SU1548152A1 - Grab for logs - Google Patents

Abstract

The invention relates to lifting devices, in particular to log grabs. The purpose of the invention is to increase the reliability of the grapple. The grab contains a frame 1 on which the jaws 2 and 3 are connected with the hydraulic cylinder 4. On the frame 1, on both sides of the symmetry plane of the grapple, the two shoulders are mounted pivotally to the levers 7 and 8. The grapple is equipped with arms 9 and 10. Each end is connected at one end with a hook of the load-lifting mechanism, and the other with a short arm of the corresponding clamping lever. The long arm of each of the levers 7 and 8 is connected with a corresponding jaw by means of flexible elements 14 and 15. When the jaws 2 and 3 are opened by the hydraulic cylinder 4, the flexible elements 14 and 15 rotate around the axes towards the jaw and the long shoulders of the pressure levers 7 and 8. When the grapple is lowered onto the stack, and the long arms of the levers 7 and 8 lie down on the surface of logs piles. In the scooping process, the jaws 2 and 3 are closed, and the flexible elements 14 and 15 are loosened. As the grab fills, the levers 7 and 8 under the influence of logs tend to take a position close to horizontal. After the load is loaded, the short arms of the levers 7 and 8, carried by the rods 9 and 10, turn around the axes and lay with the lower long arms on the load (logs), pressing it against the internal surfaces of the jaws and ensuring reliable holding load grab. 5 il.

Description

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levers 7 and 8 as the jaws go down, they lie on the surface of the logs of the stack. In the scooping process, the jaws 2 and 3 are closed, and the flexible elements 14 and 15 are loosened. As the grab fills, the levers 7 and 8 under the action of the logs tend to take a position close to horizontal. After a set of cargo in the process

All lifting grab lifting -. the mechanism of the short arms of the levers 7 and 8, carried along by the rods 9 and 10, rotates around the axes and lies down. lower long shoulders on the load (logs), pressing it to the inner surfaces of the jaws and thereby ensuring reliable retention of the load in the grab. 5 il.

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

The purpose of the invention is to increase the reliability of the grapple in operation.

FIG. 1 shows a grab without a load with closed jaws, general view; in fig. 2 - the same, with the jaw maximally opened; in FIG. 3, a grab, with the closed jaw of which the load is pressed, the general view; in fig. 4 - the same, top view; FIG. 5 is a view A of FIG. four.

The grapple comprises a frame 1, on which the jaws 2 and 3 are hinged, made forcibly by a rotary actuator, for example, a hydraulic cylinder 4, the movable parts of which can be fixed, for example, to the jaw 2 and 3. To actuate the hydraulic cylinder 4 on the frame 1, an electric motor, a pump and a distributor (not shown) can be mounted. On frame 1 on either side of the plane of symmetry of the grab, the two-arm swivel clamping levers 7 and 8 are hinged on axles 5 and 6. The grab is also equipped with bars 9 and 10, the number of which may be two or more. The number of tg can correspond to and not correspond to the number of clamping levers 7 and 8. Each of tg 9 and 10 is connected at one end to a hook 11 of a lifting mechanism, for example, by means of a simple connection that includes lugs at the end of each of tg, which includes an axis 12 (fig. 3) as well as an earring 13, which is attached to the hook 11 of a lifting crane. Other options are possible for the mobile connection of plugs 9 and 10 to the hook of the crane 11. The second ends of the corresponding plugs 9 and 10 are rotatably connected to the short arms of the clamping levers 7 and

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5 8. These connections (tg with levers) can be single- or multi-stage articulated joints, for example, ball, spherical or any other known hinges. The task of t g 9 and 10 is to provide a pressure turn of the levers 7 and 8 under the action of the mass of the grab and the load. On each side of the plane of symmetry of the grab, one or several clamping levers 7 and 8 o can be installed. All levers 7 can be united by a common jumper for them, levers 8 can also be united by a common jumper. In this case, the levers 7 can be connected to one or two tons of gam

9, and all the levers 8 can be connected to one or two levers 10. The levers 7 are set offset from the levers 8 so that one can move between the other (Fig. 4). The number of levers 7 and 8 can be equal to the number of t g 9 and

10, with each of the levers 7

and each of the levers 8 is connected to its corresponding stage 9 or 10 (Fig. 4). In this case, the rotation of each lever 7 and 8 is autonomous, which allows the clamping levers 7 and 8 to copy in the best way the form of the load (logs) pressed to the jaw 2 and 3.

The long arms of the levers 7 and 8 are connected with opposite jaws 2 and 3 by means of flexible elements 14 and 15. The length of each flexible element 14 and 15 corresponds to the distance between the areas of its attachment to the corresponding jaw and lever when the jaws 2 and 3 are closed (Fig. 1). This is done for reasons of providing rotation of the levers 7 and 8 through the flexible elements.

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14 and 15 when opening the jaws 2 and 3. Jaws 2 and 3 can, if necessary, be connected to each other and the frame 1 by a synchronizer of rotation of any known construction, for example, in the form of tons of 16 and 17 (Fig. 2 and 3)

The grapple works as follows. When the grab is closed (its jaws 2 and 3 are closed), the levers 7 and 8 occupy the lowest positions (Fig. 1).

To open the jaws 2 and 3, the hydraulic cylinder 4 is rotated. The jaws 2 and 3 rotate around the axes of their rotation on the frame 1 through the flexible elements 14 and 15 tons of chickpeas and clamping levers 7 and 8, which also rotate around their axes , respectively 5 and 6, and disclosed (Fig. 2).

In this position, the grab is lowered by a crane or a manipulator onto a stack of timber. Jaws 2 and 3 under the force of gravity of the grab recess into the pile, and the long arms of the levers 7 and 8 lie down on the surface of the logs as the jaws penetrate.

In the scooping process, the jaws 2 and 3 are closed, and the flexible elements 14 and 15 are loosened. As the grapple is filled, the levers 7 and 8 under the influence of logs tend to take a position close to the horizontal one. T-gi 9 and 10 should not interfere with such a turn of the levers 7 and 8. For

guaranteed connection of such events hook 11 (in the period of scooping) down as close as possible to the frame 1.

After the load is loaded, the short arms of the levers 7 and 8, carried by the rods 9 and 10, rotate around the axes 5 and 6 and rest with the lower long shoulders on the load (logs), pressing it against the internal surfaces of the jaws and ensuring that the grapple is lifted by a lifting mechanism. thus, reliable retention of the load (logs) in the grab (Fig. 3). In this position, the grab is moved by means of a lifting mechanism to the place of unloading, where by turning the jaws with the help of a hydraulic cylinder 4, the grab is released from the load.

Claims (1)

Invention Formula A log grab containing a frame with a bracket for hanging onto a hook of a load-lifting mechanism, on which the jaws with a power drive for their closing are hinged and a two-arm clamping levers, with in order to increase reliability in operation, it is equipped with tangs and flexible elements, with one ends of tg being hingedly connected to the short arms of the pressure levers, while others are hingedly connected to the bracket, while the long arm of each of the pressing arms is connected by a flexible element to the opposite one jaw. Schi 4 (Reg. I dida 12, FIG. five