Lifting aids and methods for lifting metal materials

Abstract

To simplify the work of hanging a metallic material 2.SOLUTION: A hanging auxiliary tool 1 used for hanging a metal material 2 is a metal plate-like member, has a first surface 3a and a second surface 3b opposite to the first surface 3a, the metal material 2 is a bottom board 3 which is loaded on a second surface 3b side and a rod-like member made of a different material from the bottom board 3, two or more first spacers 4 fixed in parallel to a first surface 3a side of the bottom board 3 is provided.SELECTED DRAWING: Figure 3B

Description

Technical Field

[0001] The present invention relates to a lifting aid and a method for lifting a metal material.

Background Art

[0002] Metal materials such as slabs are loaded onto a transporter such as a ship or unloaded from the transporter. At this time, a lifting tool may be used to lift (hoist, lower) the metal material (Patent Document 1). The lifting tool includes, for example, a pair of legs and a claw provided at the tip of the legs. The pair of claws is inserted into the bottom surface of the metal material, and the lifting tool is lifted using a crane or the like. Thereby, the metal material can be hoisted into mid-air.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Conventionally, from the viewpoint of cost reduction and the like, it has been required to simplify the working process when lifting (hoisting or lowering) a metal material. Therefore, an object of the present invention is to simplify the work of lifting a metal material.

Means for Solving the Problems

[0005] As a result of intensive studies, the present inventors have found that the above object can be achieved by adopting the following configuration, and have completed the present invention. That is, the present invention provides the following [1] to [5]. [1] A lifting aid for use in suspending metal materials, comprising: a metal plate-shaped member having a first surface and a second surface opposite to the first surface, on which the metal material is loaded on the second surface side; and two or more rod-shaped members made of a different material from the base plate, fixed parallel to the first surface side of the base plate. [2] The lifting aid according to [1], wherein the rod-shaped member is made of a different material from the base plate and further comprises two or more second spacers fixed parallel to the second surface side of the base plate, and the metal material is loaded onto the second surface side of the base plate via the second spacers. [3] The first spacer and the second spacer are arranged in positions that do not overlap each other via the base plate, as described in [2] above. [4] The lifting aid described in any of [1] to [3] above, wherein the metal material is a slab. [5] A method for suspending a metal material, comprising suspending the metal material using a suspension aid described in any of [1] to [4] above and a suspension device having a pair of claws, wherein the metal material is loaded on the second surface side of the base plate and the claws are inserted into the space between adjacent first spacers, and the suspension device is raised or lowered. [Effects of the Invention]

[0006] According to the present invention, the process of suspending metal materials can be simplified. [Brief explanation of the drawing]

[0007] [Figure 1A] This is a perspective view showing stacked metal materials. [Figure 1B] This is a side view showing stacked metal materials. [Figure 1C] This is a cross-sectional view along line AA' in Figure 1B. [Figure 2A] This is a cross-sectional view showing the process of lifting metal materials using a lifting device, with the upper lot shown in a lifted state. [Figure 2B]It is a cross-sectional view showing the process of lifting a metal material using a lifting tool, showing the state where the spacer between the upper lot and the lower lot has been removed. [Figure 2C] It is a cross-sectional view showing the process of lifting a metal material using a lifting tool, showing the state where the lower lot has been lifted. [Figure 2D] It is a cross-sectional view showing the process of lifting a metal material using a lifting tool, showing the state where the spacer between the lower lot and the horizontal plane has been removed. [Figure 3A] It is a perspective view showing the lifting assist tool of the first embodiment. [Figure 3B] It is a side view showing the lifting assist tool of the first embodiment. [Figure 3C] It is a cross-sectional view taken along the line B - B' of FIG. 3B. [Figure 4] It is a cross-sectional view showing a part of the lifting assist tool enlarged. [Figure 5A] It is a cross-sectional view showing the process of lifting a metal material using the lifting assist tool and the lifting tool, showing the state where the upper lot has been lifted. [Figure 5B] It is a cross-sectional view showing the process of lifting a metal material using the lifting assist tool and the lifting tool, showing the state where the lower lot has been lifted. [Figure 6A] It is a perspective view showing the lifting assist tool of the second embodiment. [Figure 6B] It is a side view showing the lifting assist tool of the second embodiment. [Figure 6C] It is a cross-sectional view taken along the line C - C' of FIG. 6B. [Figure 7] It is a side view showing the lifting assist tools of the second embodiment stored stacked.

Embodiments for Carrying Out the Invention

[0008] [Prior Art] First, the prior art will be described based on FIGS. 1A to 1C and FIGS. 2A to 2D.

[0009] FIG. 1A is a perspective view showing the stacked metal materials 2. FIG. 1B is a side view showing the stacked metal materials 2. FIG. 1C is a cross-sectional view taken along line A-A' of FIG. 1B. A plurality of stacked (three in FIGS. 1A to 1C) metal materials 2 constitute a single lot 6. In FIGS. 1A to 1C, upper and lower two-stage lots 6 (lot 6a, lot 6b) are arranged on the horizontal plane 9.

[0010] When the lot 6 is lifted using the lifting tool 21 (see FIGS. 2A to 2D), a space 7 for inserting the claw portion 23 of the lifting tool 21 is required below the bottom surface of the lot 6. Therefore, in FIGS. 1A to 1C, a spacer 31 is sandwiched between the upper lot 6a and the lower lot 6b, and another spacer 31 is also sandwiched between the lower lot 6b and the horizontal plane 9. The spacer 31 is, for example, a prismatic wood.

[0011] FIGS. 2A to 2D are cross-sectional views showing the process of lifting the metal material 2 using the lifting tool 21. As shown in FIG. 2A, the lifting tool 21 includes a pair of leg portions 22 and a claw portion 23 provided at the tip of the leg portions 22, and is connected to a crane (not shown).

[0012] First, as shown in FIG. 2A, the upper lot 6a is lifted. Specifically, the pair of claw portions 23 are inserted into the space 7 below the bottom surface of the lot 6a, and in that state, the lifting tool 21 is lifted using a crane. Thereby, the lot 6a is lifted. [[ID=……]] Thereafter, as shown in FIG. 2B, an operator (not shown) removes the spacer 31 sandwiched between the upper lot 6a and the lower lot 6b. Next, as shown in FIG. 2C, the lower lot 6b is lifted in the same manner as the upper lot 6a. Finally, as shown in FIG. 2D, the operator removes the spacer 31 sandwiched between the lower lot 6b and the horizontal plane 9. The removed spacer 31 is returned to, for example, a place different from the metal material 2 (lot 6) and stored.

[0013] Furthermore, when lowering rods 6a and 6b in sequence, first place the spacer 31 on the horizontal plane 9, then lower the suspension device 21 onto it to suspend rod 6a. Next, another spacer 31 is placed on top of the lowered rod 6a, and then rod 6b is lowered on top of that.

[0014] Thus, conventionally, when lifting (lowering) the metal material 2, in addition to the operation of the lifting device 21 to lift (lower) the metal material 2, work related to the spacer 31 (work to remove the spacer 31, work to place the spacer 31) is required.

[0015] In particular, when moving metal material 2 (lot 6) from inside the ship to outside, it is necessary to have separate personnel to remove the spacers 31 inside the ship and to return the removed spacers 31 to the storage location outside the ship, which makes the process more complicated.

[0016] Next, preferred embodiments of the present invention, made in view of the prior art described above, will be explained. First, the first embodiment will be described based on Figures 3A to 5B.

[0017] [First Embodiment] Figure 3A is a perspective view showing the suspension aid 1 of the first embodiment. Figure 3B is a side view showing the suspension aid 1 of the first embodiment. Figure 3C is a cross-sectional view taken along line BB' of Figure 3B. Figures 3A to 3C show the metal material 2 (lot 6) along with the lifting aid 1. The metal material 2 can be, for example, a slab of plate-shaped steel. The lifting aid 1 is used to lift (or lower) a lot 6 consisting of multiple stacked metal materials 2 (three in Figures 3A to 3C) all at once. Note that while multiple sheets (three sheets in Figures 3A to 3C) of metal material 2 stacked on top of each other are described as one lot 6, this is not the only way to define it. For example, multiple blocks (blocks made of metal material) arranged and fixed together may be considered one lot 6, or one large block may be considered one lot 6.

[0018] In Figures 3A to 3C, a lifting aid 1 is positioned between the upper rod 6a and the lower rod 6b. Furthermore, another lifting aid 1 is positioned between the lower rod 6b and the horizontal plane 9. The metal materials 2 (lot 6) and the lifting aid 1 are transported in an alternating stacked state, as shown in Figures 3A to 3C, and placed on a horizontal surface 9 such as a loading area.

[0019] The suspension support device 1 includes a base plate 3, which is a plate-shaped member. The base plate 3 has a first surface 3a and a second surface 3b opposite to the first surface 3a. Multiple stacked metal materials 2 are placed on the second surface 3b side of the base plate 3. The base plate 3 is made of metal. This ensures sufficient strength to support multiple stacked metal materials 2. When the metal material 2 is a slab, steel is preferred for the metal constituting the base plate 3 from the viewpoint of strength and cost.

[0020] From the viewpoint of avoiding contact between the claw portion 23 of the lifting device 21 and the metal material 2, it is preferable that the width of the base plate 3 (the distance in the left-right direction in Figure 3C) is greater than the width of the metal material 2. For similar reasons, it is preferable that the length of the base plate 3 (the distance in the left-right direction in Figure 3B) is greater than the length of the metal material 2.

[0021] In the first embodiment, it is preferable that the second surface 3b of the base plate 3 that contacts the metal material 2 has a certain degree of roughness. This is to fix the position of the metal material 2 that contacts the second surface 3b of the base plate 3 by friction and prevent the load from collapsing. As a base plate 3 made of steel and having a certain degree of roughness on the second surface 3b, a slab with scale adhering to its surface is a suitable example.

[0022] The suspension support device 1 further comprises a plurality of first spacers 4, which are rod-shaped members. Multiple first spacers 4 are fixed to the first surface 3a of the base plate 3 and are arranged parallel to each other.

[0023] Furthermore, descriptions of angles such as "parallel" and "horizontal" are concepts that include a technically permissible range of error (the same applies hereafter).

[0024] Figures 3A to 3C illustrate two first spacers 4 for each suspension aid 1, but the number of first spacers 4 is not particularly limited as long as there are two or more. However, as will be described later, the claw portion 23 of the suspension device 21 is inserted into the space 7 between adjacent first spacers 4. If there are too many first spacers 4, the space 7 may become narrow, so the number of first spacers 4 is selected appropriately according to the size of the claw portion 23, etc.

[0025] The thickness of the first spacer 4 (the vertical distance in Figure 3B) is such that it is possible to secure the space 7 into which the claw portion 23 fits.

[0026] It is preferable that the first spacer 4 is positioned along the direction in which the claw portion 23 of the suspension device 21 enters the space 7. That is, it is preferable that the longitudinal direction of the first spacer 4 and the direction in which the claw portion 23 enters the space 7 are parallel to each other. This makes it easier for the claw portion 23 to be inserted into the opening of the space 7.

[0027] The material of the first spacer 4 is different from the material of the base plate 3, which is metal (for example, steel). A rectangular prism-shaped piece of wood is preferred as the first spacer 4. This allows the first spacer 4 to suppress positional displacement with the metal material 2 it contacts through friction, and also makes it easier to ensure sufficient strength to support the metal material 2 and the base plate 3.

[0028] As described above, the first spacer 4 is fixed to the base plate 3. Based on Figure 4, the method for fixing the first spacer 4 to the base plate 3 will be explained. Figure 4 is a cross-sectional view showing a magnified portion of the suspension support device 1. One method for fixing the first spacer 4 to the base plate 3 is to use angle steel 11, which is a steel material with an L-shaped cross-section, as shown in Figure 4. In this case, specifically, first, a pair of angle steels 11 are welded to the first surface 3a of the base plate 3, while ensuring space for the first spacer 4 to fit into. Next, the first spacer 4 is fitted between the pair of angle steels 11 welded to the base plate 3 and secured using screws 12. In this way, the first spacer 4 is fixed to the first surface 3a of the base plate 3.

[0029] Furthermore, as long as a certain level of strength can be ensured (such as strength to support multiple metal materials 2, or strength to withstand friction with the metal materials 2 in contact), the method of fixing the first spacer 4 to the base plate 3 is not limited to the method described with reference to Figure 4.

[0030] The second spacer 5 (see Figures 6A to 6B), which will be described later, is also fixed to the base plate 3 in the same manner as the first spacer 4.

[0031] Next, a method for lifting the metal material 2 (lot 6) using the lifting aid 1 and lifting device 21 will be explained based on Figures 5A and 5B.

[0032] Figures 5A and 5B are cross-sectional views showing the process of lifting a metal material 2 using a lifting aid 1 and a lifting device 21. First, as shown in Figure 5A, the upper lot 6a is lifted. Specifically, a pair of claws 23 are inserted into the space 7 below the first surface 3a of the base plate 3 of the lifting aid 1, and in this state, the lifting device 21 is raised using a crane. As a result, the rod 6a is lifted. Next, as shown in Figure 5B, the lower lot 6b is lifted in the same manner as the upper lot 6a.

[0033] Furthermore, when lowering rods 6a and 6b in sequence, first the lifting device 21 is lowered to suspend rod 6a, along with the lifting support device 1, onto the horizontal plane 9. Then, similarly, rod 6b, along with the lifting support device 1, is suspended above the lowered rod 6a. As a result, the metal material 2 (lot 6) and the lifting aid 1 are once again stacked alternately (see Figures 3A to 3C), and are transported in this state to, for example, the destination.

[0034] According to this embodiment, the work performed by workers on the spacer 31 (see Figures 2B and 2D), which was necessary in the conventional technology, can be omitted. As a result, the work of lifting (or lowering) the metal material 2 can be simplified overall, and the number of workers can be reduced. Regarding the spacers 31, the process involves collecting them in bulk or returning them to storage, so omitting this step would significantly reduce the overall number of steps involved. Furthermore, since the work related to the spacer 31 is omitted and only the operation of the lifting device 21 (crane) remains, the entire work process can be mechanized.

[0035] Next, a second embodiment will be described based on Figures 6A to 7.

[0036] [Second Embodiment] Figure 6A is a perspective view showing the suspension aid 1 of the second embodiment. Figure 6B is a side view showing the suspension aid 1 of the second embodiment. Figure 6C is a cross-sectional view taken along line CC' of Figure 6B. The difference between the second embodiment of the suspension aid 1 and the first embodiment is that it further includes a plurality of second spacers 5, which are rod-shaped members. Multiple second spacers 5 are fixed parallel to the second surface 3b of the base plate 3. The fixing method is as described above.

[0037] Figures 6A to 6C illustrate two second spacers 5 for each suspension aid 1, but the number of second spacers 5 is not particularly limited as long as there are two or more. However, as will be described later, the claw portion 23 of the suspension device 21 may also be inserted into the space between adjacent second spacers 5, so the number of second spacers 5 should be selected appropriately according to the size of the claw portion 23, etc.

[0038] The metal material 2 (lot 6) is loaded onto the second surface 3b side of the base plate 3 via the second spacer 5. The material of the second spacer 5 is different from the metal material of the base plate 3. For the same reasons as for the first spacer 4, a rectangular prism-shaped piece of wood is preferably used for the second spacer 5.

[0039] In the second embodiment, the method for lifting (or lowering) the metal material 2 (lot 6) using the lifting aid 1 and the lifting device 21 is the same as in the first embodiment (see Figures 5A to 5B), so a description will be omitted.

[0040] In the second embodiment, the claw portion 23 can be inserted into the space between adjacent second spacers 5, and in that state, the lifting device 21 can be raised to lift only the metal material 2 (lot 6) and detach it from the lifting aid 1. In this case, the detached lifting aid 1 can be stored in the metal material 2 (lot 6).

[0041] Figure 7 is a side view showing the second embodiment of the lifting aid 1 being stored in a stacked configuration. The first spacer 4 and the second spacer 5 are arranged parallel to each other. Furthermore, as shown in Figure 7, it is preferable that the first spacer 4 and the second spacer 5 are positioned so as not to overlap each other, via the base plate 3. Moreover, it is preferable that the thickness of the second spacer 5 (the vertical distance in Figure 7) is smaller than the thickness of the first spacer 4. As a result, as shown in Figure 7, the lower second spacer 5 can be housed in the upper space 7, allowing multiple lifting aids 1 to be compactly stored. [Explanation of symbols]

[0042] 1: Lifting aid 2: Metal material 3: Floor plate 3a: 1st page 3b: 2nd side 4: First spacer 5: Second spacer 6: Lot 7: Space 9: Horizontal plane 11: Angle steel 12: Screws 21: Lifting equipment 22: Legs 23: Nail area 31: Spacer

Claims

1. A lifting aid used for suspending metal materials, A metal plate-shaped member having a first surface and a second surface opposite to the first surface, the base plate on which the metal material is loaded on the second surface side, A rod-shaped member made of a different material from the base plate, comprising two or more first spacers fixed parallel to the first surface side of the base plate, A hanging aid in which the first spacer is made of wood.

2. A rod-shaped member made of a different material from the base plate, further comprising two or more second spacers fixed parallel to the second surface side of the base plate, The lifting aid according to claim 1, wherein the metal material is loaded onto the second surface side of the base plate via the second spacer.

3. The lifting aid according to claim 2, wherein the first spacer and the second spacer are arranged in positions that do not overlap each other, via the base plate.

4. The lifting aid according to claim 1, wherein the metal material is a slab.

5. A method for suspending a metal material, comprising suspending the metal material using a suspension aid according to any one of claims 1 to 4 and a suspension device having a pair of claws, A method for suspending a metal material, wherein the metal material is loaded onto the second surface side of the base plate, and the claw portion is inserted into the space between adjacent first spacers, and the suspension device is raised or lowered.

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