WO2010119988A1 - 焼結機 - Google Patents
焼結機 Download PDFInfo
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- WO2010119988A1 WO2010119988A1 PCT/JP2010/057191 JP2010057191W WO2010119988A1 WO 2010119988 A1 WO2010119988 A1 WO 2010119988A1 JP 2010057191 W JP2010057191 W JP 2010057191W WO 2010119988 A1 WO2010119988 A1 WO 2010119988A1
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- WIPO (PCT)
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- width
- stand
- sinter cake
- thick
- cake support
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
- F27B21/06—Endless-strand sintering machines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
- F27B21/02—Sintering grates or tables
Definitions
- the present invention relates to a sintering machine for producing sintered ore used as a raw material in a blast furnace or the like.
- sintered ore is often used as a raw material.
- This sintered ore is prepared by charging a sintering raw material containing fine iron ore, which is the main raw material, into a sintering pallet, and then igniting the surface coke of the sintering raw material layer from below the sintering raw material layer. Coke is burned while sucking air, and the sintering raw material layer is sequentially sintered from the upper layer to the lower layer with this combustion heat. And after discharging the sintered ore from the discharge part of the sintering pallet, the sintered ore is supplied to the blast furnace and used.
- the upper layer portion of the sintering raw material layer is sintered before the lower layer portion to become a sintered mass (hereinafter also referred to as a sinter cake), and as the sintering proceeds,
- the lower layer part of the sintering raw material layer is compressed by the weight of the sinter cake and becomes high density. For this reason, a reduction in combustion rate and uneven sintering have occurred due to the densification of the lower layer portion of the sintering material layer.
- a plate-like sinter cake support stand (hereinafter also simply referred to as a stand) that receives the weight of the sinter cake is erected on the sintering pallet truck so as to be buried in the sintering raw material layer. Sintering machines are disclosed. Note that the stand has its front-rear direction (width direction) aligned with the traveling direction of the pallet truck.
- the stand since the stand has a plate shape, wear has progressed remarkably in both the front and rear sides of the stand and the upper region following the stand. Specifically, the upper part of the stand is worn by rubbing against the supplied sintering raw material, and the sintered ore falling from the pallet when the sintered pallet is rotated to discharge the sintered ore. The front side portion of the stand is worn and the rear side portion is worn by collision of the sintered ore discharged from the subsequent pallet truck immediately after passing through the discharge portion of the sintered ore.
- Patent Document 2 as a countermeasure against the wear, the ridge line portion and the side surface portion from the front side portion to the rear side portion of the stand and the side surface portion thereof are subjected to wear-resistant build-up welding, not only suppressing the wear but also wearing and reaching the life. Even if only the upper blade part can be replaced, a structure has been proposed in which the stand is divided into the upper blade part and the lower pedestal part. However, this method increases the manufacturing cost of the stand, and is not a good solution from the viewpoint of sintering manufacturing cost.
- the present invention has been made in view of such circumstances, and it is an object to provide a sintering machine capable of prolonging the service life of a sinter cake support stand, having good maintainability, and as a result, capable of reducing sintering production costs. To do.
- a lower suction type sintering machine in which a plate-like sinter cake support stand is erected on each pallet truck constituting the sintering pallet, and the two sides before and after the sinter cake support stand In the upper region, a thick portion that is more than 1 and 1.5 times or less the thickness of the center portion in the front-rear direction of the sinter cake support stand is provided, and a plurality of the sinter cake support stands are provided on one pallet carriage ,
- the width a of the thick portion on the front side of the sinter cake support stand arranged on the most downstream side on the pallet cart is
- the width c of the thick part on the rear side of the sinter cake support stand which is longer than the width b of the thick part and arranged on the most upstream side on the pallet carriage, is the thickness of the thick part on the front side. Longer than width d Sintering machine also characterized in that the width dimension a, the ratio a /
- the thick part is characterized in that both sides in the thickness direction of each sinter cake support stand are provided so as to protrude from the surface of the center part in the front-rear direction of each sinter cake support stand (1) The sintering machine described.
- the sintering machine according to the present invention is provided with thick portions thicker than the thickness of the center portion in the front-rear direction in the front and rear side portions of the sinter cake support stand and the upper region following the sinter cake support stand. It is possible to suppress a decrease in life due to wear of the part.
- the width a of the front thick part of the most downstream stand on each pallet truck is Since it is longer than the width b of the rear thick part of the stand, the width of the thick part of the front part that is easily worn when passing through the sintered ore staying in the discharge part of the sintering pallet is sufficiently large. It is secured.
- the width c of the rear thick part of the most upstream stand is made longer than the width d of the front thick part of the stand so that it collides with the sintered ore discharged from the subsequent stand.
- the width of the thick portion of the rear side portion that is easily worn and secured is sufficiently secured.
- the front side thick wall with respect to the width length b of the rear side thick wall portion of the most downstream stand The width a of the rear portion and the width c of the rear thick portion relative to the width d of the front thick portion of the most upstream stand can be easily set to appropriate lengths.
- FIG. 1 is a perspective view of a sintering machine according to an embodiment of the present invention.
- 2A and 2B are a perspective view and a side view, respectively, of a sinter cake support stand used in the sintering machine.
- FIG. 3 is an explanatory view showing the relationship between the width a length ratio a / b of the thick part before and after the sinter cake support stand and the lifetime.
- 4A and 4B are a perspective view and a side view, respectively, of a sinter cake support stand according to a first modification.
- 5A and 5B are a perspective view and a side view, respectively, of a sinter cake support stand according to a second modification.
- FIG. 6 shows the relationship between the thickness of the thick part of the support stand and the wear rate (mm / day).
- the sintering machine has a plate on the upstream side in the traveling direction on each pallet truck 11 constituting the sintering pallet 10.
- Shaped sintering cake support stands hereinafter also referred to simply as stands 12 and 13, a lower suction type sintering machine, and both sides of the front and rear of each stand 12 and 13 and the upper region following this Thick portions 16 and 17 thicker than the thicknesses of the front and rear center portions 14 and 15 of the stands 12 and 13 are provided.
- Each of the stands 12 and 13 is erected on the pallet cart 11 such that the front-rear direction thereof matches the traveling direction of the pallet cart 11. This will be described in detail below.
- the sintering machine has a sintering pallet 10 that is composed of a plurality of continuous pallet trucks 11 and is circulated and conveyed, and a sintering raw material layer ( By sucking air from below (not shown), the sintering raw material layer is conveyed from the upper layer to the lower layer and conveyed to the exhausting side, which is the downstream side.
- a plurality of (two in FIG. 1) stands 12 and 13 are arranged along the traveling direction of the pallet truck 11, and the stand 12 and the stand 13 on the upstream side are adjacent to each other.
- the side end portions are arranged close to each other and are erected.
- the side ends of the adjacent stand 12 and stand 13 may be in contact with each other or may have a slight gap.
- a stand row composed of a plurality of stands 12 and 13 arranged side by side along the traveling direction has a plurality of rows (for example, 3 in the width direction of the pallet carriage 11 (a direction perpendicular to the traveling direction)). ⁇ 6 rows (4 rows in FIG. 1) are arranged.
- the number of stands constituting each stand row may be three or four. In this case, the most downstream and most upstream stands on the pallet truck are the stands located at the foremost and rearmost portions of each stand row.
- the stand 12 arranged on the most downstream side protrudes on the pallet carriage 11 and the shape of the upper end is viewed from the side. It has a round-shaped support portion 18 and an attachment portion 19 provided at the lower portion of the support portion 18 and fitted into the pallet carriage 11.
- the stand 12 has a symmetrical shape with respect to the surface at the center in the thickness direction.
- the stand 13 arranged on the most upstream side has the same configuration as the stand 12, and the stand 13 is attached to the pallet carriage 11 by inverting the stand 12.
- the height of the support portion 18 of the stand 12 is about 0.3 to 0.7 times the height embedded in the sintering raw material layer inserted on the pallet carriage 11, that is, the height of the sintering raw material layer (for example, If the height of the sintering raw material layer is about 800 mm, the height H of the support portion 18 is about 240 to 560 mm.
- the thickness T2 is preferably thicker than the thickness T1 of the center portion of the support portion 18 (region 14 in FIGS. 2A and 2B) and 1.5 times or less of T1. Specifically, for example, since T1 is about 20 mm or more and 80 mm or less, T2 has a thickness of about 20 mm to 120 mm. When the thickness T2 of the thick part 16 is thicker than the central part thickness T1, the progress of wear of the thick part 16 can be suppressed. FIG.
- the thickness T2 of the thick portion 16 of the support stand shows the relationship between the thickness T2 of the thick portion 16 of the support stand and the wear rate (mm / day) when a stand having a center thickness T1 of 40 mm is used for about one year. It can be seen that the wear rate decreases as the thick portion 16 becomes thicker. However, when the ratio (T2 / T1) of the thickness T2 of the thick part to the central part thickness T1 exceeds 1.5, the solidified sintered ore is caught by the thick part 16 when discharging the fired sintered ore. May interfere with discharge. In consideration of the stability of the discharge of the sintered ore, the thickness T2 of the thick portion 16 is thicker than the central portion thickness T1, and the lower limit is more than 1.0 times, preferably 1.1 times, and the upper limit is 1.5. Double, preferably 1.4 times.
- the thick portion 16 may have the same thickness in the vertical direction, but preferably has a taper such that the thickness becomes thinner as it goes upward.
- the taper has a difference of 1 to 1 between the uppermost portion and the lowest portion. It is preferable to be about 10 mm. This is because by having the taper, the solidified sintered ore is easily separated from the stand. Also, the reason why the difference in thickness is 10 mm or less is that if the taper is further increased, the thickness of the upper portion becomes too thin, and the thinning due to wear increases. Further, the thick portion 16 is provided with both surfaces in the thickness direction of the support portion 18 protruding from the surface of the central portion 14 of the support portion 18 by the same thickness. Thereby, it can suppress that the one side of the thickness direction of the stand 12 wears unilaterally.
- the width a of the front thick part is set to be greater than the width b of the rear thick part (for example, about 10 mm or more and 40 mm or less). Lengthen.
- the width c of the rear thick part is set to the width d of the front thick part (for example, 10 mm to 40 mm). Or less)
- the widths a to d of the thick parts 16 and 17 are the lengths in the front-rear direction of the thick parts 16 and 17 parallel to the floor surface 20 of the pallet carriage 11, and are the heights of the stands 12 and 13, respectively. The width at the 1/2 position.
- the width e in the height direction of the thick portions 16 and 17 on the tops of the stands 12 and 13 becomes longer toward the center in the front-rear direction of the support portion 18. That is, the width length e is a length equal to or longer than the width lengths a, b, c, and d.
- the width of the thick portion is defined by the thickness of the thick portion on the rear side of the stand 12 located on the center side of the stand row formed between the adjacent stand 12 and the stand 13 and the stand 13. This is because the front thick part is slower in wear than the thick part on the front side of the stand 12 and the thick part on the rear side of the stand 13.
- the ratio a / b of the width lengths a and b and the ratio c / d of the width lengths c and d are preferably in the range of 2 or more and 6 or less, respectively.
- the result of investigating the relationship between the ratio a / b of the width lengths a and b (the ratio c / d of the width lengths c and d) of the thick part on the front side and the rear side and the life of the stand is shown in FIG. This will be described with reference to FIG.
- the used stand has a round shape in the head portion, and the thickness dimensions thereof are the center part of the support part: 43 mm, the upper part of the thick part: 48 mm, the front side of the thick part: 50 mm, the thickness The rear side of the meat part: 50 mm (that is, the thickness of the thick part is more than 1.0 times the thickness of the central part).
- the ratio a / b of the width a and b of the stand was adjusted by changing the width a of the thick part on the front side to 22 mm and variously changing the width a of the thick part on the front side.
- the width e of the upper thick part was set to 70 mm. From FIG. 3, it was confirmed that the life span of the stand can be extended to more than twice the normal life by setting the ratio a / b of the width lengths a and b to 2 or more.
- the width lengths a and c are too short. At this time, even if the thick portions b and d are sufficiently left, the remaining portions of the thick portions a and c are reduced by wear, and the life of the stand is shortened. On the other hand, when the length of the width length a with respect to the width length b and the length of the width length c with respect to the width length d exceed 6 times, the lengths of the width lengths a and c are too long, which increases the manufacturing cost of the stand. Invite.
- the ratio a / b of the width lengths a and b and the ratio c / d of the width lengths c and d are in the range of 2 or more and 6 or less, respectively. Also, even if a / b is 5 or more, the effect of extending the life does not change so much, so it is preferable to set the lower limit to 2 and the upper limit to 5.
- the stand 12 shown above (same for the stand 13) is manufactured by integrally casting the support portion 18 including the thick portion 16 and the attachment portion 19 with heat-resistant cast steel having the composition shown in Table 1.
- a sinter cake support stand (hereinafter simply referred to as a stand) 30 according to a first modification will be described with reference to FIGS. 4 (A) and 4 (B).
- the ratio a / b of the width lengths a and b and the ratio c / d of the width lengths c and d are in the range of 2 or more and 6 or less, respectively.
- the stand 30 has a trapezoidal support portion 31 protruding from the side of the pallet cart 11 and a mounting portion 19 provided at the lower portion of the support portion 31 and fitted into the pallet cart 11.
- the stand 30 has a width e in the height direction of the upper thick portion 32 among the thick portions 32 provided on both the front and rear sides of the support portion 31 and the upper region following the support portion 31.
- the configuration is the same as that of the above-described stand 12 except that it is the same in the front-rear direction.
- the width a of the thick portion 32 on the front side of the stand 30 disposed on the most downstream side is longer than the width b of the thick portion 32 on the rear side, and
- the width c of the thick portion 32 on the rear side of the stand 30 arranged on the most upstream side is made longer than the width length d of the thick portion 32 on the front side (FIGS. 1, 2A, ( B)).
- the stand 35 has a support portion 36 that protrudes from the pallet carriage 11 and has a round upper end shape when viewed from the side, and a mounting portion 19 that is provided below the support portion 36 and is fitted into the pallet carriage 11. is doing.
- This stand 35 has a width length a of the thick portion 37 on the front side of the stand 35 arranged on the most downstream side among the thick portions 37 provided on both the front and rear sides of the support portion 36 and the upper region following the support portion 36.
- the width c ′ of the thick part 37 on the rear side of the stand 35 arranged on the most upstream side are as described above except that the width is gradually narrowed from the upper side to the lower side of the support part 36.
- the configuration is the same as that of the stand 12.
- the width of the upper end position of the front thick part 37 is 2a ′
- the width of the lower end position is a ′ / 2
- the width of the upper end position of the rear thick part 37 is 2c ′.
- the width at the lower end position is c ′ / 2.
- the ratio a ′ / b of the width lengths a ′ and b and the ratio c ′ / d of the width lengths c ′ and d are in the range of 2 or more and 6 or less, respectively.
- the width length ratio a ′ / b and the ratio c ′ / d are defined at an intermediate position in the height direction of the support portion 36.
- the width a ′ of the thick portion 37 on the front side of the stand 35 disposed on the most downstream side is longer than the width b of the thick portion 37 on the rear side
- the width c ′ of the thick portion 37 on the rear side of the stand 35 disposed on the most upstream side is set to be longer than the width d of the thick portion 37 on the front side.
- each pallet truck has four stands arranged adjacent to each other in the traveling direction of the pallet truck with a distance in the width direction of the pallet truck.
- the height H of each stand is 400 mm.
- Table 2 shows the shape and thickness of the stand used, the width and ratio of each part of the thick part, and the life of the stand used.
- the round shape described in the shape in Table 2 is a stand having a round upper end as shown in FIGS. 2A and 2B
- the trapezoid is the shape shown in FIG.
- (B) is a stand having a flat upper end. The life was evaluated as the wear limit when 50 mm was worn in the height direction of the stand.
- a thick part is provided on the stand.
- the thickness T2 of the thick portion satisfies the condition of more than 1 time and 1.5 times or less of the thickness T1 of the central portion.
- the width length ratios a / b and c / d of the thick portion also satisfy the conditions of 2 or more and 6 or less. With this configuration, it was confirmed that the life of the stand could be extended (1500 days or longer).
- Comparative Examples 1 and 3 the thickness dimension of the thick part of the stand is set to the same condition as in Examples 1, 3, and 4, but the ratio of the width of the thick part is 1, and the above-described conditions Is less than the lower limit (less than 2). Note that Comparative Example 1 and Comparative Example 3 differ only in the shape of the stand. For this reason, the front side and the rear side of the stand were worn, and the lifetime was shorter than that of Examples 1 to 4 (Comparative Example 1: 730 days, Comparative Example 3: 750 days). In Comparative Example 2, the ratio of the width and length of the thick part of the stand satisfies the condition of 2 or more and 6 or less (width / length ratio 2.4).
- Table 2 also shows a conventional stand that is not provided with a thick portion.
- the stand of the conventional example has a very short life (600 days) because the front side and the back side of the stand are worn out. From the above, it was confirmed that by using the sintering machine of the present invention, it was possible to extend the life of the sinter cake support stand, and to reduce the labor required for replacing the stand and the cost for sintering production.
- the present invention has been described with reference to the embodiment.
- the present invention is not limited to the configuration described in the above embodiment, and the matters described in the scope of claims.
- Other embodiments and modifications conceivable within the scope are also included.
- the case where the sintering machine of the present invention is configured by combining a part or all of the above-described embodiments and modifications is also included in the scope of the right of the present invention.
- the case where the same shape is used for the most downstream stand and the most upstream stand on each pallet truck has been described.
- the stand 12 is arranged on the most downstream side on each pallet carriage, the stand 30 or the stand 35 is arranged on the most upstream side, the stand 30 is arranged on the most downstream side, and the stand 13 or 35 is arranged on the most upstream side.
- the stand 35 may be arranged on the most downstream side, the stand 13 or the stand 30 may be arranged on the most upstream side, or a combination of stands having different shapes may be used.
- the width of the thick part on the front side of the stand arranged on the most downstream side on each pallet carriage is longer than the width of the thick part on the rear side of the stand arranged on the most upstream side. Further, by selecting a stand provided on each pallet truck, it is possible to mount according to the progress of wear.
- the present invention can be used in an iron ore raw material sintering machine in steel production.
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Abstract
Description
そこで、例えば、特許文献1には、シンターケーキの重みを受ける板状のシンターケーキ支持スタンド(以下、単にスタンドともいう)を、焼結原料層に埋没するように焼結パレット台車に立設させた焼結機が開示されている。なお、スタンドは、その前後方向(幅方向)をパレット台車の進行方向に合わせている。
このように、スタンドの前側部と後側部での摩耗が進行すると、徐々にシンターケーキを支えられなくなるだけでなく、スタンドを頻繁に新品に交換する必要があり、その結果、メンテナンス性が悪化し、焼結製造コストが大幅に増加する。
しかし、この方法ではスタンドの製造費用が高くなり、焼結製造コストの観点から得策ではない。
(1)焼結パレットを構成する各パレット台車上に板状のシンターケーキ支持スタンドを立設した下方吸引式の焼結機であって、前記シンターケーキ支持スタンドの前後の両側部及びこれに続く上部の領域に、該シンターケーキ支持スタンドの前後方向中央部の厚みの1倍超1.5倍以下の厚肉部が設けられ、かつ1台の前記パレット台車上に複数の前記シンターケーキ支持スタンドを該パレット台車の進行方向に沿って並べて立設した際に、該パレット台車上の最下流側に配置された前記シンターケーキ支持スタンドの前側の前記厚肉部の幅長aが、後側の該厚肉部の幅長bより長く、かつ前記パレット台車上の最上流側に配置された前記シンターケーキ支持スタンドの後側の前記厚肉部の幅長cが、前側の該厚肉部の幅長dより長く、しかも前記幅長a、bの比a/bと前記幅長c、dの比c/dがそれぞれ2以上6以下の範囲内であることを特徴とする焼結機。
特に、1台のパレット台車上に複数のスタンドをパレット台車の進行方向に沿って並べて立設した際に、各パレット台車上の最下流側のスタンドの前側厚肉部の幅長aを、そのスタンドの後側厚肉部の幅長bより長くするので、焼結パレットの排出部に滞留した焼結鉱の中を通過する際に摩耗し易い前側部の厚肉部の幅長を充分に確保されている。
また同様に、最上流側のスタンドの後側厚肉部の幅長cを、そのスタンドの前側厚肉部の幅長dより長くすることで、後続するスタンドから排出された焼結鉱に衝突され摩耗し易い後側部の厚肉部の幅長も充分に確保されている。
更に、幅長a、bの比a/bと幅長c、dの比c/dを、それぞれ規定することで、最下流側のスタンドの後側厚肉部の幅長bに対する前側厚肉部の幅長aと、最上流側のスタンドの前側厚肉部の幅長dに対する後側厚肉部の幅長cを、それぞれ適正な長さに容易に設定することができる。
これにより、各スタンドの寿命が、最下流側のスタンドの前側厚肉部と最上流側のスタンドの後側厚肉部の摩耗に依存することを抑制し、防止できる。
従って、シンターケーキ支持スタンドの長寿命化が図れ、スタンドの交換に要する手間や焼結製造コストの低減が図れる焼結機を提供できる。
図2は、(A)、(B)はそれぞれ同焼結機に使用したシンターケーキ支持スタンドの斜視図、側面図である。
図3は、シンターケーキ支持スタンドの前後の厚肉部の幅長の比a/bと寿命との関係を示す説明図である。
図4は、(A)、(B)はそれぞれ第1の変形例に係るシンターケーキ支持スタンドの斜視図、側面図である。
図5は、(A)、(B)はそれぞれ第2の変形例に係るシンターケーキ支持スタンドの斜視図、側面図である。
図6は、支持スタンドの厚肉部の厚みと摩耗速度(mm/日)の関係を示す。
図1、図2(A)、(B)に示すように、本発明の一実施の形態に係る焼結機は、焼結パレット10を構成する各パレット台車11上の進行方向上流側に板状のシンターケーキ支持スタンド(以下、単にスタンドともいう)12、13を立設した下方吸引式の焼結機であり、各スタンド12、13の前後の両側部及びこれに続く上部の領域には、スタンド12、13の前後方向中央部14、15の厚みより厚い厚肉部16、17が設けられている。なお、各スタンド12、13は、パレット台車11上に、その前後方向をパレット台車11の進行方向に合わせて立設されている。以下、詳しく説明する。
各パレット台車11上には、複数(図1では2個)のスタンド12、13が、パレット台車11の進行方向に沿って並べられており、スタンド12とその上流側のスタンド13が、隣合う側端部を近接配置させて立設されている。この隣合うスタンド12とスタンド13の側端部は、当接してもよく、また僅少の隙間を有してもよい。
なお、各スタンド列を構成するスタンドの個数は、3個又は4個でもよい。この場合、パレット台車上の最下流側と最上流側のスタンドは、各スタンド列の最前部と最後部に位置するスタンドとなる。
スタンド12の支持部18の高さは、パレット台車11上に装入される焼結原料層に埋没する高さ、即ち焼結原料層の高さの0.3~0.7倍程度(例えば、焼結原料層の高さが800mm程度であれば、支持部18の高さHが240~560mm程度)である。
厚肉部16の厚みT2を、中央部厚みT1より厚くすると、厚肉部16の摩耗の進行を抑えることができる。図6に、中央部厚みT1が40mmのスタンドを約1年間使用したときの、支持スタンドの厚肉部16の厚みT2と摩耗速度(mm/日)の関係を示す。厚肉部16が厚くなるほど摩耗速度が減少することがわかる。しかし、厚肉部の厚みT2と中央部厚みT1の比(T2/T1)が1.5を超えると焼成した焼結鉱を排出する際に、固化した焼結鉱が厚肉部16に引っ掛かって排出に支障をきたす恐れがある。
焼結鉱の排鉱の安定性を考慮して、厚肉部16の厚みT2は、中央部厚みT1より厚く、下限を1.0倍超、好ましくは1.1倍、上限を1.5倍、好ましくは1.4倍にするのがよい。
また、厚肉部16は、支持部18の厚み方向の両面を、支持部18の中央部14の表面よりも、同じ厚みだけ突出させて設けている。これにより、スタンド12の厚み方向の片側が一方的に摩耗することを抑制できる。
このスタンド12、13の上部の厚肉部16、17の高さ方向の幅長eは、支持部18の前後方向中央部にかけて長くなっている。すなわち、幅長eは幅長a、b、c、dの長さ以上の長さである。
ここで、前側と後側の厚肉部の幅長a、bの比a/b(幅長c、dの比c/dも同様)とスタンドの寿命との関係を調査した結果を、図3を参照しながら説明する。なお、使用したスタンドは、その頭部の形状が丸形のものであり、その厚み寸法が、支持部の中央部:43mm、厚肉部の上部:48mm、厚肉部の前側:50mm、厚肉部の後側:50mm、のものである(つまり、厚肉部の厚みが、中央部の厚みの1.0倍超となっている)。このスタンドの幅長a、bの比a/bは、後側の厚肉部の幅長bを22mmにして、前側の厚肉部の幅長aを種々変化させることで調整した。なお、上部の厚肉部の幅長eを70mmとした。
図3から、幅長a、bの比a/bを2以上にすることで、スタンドの寿命を通常の2倍以上に延長することができることを確認した。
スタンド30は、パレット台車11上に突出する側面視して台形状の支持部31と、この支持部31の下部に設けられ、パレット台車11に嵌め込まれる取付け部19を有している。このスタンド30は、支持部31の前後の両側部及びこれに続く上部の領域に設けられた厚肉部32のうち、上部の厚肉部32の高さ方向の幅長eが、支持部31の前後方向に渡って同一であること以外は、前記したスタンド12と同様の構成である。
スタンド35は、パレット台車11上に突出する、上端部の形状が側面視して丸形状の支持部36と、この支持部36の下部に設けられ、パレット台車11に嵌め込まれる取付け部19を有している。このスタンド35は、支持部36の前後の両側部及びこれに続く上部の領域に設けられた厚肉部37のうち、最下流側に配置するスタンド35の前側の厚肉部37の幅長a´と、最上流側に配置するスタンド35の後側の厚肉部37の幅長c´を、支持部36の上側から下側へかけて徐々に幅狭にしていること以外は、前記したスタンド12と同様の構成である。なお、前側の厚肉部37の上端位置の幅長は2a´で、下端位置の幅長はa´/2であり、また後側の厚肉部37の上端位置の幅長は2c´で、下端位置の幅長はc´/2である。
なお、スタンド35をパレット台車11に取付けるに際しては、最下流側に配置されたスタンド35の前側の厚肉部37の幅長a´が、後側の厚肉部37の幅長bより長く、かつ最上流側に配置されたスタンド35の後側の厚肉部37の幅長c´が、前側の厚肉部37の幅長dより長くなるように行う。
このように、支持部36の厚肉部37の幅長を変えることで、摩耗し易い部位の厚肉部37の幅長を特に長くでき、スタンドの長寿命化が図れる。
まず、焼結条件について説明する。
焼結機の条件は、パレット台車の有効床面積:660m2、焼結原料の装入層厚:800mm、パレット台車の移動速度:3m/分、である。
また、各パレット台車には、それぞれパレット台車の進行方向に隣合う2個のスタンドを、パレット台車の幅方向に間隔を有して4列配置した。この各スタンドの高さHは、400mmである。
このため、スタンドの前側及び後側が摩耗して、その寿命が実施例1~4よりも短くなった(比較例1:730日、比較例3:750日)。
また、比較例2は、スタンドの厚肉部の幅長の比が2以上6以下の条件を満足している(幅長の比2.4)が、中央部の厚みT1に対する厚肉部の厚みT2の比が、厚肉部の上部で1.68(=47mm/28mm)、前側及び後側で1.79(=50mm/28mm)であり、前記した条件の上限値を超えている(1.5超)。このため、シンターケーキがスタンドに引っ掛かって、パレット台車から排出することが困難になる場合があり、安定した操業を実施できなかったため、操業を途中で中止した。
以上のことから、本発明の焼結機を使用することで、シンターケーキ支持スタンドの長寿命化が図れ、スタンドの交換に要する手間や焼結製造コストの低減が図れることを確認できた。
前記実施の形態においては、各パレット台車上の最下流側のスタンドと最上流側のスタンドに、同一形状のものを使用した場合について説明した。しかし、各パレット台車上の最下流側にスタンド12を、最上流側にスタンド30又はスタンド35をそれぞれ配置したり、また最下流側にスタンド30を、最上流側にスタンド13又はスタンド35をそれぞれ配置したり、更には、最下流側にスタンド35を、最上流側にスタンド13又はスタンド30をそれぞれ配置したり、異なる形状のスタンドを組合わせて使用してもよい。
このとき、各パレット台車上の最下流側に配置されるスタンドの前側の厚肉部の幅長が、最上流側に配置されるスタンドの後側の厚肉部の幅長よりも長くなるように、各パレット台車上に設けるスタンドを選択することで、摩耗の進行速度に応じた取付けができる。
11:パレット台車
12、13:シンターケーキ支持スタンド
14、15:中央部
16、17:厚肉部
18:支持部
19:取付け部
20:床面
30:シンターケーキ支持スタンド
31:支持部
32:厚肉部
35:シンターケーキ支持スタンド
36:支持部
37:厚肉部
Claims (6)
- 焼結パレット台車上にシンターケーキ支持スタンドを立設した下方吸引式の鉄鋼原料の焼結機において、
前記シンターケーキ支持スタンドの前記パレット台車進行方向の前後の両側部及びこれに続く上部の領域に、該シンターケーキ支持スタンドの前後方向中央部の厚みの1倍超1.5倍以下の厚肉部が設けられ、かつ1台の前記パレット台車上に複数の前記シンターケーキ支持スタンドを該パレット台車の進行方向に並べて立設した際に、前記シンターケーキ支持スタンドの側面視において、該パレット台車上の進行方向最下流側に配置された前記シンターケーキ支持スタンドの前側の前記厚肉部の幅である幅長aが、後側の厚肉部の該側面の幅である幅長bより長く、かつ前記パレット台車上の最上流側に配置された前記シンターケーキ支持スタンドの後側の前記厚肉部の幅長cが、前側の該厚肉部の幅長dより長く、かつ前記幅長a、bの比a/bと前記幅長c、dの比c/dがそれぞれ2以上6以下の範囲内であることを特徴とする焼結機。 - 前記厚肉部は、前記各シンターケーキ支持スタンドの厚み方向の両面を、該各シンターケーキ支持スタンドの前後方向中央部の表面よりも突出させて設けたことを特徴とする焼結機。
- 前記シンターケーキ支持スタンドの側面視の形状が、台形状であることを特徴とする請求項1に記載の焼結機。
- 前記シンターケーキ支持スタンドの側面視の形状が、上部が上に凸の曲線形状であることを特徴とする請求項1に記載の焼結機。
- 前記シンターケーキ支持スタンドの側面視において、前記シンターケーキ支持スタンドの少なくとも前後部どちらかの厚肉部の幅が、下方から上方に向け変化していることを特徴とする請求項1~4のいずれか1項に記載の焼結機。
- 前記厚肉部の幅の下方から上方の差が1mm~10mmであることを特徴とする請求項5に記載の焼結機。
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JP2002013876A (ja) * | 2000-06-29 | 2002-01-18 | Nippon Steel Corp | シンターケーキ支持スタンド、その製造方法及び補修方法 |
JP2006118769A (ja) * | 2004-10-20 | 2006-05-11 | Nippon Steel Corp | シンターケーキ支持スタンド |
JP2006329594A (ja) * | 2005-05-30 | 2006-12-07 | Nippon Steel Corp | シンターケーキ支持スタンド |
JP2007270170A (ja) * | 2006-03-30 | 2007-10-18 | Kurimoto Mec Ltd | シンターケーキ支持スタンド |
JP2010144946A (ja) * | 2008-12-16 | 2010-07-01 | Kurimoto Ltd | シンターケーキ支持スタンド |
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JP2006118769A (ja) * | 2004-10-20 | 2006-05-11 | Nippon Steel Corp | シンターケーキ支持スタンド |
JP2006329594A (ja) * | 2005-05-30 | 2006-12-07 | Nippon Steel Corp | シンターケーキ支持スタンド |
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JP5539384B2 (ja) * | 2010-03-19 | 2014-07-02 | 新日鐵住金株式会社 | シンターケーキ支持スタンド、肉盛溶接用ワイヤ及び肉盛溶接用金属 |
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