 through the screw at the upper end part of the lance by normally rotating or reversely rotating a driving side gear 13 engaged with a gear 12 for rotating the lance arranged at the upper end part of the lance 1 for treating the molten metal with a device 11 for driving the lance rotation under condition of holding the lance 1 for treating the molten metal to be rotatably with plural supporting rollers arranged in the inside of clamp claws 10 to mechanize and automate the lance changing work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molten metal processing lance replacement in which an upper end portion of a molten metal processing lance for blowing gas or solid powder into a molten metal is attached to and detached from a lance holder via a screw. The present invention relates to an apparatus and a method for using the same.

[0002]

2. Description of the Related Art A lance for treating a molten metal is used to blow a gas or a solid powder together with a gas into the molten metal. For example, when performing pretreatment such as desiliconization and dephosphorization of hot metal in a mixed iron wheel, hot metal ladle, etc., a lance for molten metal treatment is immersed in the molten metal in the reaction vessel from the upper part of the reaction vessel, and the reaction from this lance Pretreatment of hot metal is performed by blowing gas or solid powder together with gas into the container. The lance for molten metal treatment is worn by the molten metal when it is immersed in high-temperature molten metal while being attached to the lance holder and blows gas or solid powder together with the gas. Lance must be removed from the lance holder and replaced with a new one.

[0003] Although the handling of the consumable molten metal processing lance to the position of connection to the lance holder is performed using a machine, the molten metal processing lance and the lance holder are replaced by connection and disconnection. In this method, the screw provided on the lance holder and the upper end of the lance is rotated by a human force, and is detached.

[0004]

With the above-mentioned conventional attachment / detachment method by fusing and welding the lance and the lance holder for treating molten metal, the work load on the worker is very large and the work efficiency is poor. On the other hand, in the means for attaching and detaching via a screw, the lance cannot be rotated while the molten metal processing lance is clamped, and the operator manually rotates the molten metal processing lance while the clamp is opened. As a result, it must be attached and detached via screws, and the workability is extremely poor. In addition, there is a problem in that work cannot be performed safely unless a stand for preventing the lance from falling is installed.

The present invention solves the above-mentioned conventional problems and mechanizes the operation of attaching and detaching the upper end portion of a lance for molten metal processing for blowing gas or solid powder together with gas into molten metal via a screw to a lance holder. It is an object of the present invention to provide a lance exchange apparatus for treating molten metal and a method of using the same.

[0006]

According to a first aspect of the present invention, there is provided a method for processing molten metal, wherein an upper end of a lance for molten metal processing is attached to and detached from a lance holder via a screw. A lance exchange device, a lance exchange truck traveling in parallel to the lance holder, and a horizontal support arm mounted to be extendable and contractible toward one side in the width direction of the truck by a driving device installed on the lance exchange truck, A clamp pawl that can be opened and closed via a lever link mechanism connected to a clamp cylinder disposed on the horizontal support arm, and a molten metal processing lance held rotatably in the circumferential direction inside the clamp pawl. A plurality of supporting rollers arranged so as to perform the above operation, and a lance rotating gear provided on an outer periphery of an upper portion of a molten metal processing lance rotatably held by the plurality of supporting rollers. A molten metal processing lance changing apparatus being characterized in that comprising a lance rotary drive device having a drive-side gear meshing with the lance rotation gear.

According to a second aspect of the present invention, there is provided a method of using the lance changing apparatus for treating molten metal according to the first aspect, wherein the width of the trolley is set by a driving device installed on a lance changing trolley running parallel to the lance holder. Molten metal by a plurality of support rollers disposed inside clamp claws which can be opened and closed via a lever link mechanism connected to a clamp cylinder disposed on a horizontal support arm which moves forward and backward in one direction. By holding the processing lance rotatably and rotating the drive side gear meshing with the lance rotation gear forward or reverse by the rotation drive device, the upper end of the molten metal processing lance is fixed to the fixed side via a screw. This is a method for using a lance exchange device for molten metal treatment, which is attached to or detached from a lance holder.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a lance changing apparatus for treating molten metal according to an embodiment of the present invention; As shown in FIGS. 1 and 2, an elevating guide via a shaft 23 is mounted on a bearing 21 provided at a leading end of the lancer 3 running on wheels 16 via wheels 19 on a rail 16.
15 is supported to be rotatable from horizontal to vertical. The lance lift table 4 provided with the lance holder 2 moves up and down on the lift guide 15 when it is raised vertically. Here, when the lance lifting platform 4 reaches the upper end of the lifting guide 15, the shaft 23 provided on the bearing 21 on the lancer 3 is
The lifting guide 15 is tilted horizontally with the fulcrum as a fulcrum, and the lance holder 2 arranged on the lance lifting platform 4 is in a horizontal state. Reference numeral 25 denotes a guide roller that guides the molten metal processing lance 1 mounted on the lance holder 2 supported by the lance lifting table 4 when the lance 1 moves up and down.

An arm extending / contracting cylinder 6 is mounted as a driving device on a lance exchange carriage 5 which travels on wheels 17 via rails 20 in parallel with the fixed-side lance holder 2 tilted horizontally on the lancer 3. The arm extending and retracting cylinder 6 moves back and forth toward one side in the width direction of the bogie.
The horizontal support arms 7 are connected. A clamping cylinder 8 is arranged on each horizontal support arm 7,
As shown in FIG. 3, a clamp claw 10 is connected to a piston rod 18 of a clamp cylinder 8 via a lever link mechanism 9 while being supported by a shaft 24 attached to a bearing 22 so as to be freely opened and closed. A plurality of support rollers 14 are arranged inside each clamp claw 10 so as to hold the molten metal processing lance 1 rotatably in the circumferential direction.

On one side of the horizontal support arm 7, a driving device 11 for rotating a lance having a driving gear 13 is provided.
A lance rotation gear 12 provided on the outer periphery of the upper part meshes with the lance. When mounting a new molten metal processing lance 1 on the fixed-side lance holder 2 tilted horizontally on the lancer 3, first, a clamping cylinder disposed on the horizontal support arm 7 of the lance exchange carriage 5 The new lance 1 for treating molten metal is held via the plurality of support rollers 14 by operating the extension and contraction of the clamp 8 and opening and closing the clamp pawl 10 via the lever link mechanism 9. In this state, the lance exchange carriage 5 is run, and the molten metal processing lance 1 is transported to the vicinity of the horizontally inclined fixed lance holder 2 on the lancer 3. After extending the cylinder 6 for extending and retracting the arm and aligning the lance 1 for molten metal treatment with the lance holder 2,
The lance exchange carriage 5 is run to bring the upper end of the molten metal processing lance 1 into contact with the lance holder 2.

A driving gear is driven by a driving device 11 for lance rotation.
13 is rotated to rotate the lance rotation gear 12 meshing with the lance 1 and the molten metal processing lance 1 is rotated forward (rotation in the screw fitting direction) to be provided at the upper end of the molten metal processing lance 1. A certain male screw is screwed into a female screw provided on the fixed-side lance holder 2 and mounted. When the mounting is completed, the clamp claw 10 is contracted by opening the clamp claw 10, and the arm extension / contraction cylinder 6 is further operated to retract the horizontal support arm 7.
To the waiting place to make it stand by.

In order to remove the worn molten metal processing lance 1 mounted on the fixed-side lance holder 2 that is horizontally tilted on the lancer 3, the clamp claw 10 is in a free state and is on standby. The lance exchange carriage 5 is moved to the position of the worn molten metal processing lance 1 mounted on the fixed-side lance holder 2. After the clamp cylinder 8 disposed on the horizontal support arm 7 is extended and the clamp pawl 10 is opened via the lever link mechanism 9, the arm retractable cylinder 6 is extended to open the clamp pawl 10. The position is adjusted so that the worn lance 1 for treating molten metal comes to the center. Subsequently, the clamped cylinder 8 is contracted to hold the worn lance 1 for molten metal treatment via a plurality of support rollers 14 disposed inside the clamp claws 10.

Next, the drive-side gear 13 is rotated by the lance rotation drive device 11, and the lance rotation gear meshes with the drive-side gear 13.
12 is rotated to reversely rotate the molten metal processing lance 1 (rotate in the screw loosening direction), so that the male screw provided at the upper end of the molten metal processing lance 1 is provided on the fixed-side lance holder 2. And loosen it. When the detachment is completed, the lance exchange carriage 5 is moved to the lance repair shop as it is, and the clamp cylinder 8 is contracted to open the clamp claw 10 and the worn lance 1 for the molten metal treatment.
Repair or discard.

[0014]

As described above, according to the present invention, the molten metal processing lance is rotatably held via a plurality of support rollers disposed inside the clamp claws. After the lance tip is brought into contact with the fixed-side lance holder, by rotating the drive-side gear meshing with the lance rotation gear provided at the upper end of the molten metal processing lance by a rotation drive device, forward or reverse rotation. Since the upper end of the molten metal processing lance is attached to or detached from the fixed lance holder via a screw, the mechanization and automation of the connection operation between the molten metal processing lance and the lance holder are achieved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a molten metal processing lance exchange device of the present invention.

FIG. 2 is a side view showing a molten metal processing lance exchange device of the present invention.

FIG. 3 is a side view showing the clamp device of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 lance for molten metal treatment 2 lance holder 3 lancer 4 lance lifter 5 lance exchange trolley 6 arm expansion and contraction cylinder 7 horizontal support arm 8 clamp cylinder 9 lever link mechanism 10 clamp claw 11 lance rotation drive device 12 lance rotation gear 13 Drive gear 14 Support roller 15 Elevating guide 16, 17 Rail 18 Piston rod 19, 20 Wheel 21, 22 Bearing 23, 24 shaft 25 Guide roller

Claims (2)

[Claims] 1. A lance exchange device for molten metal treatment, wherein an upper end of a lance for molten metal treatment is attached to and detached from a lance holder via a screw, the lance exchange carriage traveling parallel to the lance holder, A horizontal support arm is mounted on the lance exchange bogie so as to be able to expand and contract toward one side in the width direction of the bogie by a driving device, and a lever link mechanism connected to a clamping cylinder disposed on the horizontal support arm. A clamp claw that can be opened and closed freely, a plurality of support rollers disposed inside the clamp claw so as to rotatably hold a lance for treating molten metal in a circumferential direction thereof, and the plurality of support rollers A lance rotation driving device having a lance rotation gear provided on the upper outer periphery of a molten metal processing lance held rotatably on the lance and a driving side gear meshing with the lance rotation gear A lance exchange device for treating molten metal, comprising: 2. A method of using the lance exchange device for molten metal treatment according to claim 1, wherein the lance exchange device is mounted on a lance exchange vehicle traveling in parallel with the lance holder and is directed to one side in the width direction of the vehicle. The lance for treating molten metal can be rotated by a plurality of support rollers disposed inside clamp claws that can be opened and closed via a lever link mechanism connected to a clamping cylinder disposed on a horizontal support arm that moves forward and backward. By rotating the drive-side gear meshing with the lance rotation gear forward or backward by the rotation drive device, the upper end of the molten metal processing lance is attached to the fixed-side lance holder via a screw, or A method for using a lance exchange device for treating molten metal, which comprises separating the lance.