JPH063359Y2 - Raw material supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a raw material supply device for supplying a raw material from outside the furnace to the inside of the furnace.

[Conventional technology]

For example, since the inside of a melting furnace such as a gas melting furnace is generally maintained at a positive pressure, in order to supply the raw material from the outside of the furnace into the furnace, a raw material supply device forcibly feeding it against the internal pressure of the furnace is used. It is used.

As a conventional raw material supply device, a raw material feeding pipe that goes from the outside of the furnace to the inside of the furnace is vibrated or a diaphragm accommodated in the raw material feeding pipe is vibrated to slip the raw material fed into the raw material feeding pipe. Widely used are those that drop and supply into the furnace, and those that place a screw in the raw material feed pipe and put the raw material introduced into the raw material feed pipe on the rotating screw to convey the raw material into the furnace. ing.

[Problems to be solved by the invention]

In the raw material supply device that feeds the raw material into the furnace with the above vibration, when the raw material is powder or the like, it receives wind pressure from the inside of the furnace, so it accumulates in the middle of the pipe and smoothly supplies it into the furnace. Is difficult to do. Further, in the case of a powder raw material having variations in particle size or specific gravity, segregation (separation of raw materials) occurs in the process of charging into the furnace due to the same wind pressure.

On the other hand, in the case of the raw material supply device for supplying the raw material into the furnace by the screw, there is no difficulty as described above, but the structure is complicated, and the screw diameter in the pipe becomes a dead space, so that the pipe diameter is large. For that reason, the ability to supply raw materials is small. Further, when the raw material is hard, abrasion of the screw is promoted, so that maintenance is always required.

The present invention provides a raw material supply device for solving the above problems.

[Means and Actions for Solving Problems]

The raw material supply device of the present invention is provided with a raw material feed pipe from the outside of the furnace to the inside of the furnace, a raw material inlet provided at the proximal end side of the raw material feed pipe, and a proper place of the raw material feed pipe. , Which isolates the atmospheric pressure on the raw material inlet side from the furnace internal pressure of the internal river, and creates a swirling flow around the axis of the pipe for giving a swirling motion to the raw material that is input from the raw material inlet and drops in the pipe. And an air blower that forms an air curtain.

According to the present invention, the air curtain isolates the atmospheric pressure outside the furnace inside the feed pipe and the furnace pressure inside the furnace, so that the raw material that has passed through the air curtain enters the range of the furnace pressure and smoothly. Drop into the furnace. In addition, since the raw material falling in the passage pipe is given a swirling motion by the swirling flow of the air curtain when passing through the air curtain, after passing through the air curtain, the raw material is sent until it reaches the furnace. A spiral drop in the pipe. Therefore, the raw material is smoothly and uniformly supplied into the furnace without any accumulation or segregation in the tube.

〔Example〕

 An embodiment of the present invention will be described below with reference to FIG.

The raw material supply device (1) includes a raw material feed pipe (10) for dropping and feeding the raw material from the outside to the inside of the melting furnace (20), and an air blower (30) installed in the raw material feed pipe (10). ) And.

The raw material feed pipe (10) extends obliquely through the furnace wall (21) of the melting furnace (20) and is directed into the furnace.

A raw material inlet (11) that opens upward is formed at the base end side of the raw material feed pipe (10), and the crucible (2) inside the melting furnace (20) is formed at the terminal end.
A raw material outlet (22) opening toward the inside is formed.
Then, the raw material hopper (50) is arranged at the base end side of the raw material feeding port (11) of the raw material feeding pipe (10), and the blower (30) is provided slightly below the raw material feeding port (11). ing.

This blower device (30) has a blower (31) as a blower source, and an air flow distribution plate (32) provided at a blower outlet. Airflow distribution plate (3
2) has a blower outlet (33) formed in the diameter direction of the raw material feed pipe (10), for example, as shown in FIG. 3, in which the opening width at the other end is gradually made smaller than the opening width at the other end. There is. This outlet (33)
The air blown out from the blower outlet (32) flows from the side with the larger opening width of the blower outlet (33) along the diametrical direction of the raw material feed pipe (10) as shown by the arrow in FIG. The air volume distribution is such that the air volume decreases toward the smaller opening width.

As shown in FIG. 4, an air curtain (100) forming a swirling flow around the axis of the pipe (10) is formed by this air flow distribution, and the pipe outside the furnace is bordered by this air curtain (100). The inside of (10) is maintained at atmospheric pressure, the inside tube of the furnace (10) is maintained at the inside pressure of the furnace, and the swirling flow of the air curtain imparts a swirling motion to the raw material that crosses this and falls in the pipe. .

A cooling pipe (40) is externally fitted to the raw material feed pipe (10) from a penetrating portion of the melting furnace (20) to a projecting portion in the furnace to prevent heating by the heat in the furnace. . The cooling pipe (40) is provided with a cooling water introduction pipe (41) that is deeply introduced to the tip and a cooling water discharge pipe (42) that is led out from the base end, and the cooling water is in the cooling pipe (40). It is designed to flow through.

With such a configuration, when a raw material such as powder is charged into the raw material hopper (50) and dropped into the furnace through the raw material inlet (11) of the raw material feed pipe (10), Air curtain (1
(00), the swirling force is applied to the raw material, and the raw material is spirally dropped in the pipe (10) held at the furnace pressure as shown by the double-dotted line in FIG. Can be reliably supplied into the furnace.

In the above example, the raw material feed pipe (10) raw material inlet (1
Although the raw material hopper (50) is described in 1), the present invention is not limited to this, and instead of the raw material hopper (50), for example, a belt conveyor may be provided, or, The raw material may be directly fed from the raw material feeding port (11) without providing such feeding means.

[Effect of device]

According to the raw material supply device of the present invention, when the raw material introduced from the raw material inlet is passed through the air curtain, a swirling kinetic force is applied to the raw material feeding pipe which is kept at the furnace pressure by the air curtain. Since it falls in a spiral shape, the raw material such as powder can be smoothly fed into the furnace without being accumulated or segregated. Further, since the raw material can be smoothly fed into the furnace, the raw material can be continuously fed into the raw material feed pipe. Further, in the raw material supply device of the present invention, since the air blower is provided in the raw material supply pipe, the raw material supply device that supplies the raw material into the furnace with vibration as in the past, or the raw material in the furnace by the screw. The structure is simpler and the maintenance is easier than that of the raw material supply device. Further, as compared with the case where the screw is housed in the raw material feeding pipe like the raw material feeding device using the screw, the raw material feeding pipe can be effectively used without a dead space in the pipe.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is a sectional view showing the relationship between a melting furnace and a raw material supply device, and FIG. 2 is a view taken along line II-II in FIG. FIG. 3 is a cross-sectional view showing the air flow distribution of the air blower for the raw material feed pipe, and FIG.
FIG. 4 is a cross-sectional view seen in the line direction, and FIG. 4 is an explanatory view schematically showing the swirling flow of the air curtain. 10: Raw material flow pipe, 11: Raw material input port, 30: Air blower, 10
0: Air curtain.

Claims (1)

[Scope of utility model registration request] 1. A raw material feed pipe extending from the outside of the furnace to the inside of the furnace, a raw material feed port provided at a base end side of the raw material feed pipe, and a raw material feed pipe provided at an appropriate position of the raw material feed pipe. An air curtain that separates the atmospheric pressure on the mouth side from the furnace pressure inside the furnace, and makes a swirling flow around the axial center of the pipe for giving a swirling motion to the raw material that is input from the raw material input port and falls in the pipe. And a blower device for forming a raw material supply device.