1. ## Conveyor Speed Calculation

I need have 2 feed conveyors, speed 12 metres per minute, which both then feed onto 1 tranverse conveyor, what speed would the tranverse conveyor need to travel at assuming all conveyors are the same width, material is boxes?

2. This apparently simple question has a twist at the end when it refers to 'boxes' being conveyed. There is no information about the aspect ratio of the boxes, the spacing of the boxes, how they are oriented at the transfer point or are synchronised to merge and avoid clashes, so I believe the answer is indeterminate. The situation would seem to call for a 'meshing' device to control the release of alternate boxes and a spacing margin of safety, as they presumably cannot 'shuffle' in a converging path like cans or conventional particulate solids.

3. ## Boxing in the Dark.

Transverse conveyor speed is indeed indeterminate and also immaterial.You need to consider box speed across the transfer table. You have not given any indication of the heights available and so it must be assumed that a transfer table helps.
There will have to be a couple of side walls and so there is no issue. Incoming boxes sit idle on the transverse rollers and on the transfer table until there is a gap in the main line. If the slopes are right and the box size spectrum is reasonable the incoming box holds back the mainstream until a gap develops to accommodate the incoming box. Slopes are the answer and must be very carefully calibrated. Similar impingement principles can be extended to belt conveying and the friction coefficient needs to be low.
Box and pallet handling is more widespread, sophisticated and competitive than bulk particulate handling and you will get a better idea by surfing websites more appropriate to your application. There are also Youtube videos showing animations of similar situations.

4. ## Thanks for the responses

The situation is that there are no slopes or transfer tables, all conveyors are horizontal belt conveyors, there are 2 conveyors feeding randomly sized boxes onto one tranverse conveyor which in turn feed into a chute, the randomness is causing the problem whereby the boxes are bridging in the chute causing blockages and the random sizing present problems in 'meshing' the boxes, I was exploring the possibility of increasing the speed of the tranverse conveyor to add some velocity to the boxes when ejected from the conveyor into the chute.

5. ## another world

Hello,

in a former prof. position I did airport luggage transporting systems. There it was necessary (for spacing / jamming reasons) to allocate slots on the collecting conveyor, and the feeders were only allowed to advance one piece of luggage if there was coming a free slot. This system may be done simply (light gates, counter / controller) or more sophisticated, but unless you can afford damaged boxes or the occasional jam'n wedge event you will have to put a control onto the randomness. Btw, the feeders need to be able to have a stepped operation (stop and go) and thus to act as storage device.
Regards
R.

6. Hello,

This thread is of November 2015, so it is obvious that I am responding very late. However, I am considering that the information may be of some use to someone.

Two bagging machines operating in a synchronised manner, and then say discharge on their individual conveyor no. 1A and 1B. Then both are discharging onto third conveyor say conveyor no. 2. This can have 2 kinds of situation:

Situation 1: All 3 conveyors have a common speed such that conveyor 1A and 1B bags will have longer spacing. When these conveyors discharge onto 3rd conveyor, the spacing / pitch of the bags will become half. However, initially speed is chosen such that one bag will not lie on other bag. In your case, read box instead of bag.

Situation 2: Conveyor 1A and 1B have speed say 0.5 mps and conveyor 2 has speed say 1.0 mps. In this case, the spacing / pitch of the bags will appear same on conveyor 1A, 1B and 2.

I think such situation is likely to be quite common in fertiliser plant and cement plant.

Ishwar G. Mulani
Author of Book: ‘Engineering Science And Application Design For Belt Conveyors’. Conveyor design basis is ISO (thereby book is helpful to design conveyors as per national standards of most of the countries across world). New print Nov., 2012.
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: conveyor.ishwar.mulani@gmail.com
Website: www.conveyor.ishwarmulani.com