A double-cylinder vertical material lift uses two synchronized hydraulic cylinders to raise and lower the platform. To ensure operator and cargo safety, it is equipped with multiple anti-fall protection systems:
1. Mechanical Anti-Fall Safety Device
Purpose: Prevents the platform from dropping suddenly in the event of hydraulic failure (e.g., hose rupture or cylinder malfunction).
Structure: Typically includes a ratchet locking system, fall arrest blocks, or anti-fall wedges integrated into the guide rail system.
Working Principle:
When the platform descends faster than normal (indicating a failure), the anti-fall device is triggered by the sudden speed change. It locks the platform to the guide rail, halting the fall instantly.
2. Hydraulic Safety Valve (Burst Valve)
Function: Installed on the hydraulic circuit, it automatically closes if a hose bursts, stopping hydraulic fluid from flowing uncontrollably.
Effect: Prevents uncontrolled descent of the platform.
3. Synchronous Control System
Purpose: Ensures both cylinders extend and retract simultaneously.
Protection: If there is an imbalance or desynchronization, the system can pause operation to avoid platform tilting, which could lead to jamming or instability.
4. Limit Switches & Sensors
Positioned at upper and lower travel limits, they prevent over-travel and automatically cut off power when the platform reaches its maximum travel distance.
Automatic Door Rolling Door Function
To enhance automation and safety during loading/unloading, vertical lifts are often equipped with automatic rolling doors (also called shutter doors):
1. Structure
Typically consists of steel or aluminum slats that roll into a compact housing above the door opening.
Driven by an electric motor with gearbox and limit switches.
2. Automatic Operation
Controlled by the lift's control panel or PLC system.
When the platform reaches a designated floor, the system automatically opens the rolling door for access.
When the platform departs, the door closes automatically, ensuring safe containment of the shaft.
3. Safety Interlock System
The door is interlocked with the platform:
The lift will not operate unless the door is fully closed.
The door will not open unless the platform is at the correct level.
Prevents accidental entry into the shaft and guarantees operator safety.
4. Obstacle Detection & Reversal
Some rolling doors include infrared sensors or pressure edges to detect obstacles.
If something is detected during closing, the door automatically reverses to prevent damage or injury.
Hot Tags: vertical material lift, China, manufacturers, suppliers, factory, customized, buy, cheap, for sale, made in China
