Polyurethane Buffer
Product Overview
Polyurethane Buffer (PU Buffer) is a passive shock absorption and anti-collision device engineered with polyurethane elastomer as its core energy-absorbing material. Featuring an internal structure composed of numerous closed-cell or open-cell microstructures, this buffer efficiently converts kinetic energy into elastic potential energy and thermal energy during equipment collision or limit displacement scenarios. It delivers reliable shock absorption, precise limit protection, and effective vibration damping performance, making it an essential safety component for industrial machinery, lifting equipment, and material handling systems that require impact mitigation and structural safeguarding.
Key Features
Lightweight design: Approximately one-tenth the weight of traditional metal spring buffers.
High energy absorption: Maximum compression up to 50% or more.
Environmental resistance: Operating temperature range from -20°C to +60°C; resistant to oil, weak acids, and alkalis.
- Safe and low maintenance: Oil-free, leak-free, spark-free, and nearly maintenance-free, suitable for explosion-proof and low-noise environments.
Working Principle
When impact occurs, the polyurethane microcell structure is compressed, and energy is dissipated through air compression and material deformation.
The buffer exhibits non-linear stiffness, meaning the reaction force increases with compression, effectively limiting rebound and secondary impact.
Typical energy absorption efficiency is 30–50%, depending on material formulation and structure, with a rebound recovery rate of ≥95% after 5 minutes unloading
Main Type
JHQ-A (Stud-mounted type)
Fixed by threaded stud or bolt; suitable for cranes, hoists, and light-duty impact points.JHQ-B (Clamp / Plate-mounted type)
Installed using clamping plates; ideal for conveyors and medium-duty industrial equipment.JHQ-C (Flange-mounted type)
Flange connection; designed for elevators, port machinery, and heavy-duty applications requiring high safety levels.
By Application
Elevator pit buffers (rated speed ≤1.00 m/s)
Overhead cranes and end-stop impact protection
Industrial automation equipment (positioning and transmission systems)
Port berthing and rail vehicle buffering (corrosion-resistant designs recommended)
Typical Applications
Elevator Pit Buffering
Overhead Crane End Stops
Industrial Automation Production Lines
These applications effectively reduce impact forces, improve operational stability, and extend equipment service life.
Selection Guidelines
Recommended operating temperature: -30°C to +60°C; customized material required for extreme conditions.
High humidity or strong corrosive environments significantly reduce service life.
When multiple PU buffers are used in parallel, identical models, dimensions, and installation heights are required to ensure uniform load distribution.
Installation Guidelines
Ensure the buffer surface is intact and free of cracks or deformation.
The mounting base must be clean, flat, and structurally strong.
The buffer centerline must align with the direction of movement; elevator applications require alignment deviation ≤2 mm.
Adequate free space equal to or greater than the maximum compression stroke must be reserved.
Maintenance and Replacement
Visual inspection: monthly
Functional and rebound test: quarterly (≥95% recovery after 5 minutes)
Fastener inspection: quarterly
Immediate replacement is required if cracking, permanent deformation, poor rebound (<90%), severe corrosion, long-term water immersion, or service life exceeding 10 years occurs.
Ordering Information and Customization
Please specify the following when ordering:
Model or series (JHQ-A / B / C)
Required energy absorption per buffer (kJ)
Maximum allowable compression stroke (mm)
Mounting method and installation dimensions
Operating environment conditions
Customization options include non-standard dimensions, hardness grades, corrosion-resistant coatings, stainless steel components, and special formulations for extreme environments.