Automatic Locking mechanism for spherical bearings using Push-Pull Solenoid

[Subhash_K]

I am looking to improvise on a current mechanical design that locks spherical bearings (bear 3Kg load) in particular position by tightening of screws. The spherical bearings are usually in locked position and are disengaged only while carrying out calibration. I intend to incorporate automatic locking mechanism maybe by using some sort of push-pull solenoid that disengages locking during calibration.

PS: All the parts are machined in aluminum.

Need your suggestions on mechanical design of such system and selection of an appropriate solenoid that optimal locks spherical bearings for stability. Your expert advice on these aspects is highly valued.

 

[Bluejets]

A screw arrangement would not require any "holding" voltage/current.
Wind in, locked......wind out, unlocked.
Much greater locking power for much smaller mechanics as well.

 

[Subhash_K]

A screw arrangement would not require any "holding" voltage/current.
Wind in, locked......wind out, unlocked.
Much greater locking power for much smaller mechanics as well.

While adjusting the bearings, I need to ensure that the locking mechanism holds tightly at the middle portion I've marked in the green zone. Additionally, the side screws will remain in a static position.

 

[Harald Kapp]

A solenoid will imho not provide the necessary force to lock the bearings in place - unless you use a ridiculously big solenoid, that is.
I suggest you resort to an arrangement with a central locking screw which is operated by a (geared) motor.
You can even add a torque sensor to the axle connecting motor and screw or use a force sensor on the clamping mechanism to achieve a consistent holding force even when the mechanical components wear with time.
An Arduino, a motor driver board and an optional sensor board can do the trick.

The advantage of such an arrangement is that no power is required to hold the clamping mechanism open or closed.
A solenoid on the other hand will require permanent power to keep it engaged.

 

[Subhash_K]

A solenoid will imho not provide the necessary force to lock the bearings in place - unless you use a ridiculously big solenoid, that is.
I suggest you resort to an arrangement with a central locking screw which is operated by a (geared) motor.
You can even add a torque sensor to the axle connecting motor and screw or use a force sensor on the clamping mechanism to achieve a consistent holding force even when the mechanical components wear with time.
An Arduino, a motor driver board and an optional sensor board can do the trick.

The advantage of such an arrangement is that no power is required to hold the clamping mechanism open or closed.
A solenoid on the other hand will require permanent power to keep it engaged.

Thank you for detailed suggestions regarding the geared motor and central locking screw mechanism.
But I do have concerns about the space and weight implications of this setup, as the system's compactness is a crucial factor for my application. that much of setup you suggested need more space and it will effect in size and weight of the system.

 

[Bluejets]

Geared motor and lock of the size required would take less room than a whopping great solenoid.