JPH0775660B2 - Drum mixer with lump remover - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum mixer having a function of removing lumps in bulk materials such as sintering raw materials.

[0002]

2. Description of the Related Art In a sintering operation, the inclusion of lumps in the raw material has a wide range of adverse effects such as clogging of various gates, disturbance of charging and occurrence of firing unevenness in the progress of sintering, and acceleration. Are known. In order to solve this problem, as a conventional method for removing lumps in the sintering raw material, as shown in FIGS. 5 and 6, for example, a cylindrical slit-shaped rotary sieve 10 is provided by being inclined at the connecting portion of the transport conveyors 4 and 5. Is known (Japanese Utility Model Publication No. 56-76078). In addition, 6 is an under-sieve chute that has dropped from the slit-shaped opening of the sieve 10 and 11 is a lump chute provided in front of 10.
The illustration of the rotary drive device of No. 0 is omitted. Rotating sieve 1
As shown in FIG. 6, a steel round bar 8 is inserted and fixed in holes provided at predetermined intervals in the circumferential direction of three ring-shaped frames 9 to form slit-shaped openings between the round bars 8. is there.

[0003]

When the lump removing device as shown in FIGS. 5 and 6 is used to remove lumps at the connecting portions of the transport conveyors 4 and 5, the raw material transport cross-sectional area is narrow at the connecting portions. Since the speed is high, the round bar 8 is heavily worn and easily clogged. If clogging occurs, not only will the powder ore fall into the lump chute 11, but there will eventually be the problem that the sintering raw material cannot be transported.

[0004]

DISCLOSURE OF THE INVENTION The present invention is to solve the above-mentioned problems, in which one end of a large number of bars is provided at regular intervals around the entire outlet of a drum mixer for mixing and granulating sintering raw materials and discharging. A drum mixer with a lump removing device, characterized in that a slit-shaped opening in the discharge flow direction of the mixed granulation raw material is formed on the entire outer circumference of the drum mixer outlet. Furthermore, it is also characterized in that a hammer is suspended on the movement trajectory of the tip portion of the bar.

[0005]

In the present invention, lumps are removed at the outlet of the drum mixer. Unlike the transfer section of the transport conveyor, the material transfer speed at the drum mixer outlet is low,
Moreover, since the raw material falls widely, the sieving efficiency is good. As a means for this purpose, one end of a large number of bars is attached to the entire circumference of the outlet of the drum mixer at regular intervals, so that a sieve having slit-like openings is formed. At this time, the direction of the slit-shaped opening is set to the discharge flow direction of the mixed raw material. That is, tilt the tip of the bar in the direction opposite to the rotating direction of the drum mixer. Thus, the discharged mixed raw material can be smoothly moved without resistance.

Further, by suspending the hammer on the movement locus of the tips of the bars, it is possible to easily remove the clogging between the bars. That is, since one end of the bar is fixed to the drum mixer and the other end is not supported, a large vibration is generated by a small impact, and the clogging can be automatically removed as the drum mixer rotates.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in FIGS. FIG. 1 is a diagram showing a sintering raw material pretreatment system including the apparatus of the present invention. Reference numeral 1 is a drum mixer, 2 is a bar, and 3 is a hammer for removing deposits on the bar by impact. Figure 2
FIG. 4 is a view showing how the bar 2 is attached to the drum mixer 1, but FIG.
(B) is the figure which looked at this from the drum axial direction. Bar 2
Is fixed to the drum mixer at a predetermined bar mounting angle θ in the direction opposite to the rotating direction of the drum mixer.

Regarding the bar attachment angle, bar length, bar shape, etc., the effects are different depending on the rotation speed of the drum mixer, the properties of the raw materials, etc., and therefore appropriate ones are adopted. The most effective method is the bar mounting angle θ
With regard to, the most effective sieving can be achieved by selecting so as to be parallel to the flow of the raw material discharged from the drum mixer. Further, the bar shape is preferably a round bar, and when using a flat bar, it is necessary to consider the bar twisting angle in addition to the bar mounting angle θ in order to minimize adhesion of raw materials.

That is, FIG. 3 shows the mounting of the drum mixer 1 and the bar 2 when a flat bar is used. (A) is a developed plan view of a part of the outer periphery of the drum, and (b) is a substantially drum shaft. It is the figure seen from the direction. When mounting the flat bar, the bar mounting angle θ is appropriately adjusted and the bar twisting angle α is also taken into consideration to minimize the discharge resistance of the mixed granulation raw material.

FIG. 4 is a detailed view of the hammer 3 shown in FIG. 1, and FIGS. 4 (a) and 4 (b) are side views seen from directions different by 90 degrees. In FIG. 4, 12 and 13 are hanging hardware,
12 is welded and fixed to the fixed surface, and 13 is hung through 12 hanging hardware. 14 is a hammer body 13
It is connected to the hanging hardware by bolts that are welded and fixed to the hanging hardware. Further, it is best to mount the hammer 3 at the position where the tip of the bar 2 comes into contact with the center of the hammer body 14.

FIG. 1 shows an example in which the drum mixer of the present invention is arranged in a sintering raw material pretreatment system. The sintering raw material is charged into the drum mixer 1 from the belt conveyor 4 and granulated in the drum mixer. The granulated raw material is discharged to the outlet side of the drum mixer, but separated into lumps and powder by the bar 2 attached to the entire circumference of the outlet of the drum mixer. The separated powder is on the belt conveyor 5 located under the drum mixer.
Transfer to and transfer to Sinter. In addition, the lumps are discharged to the outside of the transportation system through a discharge chute 15 installed between the drum mixer and a belt conveyor located below the drum mixer.

Application Example FIG. 7 shows an inner diameter of 1700 mm rotating at 100 RPM.
It is a figure showing the effect at the time of implementing this invention to the drum mixer whose sintering raw material supply rate is 185 ton / hr. Here, the shape of the bar is a flat bar as shown in FIG. 3, and the bar is mounted on the inner wall of the drum mixer with a mounting angle θ of 35 degrees and a twisting angle α of 45 degrees, and the bar length is 1000 m.
As a result of operating at m and a bar interval of 50 mm, the inclusion of lumps of 50 mm or more in sintering was reduced.

Further, as the twist angle α was the same as before, the bar attachment angle θ was changed to 27 °, and as a result of the operation, no lump of 50 mm or more was mixed into the sintering. Also, the life of the bar has been dramatically improved compared to the conventional lump separation method at the belt transfer section.

[0014]

EFFECTS OF THE INVENTION In removing lumps in the sintering raw material, a sieve is attached integrally with the drum mixer outlet where the raw material moving speed is low and the raw material falls widely so that efficient work can be performed. . A slit-like opening is formed by a large number of bars, and moreover, it is inclined in the discharge flow direction of the granulated raw material, so that the raw material moves smoothly. Also, clogging can be easily prevented simply by suspending the hammer.

[Brief description of drawings]

FIG. 1 is an overall view of an apparatus of the present invention and a diagram showing a sintering raw material pretreatment system.

2A and 2B are diagrams showing how a round bar is attached to a drum mixer, FIG. 2A is a development view of a part of a drum, and FIG.

3A and 3B are views showing how a flat bar is attached to a drum mixer, FIG. 3A is a development view of a part of a drum, and FIG.

4 (a) and 4 (b) are side views of the hammer viewed from different directions by 90 degrees.

FIG. 5 is a view showing a conventional lump removing device.

FIG. 6 is a view of the rotary sieve of FIG. 5 viewed from the AA ′ direction.

FIG. 7 is a graph showing the effect of the device of the present invention.

[Explanation of symbols]

 1 Drum mixer 2 Bar 3 Hammer

Claims (2)

[Claims] 1. A drum mixer that mixes and granulates sintering raw materials and discharges them, one end of a large number of bars is attached at a constant interval to the entire circumference of the outlet, and the entire outer circumference of the drum mixer outlet is in the discharge flow direction of the mixed granulation raw material. A drum mixer with a lump removing device, characterized by forming slit-shaped openings. 2. The drum mixer with a lump removing device according to claim 1, wherein a hammer is hung on the movement path of the tip of the bar.