JPH0616920Y2 - Strain raw material charging device sieve rod - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is a charging device for charging a sintering raw material into a pallet of a sintering machine when manufacturing a sintered ore used as a blast furnace charging raw material. The present invention relates to a bar material that constitutes a device screen.

[Prior Art] When manufacturing a sinter that is loaded into a blast furnace, approximately 10 mm
The following iron ore was mixed with coke having an appropriate particle size and limestone powder as needed, and after charging into a pallet of a sintering machine,
The coke on the surface is ignited, the coke is burned while sucking air downward, and the heat of combustion sinters the iron ore. In this sintering, since the sintering progresses by the combustion of coke, the supply of air to the raw material packed bed, that is, the air permeability of the raw material packed bed is a major factor that affects the operation.

In addition, when sintering with downward ventilation, if the sintering raw material and coke are distributed with a uniform grain size in the height direction, due to the characteristics of heat transfer in the raw material packed bed, the temperature rises toward the lower layer and Resistance increases. Therefore, in the surface layer portion of the raw material-filled layer, defective sintering occurs due to insufficient temperature rise, and in the lower layer portion, defects such as melting and oversintering are likely to occur due to excessive heating.

Therefore, various proposals have been made to improve the particle size distribution, coke segregation and the like of the raw material packed layer so that each part of the raw material packed layer undergoes a uniform sintering reaction.

For example, the present applicant proposed the charging device shown in FIG. 4 in Japanese Patent Laid-Open No. 61-223136. This charging device 51 is provided with a large number of rod members 53 extending in the pallet advancing direction above a pallet 52 of a sintering machine, and at least the lower side of these rod members 53 is arranged in a staggered manner. The sintering raw material 54 charged into the pallet 52 is cut out from the hopper 55, the drum feeder 56, and the inclined plate 57. Then, the sintering raw material 54, which has slid on the inclined plate 57, passes through the sieve constituted by the rods 53 and is loaded on the pallet 52 as a raw material filling layer 58.

At this time, since the lower side of the bar 53 is stepped,
The mutual interval between the rods 53 is wider toward the tip. Therefore, of the sintering raw material 54 that has dropped onto the rod 53, the fine-grained portion falls from the base end side of the rod 53 to the pallet 52, and the coarse-grained portion falls from the tip end side of the rod 53. Therefore, on the entering pallet 52, classification charging is performed in which the lower layer is coarse particles and the upper layer is fine particles. Moreover, since the dropping energy of the sintering raw material 54 is alleviated by the rod material 53, the low density raw material filling layer 58 can be formed. In this way, the ideal raw material filling layer 58 having a small air flow resistance and a particle size segregation in which the particle size decreases from the lower layer to the upper layer is obtained.

[Problems to be solved by the device]

By the way, in the classification sieve used in the charging device 51, the rod 53 is exposed to the impact of the sintering raw material 54 falling from the inclined plate 57. Therefore, the upper surface of the bar 53 is particularly worn. For example, according to the results of use in a sintering machine having a capacity of 200 tons / hour / m, a rod made of stainless steel having an outer diameter of 13 mm is fractured after about 1 week due to abrasion. Therefore, it is necessary to constantly observe the worn state of the bar member 53 and frequently replace the bar member if the degree of wear exceeds the allowable value.

In order to reduce the frequency of replacement of the bar 53 due to this wear, it is not possible to eliminate the breakage of the bar 53 by simply using a material having excellent wear resistance as the bar 53. That is, the length of the rod 53 is usually about 0.5 to 1 m, and since the sintering raw material 54 falls here, it has high toughness so as to withstand the impact of the sintering raw material 54 that falls there. Things are needed. However, a material having excellent wear resistance and toughness is expensive, and it is not economical to use it as the bar member 53 which is supposed to be replaced.

In addition, the problem caused by the adherence of the sintering raw material 54 to the rod 53 also becomes large. As this attachment progresses, the effective spacing between the rods 53 changes, and the initial classification function is hindered.

Therefore, in the present invention, by improving the surface of the bar material, there is less wear, the adhesion of the sintering raw material falling from the inclined plate is reduced, and the sintering raw material is sintered with a consistent classification performance for a long period of time. Intended for loading on machine pallets.

[Means for Solving the Problems]

In order to achieve the purpose, the bar material for the sieve of the present invention is
In a rod material of a sintering raw material charging device for forming a sieve by a plurality of rods inclinedly arranged on a pallet of a sintering machine, dropping the sintering material on the sieve, and classifying and charging on the pallet, The bar material is made of carbon steel as a core material, and a hard coating made of metal is applied to the entire length surface.

This rod for frying has carbon steel as a core material and has a full length surface coated with a hard resin, or a ceramic ring divided into a plurality of pieces along the full length surface direction of the carbon steel core material is fitted into the carbon steel core material. Further, an elastic body may be interposed between the carbon steel core material and the ceramic ring.

[Action]

In the present invention, the surface of the rod material constituting the sieve is hard-coated with metal, lined with hard synthetic resin, or fitted with a ceramic ring. Further, as the core material, carbon steel having excellent toughness is used.

Examples of the hard cover made of metal include hard chrome and nickel-chrome. Further, electrolytic plating, plasma CVD, ion plating, sputtering or the like is adopted as the coating forming means. By this coating, the surface hardness of the rod is improved, and sufficient wear resistance against the drop impact of the sintering raw material is exhibited. Moreover, since the core material is carbon steel having excellent toughness, breakage is reduced. Further, since the portion where the hard coating is peeled off due to long-term use can be easily seen from the outside, it is possible to easily determine the replacement time of the bar.

On the other hand, in the case where the hard synthetic resin is lined, the impact of falling of the sintering raw material is absorbed by the elastic deformation of the lining, and the core material is protected. Moreover, the raw material particles adhering to the lining are automatically separated from the surface of the bar due to its elastic deformation. As a hard synthetic resin used for such a lining, there is an FRP type resin or the like.

Further, the ceramic ring is a material having excellent wear resistance, and the amount of the sintering raw material attached is small. Therefore, a constant classification effect can be maintained for a long period of time. Since the ceramic ring is divided and fitted in the longitudinal direction of the bar, it can be easily replaced when it is damaged.

〔Example〕

Hereinafter, the features of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an example in which a hard chrome plating layer is formed on the surface of a bar as a hard skin made of metal. In this example, a carbon steel S55C wire having a diameter of 9 mm is used as the core material 1, and the core material 1 is electroplated in a plating bath of a chrome wire-sodium fluorosilicate-sulfuric acid system. Layer 2 was formed. Although depending on the electroplating conditions, this chrome-plated layer 2 is finished to have a surface roughness of a normal degree, so that the sintering raw material slides smoothly. In order to further improve the slipperiness, the chrome plating layer 2 may be buffed and polished.

The hardness of the formed chromium plating layer 2 is Hv900, which is sufficiently higher than the hardness (Hv180) of the core material 1. When this chrome-plated core material 1 is used as a bar material constituting a sieve surface, the life is extended by about 60 to 100 times as compared with the conventional carbon steel bar material. Further, since the smoothness of the surface is not lost, the raw material particles are less likely to be attached and deposited on the bar material. Moreover, this chrome plating layer 2
Has a gloss different from the surface gloss of the core material 1, and therefore the wear state of the bar material could be easily determined by observing the chromium plating layer 2 on the surface of the core material 1.

FIG. 2 shows a bar material having a hard synthetic resin lining. Also in this example, as the core material 1, a wire material of carbon steel S55C having a diameter of 9 mm was used. After chrome-plating the surface of the core material 1, a glass fiber reinforced epoxy FRP3 was fitted. This glass fiber reinforced epoxy FRP3 has some flexibility. The impact of the falling sintering raw material is absorbed by the glass fiber reinforced epoxy FRP 3 and is transmitted to the core material 1 as relaxed. Therefore, the wear of the bar material is extremely reduced. Even in this case, if the chromium plating layer 2 is formed on the surface of the core material 1, the wear resistance can be further improved.

In FIG. 2, the glass fiber reinforced epoxy FRP 3 is closely fitted to the core material 1. However, the glass fiber reinforced epoxy FRP3 can be fitted without being restricted by this so that a gap is formed between the glass fiber reinforced epoxy FRP3 and the core material 1, for example. in this case,
Glass fiber reinforced epoxy F by falling impact of sintering raw material
Although RP3 is largely deformed, most of the impact energy is absorbed when the deformed glass fiber reinforced epoxy FRP3 reaches the surface of the core material 1. As a result, there is virtually no shock transmitted to the core material 1. In the example,
When the gap between the surface of the core material 1 and the glass fiber reinforced epoxy FRP 3 is opened by about 0.5 to 1 mm, the effect of extending the life by about 3 times as compared with the contact type was obtained.

FIG. 3 shows a bar member into which a ceramic ring is fitted.
The ceramic ring 4 is divided into a large number in the longitudinal direction of the core material 1. Then, the ceramic ring 4 is fitted and inserted into the core material 1 so that the respective divided pieces abut each other. A cushion material 5 is filled between the core material 1 and the ceramics ring 4 so that the falling impact of the sintering raw material received by the ceramics ring 4 is not absorbed and transmitted to the core material 1. The cushioning material 5 also prevents the ceramic ring 4 from being damaged or cracked due to a falling impact of the sintering raw material. In the embodiment, a rubber-based adhesive has a better performance than the epoxy resin.

As the ceramic ring 4, a ceramic having excellent wear resistance and toughness such as zirconia or sialon is used. Also, the surface of the ring produced by sintering these ceramics is extremely smooth, and the sliding of the sintering raw material is sufficient. Moreover, the tendency of the raw material particles to adhere becomes smaller than that on the metal surface. When the ceramic ring 4 is divided and fitted into the core material 1, the stress concentration on the individual divided pieces is reduced, and impact cracking can be suppressed.

A zirconia ceramic ring 4 was inserted into the core material 1 to form a sieve, and the sintering raw material was loaded into the pallet of the sintering machine. The life has been extended by a factor of three. In addition, adhesion of raw material particles
Since there was no accumulation, a stable classification action was maintained for a long period of time.

In the example described above, the core material 1 having the same cross-sectional area up to the tip is used. However, the present invention
The present invention is not limited to this, and it is also possible to use, for example, a tapered core material or rod material having a tapered tip. When such a tapered core material or rod material is used, the adhered / deposited raw material particles easily fall off from the tip of the rod material.

[Effect of device]

As described above, in the present invention, the life of the rod is extended and the number of replacements is reduced by providing the protective layer that protects the surface of the rod constituting the sieve from the drop impact of the sintering raw material. , The operation efficiency of the charging device is improved. Further, a hard coating, a lining of wear-resistant rubber or a hard synthetic resin, a ceramic ring, etc. improve the sliding of the sintering raw material and prevent the raw material particles from adhering to and depositing on the rod material. Further, since carbon steel having high toughness is used as the core material, breakage of the bar material is reduced. Therefore, the initial classification performance is not lost, and a raw material packed bed with ideal grain size segregation and coke segregation on the pallet of the sintering machine can be stably obtained for a long period of time, and high-quality sintered ore can be produced with good yield. You can

[Brief description of drawings]

1 shows a bar material having a chromium plating layer formed on the surface of a core material, FIG. 2 shows a bar material having a hard synthetic resin lining, and FIG. 3 shows a bar material fitted with a ceramic ring. On the other hand, FIG. 4 shows a state in which the pallet of the sintering raw material sintering machine is charged using the charging device previously proposed by the applicant. 1: Heart material 2: Hard film made of metal (chrome plating layer etc.) 3: Hard synthetic resin (glass fiber reinforced epoxy FRP)
Etc.) 4: Ceramic ring 5: Cushion material 51: Charging device, 52: Pallet 53: Bar material, 54: Sintering raw material 55: Hopper, 56: Drum feeder 57: Inclined plate, 58: Raw material filling layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masami Fujimoto Inventor Masami Fujimoto, 1-1-1, Emitsu, Hachimanto-ku, Kitakyushu, Fukuoka (72) Inventor, Tadahiro Inazumi, Kitakyushu, Fukuoka 1-1-1, Emitsu, Hachiman-to-ku, Higashi-ku Shin-Nippon Steel Co., Ltd. 3rd Technical Research Institute (72) Yoshinobu Suemura 1-1-1, Emitsu-Emitsu, Nikko, Hachiman-to-ku, Kitakyushu, Kitakyushu, Fukuoka Inside the Yawata Works (72) Keiichi Nakamura 1 No. 1 Tsukiko Yawatacho, Sakai City, Osaka Prefecture Shin Nippon Steel Co., Ltd. Inside the Sakai Works (56) Reference JP-A-1-310292 (JP, A)

Claims (3)

[Scope of utility model registration request] 1. A flue is constructed by a plurality of rods (53) inclinedly arranged on a pallet (52) of a sintering machine, and a sinter material (54) is dropped onto the flue to produce the pallet (52). In the bar material (53) of the sintering raw material charging device (51) to be classified and charged above, the bar material
(53) is a bar material for a sieve of a sintering material charging device, characterized in that carbon steel is used as a core material (1) and a hard coating made of metal is applied to the entire length surface. 2. A pallet (52) is constructed by arranging a plurality of rods (53) inclinedly arranged on a pallet (52) of a sintering machine and dropping a sinter material (54) onto the flue. In the bar material (53) of the sintering raw material charging device (51) to be classified and charged above, the bar material
(53) uses carbon steel as the core material (1) and has a hard synthetic resin on the entire length surface.
A rod material for a sieve of a sintering raw material charging device, which is lined in (3). 3. A pallet (52) comprising a plurality of rods (53) inclinedly arranged on a pallet (52) of a sintering machine to form a sieve, and dropping the sintered material (54) onto the sieve. In the bar material (53) of the sintering raw material charging device (51) to be classified and charged above, the bar material
(53) is inserted into the carbon steel core material (1) a ceramics ring (4) divided into a plurality along the longitudinal direction of the carbon steel core material (1), and the carbon steel core material (1) and the ceramics A rod material for a sieve, wherein an elastic body (5) is interposed between the ring (4) and the ring (4).