The single hydraulic prop is one of the necessary equipments for underground support in coal mine. Individual hydraulic prop design sealing parts need plating, a qualified individual hydraulic prop several parts related to seal, as long as one of the components of coating damage, high sealing system was destroyed, resulting in individual hydraulic prop seal failure, it shortens the time of use in mine and increase the amount of repair, more important is the serious influence to the safety of the mine support. Therefore, it is of great significance to prevent and repair damage of monomer hydraulic until coating.
To prevent coating damage from mechanical damage and corrosion damage from two aspects.
Preventing mechanical damage to the coating includes four points:
• use flexible material separation during loading, unloading and transportation to prevent damage to the plating of props.
• prevent repair damage. During the repair process, the spare parts must be stored at fixed points and treated with anti-corrosion. Parts with high machining accuracy, high requirements for rough grooves and good surface coating quality must be stored separately and independently to prevent mechanical knock damage to parts coating.
• prevent plating damage of support and return columns. When the effective stroke of the single hydraulic prop reaches the safe height of the return column, measures should be taken in time to prevent "dead column". When the single hydraulic prop pressed into a "dead column" must first play temporary prop, and then take the method of lifting or undercover retreat, can not use gun collapse or mechanical power equipment and other forced column, to prevent damage to the plating of the prop.
• additional protection measures for the gun face. It is one of the important protective measures to use single hydraulic prop and set reasonable Angle and depth of perforation. In order to prevent the prop from being damaged by gangue or coal when shooting, a reliable screen must be hung.
To prevent coating corrosion damage group to pay attention to the following two points:
• strengthen coating quality testing of newly purchased props and parts.
• configure qualified emulsion.
The repair of coating damage depends on the type of single hydraulic prop and there are different processes: DZ single hydraulic prop adopts hydraulic cylinder insert technology update technology and live column powder spraying technology; Prop type DWX suspension coating damage after two fix - one is a living directly from the manufacturer to purchase a new column for replacement, the high cost of the scheme, feasibility is small, the other is to put it into prop DZ type, type using the DWX suspension props of live column of hydraulic cylinder can also be used with updated technology, to increase piston, stigma, solve the DWX prop live column type coating corrosion damage and repair of mechanical damage.
