Sizing Industrial Shock Absorbers for Cylinder-Driven
Vertical Rotating Arm (Pull Type) with Gravity-Aided Load
In vertical rotating systems where a hydraulic or pneumatic cylinder (pull type) lowers an arm and the motion is aided by gravity, the load accelerates quickly and produces significant kinetic energy that must be absorbed safely. At Shockbuffer, we provide precise industrial shock absorber selection and professional sizing of shock absorbers for these combined cylinder-driven and gravity-assisted applications. Our medium industrial shock absorbers are specifically engineered to handle the dynamic forces generated by downward rotation under pull force and gravity, delivering smooth deceleration, protecting equipment, and reducing vibration. Using the correct shock absorber for machinery ensures safer, quieter, and more reliable operation.
Formulae
I = W · K²
T = ((0.78 ·D ) - (0.78 ·DR ))·p· Rc
F = (T + (W · K · sin α) )/ Rs
E1 = 0.5 · I · ω²
E2 = F · S
E3 = E1 + E2
E4 = E3 · c
Vs = Rs · ω
We = (2 · E3) / Vs
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Example: Sizing Industrial Shock Absorbers for Cylinder-Driven Vertical Rotating Arm (Pull Type) with Gravity-Aided Load
D = 0.060 m
DR(Rod Dia.) = 0.0254 m
p = 550000 Pa
Rc = 0.4 m
W = 110 kg
K = 0.7 m
Rs = 0.6 m
ω = 3 rad./sec
α = 45°
s = 0.050 m
c = 100 / hr
I = 110 · 0.7 = 54 kg-m
T =((0.78 · 0.060 )-(0.78 · 0.0254 ))· 5.5 · 105· 0.4 = 507 N
F = (507 + ( 110 · 0.7 · 0.7 )) / 0.6 = 934 N
E1 = 0.5 · 54 · 3 = 243 Nm
E2 = 934 · 0.050 = 47 Nm
E3 = 243 + 47 = 290 Nm
E4 = 290 · 100 = 29000 Nm/hr
VS = 0.6 · 3 = 1.8 m/s
We = (2 · 290) / 1.8 = 179 kg
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Application of Industrial Shock Absorbers
Typical shock absorber applications in this category include:
Pull-type cylinder systems lowering heavy tools or parts into position
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Vertical rotating arms in assembly lines, moving parts down to workstations
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Automated fixtures tilting downward under gravity, controlled by a cylinder
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Material handling arms transferring loads from elevated conveyors to lower levels
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Gravity-assisted pivoting platforms rotating panels or products into assembly areas
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Packaging machinery where large frames or gates rotate downward with cylinder pull
In each case, a medium industrial shock absorber must be sized accurately to absorb the combined kinetic energy of the pull force and gravity, ensuring controlled, gentle stops and protecting machinery from excessive shock and mechanical wear.
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