SU67029A1 - Single rope grab - Google Patents

Description

In known grabs, equipped with a cylinder suspended to the hook of the lifting mechanism, carrying jaws articulated with it, and a rod moving inside the cylinder, which opens the jaws after turning the folding dogs fixing the rod relative to the cylinder, the fall of the bar is accompanied by a blow against the bottom of the cylinder.

In order to absorb shock, the rod according to the invention is supplied with a piston, which, when the rod is lowered, compresses the air in the cylinder to form an air cushion, absorbing the impact.

In FIG. 1 shows a grapple cross-section; FIG. 2 is a side view of the grapple with a partial cut; FIG. 3 shows a section along the line L - L of FIG. one.

When the grapple is closed and suspended from the crane's hook, the wedge 15, being in the lowered position, enters between the dogs 2 and unclamps them. The dogs are pivoted on the hinges 4 mounted in the head 5 of the stem, and with their bevelled planes they rest on the annular surface of the washer 3. In such a position of the dogs and the wedge, the rod 8 cannot go down and open the bucket. On

the end of the rod is pivotally suspended traverse A, carrying both halves of the bucket, suspended on rollers 6.

Both bucket halves are connected by t-gam 7 with a second cross-bar B sliding along a square guide. C suspended on bolts 13 to washer 3.

A cylinder D is placed in the guide C, the bottom 12 of which is provided with openings 9 for slowly releasing air from the cylinder while lowering the rod and the piston 10 mounted on it, which compresses the air trapped in the cylinder. The purpose of the piston 10 is to soften the impact of the rings 11 on the bottom 12 of the cylinder. At the final moment of the lowering of the stem (opening of the buckets), a pressure of up to 13 atm is formed in the cylinder, which then drops to normal when air is released from the cylinder through the holes 9.

The grapple is fully opened when the piston of the rod reaches the bottom of the cylinder and takes the position shown in the dashed lines. The piston is lowered, and consequently, the buckets are opened by means of a cable 16 fixed on the lever 14, while the lever 14, over which the wedge head 15 is located, will rotate around the hinge 17 and bring the wedge out of its initial position. Dogs 2 is free of vehicle and will fall inside the cylinder. The piston rod goes down - and opens the grab. When the grapple is opened, yoke A is in the lower position.

In the opened state, the grapple is lowered with the help of a crane onto a pile of bulk material and, thanks to its own weight, smashes into it at a certain depth. In order to close the grapple while simultaneously capturing a certain amount of material, it is necessary to lower the crane hook along with guide C to its lower position. When lowering the guide C of the close-coupled head of the dogs 2, the hole of the washer 3 will freely enter. Next, the washer 3 will press on the protrusions of the dogs 2 and thereby

push them apart. At this moment, the wedge 15, under the influence of its body, will fall and the ban of the dog. Crane switch to lift. Guide C, and along with it, the traverse A, will start to rise.

Subject invention

A single-roll grab, which encloses a cylinder carrying jaws articulated with it and moving a rod inside the cylinder, opening the jaws, characterized in that, in order to form an airbag, a shock-absorbing shock that occurs when the grapple is opened, the rod has a piston 10 compressing when the boom is lowered, air is contained in the cylinder.

FIG. one

.J.

FIG. 3