JPS6124307B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tong type crane, and more particularly to a gripping device thereof.

BACKGROUND ART Tong-type cranes having a plurality of sets of tongs on a hanging beam are conventionally known. In the case of this type of tong-type crane, if the load to be handled, such as a slab, is of the same width, a uniform force is applied to both sides of the slab, but if the width of the slab differs at the position corresponding to the tongs. A problem arises. That is, if all the tongs open and close synchronously with the same opening and closing width, the slab will not be gripped uniformly by all the tongs, and the slab will fall.

Therefore, a tong-type crane was proposed in which each tong can be opened and closed independently, making it possible to reliably grip slabs even if the width of the slab is not uniform. However, with this type of tong crane, when grabbing slabs of different widths, even after one tong has grabbed the wide part, the tongs that grip the narrow part have to hold the wide part until the tongs that grip the narrow part can securely grip it. The gripping tongs had to be kept waiting, and the gripping work could not be done efficiently and in a short time.

In addition, if the slab is curved in the same plane, for example, the gripping part of the tongs will not contact along the side edge of the slab, but will only make partial contact, ensuring that the slab is properly gripped. The drawback was that it was not possible to hold the device.

The present invention eliminates the above-mentioned drawbacks of the conventional art, and provides a tongs-type crane configured to be able to reliably grip even a slab whose width varies along the longitudinal direction and is curved in the same plane. It provides:

Hereinafter, details of the present invention will be explained in conjunction with embodiments shown in the drawings.

1 and 2 explain the entire crane according to the present invention. In the figures, reference numeral 1 indicates a horizontal beam, and both ends of this horizontal beam 1 are connected to the second
As is clear from the figure, the sheave 4 is connected via the bracket 2 to the sheave 4 which is suspended by the main winding wire 3. The upper ends of a pair of left and right links 6 are rotatably supported on the lower side of the horizontal beam 1 via a support frame 5 by a shaft 7 in a loose fit with some play. At the lower ends of these links 6, approximately L
The upper end of the tongue piece 8, which is curved in a letter-like shape, is rotatably supported via a shaft 9 in a loose fit with some play. The tongue pieces 8, 8 extend downward in an intersecting state, and there is a horizontal connecting piece 10 along the way.
It is rotatably supported via a shaft 11 in a loose fit with some play.

As is clear from FIG. 2, the tongs configured as described above are provided in multiple sets for the horizontal beam 1.
In this embodiment, four sets are installed in parallel.

The horizontal connecting pieces 10 are arranged on both sides of each set of tongs, and as is clear from FIG. connected by. That is, one end of the opening/closing beam 10 is rotatably supported by the pin 13 on the bracket 10a of one of the tongue horizontal connecting pieces 10 in a loose fit with play, and the other end is supported on the bracket 10a of the other tongue horizontal connecting piece 10. Bracket 1 attached to horizontal connecting piece 10 of
It is slidably and rotatably supported via a long hole 15 with respect to a pin 14 implanted in 0b with some play. And opening/closing beam 1
Auxiliary sheaves 18 are attached to the central portions of the two, each suspended by an auxiliary wire 17 via a bracket 16.

On the other hand, a support frame 5 for suspending each tong is attached to the horizontal beam 1 in a configuration as shown in FIG. That is, the support frame 5, which has a shaped cross section, is suspended at its upper end via the bolt 19 with respect to the horizontal beam 1 so as to be freely rotatable in the horizontal direction with some play.
is connected to the horizontal beam 1 on both sides by tension springs 20. Therefore, even if the support frame 5 is rotated about the bolt 19 by an external force, the support frame 5 will be returned to its original position by the tensile force of the tension spring 20 once the external force is removed.

In addition, in each pin joint part with a loose fit made of the shafts 7, 9, 11, pin 13, etc. described above, the outer diameter of the shafts 7, 9, 11, pin 13, etc. and the bearing part thereof are For example, a gap of 0.2 mm was provided in the diametrical direction between the inner diameter and the inner diameter.

Reference numeral 21 denotes a support frame for preventing the tongs from swinging, and is arranged so as to have vertical portions on the outside of both ends of the horizontal beam 1 and on the outside of both ends of each horizontal connecting piece 10. 22 is a frame, 23 is a hoisting barrel, 24 is a hoisting motor, 25 is an opening/closing barrel, 26
is a trolley.

Next, the operation of this embodiment configured as above will be explained.

First, by winding up the auxiliary wire 17, the horizontal connecting piece 10 is raised via the opening/closing beam 12, and the left and right tongue pieces 8, 8 are opened. In this state, loosen the hand-wound wire 3 and lower the main beam 1.
As shown in Figure 1, tong pieces 8 are attached to both sides of the slab S.
position. In this state, the horizontal beam 1 is pulled up by the hand-wound wire 3. Then, the tong pieces 8, 8 are rotated via the link 6 in a direction in which both ends of each tong piece approach each other via the shaft 11, and the slab S is reliably gripped. At this time, as shown in Fig. 4, even if the widths of the slabs S are different, there is also the effect of a loose fit with backlash at each pin joint, so that the left and right pairs of tongs are almost simultaneously connected to the slab S. The gripping operation can be completed in a shorter time than in the conventional device in which only one opening/closing beam 12 is provided over all four tongs. Also, the fifth
As shown in the slightly exaggerated figure, even when the slab S is curved, there is also the effect of a loose fit with play in each pin joint, so that the tip of the tongue piece is attached to the curved side of the slab. Since the support frame 5 rotates so as to reliably fit along the curved slab, it is possible to reliably grip even a curved slab.

Note that even when grasping a curved slab S as shown in Fig. 5, the tongs 8 can be rotated horizontally up to about 10 degrees due to the play of each pin joint. . Of course, due to the backlash of each pin joint, when the tongs 8 are not gripping the slab S, the tongs 8 are a little wobbling, but when the tongs 8 are gripping the slab S, The tongs 8 are neat and can grip the slab S reliably and safely.

As is clear from the above description, according to the present invention, the horizontal connecting pieces of adjacent tongs are connected by an opening/closing beam, and one end of this opening/closing beam is connected to the horizontal connecting piece of one of the tongs by a pin hinge. The structure is such that the other end is attached to the horizontal connecting piece of the other tong through a long hole, and the support frame that supports each tong can be rotated relative to the horizontal beam and can be returned to its original position via a spring. Due to the loose fitting action of each pin joint with backlash, it is possible to complete the gripping work in a short time even with slabs of different widths or curved slabs. , can provide reliable gripping force.

[Brief explanation of the drawing]

1 and 2 are a front view and a side view explaining one embodiment of the present invention, FIG. 3 is a side view explaining the mounting structure of the support frame, and FIGS. 4 and 5 are the state in which the slab is gripped. FIG. 1...Horizontal beam, 3...Main winding wire, 5...
Support frame, 6... Link, 8... Tong piece, 10...
...Horizontal connecting piece, 12... Opening/closing beam, 13, 14
... Pin, 15 ... Long hole, 17 ... Auxiliary wire,
S...Slab.

Claims (1)

[Claims] 1 Attach one set of tongue pieces to one set of links that are attached to the horizontal beam with pin joints and can be raised and lowered freely, and attach a horizontal connecting piece to one set of tongue pieces with pin joints to form horizontal connections. 1 due to lifting and lowering of pieces
In a tong type crane, in which a plurality of tongs each having a set of tongs that can be opened and closed are installed in parallel under a horizontal beam by pin joints, the horizontal connecting pieces of adjacent tongs are connected by an opening and closing beam, One end of this opening/closing beam is pin-jointed to the horizontal connecting piece of one of the tongs, and the other end of the opening/closing beam is pin-joined to the horizontal connecting piece of the other tong through a long hole, and each of the pin joints is loosely connected. The upper end of each tong is attached to the horizontal beam via a support frame attached by a pin joint with a loose fit to the upper end of each tong. A tongs type crane characterized by having a structure in which the support frame is supported on a shaft so as to be rotatable in the horizontal direction, and a tension spring is attached between the support frame and the horizontal beam so as to apply a restoring force to the support frame.