A mine hydraulic prop with magnetic liquid seal

Abstract

The invention discloses a mining hydraulic prop for magnetic liquid sealing. The hydraulic prop is characterized in that a magnetic sealing part is arranged between a Y-shaped sealing ring (6) and the upper end of a handgrip body (18) and comprises a lower magnetic pole (14), a permanent magnet (15), an upper magnetic pole (16) and a magnetic separation ring (17); the upper magnetic pole and the lower magnetic pole are axially arranged along a plunger (12) up and down respectively; the upper magnetic pole, the lower magnetic pole and the plunger are in clearance fit; inner grooves are formed in the inner annular surface of the upper magnetic pole and the inner annular surface of the lower magnetic pole and filled with magnetic liquid (13); the permanent magnet is installed between the upper magnetic pole and the lower magnetic pole; the inner diameter and the outer diameter of the permanent magnet are the same as the inner diameter and the outer diameter of the upper magnetic pole and the inner diameter and the outer diameter of the lower magnetic pole; the magnetic separation ring is arranged between the permanent magnet and the handgrip body; a gland (10) is fixed to the handgrip body through a flat washer (8) and a bolt (9). The sealing performance of the hydraulic prop can be improved, and emulsion leakage caused by surface damage of the plunger is effectively avoided.

Description

technical field [0001] The invention relates to a mining hydraulic prop with magnetic liquid seal, which belongs to the technical field of working face supports. Background technique [0002] The suspended single hydraulic prop overcomes the shortcomings of the leakage and small support range of the piston single hydraulic prop currently used at home and abroad. It is suitable for the roof support and end roof support of the coal mining face. Its bearing capacity Large, strong anti-eccentric load capacity, large working stroke, and wide application range, so it can be applied to thin coal seams, medium-thick coal seams and thick coal seam working faces. The existing single hydraulic props are all sealed with Y-shaped sealing rings, but when the single hydraulic prop plays a supporting role in the blasting mining face, it is easily impacted by the slag caused by the blasting, which damages the coating on the live column surface of the prop and forms a pit The complex and har...

AI Technical Summary

Problems solved by technology

The existing single hydraulic props are all sealed with Y-shaped sealing rings, but when the single hydraulic prop plays a supporting role in the blasting mining face, it is easily impacted by the slag caused by the blasting, which damages the coating on the live column surface of the prop and forms a pit The complex and harsh environment in the underground will make the pits on the surface of the live column intensify and spread, which will cause leakage between the live column and the sealing structure, which will greatly reduce the pressure bearing capacity and high-pressure sealing performance of the hydraulic prop, and even cause casualty accidents.

[0003] In engineering practice, in order to improve the sealing performance of the hydraulic prop, the live post is often treated with coating strengthening treatment or an external sleeve is used to protect the surface of the live post, which increases the processing and manufacturing cost, but improves the sealing performance to a limited extent.

Images