JPS58123811A - Method for removing body of converter - Google Patents

Abstract

PURPOSE:To remove a furnace body without receiving interference from surrounding structures by cutting off part of the bottom of the inverted furnace body in the upper part of a trunnion ring, and winding and rewinding the pulleys of the rigging mounted to the supporting beam placed on the top surface of said ring and the position in the furnace near the furnace port. CONSTITUTION:A furnace body 1 which is partly cut off in the bottom is supported in an inverted position on a trunnion ring 2 and a supporting beam 5 is placed horizontally on the ring 2. Thereafter, a steel wire rope which is wound much on either of a pulley 7 suspended from an eye fitting 18 mounted to the bottom surface at the center of the beam 5 or an another pulley 6 provided with a swivel fitting and is further fixed at the other end at four points in the furnace body adjacent to a furnace port 12 by means of shackles 10 is wound up. Thus, the body 1 is lifted relatively with the ring 2 and plural pawl members 4 latching the body 1 to the ring 2 are cut off; thereafter, the wire rope 8 is unwound and the body 1 is removed from the ring 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for removing a converter body, and more particularly to a method for removing a converter body from an operating position for repair.

The specification of Japanese Patent Application No. 56-86999 states that the furnace body is inverted to an inverted position, and a first frame placed on the trunnion ring and a second frame applied to the lower part of the furnace mouth are mounted. Rather than winding up the rigging suspended on the attached pulley, the trunnion ring of the furnace body is used to support it in an inverted position, the claw member that locks the trunnion ring to the furnace body is removed, and the rigging is wound. The method of lowering the furnace body along with the second return cradle and removing it from the trunnion ring is shown. The method disclosed in the above-mentioned application is a significant improvement over the previous method of suspending the furnace body by using support beams that are passed along the running path of the overhead lane in the factory. It can be quickly and easily removed from the trunnion ring of the furnace body without interfering with the operation of the adjacent converter or the operation of the adjacent converter, thereby improving work safety. However, recently, in order to improve safety within the factory, a heat shield has been installed adjacent to the converter and around its outer periphery. In the method of the above application, since the first and second mounts are installed outside adjacent to the furnace body, there is a risk that these mounts, especially the first mount, may interfere with the heat shield plate, making it difficult to perform the work smoothly. There is. Also, 1st. Since a plurality of riggings are disposed between the second frames, it becomes difficult to synchronize the winding and unwinding of all the riggings.

. The present invention aims to solve this type of problem that arises in the furnace body removal method disclosed in the above-mentioned application.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for extracting a trunnion ring from a furnace body placed in an inverted position without interference from structures such as heat shields installed around the converter.

According to the present invention, the furnace body is inverted to an inverted position, a part of the furnace bottom is cut out at the top of the trunnion ring, and the support beam placed on the upper surface of the trunnion ring and the furnace adjacent to the furnace mouth are removed. The rigging suspended from the slides attached to the inner position and the inner position is supported by the trunnion ring of the furnace body, and then the claw member that locks the trunnion ring to the furnace body is removed and the rigging is removed. A method for removing a converter body is provided, which comprises lowering the unwinding furnace body and extracting it from a trunnion ring.

An embodiment of the method of the present invention will now be described with reference to the accompanying drawings.

Fig. 1 shows the method described in Japanese Patent Application No. 56-86999, in which a first frame 2 consisting of an I-shaped frame is shown.
0 is fitted on the outside of the bottom part of the furnace body 1 in an inverted state and placed on the top surface of the trunnion ring 2, and a second pedestal 21, also made of an I-shaped frame, is placed under the mouth part 12. It is placed on the side. The I-shaped frame is a trunnion.
Since it protrudes outward from the outer periphery of ring 2, furnace body 1
A heat shield (not shown) installed adjacent to and on the outside of the
This will cause a problem (Fig. 1 (h)).

In addition, as will be explained later, there is a risk that the furnace support ring 3 peeking out from the outer periphery of the furnace body 1 may interfere with the heat shield plate. There are multiple steel cables to be strung across, but winding up and unwinding these multiple steel cables at the same time is quite a tedious task, saving labor and time. 1. Figures 2 (α) and (b) show the method of the present invention,
A part of the bottom of the furnace body L was removed and the trunnion ring 2
Supported in an inverted position on top. A support beam 5 consisting of a single bar is placed horizontally over the diameter of the opening in the hearth bottom.

A pulley 7 hangs down from an eye fitting 18 attached to the lower center surface of the support beam 5.

Another pulley 6 with a swivel fitting is placed below the pulley 7, and a steel cable 8 is suspended multiple times between the pulleys 6 and 7. One end of the steel cable 8 is fixed to one of the two pulleys 6 and 7, and the other end is fixed to one of the two pulleys 6 and 7. It is connected to a suitable winch (not shown). Furnace mouth 1
Eye fittings 9α are located at four positions adjacent to 2 and facing each other in the furnace.

9b is installed. These eye fittings 9α, 9b
Four short steel cables 11α with one end connected to each
11b connects the opposite end to a shackle 10 that hangs down from the pulley 6 with the swivel fitting. Therefore, it can be seen that the furnace body l is suspended from one support beam 5 placed on the upper surface of the trunnion ring 2 via four points inside the furnace body adjacent to the furnace mouth 12. By winding the steel cable 8 in this state, the furnace body 1 is lifted relative to the trunnion ring 2, and the claw member 4 that locks the furnace body 1 to the trunnion ring 2 is spaced between the trunnion ring 2 and the furnace body 1. It creates a gap.

Therefore, when all the claw members 4 are removed, the furnace body 1 can be lowered and removed from the trunnion ring 2.

Figure 3 shows one of the steps of attaching a support beam 5 made of a single bar to the opening of the furnace body 1, which has been inverted to an inverted position with the furnace bottom removed, and the furnace body l is in an inverted position. The hearth bottom portion 13 is cut out before being turned over. Trunnion
A support beam 5 made of a single bar whose one end is connected to the furnace body 1 by a hinge fitting 17 at a position adjacent to the ring 2 is suspended horizontally by a hook 19 of a crane. In this state, when the furnace body 1 is rotated around the runner axis (not shown) and placed in an inverted position, the support beam 5 can be placed in the position shown in FIG. 2(α)I(b)K very easily. It will be destroyed.

FIG. 4 shows a support ring 3 that supports the furnace body l on the trunnion ring 2. The support ring 3 extends in the diametrical direction of the furnace body 1 in correspondence with the trunnion axis (not shown). A portion 14 is provided.

The projecting portion 14 has a mechanism that interferes with a heat shield plate installed on the outer periphery of the furnace body 1. However, in the method of the present invention, the steel cable 8
Since the pulley 6 is suspended by a swivel metal fitting, the furnace body 1 can be rotated around the vertical central axis YY (FIG. 2) and interference with the heat shield plate can be prevented.

Figure 5 shows the furnace body 1 removed from the trunnion ring 2.
The figure shows how the steel is loaded onto the steel receiving cart 15 and transported to a desired position using the track 16.

As described above, according to the present invention, not only does it not interfere with the operation of the overhead running lane and the waste gas boiler above the furnace body, but it also does not interfere with the heat shield plate attached to the outer periphery adjacent to the furnace body. The furnace body can be removed from the trunnion ring without having to remove the furnace body from the trunnion ring. Furthermore, since the rigging pulleys that suspend and support the furnace body are arranged inside the furnace body, they do not interfere with equipment outside the furnace at all. In addition, the size and quantity of equipment used in the furnace body removal work can be reduced to a minimum, resulting in a significant reduction in work costs.

[Brief explanation of the drawing]

Fig. 1 is a side view and a plan view showing the conventional method, Fig. 2 is a side view and a plan view showing the method of the present invention, and Fig. 3 is a modification of the process for attaching the support beam shown in the method shown in Fig. 2. 4 is a plan view showing the support ring attached to the outer periphery of the furnace body, and FIG. 5 is a front view showing the furnace body being removed from the trunnion ring and being carried out by a cart. 25 Trunnion (L) C each)

Claims (1)

[Claims] Turn over the furnace body to an inverted position and place a part of the furnace bottom in the tranio.
The furnace body is cut out at the top of the trunnion ring and hung on pulleys attached to the support beam placed on the top surface of the trunnion ring and the position in the furnace adjacent to the furnace mouth. The converter is supported by a trunnion ring, and then the claw members locking the trunnion ring to the furnace body are removed, the rigging is rewound, the furnace body is lowered, and the converter is removed from the trunnion shaft. How to remove the body.