JPS6096711A - Operation of walking beam - Google Patents

Abstract

PURPOSE:To make a heat shielding plate smaller and to minimize heat loss at the opening of a hearth by a method in which a walking beam stops approximately at the center of forwarding and backwarding stroke in a metal heating furnace, etc. CONSTITUTION:Walking beam 1 goes up and down, and moves forward and backward, and carries materials to be heated 6 to heat them in the heating furnace. At this time, the stop position 8 of the beam 1 is set at the lowest limit and the center of said stroke. From this stop position, the beam 1 is moved backward and ascended to the upper limit. After moving it forward, it is descended to the lowest limit. Then, after moving it backward, it is stopped at the stop position 8. By adjusting the position 8 of the beam 1, the heat shielding plate 7 fitted on the bottom of opening 3 of the beam 1 can be made smaller. As the opening 3 can be shut off by the smaller plate 7 while a standstill, the heat loss minimizes, resulting in energy saving.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of operating a walking beam in a metal heating furnace.

In the metal heating furnace 'C, materials to be heated such as steel and other metals are transferred while being heated on a water-cooled skid pipe using a walking beam.

As shown in Fig. 1, the conventional walking beam has a corner-shaped A-each leg of the king beam a has an opening 1'' part d of the hearth C.
A heat shielding plate e that is approximately the same size or smaller than the opening d is provided on the lower surface side of the hearth C of each leg stool.

In the figure, f is a skid rail, g is a heated material, h is seal water, and i is a gas seal.

As shown in Fig. 2, the walking beam a rises from the stop position j to the upper limit within the opening d, then moves forward (or rightward), then descends F to the lower limit, and then moves right (or curves). The cyclic motion of moving forward) and stopping at the rightward end (or forward end) is repeated at regular intervals. Here, opening d+7) large width 200 to 4ooIIllI11
Length L8o.

~1200 mm, the stroke of the walking beam a is less than the length L of the opening d, and the vertical movement is 15 mm.
It is about 0 to 300Il1m.

The size of the heat shield plate e should be long enough to block the opening d no matter where it is located during the stroke of the king beam a. If the plate e is made longer, the distance between the gas seals i must be increased accordingly.

However, if the interval between the gas seals i is widened, it becomes impossible to attach a beam to the hearth C, so the length of the heat shield plate e is limited and must be at most the same as above or shorter.

Therefore, when the stopping position of the walking beam a is at the front or right end of the forward rightward stroke, the heat shielding plate e prevents the opening d in FIG. Range shown (usually 200-500+
(u) could not be shut off, and the stopped state of the walking beam (a) accounted for 70 to 95% of the total operating time, resulting in extremely large heat loss.

In addition, as shown in FIG. 3, in order to avoid the restriction that the gas seal i is attached to the mounting position of the gas seal i, a heat shield plate e' is provided on the upper surface side of the hearth C at the penetrating portion of the walking beam a. There is a method in which the length of e' is increased by a length of !' on the opposite side of the stop position j to prevent a decrease in heat loss when the walking beam a is stopped.

However, in this case, the shielding plate e' is exposed to the high temperature gas in the heating furnace, while there is a limit to the cooling effect of the cooling water passing through the walking beam a. Since the length 1' of the heat shield plate e' is not sufficiently cooled, even the heat shield plate e' made of heat-resistant steel had an extremely short lifespan. Furthermore, when the portion 1' returns to the stop position after being exposed to high temperature, the area from which heat is radiated toward the sealing water tank increases, resulting in large heat loss.

The present invention was made for the purpose of eliminating the above-mentioned drawbacks of the conventional walking beam, and by setting the stopping position of the walking beam approximately at the center of the forward and rightward stroke, the heat shield plate can be made smaller, and the hearth opening can be reduced. This invention relates to a method of operating a walking beam that can minimize heat loss.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 is a diagram showing an example of a walking beam for carrying out the method of the present invention, and 1 is a walking beam;
2 is a hearth, 3 is an opening, 4 is seal water, 5 is a gas seal, and 6 is a heated material. A heat shielding plate 7 is provided on the lower surface side of the opening 3 of the penetrating portion of the walking beam 1, and the length of the heat shielding plate 1 is made longer than the length of the opening 3. For example, when the walking beam 1 is located at the center of the front and back stroke, the overlap S between the hearth 2 and the heat shield plate 7 is set to be 30 to 50 m.

In the above description, the means for stopping the walking beam 1 at the center of the forward and rightward stroke is not shown, but it can be done by adjusting the walking beam stop position of the walking beam drive system.

As shown in FIG. 5, the walking beam 1 moves the material to be heated 6 by, for example, vertically moving up and down by 150 to 300 em 1 fIm and horizontally moving forward and to the right by about 100 to 800 g 1 m. Thereby, the material to be heated 6 is heated to 1100 to 1200°C in the heating furnace. That is, as shown in FIG. 5, the stopping position 8 of the walking beam 1 is the lowering limit of the walking beam 1 and the center of the forward right stroke, and the walking beam 1 is set at the stopping position 8.
It moves to the right from then on, then rises to the upper limit, and after moving forward, lowers to the lower limit, moves to the right to stop position 8, and stops.

This one cycle of movement takes approximately 40 to 60 seconds, and one cycle is repeated at fixed time intervals.

The above operation may be started by setting the stop position as the center of the forward and right stroke of the upward limit, and moving the robot forward from the stop position.

Therefore, while the walking beam 1 is stopped, the walking beam 1 is located at the center of the forward rightward stroke at either the lower limit or the upper limit, so the heat shield plate 7 provided on the walking beam 1 overlaps the hearth 2, so the heat shielding plate 7 closes the opening 81S3, blocking high-temperature radiant heat inside the heating furnace from escaping into the seal water 4 from the opening 3 and preventing high-temperature gas from leaking out of the furnace. It is possible.

Further, the length of the heat shield plate 1 may be the length of the opening 3 plus the overlap margin sx2, so it can be made smaller than the conventional example shown in FIG. 3. Therefore, the cooling effect of the cooling water flowing in the walking beam 1 reaches every corner of the heat shield plate 1, and the life of the heat shield plate 7 is extended without overheating. Therefore, instead of attaching the heat shield plate to the lower side of the hearth, it can also be attached to the upper side of the hearth.

It should be noted that the walking beam operating method of the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

As described above, the walking beam operating method of the present invention exhibits various excellent effects as described below.

(1) The walking beam has the longest state time (
Since the stop position (70 to 95% of the total) is set approximately at the center of the forward and rightward (horizontal movement) stroke, the size of the heat shield plate can be minimized.

(ii) Because of the above (υ), the heat 111 parts of the heat shielding plate becomes smaller, and its life becomes longer.

(To) A small heat shield plate blocks the hearth opening during stoppage, which minimizes heat loss and is extremely effective in terms of energy conservation.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of an example of a conventional walking beam, Fig. 2 is an explanatory diagram of the operating method of the walking beam shown in Fig. 1, and Fig. 3 is an explanatory diagram of another example of the conventional walking beam. FIG. 4 is an explanatory diagram of a walking beam used to implement the method of the present invention, and FIG. 5 is a detailed explanatory diagram of the present invention. 1 is a walking beam, 2 is a hearth, 3 is an opening, 7 is a heat shield plate, and 8 is a stop position. Figure 1 Figure 3 Figure 4 Figure 5 Continuation of page 1 0 Author: Yoshiyuki Nakatani, Kanazawa-cho, Kakogawa City, 0 author: Fumi Tomi, Kanazawa-cho, Kakogawa City, 0 author: Takao Mine, Kakogawa City 0 inventors in Kanazawa Town 1) Seconded to Hinodemitsu Iwakuni Saturday and Sunday 1
Koji Kobe Steel, Ltd. Kakogawa Works No. 2-1 Iwakuni Works, Ltd.

Claims (1)

[Claims] 1) Operation of a walking beam characterized in that the stopping position of the walking beam provided with a heat shield plate for blocking the frontage of the hearth of the metal heating furnace is set at approximately the center position of the forward and rightward stroke of the walking beam. Method.