JPS5996223A - Continuous heating furnace - Google Patents

Abstract

PURPOSE:To eliminate the drop-out of the material to be heated in a furnace by calculating the stroke amt. of a charger from the distribution of the material to be heated in the furnace for each of the material charged into the furnace and operating the furnace. CONSTITUTION:A hearth WB3 disposed on the discharge side in a continuous heating furnace is connected to driving devices 28, 30 which move vertically and longitudinally on said hearth. On the other hand, the other two hearths WB1, WB2 are connected with a connector 31 and are connected to a common longitudinal driving device 29, and the two hearths WB1, WB2 are connected and disposed to respectively separate vertical driving devices 26, 27. A charger 12 which operates at the stroke SMC calculated by the equation to charge a material 19 to be heated into the furnace 11 at every charging of the material 19 is provided in front of the furnace 11 on the charging side thereof. In the equation, Ss: the standard stroke of the charger, Swb: walking beam stroke, N: the number of the material to be heated charged already into the furnace, DELTASwb: an error in the walking beam stroke.

Description

Detailed Description of the Invention The present invention provides a heating furnace between the continuous casting process and the rolling process, which absorbs the difference in throughput between the two processes, and further eliminates charging or extraction due to 1-rubble generated in both processes. The present invention relates to a heating furnace that minimizes the effects of waiting.

There is a big difference in processing speed between continuous casting equipment and rolling equipment. Therefore, the heating furnace placed between the two processes is required to act as a buffer zone to absorb the difference in processing capacity.

That is, it is desirable to be able to continuously charge the heat-receiving material sent from the continuous casting equipment into the furnace without dissipating the heat it possesses while extracting the heat-receiving material to the rolling line. As a measure against this problem, Japanese Patent Publication No. 57-27761 discloses a three-part hearth heating furnace.

Although this three-part hearth heating seems to have the intended advantages, it has the following problems in actual operation. A specific example will be described with reference to FIG. 6: (a) Charge 1 reaches the front of the furnace, WI 31 is independently driven in accordance with the charging pitch, and charges it into the furnace.

transport.

(b) Charge 1 is synchronously linked to WBI and WB2,
The rice is transported to the center of the furnace. After charge 1 is transferred to space 2, WB, 1 is independently driven in accordance with the charging pitch, and charge 2 is charged and transported into the furnace. Charge 1 at the same time
is WB2. It is transported to the furnace extraction side in accordance with the extraction pitch by the synchronous interlocking drive of WB3, and transferred to space 3.

(c) Charge 2 is transported to the center of the furnace by synchronously interlocking driving of WBI and WB2. After the charge 2 is transferred to the space 2, the WBI is independently driven in accordance with the charging pitch, and the charge 3 is charged and transported into the furnace. At the same time, charge 1 and charge 2 are driven in synchronization with WB2 and WB3,
Charge 1, which is transported in accordance with the extraction pitch and is in space 3, is extracted outside the furnace, that is, into the rolling line, and is transferred to space 2.
The charge 2 in the space is transported to the furnace extraction side and transferred to the space 3.

(d) The same movement as in (c) above is carried out, and charge 2 is extracted to the outside of the furnace, and charge 4 is located in space 1 and charge 3 is located in space 3.

(E) Short-time rolling equipment 1-Rubble occurred and the equipment was in a state of waiting for extraction. Since space 2 is an empty space, WBI and WB2 are driven synchronously and interlocked without being affected by the ``2'' rubble, and charge 4 is sent to the center of the furnace. The charge 4 transferred to the space 2 and the charge 3 in the space 3 wait at that position until 1-rub recovery, and when it becomes possible to roll, they are transferred into the furnace and extracted. charge 5
Since W B 1 can be driven independently, the materials can be charged and transported into the furnace in accordance with the charging pitch without being affected by any trouble.

(F) There was a problem with the rolling equipment that lasted for a long time, and we were in a state where we were waiting for one charge to be extracted. First, WBI and WB2 are synchronously connected aFII IJ, and charge 5 in the space is transported to the center of the furnace. After Charge 5 transfers to Space 2, Charge 6 is charged into the furnace and transported by independent drive of the WBI, but Charge 5 and Charge 4 wait in Space 2 and Space 3. Therefore, at this point, there are three tanks in the furnace.

(1.) The rolling equipment trouble was resolved and extraction became possible. Charge 5 in space 2 and charge 4 in space 3 are transported into the furnace and extracted by synchronous continuous driving of WB2 and WB3. However, charge 6 in space 1 cannot be transported into the furnace and has to wait in space 1. This is because even if WBI is driven in synchronization with WB2.3 and transported inside the furnace, it has to match the extraction pitch and there will be a difference with the charging pitch. This will result in inappropriate charging arrangement, which will have a negative impact on subsequent operations. Therefore, in this case, it is not possible to charge one charge in one charge.

(H)] Space 2 because it is not possible to charge separately
becomes an empty space and the same movement as (c) can be made.

(S) There was a problem with the continuous casting equipment, and the product was in a state of waiting for charging. In this case, basically, the same movement as in (c) is performed, and charge 6, which is unaffected by the trouble and is in space 3, is extracted and charge 7 is transported to space 2.
is transported to the furnace extraction side, and charge 8 is charged and transported into the furnace after troubles 1 to 1 are resolved.

As described in more detail below, the problem lies in the condition (1-), that is, the inability to charge one layer into one.

The purpose of the present invention is to solve this problem, and a continuous heating furnace with a three-part hearth is installed between the continuous casting process and the rolling process. The vertical drive devices are independent, and the forward and backward drive devices are independent for one hearth, and the other two hearths are connected to each other by a coupler to form a common drive device. In the present invention, by disposing a matching charger in front of the charging side furnace of the four-component heating furnace to adjust the in-furnace input stage 1 to loke, the transition between continuous casting and rolling can be achieved. In addition to absorbing processing capacity differences, it is possible to minimize the adverse effects of 1-rubble occurring in each process. Furthermore, we eliminate the need for hot pieces sent from the casting process to wait outside the furnace, eliminate tooth-like conditions inside the furnace, and increase the hearth occupancy rate of heated materials, improving not only fuel consumption but also operational freedom. The purpose is to

An embodiment of the present invention will be described below.

2a, 2b and 3 illustrate the present invention, in which a heating furnace 1 is placed between a continuous casting process and a rolling process as a buffer zone to absorb the difference in performance between them. 12 in FIG. 3 is a matching charger, and the matching charger 12 is connected to a rack 13. pinion 131 and ram 14, and hydraulic cylinder 15. It is composed of a drive lever 16 and a guide roller 17. The material 19 that has been fed to the front of the heating furnace 11 by the charging roller table 18 is lowered into the heating furnace 11 and placed on the fixed skid 20.
The materials 19 are sequentially advanced through the furnace by an in-furnace movable skid 21.

In the heating furnace of the present invention, each time the heated material 19 is charged, the formula S
The heated material 19 is moved into the heating furnace 1 by operating the stroke SMC calculated by MC=Ss+Swb(N-n')+Δ5tyb.
This heating furnace is equipped with a charger 12 to be charged into the heating furnace at the front of the material charging side of the heating furnace, and its basic heating will be explained with reference to FIGS. 2a and 2b.

8. The heat target (a) is extracted from the inside of the furnace using the extraction table 22.

B. After Δt1 time (the difference between the extraction pitch and the charging pitch), the material to be heated (B) is sent to the front of the furnace.

The position of the last material ()8) charged in the C0 furnace is grasped, and the stroke SMC of the charger 12 is Ss.
+Swb(N-n)+ΔSwb formula? It will be counted.

D. Operate the charger 12 at the calculated stroke amount and charge the material (b) into the furnace (port 1).

E. The material (portion 1) is transported into the furnace together with other materials to be heated in accordance with the extraction pitch.

The details of the heating furnace in the present invention will be explained in detail with reference to FIG.

In FIG. 4, the heated materials 19 are indicated by (a) to (1-),
The charging port is indicated by 32, and the extraction port is indicated by 33.

After t2 hours, the heated material (1-) is extracted from the extraction port 33,
The materials in the furnace are transferred from the loading side of the walking beam to the extraction side. Now, the box material (a) is moved to the position of (b), and (a)
The position is set. After 11 hours, the material to be heated (H) is sent to the front of the furnace and placed in the position shown in (A).

Next, after 2 hours of 2Xt, the heated material (H) is extracted, and (H) moves to the position of (B). Further, after 3×12 hours, (e) is extracted and (ch) moves to position (c), and at this point, positions (a) and (b) are still in place. The material to be heated that is sent in this state is charged into the position (b) with the charger's s1 to rotor enlarged so as not to cause tooth-like conditions in the furnace. After 5×t2 hours, (c) is extracted,
(S) comes in the position of (D). At this time, the (nu) sent to the front of the furnace is charged to the position (c) by the charger.

In other words, the present invention calculates the charger stroke amount from the distribution of the heated material in the furnace for each charged material, and eliminates the state of the heated material in the furnace. The amount of loss is expressed by the following formula, I.

SMC=Ss+ (N - Ding+) S sister+
ΔSb Here, SMC: Charger stroke Ss of charging material with n grains Two reference strokes Swb Ni Walking beams 1-roke ΔSwb: Walking beam stroke error 1q: Charging material with n grains already in the furnace and charged For example, in Fig. 4, the number of strokes extracted so far is n = 3. The number of strokes extracted is 5, and Sj, -x = Ss + (53) Swb + Δ5tvb =
S s+ 2 S−wb+ΔSwb.

Next, if a trouble occurs in the continuous casting equipment or the rolling equipment while both the continuous casting equipment or the rolling equipment is in operation,
Waiting for charging or extraction. In this case, it is most desirable to have equipment that allows continuous extraction or charging without affecting the occurrence of I-rubble.

Anticipating such 1-rubble, we added buffer i to the heating furnace.
If you want to make the furnace more functional, you will naturally have to operate it with empty space inside the furnace.

Here, a specific example of operation using the split hearth of the present invention will be explained with reference to FIGS. 1 and 5.

(a) Charge 1 reaches the front of the furnace, WBI and WB2 are driven according to the charging pitch, and charged into the furnace.

transported.

(b) After Charge 1 transfers to Space 2, WBI,
W, B2, and WB3 are synchronously driven in accordance with the charging pitch. Jr charge 2 is charged into the furnace, and charge 1 is transferred to the extraction side and transferred to space 3.

(c) W'B 1 , WB 2 and WB3 are synchronously driven in accordance with the extraction pitch, and the charge 3 is charged into the furnace at a charging pitch different from the extraction pitch. Charge 3 is charged by taking advantage of the characteristics of the matching charger 12 mentioned above.
Transported into the furnace. When charge 1 is completely extracted to the rolling line, an extraction waiting time occurs due to the difference in charging and extraction pitch. Utilizing this time, charge 2 located in space 2 is transported to the furnace extraction side and transferred to space 3. In other words, lower WI3! ;WBI, W while still in the state of &
B2 and WB3 are driven in synchronization. On the other hand, since the WBI of the charge 3 is in a downward state in the matching charger 12, the charge 3 is loaded into a predetermined position without being involved in the movement of the WB at all.

(d) Performing the same movement as in (c) above, charge 2 is extracted to the outside of the furnace, and charge 4 is located in space 1 and charge 3 is located in space 3.

(e)) A problem occurred with the EL dark time rolling equipment, and the product was in a state of waiting for extraction. Charge 3 in space 3 is W
B3 stops and waits at that position until the trouble is resolved.

Charge 4 and Charge 5 in space 1 are WBI
, WB2 and matching charger 12 allow charging without being affected by the above troubles.

Transported into the furnace. Then, as soon as Charge 3 completes extraction, leave WBI in the descending state and change to WBL.

WB2 and WB3 are driven synchronously and Charge 4 is transferred to Space 3.

(F) There was a problem with the rolling equipment that lasted for a long time, and we were in a state where we were waiting for one charge to be extracted. Charge 4 remains in space 3 and waits inside the furnace. Charge 5 and charge 6 in space 1 are charged and transported into the furnace by WBI, WB2 and matching charger 12. However, charge 5
Since Charge 4 is in Space 3, it will be located in Space 2. Therefore, at this point, there are 3
This means that a portion of the map will be located.

(1~) Rolling equipment 1 - Rubble was resolved and extraction became possible. WBI, WB2 and WB3 are synchronously driven in accordance with the extraction pitch, and charge 7 is matched to matching charger 1.
2 allows charging without waiting outside the furnace. That is,
This is because the characteristics of the matching charger 12, which absorbs the difference in loading and unloading pitches regardless of the movement of the WB, are not fully utilized.

Therefore, even if there is a waiting time for extraction of one charge (to), Charge 7 is loaded, Charge 6 and Charge 5 are
Space 2 each. Located in space 3.

(H) Continuously extracting the charge 5 in the same manner as in (1-) above.

Charge 8 is charged.

(S) Continuous casting film (lfit I-Rubble has occurred and it is in a state of waiting for charging. Charge 6 in space 3 is extracted to the rolling line by driving in accordance with the extraction pitch of WB3. Space 2 The charge 7 in the space 1 and the charge 8 in the space 1 wait at that position until the charge 9 arrives, and when the charge 9 arrives, they are charged, extracted, and transported into the furnace in the same manner as in (h).

As described above in detail, the present invention makes it possible to minimize the influence of l-rubble generated in the preceding and preceding steps during charging or extraction waiting, and the effects of the present invention are remarkable.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of the present invention, FIG. 2a is a plan view, FIG. 2b is a side view, and FIG. 3 is a longitudinal sectional view showing a part in detail. FIG. 4 is a time chart 1 showing the charging and extracting operation timings of the matching charger according to an embodiment of the present invention. FIG. 5 shows charging and conveyance within the furnace in an embodiment of the present invention. Time charts 1 to 6, which show the timing of extraction, and time chart 1-, which do not show the conventional timings of charging, conveyance in the furnace, and extraction. 11: Heating furnace 12: Matching charger 13 Nirak 131: Pinion 14: Ram 1
5: Hydraulic cylinder 16: Drive lever 17: Guide roller 18: Charging roller table 19: Heated moon group 20: Fixed skid 21: Movable skid 22: Extraction roller table WBI to WI33: Hearth 23: W+31 walking beam frame 24 :W
B2's walking beam frame 25 2 W'B3's walking beam frame 26: WBl's vertical movement drive device 27: WB2's vertical movement drive device 28: WB3's 2 fixed movement drive device 29: WBl, 2 common forward and backward movement drive device 30: WB3 forward/backward drive device 31: WBl and W132 coupler 32: Charging port 33: Extraction port Patent applicant Nippon Steel Corporation

Claims (1)

[Scope of Claims] In a continuous heating furnace with a three-part hearth located between a continuous casting process and a rolling process, a single drive device that moves the hearth located on the extraction side of the furnace up and down and back and forth. A heating furnace in which the other two hearths are connected to each other by a coupler and connected to a common forward and backward drive device, and each of the two hearths is connected to a separate vertical drive device. A continuous heating furnace in which a charger is disposed before the charging side of the furnace to charge the material to be heated into the heating furnace by operating at a stroke SMC calculated by the following formula each time the material to be heated is charged. SMC=S's+Swb(N-n)+Δ
5tyb However, SS: Standard stroke of the charger. Swb: Walking Beams 1-Loaf. N: Number of heated materials that have already been charged into the furnace and extracted before n main ports are charged, and Δ5iib: Walking beam 1-loaf error.