JPH07294153A - Vibration applying method for hearth - Google Patents

Abstract

PURPOSE:To provide a method for applying a stamping material by which the stamp material can be applied to the hearth of an electric or the like with good efficiency, and the durability of an internal insulating material and a work environment can be improved. CONSTITUTION:A plurality of pressure plates 4 and 4' having vibrators 5 and 5' attached are suspended from a balance rod 3 and a stamp material is applied under vibration while they are sequentially moved, so that the stamping material can be rapidly and uniformly applied, the number of mandays can be reduced and the durability of an internal insulation can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for applying a dry stamp material to the hearth of an electric furnace for steelmaking.

[0002]

2. Description of the Related Art Conventionally, a small device having a tapping rammer and a high-frequency vibrator has been used for constructing a dry stamp material on the hearth of an electric furnace, which requires a lot of manpower and time. However, due to insufficient filling, durability was poor.
In order to solve this problem, Japanese Utility Model Publication No. 58-32145 proposes a vibration applying device in which a vibration mechanism is attached to a fan-shaped pressure plate. Since this device can be rapidly and densely vibrated by remote control, it has advantages in terms of environment and improvement of service life, but it is not efficient.

[0003]

[Problems to be Solved by the Invention]
When using a single device with a vibrating mechanism attached to a pressure plate as shown in No. 5, or if there are multiple devices, if they are independent, each device requires construction personnel. Therefore, there is a limit in terms of efficiency.

[0004]

The inventors of the present invention oscillate and pressurize a stamp material with a plurality of pressure plates equipped with a vibrator, and hang the pressure plates with a balance bar at regular intervals while suspending and sequentially moving them. It has been found that vibration filling enables a small number of people to work efficiently and also improves the service life of the hearth.

[0005]

The function of the vibrator mounted on the pressure plate is preferably a mechanism having a built-in unbalanced weight. The pressure plate may be a thick steel plate, a cast plate, or a box body formed by combining steel plates. The size of the pressure plate depends on the construction area,
It is recommended that the total weight of the pressure plate and the vibrator be 100 kg to 1500 kg, and the horsepower and the number of vibrators that have an amplitude of about 1 mm should be selected in accordance with this weight. The vibration frequency of the vibrator should be about 1800 to 3600 R.PM. The number of pressure plates can be appropriately selected from two or more according to the construction area, but from the viewpoint of handling convenience, two is the easiest to handle. The balance bar is preferably made of H-shaped steel. The length is adjusted according to the construction area. In the case of an electric furnace, a length as large as the furnace diameter is good.

Next, the operation of this method will be described based on the application example shown in FIG. We put dry magnesia stamp material 2 on the backing brick which we finished construction beforehand, and we level it to 200-300mm, and weigh scale bar 3 on it.
Press the pressure plates 4 and 4 ', and hang them with a crane 6 and set them in place. 20-60 in one place
When the vibration is applied for a second, the stamp material is packed to the required density. The required amount of the above-mentioned vibrators 5 and 5'is mounted on the pressure plate according to its weight. After shaking for a certain period of time, hang the pressure plate with the crane 6 and the balance bar and move it to the next place, and similarly shake for 20 to 60 seconds. This operation is repeated in sequence, and when the entire surface is filled, the pressure plate is hung and the stamp material is added. 20
After adjusting to 0 to 300 mm, lower the pressure plate and repeat the above work. By repeating this vibration filling work, it is possible to construct a hearth with a required height. Since this work can be performed remotely from outside the furnace, it is not necessary for the worker to stand in a dusty place.

[0007]

[Example] 60 tons of dry magnesia stamp material (stamp layer thickness: 460 mm) was applied to the hearth of a 100 ton electric furnace for producing ordinary steel having a diameter of 7 m. According to the method of suspending the two pressure plates of the present invention with the balance bar, it took 24 hours for 6 construction personnel (in the conventional method of one pressure plate, 35 construction hours for 5 construction personnel). The service life was 18 days (15 days) until minor repairs, which was 1.2 times longer.

[0008]

EFFECT OF THE INVENTION By implementing the present invention,
Stamp material can be applied to the hearth. It is environmentally hygienic and improves the service life of the furnace material.

[0009]

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a state in which a magnesia stamp material is applied to a hearth of an electric furnace while suspending a pressure plate with a balance rod.

[Explanation of symbols]

 1 ... Lined brick 2 ... Magnesia stamp material 3 ... Balance bar 4 ... Pressure plate 5 ... Vibrator 6 ... Crane

Claims (1)

[Claims] 1. The stamp material 2 is vibrated and pressed by a plurality of pressure plates 4 and 4'on which vibrators 5 and 5'are mounted, and the pressure plates are hung up by a balance bar 3 at regular intervals to be suspended and moved sequentially. A method of constructing a hearth stamp material that performs vibration filling while performing.