JPH0331473Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a tundish heating device for continuous casting.

BACKGROUND ART A continuous casting apparatus for molten steel is provided with a tundish in front of a mold for the purpose of pouring a fixed amount of molten metal and removing impurities in the molten metal. Various proposals have been made regarding this tandate. For example, a pair of L-shaped iron cores are removably combined into a rectangular shape, an induction heating coil is installed on one side, and a shielding block installed between the hot water receiving chamber and the hot water dispensing chamber is installed vertically. There is a tundish heating device which is connected in a detachable manner (Japanese Patent Application Laid-Open No. 135089/1989).

In this device, a pair of L-shaped cores are usually constructed of laminated plates, and their joining surfaces are fitted into a guide guide and joined at a predetermined position.

Problems that the invention aims to solve: However, if the joint between the L-shaped cores is not held with a constant force, the alternating magnetic flux induced within the core will cause electromagnetic vibration at the joint surface, causing vibrations from the joint surface. The leakage magnetic flux increases, leading to a decrease in the efficiency of the heating device, and there is a possibility that the joint surface may be damaged.

On the other hand, the upper L-shaped core, which is combined into a rectangular shape, has a cooling hood that wraps around the core and serves as a coil cooling air passage, and a conductor for supplying power to the coil runs through it. That is, the L-shaped core is a main part forming the mechanical structure of the heating device, and needs to maintain a certain level of mechanical strength when attached to the tundish. Further operational issues include L-shaped core joining and minimizing separation time.

The tundish is usually placed on a tundish car, and is moved between a continuous casting position and a preheating standby position where the refractories constituting the tundish are preheated and preparations are made before casting.

The standard work procedure at this time will be explained.

(1) Before starting continuous casting, the tundish, which has been previously dried elsewhere and has been equipped with the necessary mechanical parts (nozzles, etc.) for continuous casting, is loaded onto the tundish car in the preheating standby position using a large crane, and then placed in the burner. is preheated to a high temperature (approximately 1200℃).

(2) After preheating, the tundish is moved to the continuous casting position by the tundish car, and continuous casting is performed. Immediately after continuous casting is completed, it is returned to the preheating standby position.

(3) After the tundish is returned to the preheating position, it is transported to another location by a large crane in order to dispose of the remaining hot metal in the tundish and preheat the next tundish.

By the way, the induction heating coil and other electrical parts are electrically insulated to a grade H (heat resistance of 180℃) or lower, so they must be protected from burning out due to heat from the molten steel in the tundish and self-heating of the coil and iron core. be. This is done by forced air cooling using a fan installed on the tandem shuttle car, which sends air to the coil through the cooling hood described above.

Considering the standard operations (1) to (3) above and forced air cooling, there is a risk of burnout if the induction heating coil used for heating during continuous casting is not removed from the preheating standby position within a very short time. Therefore, it is necessary to minimize the separation time of the L-shaped core.

Furthermore, since the standard operations in (1) to (3) are repeated regularly, unless the joining and separation of the L-shaped core is quick and easy, the number of tundishes, maintenance space, and workers must be increased. This leads to a decrease in productivity (T/Hr).

Means for Solving the Problems The purpose of the present invention is to solve the above-mentioned problems.In the tundish that supplies molten metal to molds, etc., there is a fireproof space between the molten metal receiving chamber and the molten pouring chamber. A shield block made of wood is formed, and this shield block is connected to, for example, two
two holes are provided at predetermined intervals, the L-shaped iron cores are removably combined to form a rectangular shape, and an induction coil is provided on one leg of the L-shaped cores, which is removably connected to the shield block in the vertical direction; Further, the L-shaped iron core is tightened by a hydraulic circuit that is constantly pressurized using a hydraulic cylinder.

Function The inductor tightening device of the tundish heating device of the present invention forms a shield block between the hot water receiving chamber and the pouring chamber, and communicates the hot water receiving chamber and the pouring chamber with this shield block. In addition to providing holes, the L-shaped cores are combined into a rectangular shape and are joined by a hydraulic cylinder, so the joint of the L-shaped cores is always held with a balanced tightening force, and the joint surface is In addition, the mechanical strength of the heating device can be stabilized, and the L-shaped core can be quickly joined and separated.

Example The present invention will be described below with reference to the drawings.

The drawings show one embodiment of the present invention,
Figure 1 is a plan view of the tundish heating device;
The figure is a perspective view of a pair of L-shaped iron cores attached to a tundish by a hydraulic cylinder, and FIG. 3 is a side view thereof.

Number 1 is tandem, 2 is outer shell, 3 is protective wall, 4 is iron core, 5 is shield block, 6, 7
is a communication hole, 8 is a hot water receiving chamber, 9 is a hot water pouring chamber, 10 is a through hole, 11 is a coil, 20 and 20' are large diameter hydraulic cylinders, 21 and 21' are small diameter hydraulic cylinders,
22 is an upper L-shaped core, 23 is a lower L-shaped core,
24 and 24' are joint surfaces of the upper and lower L-shaped cores.

First, as shown in FIG. 1, the tundish 1 is provided with a protective wall 3 made of a fireproof material inside an outer shell 2 made of a substantially rectangular steel plate. An induction heating iron core 4 is installed in the central part of the tandem tray 1.
In addition, in order to partition the hot water receiving chamber 8 and the hot water pouring chamber 9, a shielding block 5 is removably provided. The shield block 5 is made of a refractory material, and a through hole 10 is vertically drilled in the center of the block to allow the iron core 4 to pass therethrough. Communication holes 6 and 7 are provided at the bottom of the shield block 5 and on both sides of the through hole 10. The iron core 4 is formed into a rectangular L-shaped iron core, and an induction heating coil 11 is wound around one leg of the iron core 4 . Coil 11 inserted into through hole 10 of this shield block 5
The magnetic field generated by the tundish 1 is generated vertically across the molten metal in the tundish 1. The molten metal is heated by this magnetic field passing through the molten metal. Incidentally, the outer shell 2 is provided with slit-shaped insulators in the vertical direction at appropriate positions in order to prevent the formation of a circular path for the current due to the magnetic field.

In the tundish 1 constructed in this manner, the lower L-shaped core 23 is fixed to the tundish 1, and the upper L-shaped core 22 is fixed to the tundish 1, as shown in FIGS. 2 and 3. Hydraulic cylinders 20, 20',
21, 21' are tightened under the cooling hood 25 of the tundish 1.

Hydraulic cylinders 20, 20', 21, 21' are L
Based on the positional relationship between the joint surfaces 24, 24' of the two-shaped iron cores 22 and 23 and the tundish 1, the force point, the fulcrum, and the point of action, the diameter is such that a clamping force can be obtained that equalizes the surface pressure on the two joint surfaces. Preferably, a hydraulic cylinder is used. For example, in the case of the structure shown in Figures 2 and 3, the right hydraulic cylinder 2
1 and 21' require a smaller force (smaller diameter) than the left hydraulic cylinder 20 and 20'. Specifically, the size of the hydraulic cylinder 20 and 20' is 125 mm.
〓×50ST, the size of the hydraulic cylinders 21, 21′ is 63mm〓×50ST, and the pressure at the joint surface is 10
Kg/cm ² is secured.

Although the illustrated example uses four hydraulic cylinders, the number of cylinders is not particularly limited.
Even if 1 and 21' are omitted and only the hydraulic cylinders 20 and 20' are used, the object of the present invention can be achieved, although the balance of the tightening force will be lacking. Alternatively, this may be made to act as a single cylinder.

Note that since the L-shaped cores 22 and 23 are each formed from a laminated plate, they cannot be properly joined unless they are joined through an insulating plate. The insulating plate preferably has high magnetic permeability. The hydraulic circuit uses a constant pressure circuit so that the hydraulic cylinder always generates a constant clamping force.

Furthermore, the area between the hydraulic cylinder and the tundish and the attachment part of the hydraulic piping are insulated to prevent the slit-shaped insulation provided in the outer shell 2 from being short-circuited, and to prevent interlinkage with the magnetic field generated by energizing the coil. This prevents the formation of a circular passage.

Effects of the Invention As explained in detail above, the tundish heating device according to the present invention is configured to combine an upper L-shaped iron core and a lower L-shaped iron core, and to connect them using a hydraulic cylinder.

Therefore, the joint of the L-shaped iron core is always maintained constant with a balanced tightening force, and an increase in leakage magnetic flux at the joint surface can be prevented, and the mechanical strength of the heating device can be stabilized.

Furthermore, the L-shaped core can be quickly joined and separated. Therefore, it is easy to replace the tundish and adjust the tightening force quickly, and since the upper and lower L-shaped cores are joined through an insulating plate, fine adjustment of magnetic permeability is required, but the hydraulic cylinder It is done with great precision.

[Brief explanation of drawings]

Fig. 1 is a plan view of a tundish heating device according to one embodiment of the present invention, Fig. 2 is a perspective view of a pair of L-shaped iron cores attached by a hydraulic device, and Fig. 3 is a side view thereof. be. 1...Tandaitsuyu, 2...Outer skin, 3...
Protection wall, 4...iron core, 5...shiyahei block,
6, 7...Communication hole, 8...Pouring chamber, 9...Pouring chamber, 10...Through hole, 11...Coil, 20,2
0'...Large diameter hydraulic cylinder, 21, 21'...Small diameter hydraulic cylinder, 22...Upper L-shaped iron core, 2
3...Lower L-shaped core, 24, 24'...joint surface,
25...Cooling hood.

Claims (1)

[Scope of utility model registration request] In a tundish that supplies molten metal to molds, etc., a shield block made of refractory material is formed between the molten metal receiving chamber and the molten pouring chamber, and the molten metal receiving chamber and the molten pouring chamber are communicated with this shield block. A plurality of holes are provided at predetermined intervals, L-shaped iron cores are removably combined to form a rectangular shape, and an induction heating coil is provided on one leg of the L-shaped core, which is removably connected to the shield block in the vertical direction. An inductor tightening device for a tundish heating device, characterized in that the L-shaped iron core is tightened by a constantly pressurized hydraulic circuit using a hydraulic cylinder.