Chain lifting jig and chain lifting method

Abstract

To provide a chain lifting jig and a chain lifting method capable of reducing the labor required for lifting a large chain.SOLUTION: A chain lifting jig 20 has side walls 21, 21 for receiving longitudinal ends 122 of a pair of outer link plates 12, 12 arranged parallel to each other, a bottom wall 22 fixed to the side walls 21, 21 and for receiving a conveyor chain 7 from below, and a hanging part 23 on which a lifting tool 50 for lifting the chain lifting jig 20 is hung.SELECTED DRAWING: Figure 4

Description

Technical Field

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[0001] The present invention relates to a chain lifting jig and a chain lifting method.

Background Art

[0002] A chain holding jig for holding a chain is known (see, for example, Patent Document 1). The chain holding jig described in Patent Document 1 has a jig body in which a plurality of convex portions are arranged in a straight line on an elongated substrate. Each convex portion is fitted between a plurality of rollers of the roller chain from one side in the thickness direction of the roller chain. Then, the convex portion is fixed by a pressing plate and a bolt arranged on the other side in the thickness direction of the roller chain. Thereby, the chain holding jig is fixed to the roller chain.

Prior Art Documents

Patent Documents

[0003] 3]]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a steelmaking plant, slabs may be cast by a continuous casting machine. The cast slabs are cooled by a slab cooler that cools the slabs. The slab cooler has a conveyor chain for conveying the slabs. The conveyor chain is an endless roller chain and has an upper region where slabs from the continuous casting machine are placed and a lower region that returns to the continuous casting machine. Since this conveyor chain is large and heavy, a bobbin-shaped return guide roller is hung on the lower region of the conveyor chain. <000]027> The return guide roller rests on the lower region of the conveyor chain and supports this region from below. Therefore, the lower region of the conveyor chain is lifted by the return guide roller in its vicinity. The return guide roller needs to be replaced periodically. When replacing the return guide roller, the lower region of the conveyor chain needs to be lifted away from the roller. Traditionally, this lifting operation involved wrapping a wire around the conveyor chain near the return guide roller and hoisting this wire with a chain hoist.

[0006] However, because the conveyor chain is supported by being lifted by the return guide roller, the conveyor chain around the return guide roller is oriented at an angle to the horizontal. Furthermore, a concrete foundation supporting the upper region of the conveyor chain is located directly above the return guide roller.

[0007] Therefore, the space available for lifting the conveyor chain is low, and furthermore, the chain stretches due to the wire being compressed when lifted, requiring repeated adjustments (setup changes) after lifting it a little.

[0008] Furthermore, since the wire needs to be attached to the slanted section of the lower part of the conveyor chain, it is difficult to attach the wire, and there is a risk that the wire may get caught in the joints of the conveyor chain when lowering it.

[0009] Thus, lifting the lower region of the conveyor chain for tasks such as replacing the return guide roller is time-consuming. The chain holding jig described in Patent Document 1 is not configured to hold such a large conveyor chain.

[0010] In view of the above circumstances, the present invention aims to provide a chain lifting jig and a chain lifting method that can reduce the effort required for lifting large chains. [Means for solving the problem]

[0011] The present invention is essentially based on the following chain lifting jig and chain lifting method.

[0012] (1) A chain lifting jig for lifting a chain having a pair of link plates arranged parallel to each other, The link plate includes a side wall for receiving the longitudinal end of the chain, A bottom wall fixed to the side wall and receiving the chain from below, A hanging section on which a lifting device for lifting the chain lifting jig is attached, A chain lifting jig equipped with [a specific feature].

[0013] (2) The chain lifting jig according to (1), wherein the side wall and the bottom wall are detachably fixed to each other.

[0014] (3) The chain lifting jig according to (1) or (2), wherein the side wall comprises a side plate having one side facing the side of the link plate, and a side projection that protrudes from the one side and is arranged to contact the end of the link plate.

[0015] (4) The chain lifting jig according to any one of (1) to (3) above, wherein the bottom wall comprises a bottom plate positioned below the pair of link plates, and a pair of bottom projections positioned spaced apart in the thickness direction of the side wall so as to protrude above the bottom plate and to contact the chain.

[0016] (5) A chain lifting method using a chain lifting jig described in any one of the above items (1) to (4), A chain lifting method, comprising arranging the side wall of the jig adjacent to the end of the chain, arranging the bottom wall below the chain, and then lifting the chain lifting jig using a lifting tool hung on the hanging portion, so as to lift the chain with the bottom wall while hooking the end of the link plate on the side wall.

Advantages of the Invention

[0017] According to the present invention, the labor required for lifting a large chain can be reduced.

Brief Description of the Drawings

[0018] [Figure 1] FIG. 1 is a schematic side view showing a main part of a slab cooler. [Figure 2] FIG. 2 is a schematic longitudinal sectional view of a conveying chain of a slab cooler, showing a state as viewed in the reciprocating movement direction X of the conveying chain. [Figure 3] FIG. 3 is a perspective view for explaining an operation of lifting a lower region of a conveying chain using a chain lifting jig according to an embodiment of the present invention, showing a state before the conveying chain is lifted. [Figure 4] FIG. 4 is a perspective view for explaining an operation of lifting a lower region of a conveying chain using a chain lifting jig according to an embodiment of the present invention, showing a state where the conveying chain is lifted. [Figure 5] FIG. 5 is a side view showing a state where a chain lifting jig is hung on a conveying chain. [Figure 6] FIG. 6 is a sectional view taken along line IV-IV of FIG. 5. [Figure 7] FIG. 7(A) is a front view of a side wall of a chain lifting jig, and FIG. 7(B) is a side view of the side wall. [Figure 8] FIG. 8(A) is a front view of a bottom wall of a chain lifting jig, and FIG. 8(B) is a side view of the bottom wall.

Embodiments for Carrying Out the Invention

[0019] Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

[0020] FIG. 1 is a schematic side view showing a main part of the slab cooler 1. FIG. 2 is a schematic longitudinal sectional view of the conveying chain 7 of the slab cooler 1, showing the state when the conveying chain 7 is viewed in the reciprocating movement direction X of the conveying chain 7. FIG. 3 is a perspective view for explaining an operation of lifting the lower region 10 of the conveying chain 7 using a chain lifting jig 20 according to an embodiment of the present invention, showing a state before the conveying chain 7 is lifted. FIG. 4 is a perspective view for explaining an operation of lifting the lower region 10 of the conveying chain 7 using a chain lifting jig 20 according to an embodiment of the present invention, showing a state where the conveying chain 7 is lifted. FIG. 5 is a side view showing a state where the chain lifting jig 20 is hung on the conveying chain 7. FIG. 6 is a sectional view taken along line IV-IV of FIG. 5. FIG. 7(A) is a front view of the side wall 21 of the chain lifting jig 20, and FIG. 7(B) is a side view of the side wall 21. FIG. 8(A) is a front view of the bottom wall 22 of the chain lifting jig 20, and FIG. 8(B) is a side view of the bottom wall 22.

[0021] Referring to FIGS. 1 to 8(B), the slab cooler 1 is configured to convey the slab S cast by the continuous casting machine 2 in one direction (right direction in FIG. 1) of the reciprocating movement direction X. The slab cooler 1 includes a lower base 3 having a horizontal upper surface, a roller support base 4 fixed to the lower base 3 and rising upward from the lower base 3, a guide roller 5 supported by the roller support base 4, an upper base 6 installed above the lower base 3, and a conveying chain 7 hung on the upper base 6 and the guide roller 5.

[0022] The upper base 6 is a horizontal beam-like portion supported by columns 8 rising from the lower base 3. The longitudinal direction of the upper base 6 is parallel to the reciprocating movement direction X. The direction away from the continuous casting machine 2 in the reciprocating movement direction X is the forward path direction X1, and the direction toward the continuous casting machine 2 is the return path direction X2.

[0023] The guide roller 5 is formed, for example, as a bobbin-shaped member with a pair of support shafts protruding outward in the axial direction from the bobbin. The guide roller 5 has a body that receives the conveying chain 7, flanges formed at both axial ends of the body, and the aforementioned pair of support shafts protruding from the flanges at both axial ends of the body. The support shafts of the guide roller 5 are rotatably supported on the roller support base 4.

[0024] The conveyor chain 7 is provided to convey the slab S, which is fed out from the continuous casting machine 2, in the forward direction X1. In this embodiment, the conveyor chain 7 is a roller chain, and is made of, for example, steel. The conveyor chain 7 has an upper region 9 that is hung on the upper foundation 6 and moves in the forward direction X1, and a lower region 10 that is located below the upper region 9, is supported by the guide roller 5, and moves in the return direction X2. In addition, sprockets (not shown) are attached to both ends of the conveyor chain 7 in the reciprocating movement direction X. At least one of the sprockets is a drive sprocket that applies a driving force to the conveyor chain 7 to rotate it.

[0025] With the above configuration, the conveying chain 7 conveys the slab S by moving in the forward direction X1 in the upper region 9 located on the upper foundation 6. After conveying the slab S, the conveying chain 7 proceeds to the lower region 10 and moves in the return direction X2, where it is temporarily supported by the guide rollers 5 so as to be lifted upwards, and then returns to the upper region 9 again.

[0026] The conveying chain 7 includes a pair of inner link plates 11, 11, a pair of outer link plates 12, 12, a connecting pin 13 that connects the pair of inner link plates 11, 11 and the pair of outer link plates 12, 12, a roller 14 positioned on the outer circumference of the connecting pin 13, and a base 15 fixed to each of the link plates 11, 11, 12, 12.

[0027] In the conveying chain 7, multiple pairs of inner link plates 11, 11 are provided, as well as multiple pairs of outer link plates 12, 12.

[0028] The conveyor chain 7 is formed by connecting a pair of inner link plates 11,11 and a pair of outer link plates 12,12 with connecting pins 13 to form a unit, and this unit is repeatedly arranged in the longitudinal direction of the conveyor chain 7 to form an endless chain. That is, the pair of inner link plates 11,11 and the pair of outer link plates 12,12 are arranged alternately along the longitudinal direction of the conveyor chain 7.

[0029] The pair of inner link plates 11, 11 are spaced apart in the width direction Y of the conveyor chain 7. Each of the pair of inner link plates 11, 11 is formed in a flat plate shape and is elongated in the longitudinal direction of the conveyor chain 7. Through holes are formed in both ends of each inner link plate 11, 11 in the longitudinal direction of the conveyor chain 7.

[0030] The pair of outer link plates 12, 12 are spaced apart in the width direction Y of the conveyor chain 7. Each of the pair of outer link plates 12, 12 is formed in a flat shape and is elongated in the longitudinal direction of the conveyor chain 7. Through holes are formed in both ends 122, 122 of each outer link plate 12, 12 in the longitudinal direction of the conveyor chain 7. The spacing between the pair of outer link plates 12, 12 is wider than the spacing between the pair of inner link plates 11, 11, and they are arranged to sandwich adjacent pairs of inner link plates 11, 11 in the width direction Y. With this arrangement, each end 122 of each outer link plate 12, 12 in the longitudinal direction of the conveyor chain 7 is located outside in the width direction Y relative to the inner link plates 11, 11. As a result, there is space between two adjacent outer link plates 12, 12 in the longitudinal direction of the conveyor chain 7 for positioning the chain lifting jig 20.

[0031] Multiple connecting pins 13 are provided. The connecting pins 13 pass through the through holes of each of the pair of outer link plates 12, 12 and the through holes of each of the pair of inner link plates 11, 11 sandwiched between the pair of outer link plates 12, 12, and are fixed to the pair of outer link plates 12, 12 by, for example, press-fitting. The pair of outer link plates 12, 12 and the pair of inner link plates 11, 11 are rotatable relative to each other around the connecting pins 13. Rollers 14 are fitted onto each connecting pin 13 and positioned between the pair of inner link plates 11, 11.

[0032] The base 15 is fixed to each pair of inner link plates 11,11 and each pair of outer link plates 12,12. The base 15 is positioned on the outer circumference of the conveyor chain 7 and is fixed to the corresponding link plates 11,11;12,12. The outer surface 151 of the base 15 is formed to be flat. A slab support 152 is formed in the central part of this outer surface 151 in the width direction Y, projecting radially outward from the conveyor chain 7. The slab support 152 is the part that directly contacts the slab S and receives the weight of the slab S, and in this embodiment, it is formed as an elongated rectangle in the width direction Y in a cross section perpendicular to the chain conveying direction.

[0033] In the slab cooler 1 having the above configuration, the guide rollers 5 need to be replaced periodically. Therefore, during maintenance of the slab cooler 1, it is necessary to lift the lower region 10 of the conveyor chain 7 from the guide rollers 5. In this embodiment, the conveyor chain 7 is a large chain, and the load on the part that is lifted when the guide rollers 5 are replaced is close to 10 tons. In order to lift this heavy lower region 10, a chain lifting jig 20 is used in this embodiment. That is, the chain lifting jig 20 is for lifting the lower region 10 of the conveyor chain 7 which has a pair of link plates 11,11;12,12 arranged parallel to each other.

[0034] In this embodiment, the chain lifting jig 20 is a highly rigid member formed in a U-shape. The chain lifting jig 20 is also formed in a shape that allows it to be positioned between two outer link plates 12, 12 that are aligned in the reciprocating movement direction X in the lower region 10. The chain lifting jig 20 is a member that weighs, for example, about 20 kg to 30 kg and can be carried by a worker by hand. Furthermore, it is preferable that the chain lifting jig 20 is configured to be divisible into multiple members, as in this embodiment, as this improves the ease of handling by a worker.

[0035] In this embodiment, unless otherwise specified, the chain lifting jig 20 will be described in reference to the state in which the chain lifting jig 20 is attached to the conveying chain 7 in order to lift the lower region 10 of the conveying chain 7.

[0036] The chain lifting jig 20 has a pair of side walls 21, 21 of a pair of outer link plates 12, 12 for receiving the longitudinal end 122 of the conveying chain 7 in the longitudinal direction of the chain, a bottom wall 22 fixed to the side walls 21, 21 for receiving the conveying chain 7 from below, and a hanging part 23 on which a lifting device 50 such as a chain block 53 for lifting the chain lifting jig 20 is hung.

[0037] The side walls 21,21 are used as parts that hook onto the pair of outer link plates 12,12. The side walls 21,21 are positioned to sandwich the pair of inner link plates 11,11 in the lower region 10 in the width direction Y. In this embodiment, the side walls 21,21 are formed in a shape that is symmetrical in the width direction Y.

[0038] Each side wall 21, 21 has a side plate 24 having one side surface 241 that is positioned to face the outer surface 112 of the corresponding inner link plates 11, 11 of the conveyor chain 7, and a side projection 25 that protrudes from this side surface 241 and is positioned to contact the longitudinal end 122 of the corresponding outer link plate 12.

[0039] In this embodiment, the side plate 24 is formed in a vertically elongated shape, with its vertical length being longer than its length in the reciprocating movement direction X. In this embodiment, the side plate 24 is in close proximity to the base 15. In this embodiment, the side plate 24 is made of channel steel and has a flat portion 242 facing the inner link plate 11, and a pair of rising portions 243, 243 that rise in the width direction Y from both ends of the flat portion 242 in the reciprocating movement direction X. Note that the rising portions 243 may be omitted. A bolt hole 244 is formed as a through hole in the lower part of the flat portion 242.

[0040] The side projection 25 protrudes from one side surface 241 (inner surface) of the side plate 24 toward the conveying chain 7. The side projection 25 is adjacent in the reciprocating direction X to the longitudinal end 122 of the corresponding outer link plate 12, 12, and is positioned to contact this end 122. Preferably, the amount of protrusion of the side projection 25 from the side plate 24 is less than the thickness of the outer link plate 12 and does not come into contact with the inner link plates 11, 11. In this embodiment, the side projection 25 is formed of channel steel, but it may be formed of a material other than channel steel. The hanging portion 23 protrudes from the outer surface of the side plate 24.

[0041] The hanging portion 23 is fixed to the side plate 24 by welding or the like. In this embodiment, the hanging portion 23 is a plate member with the reciprocating movement direction X as the thickness direction. In this embodiment, the hanging portion 23 protrudes outward in the width direction Y from the rising portions 243, 243 of the side plate 24. In this embodiment, the hanging portion 23 is positioned in the center of the side plate 24 in the reciprocating movement direction X and is located above the bolt holes 244.

[0042] In the hanging portion 23, a through-hole, the hanging hole 231, is formed at a position extending from the rising portion 243, 243 toward the outside of the conveying chain 7 in the width direction Y. The hanging hole 231 is a hole through which, for example, a shackle 51 is passed.

[0043] The bottom wall 22 supports the weight of the lower region 10 of the conveyor chain 7 and is a member that supports the pair of side walls 21, 21. In this embodiment, each side wall 21, 21 and the bottom wall 22 are fixed to each other in a removable manner, but each side wall 21, 21 and the bottom wall 22 may be fixed in a non-separable manner by welding or the like.

[0044] The bottom wall 22 includes a bottom upper plate 27 positioned directly below a pair of inner link plates 11, 11, a pair of bottom projections 28, 28 positioned spaced apart in the thickness direction (chain width direction Y) of the side walls 21, 21 so as to protrude above the bottom upper plate 27 and to contact the conveying chain 7, a pair of end plates 29, 29 and a middle plate 30 protruding downward from the bottom upper plate 27, a bottom lower plate 31 fixed to the lower ends of the end plates 29, 29 and the middle plate 30, and a vertical plate 32 positioned on one side of the reciprocating movement direction X in the bottom wall 22.

[0045] The bottom plate 27 is a flat plate-shaped portion and is positioned below the lower region 10 of the conveying chain 7. In this embodiment, although the bottom plate 27 is positioned directly below the lower region 10 of the conveying chain 7, it does not come into contact with the conveying chain 7. Bottom protrusions 28, 28 are fixed to the bottom plate 27. The bottom protrusions 28, 28 project upward toward the bottom plate 27.

[0046] The bottom protrusions 28, 28 are the parts that support the base 15 of the conveyor chain 7 while avoiding the slab support 152 of the base 15. The bottom protrusions 28, 28 are arranged so as to sandwich the slab support 152 in the width direction Y. The upper surfaces of the bottom protrusions 28, 28 are preferably flat surfaces. These upper surfaces support the weight of the conveyor chain 7 by contacting the outer surface 151 (downward-facing surface) of the base 15. In this embodiment, the bottom protrusions 28, 28 are each formed of channel steel, but this is not required.

[0047] A middle plate 30 and a pair of end plates 29, 29 are arranged downward from the bottom upper plate 27, fixed to the bottom upper plate 27, and the bottom lower plate 31 is fixed below these plates 29, 30.

[0048] The pair of end plates 29, 29 are vertically oriented plate members positioned at both ends of the bottom wall 22 in the width direction Y. Each of the pair of end plates 29, 29 has a bolt hole 291 formed therein as a through hole. The bolt hole 291 may have an outer diameter larger than the outer diameter of the bolt 33, which will be described later, or it may be a female threaded hole that is screw-connected to the bolt 33.

[0049] The intermediate plate 30 is positioned between a pair of end plates 29, 29. In this embodiment, three intermediate plates 30 are provided. In this embodiment, the intermediate plates 30 are positioned below each bottom projection 28, 28 and in the center of the bottom wall 22 in the width direction Y. With the above configuration, the bottom wall 22 has high rigidity.

[0050] The bottom wall 22 and each side wall 21, 21 are fixed together using bolts 33 as fixing members. Specifically, the bolts 33 are passed through bolt holes 244 and 291 on one side wall 21 and the bottom wall 22 that face each other in the width direction Y. If the bolt holes 291 in the bottom wall 22 are not female threaded holes, nuts are placed on the inner surface of the end plate 29 and connected to the bolts 33, thereby fastening the bottom wall 22 to one side wall 21. The bottom wall 22 and the other side wall 22 are fixed together in the same manner as described above.

[0051] The bottom wall 22 and the side walls 21, 21 may be fixed together using pins or other fastening members other than bolts.

[0052] Next, with reference to Figures 3 to 6, the operation of lifting the area around the guide roller 5 in the lower region 10 of the conveyor chain 7 will be described. In this lifting operation, a shackle 51, a wire 52, and a chain block 53 are used as lifting equipment 50. In this lifting operation, the worker wraps a fixing band 54 made of metal wire or metal chain around the upper foundation 6 and the upper region 9 of the conveyor chain 7. Next, the worker hooks the upper end hook 531 of the chain block 53 onto the fixing band 54. As a result, the lower end hook 532 of the chain block 53 is positioned near the lower region 10 around the guide roller 5.

[0053] Next, the worker transports the chain lifting jig 20 to the vicinity of the guide roller 5, either with the bottom wall 22 and the side walls 21,21 separated, or with the bottom wall 22 and the side walls 21,21 fixed together. If the bottom wall 22 and the side walls 21,21 are separated, the worker fixes the bottom wall 22 and the side walls 21,21 together using bolts 33. Next, the worker attaches the shackles 51 to the hooking holes 231,231 of the pair of hooking parts 23,23, respectively.

[0054] Next, the worker lifts the chain lifting jig 20, positioning the pair of side walls 21, 21 adjacent to the longitudinal ends 122 of the pair of outer link plates 12, 12, and positioning the bottom wall 22 below the lower region 10. At this time, the side projections 25 of the side walls 21, 21 face the longitudinal ends 122 of the pair of outer link plates 12, 12 in the reciprocating direction X. Also, the bottom projections 28, 28 of the bottom wall 22 come into contact with the outer surface 151 of the base 15 of the conveying chain 7. Note that the slab support 152 of the base 15 of the conveying chain 7 is positioned so as not to come into contact with the chain lifting jig 20.

[0055] Next, the wires 52, 52 are attached to the shackles 51 that are hooked onto the hooking section 23, and these wires 52, 52 are then attached to the hooks 532 at the lower end of the chain block 53. Then, the lower area 10 is lifted using the shackles 51. In this way, the chain lifting jig 20 is lifted using the shackles 51, the wires 52, 52 and the chain block 53. This allows the ends 122 of the pair of outer link plates 12, 12 to be hooked onto the side walls 21, 21 of the chain lifting jig 20, while the conveying chain 7 is lifted by the bottom wall 22. Note that this lifting operation of the conveying chain 7 is performed simultaneously at two locations on either side of the guide roller 5 in the reciprocating movement direction X. As a result, the conveying chain 7 can be lifted away from the guide roller 5, as shown in Figure 4.

[0056] As described above, according to this embodiment, the pair of side walls 21, 21 of the chain lifting jig 20 receive the longitudinal ends 122 of the pair of outer link plates 12, 12, so that the chain lifting jig 20 catches on the lower region 10 of the conveyor chain 7, preventing the chain lifting jig 20 from slipping off the conveyor chain 7. In this state, when the chain lifting jig 20 is lifted by the chain block 53 attached to the hooking portion 23, the chain lifting jig 20 lifts the conveyor chain 7 at its bottom wall 22, and the conveyor chain 7 can be lifted in a stable position while being prevented from slipping by the side walls 21, 21. The chain lifting jig 20 is plate-shaped and does not stretch like a wire, so no setup change (position adjustment) is required when lifting the conveyor chain 7. Furthermore, when the conveyor chain 7 is lifted by the chain lifting jig 20 at a point where it is angled, the side walls 21, 21 catch on the outer link plates 12, 12. This prevents the conveyor chain 7 from slipping off the chain lifting jig 20. Moreover, since the chain lifting jig 20 is formed from thick plates, it prevents the chain lifting jig 20 from getting caught in the joints of the conveyor chain 7. This reduces the effort required to lift large chains.

[0057] Furthermore, according to this embodiment, the lifting operation of the lower region 10 of the conveyor chain 7 must be performed in a narrow gap (a narrow gap of about 1 m in height or less) between the lower foundation 3 and the upper foundation 6. In such a narrow space, if the lower region 10 is lifted by wire without using the chain lifting jig 20, the wire will stretch considerably, requiring multiple wire adjustments (position adjustments) during lifting. On the other hand, when the lower region 10 of the conveyor chain 7 is lifted using the chain lifting jig 20, such problems can be avoided, and the lifting operation of the heavy lower region 10 of the conveyor chain 7 located in a narrow space can be performed in a short time.

[0058] Furthermore, according to this embodiment, the side walls 21, 21 and the bottom wall 22 are fixed to each other in a detachable manner. With this configuration, the side walls 21, 21 and the bottom wall 22, which are made of steel or the like and are therefore heavy due to their high rigidity, can be carried individually. Thus, the labor required of workers handling the chain lifting jig 20 can be reduced.

[0059] Furthermore, according to this embodiment, the side protrusions 25 that project from one side surface 241 of the side plate 24 are configured to contact the longitudinal ends 122 of the pair of outer link plates 12, 12. With this configuration, the side protrusions 25 that project from the side plate 24 allow the chain lifting jig 20 to be more securely attached to the longitudinal ends 122 of the pair of outer link plates 12, 12. Thus, the slippage of the conveying chain 7 relative to the chain lifting jig 20 can be more reliably prevented.

[0060] Furthermore, according to this embodiment, a pair of bottom protrusions 28, 28, which are spaced apart in the width direction Y of the bottom wall 22, support the weight of the conveying chain 7. With this configuration, the chain lifting jig 20 can support the conveying chain 7 at a location on the base 15 of the conveying chain 7 that avoids the slab cooler 1 that protrudes downward.

[0061] The embodiments described above illustrate an example of the present invention. However, the present invention can be modified in various ways within the scope of the claims.

[0062] For example, instead of the configuration of the above embodiment, the side plates 24 of each of the pair of side walls 21, 21 may be directly attached to the longitudinal ends 122 of the pair of outer link plates 12, 12. Alternatively, instead of the configuration of the above embodiment, the bottom plate 27 of the bottom wall 22 may be in direct contact with the lower region 10 of the conveying chain 7. Alternatively, only one of the pair of side walls 21, 21 may be attached to the conveying chain 7. [Industrial applicability]

[0063] The present invention can be widely applied to chain lifting jigs and chain lifting methods. [Explanation of symbols]

[0064] 7. Conveyor chain (chain) 11,12 Link Plate 20 Chain lifting jig 21 Side wall 22 Bottom wall 23 Hanging part 24 Side Plates 25 Side protrusion 27. Bottom plate (bottom plate) 28 Bottom protrusion 50 Lifting equipment 122 Longitudinal end side wall 241 One side

Claims

1. A chain lifting jig for lifting a chain having a pair of link plates arranged parallel to each other, The link plate includes a side wall for receiving the longitudinal end of the chain, A bottom wall fixed to the side wall and receiving the chain from below, A hanging section on which a lifting device for lifting the chain lifting jig is attached, Equipped with, The chain lifting jig comprises a side wall having a side plate with one side facing the side of the link plate, and a side projection that protrudes from the one side and is positioned to contact the end of the link plate.

2. A chain lifting jig for lifting a chain having a pair of link plates arranged parallel to each other, The link plate includes a side wall for receiving the longitudinal end of the chain, A bottom wall fixed to the side wall and receiving the chain from below, A hanging section on which a lifting device for lifting the chain lifting jig is attached, Equipped with, A chain lifting jig, wherein the bottom wall comprises a bottom plate positioned below the pair of link plates, and a pair of bottom projections positioned spaced apart in the thickness direction of the side wall so as to protrude above the bottom plate and to contact the chain.

3. The chain lifting jig according to claim 1 or claim 2, wherein the side wall and the bottom wall are detachably fixed to each other.

4. A chain lifting method using a chain lifting jig, The chain lifting jig is a chain lifting jig for lifting a chain having a pair of link plates arranged parallel to each other, The link plate includes a side wall for receiving the longitudinal end of the chain, A bottom wall fixed to the side wall and receiving the chain from below, A hanging section on which a lifting device for lifting the chain lifting jig is attached, Equipped with, The chain lifting method is characterized in that the side wall of the jig is positioned adjacent to the end of the chain, the bottom wall is positioned below the chain, and then the chain lifting jig is lifted using a lifting device attached to the hooking portion, thereby lifting the chain with the bottom wall while hooking the end of the link plate onto the side wall.

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