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Garage door springs counterbalance the weight of the door to make it easy to open and close. They serve the same purpose of counter weights used to balance doors in centuries past and in many doors today. For example, if a garage door weighs 300KG, a spring force of 300KG needs to pull against the weight of the door. This can be accomplished with springs that either stretch or torque special parts to assist in balancing the door.

When torsion springs are wound, they grow in length. Since both ends of the torsion springs on steel rolling doors are secured and cannot move, the spring cannot grow in length. There are two options for fixing this problem. You can stretch the spring yourself with a come-a-long before you secure it to the shaft, or your can purchase pre-stretched springs. This allows the coils to be gapped and to lose most of this gapping when the door closes.

Hangzhou Bluesteel Machine Co.,Ltd 

We are a manufacturer specialized in custom roll forming machinery. With our advanced techniques and experienced staff members, we can produce simple profiles as well as complex components with precision tolerances. Most of our main production staff members have about 10 years of experience, ensuring quality machinery and high values for our customers.

Our products are widely used in steel structure Construction, like roof and wall,and door or window,and supermarket ,warehouse  etc.

Advantages of Roll Forming:

Roll formed parts can have a variety of shapes, angles and curves. Many materials are suitable for our custom roll forming machines, which allows us to provide components and parts with a wide variety of plated, pre-painted and laminated materials to meet your roll forming needs. We design products that best meet specific needs.

bluesteel Machine’s mission is to provide the highest quality products as a competitive price, good in Quality, On-Time Deliveries, and Superlative Customer Support.

bluesteel Machine has become a reliable bridge between overseas customers and rollforming machines based on its riche professional experience in marketing steel products and providing services. The company persists in seeking global business partners, provides them solid service and keeps stable and reliance business modules.