SU1498694A1 - Multijaw grab - Google Patents

Abstract

This invention relates to a lifting and transport machinery. The purpose of the invention is to increase the grader’s scooping capacity. The device comprises a yoke 1, jaws 3 fixed on it, a lifting mechanism 4 and a jaw closing mechanism 5. The groups of jaws are made of different widths. When scooping, the narrowest jaws close at the beginning, which penetrate the material and increase the reproducing force to increase the scoop by subsequent groups of jaws. The drive is made separate for each jaw and comprises a drum made of adjustable sections, freely mounted on the drive shaft and having a device for activating a rigid connection thereof with the shaft. A crown with internal teeth is mounted on one of the drum sections, and a gear wheel with external teeth moves along the shaft.

the drum is engaged at the closing of the jaws when the said wheels engage. 4 hp f-ly, 7 ill.

Description

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The invention relates to the field of lifting and transport machinery.

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

FIG. 1 shows a grab, about-S.I. species; in fig. 2 is a diagram of a nine-grab grab, plan view; in fig. 3 — drive drum structure; in fig. 4 shows the arrangement of the sections of the drums with the gear wheels in the case of simultaneous scooping of the material with all the jaws; in fig. 5 - the same, in the case of scooping material alternately with two groups of jaws; in fig. 6 - the same, in the case of scooping the material alternately with three groups of jaws; in fig. 7 is a section A-A in FIG. 3

The grab contains the yoke 1, 2 jaws 3 connected to it, a lifting mechanism 4 and a jaw closure mechanism containing a polyspast system 5 with drums 6 and a drive 7. The device contains several groups of mutually balanced jaws 8-10, which are made of different widths . Each drum 6 sets in motion one jaw and consists of separate adjustable sections 11. Cables 12 of the closing mechanism are fixed on traverse 1 and on the corresponding drum. Each drum 6 is mounted on the shaft 13 with the possibility of free rotation relative to it. The gear rims 14 and 15 with internal teeth are mounted on one of the sections and on the end 16 of the drum. In the crown 14 there are depressions 17 for engaging it through spring-loaded sliders 18 with drum section 11 6. The drum shaft 13 is made with a screw thread 19, along which the nut 20, which is connected through the thrust bearing 21 to the gear wheel 22 with external teeth, moves during its rotation mi One end of the spring 23, covering the shaft 13, is connected to the nut 20, and the other end through the ball retainer 24 - by a sleeve 25 installed on the end face 26 of the drum 6. When the drive is constantly running, the drum 6 starts to wind the rope when the gear 22 moved by the nut 20 will engage with the ring gear 14. To unwind the ropes, the drive is turned in the other direction, the nuts are displaced along the shafts to the initial position (to the end 26) and the wheels 22 follow.

By installing the drum section 11 with the ring gear 13 to different positions on the shaft, it is possible to achieve multiple-time closing and opening of the jaws (Figs. 5 and 6). When the first group of mutually balanced jaws 8 is closed, the mass of material between these jaws adds to the static load from

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dead weight of the grapple, as a result of which a force arises, grabbing the grapple and ensuring the possibility of introducing subsequent groups of jaws with a greater width of petals to the same or greater depth. Next, the group of jaws 9 closes, increasing further by the coring force and allowing the next group of jaws 10 to capture more material. After scooping, the grapple is moved to the storage location, the jaws are opened and the grapple is emptied.

Claims (5)

1. A maxillary grab containing a traverse with blocks placed on it, groups of mutually balanced jaws pivotally connected by rigid rods with a traverse, blocks mounted on the upper ends of the jaws, a lifting mechanism and a jaw closing mechanism containing driving drums and cables mounted on shafts the envelopes of the traverse and jaws, characterized in that, in order to increase the scooping capacity of the grapple, the jaw closing mechanism is made separate for each group of jaws. 2. A grab according to claim 1, characterized in that the groups of mutually balanced jaws are made of different widths. 3. The grab under item 1, characterized in that the jaw closing mechanism is equipped with additional drums, the total number of drums corresponds to the number of jaws, and each drum is mounted on the shaft for free rotation relative to it and provided with a device for switching on a rigid connection of the drum shaft, with the ends of each cable secured on the traverse and on the corresponding drum. 4. Grapple, on PP. 1 and 3, characterized in that, in order to expand the technological capabilities, each drum consists of connected in series with the possibility of swapping removable sections. 5. Grab on PP. 1, 3 and 4, characterized in that the device for activating a rigid connection between the drum and the shaft contains gear rims with internal teeth, one of which is fixed on one of the ends of the drum, and the other on one of its sections with the possibility of one-sided rotation relative to a drum, a gear wheel with external teeth corresponding to the gears mentioned above, connected through a thrust bearing with a nut placed on a drum shaft made with screw thread and a spring covering the shaft, one end of which is connected to the nut and the other the goy is connected via a ball retainer with a sleeve that covers the shaft from the side the other end, the gear wheel being connected to the shaft by means of splines. Priority points: 07.07.86 in paragraphs 3-5 ten eight FIG. 2 21 and Phage. five 7 6 7 Srig.5 6 1and 6 / Srig. ig.6 /five / 7 FIG. 7