Hello, let me introduce myself Andy, I have a project for false ceiling fan lifts. Who says fan says with an axis of rotation. The false ceilings will allow access to an emergency hatch, to allow the evacuation of people stranded.
I am looking for a geared motor capable of opening and closing this false ceiling.
The false ceilings are made up of 9 slats each weighing 2 kg for a total of 17 kg.
I don't have a properly defined rotational speed.
For friction I use Teflon strips to limit friction as much as possible.
I have a 100 mm high false ceiling space.
I'm looking for an engine with enough torque to open and close this false ceiling.
Thank you.
Kind regards
Andy.K
INGIDESIGN
10.png
The easiest way is to contact your engine supplier.
The voltage used would have to be defined.
One question: do you have energy available to operate your engine in the situation described (elevator blocked and therefore safe)?
3 Likes
Hello, for me I will need a voltage of 12V-24V.
Hello @ all
I don't see how the tension gives a motor torque or I must have missed a step in the mecha courses and the basic elec.
We are looking for a geared motor (we wonder why such a solution) but without specifying the rotation speed.
As for the elements of the problem, it makes me cold in the mouse and melts the keyboard.
I read this "false ceilings" is made up of 9 planks each weighing 2 kg for a total of 17 kg. " but especially for "false ceiling lifts in a fan" for "friction I use Teflon strips in order to limit friction as much as possible.
The applicant forgets several elements, especially that the effort between the start and the end is not proportional (and is not linear) and that the friction does not have it either: especially with the chosen solution of Teflon. This shows, among other things, that kinematics are not taken into account in the estimation of friction even with a wet finger.
Kind regards
1 Like
Hello, thank you for your answer zozo, I can see that you are better stalled than me.
So that's why I'm coming to you. As for the effort between the start and the end, you may have to enlighten me so that I can help you in turn
The coefficient of friction of Teflon steel is: 0.1.
Thank you.
Kind regards
Good evening @be1_11
If I understand how your system works and this type of assembly in general, it should work like this.
You only have to pilot one blade for the others to follow. The first one folds back and when it has advanced equal value to the second blade it starts pushing the second card and so on.
If we retain this principle, then all you need is a gas spring to pull or push the first blade, either on 90°, either with a mechanical trick on 180° but always with the necessary stroke for 90°.
To go along with the judicious remark of @stefbeno the advantage of the gas spring is that it can be activated even without electricity. Most smoke extraction hatch safety systems work according to this principle. Either the gas spring is empty and it is a gas cartridge that is triggered manually by the elevator passengers or the firefighters, etc... Either the cylinder is under pressure and ready to make its course but a mechanical system prevents it from moving forward. Safety consists in pulling on the mechanical system which then unlocks the cylinder which is under permanent pressure.
That's why I was talking about kinematics because your fans and the right shape to push or pull each other and you need to have a studied size of your cylinder.
There are other possibilities than the gas spring: like a mass that slides up and down the cab and pulls on the first blade by means of a cable and a corner pulley.
For friction it's a false problem (even with Teflon) because it's NS because in fact only the force of the cylinder or the number of kg of mass counts. You can replace the Teflon with a small nylon wheel for €0.15 at the end of each blade. In addition, this small wheel can also have the function of pusher for the next blade.
Kind regards
PS: mail your ASM with all the parts if you want more help we can give you a better opinion on your solution or another.