I Vibration in jack: up and down movement

AI Thread Summary
The discussion focuses on addressing excessive vibration in a scissor lift mechanism that moves up and down. Suggestions include adding torque tubes between the scissor halves to stabilize the platform and prevent chattering during operation. The importance of maintaining parallel movement of the scissor legs is emphasized, as well as the potential need for transversal bracing if the base is flimsy. The placement of hydraulic cylinders on the moving platform is questioned, with a suggestion to mount them on the fixed base to reduce complexity. Overall, the conversation seeks effective solutions to enhance stability and reduce vibration in the mechanism.
Micheal_Leo
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i have this mechanism in real life where the linkage move up and down through rollers rotating forth and back , but when mechanism move there is lot of vibration , please suggest any idea how to reduce vibration on the sides indicated by arrow .

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the structure should be stable and avoid vibration and also should sustain weight equally
 
What causes the platform structure to rise or fall?
How is the force applied?

To remain parallel, the scissors must be constrained for the X legs to remain parallel between the two sides, opening and closing at the same rate.

I see heavy torque tubes between the sides of the platform frame, but none between the scissor halves. Torque tubes could be placed across the machine from the fixed pivot of the scissor legs, one in the base, the other above it, in the platform. That should level the platform and prevent chattering, with a staggered, rise and fall.

There are alternatives that use flexible wires in tension, but those are more complex in this situation.
 
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If the parts forming the base on which the rollers move is as flimsy as represented, adding some transversal bracing may help.
 
Baluncore said:
What causes the platform structure to rise or fall?
How is the force applied?

To remain parallel, the scissors must be constrained for the X legs to remain parallel between the two sides, opening and closing at the same rate.

I see heavy torque tubes between the sides of the platform frame, but none between the scissor halves. Torque tubes could be placed across the machine from the fixed pivot of the scissor legs, one in the base, the other above it, in the platform. That should level the platform and prevent chattering, with a staggered, rise and fall.

There are alternatives that use flexible wires in tension, but those are more complex in this situation.
1727582446286.png

the forces on top of platform while bottom is moving also at same time , two hydrulic cylinders insatlled on top platform that asssist in motion( roller rotates)
 
Draw one side of the scissor mechanism, and show the hydraulic cylinder attachment points and rollers.

Is there a reason why the hydraulic cylinder is mounted on the moving platform, and not on the fixed base, where flexible hydraulic lines, moving with the structure, would not be required?
 
Micheal_Leo said:
but when mechanism move there is lot of vibration
What sort of frequency are you talking about? Is it swaying, rumbling or singing?
 
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