JPS6054368B2 - How to bring steel materials into the heating furnace - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for carrying steel materials into a heating furnace.

Conventionally, the steel material carried into the heating furnace was once stored outdoors, and in such cases, the steel material was carried into the heating furnace in accordance with the steel material delivery pitch required by the rolling equipment, which is a process after the heating furnace. is common. That is,
Since the amount of steel held in the heating furnace is approximately constant under normal operating conditions, the amount of steel carried into the heating furnace is adjusted to synchronize with the steel material delivery pitch required by the rolling equipment. However, for example, by directly connecting continuous casting equipment and rolling equipment, the slabs cast by the continuous casting equipment (
When conveying (bloom, billet, beam blank, etc.) to a subsequent rolling facility, a heating furnace installed on the route to rolling equipment such as continuous casting equipment is used to transport the continuous casting equipment's slab extraction pitch and rolling equipment. It must be operated in accordance with both the slab delivery pitch required by the equipment. In other words, normally, the slab extraction pitch of the continuous casting equipment and the slab delivery pitch required by the rolling equipment do not match, so it is necessary to synchronize both pitches in the heating furnace itself. In response to this problem, a multi-segment walking beam type heating furnace has been proposed in which the hearth is multi-segmented and a driving device is provided for each section. This is an attempt to absorb the pitch difference by separately operating the walking beam on the steel intake side and the walking beam on the steel extraction side in the heating furnace. This heating furnace has significant restrictions such as the ability to absorb the pitch difference, the amount of steel material stored, and the heating furnace capacity.In other words, the larger the pitch difference, the lower the heating furnace capacity and the difficulty of operation when changing the size of steel material. There were problems such as complexity and lack of functional variation. The purpose of the present invention is to solve such problems, and the steel material that has been conveyed to the roller table by the transfer table is transferred to the boundary between the heating zone and the preheating zone formed in the heating furnace by the roller table. If the steel material discharge pitch of the heating furnace is relatively faster than the steel material delivery/input pitch, the steel material is taken into the heating zone by a walking beam provided in the heating zone, heated in the heating zone, and then heated at the end of the heating zone. On the other hand, if the steel material discharge pitch of the heating furnace is slower than the steel material delivery pitch, a part of the steel material is taken into the preheating zone by a walking beam provided in the preheating zone and accumulated. This objective is achieved by providing a method for carrying in steel materials, which not only absorbs the pitch difference between the steel material delivery pitch and the steel material discharge pitch from the heating furnace, but also has an internal pre-heating zone. By using a heating furnace formed with a heating furnace, it is possible to efficiently operate the heating furnace in response to various conditions.

The method of the present invention will be explained in detail below based on the drawings showing one embodiment thereof.

In Figure 1, 1 is continuous casting equipment, and in this example 3
For example, bloom or billet slabs are extracted from each strand at the same time. 2 is a cutting roller table that continuously receives slabs extracted from the continuous casting equipment and cuts the slabs into predetermined lengths, and the temperature of the slabs here is considerably cooled from the temperature of the molten metal. The temperature is about 700'C, and the slab is in a solidified state.

Reference numeral 3 denotes a first transfer table for receiving the slab cut into a predetermined length from the cutting roller table 2 and transporting and placing the slab on the roller table 4 for carrying into the heating furnace. The first transfer table 3, which is orthogonal to the pass table 5, passes the slab conveyed in the longitudinal direction on the pass table 5. It rises from below the table 5, scoops up the slabs on the pass table 5, and sequentially moves the slabs to the roller table 4 for carrying into the heating furnace.

Reference numeral 6 denotes a stopper that restricts the slab conveyed in the longitudinal direction from the cutting roller table 2 onto the pass table 5 at a predetermined position on the pass table 5.

The roller table 4 for carrying into the heating furnace is parallel to the path table 5. The inner end side thereof extends near the lower part of the boundary between the heating zone and the preheating zone formed in the heating furnace 7 so as to pass through the heating furnace 7. 8 takes in slabs that are not carried into the heating/heating furnace 7 by the heating furnace carrying roller table 4 from among the slabs placed on the heating furnace carrying roller table 4, and transports and places them on the stock roller table 9. The second transfer table is installed so as to be orthogonal to the roller table 4 for carrying into the heating furnace and the roller table 9 for stock, and scoops up the slabs left on the roller table 4 for carrying into the heating furnace and transfers the slabs to the side of the roller table 9 for stock. Move sequentially to

The stock roller table 9 is provided parallel to the heating furnace loading roller table 4, and its rear end side extends to one side of the heating furnace 7. On the other hand, the heating furnace 7
A discharge roller table 11 for conveying the heated slab to the rolling equipment 10 is extended on the other side. In addition,
When there is no need to heat the slab, the slab extracted from the continuous casting equipment 1 is directly conveyed to the discharge roller table 11 via the cutting roller table 2, and then conveyed to the rolling equipment. In some cases. The configuration of the heating furnace 7 will be described based on FIG.

The heating furnace 7 is of a multi-segmented walking beam type, and has a heating zone 12 and a preheating zone 13 configured to be used as an accumulator zone formed inside, and the heating zone 12 has three sets of walking beams 14. A pair of walking beams 15 are provided in each of the preheating zones 13.
16 is an eccentric cam for raising and lowering each walking beam 15.

The movement of each of the walking beams 14 and 15 is electrically operated, hydraulic cylinder operated, etc., and moves in the order of forward → upward → backward → downward, as if drawing a parallelogram, and is transported on the roller table 4 for carrying into the heating furnace. When the incoming slabs are lifted to the upper part of the furnace using a table lifter, a lifter, etc., the heating zone side walking beam 14 or the pre-heating zone side walking beam 15 scoops up the slabs and discharges them one after another. It is transported to the roller table 11 side or the stock roller table 9 side. In addition, when lifting the cast slab from the roller table 4 for carrying into the heating furnace using a table lifting method, etc., the heating zone side walking beam 14 or the preheating zone side walking beam 15 moves to draw a parallelogram, and the boundary space is moved. Raise and lower at the same time as it expands. Roller table 1 for discharging slabs
1 is configured to be performed by a conventional extractor 17, which enters into the heating furnace 7 and lifts the slab, then retreats and transfers the slab to the heating furnace. 7, and then lowers and places the cast slab onto the discharge roller table 11. Incidentally, on the stock roller table 9 side, slabs are similarly extracted by the extractor 17. Reference numeral 18 denotes lids provided at openings 19 at both ends of the heating furnace 7, which can be raised and lowered.

The operation of this configuration will be explained next.

If the slab extraction pitch of the continuous casting equipment 1 and the slab delivery pitch required by the rolling equipment 10 are the same or the rolling capacity of the rolling equipment 10 is relatively large (capacity varies depending on the rolling size), the continuous casting equipment 1 The slabs extracted from the furnace are transported by the cutting roller table 2, the pass table 5, and the first transfer table 3 to the heating furnace loading roller table 4, and then inside the heating furnace 7 by the heating zone side walking beam 14. It is taken into the heating zone 12 and passed through, and is conveyed from the discharge roller table 11 to the rolling equipment 10. On the other hand, if the slab extraction pitch of the continuous casting equipment 1 is faster than the slab delivery pitch required by the rolling installation HIO, the heating zone side walking beam 14
The slab is taken into the heating zone 12 side, and a part of the continuously conveyed slab is also taken into the preheating zone 13 by the preheating zone side walking beam 15 and temporarily stored. As a result, the pitch difference between the slab extraction pitch of the continuous casting equipment 1 and the slab loading pitch required by the rolling equipment 10 is absorbed by the heating furnace 7 itself, and the slab loading pitch required by the rolling equipment 10 is adjusted. After being heated in the heating zone 12, the cast slab with the appropriate pitch is transferred from the discharge roller table 11 to the rolling equipment 10.
transported to. During these operations, the preheating zone 13 of the heating furnace 7 is used as an accumulator zone. In addition, if a trouble occurs in the rolling equipment 10, the slabs will be accumulated in the preheating zone 13 side, and if the preheating zone 13 is full, the accumulated slabs will be transferred to the walking beam 15 on the side of the preheating zone.
The stock is transported to the stock roller table 9 and used in an emergency. Note that normally, the slabs accumulated in the preheating zone 13 may be sent to the heating zone 12 as appropriate at a pitch that matches the slab delivery pitch required by the rolling equipment 10. On the other hand, when heating the stocked slabs, the heating furnace 1 is heated from the stock roller table 9.
By configuring it so that it can be transported to the walking beam 15 on the side of the preheating zone, the temperature can be raised stepwise from the preheating zone 13 to the heating zone 12 for heating. Further, the second transfer table 8 may be configured to take in slabs that do not need to be preheated from the roller table 4 for carrying into the heating furnace, and temporarily accumulate the slabs. They may be transported to the table 9 and stored separately. As described above, according to the method of the present invention, when the steel material discharge pitch of the heating furnace is slower than the slab carry-in pitch, a part of the steel material is accumulated in the preheating zone formed in the heating furnace. It is possible to absorb the pitch difference between the steel discharge pitch and the steel discharge pitch.

In addition, since a heating furnace with an internal pre-heating zone is used, this pre-heating zone can be used, for example, as an accumulator zone or as a pre-cooling zone, allowing efficient operation of the heating furnace in response to various conditions. can do.

[Brief explanation of drawings]

The drawings show one embodiment of the method of the present invention, and FIG. 1 is a schematic plan view of a place where a heating furnace is provided in the middle of the path between continuous casting equipment and rolling equipment, and FIG. A is an enlarged longitudinal cross-sectional view. 3...First transfer table, 4...
・・Roller table for carrying into the heating furnace, 7・・Heating furnace, 8・Second transfer table, 12・・・
... Heating zone, 13... Pre-warming zone, 14...
... Walking beam on the heating zone side, 15... Walking beam on the preheating zone side.

Claims (1)

[Claims] 1. The steel material transported to the roller table by the transfer table is carried into the boundary between the heating zone formed in the heating furnace and the preheating zone by the roller table, and the steel material discharge pitch of the heating furnace is made smaller than the steel material delivery pitch. If it is relatively fast, the steel material is taken into the heating zone by a walking beam provided in the heating zone, heated in the heating zone, and then discharged from the end of the heating zone, while the steel material discharge pitch of the heating furnace is the same as the steel material carry-in pitch. If it is slower, a part of the steel material is taken into the preheating zone by a walking beam provided in the preheating zone and accumulated, thereby absorbing the pitch difference between the steel material introduction pitch and the steel material discharge pitch from the heating furnace. A method of transporting steel materials into a heating furnace.