JPS6032096Y2 - Mounting structure of converter mouth fittings - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a mounting structure for a furnace mouth fitting to be attached to the upper furnace mouth portion of a converter.

As shown in Fig. 1, in a converter 1, a furnace mouth hardware 2 is generally installed for the purpose of protecting the furnace mouth and holding down the bricks. It is attached to the furnace mouth flange 4 using a real pin 3.

The mounting pin 3 is loaded with loads such as the force due to the expansion of the bricks 5, the weight of the bricks when the converter 1 is tilted, the force due to thermal distortion of the converter body and the furnace mouthpiece, and the dead weight of the furnace mouthpiece 2. If the fastening method is weak or loosens, accidents such as bricks falling off or furnace mouth fittings 2 falling may occur.

As shown in FIG. 2, the conventional converter mouth fitting structure is to stack the furnace mouth fitting 2 on the furnace mouth flange 4 provided at the upper part of the converter 1, and attach the flange 4 to the furnace mouth fitting 2. A stepped hole 7 communicating with the pin hole 6 is provided, and the pin hole 6 is connected from the stepped hole 7 of the furnace mouth hardware 2.
A long hole 8 is provided in the shaft portion 3a of the headed pin 3 protruding from the lower surface of the furnace mouth flange 4, and a taper cutter 9 is driven into this long hole 8 to connect the furnace mouth flange 4 and the furnace mouth. The hardware 2 is fixed and held by welding to the headed pin 3 and the bolt 9 in a fixed state.

However, with the above structure, the headed pin lacks strength due to the elongated hole 8, and the cotter 9 lacks durability, especially at its narrow tip end.

That is, as mentioned above, when a strong force is applied to the headed pin 3 and the cotter 9 due to the uplifting force caused by brick expansion, the above-mentioned weak parts of the headed pin 3 and the cotter 9 break, and this is the cause. In this case, there is a problem in that the metal parts at the furnace mouth float up or fall, and even the bricks fall.

This idea was made to solve the above-mentioned problems, and provides a mounting structure that can securely fix the furnace mouth flange and the furnace mouth hardware, and prevent the furnace mouth hardware or bricks from falling. The purpose is to

The structure of this invention is that a taper liner is driven between a taper washer fitted into a headed pin and a nut screwed onto the headed pin, and the taper liner and washer are fixed by welding, reducing the strength of the headed pin. This eliminates the strength limitations of the furnace mouthpiece and prevents the metal fittings from falling.

This invention will be explained below with reference to FIGS. 3 and 4 of the accompanying drawings.

As shown in Fig. 3, the furnace opening flange 4 installed at the top of the converter 1
The furnace mouth hardware 2 is stacked on top, and the furnace mouth hardware 2 has a flange 4.
A stepped hole 7 communicating with the pin hole 6 is provided.

The headed pin 11 inserted into the pin hole 6 from the stepped hole 7 has a length such that its shaft portion 11a projects by a predetermined length onto the lower surface of the furnace mouth flange 4, and this shaft portion 11a projects from the flange 4. A male thread 12 is formed at the tip, and a nut 13 is screwed into the male thread 12 portion.

As shown in FIG. 3, the distance between the mounting position of the headed pin 11 and the steel shell of the converter 1 is narrow, so that it is difficult to tighten the nut 13 to a position where it contacts the lower surface of the flange 4.

For this reason, before screwing the nut 13 into the male thread 12 part, the taper washer 14 that contacts the flange 4 is fitted into the part of the shaft part 11a of the headed pin 11 that protrudes from the lower surface of the flange 4, and the taper washer 14 and Tightening is performed by driving a taper liner 15 between the nuts 13.

As shown in FIG. 4, the taper liner 15 is formed in a U-shape in plan to fit around the shaft portion 11a, and is fitted with the taper washer 1.
4 and the nut 13, and then fixed by welding to the taper washer 14 to completely prevent loosening.

The mounting structure of this invention has the above-mentioned configuration, and in order to fix the furnace mouthpiece 2, a headed pin 11 is inserted into the pin hole 6 from the attachment hole 7 of the furnace mouthpiece 2 stacked on the flange 4. After fitting and inserting the taper washer 14 into the shaft portion 11a at the lower part of the flange 4, the nut 13 is screwed onto the male thread 12.
Then, with the taper directions of the taper washer 14 and the taper liner 15 aligned, the taper liner 15 is driven between the nut 13 and the taper washer 14, and the washer 14 and the taper liner 15 By fixing by welding, the furnace mouth metal fittings 2 can be completely fixed as shown in FIG.

As described above, according to this invention, the furnace mouth hardware and the furnace mouth flange are tightened by driving a U-shaped taper liner between the taper washer fitted into the headed pin and the similarly screwed nut. As a result, there is no need to provide a long hole in the headed pin, and there is no part where the strength decreases, and
The taper liner can be formed with sufficient width and thickness, so there will be no breakage of the headed pin or taper liner.Furthermore, since the taper liner and taper washer are fixed by welding, there will be no loosening, and the furnace mouth metal fittings will be made of brick. Falling can be reliably prevented.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view showing the conventional mounting structure, Fig. 2 is an enlarged vertical cross-sectional view of the main parts of the same, Fig. 3 is a longitudinal cross-sectional view showing the mounting structure of this invention, and Fig. 4 is the same as the above. FIG. 1 is a converter, 2 is a furnace mouth fitting, 4 is a furnace mouth flange, 6 is a pin hole, 7 is a stepped hole, 11 is a headed pin, 12 is a male thread, 13
is a nut, 14 is a taper washer, and 15 is a taper liner.

Claims (1)

[Scope of utility model registration request] A tapered pin is inserted into the overlapping part of the converter mouth flange and the furnace mouth hardware from the furnace mouth hardware side, and the shaft of the headed pin that protrudes from the furnace mouth flange is inserted so as to be in contact with the furnace mouth flange. Attach the washer and the nut screwed onto the tip of the shaft,
A converter mouth metal fitting for a converter, characterized in that a taper liner formed in a U-shape in plan is press-fitted into the shaft between the taper washer and the nut, and the taper liner and taper washer are fixed by welding. mounting structure.