JP2019168189A - Grate bar for pallet truck of sintering machine - Google Patents

Abstract

To provide a grate bar for a pallet truck of a sintering machine that is hard to break and does not easily drop or crack ceramic parts.SOLUTION: The pallet truck grate bar 1 of the sintering machine according to the present invention is for forming a grate by being arranged in parallel on the support part of the sintering machine pallet truck, and comprises a metal core member 5 and a ceramic outer cover portion 7 covering the outside of the core member 5, and the volume of the core member 5 is set to be smaller than the volume of the jacket portion 7.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a great bar for a pallet truck of a sintering machine.

  A conventional pallet cart great bar (hereinafter simply referred to as “Great bar”) of a sintering machine is made of Hi-Cr cast iron, and iron ore powder is sintered with a pallet cart equipped with such a great bar. In order to protect the great bar, the sintered ore product (iron ore) that had been sintered once was spread on the sintered pallet as a floor covering to a certain thickness.

In the case of using the bedding ore, it is necessary to arrange the belt conveyor used for the production of the bedding or the line, and it also causes a decrease in the yield of the sintered ore product.
Also, even if the floor mine is laid down, the top of the great bar is particularly hot, so the great bar is prone to breakage. There was a need to prevent outbreaks.

  With respect to these problems, Patent Documents 1 and 2 propose a great bar having a configuration in which a ceramic member is fitted on the top of a metal great bar body.

JP 59-212681 Japanese Utility Model Publication No. 62-38226

  In the case of a structure in which a ceramic member is fitted only on the top of a metal great bar body proposed in Patent Documents 1 and 2, the ceramic member is dropped due to the difference in thermal expansion coefficient between the metal member and the ceramic member. There was a concern that cracks would occur.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a pallet carriage great bar for a sintering machine that is less likely to break and is less likely to drop off or crack a ceramic member.

Porcelain members have high heat resistance and wear resistance, and if the entire great bar is formed of porcelain members, they have excellent properties in these respects, but the porcelain members have the disadvantage of being easily broken by impact.
As a result of diligent studies to compensate for this drawback, a metal core member is provided inside for the purpose of preventing cracking due to impact, and the volume ratio thereof is reversed by making the volume smaller than that of the ceramic jacket. Compared to the case of the above, the ratio of the volume that increases / decreases due to the thermal expansion / contraction of the metal member with respect to the total volume of the great bar is reduced, and the ceramic member is prevented from dropping or cracking due to the thermal expansion / contraction of the metal member I got the knowledge that I can.
The present invention is based on such knowledge, and specifically has the following configuration.

(1) A pallet cart great bar for a sintering machine according to the present invention is for forming a grate by being arranged in parallel on a support part of a pallet carriage for a sintering machine,
It is provided with a metal core member and a ceramic jacket portion covering the outside of the core member, and the volume of the core member is set smaller than the volume of the jacket portion. .

(2) Further, in the above (1), the core member is exposed from the jacket portion at a contact portion with the support portion of the pallet truck, and the core member is supported by the pallet truck. It is comprised so that it may contact with a part.

(3) Further, in the above-described (1) or (2), at least a part of the core member in the longitudinal direction is such that three surfaces of an upper surface, a front surface, and a rear surface are cross-sections orthogonal to the longitudinal direction. It is covered with a part.

The great bar for a pallet truck of the sintering machine according to the present invention includes a metal core member and a ceramic outer cover portion covering the outside of the core member, thereby preventing cracking of the outer cover portion due to impact. Can do.
This eliminates the need for flooring ore, and the need for a flooring line is not only effective in reducing running costs, equipment costs, and improving the yield of sintered ore products, but also in high-temperature environments. It is possible to prevent the damage of the great bar due to the occurrence of secondary damage such as tearing of the belt of the sintered ore product conveyor due to the fall of the great bar.
Further, by setting the volume of the core member smaller than the volume of the jacket portion, the ratio of the volume increasing / decreasing due to the thermal expansion / contraction of the metal core member with respect to the entire volume of the great bar is reduced, It is possible to prevent dropping or cracking of the ceramic outer casing due to the thermal expansion / contraction of the core member.

It is a front view of a great bar in an embodiment of the invention. It is arrow AA sectional drawing of FIG. It is a top view of the great bar in an embodiment of the invention. It is a side view of a great bar in an embodiment of the invention. It is explanatory drawing of the state which mounted the great bar of FIG. 1 on the support part of the pallet truck. FIG. 2 is a plan view of a state in which a plurality of the great bars of FIG. 1 are arranged and placed on a support portion of a pallet carriage. FIG. 2 is a side view of a state in which a plurality of the great bars of FIG. 1 are arranged and placed on a support portion of a pallet carriage.

A pallet cart great bar 1 (hereinafter simply referred to as “grate bar 1”) of a sintering machine according to an embodiment of the present invention is arranged in parallel on a support (see FIG. 5) of the pallet cart of the sintering machine. (Refer to FIG. 6) for forming a grate, and as shown in FIGS. 1 to 4, a metal core member 5 and a ceramic jacket portion 7 covering the outside of the core member 5. And is configured.
In the present embodiment, the support portion of the pallet truck includes a support member 3 provided on the pallet truck, and a heat insulating member 4 interposed between the support member 3 and the great bar 1. The heat insulating member 4 has a function of preventing the heat generated from the sintered ore on the great bar 1 from being directly transmitted to the support member 3 and damaging the support member 3.
The support member 3 has an H-shaped steel shape with a short flange, and the support member 3 is arranged in parallel along the longitudinal direction of the pallet carriage (a direction perpendicular to the traveling direction of the pallet carriage) on the pallet carriage. It is erected.
Each of the great bars 1 is bridged between adjacent support portions, and a large number of great bars 1 are arranged in parallel on the support portions of the pallet truck so as to form the bottom surface of the pallet truck.

<Coating>
The jacket portion 7 is made of ceramic (made of ceramic), and covers the entire peripheral surface of the core member 5 as understood from a cross section perpendicular to the longitudinal direction at the central portion in the longitudinal direction (see FIG. 2). ing.
Since the ceramic member has high heat resistance and wear resistance, forming the outer cover 7 with a ceramic member eliminates the need for flooring ore for metal grate bars. This line is unnecessary, and the yield of sintered ore products is improved. In order to protect the core member 5 from a high-temperature environment, it is preferable that the dimension in the height direction of the portion of the jacket portion 7 above the upper surface of the core member 5 is about 20 to 30 mm.
In addition, since the ceramic jacket portion 7 covers the metal core member 5, the temperature change of the core member 5 is suppressed and thermal expansion / shrinkage is relatively reduced, and the core member 5 is detached from the jacket portion 7. I don't have to.

  Convex portions 9 that protrude slightly outward are provided on both side surfaces of the jacket portion 7 (see FIG. 3). This is to provide a gap S between adjacent great bars 1 as shown in FIG. 6 when a plurality of great bars 1 are placed side by side. In addition, the state which looked at the state of FIG. 6 from the side is shown in FIG.

<Core member>
The core member 5 is made of a metal such as steel, and by disposing the core member 5, it is possible to prevent the jacket portion 7 from being cracked by an impact.
The core member 5 is arranged over the entire length in the longitudinal direction of the jacket portion 7 and is configured so that both end portions are placed on adjacent support portions, as indicated by hatching in FIG. 7 functions as a beam for supporting a bending load acting on the great bar 1 in a state where the sintered ore is placed on the plate 7. That is, the core member 5 has an effect of preventing the jacket portion 7 that is a ceramic member from being broken by a bending load.

  The volume of the core member 5 is set smaller than the volume of the jacket portion 7. By making the volume of the core member 5 smaller than that of the ceramic outer jacket portion 7, it is increased or decreased by thermal expansion / contraction of the core member 5 with respect to the entire volume of the great bar 1 as compared with the case where the volume ratio of both is reversed. The ratio of the volume is reduced, so that the ceramic outer cover part 7 can be prevented from falling off and cracking due to the thermal expansion / contraction of the metal core member 5.

In addition, as for the core member 5, the contact part with the support part including the both ends is exposed from the jacket part 7, and the great bar 1 was mounted in the support part 3 of the pallet truck as shown in FIG. Sometimes, the core member 5 comes into contact with the support portion of the pallet truck.
Thereby, compared with the case where only the ceramic outer jacket part 7 contacts the support part of a pallet truck, the outer jacket part 7 is hard to be damaged.
The contact portion with the support portion in the present invention is not only a portion that is always in contact with the support portion, such as the lower surface of both end portions of the great bar 1, but is always in contact with the support portion by play between the great bar 1 and the support portion. It includes parts that are not exposed but may come into contact. In the latter contact portion, for example, the upper surface of the L-shaped portion respectively provided at the lower ends of both ends of the great bar 1, that is, when the pallet truck is transported in a state of being inverted upside down after discharging the sintered ore, In detail, the part etc. which contact the lower surface of the support part in the state of FIG.
In addition, the core member 5 may protrude from the jacket portion 7, or the core member 5 and the jacket portion 7 may be substantially flush, and when the great bar 1 is placed on the support portion, The core member 5 may be in contact with the support portion so that local force does not act on the jacket portion 7 from the pallet carriage side. However, in consideration of wear due to contact with the support portion over a long period of time, the core member 5 Is preferably protruded from the jacket portion 7.

  As shown in FIG. 2, the core member 5 has a vertically long shape in which the cross section perpendicular to the longitudinal direction is long in the vertical direction in the installed state. By adopting such a shape, the rigidity against the longitudinal load (bending load) is increased, the deformation when the load due to the sintered ore acts is reduced, and the core portion 7 is prevented from being damaged. The function as the member 5 can be exhibited more.

An outline of the manufacturing method of the great bar 1 of the present embodiment is as follows.
When a ceramic great bar is molded, a vaporizing material having the same shape as the core member 5 (a member that vaporizes during firing at a high temperature and creates a cavity inside the great bar) is placed inside. Thereby, the ceramic outer jacket part 7 in which the cavity is formed in the part where the core member 5 enters can be formed.
After the outer casing portion 7 of the ceramic great bar is formed, the core member 5 is inserted into the hollow portion formed by the vaporizing material.

In the great bar 1 of the present embodiment configured as described above, the outer cover portion due to impact is provided by including the metal core member 5 and the ceramic outer cover portion 7 that covers the outside of the core member 5. 7 can be prevented.
Further, since the volume of the core member 5 is set to be smaller than the volume of the jacket portion 7, the ratio of the volume that increases / decreases due to the thermal expansion / contraction of the metal core member 5 with respect to the entire volume of the great bar 1 decreases. In addition, it is possible to prevent the ceramic casing portion 7 from dropping or cracking due to the thermal expansion / contraction of the core member 5.
Further, when the great bar 1 is placed on the support part 3 of the pallet truck, the metal core member 5 comes into contact with the support part 3 of the pallet truck, so that only the ceramic jacket part 7 is provided. Compared to the case where the support portion 3 is contacted, the outer cover portion 7 is less likely to be damaged.

In the present embodiment, as shown in FIG. 2, the outer cover portion 7 covers the entire circumference of the core member 5 at the central portion in the longitudinal direction of the great bar 1, but a cross section orthogonal to the longitudinal direction. 3 may be configured such that the top surface, the front surface, and the back surface are covered with the jacket portion 7.
If these three surfaces are covered with the jacket portion 7, heat transfer to the core member 5 can be suppressed, and the effect of reducing the risk of cracking due to expansion of the core member 5 can be obtained.

DESCRIPTION OF SYMBOLS 1 Great bar for pallet trucks 3 Support part 5 Core member 7 Outer part 9 Convex part S

Claims (3)

A great bar for forming a grate by arranging in parallel on a support part of a pallet carriage of a sintering machine,
A metal core member, and a ceramic jacket covering the outside of the core member;
The pallet cart pallet cart great bar characterized in that the volume of the core member is set smaller than the volume of the jacket portion.   The core member is exposed from the jacket portion at a contact portion with the support portion of the pallet truck, and the core member is configured to contact the support portion of the pallet truck. A great bar for a pallet truck of the sintering machine according to claim 1.   The at least one part in the longitudinal direction of the said core member is covered with the said jacket part in the three surfaces of an upper surface, a front surface, and a back surface in the cross section orthogonal to the said longitudinal direction. Great bar for pallet truck of sintering machine.

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