JPS5935616A - Continuous heating furnace - Google Patents

Abstract

PURPOSE:To reconcile the difference in treatment capacity between a continuous casting stage and a rolling stage and to minimize installation and running costs by providing a charger which controls the charging stroke into a heating furnace in front of the furnace. CONSTITUTION:Materials 9 to be heated are fed to the front face of a heating furnace 1 by a charging roll table 8. The materials 9 are then charged into the furnace 1 by a matching charger 2 constituted of a rack 2, a pinion 3, a ram 4, a hydraulic cylinder 5, a driving lever 6 and a guide roll 7. The stroke SMC of the charger 2 is maintained at the value calculated by the equation (Ss; the reference stroke of the charger, Swb, walking beam stroke, N; the number of the materials which are already charged into the furnace and are extracted until the (n)-the piece is charged, Swb; the error in the walking beam stroke). The materials 9 charged into the furnace 1 are conveyed in the furnace 1 by means of stationary and movable skids 10, 11 and are thus extracted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating furnace located between a continuous casting process and a rolling process that minimizes equipment costs and running costs and absorbs the difference in throughput between the two processes.

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 as much as possible. .

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. Also, from a thermoeconomic perspective, the occupancy rate of one hearth of the heated material is high;
It is desired to have the minimum furnace length that provides the required amount of heat and to reduce equipment costs. For this reason, it has recently been proposed to make the heating furnace a split hearth type. Although this split hearth furnace has advantages, it also has problems.

In other words, a hearth split type heating furnace functions well when the same number of heated material groups are operated at a constant charging and extraction pitch, but this condition does not always continue. Naturally, the number of heated material groups, charging pitch, and extraction pitch often vary depending on the equipment specifications, steel type, and production volume.

In the conventional prior art, for example, there is a method of absorbing the unmatching operation between continuous casting and rolling by using a three-part furnace type heating furnace as shown in Fig. 1. , (ro), (ha) and (ni).

(a) When the heat-receiving materials 9 are sequentially charged, they are connected by a connecting mechanism, and the divided walking beams A, B, and C are synchronously driven [FIG. 1(a)].

(When the 0-hole heated material group 9 is transferred from walking beam A and moved to walking beams B and C, A is disconnected from B and C, and A is connected to B.

Independent driving is possible separately from C [Figure 1 (ro)].

(c) The walking beam A moves the newly charged material to be heated 9, and the walking beams B and C sequentially extract the group of previously charged materials to be heated 91 [FIG. 1(a)].

(d) As shown in FIG. 1(d), when the walking beams are removed from the heated material 91, the walking beams B and C are separated, C is driven individually for extraction, and A and B are synchronized and transported into the furnace.

However, the above-mentioned movement is only possible when the walking beam B is empty, and depending on the throughput and the charging time pitch of the heated material groups 9 and 91, the effect of the split hearth cannot be achieved. . That is, in the state shown in FIG. 1(a), the heated material 9 must continue to wait in the walking beam A until the walking beam B becomes empty. Moreover, -
Once the casting time is increased, the pitch of the CC (continuous casting machine) is a fixed time, which makes it even more difficult to use a split hearth.

Furthermore, when driving a split hearth independently, an empty space in which no heated material is placed within the range of walking beams 1 to 1, that is, an ineffective furnace length is required, which increases the total furnace length and increases equipment costs. The fuel consumption rate increases due to an increase in heat dissipated from the body.

Furthermore, although the charging of the heated material is continuous, in the case of an operation in which the charging and extraction pitches are different, the heated materials cannot be arranged at equal intervals in the furnace, resulting in a so-called "missing state". Such a situation cannot be corrected to equal pitch even in the split hearth type, and there is a problem that the hearth occupancy rate of the heated material decreases and the fuel consumption rate increases.

The present invention provides a heating furnace disposed between a continuous casting process and a rolling process, in which a matching charger is provided in front of the heating furnace to adjust the furnace-internal shaft 1 to the rotor, thereby reducing the processing capacity difference between the two processes. In addition to absorbing the The extraction of teeth in this process has the following characteristics: there is no state and the hearth occupancy rate of the heated material is high.

An embodiment of the present invention will be described below.

FIGS. 2(a), 2(b), and 3 show the present invention, in which the heating furnace 1 is arranged as a buffer zone between the continuous casting process and the rolling process to absorb the difference in capacity between them. 2 in FIG. 3 is a matching charger, and the matching charger 2 includes a rack 3, a pinion 31 and a ram 4.
1, and a hydraulic cylinder 5. It consists of a drive lever 6 and a guide roller. The material 19 sent to the front of the heating furnace lΦ by the charging roller table 8 is transferred to the front of the heating furnace l.
The materials IO are lowered into the furnace, cleared by a fixed skid 10, and sequentially advanced through the furnace by an in-furnace movable skid 11.

In the heating furnace of the present invention, each time the material to be heated 10 is charged, the formula S
The heating furnace is operated with a stroke SMC calculated by MC = Ss + Swb (N-n) + ΔSwb, and is equipped with a charger 2 in front of the heating furnace for charging the heated material lO into the heating furnace 1. Figure 2 (I), (
(Ro) will explain.

A. The material to be heated (A) is extracted from the inside of the furnace onto the extraction table 12.

B. After 411 hours (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 (c) charged in the C0 furnace is grasped, and the stroke amount of charger 2 is Sr, +Sw.
It is calculated by the formula b(N-n)+ΔSwb.

D. Operate the charger 2 with the calculated stroke amount and charge the material (b) into the furnace (port 1).

E. The material (port 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 material lO is indicated by (a) to (1-),
The charging port is indicated by 12, and the extraction port is indicated by 13.

The heat-receiving material (g) is extracted from the extraction port 13 for 12 hours, and the heat-receiving material (b) to (f) in the furnace is passed through the walking beam step 1.
~ Roku is transferred from the loading side to the extraction side. Now the heated material (a) has moved to the position (b), leaving the position (a) in place. After t1 hours, the material to be heated (H) is sent to the front of the furnace and placed in the position (A).

Next, after 2×12 hours, the heated material (H) is extracted, and (J) moves to the position (C), and at this point, the positions (A) and (B) are still in place. The heated material was sent in this condition.
In order to prevent tooth extraction inside the furnace, the stroke amount of the charger should be increased to reach position (b). 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 heated material charged, and removes the state of the heated material in the furnace, and this stroke amount is calculated as follows. It is expressed by the formula.

SMC=Ss+ (N-n)Swb+ΔSwb where,
S 20th 0 Charging material dozen 1 - Roke Ss 2nd standard stroke Swb: Walking beam stroke ΔSwb: Walking beam stroke error N: Already in the furnace, extracted before n main ports are charged For example, in Figure 4, the number of strokes extracted is n = 3, and the extracted number N is 5.

5i=3=Ss+(5-3)Sub+ΔS%1b=Ss
+2Svb+ΔSvb.

A specific example of the operation of the matching charger of the heating furnace of the present invention will be explained. For example, the movement of the heated material matching charger in the case where the charging pitch on the charging port side is 2.26 minutes, the extraction pitch on the extraction port side is 1.57 minutes, and the number of rolls rolled at one time is 31 is as follows. Shown in the figure.

■31 heated materials are charged into the furnace.

(1) 31 heated materials are extracted in 1.57 minutes, and at the same time all the heated materials in the furnace move to the extraction port 13 side.

After 02.26 minutes, the material to be heated arrives in front of the furnace and is loaded into the furnace at the lot position by the matching charger. At this time, the stroke of the charger is S'I' ] 01.

■By repeating the same movement, the materials to be heated that arrive at the front of the furnace are sequentially charged into the furnace at equal intervals, regardless of the extraction pitch.

■After 48.67 minutes have passed and 31 rolls have been extracted, there will be a waiting time of 21°33 minutes in the furnace due to reasons such as changing rolls in the rolling process, but during this time the heated material will be heated at intervals of 2°26 minutes. It is sent to the front of the furnace and then charged into the furnace.

■Under these conditions, the stroke of the charger gradually increases from the heated material 101 to the heated material 122,
After the heated material 123, the stroke becomes smaller due to the extraction waiting time, and when extraction starts, the charger operation is repeated so that the stroke becomes larger again, thereby reducing the difference in capacity between the continuous casting process and the rolling process. It becomes possible to absorb it.

Further, in the present invention, for example, when trouble occurs in the continuous casting equipment and during transportation, a situation may occur in which a large number of heated materials are sent to the front of the furnace and the heated materials are left on standby outside the furnace. In this case, it is desirable to charge the heated material into the furnace quickly to prevent heat radiation from the heated material.

In order to deal with this situation, in the present invention, it is also possible to make the hearth divided into two parts, a charging side walking beam 11 and an extraction side walking beam 111, as shown in FIG. In this case, the walking beam frames 14, 14 .
are connected by a coupler 17, and a walking beam 1.1,1 is connected by a cylinder 15 for forward and backward movement and a cylinder 16 for vertical movement.
11 can be operated simultaneously or individually. Then, regardless of the extraction side walking beam [11], the nine groups of materials to be heated are charged into the furnace by the matching charger 2 and the charging side walking beam 11, and in normal operation, both walking beams 11 and 111 are connected to the coupler 17. This makes it possible to install them in series and perform synchronized operation.

As described below, in the present invention, the heating furnace disposed between the continuous casting process and the rolling process is equipped with a matching charger that adjusts and operates the furnace inlet strokes 1 to 1, so that the transition between the two processes is achieved. The effects of the present invention are remarkable, such as absorbing the difference in processing capacity, increasing the hearth occupancy rate, improving thermal efficiency, and minimizing running costs for heating furnace equipment.

[Brief explanation of drawings]

(i), (ro), (a), and (ni) in Fig. 1 are an explanatory diagram of the operation of the three-part hearth, and (i) in Fig. 2 is a plan view of an embodiment of the present invention. (b) is a side view of one embodiment of the present invention, and FIG. 3 is a longitudinal sectional view of one embodiment of the present invention. FIG. 4 is an explanatory diagram showing charging and extraction states in an embodiment of the present invention, and FIG. 5 is an explanatory diagram showing charging and extraction states in further detail in an embodiment of the present invention. FIG. 6 is a longitudinal sectional view of another embodiment of the present invention. ■ = Heating furnace 2: Matching charger 3 = Rack 31: Pinion 41: Ram 5: Hydraulic cylinder 6: Drive lever 7; Guide roller 8: Charging roller table 9.91: Heated material group 10: Fixed skid 11: Movable skid 12: Extraction table 14: Walking beam frame 15: Cylinder for forward and backward movement 16: Cylinder for up and down 17: Connector 5h1 Figure (I) $1) Eye (ni) [; (61)

Claims (1)

[Scope of Claims] A continuous heating furnace disposed between a continuous casting process and a rolling process, comprising a charger for charging the material to be heated into the heating furnace with a stroke SMC calculated by the following equation. Continuous heating furnace; SMC=Ss +Swb(N-n) +ΔSwb, where Ss: standard stroke of the charger. Swb: Walking Beams l-loaf. N: The number of heated materials that have already been charged into the furnace and are extracted at r when n main ports are charged, and ΔSwb: Walking beam stroke error.