Design of New-type Impactor Based on Combined Effect by Air-pressure and Electromagnetism

Analysis ofrock-breaking mechanism of cyclical impact loading under high and low impact on the basis of impact stress wave theory holds that microcrack occurs in the rock due to high energy impact and the following medium and low impact can cause rapid destruction of the rock. Intermittent impact method of variable impact energy is hence suggested. Electromagnetically-propelled device is added to the traditional air hammer by means of intermittent intervention by electromagnetic impact.Combined impact by gas and power and interval pneumatic impact is applied to design new-type impactor based on the combined effect by air-pressure and electromagnetism, which is supposed to provide a new solution for improvement of impactor work efficiency.

Simulation in design air spindle with orifice and distribution grooves

This paper presents some results of simulation using ANSYS CFX software in design air spindle which has the structure in the form of orifice and grooves to ensure uniform pressure distribution and avoiding air hammer; it is also easy to manufacture and reduces costs. The results of simulation are good in investigating operation of air-spindle which is changed some parameters to find the optimal working mode for the air spindle with speed in the range of 5000–20,000 rpm.