A double scissor lift has two stages of scissors that work in tandem, with each set of scissors supporting a lifting platform.
The hydraulic cylinder will typically apply force to one of these scissor stages, causing the arms to expand and raise the platform.
The location of the hydraulic cylinder depends on the design of the lift and the desired lifting behavior. There are a few common locations:
At the Base of the Lift (Fixed End):
The hydraulic cylinder is mounted near the base of the platform, typically at a point where the scissor arms are joined to a fixed base frame. This placement is most common because it allows for simple control over the scissor arm extension.
In Between the Scissors:
In some designs, the hydraulic cylinder can be mounted between the two sets of scissor arms, either pushing or pulling to create the force needed to extend or retract the scissors. This position can help balance the load and create smoother, more even motion during lifting.
On Top of the Lift (Above the Scissors):**
In some designs, the hydraulic cylinder is mounted above the scissor arms, pushing down on the platform to raise it. This configuration is less common but can be used in certain designs where the space at the base is limited or for specific mechanical reasons.
It's essential to consider the force distribution throughout the lift. The hydraulic cylinder must be positioned to create balanced movement. If the cylinder is placed too far to one side, it can cause the platform to tilt or move unevenly.
In a double scissor lift, especially, ensuring the cylinder's placement is central or symmetrically positioned can improve lifting stability and control.
The location of the cylinder also influences how the load is distributed across the scissor arms. The cylinder should be placed in a way that distributes the load evenly across the entire lift mechanism.
If the hydraulic cylinder is too small or improperly located, it may fail to lift the platform evenly or could cause excessive wear on the scissor arms.
Depending on the hydraulic system (whether you're using a single-acting or double-acting cylinder), the hydraulic fluid will either push or pull the piston inside the cylinder. The system should be designed to handle the specific pressures required for the lift.
Ensure that the hydraulic cylinder's placement does not interfere with the safe operation of the lift. It should be clear of any moving parts, and safety mechanisms (such as limit switches) should be integrated to prevent over-extension or over-retraction.
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