Inspection method for sintering pallets

Abstract

To reduce the effort for inspecting an engagement part of a support beam, while suppressing positional deviation of a stand with respect to the support beam.SOLUTION: A method for inspecting a pallet for sintering a raw material R of sintered ore while conveying it, where a pallet 50 for sintering comprises: a grate 60 in which the raw material R is loaded; a plurality of support beams 54B, 54C, 54D that are arranged at intervals in a conveyance direction, and support the grate 60; and a plurality of front stands 80F and rear stands 80R in which engaging parts 56P of the adjacent support beams 54B, 54C, 54D are directly engaged in a vertical direction, and that have, at both end parts, a pair of engaged parts 82 holding the engaging part 56P, are bridged over the adjacent support beams 54B, 54C, 54D, and protrude above the grate 60. The method determines whether or not the engaging parts 56P of the plurality of support beams 54B, 54C, 54D need to be repaired, based on an amount of wear of the engaging part 56P of the support beam 54D, which is engaged with the rear side of the engaged part 82 in the conveyance direction among the pair of engaged parts 82 of the rear stand 80R.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a method for inspecting 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 (crush deck) 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] One possible solution to this problem is to periodically inspect the engaging portions of a plurality of support beams, but inspecting all of the engaging portions is time-consuming.

[0010] In consideration of the above, the present invention aims to reduce the effort required to inspect the engagement portion of the support beam while suppressing misalignment of the stand relative to the support beam. [Means for solving the problem]

[0011] The sintering pallet inspection method described in claim 1 is a sintering pallet inspection method for sintering raw materials for sintering while transporting them, wherein the sintering pallet comprises a grate on which the raw materials are loaded, a plurality of support beams arranged at intervals in the transport direction and supporting the grate, and a stand that is spanned between adjacent support beams and protrudes above the grate, with the engaging portions of adjacent support beams directly engaging with each other in the vertical direction and having a pair of engaged portions at both ends that hold the engaging portions, and the method determines whether or not repairs are necessary for the engaging portions of the plurality of support beams based on the amount of wear of the engaging portions of the support beam with which the engaged portion on the rear side in the transport direction of the pair of engaged portions of the stand engages.

[0012] According to the sintering pallet inspection method of claim 1, the sintering pallet sinters raw materials while transporting them. The sintering pallet includes a grate, a plurality of support beams, and a stand.

[0013] The grate is loaded with sintered ore raw materials. The grate is supported by multiple support beams spaced apart in the conveying direction of the sinter pallet. Stands that protrude above the grate are mounted between adjacent support beams. The stands are directly engaged with the engaging portions of adjacent support beams in the vertical direction, and have engaged portions at both ends that hold the engaging portions.

[0014] When the raw sintered ore loaded on the grate of the sintering pallet is sintered, a sinter cake is formed with stands embedded inside. This sinter cake is discharged onto the crushing guide at the ore discharge section where the sprocket is located. At this time, the upper end of the crushing guide interferes with the sinter cake on the grate. As a result of this interference, the engaged portion of the stand embedded in the sinter cake collides with the engaging portion of the support beam, making the engaging portion more susceptible to wear.

[0015] If the wear amount of the engaging portion of the support beam exceeds a predetermined value, for example, the stand may tilt relative to the support beam, or the tilt of the stand relative to the support beam may become large, causing the stand to become misaligned relative to the support beam. If 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.

[0016] Here, if the upper end of the crushing guide interferes with the sinter cake on the grate, of the pair of engaged parts of the stand, the engaged part on the rear side in the conveying direction is more likely to collide with the engaging part of the support beam than the engaged part on the front side in the conveying direction.

[0017] Therefore, in the present invention, the necessity of repairs to the engaging portions of the plurality of support beams is determined based on the amount of wear of the engaging portion of the support beam with which the rear engaged portion in the conveying direction of one of the pair of engaged portions of the stand engages. As a result, in the present invention, it is possible to omit inspection of the engaging portion of the support beam with which the front engaged portion in the conveying direction of one of the pair of engaged portions of the stand engages, while suppressing misalignment of the stand with respect to the support beam.

[0018] In this way, the present invention can reduce the effort required to inspect the engagement portion of the support beam while suppressing misalignment of the stand relative to the support beam.

[0019] The inspection method for sintering pallets described in claim 2 is the inspection method for sintering pallets described in claim 1, wherein the engaging portions protrude from adjacent support beams toward each other, the engaged portions are formed in a concave shape into which the engaging portions can be inserted so as to be engageable in the vertical direction, and the amount of wear of the engaging portions includes the amount of wear at the tip ends of the engaging portions in the protruding direction.

[0020] According to the sintering pallet inspection method of claim 2, the engaging portions protrude from the adjacent support beams toward each other. Also, the engaged portions at both ends of the stand are formed in a recessed shape into which the engaging portions of the adjacent support beams are inserted so as to be engageable in the vertical direction.

[0021] Here, if the amount of wear at the tip of the engaging portion of the support beam in the protruding direction reaches a predetermined value or more, the vertical engagement between the engaging portion and the engaged portion will be released, and the stand may fall off from the adjacent support beam.

[0022] In contrast, in the present invention, the wear amount of the engaging portion of the support beam with which the rear engaging portion in the conveying direction of one of the pair of engaged portions of the stand engages includes the wear amount of the tip end of the engaging portion in the protruding direction. By determining whether or not repairs are required for the engaging portions of the multiple support beams based on this wear amount, it is possible to prevent the stand from falling off the support beam.

[0023] The sintering pallet inspection method described in claim 3 is the sintering pallet inspection method described in claim 2, in which the distance between the tip ends of the engaging portions of adjacent support beams is used as the amount of wear at the tip ends of the engaging portions.

[0024] According to the sintering pallet inspection method of claim 3, the distance between the engaging portions of adjacent support beams is used as the amount of wear at the tip of the engaging portion of the support beam with which the rear engaged portion in the conveying direction of one of a pair of engaged portions of the stand engages. In other words, in the present invention, the need for repair of the engaging portions of multiple support beams is determined based on the distance between the tip of the engaging portions of adjacent support beams.

[0025] Here, if the interval between the engaging portions of the adjacent support beams becomes wider, the stand becomes more likely to fall off from the adjacent support beams.

[0026] Therefore, in the present invention, as described above, whether or not repair is required for the engaging portions of multiple support beams is determined based on the distance between the tips of the engaging portions of adjacent support beams, thereby more reliably preventing the stand from falling off the support beams.

[0027] The sintering pallet inspection method according to claim 4 is the sintering pallet inspection method according to claim 3, in which whether or not repair is required for the engaging portions of the plurality of support beams is determined based on the following formula (1). LW>H×α (1) however, L: Width between the lower edges of a pair of engaged parts of the stand W: Distance between the tips of the engaging parts of adjacent support beams H: The maximum gap (=WT) between the bottom inner wall surface of one of the engaged parts of the stand and the tip of the engaging part of the support beam with which the engaged part is engaged. T: Width of the constricted part of the stand formed by the pair of engaged parts α: coefficient (0<α≦1) is.

[0028] According to the sintering pallet inspection method of claim 4, it is determined whether or not repair is required for the engaging portions of the plurality of support beams based on the formula (1).

[0029] By using formula (1) in this way, it is possible to uniformly determine whether or not repair is required for the engagement portions of multiple support beams.

[0030] The coefficient α is used to ensure that the stand does not fall off the support beam until the next inspection of the sintering pallet, and is set appropriately within the range of 0<α≦1 based on, for example, the inspection cycle of the sintering pallet and the wear rate of the engagement part of the support beam.

[0031] The method for inspecting sintering pallets described in claim 5 is a method for inspecting sintering pallets described in any one of claims 1 to 4, in which a plurality of stands are provided in the conveying direction, and the need for repair of the engaging portions of the plurality of support beams is determined based on the amount of wear of the engaging portions of the support beam with which the engaged portion of the stand furthest rear in the conveying direction among the plurality of stands engages.

[0032] According to the sintering pallet inspection method of claim 5, a plurality of stands are provided in the conveying direction. Whether or not repair is required for the engaging portions of the plurality of support beams is determined based on the amount of wear of the engaging portions of the support beams with which the engaged portions of the stand furthest rear in the conveying direction engage.

[0033] As mentioned above, the sinter cake formed on the grate of the sintering pallet is discharged onto the crushing guide in the ore discharge section. In this ore discharge section, the sintering pallet first follows the outer periphery of the sprocket of the ore discharge section. As the sintering pallet descends, it tilts forward, and the front side of the sinter cake in the conveying direction gradually peels off from the grate.

[0034] Therefore, among the multiple stands, the stand at the front in the conveying direction is likely to peel off from the sinter cake, and the sinter cake is likely to be held by the stand at the rear in the conveying direction. In this state, if the upper end of the crushing guide interferes with the sinter cake, a larger collision load (impact load) is input to the stand at the rear in the conveying direction than to the stand at the front in the conveying direction. As a result, the amount of wear on the engaging portion of the support beam with which the engaged portion of the stand at the rear in the conveying direction engages is likely to increase.

[0035] Therefore, in the present invention, as described above, whether or not repairs are required for the engaging portions of the plurality of support beams is determined based on the amount of wear on the engaging portion of the support beam with which the engaged portion of the stand furthest rear in the conveying direction engages among the plurality of stands. As a result, in the present invention, it is possible to omit inspection of the engaging portion of the support beam with which the engaged portion of the stand furthest forward in the conveying direction engages while suppressing misalignment of the stand relative to the support beam.

[0036] In this way, the present invention can further reduce the effort required to inspect the amount of wear at the engagement portion of the support beam while suppressing misalignment of the stand relative to the support beam. [Effects of the Invention]

[0037] As described above, according to the present invention, it is possible to reduce the effort required to inspect the engagement portion of the support beam while suppressing misalignment of the stand with respect to the support beam. [Brief explanation of the drawings]

[0038] [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. 5. [Figure 7] FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 6. [Figure 8] FIG. 5 is a plan view corresponding to FIG. 4, showing a modified example of the sintering pallet according to the first embodiment. [Figure 9] 9 is a cross-sectional view taken along line 9-9 in FIG. 8. DETAILED DESCRIPTION OF THE INVENTION

[0039] Hereinafter, a sintering pallet inspection method according to one embodiment will be described with reference to the drawings.

[0040] (sintering machine) 1 shows a Dwight Lloyd type sintering machine 10 equipped with a sintering pallet 50 to which the sintering pallet inspection method according to this embodiment is applied. 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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. In addition, the sintering pallet 50 tilts forward, and the front side of the sinter cake S in the conveying direction gradually peels off from the sintering pallet 50.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] (Sintering pallet) Next, the structure of the sintering pallet will be described in detail.

[0052] 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.

[0053] 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.

[0054] 4, the base 52 is formed in a rectangular shape in a plan view. The base 52 has a plurality of support beams (frames) 54A, 54B, 54C, and 54D. The plurality of support beams 54A to 54D are formed from cast steel or the like.

[0055] The multiple support beams 54A to 54D are arranged along the width direction (arrow Y direction) of the sintering pallet 50, and are arranged at intervals in the conveying direction (arrow X direction) of the sintering pallet 50. Adjacent support beams 54A to 54D are connected by ribs (not shown). The grate 60 is supported by these support beams 54A to 54D.

[0056] 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 respectively bridged across the upper ends of the adjacent support beams 54A to 54D, and are arranged in the longitudinal direction (direction of arrow Y) of the support beams 54A to 54D.

[0057] The upper surface of the grate 60 is 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 beams 54A to 54D. Air within the raw material R is sucked into the suction device 32 (see FIG. 1) through these gaps.

[0058] The pair of side walls 70 are formed into a plate shape 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 in the width direction of the base 52, and are connected to the ends of the multiple support beams 54A to 54D.

[0059] 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.

[0060] 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).

[0061] 4, the plurality of stands 80 are formed into a plate shape from heat-resistant cast steel or the like. The plurality of stands 80 are arranged at intervals in the width direction of the sintering pallet 50 and are also arranged along the conveying direction of the sintering pallet 50.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] Here, the multiple stands 80 are provided at the center and rear in the conveying direction of the sintering pallet 50. More specifically, each stand 80 is attached to three support beams 54B to 54D on the rear side in the conveying direction of the sintering pallet 50 out of the four support beams 54A to 54D.

[0066] In the following, the stand 80 provided at the center of the sintering pallet 50 in the transport direction will be referred to as the front stand 80F, and the stand 80 provided at the rear of the sintering pallet 50 in the transport direction will be referred to as the rear stand 80R.

[0067] The plurality of front stands 80F are bridged over the upper ends of the adjacent support beams 54B, 54C. The plurality of rear stands 80R are respectively disposed on the rear side of the plurality of front stands 80F in the conveying direction of the sintering pallet 50. These rear stands 80R are bridged over the upper ends of the adjacent support beams 54C, 54D.

[0068] The mounting structures of the front stand 80F and the rear stand 80R to the support beams 54B to 54D are the same. Therefore, the following description will be given of the mounting structure of the rear stand 80R to the support beams 54C and 54D, and the description of the mounting structure of the front stand 80F to the support beams 54B and 54C will be omitted as appropriate.

[0069] 5, the mounting portions 80B of the rear stands 80R are bridged across the upper ends of adjacent support beams 54C, 54D. The upper end of the support beam 54C has a T-shaped cross section, while the upper end of the support beam 54D has an L-shaped cross section.

[0070] The upper ends of the support beams 54B and 54C are provided with protrusions 56 that protrude toward each other. That is, the upper end of the support beam 54C is provided with a protrusion 56 that protrudes toward the rear side in the conveying direction of the sintering pallet 50. On the other hand, the upper end of the support beam 54D is provided with a protrusion 56 that protrudes toward the front side in the conveying direction of the sintering pallet 50.

[0071] As shown in Fig. 6, the protrusions 56 are provided along the longitudinal direction (direction of arrow Y) of the support beams 54C, 54D. Note that the grate bar 62 (grate 60) is not shown in Fig. 6.

[0072] 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 and rear ends of the mounting portion 80B in the conveying direction (direction of arrow X) of the sintering pallet 50.

[0073] The pair of engaged portions 82 are formed in a concave shape with openings on opposite sides when viewed from the thickness direction of the rear stand 80R. That is, the engaged portion 82 formed at the front end of the mounting portion 80B is a concave portion with openings 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 concave portion with openings on the rear side in the conveying direction of the sintering pallet 50. These engaged portions 82 form a constricted portion 80K in the mounting portion 80B of the rear stand 80R.

[0074] The engaging portions 56P of the adjacent support beams 54C, 54D 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 beams 54C, 54D, 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.

[0075] 7, an upper inner wall surface 82U of the engaged portion 82 is directly engaged in the up-down direction with an upper surface 56U of the engaging portion 56P. A lower inner wall surface 82L of the engaging portion 56P is directly engaged in the up-down direction with a lower surface 56L of the engaging portion 56P. A bottom inner wall surface 82T of the engaged portion 82 is directly engaged with a tip end 56T in the protruding direction (arrow X direction) of the engaging portion 56P. The bottom inner wall surface 82T connects the upper inner wall surface 82U and the lower inner wall surface 82L.

[0076] When viewed from the thickness direction of the rear stand 80R, the lower inner wall surface 82L is shorter than the upper inner wall surface 82U. In other words, when viewed from the thickness direction of the rear stand 80R, the lower edge 82L1 of the engaged portion 82 is located closer to the center of the rear stand 80R than the upper edge 82U1 of the engaged portion 82. The engaging portion 56P is held between the upper inner wall surface 82U and the lower inner wall surface 82L.

[0077] With the upper inner wall 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 inner wall surface 82L. In other words, the mounting portion 80B of the rear stand 80R is attached to the adjacent support beams 54C, 54D so as to be relatively displaceable in the up and down direction.

[0078] In this embodiment, the engaging portions 56P of the support beams 54C, 54D are capable of directly engaging in the vertical direction with the engaged portions 82 of the stand 80. "Direct engagement" here means, for example, that no insulation pieces are interposed between the engaging portions 56P and the engaged portions 82. The insulation pieces are made of steel that suppress heat transfer from the stand 80 to the support beams 54A to 54D.

[0079] When attaching the rear stand 80R to the adjacent support beams 54C, 54D, the protrusions 56 at one longitudinal end of the adjacent support beams 54C, 54D are inserted into the pair of engaged portions 82 of the rear stand 80R. In this state, the rear stand 80R is slid along the protrusions 56 of the adjacent support beams 54C, 54D. As a result, the mounting portions 80B of the rear stand 80R are detachably (replaceably) attached to predetermined portions (engagement portions 56P) of the protrusions 56 of the adjacent support beams 54C, 54D.

[0080] In addition to the rear stand 80R, the great bar 62 is also attached to the protrusions 56 of the adjacent support beams 54C, 54D. Therefore, the great bar 62 is disposed on both sides of the rear stand 80R in the thickness direction (arrow Y direction). The great bar 62 is provided with an engaged portion, similar to the rear stand 80R.

[0081] (Inspection method for sintering pallets) Next, an example of an inspection method (checking method) for the sintering pallet according to this embodiment will be described.

[0082] The engaging portions 56P of the support beams 54B to 54D are engaged with the engaged portions 82 of the front stand 80F and the rear stand 80R. Therefore, there is a possibility that the engaging portions 56P of the support beams 54B to 54D will wear out.

[0083] In particular, in this embodiment, as described above, when the sinter cake S formed on the sintering pallet 50 is discharged onto the crushing guide 42 (see FIG. 1) in the ore discharge section 40, the upper end of the crushing guide 42 interferes with 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.

[0084] When the wear amount of the engagement portion 56P exceeds a predetermined value, the front stand 80F and the rear stand 80R may tilt relative to the support beams 54B to 54D, or the tilt of the front stand 80F and the rear stand 80R relative to the support beams 54B to 54D may become greater, which may cause the front stand 80F and the rear stand 80R to become misaligned relative to the support beams 54B to 54D.

[0085] If the front stand 80F and the rear stand 80R are misaligned with respect to the support beams 54B to 54D, the front stand 80F and the rear stand 80R may not pass through the slits 44 of the crushing guide 42 and may interfere with the crushing guide 42. Furthermore, if the amount of wear on the tip end 56T of the engagement portion 56P becomes large, the front stand 80F and the rear stand 80R may fall off the support beams 54B to 54D.

[0086] One possible solution to this problem is to periodically inspect the engagement portions 56P of the three support beams 54B to 54D to which the front stand 80F and the rear stand 80R are attached. However, inspecting all of the engagement portions 56P of the three support beams 54B to 54D is time-consuming.

[0087] As described above, in the ore discharge section 40, the sintering pallet 50 first descends along the outer periphery of the sprocket 14 of the ore discharge section 40. As the sintering pallet 50 descends, it tilts forward, and the front side of the sinter cake S in the conveying direction gradually peels off from the grate 60.

[0088] Therefore, the front stand 80F is likely to separate from the sinter cake S, and the sinter cake is likely to be held by the rear stand 80R. In this state, if the upper end of the crushing guide 42 interferes with the sinter cake S, a larger collision load (impact load) is input to the rear stand 80R than to the front stand 80F. As a result, the amount of wear of the engaging portions 56P of the support beams 54C, 54D, with which the engaged portions 82 of the rear stand 80R engage, is likely to increase.

[0089] Furthermore, in the ore discharge section 40, when the upper end of the crushing guide 42 interferes with the sinter cake S on the grate 60, of the pair of engaged portions 82 in the front stand 80F and the rear stand 80R, the engaged portion 82 on the rear side in the conveying direction is more likely to collide with the engaging portion 56P of the support beam 54D than the engaged portion 82 on the front side in the conveying direction.

[0090] Therefore, in this embodiment, the inspection target is the engaging portion 56P of the support beam 54D, which is engaged with the rear engaged portion 82 in the conveying direction of the rear stand 80R, out of the pair of engaged portions 82 of the front stand 80F and the rear stand 80R. Then, based on the amount of wear of the engaging portion 56P of the support beam 54D, it is determined whether repairs are required for the engaging portions 56P of the three support beams 54B to 54D.

[0091] Furthermore, when the upper end of the crushing guide 42 interferes with the sinter cake S on the grate 60, the amount of wear of the engaging portion 56P of the support beam 54C with which the engaged portion 82 on the front side in the conveying direction of the rear stand 80R engages is smaller than the amount of wear of the engaging portion 56P of the support beam 54D with which the engaged portion 82 on the rear side in the conveying direction of the rear stand 80R engages. Therefore, in this embodiment, the distance W between the tip ends 56T of the engaging portions 56P of the adjacent support beams 54C, 54D is used as the amount of wear of the engaging portion 56P of the support beam 54D.

[0092] Specifically, first, the grate bar 62 and rear stand 80R are removed from the support beams 54C, 54D. Next, as shown in Fig. 7, the distance W between the tip ends 56T of the opposing engagement portions 56P of the adjacent support beams 54C, 54D is measured.

[0093] In this embodiment, four rear stands 80R (see FIG. 4) are attached to adjacent support beams 54C, 54D. Therefore, the distance W between the tip ends 56T of the opposing engagement portions 56P of the adjacent support beams 54C, 54D is measured at four locations.

[0094] If at least one of the four measured intervals W satisfies the following formula (1), it is determined that repair of the engagement portions 56P of the three support beams 54B to 54D is necessary. On the other hand, if none of the four measured intervals W satisfy the following formula (1), it is determined that repair of the engagement portions 56P of the three support beams 54B to 54D is unnecessary.

[0095] LW>H×α (1) however, L: Width between the lower edges 82L1 of the pair of engagement portions 82 in the rear stand 80R W: Distance between the tip ends 56T of the engagement portions 56P of the adjacent support beams 54C, 54D H: The maximum gap (=WT) between the bottom inner wall surface 82T of one of the engaged portions 82 of the rear stand 80R and the tip end 56T of the engaging portion 56P of the support beam 54C (or support beam 54D) with which the engaged portion 82 is engaged. T: Width of the constricted portion 80K of the rear stand 80R formed by the pair of engaged portions 82 α: coefficient (0<α≦1) is.

[0096] Here, the coefficient α, for example, ensures that the rear stand 80R does not fall off the support beams 54C, 54D until the next inspection of the sintering pallet 50, and is appropriately set within the range of 0<α≦1 based on the inspection cycle of the sintering pallet 50 and the wear rate of the engagement portions 56P of the support beams 54C, 54D. This coefficient α is preferably, for example, 0.5≦α<1.0, and more preferably 0.6≦α≦0.9.

[0097] As a method for repairing the engaging portion 56P, for example, the worn portion of the engaging portion 56P is overlay welded. At this time, the room temperature Vickers hardness of the weld metal of the overlay weld may be made higher than the room temperature Vickers hardness of the base material of the engaging portion 56P.

[0098] (action) Next, the operation of this embodiment will be described.

[0099] In this embodiment, as described above, the need for repairs to the engaging portions 56P of the three support beams 54B to 54D is determined based on the amount of wear of the engaging portion 56P of the support beam 54D with which the rear engaged portion 82 in the conveying direction of one of the pair of engaged portions 82 of the rear stand 80R engages.

[0100] As a result, in this embodiment, it is possible to suppress positional deviation of the front stand 80F and the rear stand 80R relative to the three support beams 54B to 54D, while omitting inspection of the engaging portions 56P of the two support beams 54B, 54C with which the pair of engaged portions 82 of the front stand 80F engage.

[0101] Furthermore, in this embodiment, while suppressing positional deviation of the front stand 80F and the rear stand 80R relative to the three support beams 54B to 54D, it is possible to omit inspection of the engaging portion 56P of the support beam 54C, with which the front engaged portion 82 in the conveying direction of one of the pair of engaged portions 82 of the rear stand 80R engages.

[0102] In this manner, in this embodiment, it is possible to reduce the effort required to inspect the wear amount of the engagement portions 56P of the support beams 54B to 54D while suppressing positional deviation of the front stand 80F and the rear stand 80R relative to the three support beams 54B to 54D.

[0103] Furthermore, when the wear amount of the tip 56T of the engaging portion 56P of the support beams 54B to 54D exceeds a predetermined value, the vertical engagement between the engaging portion 56P and the engaged portion 82 is released, and the front stand 80F and the rear stand 80R may fall off from the support beams 54B to 54D.

[0104] In contrast to this, in this embodiment, whether or not repair is required for the three support beams 54B to 54D is determined based on the amount of wear at the tip end 56T of the engagement portion 56P of the support beam 54D. This makes it possible to prevent the front stand 80F and the rear stand 80R from falling off the support beams 54B to 54D.

[0105] Here, in the support beams 54C, 54D to which the rear stand 80R is attached, if the distance W between the tip ends 56T of the engagement portions 56P becomes large, the rear stand 80R becomes more likely to fall off the support beams 54C, 54D.

[0106] Therefore, in this embodiment, the distance W between the tips 56T of the engaging portions 56P of the adjacent support beams 54C, 54D is used as the amount of wear of the tips 56T of the engaging portions 56P of the support beam 54D. In other words, whether or not repair is required for the engaging portions 56P of the three support beams 54B to 54D is determined based on the distance W between the tips 56T of the engaging portions 56P of the adjacent support beams 54C, 54D.

[0107] As a result, in this embodiment, it is possible to more reliably prevent the front stand 80F and the rear stand 80R from falling off the three support beams 54B to 54D.

[0108] Furthermore, in this embodiment, whether or not repair is required for the engaging portions 56P of the three support beams 54B to 54D is determined based on the above formula (1).

[0109] By using the formula (1) in this way, in this embodiment, it is possible to uniformly determine whether or not repair is required for the engagement portions 56P of the three support beams 54B to 54D.

[0110] (Variation) Next, a modification of the above embodiment will be described.

[0111] In the above embodiment, the distance W between the tip ends 56T of the engaging portions 56P of the adjacent support beams 54C, 54D was used as the amount of wear of the engaging portions 56P of the support beams 54D with which the rear engaged portions 82 of the rear stand 80R in the conveying direction engage. However, the above embodiment may measure the amount of wear of the tip ends 56T of the engaging portions 56P of the support beams 54D without using the distance W, and determine whether or not repairs are required for the engaging portions 56P of the three support beams 54B to 54D based on the amount of wear.

[0112] The amount of wear of the tip 56T of the engagement portion 56P of the support beam 54D is measured as the amount of wear of the tip 56T of the engagement portion 56P relative to the tip of the protrusion 56 of the support beam 54D, for example.

[0113] In the above embodiment, the amount of wear was measured on the tip 56T of the engagement portion 56P of the support beam 54D. However, for example, if the amount of wear on the upper surface 56U or the lower surface 56L of the engagement portion 56P of the support beam 54D exceeds a predetermined value, the rear stand 80R may tilt relative to the support beam 54D, or the tilt of the rear stand 80R relative to the support beam 54D may become greater, which may cause the rear stand 80R to become misaligned relative to the support beam 54D.

[0114] Therefore, the amount of wear on at least one of the upper surface 56U and the lower surface 56L of the engagement portion 56P of the support beam 54D may be measured, and based on the measured amount of wear, it may be determined whether or not the engagement portions 56P of the three support beams 54B to 54D need to be repaired.

[0115] In addition, the sintering pallet 50 in the above embodiment has a plurality of front stands 80F and rear stands 80R attached in the conveying direction. However, the sintering pallet 50 may have at least one stand 80 attached in the conveying direction.

[0116] For example, in the modified example shown in Fig. 8, the support beam 54B is omitted from the sintering pallet 50. In other words, the sintering pallet 50 has three support beams 54A, 54C, and 54D. A stand 80 is attached to the rear of the sintering pallet 50 in the conveying direction.

[0117] Specifically, of the three support beams 54A, 54C, 54D, the stand 80 is attached to the two support beams 54C, 54D on the rear side in the conveying direction of the sintering pallet 50.

[0118] 9, for example, whether or not repair is required for the engaging portions 56P of the two support beams 54C, 54D is determined based on the amount of wear of the engaging portion 56P of the support beam 54D with which the rear engaged portion 82 in the conveying direction of one of a pair of engaged portions 82 of the stand 80 engages. In this case, as in the above embodiment, the distance between the tip ends 56T of the engaging portions 56P of the adjacent support beams 54C, 54D may be used as the amount of wear of the engaging portion 56P of the support beam 54D.

[0119] Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and one embodiment and various modified examples may be used in appropriate combination, and it goes without saying that the present invention can be implemented in various forms as long as it does not deviate from the gist of the present invention. [Explanation of symbols]

[0120] 50 sintering pallets 54B Support beam 54C Support beam 54D support beam 56P engaging part 56T tip 60 Great 80 Stand 80F Front stand (stand) 80R rear stand (stand) 80K Neck 82 Engaged part 82L1 Lower edge R raw material

Claims

1. A method for inspecting a sintering pallet that sinters raw materials while transporting them, comprising: The sintering pallet is a grate on which the raw material is loaded; 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 a pair of engaged portions at both ends that hold the engaging portions and that are directly engaged with the engaging portions of the adjacent support beams in the vertical direction; Equipped with determining whether repair is required for the engaging portions of the plurality of support beams based on the amount of wear of the engaging portion of the support beam with which the rear engaged portion in the conveying direction of one of the pair of engaged portions of the stand is engaged; Inspection method for sintering pallets.

2. The engaging portions protrude from the adjacent support beams toward each other, The engaged portion is formed in a recessed shape into which the engaging portion is inserted so as to be engageable in the vertical direction, The wear amount of the engagement portion includes the wear amount of the tip end portion of the engagement portion in the protruding direction.

2. The method for inspecting a sintering pallet according to claim 1.

3. The distance between the tip ends of the engaging portions of the adjacent support beams is used as the wear amount of the tip ends of the engaging portions.

3. The method for inspecting a sintering pallet according to claim 2.

4. Determine whether or not repair is required for the engagement portions of the plurality of support beams based on the following formula (1):

4. The method for inspecting a sintering pallet according to claim 3. L-W>H×α...(1) however, L: Width between the lower edges of a pair of engaged parts of the stand W: Distance between the tips of the engaging portions of adjacent support beams H: Maximum gap (= W-T) between the bottom inner wall surface of one of the engaged parts of the stand and the tip of the engaging part of the support beam with which the engaged part is engaged T: Width of the constricted portion of the stand formed by the pair of engaged portions α: coefficient (0<α≦1) is.

5. The stand is provided in a plurality in the conveying direction, determining whether or not repair is required for the engaging portions of the plurality of support beams based on the amount of wear of the engaging portions of the support beams with which the engaged portions of the stand furthest rear in the conveying direction among the plurality of stands are engaged; A method for inspecting a sintering pallet according to any one of claims 1 to 4.

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