The invention discloses an experimental table propelling hydraulic
system of a hard rock boring
machine. The experimental table propelling hydraulic
system comprises an oil feeding pipeline, wherein one end of the oil feeding pipeline is communicated with an
oil tank; the other end of the oil feeding pipeline is sequentially connected with a filter, a constant delivery pump, a one-way valve and a stop valve; an oil outlet of the stop valve is connected with a first opening of a three-position four-way electro-hydraulic
servo valve; a fourth opening of the three-position four-way electro-hydraulic
servo valve is connected with inlets of first, second, third and fourth one-way proportional pressure reducing valves; each of oil outlets of the first, second, third and fourth one-way proportional pressure reducing valves is connected with a
pressure sensor and a rodless cavity of a propelling cylinder; rod cavities of four propelling cylinders are connected with a third opening of the three-position four-way electro-hydraulic
servo valve respectively; a displacement sensor is arranged in each of the four propelling cylinders; and a second opening of the three-position four-way electro-hydraulic servo valve is connected with the
oil tank. With the adoption of the
system, main beam constant-speed propelling can be realized, unbalance loading is restrained when the main beam is loaded in an unbalanced mode, and steering is matched when the main beam is steered.