Steel plate sheet lifting device

Abstract

To provide a steel sheet lifting device with a simple structure capable of lifting stacked steel plates one by one using a catch to clamp both side end surfaces of the steel plate and a clamp to support the bottom surface of the steel plate.SOLUTION: A frame body 1 is provided with a catch shaft 5 and a clamp shaft 6 spaced apart according to the width of a steel plate. A driving catch 7 and a driven clamp 8 are attached to the catch shaft 5. A driven catch 16 and a driving clamp 17 are attached to the clamp shaft 6. The driving catch 7 is rotated by driving the catch shaft 5 with a catch motor 25 and the driving clamp 17 is rotated by driving the clamp shaft 6 with a clamp motor 26. Each of the driven catch 16 and the driven clamp 8 follow the driving catch 7 and the driving clamp 17 and is connected to connection links 33, 34 so as to rotate in the opposite direction.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a steel plate sheet lifting device that can lift and transport steel plates, such as large iron sheets to be laid at a construction site, one sheet at a time from a stacked state. [Background technology]

[0002] Conventionally, when multiple (e.g., 100) stacked steel plates, e.g., 1520 mm wide, 6100 mm long, and 25 mm thick, are sling-loaded and transported, devices using electromagnets or wire-based lifting devices are known. In the case of electromagnet-based devices, it is necessary to determine a position where the plates can be lifted in a balanced manner using the magnetic force of the electromagnet. Because the steel plates are stacked above eye level, this task requires the operator to stand on a suitable platform or stand on the steel plate, mark the center of the plate, visually determine the lifting position using the center as a reference, and check the balance after lifting. Determining the lifting position can be difficult. Depending on the strength of the magnet, sometimes no plates are lifted, and sometimes only two or three plates are lifted. When using wires or lifting devices, it is necessary to insert square timber or other materials between the stacked steel plates to create space for the wires or lifting devices, which is tedious work and requires the operator to check the balance after lifting. Furthermore, if the steel plate is simply lifted and transported, there is a risk that it may fall during transportation.

[0003] Slab tongs with fall prevention hooks are known, which lift stacked slabs one by one and are equipped with hooks to prevent them from falling (see, for example, Patent Documents 1 and 2). The device described in Patent Document 1 has slab clamping members and slab locking claws. The clamping members first clamp both sides of the slab and lift it to a predetermined height. The slab locking claws then rotate, causing their toes to penetrate the undersides of both sides of the slab to support the slab downward and prevent it from falling. However, the device described in Patent Document 1 requires individual claw movement means using electric motors for driving the slab locking claws. When lifting large steel plates such as those described above, multiple clamping members and slab locking claws must be distributed around the front, back, left, and right of the steel plate to ensure balanced lifting. This requires multiple individual electric motors, making the device complex and uneconomical. In the device described in Patent Document 2, the curved claws for preventing slabs from falling are driven by a motor provided for each curved claw, so the configuration is as complex as the device in Patent Document 1 above and cannot be said to be satisfactory. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 9-58965 (paragraphs 0013, 0018, 0019, Figures 1 and 4). [Patent Document 2] Jpn. Jpn. Appl. KOKAI Publication No. 6386 / 1981 (column 3, lines 14-24, Figures 1 and 3). Summary of the Invention [Problem to be solved by the invention]

[0005] The problem to be solved by the present invention is to provide a steel plate sheet lifting device that has a simple and economical configuration and can lift large stacked steel plates, such as iron sheets, one by one and transport them to a predetermined location without dropping them. [Means for solving the problem]

[0006] According to the present invention, a lifting machine comprises a frame body shaped along the longitudinal direction of a steel plate to be lifted, a catch shaft and a clamp shaft extending along the longitudinal direction of the frame body and arranged in parallel at an interval corresponding to the width of the steel plate, a plurality of drive catches and a plurality of driven clamps attached at least to the front and rear in the longitudinal direction of the catch shaft to clamp the end face of the steel plate and to support the underside of the steel plate, a plurality of driven catches and a plurality of drive clamps attached at least to the front and rear in the longitudinal direction of the clamp shaft to clamp the end face of the steel plate and to support the underside of the steel plate, a catch motor attached to the frame body to drive the catch shaft, and a clamp motor attached to the frame body to drive the clamp shaft, a driven catch attached to the clamp shaft is connected to the drive catch so as to rotate in the opposite direction following the drive catch; the drive clamp is fixed to the clamp shaft so as to rotate by the clamp motor, and the driven clamp attached to the catch shaft is connected to the drive clamp so as to rotate in the opposite direction following the drive clamp; the catch motor is driven to rotate the drive catch and driven catch to clamp both end surfaces of the steel plate and lift up the frame body, and then the clamp motor is driven to rotate the drive clamp and driven clamp to support the underside of the steel plate.

[0007] The steel plate sheet lifting device is provided with guide pieces around the frame body to guide the frame body onto the stacked steel plates as it descends, position adjustment bolts are provided on the underside of the frame body so as to contact the topmost steel plate, and protrusions are provided on the clamping surfaces of the catches that contact the sides of the steel plates so as to get between the topmost steel plate and the steel plate below it. [Effects of the Invention]

[0008] The present invention is configured as described above, and includes a frame body shaped to follow the longitudinal direction of the steel plate to be lifted, and a catch shaft and a clamp shaft extending longitudinally and arranged in parallel at a distance corresponding to the width of the steel plate. A plurality of drive catches for clamping the end faces of the steel plate and a plurality of driven clamps for supporting the underside of the steel plate are attached at least to the front and rear of the catch shaft in the longitudinal direction. Furthermore, a plurality of driven catches for clamping the end faces of the steel plate and a plurality of drive clamps for supporting the underside of the steel plate are attached at least to the front and rear of the clamp shaft in the longitudinal direction. The frame body is provided with a catch motor for driving the catch shaft and a clamp motor for driving the clamp shaft. The drive catch is fixed to the catch shaft so as to rotate when driven by the catch motor, and a driven catch attached to the clamp shaft is connected to the drive catch so as to rotate in the opposite direction following the drive catch. The drive clamp is fixed to the clamp shaft so as to rotate when driven by the clamp motor, and the drive clamp is connected to a driven clamp attached to the catch shaft so as to rotate in the opposite direction following the drive clamp. With this configuration, by driving the catch motor, the drive catches and the driven catches can be simultaneously rotated in opposite directions, i.e., in directions in which the tips of the drive catches and the driven catches approach or move apart. By rotating them in the approaching direction, both end surfaces of the steel plate can be clamped. In this state, the frame body can be raised to lift the steel plate. Then, by driving the clamp motor, the drive clamps and the driven clamps can be simultaneously rotated in opposite directions, i.e., in directions in which the tips of the drive clamps and the driven clamps approach or move apart. Therefore, when the steel plate has been appropriately raised, by rotating the drive clamps and the driven clamps in the directions in which the tips approach each other, the underside of the steel plate can be supported by the clamps, and the steel plate can be suspended to prevent it from falling.

[0009] Furthermore, if guide pieces are provided around the frame body to guide the frame body onto the stacked steel plates when it is lowered, the positions of the frame body and the stack can be accurately aligned, resulting in efficient work. If position adjustment bolts that come into contact with the topmost steel plate are provided on the underside of the frame body, the frame body can be lowered to the correct height, and if protrusions are provided on the clamping surfaces of the catches that come into contact with the sides of the steel plates so that they can fit between the topmost steel plate and the steel plates below it, slippage will not occur when the steel plates are lifted. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a plan view showing an embodiment of the present invention. [Figure 2] Front view. [Figure 3] FIG. 10 is a side view illustrating the relationship between the catch and the clamp. [Figure 4] FIG. [Figure 5] Showing the drive catch, (A) is a front view and (B) is a side view. [Figure 6] Shows the driven clamp, (A) is a front view and (B) is a side view. [Figure 7] Shows the follower catch, (A) is a front view and (B) is a side view. [Figure 8] (A) shows a front view and (B) shows a side view of the drive clamp. [Figure 9] An explanatory diagram of the state when the tips of the catches are separated. [Figure 10] FIG. 10 is an explanatory diagram of the state in which the tips of the catches have rotated in the direction in which they approach each other and the steel plate has been clamped. [Figure 11] FIG. 10 is an explanatory diagram of a state in which the tips of the clamps are spaced apart. [Figure 12] FIG. 10 is an explanatory diagram of a state in which the tips of the clamps are rotated in a direction approaching each other and the lower surface of the steel plate is supported. DETAILED DESCRIPTION OF THE INVENTION

[0011] 1 to 4 show one embodiment of the present invention. The frame body 1 is generally rectangular and shaped to fit the longitudinal direction of the steel plate 2 to be lifted. Preferably, four corners are provided with lifting sections 4 for engaging hooks 3 attached to the ends of crane wires. On both sides of the frame body 1, a catch shaft 5 and a clamp shaft 6 are provided, extending along the longitudinal direction of the frame body 1. The distance between the catch shaft 5 and the clamp shaft 6 is set at a distance that roughly corresponds to the width of the steel plate 2, and each shaft is rotatably supported by a plurality of bearings. For ease of understanding, the bearings are omitted from the drawings. A guide piece 39 is protruding from the side of the frame body 1 to align the frame body 1 with the periphery of the stacked steel plates 2, and a position adjustment bolt 40 is provided to adjust the distance between the steel plate 2 and the frame body 1.

[0012] 4, at least at the front and rear of the catch shaft 5 in the longitudinal direction, a plurality of drive catches 7, two in this embodiment, that clamp the side end faces of the steel plate 2, and a plurality of driven clamps 8, two in this embodiment, that support the underside of the steel plate 2, are attached. The number of drive catches 7 and driven clamps 8 that are installed can be increased or decreased as appropriate depending on the size, weight, etc. of the steel plate 2 to be lifted.

[0013] As shown in Figure 5, the driving catch 7 has a mounting hole 9 with a key groove approximately in the center of the plate-like body, and a clamping surface 10 is formed on the side, with uneven protrusions 11 formed on the clamping surface 10 so as to fit between the upper and lower stacked steel plates. A reinforcing piece 12 is fixed to the flat portion if desired, but the reinforcing piece 12 can also be omitted. Also, in Figure 5, a connection hole 35 is formed below the mounting hole 9 with a key groove for connecting a catch connecting link 33, which will be described later.

[0014] As shown in Figure 6, the driven clamp 8 has a mounting hole 13 located approximately in the center of the plate-like body, and a hook portion 14 formed on one end for supporting the underside of the steel plate 2, and a reinforcing piece 15 is fixed thereto if desired, although the reinforcing piece 15 may not be used. Also, in Figure 6, a connection hole 36 is formed above the mounting hole 13 for connecting a clamp connecting link 34, which will be described later.

[0015] At least at the front and rear of the clamp shaft 6 in the longitudinal direction, a plurality of driven catches 16, two in this embodiment, that clamp the side end faces of the steel plate 2, and a plurality of drive clamps 17, two in this embodiment, that support the underside of the steel plate 2, are attached. The number of these driven catches 16 and drive clamps 17 can be increased or decreased as appropriate depending on the size, weight, etc. of the steel plate 2 to be lifted.

[0016] As shown in Figure 7, the driven catch 16 has a mounting hole 18 approximately in the center of its plate-like body, and a clamping surface 19 is formed on its side, with uneven protrusions 20 formed on the clamping surface 19 so as to fit between the upper and lower stacked steel plates. A reinforcing piece 21 is fixed to the flat portion as desired, but the reinforcing piece 21 can also be omitted. Also, in Figure 7, a connection hole 37 is formed above the mounting hole 18 to connect a catch connecting link 33.

[0017] As shown in Figure 8, the driving clamp 17 has a mounting hole 22 with a key groove at approximately the center of the plate-like body, and a hook portion 23 is formed on one end for supporting the underside of the steel plate 2, and a reinforcing piece 24 is fixed thereto if desired, but the reinforcing piece 24 may not be used. Also, in Figure 8, a connection hole 38 for connecting a clamp connecting link 34 is formed below the mounting hole 22 with the key groove.

[0018] The frame body 1 is provided with a catch motor 25 for driving the catch shaft 5 and a clamp motor 26 for driving the clamp shaft 6. A gear motor with a reducer is preferably used as these motors, but other appropriate motors can also be used. In the embodiment shown in FIG. 4 , a drive arm 27 is connected to the drive shaft of the catch motor 26, a connecting link 28 is connected to the drive arm 27, and the connecting link 28 is connected to a catch shaft arm 29 fixed to the catch shaft 5 with a key. When the catch motor 25 is driven, the catch shaft 5 rotates. However, the catch shaft 5 can also be directly driven by an appropriate gear-driven transmission device, chain mechanism, or other mechanism. Note that stoppers (not shown) can be provided at appropriate positions to limit the rotation range of the arms and links. When the catch shaft 5 rotates, the drive catch 7, which is fixed to the catch shaft 5 with a key or the like, rotates together with the drive catch 7. However, the driven clamp 8, which is not fixed to the catch shaft 7, does not rotate together with the catch shaft 5 because it idles.

[0019] A drive arm 30 is also connected to the drive shaft of the clamp motor 26, and a connecting link 31 is connected to the drive arm 30, which is connected to a clamp shaft arm 32 fixed to the clamp shaft 6 with a key. The clamp shaft 6 is rotated by the drive of the clamp motor 26, but the clamp shaft 6 can also be driven directly by an appropriate gear-driven transmission device, chain mechanism, or other mechanism. Stoppers (not shown) can be provided at appropriate positions to limit the range of rotation of the arms and links. As the clamp shaft 6 rotates, the drive clamp 17, which is fixed to the clamp shaft 6 with a key or the like, rotates together with the drive clamp 17. However, the driven catch 16, which is not fixed to the clamp shaft 6, idles and does not rotate with the rotation of the clamp shaft 6.

[0020] As described above, the driven catch 16 is not fixed to the clamp shaft 6, so it rotates freely when the clamp shaft 6 rotates. However, the driven catch 16 is connected to the drive catch 7 by the catch connecting link 33 so that it rotates in the opposite direction. The tips of the drive catch 7 and the driven catch 16 simultaneously rotate toward or away from each other. In this embodiment, the connection holes 35, 37 of the catch connecting link 33, the drive catch 7, and the driven catch 16 are located below the keyed mounting hole 9 of the drive catch 7 and above the mounting hole 18 of the driven catch 16. However, the connection holes may be positioned up or down to rotate in the opposite direction. When the tips of the catches rotate toward each other, the side edge surfaces of the steel plate 2 can be clamped by the catches. In this manner, in this embodiment, a total of four catches, including the drive catch 7 and the driven catch 16, can be rotated by driving one catch motor 25.

[0021] Because the driven clamp 8 is not fixed to the catch shaft 5, it rotates freely when the catch shaft 5 rotates. However, the other end of the driven clamp 8 is connected to the drive clamp 17 by a clamp connecting link 34 so that it rotates in the opposite direction. The tips of the drive clamp 17 and the driven clamp 8 simultaneously rotate toward or away from each other. In this embodiment, the connection holes 38, 36 of the clamp connecting link 34, the drive clamp 17, and the driven clamp 8 are located below the keyed mounting hole 22 of the drive clamp 17 and above the mounting hole 13 of the driven clamp 8. However, the positions of the connection holes may be reversed to allow the drive clamp 17 to rotate in the opposite direction. When the drive clamp 17 rotates in the direction supporting the underside of the steel sheet 2, the driven clamp 8 rotates in the opposite direction to support the underside of the steel sheet 2. In this way, in the illustrated embodiment, a single clamp motor 26 can rotate a total of four clamps, including the drive clamp 17 and the driven clamp 8.

[0022] The operation of the above-described configuration will be described with reference to Figures 9 to 12. Figures 9 and 10 explain the operation of the catch portion, in which the frame body 1 is lowered toward the top of the stacked steel plates 2 with the tips of the driving catch 7 and the driven catch 16 separated. At this time, guide pieces 39 provided around the periphery of the frame body 1 come into contact with the outer periphery of the stacked steel plates 2, so the frame body 1 is guided in position and lowered to the correct position. Furthermore, if a position adjustment bolt 40 that protrudes downward is provided on the underside of the frame body 1, the distance between the uppermost steel plate 2 and the frame body 1 can be determined and the lowered position of the frame body 1 can be adjusted.

[0023] When the frame body 1 comes into contact with the top of the steel plate 2 and stops, the catch motor 25 is driven to rotate the driving catches 7 and driven catches 16, which then clamp both end surfaces of the steel plate 2 (Fig. 10). If protrusions 11 and 20 are provided on the clamping surfaces 10 and 19 of the catches 7 and 16, the protrusions will fit between the upper and lower steel plates, ensuring secure clamping. From this state, the frame body 1 is lifted by a crane. At this time, the tips of the driving clamp 17 and driven clamp 8 are separated (Fig. 11).

[0024] Then, when a space is created large enough to insert the hook portions 23, 14 of the clamps 17, 8 into the underside of the steel plate 2, the clamp motor 26 is driven to rotate the plurality of driving clamps 17 and driven clamps 8 as shown in FIG. 12, thereby supporting the underside of the steel plate 2 and allowing it to be transported without falling.

[0025] As described above, the plurality of catches 7, 16 that clamp both side surfaces of the steel plate 2 and the plurality of clamps 17, 8 that support the underside of the steel plate 2 can be driven by a catch motor 25 and a clamp motor 26, respectively, which simplifies the configuration and makes it economical to obtain. As described above, a plurality of driving catches, driven clamps, driving clamps, and driven chucks can be attached to the chuck shaft and clamp shaft, so the number of these members and their respective connecting links can be increased or decreased depending on the size, weight, etc. of the steel plate. [Explanation of symbols]

[0026] 1 Frame body 2 steel plate 5 Catch shaft 6 Clamp shaft 7 Drive catch 8 Follower clamp 16 Follower catch 17 Drive Clamp 25 Catch motor 26 Clamp motor 33 Catch connecting link 34 Clamp connecting link

Claims

1. The lifting device comprises a frame body shaped to follow the longitudinal direction of the steel plate to be lifted, a catch shaft and a clamp shaft extending along the longitudinal direction of the frame body and arranged in parallel at an interval corresponding to the width of the steel plate, a plurality of drive catches attached at least to the front and rear of the catch shaft in the longitudinal direction to clamp the side end faces of the steel plate and a plurality of driven clamps attached at least to the front and rear of the clamp shaft in the longitudinal direction to clamp the end faces of the steel plate and a plurality of drive clamps attached at least to the front and rear of the clamp shaft in the longitudinal direction to clamp the end faces of the steel plate and a plurality of drive clamps attached at least to the front and rear of the clamp shaft in the longitudinal direction to support the underside of the steel plate, a catch motor attached to the frame body to drive the catch shaft, and a clamp motor attached to the frame body to drive the clamp shaft, the drive catch being attached to the catch shaft. a driven catch attached to the clamp shaft is connected to the drive catch so as to rotate in the opposite direction following the drive catch; the drive clamp is fixed to the clamp shaft so as to rotate by the clamp motor; and the driven clamp attached to the catch shaft is connected to the drive clamp so as to rotate in the opposite direction following the drive clamp; the catch motor is driven to rotate the drive catch and driven catch to clamp both side end surfaces of the steel plate and lift it up, and then the clamp motor is driven to rotate the drive clamp and driven clamp to support the underside of the steel plate.

2. 2. The steel plate sheet lifting device according to claim 1, wherein guide pieces are provided around the frame body to guide the frame body onto the stacked steel plates when it is lowered.

3. 2. The steel plate lifting device according to claim 1, wherein a position adjustment bolt is provided on the underside of the frame body so that the frame body comes into contact with the uppermost steel plate when it is lowered.

4. 2. The steel plate lifting device according to claim 1, wherein a projection is provided on the clamping surface of the catch that contacts the side surface of the steel plate so as to enter between the uppermost steel plate and the steel plate below it.

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