Overload Risks of Pads in Vertical Jacks
Pads in vertical jacks serve a critical role in distributing loads, providing stability, and ensuring safe lifting operations. Operating beyond their rated capacity can pose serious risks to both equipment and personnel.
1. Causes of Overload Risk
Exceeding Rated Capacity: Using the jack or pad beyond its design load increases stress on the pad material.
Improper Load Distribution: Uneven positioning of the load can concentrate stress on a smaller area, effectively overloading the pad.
Material Degradation: Aging, wear, or environmental damage reduces the load-bearing capability, making pads more susceptible to overload.
Incorrect Pad Selection: Using pads not designed for the specific jack model or load type can lead to overstressing.
2. Consequences of Pad Overload
Permanent Deformation: Excessive load can compress the pad beyond its elastic limit, causing permanent shape changes.
Cracking or Rupture: Overstressed pads may crack, split, or delaminate from the metal base.
Instability and Slippage: Overloaded pads may fail to maintain proper contact with the load, leading to tilting or slipping.
Equipment Damage: Overload can damage both the pad and the jack components, reducing overall service life.
Safety Hazards: Sudden pad failure under load can cause accidents, injuries, or property damage.
3. Preventive Measures
Adhere to Rated Loads: Always operate within the manufacturer’s specified capacity limits.
Correct Pad Selection: Use pads specifically designed for the jack and load type.
Load Positioning: Ensure even distribution of the load on the pad surface.
Regular Inspection: Monitor pads for signs of wear, deformation, or aging, and replace them as needed.
Environmental Protection: Avoid exposing pads to extreme temperatures, chemicals, or UV light that may weaken the material.
4. Conclusion
Overload risks in vertical jack pads arise from exceeding rated capacity, improper load distribution, material degradation, and incorrect pad selection. Proper load management, pad selection, and routine inspection are essential to maintain safety, stability, and longevity of lifting equipment.
References
Gent, A. N. Engineering with Rubber: How to Design Rubber Components. Hanser Publishers, 2012.
Lake, G. J. “Fatigue and Fracture of Elastomers.” Rubber Chemistry and Technology, 2000.
ASTM D2240 – Standard Test Method for Rubber Property—Durometer Hardness.
ISO 2230 – Rubber Products—Guidelines for Storage and Maintenance.
ASTM D2000 – Standard Classification System for Rubber Products in Automotive and Industrial Applications.
