SU1207998A1 - Device for turning and changing overhang of crane boom - Google Patents

Description

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The invention relates to a lifting-transport technique and can be used in devices for turning and changing the boom of a crane.

The purpose of the invention is to increase reliability.

FIG. 1 schematically shows the proposed device, a general view, in FIG. 2 is a section A-A in FIG. I, in FIG. 3 is a section B-B in FIG. 2

The device comprises a boom hinged on the base and two power cylinders 2 and 3 at an angle to each other, connected to each other and to the boom with an operative unit 4, the trunnions 5 of which ensure free rotation of the unit relative to the boom in the vertical plane.

The support unit 4 (Fig. 2) contains a cylindrical support 7 placed in a cup 6 with a groove a (Fig. 3J) carrying the connecting axis 8 of the power cylinders 2 and 3. The end planes of the support interact with the cup 6 by means of a thrust bearing 9 and a crutch 10, and radial surfaces by means of a bearing sleeve 11. In this case, the axis 8 is fixed in the support 7 perpendicular to its longitudinal axis of symmetry, and forming the inner cylindrical surface of the casing is perpendicular to the trunnion 5.

The device works as follows.

When boom 1 moves in space, it is combined with power cylinders. 2 and 3 forms a spatial movable rod system, the position and configuration of which changes as the rods of the power cylinders move. This changes the chi

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with and the mutual position of the power cylinders and boom.

In the process of changing the boom, the rods of both cylinders 2 and 3 move out, and their lugs move relative to each other, rotating on the axis 8. The support 7 rotates together with the cup 6 on the trunnions 5 relative to the boom 1.

When the boom is turned, when the rod of one of the cylinders is pushed in and the other is pulled in, a movement occurs in all degrees of freedom in the support node. The lugs of the cylinders 2 and 3 rotate relative to each other and relative to the common axis 8. The support 7 together with the axis 8 rotates relative to the glass 6 in the transverse plane on the thrust bearing 0 .9, which perceives the resultant from the efforts of both power cylinders, the glass 6 in turn rotates on the trunnion 5 with respect to the boom in the case when the boom is accompanied by simultaneous raising and lowering, which is typical for extending one of the rods with a fixed shaft.

In all these cases, the rotation under load occurs either around the axis 8 or the trunnions 5 of small radius, or on a thrust bearing 9, for example a ball bearing, which does not create significant bending moments on the rods of the power cylinders. I

 In view of the absence of the forces developed in the constructions in the opposite to the Q direction of the bearing 9, the support with the glass is provided in this case by means of a crunch 10, which can also be equipped with a similar bearing.

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Claims (1)

A DEVICE FOR ROTATING AND CHANGING THE CRANE ARROW BOARD, comprising two power cylinders interconnected by means of an axis pivotally mounted to the base at an angle to each other and a support unit mounted along the arrow. le with the possibility of turning in the vertical. a plane and including a cage and a support, characterized in that, in order to increase reliability, it is equipped with thrust bearings mounted on a cage made in the form of a cup, and the support is made of a cylindrical shape with a groove and is mounted to interact with its end planes with the cage by thrust bearings, the axle connections to the power cylinders in _a fixed groove ditch ® Coy cylindrical support. SU „„ 1207998 Fig. / 120799.8