Large working resistance leading hydraulic bracket for return airway

Abstract

The invention discloses a large working resistance leading hydraulic bracket for a return airway. The bracket comprises two supporting units arranged side by side at intervals, the two supporting units have the same structure and each supporting unit is composed of a front bracket and a rear bracket which are arranged in the longitudinal direction; the front brackets and the rear brackets are hinged by pushing jacks; the front brackets and the rear brackets have the same structure and each is composed of a top beam, a shield beam, a four-link mechanism, a base, a telescopic upright post, an inner bottom adjusting jack and an outer bottom adjusting jack; the inner side of each base is provided with a box-shaped pedal channel in the longitudinal direction, the inner bottom adjusting jacks are arranged in the box-shaped pedal channels in the transverse direction, and the outer bottom adjusting jacks are arranged in the bases in the transverse direction; and the outer sides of the top beams are hinged with upper gangue blocking plates downwards, the outer sides of the bases are hinged with lower gangue blocking plates upwards, and the upper gangue blocking plates and the lower gangue blocking plates are overlapped with each other. The large working resistance leading hydraulic bracket has the advantages that large working resistance and supporting strength can be realized, a safe space for pedestrians and transportation of materials is reserved, and the normal production advancement of the fully mechanized working face can be ensured.

Description

technical field [0001] The invention relates to a leading hydraulic support for a return airway in a fully mechanized mining face, in particular to a large working resistance leading hydraulic support for a return airway. Background technique [0002] The underground tunnel roadway is an important material transportation and underground ventilation channel in the modern fully mechanized mining face. Due to complex underground geological conditions, it is difficult to accurately measure and calculate the stress distribution of rock formations, resulting in the deformation of the roof of the roadway, the inward shrinkage and extrusion of the two sides of the roadway, the intrusion 14, and the phenomenon of bottom drum 15 (such as Figure 6 As shown), it directly affects the safety of personnel and equipment, so the support of the tunnel roadway is very important. In order to solve the above roadway support problems, advanced hydraulic supports are currently used for mechanized...

AI Technical Summary

Problems solved by technology

[0003] In recent years, in the production practice of coal mines where roadway floor heaving is prone to occur, the roof of the roadway within the range of 30-50m ahead of the working face, under the original support conditions of anchor rods and cables, is supported by advanced brackets, and the roof can basically be maintained, but There are still the following problems: 1. Low support strength: the existing roadway supports generally use 230mm to 320mm columns, and the support strength is generally ≤1.2MPa calculated according to the area where the top beam of the roadway support contacts the roadway roof. Based on the calculation of the full section (supported roadway length × roadway width), the support strength of the existing advanced support is difficult to exceed 1Mpa; 2. Insufficient equipment safety: the extrusion of the two sides of the roadway will cause the extrusion support equipment to Damage to the column; 3. The occurrence of the bottom drum cannot be effectively prevented: where the base of the advanced bracket cannot cover, the occurrence of the bottom drum is greatly increased; 4. The personnel passage area and ventilation space cannot be guaranteed: the severe protrusion of the bottom drum can reach If it is more than 1 meter, it will cause the pedestrian passage and ventilation space to be compressed or even lost; 5. The capacity of the equipment is limited: once the bottom drum occurs, the gangue surging from the floor of the roadway will immediately cause the advanced support to be unable to move forward, which greatly affects the normal production. advance

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