Dear Mr. David,

The flow division from conveyor discharge (across belt width) can be approximately controlled by sliding prism (triangle). The peak of this prism will be approximately at center of pulley (belt width). The flow division can be controlled by :

1) Manually adjusting the location of prism, and then setting / fixing its position for reasonably equal division in particular running of belt.

2) Adjusting the location of prism by hydraulic means. The hydraulic system will have feedback from current sensors of screen / crushers (equipment after flow divider). The system will try to position the divider so that both the current values are nearly identical, which is reflection of load on that equipment. This system works automatically all the time.

The aforesaid prism of steel fabrication (divider) is located above the two legs of chute (and within chute body).

Regards,

Ishwar G Mulani.

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

Advisor / Consultant for Bulk Material Handling System & Issues.

Email : parimul@pn2.vsnl.net.in

Tel.: 0091 (0)20 25882916 ■

Redesign your chute to create a "riffle chute" feeding each leg of your chute. The riffler is made of a series of plates that every other plate goes to one chute and the remaining every other plate goes to the other. Be sure the the total open area between all the plates is equal to the open area of your existing chute or you will experience plugging or surging.

I have use this type of chute with great success feeding salt to vibrating screens.

Best picture which is close to what I am attempting to describe is in link below.

http://www.alphastat.com/WhatsWrong.htm

Hope this helps.

Gary Blenkhorn ■

David

Fix the feed to the conveyor that has tracking problems. A uniform flow, symmetrically placed assures proper division.

You can add other features or redesign the culprit. It does seem like adding complexity when you need to redesign the initial chute that causes the problem in the first place.

We have implemented gate split feed, use downstream monitoring of mass balance or bias streams to a setpoint or control position, but you are always a little late in the correction.

You also need a dead-band and PID which controls on error. Again, this is not as accurate as placing the ideal feed symmetry onto the conveyor feeding your splitter.

Lawrence Nordell

www.conveyor-dynamics.com ■