High-Cycle Shock Absorbers for Warehouse Sortation Systems
How to assess repeated deceleration in sorter diverts, pop-up transfers and automated distribution-center stops.
Direct answer
Warehouse sortation equipment needs more than a single-impact check. Use the heaviest carrier or tote condition, the highest contact speed and the peak events per hour for the specific divert or transfer. Confirm that the absorber can dissipate the resulting hourly energy, reset before the next event and remain aligned as guides, belts and actuators cycle repeatedly.
Questions this page answers
- How do I choose a shock absorber for a sorter divert?
- What causes shock absorbers to overheat in warehouse automation?
- How should cycle rate be checked for transfer and sortation stops?
Required inputs
Formula logic
Hourly energy load
The per-event energy is only the starting point. Peak sortation duty determines the thermal load that must remain within the absorber's energy-per-hour rating.
ETC = E x (impacts per hour)Unit: N m/h
Review steps
- 1
Recognize the problem and its limits
After a speed or throughput increase, the absorber becomes hot, loses damping or bottoms out. Check energy per impact AND energy per hour, return time, alignment and cooling. Temperature alone does not establish the cause; compare measured conditions with model limits.
- 2
Collect the operating data
Weigh the complete moving assembly. Obtain speed at first contact from a trace or a safely recorded movement, rather than using the machine’s nominal speed. Count impacts at this individual stop during peak production. Measure usable travel and record whether a belt, queued pallets or an actuator keep pushing. Mark estimates and unknowns; send photos or a drawing when measurements are unavailable.
- 3
Worked engineering example — not a customer case
Assume one absorber stops a horizontal 50 kg load at 1 m/s, with no drive force during compression and 30 impacts/minute. Energy per impact = 0.5 × 50 × 1² = 25 J. Cycle rate = 30 × 60 = 1,800/h. Hourly energy = 25 × 1,800 = 45,000 J/h. These are assumed demonstration inputs, not your machine’s results.
- 4
Why one model is excluded
EK20x12 is listed at 31 J/cycle and 35,200 J/h. The 25 J impact is below its single-impact rating, but 45,000 J/h exceeds its hourly rating, so exclude it for this assumed continuous duty. A passing single-impact check cannot cancel a failed thermal-duty check.
- 5
What may enter the shortlist
EK25x25 is listed at 81 J/cycle, 77,000 J/h and 25 mm stroke. It passes only the two energy checks in this example and can enter further review if the mechanism accommodates its working stroke and mounting dimensions. This is not approval for installation.
- 6
Validate before ordering
Confirm effective mass and velocity range, peak transmitted force, allowable structural load, adjustment, full return before the next impact, alignment and thermal conditions. Record initial and stabilized temperature, cycle rate, stroke use and observed rebound during a controlled trial. Define acceptance limits with the machine designer; missing model limits require engineering confirmation.
Common mistakes
- Using average throughput instead of peak events per hour.
- Checking only the tote mass and omitting the carrier or moving divert hardware.
- Treating an increase in stop noise as normal wear instead of reviewing heat, alignment and available stroke.
Technical notes
- Illustrative calculation; EK20x12 and EK25x25 ratings checked against published EKD model records on 4 October 2026. J and Nm are equivalent energy units. Catalog ratings do not establish service life or application suitability.
Move from answer to model shortlist.
Use the sizing tool when you have the inputs, or send the application data for engineering review.