JP5774353B2 - Descent guiding device in powder and particle feeder - Google Patents

Description

  The present invention relates to a descending guidance device for a powder feeder that quantitatively discharges particles of iron ore and the like discharged from a gap between an inner cylinder lower end and an outer cylinder bottom plate into an annular passage between the inner and outer cylinders from an opening of the passage. Is.

  Conventionally, the powder feeder has a relatively low height, the outer periphery of a large inner cylinder by upper and lower opening cylinders having a relatively large diameter, and the upper end of a bottomed outer cylinder by a large diameter upright cylinder sharing a central axis. Are integrally connected by an annular horizontal plate, and the granular material in the inner cylinder is discharged from the gap between the bottom plate of the outer cylinder and the lower end of the inner cylinder into an annular passage formed between the inner and outer cylinders by forming an angle of repose. Then, the discharged powder particles are rotated along the annular passage by a rotating arm, a rotating ring, a rotating claw and the like that rotate along the inner surface of the outer cylinder of the annular passage, and are discharged from the discharge port formed in the bottom plate of the passage to the outside of the machine. A fixed amount was supplied.

  When throwing a relatively poor material with poor fluidity, such as iron ore or iron scrap, into the above-mentioned upright cylindrical inner cylinder, a baffle plate or cylinder center projecting vertically on the inner cylinder inner surface A vertical protrusion for rotation prevention comprising two obtuse angles protruding in the direction is provided to prevent rotation with the rotating arm (Patent Documents 1 and 2).

Utility Kaihei 6-35235 JP 2009-256026 A

  By the way, in the above-mentioned conventional granular material supply device, the granular material slides down the pressure along the smooth inner surface of the inner cylinder (cylinder), and the rotating arm rotates with the lower pressure acting on the rotating arm. It is necessary to drive.

  In the conventional powder supply apparatus having the above-described configuration, the rotation of the rotating arm is prevented while preventing the rotation of the powder by a simple method in order to reduce the size of the entire apparatus and save labor. Therefore, it is desired to stably and quantitatively supply powder particles without unevenness. It is also desired to take measures against wear of rotating parts such as rotating blades.

In the present invention, the above granular material is not provided, and the granular material is lowered relatively smoothly along the inner surface of the inner cylinder, so that the quantitative supply by the uniform angle of repose to the annular passage and the required rotational power are stably supplied. It is for the purpose.
Another object of the present invention is to provide a descending guidance device for a powder and particle feeder that suppresses wear of rotating parts such as rotating blades and has improved service life.

In order to achieve the above object, the present invention
First, the outer surface of the inner cylinder of the upper and lower end openings provided in the machine frame and the upper end of the bottomed outer cylinder are integrally connected on a common central axis by an annular partition plate, and formed between the inner and outer cylinders. A plurality of annular passages and a flow interval formed between a lower end of the inner cylinder and a bottom plate of the bottomed outer cylinder, and a plurality of rotating around the central axis along the upper surface of the bottom plate Provided with rotating blades, the tips of these rotating blades connected to a rotating wheel provided along the inner peripheral surface of the bottomed outer cylinder, provided with a plurality of feed claws directed inward to the rotating wheel, and the circle In a granular material supply machine in which a supply port is opened in a bottom plate of an annular passage, and an inflow prevention plate to the supply port is provided at a lower end of the inner tube corresponding to the supply port, the inner tube is formed into an inverted conical shape. None as a reverse conical inner cylinder, formed on the downward slope shape toward the inner cylinder center direction of its outer surface in the reverse conical shape, the downward inclined An outer side surface and an upper end of the bottomed outer cylinder are integrally connected to the common center line by the annular partition plate, a short cylinder is provided at a lower end of the inverted conical inner cylinder, and the circulation is provided at a lower end of the short cylinder. The inflow blocking plate is provided at the lower end of the short cylinder corresponding to the supply port, and the entire inner surface of the inverted conical inner cylinder, the entire inner surface of the inflow blocking plate and the short cylinder are formed in a mesh shape. It is constituted by a descending induction device in a powder and particle feeder that is formed by performing hard build-up welding and applying a net-like hard build-up welding to the entire upper surface of the rotary blade .

Therefore, since the inner cylinder has an inverted conical shape, the lower pressure drop of the granular material is dispersed by the inner surface of the inner cylinder. Rotational power can be reduced. At the same time, it is possible to effectively prevent the powder particles from being rotated by the hardfacing welding (10) on the inner surface of the inner cylinder. If comprised in this way, the surroundings of the granular material in an inner cylinder can be effectively prevented by the mesh-shaped convex strip (10 '') and concave surface (10 ') in an inner cylinder inner surface. Wear of the rotating blades can be effectively prevented by the mesh-like ridges (10 ″) and the concave surfaces (10 ′) on the upper surface.

  Therefore, by the hardfacing welding (10) on the inner surface of the short cylinder, it is possible to more effectively prevent the powder particles in the inner cylinder from circulating.

  If comprised in this way, abrasion of a rotary blade upper surface can be prevented effectively.

Composed of downward flow guide apparatus in the granular material feeder according to the central axis of the first invention which has been subjected to hardfacing welding around the boss portion upper surface of the rotary blade in the second.

  If comprised in this way, abrasion of the upper surface of a boss | hub part can be effectively prevented by the hardening build-up welding (10a) of a boss | hub part.

Third, composed of downward flow guide apparatus in the granular material feeder of the second, wherein the hardfacing welding is radial hardfacing welding.

  If comprised in this way, abrasion of the upper surface of a boss | hub part can be effectively prevented by the radial protruding item | line (10 ") and concave surface (10 ') of the hardening overlay welding (10a) of a boss | hub part.

  Therefore, for example, in the powder supply machine used for iron ore or iron scrap smashing etc., by making the inner cylinder an inverted conical shape, the pressure drop under the powder can be reduced in the portion close to the rotary blade, and the rotary blade The required power of rotation can be reduced.

  Further, by hardening and welding the inner surface of the inner cylinder, the friction coefficient of the inner surface of the inner cylinder can be made large, and the rotation of the powder and particles can be effectively prevented.

  Moreover, when the said short cylinder is provided, the surrounding of the granular material in an inner cylinder can be prevented more effectively by performing hardening overlay welding on the inner surface.

  Further, by performing overlay welding on the upper surface of the rotating blade, it is possible to effectively prevent wear on the upper surface of the rotating blade and improve the service life of the powder and particle feeder.

  Further, by performing hard overlay welding on the boss portion, it is possible to effectively prevent wear on the upper surface of the boss portion and improve the service life of the powder and particle feeder.

  Further, the hardfacing welding can effectively prevent the powder particles from being rotated by the ridges and concave surfaces such as a mesh shape.

  In addition, the hardfacing welding can improve the wear resistance of the inner surface of the inner cylinder and the like, and can improve the service life of the powder feeder.

  Further, since the hardfacing welding on the inner surface of the inner cylinder and the upper surface of the rotary blade is a mesh-like unevenness, and the hardfacing welding on the upper surface of the boss part is a radial unevenness centered on the central axis, The inner cylinder wall surface coefficient of friction can be increased to prevent the granular material from rotating, and the rotational pressure and lower pressure drop of the granular material can be reduced. Further, in the rotating blade and boss portion, the rotating blade and boss portion Can be effectively prevented, and the granular material in the inner cylinder can be stably delivered to the annular passage and can be stably discharged from the supply port to the outside of the machine.

It is a vertical front view which shows the descent | fall guidance apparatus in the granular material supply machine which concerns on this invention. FIG. 2 is a partially longitudinal plan view of FIG. 1. It is a vertical side view of the inner cylinder lower end part by the FIG. 1A-A line. It is a partially expanded front view of a net-like hardened overlay weld. It is a longitudinal cross-sectional view by the FIG. 4B-B line.

  The machine casing 1 is provided with an inverted conical inner cylinder 2 having upper and lower ends opened. As shown in FIG. 1, a cylinder (short cylinder) 2 ′ that is short in the vertical direction is integrally provided on the entire periphery of the lower end of the inner cylinder 2. An inflow-preventing plate 2 ″ to the supply port 4 formed in the outer annular passage 3 is protruded downward at the lower end of the inverted conical inner cylinder 2 directly or via the short cylinder 2 ′ (FIG. 1, FIG. FIG. 3).

  A bottomed outer cylinder 4 ′ is arranged in the middle outside of the inverted conical inner cylinder 2, and the upper end of the bottomed outer cylinder 4 ′ and the middle outer surface of the inner cylinder 2 are shared by the annular partition plate 5. It is integrally connected on the central axis c, and is formed between the annular passage 3 formed between the inner and outer cylinders 2 and 4 ′, and the lower end of the inner cylinder 2 and the bottom plate 6 of the outer cylinder 4 ′. By allowing the inner cylinder 2 and the passage 3 to communicate with each other through the flow interval T, the granular material in the inner cylinder 2 can flow into the annular passage 3 while forming an angle of repose α.

  A supply port 4 is opened in the bottom plate 6 of the passage 3, and an inflow prevention plate 2 ″ to the supply port 4 is provided at the lower end of the inverted conical inner cylinder 2 or the short cylinder 2 ′ corresponding to the supply port 4. Provide (see FIG. 3).

  A prime mover 8 provided with a plurality (three to four) of rotating blades 7, 7, 7, 7 rotating around the central axis c along the upper surface of the bottom plate 6 is provided on the lower surface of the central portion of the bottom plate 6. Provided at the upper end boss portion 9 of the pivot shaft.

  The inverted conical inner cylinder 2 formed in this way, the short cylinder 2 ′ provided at the lower end of the inner cylinder 2, and the entire inner surface of the inflow blocking plate 2 ″ and the upper surfaces of the rotary blades 7, 7, 7, 7 The entire surface is subjected to mesh-cured overlay welding (cured overlay welding) 10 (cured overlay welding) 10 such as rhombuses and squares by curing overlay welding (see FIG. 3), and the upper surface of the boss portion 9 is centered on the central axis c. Radial uneven hardening overlay welding (radial hardening overlay welding) 10a is performed on the entire boss portion 9 (see FIG. 2).

  A concentric rotating wheel 11 provided along the inner peripheral surface of the outer cylinder 4 ′ is connected to the tips of the rotating blades 7, 7, 7, 7. The feed particles 12 are provided, and the powder β injected into the inner cylinder 2 forms an angle of repose α from the flow interval T and enters the annular passage 3. 7, 7, 7, the rotating wheel 11 and the feed claw 12 are rotated to transfer the annular passage 3, and then transferred from the supply port 4 to the powder processing step via a lower conveyor (not shown). Is done.

  The mesh overlay welding by the cured overlay welding 10 is performed by connecting the linear ridges 10 ″ to the entire inner surface 2a ′ of the inner cylinder 2, the entire inner surface of the short cylinder 2 ′, the entire inner surface of the inflow blocking plate 2 ″ and the rotating blades. 7 is formed by welding in a grid pattern on substantially the entire upper surface, thereby forming a net-like hardened weld 10 composed of a concave surface 10 ′ and a convex strip 10 ″ (see FIGS. 4 and 5). The cured build-up weld 10a of the boss portion 9 is also composed of a ridge 10 ″ radially welded and a concave surface 10 ′ other than that (see FIG. 2).

With this configuration, the granular material supplied into the inner cylinder 2 is in contact with the inner surface 2a ′ of the inner cylinder 2 and the rotary blade 7, but is in contact with the mesh-shaped cured overlay welding 10 as described above. Friction resistance is received from the entire inner surface 2a 'of the cylinder 2, the entire short cylinder 2', and the inner surface of the inflow blocking plate 2 ", whereby the entire granular material in the inner cylinder 2 rotates in the same direction together with the rotary blade 7. The height of the ridge 10 ″ with respect to the concave surface 10 ′ is preferably about 1 mm to 2 mm, for example.
Further, the rotating blade 7 and the boss portion 9 are rotated in a state where the granular material is in contact with the upper surface of the rotating blade 7 and the upper surface of the boss portion 9. 10 and 10a (projection 10 "and concave surface 10 '), surface wear due to contact with iron ore or iron dust or the like is suppressed, and the upper surface of the rotary blade 7 and the upper surface of the boss portion 9 are suppressed. Can be prevented.

  Further, the inverted conical cylinder 2 has a peripheral side surface (outer surface 2a) formed in an inverted conical shape so as to be inclined downward toward the center of the inner cylinder (see FIG. 1), and the outer surface 2a is formed as described above. It is provided at a position very close to the upper surface of the rotary blade 7. Therefore, the lower pressure drop (vertical direction) of the granular material supplied into the inverted conical cylinder 2 is perpendicular to the inner surface 2a 'and the direction along the inner surface 2a' by the inverted conical inner surface 2a '. Since the inner cylinder is dispersed in the direction, the lower pressure drop of the granular material applied to the rotary blade 7 on the bottom surface 6 can be reduced as compared with the case where the inner cylinder is cylindrical.

  In particular, in the case of a conventional cylindrical inner cylinder, the lower pressure drop in the vertical direction of the granular material directly acts on the rotating blades in the area in the cylinder. However, the inverted conical peripheral side surface (outer surface 2a) Therefore, the lower pressure drop of the granular material can be reduced at the upper surface portion of the rotary blade 7 corresponding to the inner side of the lower end of the inverted conical inner cylinder 2.

  In FIG. 1, reference numeral 13 denotes a lower end level raising / lowering adjustment ring of the inner cylinder 2, 14 a support plate provided on the outer surface of the inner cylinder 2, 15 an elevation adjustment screw of the ring 13, 16 a support frame of the prime mover 8, 17. Is a cylindrical hopper connected to the upper surface of the inner cylinder 2.

  Therefore, when a relatively large-sized iron ore grain, steel scrap crushed grain or the like is put into the inverted conical inner cylinder 2, the powder body becomes the hardened meat on the inner surface 2 a ′ of the inner cylinder 2. A mesh-like unevenness (concave surface 10 ′, ridge 10 ″) (FIG. 5) by mesh overlay welding of the prime welding 10 is brought into contact with the inclined surface and lowered by the rotary blades 7, 7, 7, 7. Without causing rotation against the wall friction caused by the mesh-like irregularities 10 ′, 10 ″ by force, the annular passage 3 is rotated and lowered along the inner surface 2a ′ of the inverted conical inner cylinder 2; The powder pressure (lower pressure drop) can be reduced at a place closer to the rotation range of the rotary blades 7, 7, 7, and 7, and the required power can be reduced.

  Further, the inner wall of the short cylinder 2 ′ provided at the lower end of the inverted conical inner cylinder 2 can be prevented from being rotated by the wall friction by the hard welding 10, and the powder β Can be cut out by the angle of repose α.

  Further, due to the presence of the hardfacing welds 10 and 10a, the inner surface 2a ′ of the inner cylinder 2, the inner surface of the short cylinder 2 ′, the inner surface of the inflow blocking plate 2 ″, the upper surface of the rotary blade 7 and the upper surface of the boss portion 9 The abrasion resistance due to the contact of the granules can be effectively increased.

  The present invention, as described above, in the granular material supply machine used for iron ore or iron scrap smashing, etc., by making the inner cylinder an inverted conical shape, in the portion close to the rotary blade, the pressure reduction below the granular material The power required for rotation of the rotary blade can be reduced.

  Further, since the hardfacing welding on the inner surface of the inner cylinder and the upper surface of the rotary blade is a mesh-like unevenness, and the hardfacing welding on the upper surface of the boss part is a radial unevenness centered on the central axis, The inner cylinder wall surface friction coefficient, the upper surface friction coefficient of the rotating blade, and the upper surface friction coefficient of the boss part can be made large to reduce the rotational pressure and lower pressure drop of the granular material. In addition, the rotating blade and the boss portion can effectively prevent the rotating blade and the boss portion from being worn, and the powder particles in the inner cylinder can be stably delivered to the annular passage. In addition, there is an effect that can be stably discharged from the supply port to the outside of the apparatus.

  Further, by performing overlay welding, the wear resistance of the inner surface 2a ′ of the inner cylinder 2, the inner surface of the short cylinder 2 ′, the inner surface of the inflow blocking plate 2 ″, the upper surface of the rotary blade 7 and the upper surface of the boss portion 9 is improved. Can be effectively increased.

  The descending guidance apparatus in the powder and particle feeder according to the present invention can stably and quantitatively supply iron ore powder and the like from the supply port 4 provided in the annular passage 3 into the blast furnace. Can be stably supplied to an electric furnace or the like. Moreover, the descending induction device in the powder and particle feeder according to the present invention can be widely applied not only to the iron ore powder and the like, but also to other powders and the like in general.

1 Machine frame 2 Reverse conical inner cylinder (inner cylinder)
2 'short cylinder 2 "inflow blocking plate 2a outer side surface 3 annular passage 4 supply port 4' bottomed outer cylinder 5 annular partition plate 6 bottom plate 7 rotary blade 9 boss part 10 mesh hardening overlay welding (network hardening) Overlay welding)
10a Radial uneven hardfacing welding (radial hardfacing welding)
10 'Concave surface 10 "Convex strip 11 Rotating wheel 12 Feed claw c Common central axis T Distribution interval

Claims (3)

An annular passage formed between the inner and outer cylinders by integrally connecting the outer surface of the inner cylinder of the upper and lower end openings provided in the machine frame and the upper end of the bottomed outer cylinder on a common central axis by an annular partition plate. And a communication interval formed between the lower end of the inner cylinder and the bottom plate of the bottomed outer cylinder,
A plurality of rotating blades rotating around the central axis along the upper surface of the bottom plate are provided, and the tips of these rotating blades are connected to a rotating wheel provided along the inner peripheral surface of the bottomed outer cylinder. A plurality of feed claws directed inward to the rotating wheel,
In addition, in the granular material feeder, a supply port is opened in the bottom plate of the annular passage, and an inflow prevention plate to the supply port is provided at the lower end of the inner cylinder corresponding to the supply port.
The inner cylinder is formed into an inverted conical shape to form an inverted conical inner cylinder, and the outer surface of the inner cylinder is formed in an inverted conical shape with a downward slope toward the center of the inner cylinder, and the downward inclined outer surface and the bottomed surface The upper end of the outer cylinder is integrally connected to the common center line by the annular diaphragm,
A short cylinder is provided at the lower end of the inverted conical inner cylinder, the flow interval is formed at the lower end of the short cylinder, and the inflow blocking plate is provided at the lower end of the short cylinder corresponding to the supply port,
The entire inner surface of the inverted conical inner cylinder , the inflow blocking plate and the entire inner surface of the short cylinder are subjected to a net-like cured overlay welding ,
A descending guidance device for a powder and particle feeder, in which a net-like cured overlay welding is performed on substantially the entire upper surface of the rotary blade . The descending guidance apparatus in the granular material supply machine according to claim 1, wherein the build-up welding centering on the central axis is performed on the upper surface of the boss portion of the rotary blade . The descending induction device for a powder and particle feeder according to claim 2, wherein the hardfacing welding of the upper surface of the boss part is radial hardfacing welding .

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