JPH0341277Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a raw material charging device installed in a raw material storage hopper of a vertical smelting furnace.

(b) Conventional technology In vertical smelting furnaces where solids and reducing gas are brought into contact, contact efficiency greatly affects productivity and stable operation, so improving the accuracy of raw material charge distribution is considered important. There is.

Generally, when charging raw materials to a raw material storage hopper, the raw material charges that fall from a belt conveyor or skip tend to accumulate coarse particles on the surface and fine particles at the bottom, so the larger the particle size, the more horizontal it is. Since the velocity component in the direction is large, fine particles tend to accumulate on the charging side and coarse particles tend to accumulate on the anti-charging side.

As a conventional technique for alleviating this particle size deviation, there is a device in which raw material already contained in a hopper is charged into a furnace through a chute equipped with a raw material flow control member (Japanese Patent Application Laid-Open No. 133904/1983). This device is designed to uniformize the raw material distribution in the circumferential direction inside the furnace, but if the particle size distribution inside the hopper is uneven, it is not possible to make the particle size inside the furnace uniform.

Further, Japanese Utility Model Publication No. 59-5725 discloses a hopper in which a rotary chute is provided on the central axis of the hopper, and raw materials are charged while rotating the chute.
In this case as well, the particle size of the raw material stream is mixed, so even if the material is swirled, the effect of uniformly dispersing the material falling is small, and the disadvantage is that the installation space and equipment costs are increased.

(c) Problems to be solved by the invention The problem to be solved by the invention is to prevent material particle size deviations in the circumferential direction and radial direction when charging raw materials into the raw material storage hopper. The object of the present invention is to provide a raw material charging device that alleviates this particle size deviation.

(d) Means for solving the problem The raw material charging device of the raw material storage hopper for a vertical smelting furnace of the present invention is arranged by combining the falling end of the belt conveyor for feeding the charged raw material with the charging inlet. In the raw material charging device installed in the raw material storage hopper of a vertical smelting furnace, there is a repulsion plate that can be moved horizontally and the angle can be adjusted and is protruded at the position where the raw material flow falling from the belt conveyor collides, and a repulsion plate that can be moved horizontally and vertically. The above-mentioned problem is solved by a structure that includes a rectifying plate that is made possible and protrudes from the center of the hopper below the repulsion plate, and a mechanism that adjusts and operates the repulsion plate and the rectifying plate.

(E) Embodiment The configuration of an embodiment of the raw material charging device according to the present invention will be explained with reference to FIG. Raw material storage hopper (hereinafter referred to as
The hopper 1 has an open upper charging port, and a falling end of a belt conveyor 2 for feeding raw materials is assembled on one side of the hopper in a slightly protruding state.

Inside the hopper 1, there is a repulsion plate 3 whose angle can be adjusted freely.
and a rectifier plate 4 at a position below this repulsion plate 3, and separate support bars 3 passing through the side wall of the hopper 1.
1 and 41.

The repulsion plate 3 is arranged on the falling trajectory of the raw material stream 6 (mainly coarse particles) falling from the belt conveyor 2, so that the raw material stream collides with the plate surface and is reflected to the center of the hopper, causing it to fall. It is set as. The repulsion plate 3 is supported by a support bar 31, and an angle adjustment mechanism including an angle adjustment bar 32 and a cylinder 33 allows the angle of opposition to the raw material flow 6 to be varied. The support bar 31 is connected to a movable part 5 in the hopper section, and the protruding position in the hopper 1 can be varied and adjusted by moving the movable part 5 toward and away from the cylinder 51.

The adjustment plate 4 is fixedly supported in a horizontal position by a support bar 41, and can be moved in the horizontal direction in which it projects and in the vertical direction. That is, the other end of the support bar 41 is connected to the movable part 5 which is common to the repulsion plate, and the protrusion position in the hopper is changed by the movement of the movable part 5, so that the amount of protrusion can be adjusted. During the process, it always moves in synchronization with the repulsion plate 3. However, in the vertical direction, a unique height can be selected using the lifting cylinder 42.

The support bar 31 and angle adjustment bar 32 that support the repulsion plate 3, and the hopper wall penetration portion of the support bar 41 of the adjustment plate 4, are all configured to prevent the charged material in the hopper from leaking to the outside. be.

(f) Effect The raw material fed into the hopper 1 by the belt conveyor 2 tends to accumulate coarse particles on the surface layer on the conveyor, and falls with inertia during conveyor transfer, so the falling edge of the conveyor It does not immediately fall vertically, but falls slightly horizontally with a velocity component. In this case, the velocity component in the horizontal direction becomes larger as the particles become coarser, and they tend to be deposited on the opposite side of the hopper.

In the present invention, a repulsion plate 3 set at a predetermined reflection angle is placed on the trajectory of the coarse raw material flow 6, and the collision kills the horizontal velocity component of the raw material flow 6, causing it to fall downward.

The raw material flow whose momentum in the horizontal direction is lost by the collision with the repulsion plate 3 falls onto the adjustment plate 4 in a substantially vertical state. For this reason, the rebound direction of the raw material flow is not biased toward a specific direction, but is scattered almost evenly over the entire circumferential direction.

The angle at which the raw material stream falls varies depending on the speed of the conveyor and the particle size and type of the raw material. Then, the reflection angle of the repulsion plate 3 is set, and the vertical position of the adjustment plate 4 is further set.

When the level of the raw material charged into the hopper gradually rises, the movable part 5 is moved to retreat the adjusting plate 4 to a position where the raw material accumulation level is high.

(G) Effect When using the raw material charging device of the present invention, the particle size deviation during raw material charging was measured at three levels in the hopper shown in Figure 2, and at charging side B, center C, and counter. The charging side B' was investigated and compared with the tendency when the device of the present invention was not used, as shown in Fig. 3.

As is clear from FIG. 3, in the particle size deviation state a when the device of the present invention is not used, there is a marked tendency for coarse particles to be concentrated and deposited on the anti-insertion side B'. On the other hand, when using the device of the present invention, the tendency of A is as follows.
It can be seen that the distribution of coarse grains in the circumferential direction is almost uniform and shows the same tendency at all levels.

As described above, according to the present invention, it is possible to effectively alleviate the deviation in the particle size of the raw material in the hopper, which is extremely effective in stabilizing the operational efficiency of the vertical smelting furnace.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a raw material storage hopper equipped with a raw material charging device according to the present invention, and FIG. 2 is an explanatory diagram of the level of raw materials input into the hopper. FIG. 3 is a comparison diagram of raw material particle size deviation states obtained at each level shown in FIG. 2 when the device of the present invention is used and when it is not used. 1: Raw material charging hopper, 2: Belt conveyor,
3: Repulsion plate, 4: Adjustment plate, 5: Movable plate, 6: Raw material flow (rough flow).

Claims (1)

[Scope of utility model registration request] In the raw material charging device installed in the raw material storage hopper of a vertical smelting furnace, which is arranged by combining the falling end of the belt conveyor for feeding charged raw materials with the charging inlet, it is possible to horizontally move and adjust the angle from the belt conveyor. a repulsion plate protruding from a position where the falling raw material flow collides; a rectifying plate that is movable horizontally and vertically and protruding from a central position in the hopper below the repulsion plate;
A raw material charging device for a raw material storage hopper for a vertical smelting furnace, comprising a mechanism for adjusting and operating the repulsion plate and the rectifying plate.