JP7657616B2 - Coil lifter with pressure mechanism - Google Patents

Description

The present invention relates to a coil lifter with a pressing mechanism.

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

The coil lifter described in Patent Document 1 also has 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, as 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 can cause scratches or deformation on the outer periphery of the upper end of the coil. Therefore, the coil lifter described in Patent Document 1 has a support guide on the lifter body, and this support guide is equipped with a load damping device that dampens the load transmitted from the lifter body to the outer periphery of the upper end of the coil.

JP 2017-206371 A

However, when a coil made of wound thin plate is lifted by a coil lifter, if the coil loosens (hereafter referred to as springback), problems such as scratches on the coil and reduced work efficiency in the downstream production line occur. The coil lifter described in Patent Document 1 can press down on the outer periphery of the coil, and is therefore able to prevent springback from occurring. However, the coil lifter described in Patent Document 1 is configured to press down on the outer periphery of the coil only when holding the coil, and is no longer pressing down when lifting, and therefore cannot prevent springback from occurring.

Therefore, one of the objects of the present invention is to provide a coil lifter with a pressure mechanism that can lift coils while suppressing the occurrence of springback.

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 the up-down 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.

According to the present invention, it is possible to lift the coil while suppressing the occurrence of springback.

FIG. 1 is a diagram showing a coil lifter. FIG. 2 is a diagram showing the internal structure of the coil lifter. FIG. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a diagram showing a state in which the coil is lifted by the coil lifter.

The coil lifter with a pressing mechanism (hereinafter simply referred to as a coil lifter) according to an embodiment of the present invention will be described below with reference to the drawings.

Figure 1 is a diagram showing the coil lifter 1. Figure 2 is a diagram showing the internal structure of the coil lifter 1. Figure 3 is a cross-sectional view taken along line III-III in Figure 2. Figure 4 is a cross-sectional view taken along line IV-IV in Figure 2. Note that the arms 2, 2 shown in Figure 1 are omitted in Figures 2 to 4. Also, for convenience of the drawings, the drive shaft portion 41 shown in Figure 3 is not shown in cross section. Figure 5 is a diagram showing the state in which the coil 100 is lifted by the coil lifter 1.

The coil lifter 1 is a device for holding and lifting a coil 100 around which rolled thin metal sheets or thin non-ferrous metal sheets are wound while being hoisted by a transport device such as a crane (hereinafter referred to as the crane). The coil lifter 1 also presses the outer periphery of the coil 100 to suppress the occurrence of springback in the coil 100 when the coil 100 is lifted. The configuration of the coil lifter 1 when it is hoisted by a crane is described below.

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

The coil lifter 1 has a pair of arms 2, 2, a pair of claws 3, 3, a pressing portion 4, and a body portion 5.

The body 5 is the 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 the hook of the crane. The second body 52 is provided with a pair of arms 2, 2 that extend downward.

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 portion 41 and the guide shaft portion 42, which will be described later. The lower end portion 511 of the first body 51 is connected to the upper end portion 521 of the second body 52.

The first body 51 and the second body 52 are separate members, and the second body 52 can rotate relative to the first body 51 around a central axis along the vertical direction (up and down direction). In other words, the pair of arms 2, 2 supported by the second body 52 can rotate 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 due to the 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 the 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, which 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 in 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 can rotate relative to the first body 51 around a central axis along the vertical direction.

The second body section 52 has a cylindrical section 54 extending downward from the first body section 51, and a lower body section 55 located at the lower end of the cylindrical section 54. The upper end section of the cylindrical section 54 is the upper end section 521 of the second body section 52.

The first body 51 and the cylindrical portion 54 of the second body 52 form a cavity 5A. The cavity 5A is columnar, and the pressing portion 4 described below is housed inside.

The pair of arms 2, 2 extend downward from the second body section 52. The pair of arms 2, 2 are arranged horizontally opposite each other and are provided on the second body section 52 so as to be movable horizontally so as to move close to or apart 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 that drives the pair of arms 2, 2 is housed, for example, in the lower body section 55.

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 arrows 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 hydraulic actuator as a drive source. When the pair of claws 3, 3 are in a horizontally tilted position, they protrude in directions opposite each other, and when they are in a 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.

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 has shafts of a drive shaft unit 41 and a pair of guide shaft units 42 that extend vertically and are provided on the body unit 5 and movable along the vertical direction, and a pressing body unit 43 that is provided at the lower ends of these shafts and presses the coil.

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. In detail, 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 protrusion 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 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. This allows the pressing body 43 provided at the lower end of the piston rod 41B to move between inside and outside the cavity 5A.

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

The pair of guide shafts 42 are arranged horizontally facing each other with the drive shaft 41 disposed 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 their lower ends moves. In other words, the pair of guide shafts 42 do not have their own driving source, but move vertically by receiving the driving force of the drive shaft 41 via the pressing body 43. 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.

The pair of guide shafts 42 are members for guiding the pressing body 43, which is moved vertically 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, if the pair of guide shafts 42 are not present, when the pressing body 43 is moved vertically by the drive shaft 41, the pressing body 43 may tilt horizontally with the connection point with the drive shaft 41 as a fulcrum. Therefore, by arranging the pair of guide shafts 42 horizontally opposite each other so that the drive shaft 41 is arranged between them, it is possible to prevent the pressing body 43 from tilting. The pair of guide shafts 42 are supported by 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.

The hydraulic control unit 45 that supplies hydraulic oil to the drive shaft 41 can control the supply of hydraulic oil so that the pressure of the hydraulic oil supplied to the drive shaft 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 with a weak pressure when the pressing body 43 contacts the coil 100 and pressing 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.

The hydraulic control unit 45 and the rotary motor 63 that rotates the second body 52 are disposed outside the cavity 5A. By disposing the hydraulic control unit 45 and the rotary motor 63 outside the cavity 5A, the size of the body 5 can be prevented from increasing. The hydraulic control unit 45 is fixed, for example, to the upper part of the lower body 55. The rotary motor 63 is installed at a location separated from the hydraulic control unit 45 in a plan view. With this configuration, there is no need to dispose the rotary motor 63 and the hydraulic control unit 45 with a gap between them, and the horizontal dimension of the second body 52 does not need to be increased.

Next, we will explain how to lift a coil using the coil lifter 1 configured as above.

As shown in FIG. 5, the coil 100 has an inner diameter space 100A surrounded by the inner peripheral surface of the coil 100. The coil 100, which is waiting to be lifted by the coil lifter 1, is positioned with the opening direction of the inner diameter space 100A horizontal. When the coil lifter 1 is lifted by a crane, it 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 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 to insert the pair of claws 3, 3 into the inner diameter space 100A of the coil 100.

Hydraulic oil is supplied to one port of the body 41A of the drive shaft 41, the piston rod 41B is extended, the pressing body 43 is moved downward, and the pressing body 43 presses the coil 100. 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 the operator using, for example, a controller (not shown). In addition, by using a hydraulic mechanism and control, it is possible to maintain pressing with an appropriate pressing force that prevents damage to the coil 100 and does not cause springback by adjusting the hydraulic pressure.

In this way, 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. In addition, the coil 100 can be transported without slack for subsequent processing.

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

Claims (4)

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 the up-down 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. 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: 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. 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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