JPH11130371A - Tong for coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tong for coil, wherein it is not necessary to cut a coil by an end stop, yield is high, a steel pipe or the like is prevented from being crushed by gripping the coil with a low pressure and the coil is prevented from falling. SOLUTION: A coil tong for transporting a coil by gripping it comprises a support arm 1 and a pair of L-shaped movable arms 2 provided in the support arm 1 to approach/moved away from each other. In pad bases 6 provided in the tips of the respective movable arms 2, rows of pluralities of cylinders 8a are respectively provided on the opposing surfaces thereof. A pad 9 is provided in the tip of the piston 8b of each cylinder, and by causing the movable arms 2 to approach each other by gripping a coil 10 while adjusting the moving distance of the piston 8b of each cylinder 8a, the coil 10 is gripped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an LWC (Level Woun).
d Coil: For coil tongs used to transport coils such as copper tube horizontal winding coils, etc., in particular, a plurality of pads that directly contact the coil are provided in the coil axis direction, and the relative distance of each pad to the coil can be adjusted arbitrarily. It relates to possible coil tongs.

[0002]

2. Description of the Related Art Conventionally, LWC tongs have a single pad. FIG. 3 shows a conventional LWC tong.
In the conventional LWC tong shown in FIG. 3, a horizontal support arm 1 is fixed to an appropriate moving member, and L-shaped arms 2 are installed at both ends in the longitudinal direction of the support arm 1 so as to face each other. Have been. This arm 2 is movable relative to the support arm 1 and
Can be moved toward and away from each other by means of a guide (not shown) provided at the front end. Each arm 2 is connected to a cylinder 5 via a connecting rod 4, and the operation of the cylinder 5 drives the arm 2. Vertical pads 3 are fixed to the ends of the pair of L-shaped arms 2 so as to face each other. The pad 3 is slightly curved in plan view along the outer peripheral surface of the coil 10.

In the conventional tongue constructed as described above, the pad 3 is positioned so as to sandwich the coil 10 and then the cylinder 5 is operated to move the arms 2 closer to each other. 10, and the coil 10 is sandwiched between the pads 3. In this state, if the tongue is moved via the moving member supporting the support arm 1, the coil 10 can be moved to a desired position.

[0004]

However, when the diameter of the wire portion constituting the coil is large, as in the case of a copper tube coil, the end of the coil wire, that is, the end of the coil winding, is located in the longitudinal direction of the coil. 3, the diameter of the coil greatly changes in the longitudinal direction of the coil, as shown in FIG.

[0005] Then, as shown in FIG.
Is in contact with only a part of the coil 10, for example, only in the upper half, and the pad 3 is not in contact with the coil 10 in the lower half. For this reason, the pad 3 contacts and supports the coil load only in a part of the outer peripheral surface thereof. When the coil 10 is sandwiched by a load necessary to support the coil load, the outer peripheral surface of the coil 10 There is a problem that a large pressure is applied to the copper tube and the copper tube is crushed. In particular, in the case of a copper pipe with an external groove, there is a problem that the groove is easily deformed by the gripping force received from the tongue. On the other hand, when trying to clamp the coil 10 with a small load so that the copper tube itself is not crushed or the groove is not deformed, the force for supporting the coil 10 may be insufficient and the coil 10 may drop. is there.

Therefore, conventionally, in order to solve these drawbacks, the copper tube is cut at the upper end or the lower end of the coil so that the pad 3 comes into contact with the entire outer peripheral surface of the coil 10, so-called an end stop. The outer peripheral surface of the coil has no step.

[0007] However, when the coil is cut with the ends stopped in this way, there is a problem that the copper pipe is longer than the dimension determined by the predetermined coil single weight per coil, and the yield is poor.

The present invention has been made in view of such a problem, and it is not necessary to cut a coil by an end stop, and the yield is high, and a coil such as a copper tube is crushed by holding the coil at a low pressure. It is an object of the present invention to provide a coil tongue which can prevent the coil from dropping.

[0009]

According to the present invention, there is provided a coil tongue for a coil tongue which is transported with a coil interposed therebetween. The coil tongue includes a base and a pair of movable parts which are movably mounted on the base and move close to and away from each other. And a plurality of cylinders provided in a row on the opposing surface of each movable portion, and a pad provided at the tip of the piston of each cylinder, while adjusting the advance distance of the piston of the cylinder. The movable parts approach each other with a coil between them,
The coil is gripped.

[0010] In the present invention, the longitudinal direction of the coil,
The coil and the tongue are relatively arranged so that the arrangement direction of the plurality of cylinders coincides with each other, and the advance lengths of the pistons of the plurality of cylinders are adjusted according to the step on the outer peripheral surface of the coil. Then, in this state, the movable parts are moved closer to each other, and the coil is clamped through a pad provided at the tip of the piston of the cylinder. Then, the extension length of the piston of the cylinder is adjusted according to the step of the outer peripheral surface of the coil, so that the extension length of the piston is short at the portion where the coil outer diameter is large, and the extension length of the piston at the portion where the coil outer diameter is small. Therefore, all of the pads provided at the tip of the piston are in contact with the outer peripheral surface of the coil. Therefore, when the coil is clamped by the tongue, the pressure applied to the coil from the tongue acts on the total contact area of the plurality of pads, which is equivalent to a case where there is no step on the outer peripheral surface of the coil. Accordingly, the clamping pressure becomes extremely small, and even if the clamping load is increased to such an extent that the coil can be prevented from falling, the copper tube or the like can be prevented from being crushed.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the accompanying drawings. FIG. 1 shows a coil tong according to an embodiment of the present invention. This embodiment is different from the conventional embodiment in that a conventional single pad is divided into a plurality of divided pads. 1, components having the same functions as those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 1, in this embodiment,
Pad bases 6 are fixed to the ends of a pair of L-shaped arms 2 as movable portions, respectively, with their longitudinal directions being vertical.
A plurality of cylinders 8a are arranged in a row on the opposing surfaces of the pair of pad bases 6 in the vertical direction. The pistons 8b of each cylinder 8a can advance and retreat in a horizontal direction, that is, in directions facing each other, and pads 9 are provided at the tips of the pistons 8b, respectively. Accordingly, the plurality of pads 9 advance and retreat toward the coil 10 when the piston 8b of the cylinder 8a advances and retreats, and the interval between the opposing pads can be arbitrarily adjusted. Cylinder 8
The driving of the piston 8b a to advance and retreat is performed simultaneously for all the cylinders by the electromagnetic valves 7 provided in the arm 2. That is, by opening the solenoid valve 7, the pressure medium is supplied to all the cylinders 8a, all the pistons 8b advance simultaneously, and conversely, by closing the solenoid valve 7, all the pistons 8b are retracted. I do. Each piston 8b is controlled to stop at that position when the pad 9 at the tip thereof comes into contact with the coil 10 and receives a reaction force. The cylinder 5 is also driven by a solenoid valve (not shown),
When the solenoid valve is opened, the piston 4 is retracted, and the arm 2 grips the coil 10.

Next, the operation of the coil tongs configured as described above will be described. First, in a state where the piston 4 of the cylinder 5 advances and the piston 8b of the cylinder 8a is retracted, the solenoid valve 7 provided on the pipe for supplying the pressure medium to the cylinder 8a and the pressure medium are supplied to the cylinder 5 Open the solenoid valve provided on the pipe at the same time. Then, at the same time as the piston 4 of the cylinder 5 contracts, the pistons 8b of the plurality of cylinders 8a start to advance. When the pad 9 at the tip of the piston 8b of each cylinder 8a contacts the coil 10, the piston 8b stops when the cylinder 8a receives a predetermined reaction force. At the same time, or after the piston 8b of the cylinder 8a stops, the arm 2
When the load applied to the coil 10 via the coil becomes sufficient to hold and support the coil 10, the retreating movement of the piston 4 stops, and in this state, the arm 2 moves the pad 9. The coil 10 is sandwiched therebetween.

In this case, as shown in FIG. 2, all the pads 9 contact the coil 10 and the arm 2 holds the coil 10 through all the pads 9, so that the coil 10 Is the same as the case where the coil 10 has a flat outer peripheral surface. Therefore, even if the pinching force required to stably support the coil 10 is applied to the coil 10, the pressure applied to the outer peripheral surface of the coil is small, and the copper tube itself does not collapse, and
There is no deformation of the groove.

[0015]

As described in detail above, according to the present invention,
Even if there is a step on the outer peripheral surface of the coil, the divided pads are arranged so that the distance between the coil and each coil can be adjusted, so that the movable part of the tongue faces the coil while adjusting the distance between the pad and the coil. As a result, all the pads come into contact with the coil and hold the coil with the same contact area as when there is no step in the coil. Therefore, it is possible to reliably prevent the copper tube or the like constituting the coil from being crushed, deforming the groove on the outer peripheral surface of the copper tube, or dropping the coil. In addition, since a step may be present on the outer peripheral surface of the coil, it is not necessary to cut the copper tube with a so-called end stop, and the unit weight of the coil can be made to match a predetermined value, thereby significantly improving the yield. it can.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a coil tong according to an embodiment of the present invention.

FIG. 2 is a diagram showing the operation thereof.

FIG. 3 is a schematic view showing a conventional coil tong.

FIG. 4 is also a diagram showing the operation.

[Explanation of symbols]

 Reference Signs List 1; support arm 2: L-shaped arm 3, 9; pad 4, 8b; piston 5, 8a: cylinder 6: pad base 7: solenoid valve 10: coil

Claims (1)

[Claims] 1. A coil tong for transporting a coil with the coil interposed therebetween, a base, a pair of movable parts movably provided on the base and moving close to and away from each other, and one row on each of opposing surfaces of the movable parts. A plurality of cylinders, and a pad provided at the tip of the piston of each cylinder, while adjusting the advance distance of the piston of the cylinder, the movable portion sandwiches a coil between them. A tongue for a coil, wherein the tongs are gripped by approaching each other.