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Helpful application examples for mechanical engineers.
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IDEA NOTE Gears are used for opening and closing arms
Installed in a transfer line, the gear-driven opening/closing arm mechanism is used for escaping workpieces.
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Application Overview
Purpose
The opening/closing action of an arm, stopper, etc., is driven by gears.
Target workpiece
Shape: stepped resin (PVC) part
Size: D100 x H90mm
Weight: 0.4kg
Design Specifications
Operating Conditions or Design Requirements
Opening/closing arm oscillation angle: 25°
Arm open (close) operation time: 0.2sec
Operating pressure: 0.3Mpa
Cylinder stroke: 50mm
Piston speed: 250mm/sec
Conveyor speed: 100mm/sec
Distance workpiece moves in arm operation time: L = 100 x 0.2/1 = 20mm
Outer dimensions: W247 x D410 x H279mm
Required Performance
Load: 164N or less (30 workpieces)
Selection Criteria for Main Components
To satisfy the required load, a φ32 cylinder is selected.
Design Evaluation
Verification of main components
The cylinder thrust load and the strength of the arm are verified.
Selection of cylinder Workpiece mass: m = 0.4kg Number of workpieces: N = 30pieces Friction coefficient between workpiece and conveyor: μ = 0.7 Total workpiece weight: M = 0.5 x 30 = 12kg Load applied by workpiece: F1 = μ x M x 9.8 = 0.7 x 12 x 9.8 = 82N If we use 2 as the safety factor, F2 = 2 x F1 = 164N From cylinder thrust P = 207N, F2 < P
Confirmation of strength of arm that receives workpiece load. Arm width: b = 40mm Arm plate thickness: t = 4.5mm Arm length: L = 115mm Bending stress applied to arm: σ1 = 6 x F1 x L/bt2 = 6 x 82 x 115/40 x (4.5)2 = 70N/mm² Allowable bending stress of 1018 Carbon Steel: σ = 157N/mm² Therefore, σ1 < σ
Other Design Consideration
Space can be saved by installing the cylinder below the transfer surface.
The cover of the whole conveyor including the peripheral devices also serves as a safety cover for the drive section.
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