Hydraulic support jack

φ63, φ80, φ100, φ110, φ125, φ140, φ160, φ180, φ200, φ210, φ220, φ230, φ250, φ280, φ300

The front beam jack is a key component in the hydraulic support (mechanical coal mining equipment). It is mainly used to support and control the lifting and lowering of the front beam of the hydraulic support to adapt to changes in the roof of the coal mining face and ensure safe production.

Working principle

Lifting column (front beam swings up): The hydraulic system supplies fluid to the lower chamber of the jack. The high-pressure oil pushes the piston to drive the piston rod to extend, and the front beam swings upward to support the top plate.

Column lowering (front beam lowering): The hydraulic system supplies fluid to the upper chamber, the piston rod retracts, and the front beam swings downward to release the pressure on the top plate (such as the rack lowering action before moving the rack).

Pressure-maintaining state: Lock the oil circuit through a hydraulic lock (one-way valve or two-way lock) to keep the front beam at the designated position to prevent the front beam from automatically lifting due to top plate pressure fluctuations.

Core functions

Support and adjust front beam

Push up the front beam to make it close to the roof and bear the initial support load of the roof (such as partial support of the broken roof).

When shrinking downward, the front beam can be drooped, making it easier to move the bracket or adapt to the sinking of the roof.

Coping with complex roof conditions

When the roof undulates, breaks, or sinks in steps, the angle of the front beam can be adjusted to improve the support effect of the bracket on the roof and prevent leakage and chipping.

Coordinated main roof beam support

Cooperating with the main top beam jacks (columns), a "multi-level support" system is formed: the front beam jacks are responsible for partial support of the front end, and the main columns bear the main load to improve the overall stability of the bracket.