| 摘要 |
An apparatus for testing for air and water leakage in jack legs and air dril ls used to bore holes in rock and ore has an upright beam supporting a weight vertically movable with expansion of the jack leg. A test stand has a plurality of valves operable to divert a ir to the jack leg and air drill. Gauges on the test stand monitor the air pressure in the jack leg and air and water pressures in the air drill to provide information as to air and water leakage and defective parts in the jack leg and air drill.
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