I have to design a motorized vertical closing door for a special machine. The principle: The door descends vertically thanks to a worm screw (motor + nut). At the bottom of the stroke, the door must be offset laterally by a few millimetres (by a cam) to plate and ensure the seal.
My problem: How to connect the green plate to the door, while allowing: Vertical translation guided by the screw, A small lateral movement at the bottom of the stroke without blocking or breaking the screw or nut.
I was thinking of putting a small linear guide (IGUS trolley or slide) between the plate and the top of the door, to absorb the lateral movement, but I don't know if it's the best solution or simply oblongs on this part but not the best solution because of the metal vs metal friction and precise tightening to master)
If anyone has already done this type of assembly (guillotine with side deposition), or has a mechanical system to recommend (linkage, slide, ball joint, other), I'm a taker.
Is it me or do you only have your door at the bottom? If you want to tackle everywhere you will probably have to double your slides. Switching to cams for the guide + cam roller mounted on your blue door should surely allow you to simplify the manufacture/assembly. Currently you have to manage the tilting of your guide carriage at the end of the movement (so one more axis): no need for this if you have a cam roller attached to the door.
Mechanically it's a not great solution, but if you put your motor at the top of your auger, you could possibly play on the bending of your rod to absorb the final displacement (to be checked by the calculation because if the rod is very rigid, you will either explode everything or have a very big wear of the nut). If the gearbox is mounted ball joint, it should work even better. With nut + ball motor it works for sure. With your current geometry a double ball joint should also work but the top of the rod may move a lot.
NB: make sure that your rod is not reversible if you don't want to get a guillotine.
Hello Thank you for your feedback. The cam is already doubled: tilting at the top and bottom, the waterproofing is good all around. The rollers are attached to the door and follow the profile of the rail, so the plating is handled by the cam, not the nut. I want to avoid working/flexing the screw rod, so I'm looking at a ball joint on the drive side. Would you advise to put the ball joint on the nut side or between the green plate and the door? Ps: does it exist * ball joint for a screw? Thank you
