Introduction to Pneumatics/Hydraulics Advance Machining Technology I PDT211
Air Production System Air Consumption System
What can Pneumatics do? • Operation of system valves for air, water or chemicals • Operation of heavy or hot doors • Unloading of hoppers in building, steel making, mining and chemical industries • Ramming and tamping in concrete and asphalt laying • Lifting and moving in slab molding machines • Crop spraying and operation of other tractor equipment • Spray painting • Holding and moving in wood working and furniture making • Holding in jigs and fixtures in assembly machinery and machine tools • Holding for gluing, heat sealing or welding plastics • Holding for brazing or welding • Forming operations of bending, drawing and flattening • Spot welding machines • Riveting • Operation of guillotine blades • Bottling and filling machines • Wood working machinery drives and feeds • Test rigs • Machine tool, work or tool feeding • Component and material conveyor transfer • Pneumatic robots • Auto gauging • Air separation and vacuum lifting of thin sheets • Dental drills
Advantage of Pneumatic System • Availability • Storage • Simplicity of design and control • Choice of movement • Economic • Reliability • Resistance to Environment • Environmentally clean. • Safety
Directional Control Valves • Change direction of air flow.
Functional Types of Directional Control Valves • 2/2 valve • 3/2 valve • 4/2 valve • 5/2 valve • 5/3 valve What is 2/2 valve??? 2 way – 2 position Valve
Schematic Symbols Position Boxes 2 position 3 position
Schematic Symbols Valve Port 2 port -2 position 3 port -2 position
Functional Types of Directional Control Valves 2 way – 2 position Valve
Functional Types of Directional Control Valves 3 way – 2 position Valve
Schematic Symbols Types of Cylinder Single Acting Cylinder Spring Return Cylinder Double Acting Cylinder
Schematic Symbols Actuator
Actuation system Pilot operated valves High force required to control a valve One valve is used to control a second valve
Problem 1 Part has to be clamped before milling process. Technician needs to activate the pneumatic clamps before starting the milling and deactivate the pneumatic clamps after finishing the milling process. Design a pneumatic circuit that open and close the clamp to ensure part is fixed for milling process. 1-4/2 valve 2-Manually operated actuator 3-Double acting cylinder
Problem 2 A large stamping press must have a part in place, the clamps engaged and the safety guard closed before the press can operate. The pneumatic circuit needed for this type of machine is designed to minimize potential safety hazards.