How To Ensure The Synchronization of Multiple Screw Jack Lifting Systems Operating

Ensuring synchronization in multiple screw jack lifting systems is achieved through two primary methods: mechanical linking and electronic control. Mechanical synchronization is generally preferred for its simplicity and reliability in heavy-duty applications, while electronic synchronization offers greater flexibility and precision for complex or non-linked setups.

1. Mechanical Synchronization (Recommended for Reliability)

This method physically connects multiple jacks to a single power source (manual crank or electric motor) using a network of transmission components.

Connecting Shafts and Couplings: Drive shafts link the input shafts of multiple jacks. Flexible couplings are used to accommodate minor alignment errors during installation.

Miter (Bevel) Gearboxes: These allow the drive shafts to change direction (90 degrees), enabling configurations like "U", "T", "L", or "H" layouts to reach corners of a platform.

Uniform Speed: Because every jack is mechanically geared to the same drive shaft, they are forced to move at identical speeds regardless of load distribution.

Alignment Precision: For success, load support points must be perfectly aligned to ensure uniform distribution; misalignment can cause jacks to act as counter-loads or brakes.

2. Electronic Synchronization (For Complex or Remote Systems)

When jacks cannot be physically linked due to distance or obstacles, they are independently motorized and synchronized via a control system.

Closed-Loop Feedback: Each jack is equipped with encoders or Hall effect sensors that constantly monitor its position.

PLC or Microcomputer Control: A Programmable Logic Controller (PLC) compares the positions of all jacks in real-time. If one jack lags or leads, the controller adjusts the motor speed (via Variable Frequency Drives) to maintain synchronization within a precise tolerance (e.g., 0.05mm).

Safety Features: If one motor disconnects or faults, the control box will immediately halt all other units to prevent tilting or damage to the load.

3. Key Design Considerations

Thread Direction: In some configurations, you must alternate between left-hand and right-hand screw threads so that all jacks raise or lower in unison when driven by a single common shaft.

Support Elements: When drive shafts exceed a certain length, pillow blocks (intermediate bearings) must be used to prevent shaft sagging and vibration.

System Sizing: Total system torque must not exceed the rating of the primary drive motor or the first miter gearbox in the line.

Custom Design Tools: Modern manufacturers offer online software to help engineers calculate torque and select compatible components for multi-jack systems.