In the selection of hydraulic support, the purpose is to make the conditions of fully mechanized equipment is suitable for mines and work face, investment of production after can do safety, high yield and high efficiency, and to the concentration of mine production, the best economic benefit and optimize management provides favorable conditions, all must according to the geology and coal seam, choice of equipment and technical conditions.
1. The selection of hydraulic support scaffolding must first choose the appropriate and roof, generally can be directly selected according to the level of the roof frame.
2. When the thickness of the coal seam is more than 2.5 meters, when the right side of the roof receaves and horizontal thrust, the support with strong torsional resistance should be selected, which is generally not suitable for the support type.
3. When the thickness of the coal seam is from 2.5 to 2.8 meters, it is necessary to choose the support shield support and shield support with mutual help device. When the thickness of the coal seam becomes larger, it is necessary to choose the shield support with larger elevation range, mechanical extension rod or expansion force.
4. The contact specific pressure of the support to the bottom plate should be less than the allowable compressive strength of the bottom plate. Under the condition that the bottom plate is relatively soft, the support of the bottom plate lifting device should be adopted to protect the support, which is a leg-inserted shield support.
5. When the dip Angle of the coal seam is less than 10 degrees, the hydraulic support can not be equipped with anti-skid device. When the dip Angle is more than 10 to 15 degrees, the hydraulic support with anti-skid device should be selected; when the dip Angle is more than 18 degrees, the hydraulic support with anti-skid device should be selected.
6. If the work is full of large gas emission, it should comply with the requirements of "coal mine safety regulations", and give priority to the support type or support type hydraulic support with large ventilation area.
7. When the coal seam is soft, the maximum height of the support is generally less than 2.5 meters; when the medium hard coal is, the maximum height of the support is less than 3.5 meters; when the hard coal is, the maximum height of the support is less than 5 meters.
8. At the same time, it is allowed to choose the centralized frame, the relatively cheap support should be preferred, the support type hydraulic support is the cheapest, and then in the cover type hydraulic support, the most expensive is the support cover type hydraulic support.
