Dear Sirs,

my new patented rollers are made out of FULL-PLASTIC. This plastic is very low-cost! For conveyors with curves I think you get a new area, because it is easy to give them a conic form.

Par example: for conveyors up to 1000 mm belt wide.

left roll 80->86 mm; middle roll 86->92mm; right roll 92->98mmØ

For conveyors with more beltwide, we take rollers with bigger - Ø

If you send me your mail-address I can give you more information of this inovatif rollers

Best regards

Blaha, Peter Rosenstr.5 D-85609 Aschheim near Munich ■

Originally Posted by BLAHAPETER

.... because it is easy to give them a conic form.

Par example: for conveyors up to 1000 mm belt wide.

left roll 80->86 mm; middle roll 86->92mm; right roll 92->98mmØ

For conveyors with more beltwide, we take rollers with bigger - Ø

So rather than parallel rollers you would use taper rollers with a cone shape■

Originally Posted by designer

So rather than parallel rollers you would use taper rollers with a cone shape

I'm open minded on this one. If the belt goes round a bend then the inner edge should not be moving as fast as the outer edge. That's what increases wear on rolling stock wheels, where both wheels are fixed on the same axles. Carrying the analogy over the full belt width ....this lad has got a point...and opened a right can of worms.

More information on the rollers proposed is required....Peter...whats your present share price?■

Many years ago I was introduced to a form of twin belt elevator. The upper and lower bends, I was told, contained special features which were not visible behind covers. Later I discovered that the special features were solid plastic rollers machined to a concave profile to "match the deformed shape of the belt and give support across the belt width".

Being a simple lad from the country (you know the saying county born, country bred, strong of arm, but thick of head) I thought, interesting, but the belt has a constant linear velocity and the tangential velocity of the roller surface varies with the radius

The designers never did explain how this was a clever special feature. ■

Originally Posted by designer

So rather than parallel rollers you would use taper rollers with a cone shape

Yes, and no! (I don't understand "taper-rollers"!

My inovatif rollers are made out of a very cheep "Recycled FULL plastic material". so I have no problems while the production to give the rollers a different form. The inside of the rollers is quite the same than in steel rollers. This is a new simple feature to have give the belts a better centration to the middle, equal if you want to go around a curve, or you have reversible conveyor - than you take double conic roller sets (or garlands)

The price of such rollers is very closed to parallel steel rollers!

Give me a chance to send you more informations in form of drawings an pictures.

Best regards

BLAHA, Peter Rosenstr.5 D-85609 Aschheim near Munich

(FAX 0049 89 9039200)

For more information, please visit:

https://edir.bulk-online.com/oldedirredirect/204146.htm

http://www.google.com/search?client=...UTF-8&oe=UTF-8 ■

Originally Posted by BLAHAPETER

Yes, and no! (I don't understand "taper-rollers"!

Taper - i.e. smaller one end than the other ---- e.g. a frustum of a cone ■

Dear Sirs,

yes, I speak about taper rollers out of recycled, low cost, full plastic material.

What are the dimensions of your Steel Rollers?

I try to translate your form in my system and then I can give you an idea for the price and the possibility of a production.

Best regards

Peter Blaha ■

Can we put this one back on track, however curved. The power of 1.7 is clearly not the answer to the universe (any more than 42). The origin of the formula should probably be referred back to the authors of the quoted article. That's the easiest way.

Does present theory, in all its glory, account for the aquired velocity profile in a belt travelling along a horizontal curve? Our forefathers kicked profiled idlers into touch very soon after the inception of belt conveyors that ran straight ahead; this on the grounds of excessive belt wear. Now we still use cylindrical rollers to support a belt around a horizontal curve; seemingly restoring the level of belt wear that our forefathers eliminated some seven score years ago. Well???

Once again; 'There's more to cardboard boxes than meets the eye.' ■

Hi all..

For horizontal curves, the super elevation and forward tilt of the idler frames is calculated to drive the belt towards the centre line around the curve.

The point from what I understand from the above, concerning tapered rollers to compensate for the (negligible) effective belt speeds from inside to outside of the curve is seemingly irrelevant, except that belts do tend to climb to the high side of rolling frustums.

Quite frankly though, I would stick to the norm and calculate the super elevation and forward tilt for all load cases, from first principles on a computer as I do, for conventional rolls.

Also, I don't use many plastic rolls in the curves due to their low coefficient of friction with the belt.

Cheers

LSL Tekpro ■

If the curved path speed difference is negligible or irrelevant then are we to understand that vehicles travelling along curved motorways do not require differential gearing in the drivelines because the attributable tyre wear would be negligible? Not all roads lead to Bloemfontein. ■

The outer roll is independent from the inner roll, (and both are independent from the central roll).

In your analogy of a car on a curved motorway going to Bloemfontein, you are actually implying that you should fit conical tyres.... I rest my case!

LSL Tekpro ■

What is the smallest horizontal curve radius using steel cord belt and its installation name?? ■

I recently was called in to see what I could do for a client who has a 6km overland conveyor with a 1.2 km radius horizontal curve.

He was complaining that when empty, the belt climbs out of the trough, and climbs up the vertical angle iron posts which hold up the protective sheeting!

He actually had to put vertical idler rollers on these posts to stop them wearing out..

I noticed that the idler frame super-elevation and forward tilt was not correct, but even if I change all the idler configurations, I calculated that at that tight radius, I will never be able to get the belt to track within 80 mm for all load conditions, which is the limit of what I normally aim for.

Personally, I don't go less than about 2.5 km horizontal radius

Cheers

Taggart LSL Tekpro ■

CDI has designed and installed a belt that can negotiate less than 400 m radius, at 1100 mm wide, using steel cord construction.

The selection is highly dependent on belt width, strength, tension at the horizontal curve, vertical curve radius, temperature, belt construction modulus, allowable banking angles that do not cause belt curling or buckling, and belt speed to control product motion against centrifical force instability.

There are methods to further lower the horizontal radius to about half the above that is CDI IP.

The foregoing assumes the belt transverse motion does not exceed 150 mm, beyond which it is restrained by side guide rollers. However, the more novel method does not have significant transvers motion, even with smaller radii. ■