KRATZER CRANE Russian patent published in 2021 - IPC B65G65/28 

FIELD: transportation.

SUBSTANCE: kratzer crane contains an undercarriage, a rotating platform with a boom with a scraper chain and an elevator with an unloading chute, a platform rotation mechanism, a winch with a chain hoist system. At the same time, the platform rotation mechanism includes a slewing ring, consisting of horizontally located upper, lower and support rings, forming between themselves two pairs of raceways in which steel balls are located, connected by separators, with the possibility of rotation of rigidly connected upper and lower rings relatively to the support ring. At the same time, the rotation platform is rigidly fixed on the upper ring, and the support ring is rigidly fixed along its outer edge between the horizontally located upper and lower flanges along their inner edges, between which the pins are vertically fixed along their outer edge, forming a stinging engagement with a horizontally located gear wheel of the rotation platform. The bottom flange is rigidly fixed to the support ring of the undercarriage. At the same time, rotary sensors are installed on the boom to control the depth of immersion of the boom scrapers in bulk material, and an unloading chute is made in the center of the undercarriage, tapering to the bottom, in the upper part of which the lower part of the elevator unloading chute is located with a gap.

EFFECT: invention provides reliability and manufacturability of the platform rotation mechanism, as well as the ability to control objectively the immersion level of the boom with a scraper chain in bulk material.

2 cl, 6 dwg