JPS6348681Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention is a pig iron mixer truck for transporting hot metal tapped from a blast furnace, etc. to a converter, etc., and in particular, a car with ends installed at both ends of the furnace body. This relates to a door bolt fixing mechanism.

[Conventional technology]

In a pig iron mixer car, refractory bricks are attached to the inner surface of the furnace body, and molten pig iron at a temperature of approximately 1500°C is filled. For this reason, the end door must be secured in a way that can sufficiently withstand the weight of hot metal, bricklaying pressure, and high temperatures.

Furthermore, when repairing or replacing bricks, the fixing method must be such that the end door can be easily fixed and removed within the cylindrical part at the end of the furnace body.

[Problem that the invention attempts to solve]

For the reasons mentioned above, the end door is fixed with multiple bolts, but due to variations in the tightening force of each bolt and fatigue caused by long-term use, the allowable stress of each bolt may decrease, or during use. There is a risk that a localized load such as deformation of the end door due to an excessive load greater than the design load may cause the end door to break along with the bolts, resulting in a serious accident.

The purpose of this invention is to prevent the door from being damaged as a whole by breaking the bolts in that area when a localized load as described above is applied.

[Means for solving problems]

In order to solve the above problems, this idea
In a pig iron mixer car that has an opening with removable end doors at both ends of the furnace body, when a load greater than the set load is applied to the plurality of bolts that fix the end doors to the opening of the furnace body, the bolts are It is provided with a breaking part for breaking.

[Effect]

Since this device has the above configuration, if an excessive load is applied to the end door for some reason during use, and as a result, an excessive load exceeding the design load is applied to some bolts, the end door will break before it breaks. The bolt breaks at its rupture point.

〔Example〕

In FIG. 3, 1 is a furnace body, and 2 is a multi-shaft bogie that supports both ends of the furnace body 1.

The furnace body 1 has a cylindrical shape with the same diameter over almost its entire length, but both ends are slightly constricted as short tapered parts 3, and a cylindrical part 4 with an open outer end is integrally formed at each end. Provided for.

As shown in FIG. 2, the tapered portion 3 is provided with an opening 5 which is closed by a removable end door 6, the inner surface of which is covered with firebrick 7.

Furthermore, to explain in detail, the annular body 8 made of a steel plate on the inner circumference of the tapered part 3 is fixed by means such as welding,
The inner periphery is defined as an opening 5.

Reference numeral 10 denotes a plurality of bolt insertion holes formed at regular intervals near the outer periphery of the end door 6;
The bolts 11 inserted through the circular body 8 are screwed into a plurality of screw holes 12 provided in the annular body 8 to fix the body.

The inner end of the screw hole 12 is closed by welding a lid 14,
Screw hole 1 is used for fireproof mortar etc. when installing fireproof bricks.
I'm trying not to fall into 2.

The bolt 11 has a hexagonal head 15,
A circumferential groove-shaped fracture portion 16 is formed near the head 15.

Further, a planar spanner engaging portion 17 is provided adjacent to the breaking portion 16. An annular spacer 18 is provided on the outside of the bolt 11 between the head 15 and the end door 6, and spring washers 19 are placed on the front and rear sides of the bolt 11 so that the spanner engaging part and the broken part 16 come out from the outer surface of the end door 6. Put on.

In this embodiment, each bolt 11 is tightened to a predetermined tightening torque using a torque wrench.

In this way, when the openings 5 at both ends of the furnace body 1 are closed by the end doors 6 and the pig iron mixer is in use, if an excessive load exceeding the design load is applied locally to the end doors 6, the bolts 11 in that part are When the end door 6 is subjected to a load greater than the set load, it breaks from the breakage portion 16, thereby preventing the end door 6 from being damaged.

〔effect〕

Since this invention fixes the end door to the opening of the furnace body with a plurality of bolts as described above, it is easy to install, and the workability is good because it is only necessary to tighten the bolts with a torque wrench. Further, each bolt is provided with a breaking portion so that when an excessive load is applied to the end door, the bolt breaks before the door is damaged, thereby preventing serious accidents such as damage to the end door.

In addition, if a spacer and a spring washer are sandwiched between the bolt head and the end door as in the example, and a broken part of the bolt and a spanner engagement part are provided in this part, the bolt will break at the broken part. After the head is removed, the spacer and spring washer are removed to expose the spanner engaging portion of the bolt. Therefore, the remaining bolt can be easily removed from the screw hole by applying a spanner to this part.

[Brief explanation of the drawing]

FIG. 1 is an enlarged vertical side view of this invention, FIG. 2 is an enlarged vertical side view of the end of the furnace body, and FIG. 3 is a side view of the pig iron mixer. 1...furnace body, 5...opening, 6...end door, 11...bolt 15...bolt head, 16...
...Broken portion, 17...Spanner engaging portion, 18...Spacer, 19...Spring washer.

Claims (1)

[Claims for Utility Model Registration] 1. A pig iron mixer vehicle having a cylindrical part with open outer ends at both ends of the furnace body, and an opening having a removable end door at the inner end of the cylindrical part. An end door fixing mechanism in a mixed pig iron car, characterized in that a plurality of bolts fixing the end door to the opening of a furnace body is provided with a breaking part for breaking the bolts when a load exceeding a set load is applied to the bolts. . 2 The broken part of the bolt is provided between the outer surface of the end door and the head of the bolt that is distant from this outer surface,
An end door fixing mechanism for an iron mixer vehicle according to claim 1, characterized in that a spacer and a spring washer are interposed in the bolt between the outer surface of the end door and the head of the bolt.