What's What And To What Aim
Dear Chen Bo,
most probably we see a stacking machine on the photo you provided. Also, no harrow seems to be involved.
However, if for material property reasons the free flowing is not ensured, the harrow reclaiming principle is not applicable and one solution would be to install a chain scraper which shall forcefully disengage material from the pile. But this is a decision to be made before the stockpile equipment is specified and engineered.
Is this something of a new branch or developement you are concerned with, or is this connected with an opertional issue in one of your sites? If so, some more input as to the specificalities would be most welcome.
Regards
R. ■
Whether There Is Other Proposal To Solve This Problem
Dear Roland
Last week I visited one of our client. The circular stacker reclaimer supplied by other manufacture in their cement plant have this problem.
The manufacturer didn't consider the material property and supplied the reclaimer with truss harrow. Our client ask me to modify the harrow
to solve this problem. I understand the harrow with chain scraper can solve this problem. But the harrow with chain scraper is complicated.
I'm thinking whether there is other simple modification to solve this problem.
Thanks
Chen Bo
Sinoma Technology&Equipment Group
Mail: sinomayz@gmail.com ■
Bob Chen
General Manager, Yangzhou FusionBMH Engineering Co., Ltd.
Xian Jiaotong University Industrial Zone A3-211,
Hanjiang District, Yangzhou City, 225000 China
Mobile:+86-15105252769
E-mail: sinomayz@gmail.com or fusionbmh@gmail.com
Website: www.fusionbmh.com (English) or www.fusionbmh.cn(China)
A Truly Harrowing Experience
Diplomatic: as usual.
Your client is responsible for approving the design. Don't blame the supplier!
Now: harrowing should be confined to flat faces. Side to side displacement imparts a degree of compaction in underlying layers and is not a good idea when the working face is concave. You're on a ticket to hell.
I have a personal hatred of harrows since one fell down during erection. Nobody was killed. Then when the chain tracks detached the buckets got buried because the sparkies had not interlocked the harrow and it carried on working. I hate them.
A scraper chain is the only answer and it is hard to imagine why harrowing was ever suggested. What sot of width was considered for the inboard harrow? Come on!
If that monstrous structure at the perimeter wall is a harrow then consider what could it possibly do? A scraper chain is a lot less complicated than a harrow and scraper chain..or what? ■
John Gateleyjohngateley@hotmail.comwww.the-credible-bulk.com
Thanks
So the scraper chain is the only way.
Thanks! ■
Bob Chen
General Manager, Yangzhou FusionBMH Engineering Co., Ltd.
Xian Jiaotong University Industrial Zone A3-211,
Hanjiang District, Yangzhou City, 225000 China
Mobile:+86-15105252769
E-mail: sinomayz@gmail.com or fusionbmh@gmail.com
Website: www.fusionbmh.com (English) or www.fusionbmh.cn(China)
Dislike Explained.
Hating harrows is too strong a word. Observed caution is far too mild.
The system on show reminds me of those fantasy machines dreamed up by Dravo and others during the 1980's.
This is an attempt to reduce building height by replacing the portal and outer boom with a full single scraper running over the bed. Power consumption goes through the roof and the material recovery is complicated by the standing wall which develops at the working face of the bucket line. This wall collapses regularly, it has to, and floods the chainway. Harrowing effectiveness is subject to the material top size. When the bigger stuff gets to the pile bottom it gets 'polished into a wall by the passing bucket edges. Those edges must have bite and if the material doesn't fall into the path no amount of harrowing is going to introduce material. Harrows cannot reach the full bucket width and generally rest on the face side and this inhibits their performance drastically.
There is no mechanical or structural advantage with this type of machine. A truss might have kept the weight down. A properly sized portal A frame would have done the job much better in terms of price and performance: in both directions. Your client has to start again or live with it. I feel DEM Bones again. Would this technology have identified the development of a standing wall? It might, with very detailed work.
Take heart, there are small harrows on some bucket wheel reclaimers which is a case of throwing 2 stones at 1 bird. Somewhere in the depths of the long forgotten eLibrary there was a description of a Californian bucket wheel which was tilted further round. It doesn't seem to have borne fruit and we can't dig the design up. We can only recognise that there are many crowding buckets in operation in various forms, again without harrows. ■
John Gateleyjohngateley@hotmail.comwww.the-credible-bulk.com
Problem for Reclaimer with Harrow
Good day
Attached the photo of reclaimer with harrow
Normally the sweeping movement of the harrow will cause the material to slide to the base. But when the material
is wet or there is much clay in the material the flowbility of material is bad. The operation of reclaimer with harrow
will have difficulties. I will be very grateful if anyone has good idea to solve this problem.
Thanks
Chen Bo
Sinoma Technology&Equipment Group
Mail: sinomayz@gmail.com ■
Bob Chen
General Manager, Yangzhou FusionBMH Engineering Co., Ltd.
Xian Jiaotong University Industrial Zone A3-211,
Hanjiang District, Yangzhou City, 225000 China
Mobile:+86-15105252769
E-mail: sinomayz@gmail.com or fusionbmh@gmail.com
Website: www.fusionbmh.com (English) or www.fusionbmh.cn(China)