JP2000309486A - Lifter for coil transfer - Google Patents

Abstract

(57) [Problem] To provide a coil transport lifter capable of preventing a coil end portion from being damaged when a coil is lifted. SOLUTION: Lifter body 2 movably suspended.
The gripping claws 4 provided on the inner surfaces of the lower ends of a pair of right and left arms 3 which are vertically attached to and detachable from each other are inserted into the inner diameter space of the coil interposed between the arms 3 to engage and support the coil. In the coil transfer lifter shown in FIG.
A detector 5 for detecting that the arm 3 has approached the coil end face and stopping the approach operation of the arms 3 and 3 and an elastic cushioning material 6 for preventing the coil end face from directly contacting the inner face of the arm 3 are attached. .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil transport lifter capable of preventing a coil from being damaged when the coil is lifted.

[0002]

2. Description of the Related Art Conventionally, centralized yards have been promoted in a coil storage area such as a plating factory in an iron making factory, and handling of loads such as coil transport is performed by using a coil transport lifter suspended from an overhead crane. Have been done. As this coil transport lifter, there is a coil in which a gripping claw provided on a lower inner surface of a pair of right and left freely movable arms vertically suspended from a lifter body movably suspended by an overhead crane is interposed between both arms. In general, a portal type is used which is inserted into the inner diameter space portion to engage and support the coil.

However, in the conventional coil transport lifter, there is a problem that the arm directly contacts the coil end surface and scratches the end surface. In order to avoid this, a touch panel or a detector such as an optical sensor has been incorporated to improve the arm so that it is stopped just before the coil end surface.However, it is difficult to stop at an accurate position, In addition, there is a problem in that if there is a large edge protrusion on the coil end surface, a lifting error may occur.
Further, when the overhead crane is displaced from the center of the coil, the lifter is inclined when the coil is lifted, so that the arm comes into contact with the coil end face and the coil end face is damaged.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and prevents the arm from coming into direct contact with the coil end face when lifting the coil, thereby preventing the coil from being flawed. The present invention has been completed for the purpose of providing a coil transport lifter capable of reliably preventing the lift.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is provided on the inner surfaces of the lower ends of a pair of left and right arms which are vertically attached to a lifter body movably suspended and which can be freely moved. In the coil transport lifter that inserts the gripping claw into the inner diameter space of the coil interposed between both arms to engage and support the coil, the inside of each arm confirms that the arm approaches the coil end face. A coil transport lifter comprising a detector for detecting and stopping an approach operation of the arm and an elastic cushioning material for preventing an end face of the coil from directly contacting the inner surface of the arm. This is the invention of the first aspect. In addition, the elastic cushioning material of such a coil transfer lifter is a leaf spring having an arc-shaped cross section, one end of which is attached to the inner surface of the arm, and the other end slides on the inner surface of the arm due to expansion and contraction of the leaf spring to exhibit elasticity. Preferably, this is the invention of claim 2, and in each of the above-mentioned inventions, the detector is attached to the inner surface side of the arm, and a plurality of elastic cushioning members are provided on the inner surface of the arm. According to a third aspect of the present invention, the detector according to each of the above-described aspects of the invention is formed in a disk shape and the panel surface thereof always projects inward from the elastic cushioning material.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. The drawings show a case where the invention is applied to a coil transport lifter for a coil storage in a plating factory. In the drawing, 1 is an overhead crane, 2 is a lifter body suspended from the overhead crane 1 via a wire 1a, Reference numeral 3 denotes a pair of left and right arms which are vertically attached to both sides of the lifter main body 2 and which can be freely contacted and separated by a motor. Reference numeral 4 denotes a coil lifting claw projecting inward from a lower end inside the arm 3. This gate-shaped lifter allows the coil 20
Is lifted and transported to an arbitrary position by moving the overhead crane 1 is basically the same as the conventional coil transport lifter. In the drawing, 2a is the arm 3,
3 is a drive source for performing parallel movement so as to match the width of the coil.

In the present invention, both arms 3 and 3 of the above-described coil transport lifter are operated to approach one side of each of the arms 3 so that the lower gripping claws 4 are inserted into the inner diameter space 21 of the coil 20. A detector 5 for detecting that the coil end face has approached the required amount by a necessary amount and transmitting a signal to the motor to stop the approach operation of the arms 3 and 3 is provided, and a metallic metal for preventing the coil end face from directly contacting the inner surface of the arm. It has a characteristic configuration in that a plurality of elastic cushioning members 6 are provided. With this configuration, the coil 20 is reliably lifted by the gripping claws 4, and when the coil 20 is lifted, the arm 3 is prevented from coming into direct contact with the coil end face, thereby preventing the coil from being scratched. You do it.

The detector 5 detects that the gripping claw 4 has been securely inserted into the inner diameter space 21 of the coil 20, and
At this position, the movement of the arm 3 is stopped to prevent the coil end face from hitting the arm 3, and the detector 5 shown in the figure is of a link type, and the sensing bar at the tip is attached to the coil end face. When touched and pressed, a switch (not shown) is activated to stop the advance of the arm 3. However, the switch may be activated by an optical sensor or the like instead of the link type sensing bar. .

The elastic cushioning member 6 prevents the coil end face from directly contacting the arm 3 and also prevents the coil end face from being flawed by absorbing an impact force by an elastic action. Therefore, the elastic cushioning member 6 does not wear even when the coil end face hits and needs to be elastically deformed in accordance with the collision of the coil end face. One end of the leaf spring is attached to the inner surface of the arm, and the other end that is in a free state due to the expansion and contraction of the leaf spring slides on the inner surface of the arm to exhibit elasticity. It is preferable because the ends exhibit elasticity and extend to provide a buffering action, so that the coil can be prevented from being damaged. If a plurality of the elastic cushioning members 6 are arranged above and below the arm 3 except for the side where the detector 5 is attached, a coil of any size can be used.

It is preferable that the detector 5 is formed in a disk shape and its surface is always protruded inward from the elastic cushioning member 6. As shown in FIG. when the amount L ₁ is 250 mm, the detector senses a bar protrusion amount L ₂ of the 5 larger degree both about 100mm than conventional projection amount as 120 mm, to prevent the coil end face is in direct contact with the arm 3 as much as possible are doing.

In the apparatus constructed as described above, the overhead crane 1 is moved to a position directly above a coil to be transported, the coil 20 is lifted by the portal type lifter, and the overhead crane 1 is transported to an arbitrary position. This is basically the same as the conventional coil transport lifter. However, inside each arm 3 according to the present invention, the gripping claws 4 at the lower end of the arm 3 are provided in the inner space 21 of the coil 20. Not only is a detector 5 provided to detect that the interval between the arms 3 is reduced to the insertion position, but also an elastic cushioning material 6 for preventing the coil end face from directly contacting the arm 3 is provided. Since the coil 20 is provided, the coil 20 can be reliably lifted by the gripping claws 4, and the arm 3 is prevented from directly contacting the coil end surface when the coil 20 is lifted, and the coil has a flaw. It becomes to be able to reliably prevent the stick.

The overhead crane 1 may not always be located directly above the coil. In this case, as shown in FIG. 4, the lifter is lifted obliquely upward, and as a result, the lifter is inclined. Although the arm 3 and the coil end face come into contact with each other and cause a flaw, in the present invention, even if the lifter is pulled up obliquely upward, the coil end face is attached to the arm 3 because the elastic cushioning material 6 is attached inside the arm 3. As a result, the coil end face does not flaw due to the cushioning action of the elastic cushioning material 6. Further, the coil may have a protrusion called an edge protrusion, which has conventionally been crushed by the arm 3 to cause a flaw. This can also be prevented by the buffering action of. According to the actual operation test, the number of scratches generated when the lifter of the present invention was used was 6 times or less in one month, compared with the conventional number of scratches generated 200 times or more in one month. It was confirmed that a significant improvement was achieved. In the above description, a steel plate coil is used as an object to be conveyed, but it goes without saying that the present invention can be used for conveying a soft metal coil such as an aluminum coil or a copper coil.

[0013]

As is apparent from the above description, the present invention can prevent the arm from directly contacting the coil end face when lifting the coil, and can reliably prevent the coil end face from being flawed. You can do it. In addition, since it is only necessary to attach the elastic cushioning material, it is economical without having to make a large capital investment. Therefore, the present invention greatly contributes to industrial development as a coil transport lifter that has eliminated the conventional problems.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing an arm.

FIG. 3 is an enlarged view of a main part.

FIG. 4 is a schematic front view showing a state in which a coil is pulled up.

[Explanation of symbols]

 2 Lifter body 3 Arm 4 Gripping claw 5 Detector 6 Elastic cushioning material 20 Coil 21 Hole

Claims (4)

[Claims] 1. A pair of left and right arms vertically suspended from a lifter body movably suspended, and gripping claws provided on inner surfaces at lower ends of a pair of left and right arms are inserted into an inner diameter space of a coil interposed between the arms. A coil transfer lifter that engages and supports the coil by detecting the approach of the arm to the coil end face inside the arm and stopping the approach operation of the arm; and the coil end face to the inner face of the arm. A lifter for transferring a coil, wherein an elastic cushioning material for preventing direct contact with the coil is attached. 2. The elastic cushioning material is a leaf spring having an arc-shaped cross section.
The lifter for coil transfer according to claim 1, wherein one end of the lifter is attached to an inner surface of the arm, and the other end slides on the inner surface of the arm to exhibit elasticity by expansion and contraction of a leaf spring. 3. A detector is mounted on an inner side of the arm.
The lifter for coil transfer according to claim 1 or 2, wherein a plurality of elastic cushioning members are provided on the inner surface of the arm. 4. The coil transport lifter according to claim 1, wherein the detector has a disk shape, and the disk surface always projects inward from the elastic cushioning material.