抄録
In the design of a hydraulic breaker, it is necessary to take the properties of blowed materials into consideration because the properties have infuluence on the performance of hydraulic breakers. In order to clarify the effect of the materials-properties, an experiment has been organized for evaluating the performance of a breaker. In the experiment, three kinds of hard rubbers have been used for simulating the properties of materials which are broken by breaker.
The following results have been obtained.
(1) The rate of the energy-absorptive-power for the materials, which is calculated from the blow velocity and the repel velocity of the piston, increases linearly as the supply flow rate and the tate of the supply-flow-energy are increasing.
(2) As the rate of energy-absorptive-power is increasing, the blow velocity of the piston increases. but the efficiency of the oil hydraulic breaker decreases.
(3) The blow rate increases as the rate of the energy-absorptive- power is increasing. The harder the blowed rubber becomes, the more the blow rate increases. Under the constant supply pressure, the blow rate decreases as the hardness of the blowed rubber is decreasing.
