Efficient and high-safety hydraulic prop for coal mining

Abstract

The invention discloses an efficient and high-safety hydraulic prop for coal mining, the upper end part of a cylinder barrel is fixedly connected with a first sealing body, and the upper end of the first sealing body is connected with a second sealing body in a pressing and sealing manner. The first compressing sealing body compresses the first sealing ring, and the second compressing sealing bodycompresses the second sealing ring, so that the second sealing body and the outer wall of the movable column body are sealed. A first decontamination device is arranged between the second pressing sealing body and the second sealing ring, an oil inlet hole and an oil outlet hole are formed in the first decontamination device in a penetrating mode, and the oil inlet hole and the oil outlet hole are formed in the two sides of the plunger body. The upper end of the second pressing sealing body is detachably connected with a second decontamination device. The efficient and high-safety hydraulic prop for coal mining is reasonable in sealing structure design, and the single supply and use duration of the hydraulic prop is prolonged. In the recovery process of the hydraulic prop, the hydraulic prop can be decontaminated. Recycling construction standards are formed, construction consistency is improved, and the service life of the hydraulic prop is guaranteed.

Description

technical field [0001] The invention relates to the technical field of structural design of hydraulic props used in coal mine support equipment, in particular to a high-efficiency and high-safety hydraulic prop used in coal mine excavation. Background technique [0002] The main part of the existing single hydraulic prop is composed of a cylinder, a live cylinder and a return spring arranged in the live cylinder. During work, the hydraulic oil needs to fill the inside of the entire live cylinder and jack up the live cylinder. The single hydraulic prop is often used for the roof support and end roof support of the coal mining face. Therefore, the sealing performance of the living cylinder is extremely high, so as to meet the requirements of construction strength. [0003] The existing plunger mining single hydraulic prop adopts plunger technology, and the high-pressure sealing surface is arranged on the outer surface structure of the living cylinder, and the living cylinder...

AI Technical Summary

Problems solved by technology

The existing single hydraulic prop is chrome-plated or chemically plated on the outer surface of the live post. This method can increase the hardness of the outer surface of the live post to a certain extent and improve the performance of the live post, but the coating is easy to fall off

Moreover, during the recovery process of the live cylinder, it is easy to bring the dirt attached to its surface into the sealing structure, which seriously damages the sealing structure and leads to the failure of the entire usable life cycle of the hydraulic prop.

[0004] It can be seen that in the prior art, during the recovery process of hydraulic props, the live cylinders cannot be cleaned and can only be completed by simple cleaning by workers, which will easily cause dirt to enter the inside of the sealing structure, affecting the service life of the sealing structure, and further Reduced service life of the entire hydraulic strut

Furthermore, in the prior art, the design of the sealing structure is unreasonable, and the sealing performance cannot be adjusted. In the long-term use process, the repair rate of the hydraulic prop is high, which seriously increases the construction strength and delays the construction efficiency.

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