Electricity for Refrigeration, Heating, and Air Conditioning
Electricity for Refrigeration, Heating, and Air Conditioning
9th Edition
ISBN: 9781285179988
Author: Russell E. Smith
Publisher: Cengage Learning
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Chapter 5, Problem 5RQ
To determine

The major difference between a contactor and a relay.

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The machine below forms metal plates through the application of force.  Two toggles (ABC and DEF) transfer forces from the central hydraulic cylinder (H) to the plates that will be formed.  The toggles then push bar G to the right, which then presses a plate (p) into the cavity, thus shaping it.  In this case, the plate becomes a section of a sphere.  If the hydraulic cylinder can produce a maximum force of F = 10 kN, then what is the maximum P value (i.e. Pmax) that can be applied to the plate when θ = 35°?  Also, what are the compressive forces in the toggle rods in that situation?  Finally, what happens to Pmax and the forces in the rods as θ decreases in magnitude?
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Electricity for Refrigeration, Heating, and Air Conditioning

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