Contact the supplier and get his representative to inspect the installation and get his advice. ■

Check that the location of the installation was done as per the OEM's specification. Improper attack angle on the scraper can cause what you are experiencing.

Take designer's advise and have the manufacturer rep inspect it. ■

Originally Posted by meejay

Hello,

There are Rockline EZP1 primary scrapers at each of four belt coneyors on a single feeding system. The scraper compression spring is at the lowest limit given by the vendor. When it is compressed more to a point near the highest limit there appears an annoying noise makes you think that something is going wrong.

What could be the possible reason for this noise and how can I overcome this noise?

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Gary and Designer are right in what they are telling you. if the angle of attack is wrong you may end up with a worn off scrapper and ripped up belt for your troubles from the scraper frame

lzaharis ■

If I hadn't just seen the website I wouldn't have believed the gadget was offered for sale: but there you go. You have a single wide blade scraping a rubber belt while it is supported by a rotating drum. There is nowhere for anything to yield. A high spot opens gaps; drum irregularities induce vibrations; full line contact cannot be achieved unless both sides deflect identically & simultaneously.

Since the device is advertised as a DIY item it is highly likely that the after sales advice will cost more than if you'd bought a proper multi-blade belt cleaner from eg. Martin or Hosch ■

From the installation instructions -

Alas, it doesn't tell you if you should increase tension, decrease tension to eliminate vibration. Maybe you just play around with it and hope for the best

Still, there's always room for one more belt scraper in the marketplace ■

Meejay,

Flexco manufactures the Rockline series of cleaners as well as several more sophisticated brands. I am by no means an expert on our cleaners and have asked others to comment. I was told that the problem that you are experiencing is normally caused by the pole being situated too far from the pulley. Check to make sure that the cleaner is installed correctly.

Kevin Finnegan ■

I have been designing, manufacturing and installing belt cleaners on conveyors from 400 tph to 9000 tph for 11 years, so I have seen many different problems and misconceptions.

I can see three reasons why you have this irritating noise unless you use very low tension.

1) The frame is positioned too far away from the belt/drum surface.

This is a VERY common problem. One rule of thumb is to place the frame as close as possible to the pulley, provided the blade tips are still firmly pressing the belt surface, and not any other part of the blade.

When the frame is too far away, you get a wedge effect. The blade tip is dragged down by the belt and high counteracting forces develop. As the blade wears, the problem gets worse, until the belt cleaner flips over, or the frame gets bent, or the belt motor will overload and shut itself off.

2) The frame is already bent.

Repair it and replace it. It would be good to reinforce it with an inner through-pipe. I have alot of respect towards Flexco, but the frame pipe on their Rockline precleaner looks a bit flimsy. Getting an inner tube through and plug-welding it at five points would be reasonable and never hurt. Don´t forget to retouch the paint with epoxy spray after buffing and cleaning the naked metal surfaces.

3) The mounting position is too wide for the frame section

This is another common problem with primary cleaners or precleaners (whichever way you like to call them). Again, reinforce the frame with an inner pipe of a size that fits snugly, or consider two inner support positions where the frame-tube can sit. Basically two half-circle UHMW-PE pieces holding the pipe from below and supported by a steel bracket made to fit in place.

You can send me a drawing/photos of the place if you want, and I can further review the issue. ■