Sintering Pallet

Abstract

To suppress the positional deviation of stands with respect to support beams of a sintering pallet.SOLUTION: A sintering pallet 50 comprises a grate 60 to be loaded with raw material R of sintered ores and makes the raw material R sintered while conveying the same, and comprises: a plurality of support beams 54 arranged at intervals in a conveyance direction and supporting the grate 60; and stands 80 each having parts 82 to be engaged in which an engagement part 56P of the adjacent support beams 54 can be directly engaged in a vertical direction and holding the engagement part 56P at both end parts, bridged over the adjacent support beams 54 and projecting more upwardly than the grate 60, and the engagement part 56P is provided with a hardened build-up welding part 58.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a sintering pallet. [Background technology]

[0002] BACKGROUND ART There are sintering machines that produce sintered ore as a raw material for blast furnaces (see, for example, Patent Documents 1 and 2).

[0003] The sintering machine is equipped with a sintering pallet that transports the raw material for sintered ore, an ignition furnace that ignites the upper layer of the raw material loaded on the sintering pallet, and a suction device that sucks air downward from below the sintering pallet, sintering the raw material from the upper layer to the lower layer, and forming a sinter cake.

[0004] The sintering machine also includes a crushing guide that guides the sinter cake discharged from the sintering pallet, and a crusher that crushes the sinter cake guided by the crushing guide to form sintered ore.

[0005] The sintering pallet is provided with a stand. The stand protrudes upward from the grate of the sintering pallet on which the raw materials are loaded, and supports from below the upper part of the sinter cake formed on the upper layer of the raw materials. This ensures breathability of the lower layer of the raw materials, promoting combustion and sintering of the lower layer of the raw materials. When the sinter cake is discharged from the sintering pallet, the stand passes through a slit formed in the crushing guide. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 4-168234 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-179754 Summary of the Invention [Problem to be solved by the invention]

[0007] The stand is, for example, spanned across a plurality of support beams (frames) arranged at intervals in the conveying direction of the sintering pallet, and is attached to the engaging portions of these support beams so as to be engageable in the vertical direction.

[0008] However, when the engaging portion of the support beam wears, for example, the stand may tilt relative to the support beam, or the tilt of the stand relative to the support beam may increase, causing the stand to become misaligned relative to the support beam. When the stand becomes misaligned relative to the support beam, the stand may not pass through the slit in the crushing guide and may interfere with the crushing guide.

[0009] In consideration of the above, an object of the present invention is to prevent a stand from shifting in position relative to a support beam of a sintering pallet. [Means for solving the problem]

[0010] The sintering pallet described in claim 1 is a sintering pallet having a grate on which raw materials for sintered ore are loaded, and sintering the raw materials while transporting them, and is equipped with a plurality of support beams arranged at intervals in the transport direction and supporting the grate, and a stand that is bridged between the adjacent support beams and protrudes above the grate, and has engaging portions at both ends that hold the engaging portions, and the engaging portions are configured to be directly engageable in the vertical direction with each other.The sintering pallet is equipped with a wear prevention portion.

[0011] According to the sintering pallet of claim 1, the sintering pallet has a grate on which raw materials for sintering are loaded, and sinters the raw materials while transporting them. This sintering pallet has multiple support beams and stands. The multiple support beams are arranged at intervals in the transport direction of the sintering pallet and support the grate.

[0012] The stand is bridged between adjacent support beams and protrudes above the grate. The stand is capable of directly engaging with the engaging portions of the adjacent support beams in the vertical direction, and has engaged portions at both ends that hold the engaging portions.

[0013] Here, the engagement portion of the support beam is provided with a wear countermeasure portion. This wear countermeasure portion, for example, suppresses positional deviation such as tilting of the stand due to wear of the engagement portion. Therefore, interference of the stand with the crushing guide is suppressed.

[0014] A sintering pallet according to a second aspect of the present invention is the sintering pallet according to the first aspect, wherein the wear countermeasure portion is a wear resistant portion having higher wear resistance than the base material of the engaging portion.

[0015] According to the sintering pallet of claim 2, the wear countermeasure portion is a wear-resistant portion that is more wear-resistant than the base material of the engagement portion. This wear-resistant portion suppresses wear of the engagement portion. Therefore, displacement of the stand relative to the support beam is suppressed.

[0016] A sintering pallet according to a third aspect of the present invention is the sintering pallet according to the second aspect, wherein the wear-resistant portion is a hardfacing welded portion.

[0017] According to the sintering pallet of claim 3, the wear-resistant portion is a hardfacing welded portion. This hardfacing welded portion suppresses wear of the engaging portion. Therefore, displacement of the stand relative to the support beam is suppressed.

[0018] A sintering pallet according to a fourth aspect of the present invention is the sintering pallet according to the third aspect, wherein the hardfacing welded portion is provided in a recess formed in the surface of the base metal of the engaging portion.

[0019] According to the sintering pallet of claim 4, the hardfacing weld is provided in a recess formed in the surface of the base material of the engaging portion. The recess is formed by wear of the surface of the base material of the engaging portion, or is formed in advance in the surface of the base material of the engaging portion during the manufacture of the support beam. By providing the hardfacing weld in this recess, wear of the engaging portion can be suppressed without narrowing the vertical gap between the engaging portion and the engaged portion. Therefore, for example, a stand can be easily attached to the support beam.

[0020] A sintering pallet according to claim 5 is a sintering pallet according to claim 3 or claim 4, wherein the room temperature Vickers hardness Hv of the hardfacing welded portion is 20 or more times greater than the room temperature Vickers hardness Hv of the base material of the engaging portion.

[0021] According to the sintering pallet of claim 5, the room temperature Vickers hardness Hv of the hardfacing welded portion is 20 or more times greater than the room temperature Vickers hardness Hv of the base material of the engaging portion. This more reliably suppresses wear of the engaging portion. Therefore, displacement of the stand relative to the support beam is suppressed.

[0022] The sintering pallet described in claim 6 is the sintering pallet described in claim 2, wherein the wear-resistant portion is provided on the surface layer of the engagement portion and is a composite layer in which hard particles are dispersed in the base material of the engagement portion.

[0023] According to the sintering pallet of claim 6, the wear-resistant portion is a composite layer provided on the surface of the engagement portion. The composite layer is formed by dispersing hard particles in the base material of the surface layer of the engagement portion. This wear-resistant portion suppresses wear of the engagement portion. Therefore, displacement of the stand relative to the support beam is suppressed.

[0024] Furthermore, by providing a composite layer on the surface of the engaging portion, wear on the engaging portion can be suppressed without narrowing the vertical gap between the engaging portion and the engaged portion, making it easy to attach a stand to a support beam, for example.

[0025] A sintering pallet according to a seventh aspect of the present invention is the sintering pallet according to the first aspect, wherein the wear countermeasure portion is an overlay weld portion that protrudes in the vertical direction from the surface of the base material of the engaging portion.

[0026] According to the sintering pallet of claim 7, the wear countermeasure portion is a weld overlay portion that protrudes in the vertical direction from the surface of the base material of the engaging portion. This weld overlay portion makes the vertical gap between the engaging portion and the engaged portion narrower than a predetermined value. In other words, the weld overlay portion ensures a wear allowance. Therefore, displacement of the stand relative to the support beam is suppressed.

[0027] The sintering pallet described in claim 8 is a sintering pallet described in claim 7, wherein the longitudinal end of the support beam at the overlay weld portion is provided with an inclined surface that is inclined relative to the surface of the base material of the engagement portion when viewed from the side of the support beam.

[0028] According to the sintering pallet of claim 8, an inclined surface is provided at the longitudinal end of the support beam in the overlay weld portion. The inclined surface is inclined with respect to the surface of the base material of the engagement portion in a side view of the support beam.

[0029] As a result, for example, when the stand is slid along the longitudinal direction of the support beam and the engaging portion provided with the weld overlay is inserted into the engaged portion of the stand, the engaged portion slides along the inclined surface of the weld overlay. This makes it easier to insert the engaging portion provided with the weld overlay into the engaged portion of the stand. Therefore, the stand can be easily attached to the support beam.

[0030] The sintering pallet described in claim 9 is a sintering pallet described in claim 7 or claim 8, wherein the thickness of the buildup weld is set so that the vertical gap between the engaging portion and the engaged portion is 4 mm or less.

[0031] According to the sintering pallet of claim 9, the thickness of the overlay weld is set so that the gap between the engaging portion and the engaged portion in the vertical direction is 4 mm or less. As a result, in the present invention, it is possible to effectively and long-term suppress displacement of the stand relative to the support beam compared to when the gap between the engaging portion and the engaged portion in the vertical direction exceeds 4 mm. [Effects of the Invention]

[0032] As described above, according to the present invention, it is possible to suppress displacement of the stand relative to the support beams of the sintering pallet. [Brief explanation of the drawings]

[0033] [Figure 1] FIG. 1 is a side view showing a sintering machine equipped with a sintering pallet according to a first embodiment. [Figure 2] FIG. 2 is a rear view of the crushing guide shown in FIG. 1 as seen from the crusher side. [Figure 3] FIG. 2 is a perspective view showing the sintering pallet shown in FIG. 1. [Figure 4] FIG. 4 is a plan view showing the sintering pallet shown in FIG. 3. [Figure 5] 5 is a cross-sectional view taken along line 5-5 in FIG. 4. [Figure 6] FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. [Figure 7] FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 6. [Figure 8] FIG. 6 is a cross-sectional view corresponding to FIG. 5, showing a support beam and a stand of a sintering pallet according to a second embodiment. [Figure 9] 9 is a cross-sectional view taken along line 9-9 in FIG. 8. [Figure 10] FIG. 10 is a cross-sectional view taken along line 10-10 in FIG. 9. DETAILED DESCRIPTION OF THE INVENTION

[0034] (First embodiment) First, the first embodiment will be described.

[0035] (sintering machine) 1 shows a Dwight Lloyd type sintering machine 10 equipped with a sintering pallet 50 according to this embodiment. The sintering machine 10 produces sintered ore as a raw material for a blast furnace. The sintering machine 10 includes a pair of sprockets 12, 14, an endless rail 16, a plurality of sintering pallets 50, a floor hopper 22, a raw material charging hopper 24, an ignition furnace 30, a suction device 32, a crushing guide 42, and a crusher 46.

[0036] The pair of sprockets 12, 14 are arranged with a horizontal gap between them. An endless rail 16 is stretched across the pair of sprockets 12, 14. The endless rail 16 has an outgoing path portion 16A that is arranged above the pair of sprockets 12, 14, and a returning path portion 16B that is arranged below the pair of sprockets 12, 14.

[0037] A plurality of sintering pallets 50 connected in series are installed so as to be able to run on the endless rail 16. Then, as the pair of sprockets 12, 14 rotate in a predetermined direction, the plurality of sintering pallets 50 run (circulate) along the endless rail 16.

[0038] The side of one sprocket 12 is an ore supply section 20 that supplies raw material R for sintered ore to the sintering pallet 50. The ore supply section 20 is provided with a bedding hopper 22 and a raw material charging hopper 24. The bedding hopper 22 is provided above one sprocket 12. Sintered bed ore is supplied from this bedding hopper 22 onto each sintering pallet 50, and a bedding layer (not shown) is formed on the sintering pallet 50.

[0039] A raw material charging hopper 24 is provided downstream of the floor covering hopper 22. From this raw material charging hopper 24, raw material R is supplied onto the floor covering layer of each sintering pallet 50. An ignition furnace 30 is provided downstream of the raw material charging hopper 24. The ignition furnace 30 ignites the upper layer of the raw material R stacked in layers on the sintering pallet 50.

[0040] A suction device 32 is provided below the outgoing path portion 16A of the endless rail 16. The suction device 32 is provided along the outgoing path portion 16A and extends from the ignition furnace 30 to the other sprocket 14, and sucks air downward from below the sintering pallet 50.

[0041] This allows air to be supplied into the raw materials R ignited in the upper layer, accelerating the combustion of the raw materials R from the upper layer to the lower layer. As a result, the raw materials R on each sintering pallet 50 are sintered to form a sinter cake S. The sinter cake S is formed across multiple sintering pallets 50 connected in series.

[0042] The other sprocket 14 side is an ore discharge section 40 that discharges the sinter cake S made by sintering the raw material R on the sintering pallet 50. In this ore discharge section 40, the sintering pallet 50 descends along the outer periphery of the other sprocket 14. At this time, the interval between adjacent sintering pallets 50 widens, and the sinter cake S spanning these sintering pallets 50 is divided.

[0043] Then, the end of the sinter cake S on the sintering pallet 50 interferes with the upper part of the crushing guide 42 arranged diagonally below the other sprocket 14. As a result, the sinter cake S is peeled off from the sintering pallet 50 and falls onto the crushing guide 42.

[0044] The sinter cake S that has fallen onto the crushing guide 42 falls along the inclined portion of the crushing guide 42 and is guided to the crusher 46. The sinter cake S that has been guided to the crusher 46 is crushed by the crusher 46. As a result, sintered ore is formed.

[0045] Here, the sintering pallet 50 is provided with a plurality of stands 80, which will be described later. The plurality of stands 80 are embedded in the sinter cake S. Therefore, as shown in FIG. 2, a plurality of slits 44, through which the plurality of stands 80 pass, are formed in the upper part of the crushing guide 42.

[0046] (Sintering pallet) Next, the structure of the sintering pallet will be described in detail.

[0047] As shown in FIGS. 3 and 4, the sintering pallet (sintering pallet cart) 50 includes a base 52, a grate 60, a pair of side walls 70, and a plurality of stands 80.

[0048] The arrow X shown in each figure indicates the conveying direction of the sintering pallet 50. The arrow Y indicates the width direction of the sintering pallet 50, and the arrow Z indicates the up-down direction (height direction) of the sintering pallet 50.

[0049] 4, the base 52 is formed in a rectangular shape in a plan view. The base 52 has a plurality of support beams (frames) 54. The plurality of support beams 54 (four in this embodiment) are formed from cast steel or the like.

[0050] The multiple support beams 54 are arranged along the width direction (arrow Y direction) of the sintering pallet 50, and are also arranged at intervals in the conveying direction (arrow X direction) of the sintering pallet 50. Adjacent support beams 54 are connected by ribs (not shown). The grate 60 is supported by these support beams 54.

[0051] The grate 60 has a plurality of grate bars 62 arranged in a floor-like manner. The plurality of grate bars 62 are formed in a rod shape from cast steel or the like, and are arranged along the conveying direction of the sintering pallet 50. These grate bars 62 are bridged across the upper ends of adjacent support beams 54, and are arranged in the longitudinal direction of the support beams 54 (direction of arrow Y).

[0052] The upper surface of the grate 60 serves as a loading surface 60A on which the raw material R is loaded in layers. Gaps are formed between adjacent grate bars 62 in the longitudinal direction of the support beam 54. Air within the raw material R is sucked into the suction device 32 (see FIG. 1) through these gaps.

[0053] The pair of side walls 70 are formed into plates from cast steel or the like, and are arranged along the conveying direction of the sintering pallet 50. The pair of side walls 70 are provided on both sides of the base 52 in the width direction, and are connected to the ends of the multiple support beams 54.

[0054] 3, the pair of side walls 70 face each other in the width direction of the sintering pallet 50 and extend above the loading surface 60A of the grate 60. The pair of side walls 70 prevent the raw material R loaded on the loading surface 60A of the grate 60 from falling.

[0055] A plurality of wheels 72 are provided on the outer sides of the pair of side walls 70. The plurality of wheels 72 are configured to be able to run on an endless rail 16 (see FIG. 1).

[0056] The multiple stands 80 are formed into plate shapes from heat-resistant cast steel or the like, and are provided at the center and rear in the conveying direction of the sintering pallet 50. The multiple stands 80 are also arranged at intervals in the width direction of the sintering pallet 50.

[0057] 4, each stand 80 is arranged along the conveying direction of the sintering pallet 50 and is bridged over the upper ends of adjacent support beams 54. Furthermore, a plurality of stands 80 (two in this embodiment) are arranged in the conveying direction of the sintering pallet 50.

[0058] The arrangement and number of the stands 80 can be changed as appropriate.

[0059] 5, each stand 80 has a main body 80A and an attachment portion 80B integrally provided on the lower part of the main body 80A. The main body 80A is formed, for example, in a rectangular shape when viewed in the thickness direction.

[0060] 3, the main body 80A protrudes above the loading surface 60A of the grate 60 and is embedded in the raw material R loaded on the loading surface 60A. The main body 80A is also lower than the pair of sidewalls 70. The upper end of the main body 80A supports the upper part of the sinter cake S formed on the upper layer of the raw material R when the raw material R is sintered.

[0061] This prevents the weight (own weight) of the upper part of the sinter cake S from consolidating the lower layer of the raw material R thereunder. As a result, the breathability of the lower layer of the raw material R is ensured, and the combustion efficiency of the lower layer is improved.

[0062] 5, the mounting portion 80B is attached to the upper end portions of adjacent support beams 54. Specifically, the upper end portions of adjacent support beams 54 are formed with a T-shaped cross section. The upper end portions of the adjacent support beams 54 are provided with protrusions 56 that protrude toward each other.

[0063] That is, a protrusion 56 that protrudes toward the rear side in the transport direction of the sintering pallet 50 is provided at the upper end of the support beam 54 on the front side in the transport direction of the sintering pallet 50. On the other hand, a protrusion 56 that protrudes toward the front side in the transport direction of the sintering pallet 50 is provided at the upper end of the support beam 54 on the rear side in the transport direction of the sintering pallet 50.

[0064] As shown in Fig. 6, the protrusion 56 is provided on the upper end of the support beam 54 along the longitudinal direction (direction of arrow Y) of the support beam 54. Note that the grate bar 62 (grate 60) is not shown in Fig. 6.

[0065] 5, the mounting portion 80B is provided with a pair of engaged portions 82. The pair of engaged portions 82 are formed at the front end and rear end of the mounting portion 80B in the conveying direction (direction of arrow X) of the sintering pallet 50. When viewed from the thickness direction of the stand 80, the engaged portions 82 are recessed portions that are open on opposite sides.

[0066] That is, the engaged portion 82 formed at the front end of the mounting portion 80B is a recessed portion that is open on the front side in the conveying direction of the sintering pallet 50. On the other hand, the engaged portion 82 formed at the rear end of the mounting portion 80B is a recessed portion that is open on the rear side in the conveying direction of the sintering pallet 50.

[0067] The protruding portions 56 of the adjacent support beams 54 are inserted into the pair of engaged portions 82 so as to be engageable in the vertical direction. As shown in Fig. 6, of the protruding portions 56 extending in the longitudinal direction of the support beam 54, the portions that are inserted into the engaged portions 82 and engage (contact) with the engaged portions 82 in the vertical direction are referred to as engaging portions 56P.

[0068] 7, the upper inner wall surface of the engaged portion 82 is an upper engaged surface 82U with which the upper surface 56U of the engaging portion 56P directly engages in the vertical direction. The lower inner wall surface of the engaging portion 56P is a lower engaged surface 82L with which the lower surface 56L of the engaging portion 56P directly engages in the vertical direction.

[0069] When viewed from the thickness direction of the stand 80, the lower engaged surface 82L is shorter than the upper engaged surface 82U. The engaging portion 56P is held between the upper engaged surface 82U and the lower engaged surface 82L.

[0070] With the upper engaged surface 82U of the engaged portion 82 engaged (placed) on the upper surface 56U of the engaging portion 56P, a gap (play) G is formed between the lower surface 56L of the engaging portion 56P and the lower engaged surface 82L. By inserting the engaging portion 56P into this engaged portion 82, the mounting portion 80B of the stand 80 is attached to the adjacent support beam 54 so as to be relatively displaceable in the up and down direction.

[0071] In this embodiment, the engaging portion 56P of the support beam 54 is directly engaged in the vertical direction with the engaged portion 82 of the stand 80. "Direct engagement" here means, for example, that no insulation piece is interposed between the engaging portion 56P and the engaged portion 82. The insulation piece is a steel material that suppresses heat transfer from the stand 80 to the support beam 54.

[0072] Here, when attaching the stand 80 to adjacent support beams 54, the protrusions 56 at one end of the adjacent support beams 54 in the longitudinal direction are inserted into the pair of engaged portions 82 of the stand 80. In this state, the stand 80 is slid along the protrusions 56 of the adjacent support beams 54. As a result, the mounting portion 80B of the stand 80 is detachably (replaceably) attached to a predetermined portion (engagement portion 56P) of the protrusions 56 of the adjacent support beams 54.

[0073] In addition to the stands 80, the great bars 62 are also attached to the protruding portions 56 of the adjacent support beams 54. Therefore, the great bars 62 are arranged on both sides of the thickness direction (arrow Y direction) of the stand 80. In addition, the great bars 62 are provided with engaged portions similar to the stands 80.

[0074] (hardfacing welded section) A hardfacing weld 58 is provided on the engaging portion 56P of the protruding portion 56 of the support beam 54. The hardfacing weld 58 has higher wear resistance than the base material M of the engaging portion 56P. The hardfacing weld 58 is an example of a wear-resistant portion and a wear countermeasure portion.

[0075] The hardfacing weld 58 is formed by, for example, plasma powder buildup welding, by buildup welding a nickel-based alloy powder onto the base material M of the engaging portion 56P. The hardfacing weld 58 forms an upper surface 56U of the engaging portion 56P.

[0076] The room-temperature Vickers hardness Hv of the hardfacing welded portion 58 is, for example, 200 or more, which is greater than the room-temperature Vickers hardness Hv (for example, 180) of the base metal M of the engaging portion 56P. The room-temperature Vickers hardness Hv of this hardfacing welded portion 58 is preferably 20 or more greater, and more preferably 50 or more greater, than the room-temperature Vickers hardness Hv of the base metal M of the engaging portion 56P.

[0077] The room temperature Vickers hardness Hv of the base metal M of the hardfacing welded portion 58 and the engaging portion 56P is measured based on the test method of Part 1 of the Vickers hardness test of JIS Z 2244-1. The temperature range of the room temperature Vickers hardness Hv is 10 to 35°C.

[0078] The hardfacing welded portion 58 is provided so as to fill a recess 59 formed in the upper surface of the base metal M of the engaging portion 56P. Therefore, in this embodiment, the upper surface 56U of the engaging portion 56P is made substantially flush with the upper surface of the other portion of the protruding portion 56 (hereinafter referred to as the "general portion").

[0079] The upper surface 56U of the engaging portion 56P does not necessarily have to be substantially flush with the upper surface of the general portion of the protruding portion 56, but may protrude higher than the upper surface of the general portion of the protruding portion 56. In the present embodiment, as an example, the hardfacing weld portion 58 covers the tip end surface of the base material M of the engaging portion 56P.

[0080] The recess 59 is formed, for example, by abrasion of the upper surface of the base material M of the engaging portion 56P, or is formed in advance on the upper surface of the base material M of the engaging portion 56P when the support beam 54 is manufactured (cast).

[0081] (action) Next, the operation of the first embodiment will be described.

[0082] 7, the mounting portion 80B of the stand 80 is provided with a pair of engaged portions 82. The engaging portions 56P of the adjacent support beams 54 are inserted into the pair of engaged portions 82 so as to be engageable in the vertical direction. In this way, the mounting portion 80B of the stand 80 is attached to the adjacent support beams 54.

[0083] Here, with the upper engaged surface 82U of the engaged portion 82 engaged with the upper surface 56U of the engaging portion 56P, a gap G is formed between the lower surface 56L of the engaging portion 56P and the lower engaged surface 82L. This gap G absorbs the thermal expansion of the engaging portion 56P and the engaged portion 82 during sintering of the raw material R. Therefore, damage to the engaging portion 56P, etc. is suppressed.

[0084] On the other hand, if a gap G exists between the engaging portion 56P and the engaged portion 82, the engaging portion 56P and the engaged portion 82 may move relative to each other, which may cause the engaging portion 56P to wear. In particular, in this embodiment, when the sinter cake S formed on the sintering pallet 50 is discharged onto the crushing guide 42 (see FIG. 1), the upper end of the crushing guide 42 interferes with the end of the sinter cake S. Due to this interference, the engaged portion 82 collides with the engaging portion 56P, which makes the engaging portion 56P more susceptible to wear.

[0085] When the engaging portion 56P wears and the vertical gap G between the engaging portion 56P and the engaged portion 82 becomes equal to or greater than a predetermined value, the stand 80 may tilt relative to the support beam 54, or the tilt of the stand 80 relative to the support beam 54 may become greater, causing the stand 80 to become misaligned relative to the support beam 54. When the stand 80 becomes misaligned relative to the support beam 54, the stand 80 may not pass through the slit 44 (see FIG. 2) of the crushing guide 42 and may interfere with the crushing guide 42.

[0086] In contrast to this, in the present embodiment, a hardfacing weld 58 is provided on the engaging portion 56P of the support beam 54. The hardfacing weld 58 has higher wear resistance than the base material M of the engaging portion 56P. This suppresses wear of the engaging portion 56P, thereby suppressing misalignment, such as tilting, of the stand 80 relative to the support beam 54. Therefore, the stand 80 is prevented from interfering with the crushing guide 42 without passing through the slit 44 of the crushing guide 42.

[0087] Furthermore, as wear of the engaging portion 56P progresses, the engaging portion 56P may come out of the engaged portion 82, and the stand 80 may fall off from the support beam 54. In contrast, in this embodiment, the hardfacing welded portion 58 suppresses wear of the engaging portion 56P, thereby suppressing the stand 80 from falling off.

[0088] Furthermore, the room-temperature Vickers hardness Hv of the hardfacing welded portion 58 is greater than the room-temperature Vickers hardness Hv of the base material M of the engaging portion 56P by 20 or more. This makes it possible to more reliably suppress wear of the engaging portion 56P.

[0089] Furthermore, the hardfacing weld 58 is provided so as to fill a recess 59 formed on the upper surface of the base material M of the engaging portion 56P. This makes it possible to suppress wear of the engaging portion 56P without narrowing the gap G in the vertical direction between the engaging portion 56P and the engaged portion 82. This makes it easier to insert the engaging portion 56P provided with the hardfacing weld 58 into the engaged portion 82. This makes it easy to attach the mounting portion 80B of the stand 80 to the engaging portion 56P of the support beam 54.

[0090] (Modification of the first embodiment) In the above embodiment, the hardfacing weld 58 is provided on the upper surface of the base metal M of the engaging portion 56P. However, the hardfacing weld 58 may be provided on at least one of the upper surface and the lower surface of the base metal M of the engaging portion 56P.

[0091] In the first embodiment, the hardfacing weld 58 is provided in the recess 59 on the surface of the base metal M of the engaging portion 56P. However, the hardfacing weld 58 is not limited to the recess 59, and may be provided on the surface of the base metal M of the engaging portion 56P that is not worn, for example, so as to increase the thickness of the engaging portion 56P.

[0092] In the first embodiment, the wear-resistant portion is the hardfacing weld portion 58. However, the wear-resistant portion is not limited to the hardfacing weld portion 58. The wear-resistant portion may be, for example, a composite layer provided on the surface layer of the engaging portion 56P. This composite layer is formed, for example, by dispersing hard particles in the base material M of the surface layer of the engaging portion 56P.

[0093] Examples of materials that can be used for the hard particles include oxides, carbides, and nitrides. Specifically, alumina (Al2O3), magnesia (MgO), zirconia (Zr2O), silicon carbide, and silicon nitride are used. These materials are difficult to react with the raw material R and have appropriate hardness (room temperature Vickers hardness Hv of 800 to 4000, more preferably 900 to 4000).

[0094] By providing a composite layer on the surface of the engaging portion 56P in this manner, wear of the engaging portion 56P is suppressed. Therefore, similar to the first embodiment, displacement of the stand relative to the support beam 54 is suppressed.

[0095] Furthermore, by providing a composite layer on the surface of the engaging portion 56P, wear of the engaging portion 56P can be suppressed without narrowing the vertical gap G between the engaging portion 56P and the engaged portion 82. Therefore, for example, the mounting portion 80B of the stand 80 can be easily attached to the engaging portion 56P of the support beam 54.

[0096] Second Embodiment Next, a second embodiment will be described. In the second embodiment, the same components as those in the first embodiment will be denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

[0097] 8 and 9 show an engaging portion 56P in a protruding portion 56 of a support beam 54 according to the second embodiment. As shown in Fig. 9, in the second embodiment, an overlay weld 90 is provided on an upper surface 56U of the base material M of the engaging portion 56P. The overlay weld 90 protrudes upward in a protruding manner from the upper surface 56U of the base material M of the engaging portion 56P.

[0098] The overlay welded portion 90 is an example of a wear countermeasure portion.

[0099] The overlay weld portion 90 is formed, for example, by overlay welding on the upper surface 56U of the base metal M of the engaging portion 56P using arc welding for cast iron. The wear resistance of the overlay weld portion 90 is set to be the same as that of the base metal M of the engaging portion 56P. In other words, the room-temperature Vickers hardness Hv of the overlay weld portion 90 is set to be the same as the room-temperature Vickers hardness Hv (e.g., 180) of the base metal M of the engaging portion 56P.

[0100] An example of the chemical composition (mass %) of the weld metal of the overlay weld 90 is shown below. C: 0.9 Si: 0.4 Mn: 0.6 P: 0.01 or less S: 0.01 or less Ni:55.0 Remainder: Fe and impurities Impurities refer to components that are mixed in from raw materials such as ore and scrap during manufacturing, or that are mixed in due to various factors in the manufacturing process, and are not intentionally contained in the weld metal.

[0101] The thickness t of the overlay weld 90 is preferably set so that the gap G in the vertical direction between the engaging portion 56P and the engaged portion 82 is 4 mm or less, for example. Furthermore, as described above, the thickness t of the overlay weld 90 is preferably set so that the gap G is 2 mm or more in order to absorb the thermal expansion of the engaging portion 56P and the engaged portion 82 when the raw material R is sintered.

[0102] The thickness t of the overlay weld 90 can be changed as appropriate.

[0103] 10, the overlay weld portion 90 has a top surface 90A and a pair of inclined surfaces 90B. The top surface 90A is a flat surface. The pair of inclined surfaces 90B are formed at both ends of the overlay weld portion 90 in the longitudinal direction of the support beam 54.

[0104] Each inclined surface 90B is inclined with respect to an upper surface 56U of the base material M of the engagement portion 56P in a side view of the support beam 54, and connects the upper surface 56U and the top surface 90A of the buildup weld portion 90.

[0105] (action) Next, the operation of the second embodiment will be described.

[0106] As shown in FIG. 9 , an overlay weld 90 is provided on the engaging portion 56P of the support beam 54. The overlay weld 90 protrudes upward from the upper surface 56U of the base material M of the engaging portion 56P in a protruding manner. The overlay weld 90 makes the vertical gap G between the engaging portion 56P and the engaged portion 82 narrower than a predetermined value. In other words, the overlay weld 90 ensures a wear allowance. Therefore, misalignment, such as tipping of the stand 80 relative to the support beam 54, is suppressed.

[0107] In addition, inclined surfaces 90B are provided at both longitudinal ends of the support beam 54 in the overlay weld portion 90. Each inclined surface 90B is inclined with respect to the upper surface 56U of the base material M of the support beam 54 in a side view of the support beam 54.

[0108] As a result, for example, when the stand 80 is slid along the protrusion 56 of the support beam 54 and the engaging portion 56P having the overlay weld portion 90 is inserted into the engaged portion 82 of the stand 80, the engaged portion 82 slides along the inclined surface 90B.

[0109] This makes it easier to insert the engaging portion 56P provided with the buildup weld 90 into the engaged portion 82 of the stand 80. Therefore, the mounting portion 80B of the stand 80 can be easily attached to the engaging portion 56P of the support beam 54.

[0110] Furthermore, the thickness t of the overlay weld 90 is set so that the gap G in the vertical direction between the engaging portion 56P and the engaged portion 82 is 4 mm or less. As a result, in this embodiment, it is possible to effectively and long-term suppress misalignment of the stand 80 with respect to the support beam 54, compared to when the gap G in the vertical direction between the engaging portion 56P and the engaged portion 82 exceeds 4 mm.

[0111] (Modification of the second embodiment) In the second embodiment, an inclined surface 90B is provided at each of both longitudinal ends of the support beam 54 in the overlay weld portion 90. However, the inclined surface 90B can be provided at least on one of both longitudinal ends of the support beam 54 in the overlay weld portion 90. Furthermore, the inclined surface 90B may be provided as needed and can be omitted.

[0112] In the second embodiment, the buildup weld 90 is provided on the upper surface 56U of the base metal M of the engaging portion 56P. However, the buildup weld 90 may be provided on at least one of the upper surface 56U and the lower surface 56L of the base metal M of the engaging portion 56P.

[0113] Furthermore, in the second embodiment, the room-temperature Vickers hardness Hv of the overlay weld 90 is set to be the same as the room-temperature Vickers hardness Hv of the base metal M of the engaging portion 56P. However, for example, the overlay weld 90 may be a hardfacing weld as in the first embodiment, and its room-temperature Vickers hardness Hv may be set to be greater than the room-temperature Vickers hardness Hv of the base metal M of the engaging portion 56P.

[0114] In this case, similar to the first embodiment, it is preferable that the room-temperature Vickers hardness Hv of the overlay weld 90 is 20 or more times greater than the room-temperature Vickers hardness Hv of the base metal M of the engaging portion 56P. Also, similar to the second embodiment, it is preferable that the thickness of the hardface weld is set so that the gap in the vertical direction between the engaging portion 56P on which the hardface weld is provided and the engaged portion 82 is 4 mm or less.

[0115] Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and the embodiments and various modified examples may be used in appropriate combinations, and it goes without saying that the present invention can be implemented in various forms as long as they do not deviate from the gist of the present invention. [Explanation of symbols]

[0116] 50 sintering pallets 54 Support beam 56P engaging part 58 Hardfacing welded parts (wear prevention parts, wear-resistant parts) 59 Recess 60 Great 80 Stand 82 Engaged part 90 Overlay welded section (wear prevention section) 90B Slope G Gap (vertical gap between the engaging part and the engaged part) M Base material R Raw material for sinter

Claims

1. A sintering pallet having a grate on which raw materials for sintering are loaded, and sintering the raw materials while transporting them, a plurality of support beams arranged at intervals in the conveying direction and supporting the grate; a stand that is bridged between the adjacent support beams and protrudes above the grate, and that has engaging portions at both ends that hold the engaging portions, and that is capable of directly engaging with the engaging portions of the adjacent support beams in the vertical direction; Equipped with The engagement portion is provided with a wear prevention portion. Sintering palette.

2. The wear countermeasure portion is a wear resistant portion having higher wear resistance than a base material of the engagement portion. The sintering pallet according to claim 1.

3. The wear-resistant portion is a hardfacing welded portion. The sintering pallet according to claim 2.

4. The hardfacing weld portion is provided in a recess formed on the surface of the base material of the engagement portion, The sintering pallet according to claim 3.

5. The room temperature Vickers hardness Hv of the hardfacing weld portion is 20 or more times greater than the room temperature Vickers hardness Hv of the base material of the engagement portion. The sintering pallet according to claim 3 or 4.

6. The wear-resistant portion is provided on a surface layer of the engagement portion and is a composite layer in which hard particles are dispersed in a base material of the base material. The sintering pallet according to claim 2.

7. The wear countermeasure portion is a buildup weld portion that protrudes in the vertical direction from the surface of the base material of the engagement portion. The sintering pallet according to claim 1.

8. The longitudinal end of the support beam in the overlay weld portion has an inclined surface inclined with respect to the surface of the base material of the engagement portion in a side view of the support beam. The sintering pallet according to claim 7.

9. The thickness of the overlay weld is set so that the gap between the engaging portion and the engaged portion in the vertical direction is 4 mm or less. The sintering pallet according to claim 7 or 8.

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