1. Mining DW single hydraulic props support use:
The externally-injected mining DW single hydraulic props support(hereinafter referred to as “this product”) is manufactured with high-quality materials and advanced processing equipment. All parts are strictly inspected, with reliable quality and excellent performance. This series of pillars are external hydraulic constant-resistance DW single hydraulic props support that can be used with various top beams or as main columns. It can be used for general mechanized coal mining or blasting working face support for coal mines, and can also be used for comprehensive mechanized coal mining face end support or other temporary support.
2. Mining DW single hydraulic props support:
1) This product is suitable for 0.55~3.5m coal seam mining height.
2) The gently inclined mining face with the coal seam inclination angle less than 25° can be extended to the inclined working face with the inclination angle of 25°~35° if certain safety measures are taken.
3) Coal seam top and bottom plate conditions:
1 The working resistance is 250KN. The anti-pressing strength of the bottom plate should be 20Mpa or more. The working resistance of the bottom plate should be more than 28Mpa. If the bottom plate is soft, the depth at which the struts are pressed into the bottom plate is limited to not deteriorate the integrity of the top plate and does not affect the recovery of the struts. Otherwise, measures such as “wearing shoes” or increasing the base should be taken.
2 The roof is better off, and the backwardness does not affect the recovery of the single hydraulic props support.
3 Safety measures should be taken when using in special cases (artificial false top working face or complicated geological structure, etc.).
4 When using the softer blasting working face, the protective surface of the outer surface of the living column should be protected to prevent collapse, and it should not be used as a single hydraulic prop support.
When the 5 pillars are used with the wooden top beam or used as a point column, the top cover should be replaced with a column cap to avoid damage to the wooden beam and cause difficulty in returning the column.
3. This DW single hydraulic props support should not be used on the working surface of the following conditions:
1) The hard-working blasting working face and the working surface with a particularly strong or impact pressure.
2) The working face height is too low (the pillar selection is incorrect), and the minimum height required for the safe recovery of the pillar after the roof sinks cannot be guaranteed.
3) Different working characteristics (such as friction struts, wooden struts, etc.) or pillars with different working resistance cannot be mixed in the same working surface.
4) It can be used for working face with periodic pressure, and it is generally not suitable for use with significant impact ground pressure.
