Loma IQ3+, Руководство пользователя

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Installation
34
Mounting a Detector Head onto a Conveyor
Introduction
Loma Systems have been manufacturing metal detector systems for many years and our current
conveyor design incorporates this wealth of experience. There are a number of integration rules that
have to be followed when fitting a new detector head to an existing or third party conveyor to attain
optimal performance and avoid nuisance triggering.
Basic Rules
1. The conveyor must be substantial and of welded not bolted construction.
2. The conveyor must have a means of height adjustment to level it to any infeed or outfeed
conveyor systems and also to take out any unevenness of flooring. This is to provide conveyor
stability.
3. No fixed metal is allowed nearer to the detector aperture than a distance of 1.5 times the
smaller of the two aperture dimensions.
4. No moving metal is allowed nearer to the detector aperture than a distance of 3 times the
smaller of the two aperture dimensions.
5. The detector head must be mounted on the conveyor using the supplied mounting kit.
6. The conveyor belt must be of a non metallic construction. The joint if applicable shall be heat
sealed or vulcanised. Angled joints are preferred where possible, as are finger joints for thicker
belts. Where modular belts are used, joining rods must be non metallic.
7. Rollers should be of a substantial construction to prevent bowing and crowned where
applicable to help belt tracking on non modular belting.
8. Rollers can be PVC coated steel or aluminium or manufactured in a good quality stainless
steel.
9.
Rollers must be insulated from the main conveyor frame on at least one end to prevent the
formation of eddy current loops as these can cause the detector to false trigger.
10. The conveyor belt must be supported through the detector aperture by a non metallic support
such as a phenolic plastic or nylon strips. Whatever is used, it must be strong enough to
support the intended product and not bow under the product weight.
11. Electrical interference: The reject relay usually switches inductive loads such as motor starter
contactors and solenoid valves for air operated rejects. Its important that suitable suppressors
are fitted to these devices.
12. Pack presentation: Consistent pack presentation is important to ensure optimal detection
performance. Non Metal guides should be fitted to make sure that products do not randomly
twist as they pass through the aperture. In the diagram below, where blue is good and red is
bad, you can see that good guiding should present products correctly.