Coil lifter with pressure mechanism

Abstract

To provide a coil lifter with a hold structure capable of suppressing the occurrence of a coil winding looseness, and of lifting the coil.SOLUTION: A coil lifter 1 for lifting a coil by a carrier device and holding it comprises a body part 5 lifted by the carrier device, a pair of arms 2, 2 provided on the body part 5 and extending downward from the body part 5, a pair of claw parts 3, 3, and a pressing part 4, where the pair of claw parts are provided at the lower end of each of the pair of arms 2, 2, protrudes in the direction opposed to each other, and are inserted into the inner diameter space of the coil placed between the pair of arms 2, 2 in the posture in which the opening direction of the inner diameter space of the coil is horizontal, and the pressing part is vertically movably provided on the body part 5 between the pair of arms 2, 2, and presses radially the coil placed between the pair of arms 2, 2. The pressing part 4 presses the coil when the pair of claw parts 3, 3 are inserted into the inner diameter space of the coil and the coil is supported by the pair of claw parts.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a coil lifter with a pressing mechanism. [Background technology]

[0002] Conventionally, various coil lifters have been proposed for use in lifting and transporting a coil wound with a metal sheet such as a rolled steel sheet or a non-ferrous metal sheet by a transport device such as a crane. For example, a coil lifter described in Patent Document 1 is used in a state of being lifted by a transport device, and is provided with a pair of arms arranged horizontally opposite to each other and movable horizontally. The lower ends of the pair of arms are provided with insertion claws that protrude in directions opposite to each other. When a coil is placed between the pair of arms with the opening direction of the inner diameter space of the coil (space surrounded by the inner circumferential surface) in the horizontal direction, the coil lifter holds the coil by moving the pair of arms in a direction approaching each other and inserting the insertion claws at the lower ends of each arm into the inner diameter space of the coil.

[0003] Furthermore, the coil lifter described in Patent Document 1 is provided with a support guide that presses the outer periphery of the upper end of the coil when the coil lifter holds the coil. When the coil lifter holds the coil, if the coil lifter approaches the coil from above and the lifter body holding the arm presses the outer periphery of the upper end of the coil, the weight of the coil lifter is directly transmitted to the outer periphery of the upper end of the coil, which may cause scratches or deformation on the outer periphery of the upper end of the coil. Therefore, the coil lifter described in Patent Document 1 is provided with a support guide on the lifter body, and this support guide is provided with a load damping device that damps the load transmitted from the lifter body to the outer periphery of the upper end of the coil. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-206371 A Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, when a coil made of wound thin plate is lifted by a coil lifter, if the coil loosens (hereinafter referred to as springback), problems such as scratches on the coil and poor work efficiency in the downstream production line occur. The coil lifter described in Patent Document 1 can press the outer periphery of the coil, so it can prevent springback from occurring. However, the coil lifter described in Patent Document 1 is configured to press the outer periphery of the coil only when holding the coil, and to remove the pressure when lifting, so it cannot prevent springback from occurring.

[0006] Therefore, one object of the present invention is to provide a coil lifter with a pressing mechanism that can lift a coil while suppressing the occurrence of springback. [Means for solving the problem]

[0007] In order to achieve the above object, a coil lifter with a presser mechanism according to one aspect of the present invention comprises: A coil lifter with a presser mechanism for lifting and holding a coil on which a thin sheet of iron or non-ferrous metal is wound by a conveying device, A body portion that is lifted by the transport device; A pair of arms provided on the body portion and extending downward from the body portion; a pair of claws provided at lower ends of the pair of arms, protruding in directions opposite to each other, and inserted into the inner diameter space of the coil disposed between the pair of arms with the opening direction of the inner diameter space being a space surrounded by an inner peripheral surface of the coil in a horizontal direction; a pressing portion that is provided on the body portion between the pair of arms and is movable in a vertical direction, and presses the coil disposed between the pair of arms in a radial direction of the coil; Equipped with When the pair of claw portions are inserted into the inner diameter space of the coil to support the coil, the coil is pressed by the pressing portion. Effect of the Invention

[0008] According to the present invention, the occurrence of springback can be suppressed and the coil can be lifted. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing a coil lifter. [Diagram 2] FIG. 2 is a diagram showing the internal structure of the coil lifter. [Diagram 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Diagram 5] FIG. 5 is a diagram showing the coil being lifted by the coil lifter. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, a coil lifter with a presser mechanism (hereinafter simply referred to as a coil lifter) according to an embodiment of the present invention will be described with reference to the drawings.

[0011] FIG. 1 is a diagram showing a coil lifter 1. FIG. 2 is a diagram showing the internal structure of the coil lifter 1. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2. Note that arms 2, 2 shown in FIG. 1 are omitted in FIGS. 2 to 4. For convenience of illustration, drive shaft portion 41 shown in FIG. 3 is not shown in cross section. FIG. 5 is a diagram showing a state in which coil 100 is lifted by coil lifter 1.

[0012] The coil lifter 1 is a device for holding and lifting a coil 100 around which a rolled thin metal sheet or a non-ferrous metal sheet is wound while being hoisted by a transport device such as a crane (hereinafter referred to as a crane). The coil lifter 1 is also a device for suppressing the occurrence of springback in the coil 100 when the coil 100 is hoisted by pressing the outer periphery of the coil 100. The configuration of the coil lifter 1 while being hoisted by a crane will be described below.

[0013] When the coil 100 is not restrained by a restraining device such as a cable tie and no external force is applied to it, the coil 100 naturally unwinds.

[0014] The coil lifter 1 includes a pair of arms 2, 2, a pair of claw portions 3, 3, a pressing portion 4, and a body portion 5.

[0015] The body 5 is a lifter main body that is lifted by a crane. The body 5 has a first body 51 that is held by the crane and a second body 52 that holds a pair of arms 2, 2. The first body 51 is provided with a hook 51A for hooking a hook of the crane. The second body 52 is provided with a pair of arms 2, 2 that extend downward.

[0016] The first body 51 has a configuration in which the above-mentioned hook portion 51A is formed at the upper end to close the space inside the first body 51, and extends downward in a cylindrical shape from this upper end. The overall vertical length of the first body 51 is shorter than the overall vertical length of the second body 52. ​​The first body 51 forms a space to accommodate the upper ends of the drive shaft 41 and the guide shaft 42, which will be described later. The lower end 511 of the first body 51 is connected to the upper end 521 of the second body 52.

[0017] The first body 51 and the second body 52 are separate members, and the second body 52 is rotatable relative to the first body 51 around a central axis along the vertical direction (up-down direction). That is, the pair of arms 2, 2 supported by the second body 52 are rotatable around a central axis relative to the hook of the crane. This makes it easier to align the arms 2, 2 when holding the coil. Specifically, the first body 51 and the second body 52 are connected via a bearing 61, and rotate relative to each other by meshing of the first external gear 62 and the second external gear 64 (see FIG. 3). The bearing 61 is, for example, an angular ball bearing, and allows the second body 52 to rotate relative to the first body 51 while receiving a vertical load acting on the first body 51 from the second body 52. ​​The outer ring of the bearing 61 is fixed to the lower end 511 of the first body 51. The inner ring of the bearing portion 61 is fixed to the upper end portion 521 of the second body portion 52, and rotates together with the second body portion 52 around the central axis. The drive shaft portion 41 and the guide shaft portion 42 can pass through a space surrounded by the inner peripheral surface of the inner ring of the bearing portion 61. The first external gear 62 is located on the outer peripheral side of the bearing portion 61 and is fixed to the first body portion 51. The second body portion 52 is provided with a rotary motor (rotary drive portion) 63 that rotates the second body portion 52. The casing of the rotary motor 63 is fixed to a bracket 53 formed on the upper portion of the second body portion 52, and the rotary motor 63 and the second body portion 52 rotate together around the central axis. The rotary motor 63 is provided on a rotary shaft thereof with a second external gear 64 that is adapted to mesh with the first external gear 62. In this configuration, when the second external gear 64 rotates, the second external gear 64 and the first external gear 62 mesh and rotate, causing the rotary motor 63 to move along the circumferential direction of the first external gear 62, and therefore the second body 52 also moves in the circumferential direction. In this way, the second body 52 is rotatable relative to the first body 51 around a central axis along the vertical direction.

[0018] The second body portion 52 has a cylindrical portion 54 extending downward from the first body portion 51, and a lower body portion 55 disposed at the lower end of the cylindrical portion 54. The upper end portion of the cylindrical portion 54 is the upper end portion 521 of the second body portion 52.

[0019] Additionally, the first body portion 51 and the cylindrical portion 54 of the second body portion 52 form a cavity 5A. The cavity 5A is columnar, and the pressing portion 4 described below is accommodated therein.

[0020] The pair of arms 2, 2 extend downward from the second body section 52. The pair of arms 2, 2 are arranged horizontally opposite to each other, and are provided on the second body section 52 so as to be horizontally movable toward or away from each other. The pair of arms 2, 2 may be configured to move by a rack and pinion mechanism using an electric motor as a drive source, for example, or may be configured to move by a hydraulic cylinder. Furthermore, the pair of arms 2, 2 may be configured to move synchronously with each other, or one and the other may move separately. The drive source for driving the pair of arms 2, 2 is housed, for example, in the lower body section 55.

[0021] The pair of claws 3, 3 are rotatably provided at the lower end of each of the pair of arms 2, 2, as shown by the arrow in Fig. 1. The pair of claws 3, 3 are rotatably provided between a substantially vertically erected position and a substantially horizontally tilted position, using an electric motor or a hydraulic actuator as a drive source. When in the horizontally tilted position, the pair of claws 3, 3 protrude in directions opposite to each other, and when in the vertically erected position, they are stored in the pair of arms 2, 2. When the coil lifter 1 holds the coil, the pair of claws 3, 3 are inserted into the inner diameter space of the coil.

[0022] The pressing unit 4 is a member for pressing the coil 100 located between the pair of arms 2, 2 in the radial direction of the coil 100. The pressing unit 4 is provided on the body unit 5 between the pair of arms 2, 2 and movable along the vertical direction. The pressing unit 4 extends in the vertical direction and has shafts of a drive shaft unit 41 and a pair of guide shaft units 42 provided on the body unit 5 and movable along the vertical direction, and a pressing main body unit 43 provided at the lower ends of these shafts and pressing the coil.

[0023] As described above, the drive shaft 41 is disposed inside the cavity 5A of the body 5. The drive shaft 41 moves vertically by hydraulic pressure. More specifically, the drive shaft 41 is a hydraulic cylinder, and has a body 41A to which hydraulic oil is supplied from the hydraulic control unit 45, and a piston rod 41B to which the amount of downward projection from the body 41A changes as hydraulic oil is supplied from the hydraulic control unit 45 to the body 41A. A pressing body 43 is provided at the lower end of the piston rod 41B. The body 41A is disposed in the cavity 5A of the body 5. The upper end of the body 41A is disposed in the first body 51. The lower end of the body 41A is disposed in the cylindrical portion 54 of the second body 52, and is surrounded by the lower body portion 55. With this configuration, the length of the body 41A can be increased, and the vertical movement of the piston rod 41B can be increased. At least the lower end of the piston rod 41B is adapted to move between inside and outside the cavity 5A, so that the pressing body 43 provided at the lower end of the piston rod 41B is adapted to move between inside and outside the cavity 5A.

[0024] Pressing body 43 is provided at the lower end of piston rod 41B of drive shaft 41, and moves vertically as piston rod 41B moves vertically. Pressing body 43 is a member that comes into contact with coil 100 and presses coil 100. The portion of pressing body 43 that comes into contact with coil 100 is preferably made of heat-resistant resin, such as resin (MC nylon, etc.) or aluminum / brass rubber (urethane rubber, fluororubber, etc.). In this case, even if coil 100 is formed from a rolled thin metal plate and is at a high temperature after rolling, pressing body 43 can press coil 100, and deformation of the plate due to pressing scratches or pressing force can be reduced.

[0025] The pair of guide shafts 42 are arranged horizontally facing each other so that the drive shaft 41 is arranged between them. The pressing body 43 is provided at the lower end of the pair of guide shafts 42. As described above, the pressing body 43 moves vertically as the piston rod 41B of the drive shaft 41 moves. The pair of guide shafts 42 move vertically as the pressing body 43 provided at the lower end moves. In other words, the pair of guide shafts 42 do not have their own driving source, but receive the driving force of the drive shaft 41 via the pressing body 43 and move vertically. Therefore, no space is required to install the driving source of the pair of guide shafts 42, and the size of the device can be suppressed.

[0026] The pair of guide shafts 42 are members for guiding the pressing body 43, which is moved in the vertical direction by the drive shaft 41, so that it does not tilt with respect to the horizontal direction. As shown in FIG. 2, the lower end of the drive shaft 41 is connected to the approximate center of the pressing body 43. Therefore, when the pressing body 43 is moved in the vertical direction by the drive shaft 41, if there are no pair of guide shafts 42, the pressing body 43 may tilt in the horizontal direction with the connection point with the drive shaft 41 as a fulcrum. Therefore, by arranging the pair of guide shafts 42 in the horizontal direction so as to face each other and place the drive shaft 41 between them, it is possible to prevent the pressing body 43 from tilting. The pair of guide shafts 42 are supported in a pair of guide holes formed in the lower body 55 via cylindrical bushes (not shown) so as to be slidable up and down. This suppresses the pair of guide shafts 42 and the drive shaft 41 from tilting with respect to the vertical direction.

[0027] The hydraulic control unit 45 that supplies hydraulic oil to the drive shaft portion 41 can control the supply of hydraulic oil so that the pressure of the hydraulic oil supplied to the drive shaft portion 41 can be changed between low pressure and high pressure, which is higher than the low pressure. This allows the pressure with which the pressing unit 4 presses the coil 100 to be adjusted. For example, by pressing the coil 100 with a weak pressure when the pressing main body portion 43 contacts the coil 100 and pressing the coil 100 with a strong pressure when lifting the coil 100 after contact, it is possible to prevent deformation of the coil 100 when contact is made with low pressure and to prevent springback when contact is made with high pressure.

[0028] The hydraulic control unit 45 and the rotary motor 63 that rotates the second body 52 are disposed outside the cavity 5A. By providing the hydraulic control unit 45 and the rotary motor 63 outside the cavity 5A, it is possible to prevent the body 5 from becoming large. The hydraulic control unit 45 is fixed, for example, to the upper part of the lower body 55. Furthermore, the rotary motor 63 is disposed at a location separated from the hydraulic control unit 45 in a plan view. With this configuration, it is not necessary to dispose the rotary motor 63 and the hydraulic control unit 45 with a gap between them, and it is possible to avoid increasing the horizontal dimension of the second body 52.

[0029] Next, a method for lifting a coil using the coil lifter 1 having the above configuration will be described.

[0030] As shown in FIG. 5, the coil 100 has an inner diameter space 100A as a space surrounded by the inner circumferential surface of the coil 100. The coil 100, which is waiting to be lifted by the coil lifter 1, is arranged in a position in which the opening direction of the inner diameter space 100A is horizontal. When the coil lifter 1 is lifted by a crane, the coil 100 is moved so that the coil 100 is positioned between the pair of arms 2, 2 with the distance between the pair of arms 2, 2 being wider than the width of the coil 100. When the coil lifter 1 is moved so that the coil 100 is positioned between the pair of arms 2, 2, the pair of claws 3, 3 are rotated from a vertically standing position to a horizontally lying position. In this state, the pair of arms 2, 2 are moved in a direction approaching each other, and the pair of claws 3, 3 are inserted into the inner diameter space 100A of the coil 100.

[0031] Moreover, hydraulic oil is supplied to one port of the body 41A of the drive shaft 41 to extend the piston rod 41B, move the pressing body 43 downward, and press the coil 100 with the pressing body 43. At this time, the pressure of the hydraulic oil supplied to the body 41A of the drive shaft 41 is adjusted so that the coil 100 is pressed with weak pressure when the pressing body 43 contacts the coil, and is pressed with strong pressure when the coil 100 is lifted after contact. This reduces deformation of the coil at the time of contact. The pressure of the hydraulic oil is adjusted by an operator using, for example, a controller (not shown). Furthermore, by using a hydraulic mechanism and control, it is possible to prevent damage to the coil 100 by adjusting the hydraulic pressure and maintain pressing with an appropriate pressing force that does not cause springback.

[0032] In this manner, by lifting the coil 100 while pressing the outer periphery of the coil 100 with the pressing unit 4, it is possible to prevent springback from occurring in the coil 100. Furthermore, the coil 100 can be transported to the subsequent processing without slack. [Explanation of symbols]

[0033] 1: Coil lifter 2: Arm 3: Claw part 4: Pressing part 5: Body 5A: Cavity 41: Drive shaft 41A: Main unit 41B: Piston rod 42: Guide shaft part 43: Pressing body 45: Hydraulic control unit 51: 1st body part 51A: Hook part 52:Second body part 61: Bearing part 62: First external gear 63: Rotary motor 64: 2nd external gear 100: Coil 100A: Inner diameter space

Claims

1. A coil lifter with a press mechanism for lifting and holding a coil on which a thin sheet of iron or non-ferrous metal is wound by a transport device, A body portion that is lifted by the conveying device; A pair of arms provided on the body portion and extending downward from the body portion; a pair of claws provided at lower ends of the pair of arms, protruding in directions opposite to each other, and inserted into the inner diameter space of the coil disposed between the pair of arms with the opening direction of the inner diameter space being a space surrounded by an inner peripheral surface of the coil in a horizontal direction; a pressing portion that is provided on the body portion between the pair of arms and is movable in a vertical direction, and presses the coil disposed between the pair of arms in a radial direction of the coil; Equipped with When the pair of claw portions are inserted into the inner diameter space of the coil and the coil is supported by the pair of claw portions, while the coil is being pressed by the pressing portion, the pair of claw portions and the pressing portion are in frictional contact with the coil, and the coil is constantly prevented from rotating in the circumferential direction of the coil relative to the pair of claw portions and the pressing portion. Coil lifter with pressure mechanism.

2. The pressing portion is a shaft portion extending in the vertical direction and provided on the body portion so as to be movable along the vertical direction; a pressing body portion provided at a lower end of the shaft portion and pressing the coil; having a portion of the pressing body that comes into contact with the coil is made of a heat-resistant resin; The shaft portion is A drive shaft portion that moves along the vertical direction by hydraulic pressure; a pair of guide shafts arranged to face each other in a horizontal direction with the drive shaft portion disposed therebetween, and which move in the up-down direction as the pressing body portion moves with the movement of the drive shaft portion; 2. The coil lifter with a pressing mechanism according to claim 1, further comprising:

3. The body portion has a cavity, a portion of the shaft portion disposed within the cavity of the body portion; a hydraulic control unit disposed outside the cavity of the body portion and supplying hydraulic oil to the drive shaft portion; The hydraulic control unit is The supply of the hydraulic oil is controllable so that the pressure of the hydraulic oil can be changed between a low pressure and a high pressure having a pressure value higher than the low pressure.

3. The coil lifter with a pressing mechanism according to claim 2.

4. The body portion is A first body portion held by the conveying device; A second body portion that holds the pair of arms and is rotatable relative to the first body portion around a central axis along the vertical direction; having a rotation drive unit disposed outside the cavity of the body portion and configured to rotate the second body portion around the central axis; Further comprising:

4. The coil lifter with a pressing mechanism according to claim 3.

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