Horse And Hobby Bounce
Greetings Sandeep,
your motor mounting explanation is not very clear simply because any tyler screen I am familiar with has motor mounting that is horizontal and has a belt drive or is a Derrick screener assembly or a Rotex but I would suggest using air bags instead of coil springs simply because your motors are generating more energy than can be utilized by the screen in my opinion please corect me if I am wrong but it sounds as if your screening energy is being thrown out and away from the screener rather than in line/linearly.
lzaharis ■
Re: Hobby Horsing
Maybe you are right.......
But how do you explain this phenomena? for the first 20 second the screen is performing well.I tried to mount the motors in 12o clock and 3o clock position on the main beam with no noticeable change in motion.
One thing i do not understand is that the material is not moving towards the discharge.
There is a lot of bounce during stopping. I suspect the springs. Is it possible to increase the stiffness of the springs and run them.
Secondly I also tried to weld some 50 Kg weights on the feed side spring brackets to correct the CG if any. NO NOTICEABLE CHANGE> >>> ■
Hobby Horsing
Dear Sir,
I am testing a 8 x 16 horizontal linear motion screen driven using 2 unbalanced motors which are mounted at 45Degree to the horizontal and the t motors are mounted horizontally on the beam centre.
The typical problem i am facing is that the screen is vibration and the material is moving from feed to discharge for sometime and then moving back towards the feed end.
The material also tends to bounce on its location at times and then starts moving towards the discharge.
This cycle is simmilar to a problem faced by Mr. John McKenzie with his tyler screen and he termed it hobby horsing.
My screen is mounted on 8 coil springs. I have noticed that after stoping the screen bounces excessively on the springs.it bounces for 5 mins approximately and bounces very wildly.
I tried to insert 4 springs inside the discharge end coil springs to increase the stiffness. But no use.
One typical thing that i noticed is that at 30% setting of counterweights the screen performs well. at 50% setting it performs Ok except that the speed of material at the feed end is slower than that at the discharge end.
70% and beyond the screen " hobby horses "
I will not be able to change the speed of the motors so please suggest a corrective for this phenomena.
Regards
Sandeep ■