If you have enough understanding of the single hydraulic prop, then believe you unavoidably think that the single support equipment used in China is the single hydraulic prop, metal friction prop, piston type hydraulic prop (DZ type) three single support equipment. According to incomplete statistics, there are about 4-5 million supporting materials or equipment of various types needed in China, which is a huge industry. However, as far as the three existing monomer support materials or equipment are concerned, there are great or even very serious safety risks, which must arouse the attention and concern of all concerned.
As an ancient and simple support material, the single hydraulic prop has no initial support force, no constant increase in drag drop distance, and the support force cannot be guaranteed. Therefore, it may be a safety hazard of roof collapse accident at any time. Because it consumes a large amount of wood, it causes deforestation and serious ecological balance.
Metal friction support is a simple single support equipment developed in the 1960s. Compared with single hydraulic support, it can save a lot of wood and can also be reused. But its cannot assure constant increase drag drop distance, support force is subjected to temperature, humidity and the operator's artificial and other uncontrollable factors are many, the roof at any time there is the possibility of roof collapse casualty accident.
At present, the single hydraulic prop at home and abroad, because of the existence of internal leakage caused by the prop virtual roof, or even caused the prop automatic fall and injury accident hidden danger. All sealing points of DWX type single hydraulic prop are peripheral, which can be visually inspected. Once the prop leaks, the prop can be injected or replaced at any time, ensuring the safety and reliability of roof support of coal face.
The single hydraulic prop has no cylinder, no piston and no arc weld, which simplifies the structure of the prop and improves the safety. Its live column and cylinder are integral structure, the strength is big, the stability is good. Nickel - phosphorus - boron electroless plating surface treatment technology, anti - corrosion, wear - resistant and anti - gun collapse. The working medium of single hydraulic prop can adopt neutral water underground, which is environmental protection supporting equipment.
At present, the single hydraulic prop at home and abroad is to install the three valves of the cylinder welded on the live column, when the live column rises, the operator must rise with it, especially for the higher working face, the operator is very inconvenient and unsafe; And the single hydraulic prop three valve is set on the handle body, when filling liquid, three valve will not rise with the rise of the live column, easy to operate, safe and reliable. Each seal point uses seal compensation and seal tensioning technology, in the seal wear, can effectively compensate, in the roof to pressure, can still maintain tensioning state, reduce the replacement rate of seals, reduce maintenance costs.
