JPS6111215Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for charging raw materials at the top of a blast furnace.

In the top charging device of a blast furnace, the first
As shown in the figure, raw materials are introduced from a certain direction by a charging conveyor 1 and stored in a hopper 2. At this time, the raw material draws a falling trajectory with a horizontal velocity component due to the movement of the charging conveyor, so the falling trajectory varies depending on the particle size of the raw material, and the raw material distribution within the hopper 2 is also asymmetrical, as shown in Figure 1. It becomes the shape. If this non-uniform distribution were brought into the blast furnace as it is, it would be an extremely serious obstacle to efficiently maintaining the reaction inside the blast furnace, so various efforts have been made to prevent this.

Therefore, as a preventive measure, a swing chute is generally adopted. The rotating chute is used, for example, in a conventional two-bell valve seal type charging device as shown in FIG. A fixed hopper 2' equipped with four gate valves 4 is installed at the bottom of the
Seal valve 5, small bell hopper 6, small bell 7,
There are many types that use a double seal mechanism consisting of a combination of a large bell hopper 8 and a large bell 9 to drop the raw material into the furnace 10. In this system, since the rotating chute 3 can be continuously rotated, the raw material is dispersed in the circumferential direction within the fixed hopper 2', resulting in a more uniform distribution of the raw material than in the case without the rotating chute 3, as shown in Fig. 1. sex is improved. 1 in the diagram
2 is a bell drive rod, and 11 is a drive device for the gate valve 4.

However, in the conventional rotating chute, the raw material distribution within the hopper at the bottom of the rotating chute was not completely uniform, leaving room for improvement. For example, in the conventional charging device shown in FIG. 2, when the exit direction of the rotating chute 3 is in A and B in FIG. Since the falling direction of the raw material from the rotary chute 3 and the direction of the outlet of the whirling chute 3 are opposite, this results in a change in the flow state of the raw material in the whirling chute 3, which makes it impossible to obtain a completely uniform distribution of the raw material. I couldn't do it. That is, when the rotating chute 3 is at position A, the falling path of the raw material is bent compared to when it is at position B,
For this reason, the flow resistance increases, and the falling state of the raw material changes between A and B, causing non-uniform distribution.

The present invention eliminates the disadvantages in raw material distribution in the conventional charging equipment using a rotating chute as described above,
In order to obtain almost perfect uniform distribution of raw materials, a rotating hopper is provided below the raw material input port of the charging conveyor, and the raw material is stored while the rotating hopper is rotated, thereby improving the uniform distribution of raw materials. It is. At the bottom of the rotating hopper,
A hopper bell that can be rotated is provided along with the hopper, and raw materials are stored and discharged by opening and closing the hopper bell.

Next, an example of a configuration in which the rotating hopper and hopper bell of the present invention are applied to the conventional charging device shown in FIG. 2 will be explained with reference to FIG. 3.

The raw material charged from the drop port 13 of the charging conveyor 1 is continuously stored in the rotating hopper 2'' while the rotating hopper 2'' is rotating.The rotating hopper 2'' is supported by a bracket 20 and a support roller 21, Furthermore, a swiveling hopper drive 22 makes it possible to swivel. The hopper bell 14 attached to the rotating hopper 2'' is connected to a bell drive device 19 via a lower suspension rod 15, an upper suspension rod 16, and a support beam 18, and the hopper bell 14 can be opened and closed by operating the drive device. There is also a lower suspension rod 15 and an upper suspension rod 16.
The hopper bell 1 is connected via a swing bearing 17 and rotates along with the swing hopper 2''.
4 is transmitted to the lower suspension rod 15, and the upper suspension rod 16 only moves in the vertical direction. The hopper bell 14 is rotated by the hopper driving device 22, using the pressure force at the contact surface between the bell and the hopper 2''. The raw material is fed into the small bell hopper 6 through a branch chute 23 as shown in FIG.

The procedure for charging raw materials into the furnace 10 using the double seal mechanism consisting of the seal valve 5, small bell hopper 6, small bell 7, large bell hopper 8, and large bell 9 is explained below with reference to FIG. This is exactly the same as in the conventional method.

The present invention uses the mechanism of the rotating hopper 2'' and the hopper bell 14 to
It becomes possible to store the raw material while rotating the rotating hopper 2'' with the hopper 2'' closed, and it becomes possible to completely eliminate the uneven distribution of the raw material caused by the direction of the conveyor described above. Since the discharge port is annular, it is possible to drop the raw material evenly around the entire circumference, and therefore it is possible to eliminate the cause of uneven distribution of the raw material when discharging the raw material.

As explained above, by applying the rotating hopper and hopper bell of the present invention to the conventional two-bell valve seal type furnace top charging device, it is possible to reduce the particle size segregation and Since the uneven distribution of the amount can be significantly reduced, extremely favorable conditions are provided for blast furnace operation.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the falling state of raw materials from the charging conveyor, Figure 2 is an overall elevational view of a conventional two-bell valve seal type charging device, and Figure 3 is a diagram showing the rotating hopper and hopper bell of the present invention. FIG. 2 is an explanatory elevational view when applied to the conventional type, and FIG. 4 is a plan view of the branch chute shown in FIG. 3. 1...Charging conveyor, 2''...Swivel hopper, 5...Seal valve, 7...Small bell, 8...Large bell, 13...Drop port, 14...Hopper bell, 2
3... Branch shot.

Claims (1)

[Scope of utility model registration request] In a blast furnace raw material charging device that has a large bell, a small bell, and a plurality of seal valves, a rotatable hopper is arranged above the seal valve and below the raw material inlet of the charging conveyor, and the rotating hopper is located at the bottom of the rotating hopper. A blast furnace top charging device, characterized in that a bell for storage and discharge of raw materials is provided, and a branch chute having a discharge port is provided at a position opposite to the seal valve.