Low-position coal-caving hydraulic bracket

Abstract

The invention discloses a low-position coal-caving hydraulic bracket, which is also called as a two-stage telescopic plugboard type coal-caving hydraulic bracket. The low-position coal-caving hydraulic bracket comprises a top beam 1, a vertical column, a base, a covering beam 2, a four-link mechanism and a coal-caving mechanism and the like, wherein the coal-caving mechanism consists of a tail beam and plugboards; the coal-caving mechanism is a two-stage telescopic plugboard type coal-caving mechanism consisting of the tail beam 3, a first-stage plugboard 4, a second-stage plugboard 5 and a double-telescopic jack 6; the first-stage plugboard is embedded in a sliding channel in a tail beam body; the second-stage plugboard is embedded in a sliding channel in the first-stage plugboard; and the double-telescopic jack is hinged between the tail beam and the second-stage plugboard. The double-telescopic jack is controlled to push the two-stage plugboards to expand and retract so as to close or open a coal-caving opening. The bracket is used for an integrated work surface of a coal mine, and by utilization of the characteristic that the telescopic travel of the two-stage telescopic plugboard type coal-caving mechanism is large, the adaptability of the bracket to the change of the supporting height can be improved; and under the condition of maintaining the length of the shorter plugboard, the covering range of the tail beam and the plugboards in high-position supporting is increased, the contact of the plugboards with a rear conveyer can be avoided when the supporting height is less, and simultaneously, the matching of the rear conveyer is convenient.

Description

technical field [0001] The invention relates to a fully mechanized coal mining top coal caving hydraulic support, in particular to a low-position top coal caving hydraulic support with strong adaptability to the support height of the support and a large telescopic stroke of a coal caving mechanism. Background technique [0002] At present, the coal-caving mechanism of the two-column low-position top-coal caving support used in the fully mechanized caving face of the coal mine adopts a single-stage retractable plate structure. The low-level top-coal caving support adopting this kind of coal caving mechanism, especially when the support height of the two-column low-level top-coal caving support with large mining height is high, it is easy to cause the tail beam inserting plate to be fully extended and cannot fully protect the rear. The problem of the scraper conveyor caused a large amount of gangue to be released and poured into the rear scraper conveyor, affecting normal prod...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the disadvantage that the existing low-level top-coal caving hydraulic support adopts a single-stage telescopic inserting plate coal-caving mechanism that cannot well adapt to the fully-mechanized caving face with large changes in support height, the present invention provides a low-level top-coal caving hydraulic support. The telescopic stroke of the plate is large, and the cover range of the coal caving mechanism is large, which can well adapt to the fully mechanized caving face with large changes in support height

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