JPS5820627Y2 - Electric tongs for lifting heavy objects - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to electric tongs for lifting heavy objects installed in steel factories and the like.

Electric tongs installed in steel factories for the purpose of transporting slabs, etc., are lifted by long and heavy objects, so the tongs themselves are inevitably large.

However, since the space in the factory building, that is, the space for lifting and lowering the tongs, is restricted, the movement of the tongs (the amount of vertical movement of the mechanism) that pinches and releases the object to be lifted must be as small as possible, and the movement of the tongs must be as small as possible depending on the dimensions of the object to be lifted. The distance between the clamping claws can be determined in advance, and furthermore, in the operation of clamping and holding an object to be lifted, the lower limit position of the tongs can be automatically set in a state that satisfies the appropriate response of the clamping claws to the object to be lifted. It is also desirable that the movement of the link mechanism, etc. that gives the clamping claws the clamping and releasing (opening and closing) operations be always equally balanced.

The present invention provides a tong that satisfies the above-mentioned demands, and will be described below based on one embodiment thereof.

That is, Fig. 1 is a side view of the tongs of the present invention, and Fig. 2 is a side view of the tongs of the present invention.
The figure is a front view showing the left half of the entire tong, in which the structure shown in Fig. 1 is provided symmetrically on both sides of the tong, and the structure shown in Fig. 2 is also provided distributed on the left and right sides. There is.

Reference numeral 1 designates a main horizontal beam, to which suspension rods 3 are attached with pins 2 at both left and right ends, and a pair of opposing bearings 4 are fixed to the lower portions of both ends, respectively.

Spur gears 5 that mesh with each other are pivotally supported between the bearings 4, and two sector gears 6 that mesh with each spur gear 5 are provided opposite each other. The upper ends of a pair of operating links 8 for Japanese text are fixed to a key.

Reference numeral 9 denotes an operating lever whose upper end is pivotally connected to the lower end of the link 8 with a pin 10, and to the lower end of the operating lever 9 is fixed a holder mounting hardware 13 for mounting and fixing a holder 12 to which a clamping claw 11 is attached. ing.

The holder mounting hardware 13 not only fixes the holder 12 but also has the role of setting the distance between the opposing clamping claws 11 in accordance with the width of the lifted object A. and a screw shaft 15 for moving the holder 12 forward and backward.

Reference numeral 16 denotes side plates that sandwich the lower half of the operating lever 9 from left and right sides, each end of which extends through the operating lever 9 (connected with a pin 17, and the inner side plate 16 is connected with an auxiliary horizontal beam 18). Therefore, the tong mechanisms as described above, which are arranged oppositely on the left and right sides, are integrally connected by the auxiliary horizontal beam 18, and the operating lever 9 is connected to the side plate 1.
The operating lever 9 rotates (opens and closes) using the pin 17 that connects the auxiliary horizontal beam 18 as a fulcrum, and the opening degree of the operating lever 9 (the distance between the clamping claws 11) is determined by the auxiliary horizontal beam 18 relative to the main horizontal beam 1 described earlier. It is determined by the position of , that is, the distance between both horizontal beams.

That is, when the distance between both horizontal beams 1.18 is small, the operating lever 9 opens, and when the distance is the opposite, it closes.

Reference numeral 19 designates a plurality of contact members disposed on the auxiliary horizontal beam 18, and is equipped with a mechanism that is mounted perpendicularly to the auxiliary horizontal beam 18 and moves up and down to determine the amount of downward protrusion. .

In other words, for example, the cylinder 20 and the rod 21 assembled therein are arranged, and the stopper 22 is designed so that the protrusion amount of each rod 21 is determined equally, and maintains this state when one protrusion amount is determined. Just set it up.

The contact member 19 is in equal contact with the upper surface of the lifted object A,
The lower limit position of the tongs is automatically determined, and when this position is determined, the clamping claws 11 move the object A to be lifted.
The most appropriate measures should be taken to clamp and hold the material.

In other words, the clamping claws 11 are connected to the holder mounting hardware 13.
The height position changes depending on the fixed position of the holder 12 against the object A, and if the amount of protrusion of the contact member 19 is determined in advance according to this position, the clamping claw 11 can be set at the optimum position for the object A to be lifted. The lower limit position of the tongs is when they are opposite to each other.

23 is an electric drum mounted on the main horizontal beam 1;
The wire rope 24 wound around this drum 23 is hung around a pulley 25 provided on the auxiliary horizontal beam 18 described above and pulleys 26 and 27 provided on the main horizontal drum 1, and is hung from the above-mentioned electric motorized By driving the drum 23, the auxiliary horizontal beam 18 is easily moved up and down.

The present invention has a structure as described above with respect to its embodiments. First, the position of the holder 12 is determined in order to determine the distance between the clamping claws 11 according to the dimensions of the lifted object A, and The amount of protrusion of the contact member 19 is adjusted in advance, and the distance between the main horizontal beam 1 and the auxiliary horizontal beam 19 is determined by driving the electric drum 23.
The most convenient and appropriate operating lever 9 for clamping and holding the
In other words, the distance between the clamping claws 11 can be maintained.

At this point, operate the crane to lower the tongs toward the object A, stop the descent when the tip of the contact member 19 comes into contact with the top surface of the object A, and then lift the main horizontal beam 1. At the same time, depending on the lifting amount, wire rope 2
4, the movement (rise) of the main horizontal beam 1 is transmitted to the actuating lever 9 via the actuating link 8, and the actuating lever 9
The legs are closed, and the clamping claws 11 are evenly pressed against the sides of the object A to be firmly clamped and held.

Therefore, all you have to do is operate the crane in this state and transport it to the required location.

In addition, when releasing the hoisted object A, after the hoisted object A has properly landed on the floor, the main horizontal beam 1 is further lowered by a small amount to operate the operating lever 9 to open the legs and release the clamping claw 11. can be done.

At this time, if the wire rope 24 is wound up on the electric drum 23 according to the amount of descent of the main horizontal beam 1, the operating lever 9 can be opened in the most appropriate position when lifting the tongs again and moving on to the next clamping operation. Maintain leg posture.

In addition, in the present invention, since the sector gear 6 keyed coaxially with the operating link 8 is connected via the two spur gears 5, the movements of each operating link 8 are completely synchronized as one unit. As a result, the behavior of the clamping claws 11 is completely consistent, and the tongs themselves do not tilt, thereby achieving safe, reliable, and smooth operation at all times.

According to the present invention, the pair of clamping members that can be moved separately from the lower ends of the pair of actuating levers are provided, so that the movement for clamping and releasing the lifted object is small and limited. Application in confined spaces is advantageous.

In other words, the distance between the clamping claws can be adjusted in advance according to the size of the object to be lifted, and the lower limit position of the tongs can be set in accordance with the position of the clamping claws. Because of this structure, it can be expected to improve operational efficiency and save labor.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, with FIG. 1 being a side view and FIG. 2 being a partial (left half) front view. 1 is the main horizontal beam, 3 is the hanging rod, 4 is the bearing, 5 is the spur gear,
6 is a sector gear, 7 is a shaft, 8 is an operating link, 9 is an operating lever, 11 is a clamping claw, 12 is a holder 13 is a holder mounting hardware, 16 is a side plate, 17 is a pin, 18 is an auxiliary horizontal beam, 19 is Contact members: 23 is an electric drum, 24 is a wire rope, 25°26.27 is a pulley.

Claims (1)

[Scope of utility model registration request] A main horizontal beam having suspension rods at the upper part of both ends and bearings at the lower part, a pair of spur gears that are respectively pivotally supported by the bearings of the main horizontal beam and mesh with each other, and a pair of spur gears that mesh with each of these spur gears, respectively. A sector gear, a pair of operating links whose upper ends are coaxially keyed and intersect with each other so that they can move together, and whose upper ends are pivoted to the lower ends of these operating links so that they intersect with each other and intersect with each other. A holder mounting hardware having a feed screw shaft therein, which is fixed and installed horizontally, and a front end of the holder mounting hardware which is slidable along the holder mounting hardware and is attached so that it can be moved forward and backward by the feed screw shaft and fixed at each predetermined position. A pair of actuating levers each equipped with a holder having a clamping claw, a side plate sandwiching these actuating levers and connecting them with a pin penetrating each actuating lever, and connecting the side plates located inside the pair and having a plurality of lengths along the entire length thereof. an auxiliary horizontal beam that is provided with a contact member that has a function of adjusting the amount of downward protrusion at a location and a pulley at an appropriate location on the left and right; a pulley that is attached to the main horizontal beam and is connected to the pulley of the auxiliary horizontal beam; Electric tongs for lifting heavy objects, characterized in that the electric tongs are equipped with an electric drum for winding up a wire rope mounted on a beam and hung from each of the above-mentioned pulleys.