JPS6155566B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for removing converter bodies, 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 mount placed on the trunnion ring and a second mount placed on the lower part of the furnace mouth are installed. The furnace body is supported in an inverted position by the trunnion ring by winding the rigging suspended around the attached pulley, and the claw member that locks the trunnion ring to the furnace body is removed and the rigging is unwound. A method is shown in which the furnace body is lowered with two frames and removed from the trunnion ring. The method disclosed in the above-mentioned application is a significant improvement over the previous method of suspending the furnace body using a support beam spanned over the running path of an overhead crane in a factory. The furnace body can be quickly and easily removed from the trunnion ring without interfering with the operation of the adjacent converter, 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. Further, since there are a plurality of riggings disposed between the first and 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 furnace body placed in an inverted position from a trunnion ring without interference from structures such as heat shields attached 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 upper part of the trunnion ring, and a support beam placed on the upper surface of the trunnion ring and a position in the furnace adjacent to the furnace mouth are formed. The furnace body is supported by a trunnion ring, and then the claw member that locks the trunnion ring to the furnace body is removed, and the above-mentioned rigging is unwinded and the furnace body is supported by a trunnion ring. A method for removing a converter body is provided, which is characterized in that the body is lowered and removed from the trunnion ring.

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

Figure 1 shows the method described in Japanese Patent Application No. 1986-86999, in which a first frame 20 consisting of an I-shaped frame is fitted onto the outside of the bottom part of the furnace body 1 which is in an inverted state. A second mount 2 is placed on the upper surface of the trunnion ring 2 and is also made of an I-shaped frame.
1 is applied to the lower side of the furnace mouth portion 12. Since both of the square-shaped frames protrude outward from the outer periphery of the trunnion ring 2, a heat shield plate (not shown) is attached to the outside of the furnace body 1 adjacent to it.
This will cause a problem (Figure 1b). Also,
As will be explained later, there is a possibility that the furnace body support ring 3 attached to the outer periphery of the furnace body 1 may interfere with the heat shield plate. Furthermore, there are a plurality of steel cables stretched between the first and second frames 20 and 21, and it is quite a troublesome task to wind up and unwind these multiple steel cables in synchronization. consumes effort and time.

Figures 2a and b illustrate the method of the invention,
A furnace body 1 is supported in an inverted position on a trunnion ring 2 with a portion of the furnace bottom cut out. 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 is suspended 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 hung multiple times around 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 opposite end is fixed to one of the two pulleys 6 and 7. It is connected to a suitable winch (not shown). Eye fittings 9 are installed at four mutually opposing positions in the furnace adjacent to the furnace mouth 12.
a and 9b are attached. Four short steel cables 11a, 11b have one end connected to each of these eye fittings 9a, 9b, and the opposite end is connected to a shackle 10 hanging from the pulley 6 with swivel fittings. Therefore, it can be seen that the furnace body 1 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. In this state, by winding the steel cable 8, the furnace body 1 is connected to the trunnion ring 2.
This creates a gap between the pawl member 4 that locks the furnace body 1 to the trunnion ring 2 and the trunnion ring 2. Therefore, when all the claw members 4 are removed, the furnace body 1 can be lowered and removed from the trunnion ring 2.

FIG. 3 shows one of the steps for 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 bottom portion of the furnace removed.
The hearth bottom portion 13 has been cut out before it is turned over to the inverted position. A support beam 5 consisting of a single bar connected at one end to the furnace body 1 by a hinge fitting 17 adjacent to the trunnion ring 2 is suspended horizontally by a hook 19 of a crane. In this state, when the furnace body 1 is rotated around the trunnion shaft (not shown) and placed in an inverted position, the support beam 5 is very easily placed in the position shown in FIGS. 2a and 2b.

FIG. 4 shows the support ring 3 that supports the furnace body 1 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 protruding portion 14 may interfere with a heat shield plate installed on the outer periphery of the furnace body 1. However, in the method of the present invention, since the pulley 6 is suspended by the steel cable 8 and equipped with a swivel fitting, the furnace body 1 is aligned with the vertical center axis YY.
(Fig. 2) to prevent interference with the heat shield plate.

FIG. 5 shows the furnace body 1 removed from the trunnion ring 2 being mounted on the steel receiving truck 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 traveling crane 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 any trouble. Furthermore, the rigging pulleys that suspend and support the furnace body are arranged inside the furnace body, so that they do not interfere with the 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, and the cost of the work can be significantly reduced.

[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;
Figure 3 is a side view showing a modification of the process of installing the support beam shown in the method shown in Figure 2, Figure 4 is a plan view showing the support ring attached to the outer periphery of the furnace body, and Figure 5 is the attachment of the support beam from the trunnion ring. FIG. 3 is a front view showing the furnace body being removed and carried out by a trolley. 1...furnace body, 2...trunnion ring, 3...
... Furnace support ring, 4 ... Claw member, 5 ... Support beam, 6 ... Pulley with swivel fitting, 7 ... Pulley,
8... Steel cable, 9a, 9b... Eye fitting, 10...
Shackle, 11a, 11b...Steel cable, 12...
Furnace opening, 13... Hearth bottom, 14... Overhanging portion, 15...
...Dolly, 16...Track, 17...Hinge fitting, 1
8... Eye fitting, 19... Crane hook, 2
0...First mount, 21...Second mount, 22A, 2
2B... Steel cable, 23A, 23B... Pulley, 24
A, 24B...pulley, 25...trunnion.

Claims (1)

[Claims] 1. Invert the furnace body to an inverted position, cut out a part of the furnace bottom at the top of the trunnion ring, and attach it to the support beam placed on the top of the trunnion ring and the position in the furnace adjacent to the furnace mouth. The rigging suspended on the pulled pulley is wound up and the furnace body is supported by the trunnion ring.Then, the pawl member that locks the trunnion ring to the furnace body is removed, the rigging is reeled back, the furnace body is lowered, and the trunnion ．． A method for removing a converter body characterized by removing it from a ring.