JPH0583698U - Hearth exchange device for arc furnace - Google Patents

Abstract

(57) [Summary] [Purpose] To enable quick and easy replacement of the hearth of an arc furnace in a good working environment. [Structure] A lifting device 3 provided on a traveling carriage 1, and a slide table 5 provided on the lifting device 3 and movable horizontally.
And a turning table 8 provided on the slide table 5 and capable of turning horizontally, and a hearth 1 provided on the turning table 8.
And a spring device 9 for supporting 0, and the hearth 10 is supported and replaced by the spring device 9 on the turning table 8.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hearth exchange device for an arc furnace used for exchanging a hearth in a steelmaking arc furnace in which scrap such as iron is melted, refined and regenerated by an arc.

[0002]

[Prior Art]

 When the refractory in the arc furnace is worn out and the hearth is replaced, conventionally, a person has entered the arc furnace to perform the replacement work.

[0003]

[Problems to be solved by the device]

 Conventionally, work cannot be performed until the temperature inside the arc furnace has dropped, so the down time of the arc furnace is prolonged, and refractory replacement work inside the arc furnace must be performed in a bad working environment in high temperature and dust. There was a flaw that had to be made.

The present invention has a structure in which the hearth of the arc furnace can be cut off from the furnace body of the arc furnace to be replaced in order to solve the above-mentioned conventional drawbacks. It is an object of the present invention to provide a hearth exchange device for an arc furnace that can be operated in a favorable working environment.

[0005]

[Means for Solving the Problems]

 The present invention relates to an elevating device provided on a traveling carriage, a slide table provided on the elevating device and horizontally movable, a swing table provided on the slide table and horizontally swingable, and the swing table. A hearth exchange device for an arc furnace, comprising: a spring device provided above and supporting the hearth.

[0006]

[Action]

 By raising and lowering the slide table with the lifting device and adjusting the front-rear, left-right position of the slide table and the orientation of the swivel table, the hearth is supported on the swivel table via the spring device and the furnace is easily installed. The floor can be replaced.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view of an embodiment of the present invention, in which a traveling carriage 1 travels between a furnace body 2 of an arc furnace and a crane (not shown). If there is such a situation, a steel receiving cart or the like can be used as the traveling cart 1.

A pantograph-shaped lifting device 3 is provided on the traveling carriage 1. A horizontal support table 4 is attached to the upper part of the lifting device 3 and the lifting device 3 is operated by a hydraulic device (not shown) or the like. This allows the support table 4 to be raised and lowered.

A slide table 5 is placed on the support table 4 so as to slide horizontally, and a plurality of hydraulic jacks 6 mounted on the support table 4 in front, rear, left and right directions are operated. By doing so, the slide table 5 can be moved back and forth and left and right on the support table 4.

A swivel bearing 7 is attached to the center of the upper surface of the slide table 5, and the swivel bearing 7 supports the swivel table 8 so that the swivel table 8 can be swung horizontally on the slide table 5. A plurality of spring devices 9 are mounted on the turntable 8 to support the hearth 10 as will be described below. Reference numeral 11 is a refractory material attached to the hearth 10.

FIG. 2 is an enlarged vertical cross-sectional view of the spring device 9. A spring 12 is mounted on the revolving table 8, and a lower end of the spring 12 is fixed to the revolving table 8 on the outer periphery of the spring 12. A cover 13 is arranged, and a lid 14 is arranged on the upper end of the spring 12. A spring set bolt 15 is provided at the center of the spring 12, the upper end of the spring set bolt 15 projects above the lid 14 to form a spherical projection 16, and the lower end of the spring set bolt 15 is the upper surface of the swivel table 8. Through a large hole in the rotary table 8 and is stopped by a nut 18 from the back side of the upper surface of the turntable 8 through a spherical washer 17.

An exchange hearth-side flange 19 is provided on the side of the hearth 10 that can be detached from the furnace body 2 for replacement and is fixed to the lower surface thereof. The ball seat 20 can be placed on a spherical projection 16 protruding above the lid 14. A taper hole 21 is formed on the upper surface of the exchange hearth side flange 19 so that the taper hole 21 is widened upward. The taper hole 21 is projected on the lower surface of the furnace body side flange 22 and has a small diameter on the lower side. It is adapted to be fitted with the tapered pin 23 that is formed. A hydraulic jack cradle 24 can be attached to the exchange hearth side flange 19.

The operation of exchanging the hearth of the arc furnace by using the above described hearth hearth exchange device will be described below.

When removing the hearth 10 from the furnace body 2, as shown in FIG. 1, the traveling carriage 1 is moved to a position right below the furnace body 2 and stopped, and the lifting device 3 is raised to move the turning table 7 to the furnace. Approach the underside of floor 10. Then, the slide table 5 is slid on the support table 4 to adjust the front, rear, left and right positions, and the swivel table 8 is swiveled to adjust the direction, so that the spherical projection 16 shown in FIG. Let

In this state, the furnace body 2 and the hearth 10 are disconnected from each other, and a hydraulic jack (not shown) is inserted between the furnace body side flange 22 and the hydraulic jack cradle 24 to push down the hearth 10. The seat 20 rides on the spherical projection 16, and the spring 12 cushions the shock, and the old hearth 10 is supported on the swivel table 8 as shown in FIG. Then, the elevating device is lowered, the traveling carriage 1 is moved from under the furnace body 2 to under the crane (not shown), the old hearth 10 is removed from the top of the turning table 8 by the crane, and the new hearth 10 is turned. 8 is supported by a spring device 9.

A traveling carriage 1 supporting a new hearth 10 on a revolving table 8 is run just below the furnace body 2 and stopped, and the elevating device 3 is raised and the slide table 5 is slid on the support table 4. The new hearth 10 is aligned with the center of the furnace body 2 by moving it to adjust the front, rear, left and right positions. When the turning table 8 is turned to align the taper hole 21 shown in FIG. 2 with the position of the taper pin 23 and the elevating device 3 is further raised, the taper hole 21 and the taper pin 23 are fitted. At this time, even if the inclinations of the furnace body side flange 22 and the exchange hearth side flange 19 are slightly different, the spring device 9 bends when pressed by the elevating device 3, and the furnace body side flange 22 and the exchange hearth side flange 19 are bent. And can be closely attached. In this state, the hearth 10 is connected and fixed to the furnace body 2. Further, the hearth 10 is supported by the spherical seat 20 and the spherical projection 16, and since the spherical washer 17 is attached to the lower end of the spring 12, the spring set bolt 15 can be tilted, and the taper pin 23 and the taper hole 21 can be tilted. Some misalignment can be corrected by inserting into.

[0018]

[Effect of the device]

 Since the present invention allows a person to replace the hearth without entering the arc furnace, the hearth can be replaced quickly and easily, and the arc furnace downtime is shortened to improve productivity. There is an effect that the work is improved, the hearth replacement work becomes safer, and the working environment becomes better.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional view of a spring device.

[Explanation of symbols]

 1 Traveling vehicle 3 Lifting device 5 Sliding table 8 Turning table 9 Spring device 10 Hearth

Claims (1)

[Scope of utility model registration request] 1. An elevating device provided on a traveling carriage, a slide table provided on the elevating device and capable of moving horizontally, a turning table provided on the slide table and capable of turning horizontally, and the turning table. A hearth exchange device for an arc furnace, comprising: a spring device provided above and supporting the hearth.