DEVICE FOR CONTROL OF HOISTING AND DIGGING MECHANISMS Russian patent published in 1999 - IPC

FIELD: control system for load-handling and excavating machinery. SUBSTANCE: device particularly relates to pneumatic control systems of excavators and cranes operating at subzero temperatures. Control device has air compressor, oil-moisture separator, and receiver. They are successively interconnected by pneumatic lines. Receiver outlet is pneumatically connected to inlets of adsorbers with uniformly located thermoregulating heaters. Outlets of adsorbers are pneumatically connected to consumer. Device is additionally provided with housing which is fastened on inlet pipe union of compressor. Housing is made in the form of resonator with inlet hole. Used in function of inlet hole is narrowing nozzle operating as neck of resonator. Movably fastened inside housing before outlet bore of narrowing nozzle is corrugated vessel. Control unit is connected to temperature sensor and inlet bore of narrowing nozzle. Pressure sensor is connected to outlet of adsorbers. Control unit operates valves which pneumatically connect corrugated vessel with atmosphere and with outlet from absorbers. Application of aforesaid control device ensures increase of compressor output due to utilization of gas-dynamic supercharging in specific conditions of operating hoisting and digging mechanisms. EFFECT: higher efficiency. 2 dwg