Non-joint single hydraulic prop for blasting mining

Abstract

The invention discloses a non-joint single hydraulic prop for blasting mining, and aims at solving the problems such as short travel, high minimum height, easy breaking and a plurality of processing processes of the existing device. The non-joint single hydraulic prop for blasting mining is characterized in that a movable prop body is a complete hollow barrel shaped body; the bottom end is in soft connection with a hollow piston body; a sealing block is mounted in the top end of the movable prop body, and a top cover is mounted at the outer part of the top end; the piston body is mounted in the base; a D-shaped sealing ring I and a guide ring are mounted between the piston body and an oil cylinder; the lower part of the oil cylinder is completely sealed through the base; the base is connected with the oil cylinder through a connecting steel wire I; a three-purpose valve seat is firmly welded on the outer wall of the movable prop body on the lower surface of the top cover. The non-joint single hydraulic prop for blasting mining is large in travel and small in minimum height; the movable prop is of a complete movable prop structure, so that the possibility of a joint, a prop head, a weld joint and breaking can be avoided; the load-deflection resistance is high; the base is in a form of a coated base, so that the bottom part of the oil cylinder is greatly protected; the prop can be quickly returned, and thus the safety is improved; the processing process is simple, and few materials are used; the piston body is of a dirt storage form and can be used for storing coal dust and other impurities entering the movable prop.

Description

technical field [0001] The invention relates to a hydraulic prop, in particular to a single hydraulic prop used in coal mine blasting coal mining face. Background technique [0002] At present, the DZ single hydraulic prop for mining has been used in coal mines for 36 years since it was introduced from abroad in 1978, and it has played an important role in the development of my country's coal industry and in saving wood. Because this type of pillar is suitable for blast mining coal mining face, its biggest advantage is that the outer surface of the live pillar is not afraid of blasting and bumping. Therefore, this type of product is still used in major coal mines across the country. [0003] However, during the use of this type of pillar for more than 30 years, its fatal shortcomings have been exposed as follows: [0004] 1. The stroke is short and the minimum height is high. For example, the DZ25 pillar has a stroke of 800mm and a minimum height of 1700mm; the DZ35 pillar...

AI Technical Summary

Problems solved by technology

For example, the DZ25 pillar has a stroke of 800mm and a minimum height of 1700mm; the DZ35 pillar has a stroke of 800mm and a minimum height of 2700mm; and it is very heavy, and it is difficult to carry, transport and support operations, so it is not suitable for the support of the working face with large changes in the mining height of the coal seam. , which also makes the coal mine reserves have more pillar specifications, which increases the cost of coal mining

[0005] 2. There are many welds, easy to break, and poor safety performance

[0006] 3. Poor load resistance

And because the concentricity of the welded extension section is poor, when the eccentric load force and side thrust force are slightly larger, the live column and the extension section will be bent and deformed, causing the support column to be unusable.

[0007] 4. The form of the built-in base is also one of the shortcomings of this type of pillar

Practice has proved that the bottom of the oil tank has no external protection. Under the action of force, the bottom of the oil tank forms a bell mouth and causes liquid leakage. Most cracks and frying tanks start from the steel wire smashing into the gap. Therefore, the form of the built-in base is also The biggest disadvantage of this type of pillar

[0008] 5. The process is complicated, more equipment is invested, more processing procedures are used, more molds are used, and more materials are wasted

(2) The column head processing process is complex, and its process route is sawing-drilling-processing of φ42 waist holes at both ends of the lathe-drilling-welding hook-electroplating-two welding with the live column and the extension section

(3) The mold used for machining the base hole of the oil cylinder has a large volume and high precision requirements, and it is difficult to ensure the coaxiality of the base hole and the cylinder hole during processing

(5) The rough weight of a stigma is 8.8kg. When the φ42 waist hole of the stigma is deformed and corroded, all the 8.8kg steel will be scrapped, so the waste is large

All this, increasing the cost of the pillar and wasting steel

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