WO1996012572A1

WO1996012572A1 - Slab feed yard

Info

Publication number: WO1996012572A1
Application number: PCT/JP1995/002193
Authority: WO
Inventors: Masayoshi Takahashi; Takuma Morita
Original assignee: Nippon Steel Corporation; Nippon Steel Information & Communication Systems Inc.
Priority date: 1994-10-25
Filing date: 1995-10-25
Publication date: 1996-05-02
Also published as: CN1137765A; JP3080099B2; KR970700068A

Abstract

A slab feed yard disposed between a continuous casting machine and a hot rolling step to reliably feed the physical flows of slabs via a plurality of routes to the hot rolling step in accordance with the sequence of rolling commands. A slab transfer table having a linear shape is disposed in such a manner as to extend from the continuous casting machine to the hot rolling mill, and a plurality of slab stock yards which are so juxtaposed as to transversely cross the slab transfer table and transfer means capable of transferring both hot and cold slabs between the slab transfer table and the slab stock yard are disposed between the continuous casting machine and a heating furnace charging table disposed upstream the hot rolling mill.

Description

Slab supply yard

Technical field

The present invention relates to a slab supply pad.

Background art

For example, a continuous slab of steel (a piece) is converted to a hot rolling equipment (

In order to supply the hot slab to the hot rolling mill,

In order to use it, the hot slab after forming is immediately charged into the heating furnace of the hot rolling equipment, heated to a temperature suitable for hot rolling, and supplied to a hot rolling mill (hereinafter referred to as DHCR). The hot slab is temporarily stored in a storage pit to wait for the rolling order, etc., and stored while suppressing the decrease in the retained heat of the hot slab.Then, the stored hot slab is sequentially loaded into the heating furnace in the rolling order. As described above, it is used as a buffer for heating and supplying to the hot rolling mill (hereinafter referred to as HCR), and for dealing with the difference in processing capacity between the continuous and hot rolling mills and equipment failure. A high-temperature slab (hereinafter referred to as “hot slab”) that has been systematically cooled after 铸 slab, and 疵 a low-temperature slab (hereinafter referred to as “cold slab”) such as a slab that has been cooled for maintenance due to surface defects found Store in a slab yard This leads to a heating furnace in accordance with the rolling sequence is performed three types of work tasks supplied after heating the same manner as described above to hot rolling mill (hereinafter referred to as CCR).

When supplying such slabs, the heating (furnace) of the hot slab and the cold slab are divided, and energy saving in the heating furnace is to be achieved while maintaining the production balance of the continuous forming machine and the hot rolling mill. Is disclosed in Japanese Patent Application Laid-Open No. 106501/1989. However, in the supply of slabs as described above, the distribution system of hot slabs becomes fully operational when supplying hot slabs, and the distribution system of cold slabs operates fully when supplying cold slabs. There are issues such as inefficiency due to the multiple responses. The present invention has been made in order to advantageously solve such a problem, and is not limited to the above-described three-route slab supply, but is also capable of accurately adjusting the consistency and rolling timing of a plurality of routes of slabs. The purpose of the present invention is to provide a slab supply yard that enables efficient and reliable slab logistics and improves productivity. Disclosure of the invention

The slab supply yard of the present invention comprises: a linear slab transfer table between a continuous machine and a heating furnace charging table; and a plurality of slab stock yards arranged in parallel across the slab transfer table. A hot and cold slab is shared between the slab transport table and the slab stock yard.

In such a slab supply card, as a CCR, for example, among the slabs manufactured by a continuous machine, heat slabs that require strict surface treatment with high-grade materials (high-grade materials) are required. , While being transferred on a slab transfer table (roller table, etc.), pushes the slab out of the table with a pusher to the slab receiving table, and pushes out the heated slab to the slab receiving table on the ceiling crane and other slab transfer tables and slab stocker. The hot and cold slabs can be transferred to and from the slab by a transfer means that can transfer the slabs to the required slab stock yard.After cooling, the surface is treated with a grinder or the like to form a cold slab. Temporarily in a slab stock jar. In addition, the hot slab where large flaws, etc., that needed to be removed during manufacturing, etc. occurred on the surface, was treated in the same manner as above to produce a cold slab, and necessary surface care was performed. Later, temporarily store it in a slab stock yard. In addition, if the equipment is stopped in a process below the continuous forming machine (process), such as a hot rolling mill, the operation of the continuous forming machine and the steelmaking furnace (converter, etc.) in the upper process will be stopped. In order to prevent this, the structure is continued without interruption even during operation of the lower process, and the structure slab is transferred to the slab stock yard as described above and temporarily stored as a cold slab. It is transferred to the slab transfer table according to the rolling order, transferred to the heating furnace, heated, and then supplied to the hot rolling mill.

On the other hand, DHCR, for example, is not so strict in terms of quality or material, has a wide heating range suitable for hot rolling in a heating furnace before hot rolling, and has not strict surface care. In other words, if the hot slab has a high degree of freedom in hot rolling, it is transferred to the heating furnace charging table directly by the slab transfer table and heated without storing the hot slab after fabrication in the slab stock yard. Charged into a furnace, heated and fed to a hot rolling mill. In addition, the HCR is a delivery means that can transfer both hot and cold slabs between the slab transport table and the slab stock yard and to the hot slab storage pit of the required slab stock yard. It is only necessary to store once, transfer it to the slab transfer table in the same manner as described above in the order of rolling, transfer it to the heating furnace, heat it, and supply it to the hot rolling mill.

Further, a slab transfer line for inspection and / or maintenance of a hot slab is provided between the continuous machine output side and a slab stocker near the continuous machine output side in parallel with the linear slab transfer table. By providing this, it is possible to carry out inspections and hands-on work online without cooling the hot slab, so that strict quality materials and strict material materials can be manufactured by HCR. Means for transporting slabs across the slab transport line for thermal slab inspection and Z or maintenance, and between the slab transport table for direct hot slab transport (for example, transfer equipment such as traverse cars or ceiling crane) The slab logistics system can be greatly improved and HCR can be performed with high-grade materials.

In this way, the three types of logistics, CCR, HCR, and DHCR, flow between a continuous slab transport table extending from the continuous machine exit to the heating furnace loading table, and between the slab transport table and the slab stock yard. Heating furnace according to the order of rolling order without distinction between hot slab and cold slab by combining simple transportation means consisting of delivery means that can deliver hot and cold slabs together and multiple slab stockers Slabs can be supplied in the exact order of rolling, and the productivity can be improved because the consistency of the logistics and the timing can be grasped at one place before the heating furnace. In addition, the buffer function is exhibited even when the operation of the lower process is interrupted, and the operation of the upper process can be continued without any trouble. As an operation of the DHCR as described above, for example, after manufacturing, transfer the slab at 900 to 1 000 ° C to the slab transport table and store it in the slab stock yard without charging the heating furnace After being transferred to a table, it is heated in a heating furnace to 110 to 1300 ° C depending on the composition of the steel, and then supplied to a hot rolling mill. As for the operation of the HCR, the slab at 900 to 1 000 ° C is transferred to the slab transfer table after fabrication as described above, and then rolled to the hot slab storage pit of the slab stock yard in the order of the rolling command. Store temporarily for waiting. The storage pit preferably has a space for storing several slabs in piles, and the storage time is desirably a time at which the slab temperature can be maintained at about 400 ° C or more. In other words, when the temperature is lower than 400 ° C, it takes a long time to heat to 110 to 1300 ° C, which is suitable for hot rolling in a heating furnace. It is not preferable because it can be difficult to supply to the rolling mill.

The storage time can be adjusted by the number (quantity) of hot slabs loaded into the hot slab storage pit. That is, If the number is too large, the temperature of the heat slab will drop slowly due to heat radiation.On the other hand, if the number of loaded sheets is small, the temperature of the heat slab will decrease quickly due to heat radiation. The storage time can be adjusted for a quick response. Specifically, store 5 to 8 sheets in a normal size thermal slab of about 1 000 ° C, and in a pit that suppresses heat release by the lid, allow 8 to 12 hours until the temperature drops to about 400 ° C. During this time, it is possible to wait for the rolling order. However, in order to improve the responsiveness of the heat slab to the heating temperature (shortening the residence time in the heating furnace), it is preferable that the temperature of the heat slab be higher. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a plan view of the slab car.

FIG. 3 is a front view of the slab car.

FIG. 4 is a side view of the slab car.

Fig. 5 is a front view showing the state where the loading slab is located on the lifter.

FIG. 6 is a front view showing a state where the loaded slab is transferred from the slab force to the lifter.

FIG. 7 is a front view showing a state where the loading slab is transferred from the lifter to the transfer table.

FIG. 8 is a front view showing a state in which the transfer of the loading slab is completed.

FIG. 9 is a block diagram showing an example of the transfer route determining means and the transfer control. BEST MODE FOR CARRYING OUT THE INVENTION

Next, the best mode for carrying out the present invention will be described with reference to the drawings. O

In Fig. 1, reference numerals 1 and 1a denote two continuous machines arranged at required intervals, and a strand table 2, 2a, Rails 3 are laid at the ends of 2b and 2c in a direction perpendicular to these rails, and a traverse mechanism is provided on which the traverse cars 4 and 4a are movable. A linear slab transfer table 5 using a roller table system connected through this traverse mechanism and a slab transfer table 5 a constituting a slab transfer table line for direct hot slab parallel to the slab transfer table 5 are connected to a heating furnace. It is arranged so as to reach the hot rolling mill 25 through the heating furnace charging table 7 and the heating furnace outlet table 24. In addition, between the continuous forming machines 1 and 1a and the heating furnace loading table 7 and the heating furnace outlet table 24 in front of the hot rolling mill, the slab transfer tables 5 and 5a are traversed at right angles. The first, second, third, and fourth slab stockyards 11, 11a, lib, and 11c of multiple buildings are arranged in the direction. On both sides of one slab transfer table 5, the slab transfer table 5 extends from the intermediate second and third slab stock yards 11a and 11b to immediately before the heating furnace charging table 7. Slab car moving paths 9 and 9a are provided along which the slab cars 8 and 8a can move along rails. Then, a fourth slab stock yard 11 which is located near the heating furnace charging table 7 at the end of the slab car moving paths 9 and 9a and is close to the heating furnace charging table 7 described above. In c, a slab transfer machine 10 is provided.

In the first slab storage yard 11, there are a plurality of slab cooling areas 12, 12a and slab care areas 13, 13a, a care slab temporary storage area 14, a prepared slab temporary storage area 15, The second slab stocker 11a and the third slab stocker lib have hot slab storage pits 16, 16a and 16b, 16c, and cold slab stocker, respectively. Prefab yards 17 and 17a, cold slab yards 18 and 18a are arranged, and the fourth slab stock yard 11c has a reheat receiving cooling field 19 and a cold slab yard. A lab preparation yard 17b and a cold slab yard 18b are arranged. In the figure, 20 and 20a are weighing machines at the base end of the slab transfer tables 5 and 5a, and 21 and 21a are slab surface flaw inspection sites arranged ahead of the weighing machines 20 and 20a. 22, 22a and 23, 23a are pushers and slab receivers arranged along the slab transfer tables 5, 5a in the first slab stock yard 11, and 24 is a heating furnace 6. Heating furnace discharge table following heating furnace charging table 7, 25 is a hot rolling mill located at the extended end of slab transfer tables 5, 5a, and 19 is a hot rolling mill operated in the lower process after 25 When the supply of hot slabs is stopped due to the stoppage of the heating, the heating slab in the heating furnace 6 will be in a heating state for a long time, causing quality defects.

A slab transfer line 5b for inspection and / or maintenance of the hot slab is provided in parallel with the slab transfer table line for direct transfer of the hot slab, and the transfer line 5b includes a weighing machine 20b and a slab. A surface defect detection device 35 and a surface defect care device 36 are arranged in this order.

In such a slab supply yard, for example, a hot slab produced by the continuous forming machine 1 is received by the traverse car 4 via the strand tables 2 and 2a and discharged to the slab transport tables 5 and 5a. Then, the slabs are temporarily stopped on the weighing machines 20 and 20a arranged on the slab transfer tables 5 and 5a, and are transferred to the slab surface inspection sites 21 and 21a after a single slab is measured. After a temporary stop and surface inspection here, the hot slab determined to require surface maintenance is pushed out of the slab transfer tables 5, 5a by the pushers 22, 22a during transfer. Then, the extruded hot slab requiring surface treatment is transferred to the slab receivers 23 and 23a, and the first slab stock is moved by the overhead traveling crane (not shown). Transfer to the slab cooling yard 12 of the yard 11 and cool down and maintain it.Move to the slab temporary storage yard 14 and then move to the slab maintenance yard 13 to grind the flaws on the slab surface. After that, the slab is turned upside down by the reversing machine 26, the slab back side is positioned on the upper side, transferred to the slab care area 13a, similarly cleaned, and then weighed in the first slab stock yard 11 Measure the weight at 20 b and store it in the groomed slab temporary storage 15. Thereafter, the vehicle travels on a slab car moving path 9b provided from the first slab stock yard 11 to the fourth slab stock yard 11c by an overhead traveling crane (not shown). It is transferred to the slab car 8b and runs on the rail, and the second slab stock card lla, the third slab stock card 11b and the fourth slab stock card 11b It is sent to the cold slab yard of c, 18, 18a, 18b where it is stocked. Then, the stocked cooling slab is transported in advance to the cold slab preparation yards 17, 17a, 17b by an overhead traveling crane (not shown) in accordance with the rolling order.

In addition to the stocking as a cold slab as described above, when equipment stoppage occurs due to equipment trouble in the process below the hot rolling mill 25, the continuous manufacturing machine 1, 1a starts the process in the upper process. As described above, the entire heat slab of the continuous machine was transferred to the slab receiving table 23 by the pusher 22 while being transferred on the slab transfer table 5 to avoid operation stoppage or production reduction. To the cold slab yards 18 and 18a and 18b, where they are stocked as cold slabs until operation resumes in the lower process. Store to cold slab preparation yards 17 and 17a and 17b in order.

On the other hand, among the heat slabs that do not require surface care after continuous production as described above, those that can be processed immediately by the hot rolling mill 25 are led directly to the heating furnace 6 by the slab transfer tables 5 and 5a. Suitable temperature for hot rolling In order to heat it, it is transferred to the heating furnace loading table 7 by the slab transfer tables 5 and 5a, charged into the heating furnace 6 and heated, then discharged to the heating furnace exit side table 24 and heated through the slab transfer table 5a. To the cold rolling mill 25. The thermal slab in which the defect is detected by the surface defect detection device 35 is surely removed by the online defect care device 35. It is preferable to provide both a scarfing device and a grinder single-handling device as the defect caring device, but it is possible to use either one. Inspection and care of the back of the heated slab can be performed on the transfer line 5b by a slab reversing machine (not shown) provided on the slab transfer line 5b. By using a slab reversing machine (not shown) provided other than the transfer line 5b, the transfer of the heat slab between the reversing machine other than the transfer line 5b and the transfer line 5b by the slab transfer means. It is also possible by performing If the operation of the defect inspection equipment and / or the defect care equipment has a function to be remotely controlled, for example, the operator of the heating furnace or the rolling mill can perform the remote inspection of the heat slab for defect inspection and manual operation. It is more preferable because labor costs can be reduced and labor costs can prevent labor costs from increasing manufacturing costs. Also, although not shown, for example, an automatic defect detection device using a method described in JP-A-4-135047, JP-A-5-87745, etc. If it is arranged or applied to the surface defect detection device 35, the defect inspection of the thermal slab can be performed more efficiently and accurately, so that a defective product in the next process can be reduced.

For the hot slabs that do not require surface care after rolling, the rolling sequence is postponed. In the overhead traveling crane, the hot slab storage pits 16, 16 a, 1 6b and 16c, which are stored while waiting for a rolling command while suppressing the decrease in heat in the heat slab. The cooling slab stocked in the cold slab preparation yards 17, 17a, 17b and the hot slabs stored in the hot slab storage pits 16, 16a, 16b, 16c are mounted in a heating furnace in the order of the rolling instructions. When transporting the slab through the slab transport table 5, a plurality of slab cars 8 are loaded into the slab car 8 in the order of the rolling order by an overhead traveling crane (not shown), and then the slab is moved along the single slab moving path 9. Stops immediately below the loading machine 10 and transfers it one by one to the slab transfer table 5 in the pick-up crane 27, transports it to the charging table 7 on the inlet side of the heating furnace, and charges the heating furnace 6 and exits the heating furnace after heating. It is delivered to the side table 24 and supplied to the hot rolling mill 25 from the slab transfer table 5a.

In this way, the logistics route that directly guides the hot slab after fabrication to the heating furnace, the logistics route that guides the heated slab once stored in the hot slab storage pit to the heating furnace, and the cooling slab preparation yard. The three routes of the logistics route, which leads the cold slab to the heating furnace, are transferred from the continuous machine 1, la across the slab stockers 11, 11a, lib, and 11c. Delivery of both hot and cold slabs between the linear slab transfer tables 5 and 5a laid toward the intermediary rolling mill 25 and the slab stock yards 11, 11a, lib, and 11c The three routes are integrated by a delivery means that can be delivered, and supplied via the heating furnace 6 in accordance with the rolling order.

When two continuous forming machines 1 and 1a are provided side by side as in the embodiment, the hot slab after forming is heated to a temperature suitable for hot rolling in parallel with the linear slab transfer table 5. Slab conveyor table line, which is directly heated to the hot rolling mill 25, and is provided with a line in which the slab transfer table 5a is provided with the direct-feed heating furnace 28, and the hot slab after fabrication is directly transferred to the hot-rolling mill 25. After heating to a temperature suitable for hot rolling in the heating furnace 28, it is directly supplied to the hot rolling mill 25 to function as a slab supply yard (especially, a slab distribution function). Can be significantly improved. Next, slab transfer by the slab transfer machine 10 provided in the vicinity of the heating furnace charging table 7 corresponding to the forward part of the slab car moving path 9 will be described.

As shown in FIGS. 2, 3 and 4, the truck 30 of the slab car 8 which is movable on the slab car moving path 9 is formed with a lifter one passage groove 29. A plurality of slabs 31 are sequentially loaded and run on the slab moving path 9 as shown in FIG. 1, and the position of the lifter 1 32 of the slab transfer machine 10 is stopped as shown in FIG. Next, as shown in FIG. 6, the lifter 32 lifts the lifter 32 through the lifter passage groove 29 provided on the bogie 30 of the slab car 8 to lift the slab 31 on the bogie 30. As shown in Fig. 7, the pick-up plane 27 moves on the gantry 34, grasps the slabs 31 on the lifter 32 one by one, transfers them to the slab transfer table 5, and heats them as shown in Fig. 1. It is transferred to the furnace charging table 7 and charged into the heating furnace 6. On the other hand, the slab force 8 returns to the predetermined loading position (for example, the position where the slab 31 is loaded). Another slab force 8a mainly transfers the slabs of the hot slab storage pits 16a and 16c to the slab transfer machine 10, and the function of the slab force 8a is the same as that of the slab car 8. The slab cars 8, 8a are moved simultaneously or sequentially.

When the transfer of the slab 31 on the lifter 32 to the slab transport table 5 is completed in this way, the lifter 32 descends and prepares to receive the slab force 18 as shown in FIG. This slab car 8 has hot slab storage pits 16 and 16b of slab slab yards 11a and 11b, cold slab preparation yards 17 and 17a, and cold slab yards 18 and 18a as shown in Fig. 1. Is transferred to the slab transfer machine 10. The first slab stock yard 11 a close to the continuous machine 1 is located near the slab care area 13 a and the fourth slab stock yard 11 c immediately before the heating furnace charging table 7. A slab moving path 9b similar to the slab moving path 9 is laid between the slab moving path 9 and the slab car 8 for transferring between slab stock yards.

The surface defects of the slab can be estimated from the slab composition and the manufacturing conditions, and the degree of influence on the process after the surface defects are repaired and the final product can be estimated from the required specifications of the materials (products, intermediate process products, etc.).铸 It is possible to estimate the degree of surface defects and the degree of maintenance based on the manufacturing conditions and the required specifications of the material or material, and determine the transport route of the slab. As an example of a means for determining the transfer route, as shown in FIG. 9, a data processing function comprising a structure information storage unit 37, a material requirement specification storage unit 38, and a slab transfer route determination unit 39 is provided to the process computer 43. Provide. Further, since the slab flow monitoring system 42 can identify the position of each slab between the continuous forming machine and the rolling mill, the slab can be slab-stowed along the determined transport path. It is also possible to transfer to and from any place in the yard, the transport table, and the inspection and maintenance work area. Reference numeral 40 denotes a slab transfer path display unit, and reference numeral 41 denotes a transfer control device. Industrial applicability

As described above in detail, the present invention provides a linear slab transfer table from a continuous forming machine to a hot rolling mill, and a heating device provided in front of the continuous forming machine and the hot rolling mill. A plurality of slab stock jars are arranged in parallel across the slab transfer table between the furnace loading table and hot and cold slabs between the slab transfer table and the slab stock yard. By providing a delivery means that can perform delivery together, the consistency and timing of multiple routes of slab logistics from the continuous machine exit side to the heating furnace charging table in the hot rolling process in accordance with the rolling command order Progress management with a single transport means. Since the operation management can be performed accurately, it is possible to obtain excellent effects such as shortening the delivery time of the product and improving the productivity.

Claims

The scope of the claims

1. Between the continuous forming machine and the heating furnace charging table in front of the hot rolling mill

A linear slab transfer table for supplying the slab to the heating furnace, a plurality of slab storage tanks provided in parallel across the slab transfer table, and a space between the slab transfer table and the slab storage yard. A slab supply yard characterized by the provision of a delivery means for both hot and cold slabs.

2. The slab supply yard according to claim 1, wherein a slab transfer table line for direct hot slab transfer is provided between the continuous forming machine and the heating furnace charging table in parallel with the linear slab transfer table. .

3. The slab supply yard according to claim 1, wherein a slab moving means is further provided between said plurality of slab stock yards in parallel.

4. Provide a slab cooling area in the slab storage yard, and a slab storage area in the slab storage yard near the continuous machine, and a slab storage area in front of the intermediate and / or heating furnace charging table. 4. The slab supply yard according to claim 1, wherein the slab is provided with a hot slab storage pit.

5. The hot and cold slab delivery means can move on the overhead traveling crane and the slab car moving path provided along the slab carrying table from the middle slab storage to the heating furnace charging table. Slab car, a slab transfer machine provided at the end of the slab car moving path and immediately before the heating furnace charging table, and the slab stock yard of the plurality of parallel buildings. The slab supply yard according to any one of claims 1 to 4, comprising a transfer slab car.

6. The slab transfer machine collectively receives the loaded slab on the slab that has reached the end of the slab force-moving path, and the lifter collectively receives the loaded slab. The slab supply yard according to claim 5, comprising a pick-up crane that supplies slabs from the slab to the slab transfer table in rolling order.

7. The slab feeder according to any one of claims 1 to 6, wherein a slab transfer table for inspecting the thermal slab and for Z or maintenance is provided in parallel with the linear slab transfer table.

8. Cross the slab transport table for inspection and Z or maintenance of the above-mentioned thermal slab, and connect the bracket slab transport table with the slab transport table for direct thermal slab transport and / or the linear slab transport table. The slab supply yard according to any one of claims 1 to 7, wherein a slab transfer means is provided therebetween.

9. The slab supply yard according to claim 7 or 8, wherein the inspection and / or maintenance equipment for the hot slab in the slab supply yard has a remote control mechanism.

10. The slab supply yard according to any one of claims 1 to 9, further comprising means for determining a suitable slab transport path in the slab supply yard based on manufacturing conditions and Z or required specifications of the material.

11. The slab supply yard according to any one of claims 1 to 10, further comprising means for controlling the slab transport path based on the result obtained by said slab transport path determination means.