Originally Posted by mec00063

Hi,

Has anyone had experience with an non centered tripper?

Trippers are usualy designed centered, with discharge for both sides. Due to lack of space, I'm designing a tripper on witch the belt is not centered betwen the rails, and the discharge is to one side only.

I'm thinking about the possibility of having misalignements of the tripper during operation, since the forces will be unbalanced.

Does anybody know if this construction is usual, or if is there any device that must be added to the construction, such as guide rolers, or so on...?

Thank's

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My experience is with a winched passive tripper

using a weight box couterwieght and it

could not be made simpler.

As the tripper was winched back and forth-and still is,

using a double drum wire rope winch with each drum

using a single wire lay and wire rope under tension

and with an over the first drum and under the

second drum spooling for both drums in forward and

reverse the winch gained mechanical advantage with

two sheave blocks to at each end of the tripper in use

to provide additional mechanical advantage and pulling

power for the winch and easy movement.

As you are going to have problems with off center loading and traction

if a winch drive is not used - In my opinion;

step back and re-examine what you have,

Is there any reason at all a pair of tower

mounted material throwers from metso minerals

could not be employed with one belt and walkway which would

be used to feed both tower mounted throwers with the throwers facing each other discharging material to the center and eliminate need for

the tripper entirely?

lzaharis ■

I have seen several one sided trippers working acceptably. Most big ones are one sided. Congratulations on tackling the issue for the little Dinkies.

The misalignment force should be contained within the rail flange reactions. So it simply depends on how accurately the tracks are aligned to limit misalignment.

For a long wheelbase tripper there will be more material weight to provide frictional resistance to skewing, and there will be better alignment within the flange clearances.

Assuming reasonably central material flow within the idlers there is plenty of self centering generated between the wing idlers. This self centering force also counters the horizontal reaction of discharge against the chute wall.

If you still fear skewing you can fit side rollers to engage the rail bulb sides. But I would advise you to only leave room for such rollers "just in case".

Flange lubricators are/used to be available from Acheson Colloids, Cattewater Road

Plymouth PL4 0, United Kingdom 01752 207 120

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Dear mec00063,

The tripper discharge chute can have discharge on one side of conveyor or on both the sides of conveyor (simultaneously) and also of feedback arrangement etc. These are the regularly required arrangement. In all these cases tripper centre line is also conveyor centre line. It is not necessary to make tripper centre line different than the conveyor centre line for one side discharge. Anyway it is choice of the designer about such arrangement.

Regards,

Ishwar G Mulani.

Author of Book : Engineering Science and Application Design for Belt Conveyors.

Author of Book : Belt Feeder Design and Hopper Bin Silo

Advisor / Consultant for Bulk Material Handling System & Issues.

Pune, India.

Tel.: 0091 (0)20 25871916

Email: parimul@pn2.vsnl.net.in ■