Fixing device comprising a rotary drive for a gripper tool

Abstract

A device for fixing and rotationally driving a gripper tool or the like on the arm of a crane, an excavator or a similar transporting and lifting machine is disclosed. The device includes a housing. An adapter plate including an annular flange is arranged on the housing, the flange being rotatable about the housing by a grooved ball bearing. The housing includes a hydromotor which transmits the rotational movement thereof to the adapter plate by an output flange. The output flange and the adapter plate are axially distanced from each other. Screw bolts transfer the rotary driving force between the output flange and the adapter plate.

Description

BACKGROUND OF THE INVENTION [0001] The invention relates to a device for attaching and for rotary drive of a gripping tool or the like on the boom of a crane, excavator, or a similar conveying and lifting machine, with a housing attached to the boom, the housing receives in its interior a hydromotor with a driven flange and on the side of the gripping tool has an adapter plate that is for attaching the gripping tool and is driven to rotate by the driven flange. [0002] Such a device is known from the operational practice of Applicant. It is schematically illustrated in the exemplary embodiment in FIG. 1. In accordance with it, the device has a housing 1 that is made of the parts 2a, 2b, and 2c bolted together. A hydromotor 12 is inserted rotation-fast in this housing. The hydromotor is driven by a hydraulic fluid that is conducted into and out of the interior of the hydromotor via lines (not shown). The shaft of the hydromotor generally performs only short rotating movements that rot...

AI Technical Summary

Benefits of technology

[0004] The object of the invention is to embody the device of the type cited in the foregoing such that a long service life is assured for the hydromotor during rough continuous operation with impact-like stresses to the adapter plate in changing directions.

[0006] Thus from a static point of view the inventive solution is a complete departure from the known design. That is, the adapter plate is borne on the housing of the device and thus is fixed and supported radially. The purpose of the driven flange now is more for causing the adapter plate to move rotationally. Impacts that act on the adapter plate in the oblique direction are conducted from outside into the stable housing and are safely absorbed there. But the impacts cannot be passed on to the shaft of the hydromotor because the driven flange and the adapter plate are no longer flush against one another but rather are situated at an axial distance from one another. In contrast to the known design, therefore, the hydromotor can be of lighter construction. Yet a substantially increased service life is attained for the hydromotor.

[0009] This bearing is advantageously performed in accordance with another embodiment in that a deep-groove ball bearing is provided between the exterior circumference of the housing and the interior circumference of the annular flange. Given the relatively large diameter of the housing and the annular flange that encircle the hydromotor, the deep-groove ball bearing can be very heavily stressed, even if the balls in the bearing are not very large.

[0010] Statically, it is particularly advantageous when the annular flange and the adapter plate are embodied as a single piece. However, cost-effective production is possible when the annular flange and the adapter plate are separate plates and are bolted together.

[0011] The axial extension of the entire device can be reduced when in accordance with another advantageous embodiment the driven flange is received in a depression on the inside of the adapter plate.

Problems solved by technology

But the impacts cannot be passed on to the shaft of the hydromotor because the driven flange and the adapter plate are no longer flush against one another but rather are situated at an axial distance from one another.

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