Expansion springs, also known as long extension springs, are designed to expand or stretch when force is applied, making them suitable for applications requiring tension.  Long Expansion springs are commonly used in applications such as trampolines, garage doors, and agricultural machinery.

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Enhance the integrity of the wall: the various parts of the cavity wall can be effectively connected together by binding, so that they can work together under the action of earthquakes, reducing the cracking and scattering of the wall.

One common use of heavy duty tension springs is in the automotive industry, where they are used in suspension systems to support the weight of the vehicle and provide a smooth ride. These springs are typically made from high-quality materials such as steel or alloy, which can withstand the stress and strain of constant use.