SU880949A1 - Clamshell - Google Patents

Description

(54) GRAYFER

I

The invention relates to lifting devices, in particular to grabs.

A grab is known that contains an upper to lower traverse, blocks located between them with a rope around them, jaws pivotally attached to the axes of the blocks and to the lower traverse (1.

A disadvantage of the known grapple is that when it is used, there is no possibility of a cargo being poured out in small adjustable portions. This grab design is designed to empty all the bulk cargo contained in it. When unloading cargo onto a conveyor with such a grapple, a significant part of the load is poured out beyond the limits of the conveyor belt, which not only reduces labor productivity, but can also cause frequent breakage of the conveyor. For this reason, a known grapple is generally not used to feed bulk material onto a conveyor, and this hard work is often done manually.

The aim of the invention is to increase productivity.

This objective is achieved in that each jaw is provided with a pivotally attached

there are gears interacting with the bottom and a gear gear interacting with the leaf, with gears interacting with each other, with an additional gear interacting with the gear of this jaw fixed on one of the jaws, and a lever lock fixed on the axis of the jaw and spring loaded to the other jaw. latch gear of the jaw.

FIG. I shows a side grapple; in fig. 2 - the same, frontal view, discharged by one of the jaws of the grapple.

Claims (2)

The grab contains the jaws 1 n 2 and the mechanism for controlling the opening and closing of the jaws, which includes the lower yoke 3, the telescopic bar 4, top, 5 yoke 5, loads 6 n blocks 7, interacting through the ropes 8 with the upper yoke 5. Each jaw is connected with the lower traverse 3 using axles 9. On the upper traverse of the grapple there is a loop 10 for hanging it on a rope. Each lower jaw in the lower part ends with a turning flap 11 installed between the cheeks of the jaw on axis 12. The flaps are connected through a system of t r 13, gears 14-16 and levers 17 with a handle 18. Thus, each flap is connected with a handle 18 along the other side of the grapple's jaws (see Fig. 2), the gears 16 being pressed onto the roller 19 mounted between the cheeks of the jaw 2. The levers 17 are rigidly attached, for example, by welding to the gears 16 and fixed in the extreme upper position the shutters AND are in the closed position, shown in Fig. 1 and 2) using the latch 20 of the lever. In order that the flap of the jaw 1 does not open arbitrarily when the grapple is opened, there is a spring-loaded clamp 21 hinged on the cheek of the jaw 1 and interacting with the stop 22 fixed on the cheek of the jaw 2. In FIG. Figures 1 and 2 show a variant of manual control of the flaps, although it is not difficult to carry out remote control by acting on the levers 17 or the gear 16 of the respective hydraulic or electric actuators. The proposed grapple works as follows. In the position shown in FIG. 1 and 2, the grab is suspended on a winch cable from an overhead crane. When the grapple is lowered into the bulk material mass, the grapple jaws open under the action of weights b that cause the jaws to rotate around the axes 9. In this case, the stop 22 releases the retainer 21, which with its tooth stops the gear 15 (gear 14 is fixed by fixing the handle 18 with the retainer 20 in the extreme upper position shown in Fig. 1). When the rope is completely loosened, the grapple's jaws open fully, sinking into the bulk material. The rope is then pulled by a winch, the upper traverse is lifted, dragging loads 6 through the ropes 8 and blocks 7. The jaws close, seize the material, and when fully loaded, the stop 22 releases the gear 15 from the retainer 21, and the gear 15 into its the queue is engaged with the gear 14. The grab is moved to the zone of operation of the conveyor and installed in a suspended state directly above the conveyor belt. Having released the lever 17 from the lock 20, the handle 18 smoothly moves downwards. At the same time, the flaps 11 synchronously open, ensuring the gradual ejection of the material. The magnitude of the opening of the valves is selected depending on the speed of movement of the conveyor belt. In order to completely release the grab from the load through the flaps 11 a vibrator can be used. Using a grapple frees two to three workers from loading the molding material onto the conveyor manually. The annual economic effect is about 2000 p. Claims of the invention: A grab containing upper and lower traverses, blocks between them with an envelope of rope, jaws pivotally attached to the axes of the blocks and to the lower traverse, characterized in that, in order to improve performance, each jaw is pivotally attached to it from below a flap and a gear gear interacting with the flap, the gears interacting with each other, with an additional gear interacting with the gear of this jaw fixed on one of the jaws, on the axis of which second fixed arm and latch lever, on the other jaw is pivotally mounted a spring-loaded latch of the gear teeth. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 404755, cl. 66 C 3/12, 1966 (prototype). : -Y /. in w in N .sixteen