Hydraulic support jack

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

The telescopic beam jack is a key execution component in the hydraulic support (coal mine fully mechanized mining equipment) used to control the telescopic action of the telescopic beam (forward extension beam). Its main function is to push the telescopic beam to extend forward or retract backward to achieve advance support or retraction of the roof in front of the coal wall of the coal mining face.

Working principle

Extending action: The hydraulic system supplies fluid to the jack piston rod cavity (front cavity), and the high-pressure oil pushes the piston rod to extend forward, driving the telescopic beam to move forward along the slideway (or guide rail) at the front end of the top beam until it reaches the stroke.

Retraction action: The hydraulic system supplies fluid to the jack cylinder cavity (rear cavity), the piston rod retracts, and the telescopic beam returns to the initial position.

Pressure locking: Lock the oil circuit through a hydraulic lock (one-way valve or two-way lock) to keep the telescopic beam in the designated position to prevent it from retracting due to roof pressure or vibration.

Core functions

Advanced support

When the shearer cuts the coal, the roof in front of the coal wall is exposed. The telescopic beam jack pushes the telescopic beam forward (the extension length is usually 0.5-1.5 meters) to support the newly exposed roof in advance to prevent roof collapse or fragmentation.

It is suitable for working conditions such as broken roofs and fault zones that require "timely support".

Move the shelf to avoid

Before the bracket is moved, the telescopic beam jack is retracted, driving the telescopic beam back below the top beam to reduce the movement resistance of the bracket (to avoid friction between the telescopic beam and the coal wall).

After the frame movement is completed, the telescopic beams are extended again to restore support to the roof.

Adjust support range

By controlling the extension length of the telescopic beam, the support distance at the front end of the bracket can be flexibly adjusted to adapt to different mining heights (coal seam thickness) or roof undulation conditions.