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Crane Buffer

Description:

A buffer or bumper is a necessary safety device used in overhead cranes, gantry cranes, and other material handling equipment to absorb impact energy and prevent damage when the crane or trolley reaches the end of its travel path.

crane-buffer

Buffer Types:

  • Rubber Buffers:

    • Cheap price.

    • Made of high-quality rubber.

    • Suitable for light to medium-duty cranes.

    • Cost-effective and easy to maintain.

  • Polyurethane Buffers:

    • Cheap price.

    • Most commonly seen buffers for overhead crane and gantry crane.

    • Made from high-density polyurethane material.

    • Resistant to wear, weather, and chemicals.

    • Suitable for various crane applications.

  • Spring Buffers:

    • Use steel springs to absorb impact.

    • Suitable for medium-duty cranes.

    • More durable than rubber buffers but less effective than hydraulic buffers.

  • Hydraulic Buffers:​

    • Use hydraulic fluid to absorb energy.

    • Ideal for high-speed or heavy-duty cranes.

    • Provide smooth deceleration and minimal rebound.

overhead-crane-Polyurethane-Buffer

Polyurethane Buffers:

  • Application: Polyurethane rubber buffers are designed for anti-collision protection in crane and trolley systems.

  • Features: These buffers offer excellent hardness, high strength, rapid recovery, and resistance to oil, aging, acids, and corrosion.

  • Advantages: They are lightweight, cost-effective, and feature a simple mechanism with low noise, no spark generation, and easy installation and maintenance. Additionally, they ensure a long service life.

  • Types & Specifications: According to different installation method, polyurethane buffers are categorized into 3 series:

    • Stud Type (JHQ-A)

    • Platen Type (JHQ-B)

    • Flange-Plate Type (JHQ-C)

Each series includes 14 to 21 specifications, with each specification corresponding to a buffer designed for a specific capacity.

crane-spring-buffer

Spring Buffers:

  • Introduction: The spring buffer is composed of a head, a spring, and a housing, with a simple structure and reliable use. When the crane collides with the spring buffer, the energy is mainly converted into the compression energy of the spring, thereby reducing the impact and effectively protecting the machine.

crane-hydraulic-buffer

Hydraulic Buffers:

  • Introduction: The working chamber of the hydraulic buffer is equipped with a reset spring, a top rod, and oil. When the hydraulic buffer is subjected to collision pressure, the kinetic energy is transferred to the piston through the plug and acceleration spring, causing it to move to the right and reducing the impact force.

  • Working principle: When the piston starts to move, due to the large annular gap between it and the top rod, the oil is easily squeezed out; As the piston continues to move, the annular gap gradually decreases and the piston resistance increases until the cylindrical stage of the top rod, where the annular gap is minimized and the resistance reaches its maximum value. During this process, the buffer consumes a large amount of kinetic energy and plays a buffering role. After the buffering effect is exerted, the piston will be pushed back to its original position by the reset spring, completing a working cycle and continuously providing buffering effect. Hydraulic buffers are suitable for various applications such as lifting and transportation, elevators, metallurgy, port machinery, railway vehicles, etc.

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