Looking for a Tachometer ( 4-20 ma ) to sense FPM on a cloth belt .

Rob S. · Jun 24, 2018

Good Morning ,

Do you guys know of any tachometers ( 4-20 ma ) with a fragile soft wheel to sense FPM on a cloth belt ? I was thinking of using a weighted bracket and the weight of the tachometer to drop this wheel on the belt.

Thanks for your advice and sharing your experiences .

Mickey · Jun 24, 2018

What moves the belt? Is there slippage?

Rob S. · Jun 24, 2018

Possibly . That is why I want to pick up the actual belt movement.

Thanks

Ozpeter · Jun 24, 2018

Have you considered non-contact laser sensors? I haven't used them myself but I know that they exist.

Here is a link to the first thing I found via google.
http://www.protonproducts.com/products/sl-series/sl-series/

OkiePC · Jun 24, 2018

Ozpeter said:
Have you considered non-contact laser sensors? I haven't used them myself but I know that they exist.

Here is a link to the first thing I found via google.
http://www.protonproducts.com/products/sl-series/sl-series/

That would be the ideal answer where funds are not a limiting factor. It has been over ten years since I worked with that type of device and the hardware cost exceeded ten grand. Maybe they have become less expensive.

Ozpeter · Jun 24, 2018

Unfortunately, sometimes there is a right way and a cheap way to things.

OkiePC · Jun 24, 2018

Ozpeter said:
Unfortunately, sometimes there is a right way and a cheap way to things.

I had a situation in which there was no way to (within required tolerance) detect the distance traveled by the product except for a laser displacement velocimeter.

The shaft driven encoder didn't account for slippage between the roller and the conveyor or between the conveyor belt and the product. It was not possible to use an encoder wheel touching the product, so we put it against the conveyor belt. There, it still didn't account for some slippage between the belt and the product and actually suffered from occasional bouts of slippage between itself and the belt.

First we did it cheapest, then we did it less cheap, eventually we did it over.

Mispeld · Jun 25, 2018

OkiePC said:
That would be the ideal answer where funds are not a limiting factor. It has been over ten years since I worked with that type of device and the hardware cost exceeded ten grand. Maybe they have become less expensive.

Some of these products are under $10K. We have been using them for many years, through buy-outs with Beta now owning the product line.

Beta Laserspeed Product Line

bryan_schreiner · Jun 25, 2018

Would belt slippage still be an issue if you put an encoder on the driven pulley rather than the drive pulley?

Toine · Jun 25, 2018

My thoughts exactly Bryan, this is what we do for belt speed sensors. Though for my purposes the exact speed of belt and product is often not very important. We are good as long as we know it is still moving at roughly the design speed, give or take x percent.

geniusintraining · Jun 25, 2018

When I worked for IP we had some belts about 50 yards so they would grow and shrink with speeds also load weight of the products, the drive pulley and idler pulley would both slip

Any chance you check the actual product speed?

Looking for a Tachometer ( 4-20 ma ) to sense FPM on a cloth belt .

Rob S.

Member

Mickey

Lifetime Supporting Member

Rob S.

Member

Ozpeter

Member

OkiePC

Lifetime Supporting Member

Ozpeter

Member

OkiePC

Lifetime Supporting Member

Mispeld

Member

bryan_schreiner

Member

Toine

Member

geniusintraining

Lifetime Supporting Member + Moderator

Similar Topics