SU1106781A1 - Multijaw grab - Google Patents

Abstract

A PEGOCAULAR GRAPHER, containing a head connected by means of jaws to jaws, which are alternately connected pivotally to two crossbars located one under the other, and the drive of the jaws, characterized in that, in order to increase the scooping capacity, the drive of the jaws is the chain hoist, the blocks of which are located on the head and traverse. x, while on the lower traverse of the blocks it is less than on the top, (L Oi 00

Description

The invention relates to a vehicle, in particular to a hoisting machine, and can be used as a lifting body for cranes.

A multi-maxillary grab is known, which contains a head connected by means of t to jaws, which are alternately connected pivotally to two crossbars located one under another, and the drive of the jaws I.

However, the known grapple has insufficient scooping ability.

The purpose of the invention is to increase the grabbing ability of the grapple.

The goal is achieved by the fact that in a maxillary grapple containing a head connected by means of t jaw jaws, which are alternately connected hingedly to two crossbars, located one under the other, and the drive of the jaws, the latter is a pulley, which blocks are located on the head and crossheads , while on the lower traverse of the blocks is less than on the upper.

FIG. 1 shows the proposed grapple, general view; in fig. 2 shows section A-A in FIG. one; in fig. 3 is a view B in FIG. one; in fig. 4 - scheme of the chain hoist.

The grab consists of a head 1, an upper traverse 2 and a lower traverse 3. A pair of jaws 4 is hingedly connected with a traverse 2, and a pair of jaws 5 is connected with a traverse 3. The jaws of each traverse at a 4-jaw grapple are jointly synchronized with each other 6. In grabs with a large number of jaws (6-8, etc.), the installation of synchronizers is not needed.

With the head of the jaw are connected by means of rods 7. A rope 8, coming from the drum of a lifting winch, bends around a block fixed to the upper part of the head, and a rope 9, going from the drum of the closing winch, is stored in block head clips, traverse 2 and 3 {FIG. four).

For the chain pulley connecting the head and the traverse 3, the cage blocks, the traverses 2 play the role of a bypass, i.e. Employees to change the direction of the flexible element. A similar role is played by the blocks of the traverse 3 for the tackle connecting the upper head and the traverse 2.

The opening of the empty grapple is carried out as follows.

The lifting rope supports the head 1, and the locking cable is wound from the locking winch drum. Here, the cross arms 2 and 3 are lowered, opening the jaws 4 and 5.

The lowering of the empty grapple on the material is made by winding with the lifting and closing winches of the lifting and closing ropes.

The scooping of the material is complete: u; It is winding the closing loops of the coil: about; s on the drum of the locking winch with the hoisted rope. The jaws connected to traverse 2 are first inserted into the frozen material, since traverse 2 is fastened to the head with sum total tension force of 8 branches (Fig. 4) of the polyspast, and traverse 3 is fastened to the head by force of only two branches.

After the penetration resistance of the jaws connected to the head plate 2 to the material being transported increases significantly, the jaws connected to the head plate 3 also begin to sink into the material. By the end of the closure of the second pair of jaws, it will significantly lag behind the first one and its closure will be performed at coMKiiyty jaws x Traverse 2. Consequently,

at the end of the scooping, not only the weight of the grapple will be transferred to the jaws connected to the crossmember 2, but also the weight of the material scooped into the jaws connected to the crosshead 2, which will dramatically increase their depth in the material. Therefore closing

the hoist during the scooping period is a differential system, where the multiplicity of the hoist connecting the traverse 2 to the head is greater than the multiplicity of the hoist connecting the traverse 3 to the head.

During the scooping period, the frequency of the tackle traverse 2 is equal to the ratio of the number of bearing branches of the traverse 2 to the number of branches going to the drum (Fig. 4)

IT i - 4

Tz kg

and the multiplicity of the polyspast traverse 3 is equal to the ratio of the number of bearing branches of this traverse to the number of branches going to the drum:

i - tg 4

shz- 1

Other combinations of polyspasts and traverses 2 and 3 are possible, depending on the properties of the transported load. Thus, for more difficultly packed or frozen materials, a ratio of

four- - .

Imio

The use of such grabs will allow

to increase the relative scooping capacity (the ratio of the mass of the scooped material to the mass of the grapple) during transportation of hardly scooped, frozen materials by 10-15 ° / o. Grab

can be used for excavation of soil, mine shaft drilling and other works.

Claims (1)

MULTI-JAWED GRAPPER containing a head connected by means of rods to the jaws, which are alternately pivotally connected to two traverses located one below the other, and a jaw drive, characterized in that, in order to increase scooping ability, the jaw drive is a pulley, the blocks of which are located on head and traverses, while the lower traverse of the blocks is less than the upper, FIG. 1 110678 I