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Brief Discussion on Fall Prevention Measures for Automated Parking Systems
Published Time:
2020-03-27
A device that prevents a carrier or vehicle pallet from falling when it reaches its position and is in a static elevated state is called a static anti-fall device; correspondingly, another type is a dynamic anti-fall device, which can prevent the carrier or vehicle pallet from falling during its movement.
Mechanical parking systems employ various anti-drop device structures, generally categorized into two types based on their application: The first, commonly known as an anti-drop device, prevents the lifting mechanism or carrier plate from falling when stationary in a raised position; this is called a static anti-drop device. Conversely, a dynamic anti-drop device prevents falls during the movement of the lifting mechanism or carrier plate. Different types of parking equipment and operating methods (man-car co-riding, semi-automatic, automatic) have varying requirements for anti-drop performance. Static anti-drop devices are mainly suitable for lifting and shifting, and simple lifting types of mechanical parking equipment. For unmanned or semi-automatic types and other categories of parking equipment, where vehicles or personnel need to enter and exit the lifting mechanism or carrier plate, and there is a drop of 500mm or more with a potential for falling, such anti-drop devices should also be installed to prevent accidental falls of the lifting mechanism or carrier plate and protect personnel or objects.
Effective and commonly used dynamic anti-drop devices for parking systems include safety clamps and speed limiters, primarily used in man-car co-riding systems to protect personnel. Current Chinese standards for parking equipment stipulate that "safety clamps and speed limiters should be installed in man-car co-riding lifts (except hydraulic direct-push lifts)." Furthermore, regulations on the periodic inspection of lifting machinery specify that "force-driven and traction-driven lifts (excluding hydraulic direct-push lifts) should be equipped with safety clamps and speed limiters (for man-car co-riding systems). Lifts with speeds exceeding 0.63 m/s should use progressive safety clamps. When a lift falls or its descent speed exceeds the speed limiter's activation speed, the safety clamp should engage and cut off the power to the drive system. The speed limiter and safety clamp must have type test certifications." Elevator manufacturing and installation safety regulations further require that "if the car is equipped with multiple safety clamps, they should all be progressive."
For hydraulic direct-push lifts used in parking systems, an anti-burst valve rigidly connected to the cylinder prevents carrier plate drops. When multiple cylinders are used, a single anti-burst valve can be shared to prevent tilting caused by the difficulty of synchronizing multiple valves.
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