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Travel Mechanism
The cylinder stroke can be doubled by utilizing a rack and pinion mechanism.
Operation
The cylinder drives the spur gear along the fixed rack. The spur gear also propels the moving gear forward to extend the stroke.
Target workpiece
Shape: Block
Material: Tungsten
Workpiece size: 50 x 50 x 100mm
Design Specifications
Operating Conditions or Design Requirements
Cylinder outstroke: 50mm
Travel of the moving rack: 100mm
External dimension: L340 x W132 x H94mm
Required Performance
Load: 48N
Selection Criteria for Main Components
Select wear resistant materials for the racks and pinion.
Verification of main components
Validate the cylinder output
Condition values.
Where the cylinder inner diameter is 20 mm, the plant air pressure=0.5MPa
Cylinder thrust (outstroke): 157N
Cylinder thrust (instroke): 132N
Mass of workpiece (M₁): 4.8kg , mass of worktable (M₂): 1.17kg
Friction coefficient of linear guide (μ): 0.005, gravitational acceleration (g): 9.8m/s²
Cylinder stroke (sｔ₁): 50mm
Rack travel (sｔ₂): 100mm
Required cylinder thrust: Fc.
Load applied by the workpiece: F₁
Law of conservation of work load .
Assuming that the work loads of the cylinder and the rack are equivalent,
Fc×st₁=F₁×st₂
Fc=F₁×st₂/st₁
the load applied by the workpiece, F₁, is
F F₁=(M₁+M₂)×g×μ=(4.8+1.17)×9.8×0.005=0.29N
In consequence, the required cylinder thrust, Fc, is
Fc=0.29×0.1/0.05 (Fc=0.58N)
Conclusion.
Cylinder thrust (instroke): 132N>>0.58N For the expressions described above, it can be concluded that the thrust is sufficient.
I would like to hear what you think...suggestions and comments are welcome!
Thank you!
Link to download free 3D models
http://zipansion.com/Ospp
http://zipansion.com/OsrE
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