JP2001205316A - Steel conveying system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably perform operation and conveyance of slabs, steel or the like coping with a trouble on a finishing line or the like. SOLUTION: This system is a steel conveying system by which rolled steel 6 is successively charged on a cooling bed 5 and extracted onto the finishing line 7 while conveying and cooling on this cooling bed. A buffer zone 21 is formed on the outlet side of the cooling bed, when the steel on the cooling bed is cooled to a temperature not higher than a specified temperature, the steel is extracted to the finishing line without being left in the buffer zone and, when the trouble occurres on the finishing line or the steel which is transferred on this side of the buffer zone or in the buffer zone is not yet cooled to the specified temperature, the steel is left in the buffer zone and, when prescribed conditions are satisfied, the steel is extracted onto the finishing line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel material transport system used in a steel plant or the like, and more particularly to a buffer buffer for a cooling floor installed between a heating and rolling production process and a refining line production process. Improve the work, the transport material (slab,
(Steel products).

[0002]

2. Description of the Related Art This type of steel material transfer system has a structure as shown in FIG. However, in this figure, only the heating furnace and the cooling floor are viewed from above.

In this transfer system, slabs 2,... (Hereinafter referred to as steel materials after a rolling line) heated in a heating furnace 1 are transferred to a rolling line 3 by, for example, a walking beam transfer method. It is conveyed to the downstream side of the rolling line 3 while being rolled down to a desired thickness and width by the upper rolling mill 4. A cooling floor 5 is arranged on one side of the downstream end of the rolling line 3, and the rolled steel material 6 is transferred from the downstream end of the rolling line 3 into the cooling floor 5 by a chain or the like (not shown). In the cooling floor, the steel plate 6 is naturally cooled while being sequentially conveyed using, for example, a disk roller transfer system. As a result, the slab 2 heated to, for example, about 1200 on the outlet side of the heating furnace,
After cooling to a predetermined temperature of 00 to 200 degrees, the steel material 6 on the cooling floor exit roller is lifted while being raised from a low position between the rollers of the disk roller system, transferred to the refining line 7, and then lowered again. Then, the steel material 6 on the outlet side of the cooling floor is extracted into the refinement line 7 by, for example, a carrier chain transfer method in which the steel material 6 returns to the cooling floor 5.

In the refining line 7, the steel material 6 is trimmed to a product width by a side trimmer 8, further cut to a desired length by a cutting machine 9, and carried out as a product.

Accordingly, the cooling floor 5 described above not only naturally cools the steel material 6 but also serves as a buffer buffer for the production process of the upstream heating furnace 1 and the rolling line 3 and the production process of the downstream refining line 7. Has a role. As a result, even if the operation of the refining line 7 stops due to a trouble, the rolling line 3
It is not necessary to stop the operation of the rolling line 3 abruptly, and the stoppage of the operation of the rolling line 3 does not immediately lead to the stoppage of the operation of the refinement line 7.

[0006] By the way, when the steel material is conveyed in the cooling floor 5,
2 for “Left-justification (extraction priority)” and “Last-justification (loading priority)”
There are two transport methods.

[0007] This pre-packing (extraction priority) is an extraction method in which when the extraction table 7a located on the cooling floor exit side becomes empty, the steel material 6 at the exit side of the cooling floor 5 is continuously extracted with priority. Meanwhile, when the steel material 6 comes from the rolling line 3, if there is an empty space on the entrance side of the cooling floor 5, the cooling floor 5
Is inserted at the entrance side.

However, in such a steel material transport system, when the capacity of the refining line 7 exceeds the capacity of the rolling line 3, the steel material 6 is sent to the refining line 7 more and more. As shown, the interval between the steel materials 6 may be large.

If a trouble occurs in the refinement line 7 in such a state, the steel material 6 can no longer be charged into the cooling floor 5, and the operation of the rolling line 3 is stopped in a state where the occupation rate of the cooling floor 5 is very poor. Must.

On the other hand, rear-loading (charging priority) is a transfer system in which steel material 6 is charged into the cooling floor 5 every time the steel material 6 comes from the rolling line 3. Therefore, according to this transfer method, by continuing to load the steel material 6 into the cooling floor 5, the already charged steel material 6 gradually advances to the cooling floor 5 outlet side. Then, when the steel material 6 reaches the extraction end of the cooling floor 5, the steel material 6 is extracted to the refinement line 7.

The loading priority will be specifically described with reference to FIG.

First, the steel material 6 carried into the cooling floor 5 entrance side
-1 is immediately charged into the cooling bed 5 inlet. After charging, the next steel material 6-2 is waited at the entrance without being transported to the downstream side of the cooling floor 5. When the next steel material 6-2 is carried into the inlet side of the cooling floor 5, the steel material 6-2 is charged at the inlet side of the cooling floor 5,
At this time, the steel material 6-1 charged earlier is carried downstream by an amount corresponding to the space for charging the steel material 6-2, and is extracted to the refining line 7 only when the steel material 6-1 comes to the outlet side of the cooling floor 5. At this time, the interval 10 between the steel material 6-1 and the steel material 6-2 is often fixed.

[0013]

Accordingly, as is apparent from the above description, in order to increase the occupancy of the cooling floor 5, steel materials at the downstream end of the rolling line 3 are sequentially charged into the cooling floor entrance. It is desirable that “loading priority” be carried at a required interval 10 in the cooling floor 5.

However, in the case of the "loading priority", the following problem has been pointed out.

(1) Until the steel material 6 in the cooling floor 5 reaches the cooling floor outlet side, play can be made in the refinement line 7 located on the downstream side.

(2) If the cooling floor 5 is full of steel materials and a trouble occurs in the refining line 7, there is no room for placing the steel materials 6 on the cooling floor 5, so immediately stop the rolling of the upstream line. I have to help.

The present invention has been made in view of the above circumstances, and utilizes a cooling floor functioning as a buffer buffer to a maximum extent, thereby ensuring a stable operation of a conveying material (slab, steel material, etc.). Is to provide

[0018]

Means for Solving the Problems (1) In order to solve the above problems, a steel material transporting system according to the present invention sequentially loads rolled steel into a cooling floor in a charging priority mode, and in the cooling floor. In the steel material transfer system for extracting the refinement line while transferring and cooling, a buffer zone having a predetermined length is formed on the cooling floor outlet side, and when the steel material to be transferred in the cooling floor is cooled to a predetermined temperature or lower, Extracted into the refining line without placing in the buffer zone, trouble of this refining line, when the steel material in the buffer zone front side or the steel material in the buffer zone is not cooled below a predetermined temperature,
If it is placed in the buffer zone, the steel material being rolled can be smoothly loaded into the cooling floor excluding the buffer zone with priority on charging, and stable operation of the rolled steel material can be ensured, and the profile of the steel material to be rolled Can be rolled without any adverse effect.

(2) The slab heated in the heating furnace is rolled in a rolling line, and the rolled rolled steel material is sequentially charged in a cooling floor in a charging priority mode, and transported and cooled in the cooling floor. In the steel material transfer system to be extracted in the refining line, the buffer zone length is determined in consideration of the maximum number of steel materials placed on the rolling line, and the cooling floor outlet is determined based on the determined buffer zone length. Zone length determining means for forming a buffer zone on the side, the thickness of the steel material on the rolling line, the thickness of the steel material after the rolling of the heating furnace outlet side slab, the interval between the steel materials in the cooling floor, and the cooling floor outlet side excluding the buffer zone. Slab extraction suppressing means for extracting the slab to the rolling line while suppressing the slab on the outlet side of the heating furnace in accordance with the magnitude relationship with the empty space.

According to the present invention, by taking the above measures, the zone length determining means forms a buffer zone having an optimum length on the cooling floor, thereby preventing the rolling operation from being hindered. The upper steel material can be smoothly charged into the cooling floor with priority given to charging.

The length X of the buffer zone is determined on the basis of the following equation: X = BMAX * N + LP (N-1) + β. In the above equation, BMAX is the maximum thickness of the steel material after rolling, LP is the interval between the steel materials in the cooling floor, N is the maximum number of steel materials on the rolling line, and β is the allowance.

(3) The present invention relates to a steel material transfer system in which rolled steel materials are sequentially charged into a cooling floor in a charging priority mode, and are transported and cooled in the cooling floor and extracted to a refining line.
Substituting at least the permissible temperature and the like that can be extracted into the refinement line into a predetermined temperature model formula, and calculating the cooling time until a different type of steel material is inserted into the cooling floor and extracted into the refinement line. A cooling time calculating means for predicting a cooling time until one of the preceding one type of steel material becomes lower than or equal to an allowable temperature after extracting the other type of steel material, and charging the cooling floor within the predicted cooling time. And a steel material interval calculating means for calculating an interval between the different types of steel materials using the number of steel materials to be performed and the steel material transport speed in the cooling floor.

According to the present invention, by taking the above measures, even when the type of steel material, for example, a thin steel material is changed to a thick steel material, the steel materials of each type are separated from each other in the cooling floor with a distance between the steel materials. It is possible to reliably cool below a predetermined temperature.

(4) The slab heated in the heating furnace is rolled in a rolling line, and the rolled rolled steel material is sequentially charged into a cooling floor in a charging priority mode, and transported and cooled in the cooling floor. In the steel material transfer system to be extracted to the refining line, means for calculating the slab extraction time from the slab temperature on the exit side of the heating furnace to the slab extraction temperature, and from the start of slab extraction from the heating furnace to the entrance to the cooling floor Mill calculation means for calculating the time of, when the cooling floor exit side steel material reaches a temperature that can be extracted to the refinement line, the time addition value calculated by both means and the cooling floor from the cooling floor to the refinement line Compare with the extraction related time to pay out, and when the latter time is small, change the charging priority mode to the extraction priority mode and send an instruction to extract the cooling floor exit side steel material to the refinement line. means This is a configuration including:

According to the present invention, by taking the above measures, the heating furnace outlet side slab is not baked to a predetermined temperature while the charging priority is given, while the cooling floor outlet side steel material is Is cooled to a predetermined temperature or less, the steel material in the cooling floor can be extracted to the refinement line with priority given to extraction.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Prior to description of an embodiment according to the present invention, an electrical configuration of a steel material transport system will be described with reference to FIG. In the description of FIG. 13, the same components 1 to 9 as those in FIG. 13 will be described using the same reference numerals.

This steel material transport system comprises a host computer 11 for outputting a control instruction for a transport material (slab 2, steel material 6);
In accordance with the control instructions output from the host computer 11, the above-described heating of the slab 2, rolling of the slab 2 after the heating, cooling of the rolled steel 6 and final product processing by the refinement line 7 are performed. A steel material transfer facility 12 (see FIG. 13) which takes in and outputs a line state signal from an installed sensor (not shown), and a steel material transfer facility 1
2 and the upper-level computer 11, in particular, a sensor signal (e.g., a sensor signal () detected by various sensors installed on the side of the steel-material transporter 12 according to a control instruction from the upper-level computer 11. A state signal relating to the transfer material is received and transmitted to the host computer 11, and the steel transfer equipment 12 is controlled in accordance with a series of control instructions from the host computer 11, such as control of extraction, loading, and transfer of the slab 2 and the steel material 6. It is constituted by the transport controller 13.

The host computer 11 grasps the position of the conveyed material (slab 2, steel material 6) from the sensor output on the side of the steel material conveying equipment 12 based on a predetermined program, and has a tracking function for creating an operation timing. There is provided a position grasping means 14 and a conveyance setting means 15 for setting material conveyance in accordance with the operation timing of the material position grasping means 14 and outputting a control instruction to the conveyance controller 13 in accordance with the conveyance setting.

Accordingly, the present invention is premised on the configuration of the above-described steel plate transport system, and specific embodiments will be described below. FIG. 1 shows only the schematic configuration for understanding the system of the present invention, and is not necessarily limited to the configuration shown in FIG.

(First Embodiment) FIG. 2 is a configuration diagram showing one embodiment of a steel material transport system according to the present invention.
13, the same parts as those in FIGS. 13 to 15 are denoted by the same reference numerals, and detailed description thereof will be omitted. For convenience of description, only the cooling floor 5 is viewed from above, and the other parts are along the transfer line. Let's look at it.

In this steel material transport system, the relationship between the cooling floor 5 and the steel material 6 is based on the premise that charging is prioritized, and the steel material 6 is transported. This loading priority is already known as shown in FIG. 15 and causes the following problem.

That is, the charging priority is given to the purification line 7
When the trouble occurs in the cooling floor 5, or when the most downstream material in the cooling floor 5, that is, the steel material 6-1 closest to the outlet of the cooling floor 5 is not sufficiently cooled, the steel material 6 cannot be extracted from the cooling floor 5. As a result, the steel material 6 in the cooling floor 5 becomes full,
The cooling line 5 can no longer be charged from the rolling line 3
The steel material 6 being rolled is forced to be refused. In addition, the extraction from the heating furnace 1 must be stopped, which not only affects the stable control of the slab temperature of the heating furnace 1, but also in the case of smooth rolling control, the expansion profile of the rolling rolls should be increased by heating. Each time the steel material 6 comes
As shown in FIG. 3 (a), the expansion coefficient changes to a certain expansion coefficient which exhibits a rippled state. However, when the rolling roll stops and cools, the expansion profile of the rolling roll becomes stable as shown in FIG. 3 (b). In addition, there is a problem that adversely affects the profile of the steel material to be rolled subsequently.

Therefore, in the system of the present invention, as shown in FIG. 2, the buffer zone 21 is formed from the exit side of the cooling floor 5 to the position in the upstream direction Xm in the cooling floor as shown in FIG. At the same time, a temperature sensor 22 for detecting the temperature of the steel material 6 is provided on the entrance side of the buffer zone 21 or on the near side of the buffer zone 21, and a steel plate presence / absence sensor 23 is provided on the extraction table 7 a of the refinement line 7. Further, as described above, the steel material 6 in the cooling floor 5 is conveyed by using, for example, a disk roller transfer method, and when the steel material in front of the buffer zone including the buffer zone 21 is extracted into the refining line 7, for example, A chain transfer method is used. Numeral 24 denotes a cooling floor entrance side steel material presence / absence sensor.

Next, the operation of the steel material transport system configured as described above will be described with reference to FIG.

Now, when the steel material 6-1 conveyed by the disk roller transfer system enters the buffer zone 21 with the priority on charging (see FIGS. 4A and 4B).
The temperature sensor 22 detects the temperature of the steel material 6-1 and sends it to the host computer 11 via the controller 13. Here, if the steel material 6-1 is sufficiently cooled, that is, if the temperature of the steel material 6-1 is lower than the allowable maximum temperature (for example, 100 ° C.), the carrier chain transfer method is performed via the host computer 11 and the controller 13. To extract the steel material 6-1 at the entrance in the buffer zone 21 from the cooling floor 5 to the extraction table 7a (see FIG. 4C).

At this time, since the roller mechanism of the disk roller transfer system in the cooling floor 5 is independently driven, the steel materials 6-2, 6-3,. Are transported to a position as shown in FIG.

However, the steel 6 detected by the temperature sensor 22
When the temperature of -1 is higher than the maximum allowable temperature,
1 is left in the buffer zone 21 as it is.
In addition, after conveying the steel material 6-1 to the buffer zone 21,
Although the temperature of the steel 6-1 is detected by the temperature sensor 22, the temperature of the steel 6-1 may be detected just before the buffer zone 21 to determine whether or not to enter the buffer zone 21.

Also, if there is any trouble in the refining line 7 and the steel 6-1 cannot be extracted from the cooling floor 5, the steel 6-1, 6-2,... (See FIG. 5).

Thereafter, when a certain condition is satisfied, that is, when the temperature of the steel 6-1 becomes lower than the allowable maximum temperature and there is no other steel in the extraction table 7a, the steel 6-1 and 6- 2 and the like are extracted in the extraction table 7a of the refinement line 7. .. Are loaded on the cooling floor 5 while the steel materials 6-1, 6-2,... Are placed on the buffer zone 21 until the condition is satisfied.

Therefore, according to the above-described embodiment, the buffer zone 21 having a required interval Xm is provided in the upstream direction from the outlet side of the cooling bed 5 on the premise of charging priority. 6 is not cooled below the desired temperature, or when trouble occurs in the refining line 7, the steel 6
.. Are transferred to the buffer zone 21 while waiting for cooling or recovery from a trouble, so that the occupancy of the cooling floor 5, which is an effect of charging priority, can be increased.

The cooling floor 5 excluding the buffer zone 21
If the trouble of the refining line 7 occurs when the steel material is full,
Since the steel material 6 can be transferred to the buffer zone 21, the steel material 6 being rolled can be received in the cooling floor 5, and therefore, slab extraction from the heating furnace 1 and stabilization of the expansion coefficient profile of the rolling roll can be achieved. It is possible to secure stable operation of steel material transportation.

(Second Embodiment) FIG. 6 is a block diagram showing another embodiment of the steel material transfer system according to the present invention.
In this figure, the same parts as those in FIG. 13 to FIG.
For convenience of explanation, only the heating furnace 1 and the cooling floor 5 are viewed from above, and the others are viewed along the transport line.

In the first embodiment, the buffer zone 11 is formed in the cooling floor 5. However, when the length of the steel sheet in the cooling floor 5 in the conveying direction is fixed, the cooling zone can be extended by increasing the buffer zone 11. The length of cooling and conveying the steel material in the floor 5 is shortened, so that the play of the refining line 7 is reduced, and efficient operation is possible.

However, when the buffer zone 11 is long,
After one steel material 6 is extracted to the refining line 7 by the carrier chain transfer method, the time required to return the remaining steel materials 6,... To a predetermined position on the cooling floor 5 becomes longer, and the steel material 6 is transported to the entrance side of the cooling floor 5 accordingly. It will be made to wait for the coming steel material 6 to be accepted.

As a result, the operation of the rolling line 3 is disturbed, and if the cooling floor entry side table at the downstream end of the rolling line installed at the entrance side of the cooling floor 5 is weak in heat resistance, the steel 6 is refused. Must.

In the embodiment of the present invention, the buffer zone 1
1 is determined to be the optimum length, and the heating furnace 1
This is an example of suppressing extraction of a slab 2 from a slab. Therefore, in this embodiment, the transport setting means 15 of the host computer 11
At least a zone length determining means and a slab extraction suppressing means are provided.

First, the zone length determining means determines the optimum length of the buffer zone 11 as follows. That is, assuming that the maximum number of steel materials 6 that can be placed on the rolling line 3 is N, the buffer zone 11 is set to the following length X.

X = BMAX * N + LP (N−1) + β (1) X: Buffer zone length BMAX: Maximum thickness of steel material after rolling LP: Steel material spacing in cooling floor N: Load on rolling line 3 BMAX, N, LP, β are values that can be easily set in the design stage or in the control process by the host computer 11 in advance.

Next, the slab extraction suppressing means will be described with reference to FIG.

This steel material conveying system is systematically conveyed in a certain order with respect to heating of the slab 2 by the heating furnace 1, rolling of the slab 2 after the heating, charging of the steel material 6 after the rolling into the cooling floor 5, and the like. It is necessary to determine whether the following condition is satisfied for the slab 2 on the exit side of the heating furnace 1 and, when the condition is satisfied, the host computer 1
The extraction permission is given to the walking beam transfer mechanism from 1 through the controller 13, and the slab 11 is extracted from the heating furnace 1 to the rolling line 3.

The condition for suppressing the slab extraction is that a space is secured to allow the steel 6-1 on the rolling line 3 and the slab 2 on the exit side of the heating furnace 1 to be charged into the cooling floor 5. . For example, the steel material 6-1 is currently on the rolling line 3.
B1 + B2 + LP + α <Y (2) B1: Thickness of the slab 2 after rolling B2: Thickness of the steel material 6-1 after rolling LP: Spacing of the steel material in the cooling floor 5 α: Extra margin Y: Empty space on the exit side of the cooling floor If the relationship is established, an extraction permission signal is sent to the walking beam transfer mechanism, and the slab 11 is extracted from the heating furnace 1 to the rolling line 3. In the above equation, B1, B2, LP,
Y is a value that can be grasped in advance in the design stage or in the process of control by the host computer 11, and α is a value set in advance.

Actually, in addition to the above items, slab 2
May be included in the conditions for the extraction permission.

Therefore, according to the above-described embodiment, if the buffer zone length X is set by the above-described equation (1), the steel material placed on the rolling line 3 can be used. Thus, the rolling operation can be carried out without disturbing the rolling operation, and the rolling operation can be stabilized. Even if the steel 6 in the cooling bed 5 cannot be extracted to the refinement line 7 due to the trouble of the refinement line 7, it is only necessary to wait the slab 2 in the heating furnace,
The steel material on the rolling line can be reliably charged into the cooling floor 5.

In consideration of the fuel efficiency of the heating furnace 1, it is not preferable to make the slab wait at the extraction end of the heating furnace for a long time in terms of energy consumption. The slab 2 existing at the heating furnace extraction end has already been burned to the extraction target temperature, and the fuel consumption of the slab 2 is wasted for the subsequent furnace time. For example, the third slab from the heating furnace extraction end has not yet been baked to the target temperature, and if it is determined that extraction is not possible due to the above-mentioned trouble, the time to return and the remaining material furnace time of the own steel are predicted and heated. It is desirable to control the fuel for.

In order to cope with this, by adding an allowance to the maximum number N of steel materials in the above equation (1), even if the above troubles occur, up to two slabs at the extraction end of the heating furnace can be used. It is also possible to use N + 2 instead of N so that extraction can be performed unconditionally and charging to the rolling / cooling floor becomes possible. If the third slab from the heating furnace extraction end is heated at a reduced temperature, it greatly contributes to fuel saving as an application example of the present embodiment.

(Third Embodiment) FIG. 7 is a block diagram showing another embodiment of the steel material transfer system according to the present invention.
13, the same parts as those in FIGS. 13 to 15 are denoted by the same reference numerals, and detailed description thereof will be omitted. For convenience of description, only the cooling floor 5 is viewed from above.

In the first and second embodiments, it is assumed that the steel materials in the cooling floor 5 are arranged at equal intervals. However, in the embodiment of the present invention, the intervals between the steel materials in the cooling floor are set to the estimated cooling time. This is an example in which control is performed based on the following.

Now, the interval between the steel materials 6 is constant (for example, 5).
00 mm), for example, during the rolling, there may be a change from the thin steel material 6-1 to the thick steel material 6-2. In such a case, the upper computer 11 predicts the cooling time in the cooling floor corresponding to each of the steel materials 6-1 and 6-2 in advance, and controls the transport and extraction of the steel material in the cooling floor. Steel 6-1
After calculating the cooling time difference of 6-2, after the thin steel material 6-1 is extracted from the cooling floor 5, the number of steel materials to be charged within the time difference is predicted, and the thin steel material 6-1 and the thick steel material are estimated. Find the interval with 6-2. However, from the viewpoint of avoiding a decrease in the occupancy of the cooling floor 5, a minimum value is set for the steel material interval.

[0059] (1) using calculation method example below shows a temperature model equation of the cooling time (known model), by substituting the maximum allowable temperature (Ts MAX) for extracting the finishing line line 7 to T _PL of the formula Inversely calculate t. The time until the thin steel material 6-1 obtained in this way is cooled is defined as t1, and the time until the thick steel material 6-2 is cooled is defined as t2.

[0060] _{T PL = [{1 / (} T LV +273) 3} + {(6 · ε · σ · t) / φ · ρ (H / 1000)}] -1/3 -273 ...... (3) T _PL : Steel material temperature [° C.] T _LV : Cooling floor inlet side temperature [° C.] t: Elapsed time from the cooling inlet side temperature measurement time to the current time [sec] H: Steel thickness [mm] (variable) ε: Emissivity (adjustment factor) σ: Stefan-Boltzmann coefficient (1.353 × 10
⁻¹¹ kcal / m ² / ° C ⁴ / sec) φ: Specific heat (0.5 kcal / kg / ° C) ρ: Specific gravity (7800 kg / m ³ ) Therefore, based on the above (3), the cooling floor of the thin steel material 6-1 When the elapsed time t1 from the charging to the temperature lower than the allowable temperature and the extraction is performed and the same elapsed time t2 of the thick steel material 6-2 are obtained, the time relationship as shown in FIG. 8 is obtained.

Therefore, after the thin steel material 6-1 is extracted from the cooling bed 5 in advance, the time until the thick steel material 6-2 is extracted, that is, the cooling time tdint until it is cooled is calculated from the following equation. .

Tdint = (t2 + tcint) −t1 (4) tdint: time interval that can be extracted from the cooling floor [sec] tcint: cooling floor charging time interval between the thin steel material 6-1 and the thick steel material 6-2. (Actual value) [sec] t1: Cooling time of thin steel material 6-1 [sec] t2: Cooling time of thick steel material 6-2 [sec] (2) Calculation method of steel material interval L _INT (time difference is converted to distance) When the time interval tdint that can be extracted from the cooling floor is obtained as described above, the number of steel materials charged into the cooling floor 5 during the time interval tdint that can be extracted from the cooling floor Is calculated from the capacity Ton / hour of the heating furnace 1 as follows.

[0063] _{N = T PH / {Ls *} (Hs / 1000) * Bs * (ρ / 1000)} ... (5) N: one hour per slab extraction number TPH: furnace capacity [ton / h] Ls: Standard slab length [m] Hs: standard slab thickness [m] Bs: standard slab width [m] ρ: specific gravity [7800 kg / m ³ ] If the number of slabs extracted per hour N is obtained as described above. , The standard steel material transfer speed V in the cooling floor
Find cool [m / s].

Vcool [m / s] = N * (Bs + LIS) / 6000 (6) LIS: Standard steel material spacing in cooling floor [m] And the standard steel material in cooling floor obtained as described above Transfer speed Vcool and time interval tdint that can be extracted from the cooling floor
Is used to determine the steel material interval LINT [m] by the following equation.

LINT = Vcool * tdint (7) Therefore, according to the above-described embodiment, after calculating the predicted cooling time in accordance with the type of the steel material, for example, the change in the thickness of the steel material, these two different values are obtained. Optimum control of the steel interval in the cooling floor based on the cooling time difference of the steel, the number of steels charged in the cooling floor, and the speed of transporting the steel in the cooling floor. Steel products can be manufactured and the operation can be stabilized.

(Fourth Embodiment) FIGS. 9 to 11 are configuration diagrams showing another embodiment of the steel material transfer system according to the present invention. FIG. 9 is an overall configuration diagram of a steel material transfer line, and FIG.
FIG. 11 is a view for explaining a state of dispensing steel materials in the cooling floor, FIG.
FIG. 2 is a functional configuration diagram of the present invention. Note that FIG.
3 to 15 are denoted by the same reference numerals, and detailed description thereof is omitted. For convenience of description, only the heating furnace 1 and the cooling floor 5 are viewed from above.

In the first to third embodiments, the transfer of the steel material in the cooling floor 5 is performed with the charging priority, but in the present embodiment, the slab 2 is burned in the heating furnace 1. In this example, the priority is changed to the extraction priority when it takes time, and the steel material 6 in the cooling floor 5 is paid out to the refinement line 7.

That is, this steel material transfer system controls the transfer of the steel material transfer equipment 12 from the host computer 11 via the transfer controller 13, and the host computer 11 includes the extraction end slab of the heating furnace 1 as shown in FIG. The slab combustion control unit 31 which grasps the temperature condition of 2 and executes the slab combustion control in the heating furnace, and calculates and outputs an extraction time from the extraction end slab temperature until the extraction end slab of the heating furnace can be extracted. And a mill setting calculation unit 32 for calculating a slab transfer time from the start of heating furnace slab extraction to the inlet of the cooling floor by simulation using information such as rolling speed, and an extraction end output from the slab combustion control unit 31. Receiving the slab temperature or the time at which the slab can be extracted, the steel material 6-1 in the cooling floor extraction port can be paid out to the refinement line 7. At this time, it is checked whether or not the following equation (8) holds. If so, the cooling floor transport setting means 15a sends an extraction command for changing the charging priority mode to the extraction priority mode to the controller 13. Are provided.

Tchg + tROL ≧ tTR1 + (tcol2−tTR1) + tTR2 + tBK2 (8) tchg: time from the present time until the extraction end slab of the heating furnace 1 reaches the extractable temperature tROL: slab conveyance calculated by the mill setting calculation unit 32 Time tTR1: Transport time until the cooling floor extracted end steel material 6-1 is discharged to the refinement line 7 tcol2: Cooling time until the next extracted steel material 6-2 can be discharged at this time tTR2: Steel material 6-2 Transport time till delivery to the refining line 7 tBK2: Transport time for the next charge after the delivery of the steel material 6-2. Therefore, the cooling floor transport setting means 15a satisfies the condition of the above equation (8). When the condition is satisfied, an extraction command in the extraction priority mode is sent to the controller 13. When receiving the extraction command, the controller 13 removes the steel material 6-1 of the cooling floor 5 from FIG.
As shown in FIG. This steel material 6-1
After the dispensing of the cooling floor 5, the steel materials 6-2, 6-3,.

Next, when the temperature of the steel material 6-2 on the cooling floor outlet side can be paid out to the refinement line 7, the same check is performed again using the following conditional expression. Do.

Tchg + tROL ≧ tTR2 + (tcol3−tTR2) + tTR3 + tBK3 (9) tchg: Time from the present time until the extraction end slab of the heating furnace 1 reaches the extractable temperature tROL: Slab transport calculated by the mill setting calculation unit 32 Time tTR2: Conveyance time until cooling floor extracted end steel 6-2 is discharged to refining line 7 tcol3: Cooling time until next extracted steel 6-3 can be discharged at this time tTR3: Steel 6-3 The transfer time tB3: the transfer time for the next charge after the payout of the steel material 6-3. When the above equation (9) is satisfied, the extraction priority mode is continued. Then, the steel material 6-2 is paid out to the refining line 7. After dispensing the steel 6-2, the steel 6-2, 6-6
-3, ... is made to stand by at that position without backing up to the cooling floor inlet.

Thereafter, the above processing is sequentially repeated. However,
When the condition is not satisfied, the following processing is executed.

Tchg + tROL ≧ tTRN + (tcolN + 1−tTRN) + tTRN + 1 + tBKN + 1 (10) tchg + tROL ≧ tTRN + tBKN (11) tchg: Time from the present time until the temperature at which the extraction end slab of the heating furnace 1 can be extracted tROL: Mill calculation section Slab transfer time calculated in 22 tTRN: Transfer time until cooling floor extracted end steel 6-N is discharged to refining line 7 tcolN: Until the next extracted steel 6- (N + 1) can be discharged at this time. Cooling time tTRN + 1: Transport time until the steel 6- (N + 1) is discharged to the refining line 7 tBKN: Transport time for the next charge after discharging the steel 6-N tBKN + 1: Steel 6- (N + 1) )), After the dispensing, the transfer time for the next charging material to face in. That is, when the above formula (10) is not satisfied, the cooling floor 5 of only the steel material 6-N at the extraction end is Whether or not the payout is possible is checked by the above-mentioned equation (11). When the equation (11) is satisfied, the steel material 6-N is put into the refinement line 7
After that, the mode is changed from the extraction priority mode to the charging priority mode. That is, in order to wait for the next charging to the cooling floor 5, the steel material 6 is moved to the cooling floor charging end side of the rolling line.

In this embodiment, the cooperation with the slab combustion control unit 31 of the heating furnace 1 is aimed.
As shown in FIG. 2, a mill down monitoring unit 33 for monitoring troubles on the rolling line, such as oil pressure drop, motor down on the line, etc., and a rolling roll management unit 34 for managing the exchange state of the rolling rolls are provided. Receives the estimated milldown time and the estimated roll change time from the milldown monitoring unit 33 and the roll roll management unit 34, and can change to the extraction priority mode.

The present invention can be variously modified and implemented without departing from the gist thereof.

[0076]

As described above, according to the present invention, it is possible to make maximum use of a coolant as a buffer buffer.
Stable and continuous operation of slabs, steel materials, etc. can be ensured against troubles such as refinement lines.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a steel material transport system according to the present invention.

FIG. 2 is a configuration diagram of a cooling floor as an embodiment of the steel material transport system according to the present invention.

FIG. 3 is a diagram showing an expansion coefficient profile of a rolling roll when a refinement line is normal and when trouble occurs.

FIG. 4 is a view for explaining a state of transport of a steel material in a cooling floor.

FIG. 5 is a diagram showing a state of a steel material in a buffer zone at the time of trouble in the refining line.

FIG. 6 is a configuration diagram showing another embodiment of the steel material transfer system according to the present invention.

FIG. 7 is a configuration diagram showing still another embodiment of the steel material transfer system according to the present invention.

FIG. 8 is a diagram for explaining a time relationship from charging to extraction of a steel material in a cooling floor.

FIG. 9 is a configuration diagram showing still another embodiment of the steel material transfer system according to the present invention.

FIG. 10 is a diagram illustrating a change relationship between the charging priority mode and the extraction priority mode.

FIG. 11 is a functional block diagram showing a configuration inside a host computer in the steel material transport system.

FIG. 12 is a functional block diagram showing a configuration inside a host computer.

FIG. 13 is a configuration diagram of a steel material transfer facility of a general steel material transfer system.

FIG. 14 is a view for explaining a problem when priority is given to extraction of a steel material in a cooling floor.

FIG. 15 is a view for explaining a problem at the time of prioritizing charging of a steel material in a cooling floor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Heating furnace 2 ... Slab 3 ... Rolling line 4 ... Rolling machine 5 ... Cooling floor 6,6-1, 6-2 ... Steel 7 ... Refining line 11 ... Host computer 12 ... Steel material transfer equipment 13 ... Transfer controller 15, 15a ... cooling floor transfer setting means 21 ... buffer zone 31 ... slab combustion control unit 32 ... mill setting calculation unit

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] January 4, 2001 (2001.1.14)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 2

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claim 3

[Correction method] Change

[Correction contents]

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

(2) The slab heated in the heating furnace is rolled in a rolling line, and the rolled rolled steel material is sequentially charged in a cooling floor in a charging priority mode, and transported and cooled in the cooling floor. In the steel material transfer system to be extracted in the refining line, the buffer zone length is determined in consideration of the maximum number of steel materials placed on the rolling line, and the cooling floor outlet is determined based on the determined buffer zone length. and zone length determining means for forming a buffer zone to the side, the steel width on the rolling line, cooling bed outlet side except the buffer zone and the steel material width and the cooling bed in steel intervals after rolling of the heating furnace exit slab Slab extraction suppressing means for extracting the slab to the rolling line while suppressing the slab on the outlet side of the heating furnace in accordance with the magnitude relationship with the empty space.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction contents]

The length X of the buffer zone is determined on the basis of the following equation: X = BMAX * N + LP (N-1) + β. In the above equation, BMAX is the maximum width of the steel material after rolling, LP is the interval between the steel materials in the cooling floor, N is the maximum number of steel materials on the rolling line, and β is the allowance.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0037

[Correction method] Change

[Correction contents]

However, the steel 6 detected by the temperature sensor 22
When the temperature of -1 is higher than the maximum allowable temperature,
1 is left in the buffer zone 21 as it is.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0048

[Correction method] Change

[Correction contents]

X = BMAX * N + LP (N−1) + β (1) X: Buffer zone length BMAX: Maximum width of steel material after rolling LP: Steel material spacing in cooling floor N: Load on rolling line 3 BMAX, N, LP, β are values that can be easily set in the design stage or in the control process by the host computer 11 in advance.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0051

[Correction method] Change

[Correction contents]

The condition for suppressing the slab extraction is that a space is secured to allow the steel 6-1 on the rolling line 3 and the slab 2 on the exit side of the heating furnace 1 to be charged into the cooling floor 5. . For example, the steel material 6-1 is currently on the rolling line 3.
If There resting one, B1 + B2 + LP + α <Y ...... (2) B1: width after the slab 2 rolling B2: width after rolling steel 6-1 LP: steel spacing in the cooling bed 5 alpha: margin Y: Empty space on the exit side of the cooling floor If the relationship is established, an extraction permission signal is sent to the walking beam transfer mechanism, and the slab 11 is extracted from the heating furnace 1 to the rolling line 3. In the above equation, B1, B2, LP,
Y is a value that can be grasped in advance in the design stage or in the process of control by the host computer 11, and α is a value set in advance.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0069

[Correction method] Change

[Correction contents]

Tchg + tROL ≧ tTR1 + (tcol2−tTR1) + tTR2 + tBK2 (8) When tcol2−tTR1 <0, tchg + tROL ≧ tTR1 + tTR2 + tBK2 (8) ′ tchg : The temperature at which the extraction end slab of the heating furnace 1 can be extracted from now. TROL: slab transfer time calculated by the mill setting calculation unit 32 tTR1: transfer time until the cooling floor extracted end steel 6-1 is discharged to the refinement line 7 tcol2: next extracted steel 6-2 at this time TTR2: transport time until the steel material 6-2 is discharged to the refining line 7 tBK2: transport time for the next charge after discharging the steel material 6-2 The cooling-floor transfer setting unit 15a sends an extraction command in the extraction priority mode to the controller 13 when the condition of Expression (8) is satisfied. When receiving the extraction command, the controller 13 removes the steel material 6-1 of the cooling floor 5 from FIG.
As shown in FIG. This steel material 6-1
After the dispensing of the cooling floor 5, the steel materials 6-2, 6-3,.

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0071

[Correction method] Change

[Correction contents]

Tchg + tROL ≧ tTR2 + (tcol3−tTR2) + tTR3 + tBK3 (9) When tcol3−tTR2 <0, tchg + tROL ≧ tTR2 + tTR3 + tBK3 (9) ′ tchg : The temperature at which the extraction end slab of the heating furnace 1 can be extracted from now. Time tROL: slab transfer time calculated by the mill setting calculation unit 32 tTR2: transfer time until the cooling floor extracted end steel 6-2 is discharged to the refinement line 7 tcol3: next extracted steel 6-3 at this time TTR3: transport time until the steel material 6-3 is discharged to the refining line 7 tBK3: transport time for the next charge after discharging the steel material 6-3 When the equation (9) is satisfied, the extraction priority mode is continued, and the steel material 6-2 is paid out to the refinement line 7. After dispensing the steel 6-2, the steel 6-2, 6-6
-3, ... is made to stand by at that position without backing up to the cooling floor inlet.

[Procedure amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0073

[Correction method] Change

[Correction contents]

Tchg + tROL ≧ tTRN + (tcolN + 1−tTRN) + tTRN + 1 + tBKN + 1 (10) When tcolN + 1−tTRN <0, tchg + tROL ≧ tTRN + tTRN + 1 + tBKN + 1... From (10) ′ ttg + tRO to (10) ′ tchg + tRO at the current time TROL: slab transfer time calculated by the mill setting calculation unit 22 tTRN: transfer time until the cooling floor extracted end steel 6-N is discharged to the refinement line 7 tcolN: at this time Then, the cooling time until the next extracted steel material 6- (N + 1) can be dispensed tTRN + 1: the transport time until the steel material 6- (N + 1) is dispensed to the refining line 7 tBKN: After dispensing the steel material 6-N, Transport time for entering the incoming material tBKN + 1: Transport time for entering the next charged material after dispensing the steel material 6- (N + 1) When the expression (10) is not satisfied, it is checked by the expression (11) whether it is possible to discharge only the steel material 6-N at the extraction end from the cooling floor 5. When the equation (11) is satisfied, the steel material 6-N is put into the refinement line 7
After that, the mode is changed from the extraction priority mode to the charging priority mode. That is, in order to wait for the next charging to the cooling floor 5, the steel material 6 is moved to the cooling floor charging end side of the rolling line.

[Procedure amendment 11]

[Document name to be amended] Drawing

[Correction target item name] Figure 3

[Correction method] Change

[Correction contents]

FIG. 3

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Susumu Mukumoto, Inventor 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Fuchu Plant, Toshiba Corporation (72) Inventor Hideho Kobe 1-1-1, Shibaura, Minato-ku, Tokyo Toshiba Head Office F term in the office (reference) 4E024 BB08 BB18

Claims (5)

[Claims] 1. A steel material transporting system in which a rolled steel material is sequentially charged into a cooling floor in a charging priority mode, and is conveyed and cooled in the cooling floor and extracted to a refining line. When the steel material conveyed in the cooling floor is cooled to a predetermined temperature or less, the steel material is extracted into the refining line without being placed in the buffer zone. A steel material transfer system, wherein the steel material is placed in the buffer zone before or when the steel material in the buffer zone is not cooled below a predetermined temperature. 2. A slab heated in a heating furnace is rolled in a rolling line, and the rolled rolled steel material is sequentially charged into a cooling floor in a charging priority mode, and transported and cooled in the cooling floor while being precisely cooled. In the steel material transfer system to be extracted to the conditioning line, a buffer zone length is determined in consideration of the maximum number of steel materials placed on the rolling line, and the cooling floor outlet is determined based on the determined buffer zone length. Zone length determining means for forming a buffer zone on the side, a steel thickness on the rolling line, a steel thickness after rolling of the heating furnace outlet side slab, a cooling floor outlet excluding the steel gap in the cooling floor and the buffer zone. And a slab extraction suppressing means for extracting the slab to the rolling line while suppressing the slab on the outlet side of the heating furnace according to the magnitude relationship with the empty space on the side of the steel material. 3. The steel transport system according to claim 1, wherein the length X of the buffer zone is determined based on the following arithmetic expression. X = BMAX * N + LP (N-1) + β, where BMAX: Maximum thickness of steel material after rolling LP: Spacing of steel material in cooling floor N: Maximum number of steel materials on rolling line β: Extra margin 4. A steel material transfer system in which a rolled steel material is sequentially charged into a cooling floor in a charging priority mode, and is conveyed and cooled in the cooling floor and extracted to a refining line. A cooling time calculating means for substituting an allowable temperature or the like which can be extracted into the refinement line, and calculating a cooling time until a different type of steel material is charged into the cooling line after being charged into the cooling floor; After the extraction of one type of steel material, predict the cooling time until the other type of steel material to follow goes below the allowable temperature,
Using the number of steel materials to be charged into the cooling floor within the predicted cooling time and the steel material transport speed in the cooling floor, a steel material interval calculating means for calculating an interval between the different types of steel materials. Characterized steel material transport system. 5. A slab heated in a heating furnace is rolled in a rolling line, and the rolled rolled steel material is sequentially charged in a cooling floor in a charging priority mode, and conveyed and cooled in the cooling floor while being precisely cooled. Means for calculating a slab extraction time from the slab temperature on the exit side of the heating furnace to the slab extraction temperature; and Mill calculating means for calculating the time until, when the cooling floor exit side steel material reaches a temperature that can be extracted to the refining line, the time addition value calculated by the two means and the refining from the cooling floor The cooling floor which compares the extraction related time to be paid out to the line, changes the charging priority mode to the extraction priority mode when the latter time is small, and sends an instruction to extract the cooling floor discharge side steel material to the refinement line. Transport A steel material transport system comprising a setting means.