JPH0446862B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention provides a segregation prevention device that prevents the segregation of the stacked amount, particle size, and components that occur on the left and right cross sections of the pile when fine ore for sintering is stacked on a bedding pile using a bed stacker. Regarding. [Conventional technology] Iron ore is imported from various countries, so its chemical composition varies and each brand has its own characteristics. Therefore, when using these various iron ores as raw materials for sintering, it is often the case that various types of raw materials are appropriately blended to average out specific components before being used for sintering. In blending these various raw materials, a so-called stacking process is widely used in which a plurality of predetermined types of raw materials are piled up in layers to form a bedding pile. Regarding this stacking, conventional methods were used to stack the raw materials by colliding them against a flat collision plate, but in general, the cross section of the raw materials on the boom conveyor has a grain size segregation in which the upper layer is coarse grains and the lower layer is fine grains. In this state, for example, if raw materials are conveyed from left to right by a boom conveyor and collided with a collision plate, there will be more coarse particles on the right cross section of the pile, and conversely, there will be a tendency for fine particles on the left cross section. becomes. Furthermore, when the stacking height changes, the direction of the collision plate changes, so the falling position of the raw material changes slightly, and the stacking amount on the left and right cross sections of the pile becomes segregated. Therefore, if the loading amount is segregated, component segregation may also occur. Regarding the improvement of this stacking process, the present applicant has provided a chute 7 at the discharge end of the boom conveyor 2 to receive powdery raw materials, as shown in FIG. It is divided into six or more even-numbered sections along the stacking direction of the raw materials, and the discharge ports of each divided section are arranged alternately on the left and right toward the width direction of the bedding pile 19,
We have proposed a stowage distribution chute 7 that evenly stows on both sides of the bedding pile 19. [Problems to be Solved by the Invention] When the distribution chute (Fig. 8) disclosed in the above-mentioned Japanese Utility Model Publication No. 60-137732 was actually manufactured and tested, the following problems were found. found. Raw material is not introduced over the entire width of the distribution chute 7. The raw material sometimes contains lump ore having a particle size of 20 to 30 mm or more, which gets caught in the distribution chute 7 and blocks it. Fine ore adheres and grows at the bending point between the vertical part and the inclined part of the distribution chute 7.
cause blockage. The present invention aims to solve such problems and provides a bed pile segregation prevention device using a bed stacker, which prevents grain size, stacking amount, and component segregation in the left and right cross sections of the bed pile. be. [Means for Solving the Problems] The present invention solves the above-mentioned problems of the prior art. It is applied to a device for preventing segregation of bedding piles, and the following technical measures are adopted. That is,
At the discharge end of the boom conveyor of the bed stacker, a collision plate is installed upright in the flow direction of the raw material, facing the front of the head pulley. This collision plate has an arcuate horizontal cross section with a convex central portion relative to the flow direction of the raw material, and collides with the raw material discharged from the boom conveyor to widen the width of the raw material and cause it to fall. It is equipped with a power cylinder that detects the elevation angle of the boom conveyor, tilts the collision plate in accordance with this detected value, and maintains the collision plate perpendicular to the ground at all times. A comb-shaped grizzly for removing lump ore is placed between the head pulley and the collision plate. An even number of distribution chute having a predetermined width and having a predetermined width are arranged at the lower end of the collision plate at a predetermined angle of inclination. A vibrator is installed on the side of the distribution chute. Each distribution chute is arranged so that its discharge ports are staggered in the width direction of the bedding pile along the raw material stacking direction. [Operation] Hereinafter, the structure and operation of the present invention will be explained in detail based on the drawings. FIG. 2 shows an overall view of an embodiment in which a segregation prevention device 3 comprising a stacking chute according to the present invention is disposed at the discharge end of the boom conveyor 2 of the bed stacker 1. Further, FIG. 1 is a perspective view showing the main parts of the segregation prevention device 3 of the present invention, FIG. 3 is a plan view of FIG. 1, and FIGS. 4 to 6 are sectional views taken along line AA in FIG. 1. ing. The anti-segregation device 3 of the present invention is disposed in front of the head pulley 4 of the boom conveyor 2, and includes a collision plate 5 having an arc-shaped cross section with a convex central portion with respect to the flow direction of the raw material, and a collision plate 5 between the head pulley 4 and the collision plate 5. collision plate 5
a comb-shaped grizzly 16 disposed at a distance of 150 mm to 200 mm from the collision plate 5; a distribution chute 7 disposed at the bottom of the collision plate 5 and supported by a U-shaped bracket 6; Vibrator 2
0, tilt the collision plate 5 and the distribution chute 7,
It consists of a power cylinder 8 for keeping the collision plate 5 and the distribution chute 7 perpendicular to the ground at all times. As shown in FIGS. 3 to 6, the collision plate 5 has a lower end fixed to the frame 11 of the boom conveyor 2 via a shaft 9 and a bearing 10, and an upper end fixed to the frame 11 of the boom conveyor 2 via a bracket 12 and a pin 13. It is connected to the rod 14 of the power cylinder 8. Moreover, as shown in FIG. 1, the collision plate 5 at the upper end of the distribution chute 7 is arranged so that the raw material flows to the right.
An opening 23 is provided in the colliding plate 5 itself to prevent the raw material from becoming clogged. Furthermore, a detector 1 for detecting the elevation angle of the boom conveyor 2
5 is disposed at the end of the shaft 9 of the collision plate 5, as shown in FIG. The structure of the distribution chute 7 is shown in FIGS. 4 to 6.
As shown in the figure, the upper part has a flat shape and the raw material 17
and a wear-resistant material 2 coated on the inner surface of the distribution chute 7 as shown in FIG.
In particular, the slope 18 has an inclination angle of 80 degrees or more, a width of 150 mm to 220 mm, and the opposite side of the slope 18 is open and has a so-called U-shaped cross section. Moreover, the lower discharge ports of the distribution chute 7 are arranged alternately on the left and right with the bracket 6 as a boundary. FIG. 7 is a sectional view taken along line B-B in FIGS. 4 to 6, and the steel plate 22 on the surface of the distribution chute 7 that the raw material 17 directly collides with is made of wear-resistant material with a wear-resistant and low sliding friction coefficient. 21 is shown. Next, the operation of the present invention will be explained. In FIG. 1, the raw material 17 conveyed by the boom conveyor 2 of the bed stacker is discharged from the top of the head pulley 4, passes through a comb-shaped grizzly 16 disposed on the front surface, and collides with the collision plate 5. At this time, the surface of the collision plate 5 with which the raw material 17 collides has an arcuate cross section with a convex central portion with respect to the flow direction of the raw material 17.
After being spread in the width direction, it is thrown into a distribution chute 7 arranged at the bottom of the collision plate 5. The raw material 17 fed into the distribution chute 7 is evenly distributed to the left and right sides of the bedding pile 19 by a distribution chute having a U-shaped cross section with discharge ports arranged alternately on the left and right sides.
It is stacked. When first stacking is performed on the stacking pile 19, the first layer A ₁ and A ₂ are stacked in the form of two mountains as shown in FIG. Because the pile is low, it is not affected by wind, etc., and is stacked in two equal parts on both sides of the ridgeline of chevron-shaped bedding _A1 and _A2 , respectively, to form a two-hump-shaped single pile, and then stacked. 4th layer D, 5th layer E
From then on, the saddle portion of the bedding pile 19 shown in FIG. Therefore, in the bedding pile 19 obtained using the distribution chute 7 of the present invention, the left and right stacking layers A, B, C, D, E, etc. can easily have almost perfect symmetry in any cross section thereof. It is guaranteed. Also, at the start of stacking, the boom conveyor 2 has an inclination angle of approximately
Stacking is started when the distribution chute 7 is lowered 15 degrees downward, and the center of the distribution chute 7 at that time must be perpendicular to the bedding pile 19, so the rod 14 of the power cylinder 8
The collision plate 5 is adjusted by extending the collision plate 5 and rotating the upper end of the collision plate 5 around the shaft 9. FIG. 5 shows a state where the boom conveyor 2 is stacked in a horizontal position. At this time, the center of the distribution chute 7 can be moved by retracting the rod 14 of the power cylinder 8 from the state shown in FIG. It is only necessary to control the angle so that it is perpendicular to the bedding pile 19. FIG. 4 shows a stacking state in which the inclination angle of the boom conveyor 2 is set upward by about 15 degrees. At this time, the rod 14 of the power cylinder 8 is further moved from the state shown in FIG. By retracting, the center of the distribution chute 7 can be controlled perpendicular to the bedding pile 19. The power cylinder 8 described above is driven by the boom conveyor 2.
It is configured to receive a signal from the inclination angle detector 15 and to be appropriately controlled. Furthermore, the raw material 17 conveyed from the boom conveyor 2 sometimes contains lump ore of 100 mm or more, and in that case, the lump ore 24 is combed as shown in FIGS. 4 to 6. It is automatically removed by a shaped grizzly 16 and does not enter the distribution chute 7. In addition, some brands of ore to be stacked are highly sticky, and in such cases, in the past, the ore would adhere to and accumulate on the distribution chute 7, and by blocking the distribution chute 7, the ore would be divided left and right and piled. However, in the present invention, the vibration exciter 20 is operated to apply forced vibration to the collision plate 5 and the distribution chute 7, thereby preventing the adhesion of fine ore. At this time, the vibrator 20 may be operated continuously only when loading the sticky ore, or may be operated with a timer, for example, at intervals of 30 seconds and 5 minutes. [Example] Table 1 shows the results of an investigation of the uniformity of particle size and components in the left and right cross sections of bed piles when stacking was performed using the anti-segregation device of the present invention and when stacking was performed without this device. In the prior art, the stacking cross-sectional shape of the bedding pile is a mountain shape with one peak, but when the segregation prevention device of the present invention is used, it becomes a mountain shape with two peaks, and the stacking amount P divided into two on the left and right sides, The variation in Q is 6.9% in the prior art, while it is 3.6% in the present invention, which is about half that. The difference in average grain size between the left and right cross sections of the bedding pile was 0.12 mm with the conventional technology, but was as small as 0.07 mm when using the segregation prevention device of the present invention.
The variation in TFe is 0.52% in the conventional system, but it is reduced to 0.20% when using the segregation prevention device of the present invention, and the variation in SiO ₂ is reduced to 0.13% in the conventional system, whereas it is reduced to 0.20% in the case of using the segregation prevention device of the present invention. When a segregation prevention device was used, the result was that there was almost no problem. In this example, 12 distribution chute were used, but this can be determined as appropriate based on the width of the boom conveyor, the size of the lump ore contained in the raw material to be removed, etc. However, if the raw material on the boom conveyor is conveyed as a single load, the amount of raw material input to the distributing chute on the opposite side will be extremely reduced, and the bedded pile will become unbalanced. Considering this, it is desirable to provide six or more distribution chute.

【table】

〔Effect of the invention〕

The bed pile segregation prevention device using the bed stacker of the present invention prevents grain size, stacking amount, and component segregation in the left and right cross sections of the bed pile, and also eliminates the problem of fine ore adhesion due to the effect of the vibrator, making it ideal. To easily and reliably realize stacking with good symmetry and to produce an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of one embodiment of the segregation prevention device of the present invention, FIG. 2 is an overall view showing the installation location of the segregation prevention device of the present invention, FIG. 3 is a plan view of FIG. 1, and FIG.
Figures 5 and 6 are sectional views taken along line A-A in Figure 1, and Figure 7 is taken along line B-- in Figures 4, 5 and 6.
B sectional view and FIG. 8 are perspective views of a conventional distribution chute. 1... Bed stacker, 2... Boom conveyor, 3... Segregation prevention device, 4... Head pulley,
5... Collision plate, 6... Bracket, 7... Distribution chute, 8... Power cylinder, 9... Shaft, 10... Bearing, 11... Frame, 12...
Bracket, 13...pin, 14...rod, 1
5... Tilt angle detector, 16... Grizzly, 17
... Raw material, 18 ... Slope, 19 ... Betting pile, 20 ... Vibrator, 21 ... Wear-resistant material, 2
2... Steel plate, 23... Opening, 24... Lump ore, A ₁ ,
A ₂ , B, C, D, E...Stacking layer.

Claims (1)

[Claims] 1. In a device for preventing segregation of a bedding pile when powdered ore raw material for sintering is stacked onto a bedding pile from the discharge end of a boom conveyor of a bedding stacker, a collision plate that is erected and has an arc-shaped horizontal cross section with a convex central portion with respect to the flow direction of the raw material; and a collision plate that detects an elevation angle of the boom conveyor and tilts the collision plate in accordance with the detected value. a power cylinder that always maintains the head perpendicular to the ground; a comb-shaped grizzly disposed between the head pulley and the collision plate to remove lump ore mixed in the raw material; It consists of an even number of U-shaped cross-section distribution chutes fixed at an angle and having a predetermined width, and a vibrator fixed to the side of the distribution chute, and each distribution chute has its discharge port connected to the A device for preventing segregation of bedding piles using bed stackers, characterized in that they are arranged alternately on the left and right sides in the width direction of the bedding pile along the stacking direction of raw materials.