The Secret of "Auto-Closing" Doors: What Exactly Is a Floor Spring?
Have you ever wondered why the glass doors in shopping malls and office buildings close gently on their own without having to push them all the way down? The key lies in the invisible force hidden in the ground beneath the door: the floor spring.
It's essentially a hydraulic transmission device with two core functions: First, load-bearing, which firmly supports the door, ensuring it opens and closes smoothly; and second, speed control, which controls the speed of the door's closing by regulating the flow of hydraulic oil within it, ensuring it neither slams against the wall nor gets stuck mid-close.
Structurally, a floor spring consists of three main parts:
• Main Cylinder: Buried in the ground, this "little house" houses the hydraulic oil and core components, and is also crucial for load-bearing.
• Main Shaft: Connected to the door upwards, it drives the door's rotation to open and close.
• Speed Control Valve: Acting like a throttle, it adjusts the flow rate of the hydraulic oil, thereby controlling the speed of the door's closing to prevent pinching or noisy closing.
Floor springs are almost always essential for heavy-duty doors that require automatic reclosing (such as glass and metal doors). While less visible than door handles, they silently shoulder the heavy responsibility of ensuring the door's usability and safety.
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