MineWATCH - Digital Sequence and Slip Roller for Conveyor Systems

FromDavis Derby Ltd.

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The Davis Derby MineWATCH Digital Belt Sequence and Slip Roller is engineered for enhanced conveyor management by facilitating easy sequencing and precise belt slip detection. Designed to mitigate spillage and provide early warnings of potential belt fires, the system features two models: a cantilever type for fully-loaded belts and a bottom belt type for integration adjacent to conveyor structures. In operation, the system employs a magnetic induction linkage to actuate an internal switch, with dual-directional switch contacts responding at preset speeds. It complies with ATEX EN 60079-11:2012 standards for intrinsically safe equipment, allowing it to safely manage circuit voltage and current parameters. Installation is simplified with a robust steel casing, offering convenient access to cable connections and speed adjustment settings. The cantilever model includes a sealed self-aligning bearing, while the bottom belt variant features sealed bearings at both ends, ensuring durability and reliability in demanding industrial environments.

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Davis Derby MineWATCH technicians designed the Digital Belt Sequence and Slip Roller to make conveyor sequencing easy and detect belt slip. As well as preventing spillages from your conveyor system, this module can also give early warning of potential belt fires.

MineWATCH manufactures two types of conveyor sequence and belt slip roller. They can be used to provide a simple means of conveyor sequence control and also for belt slip detection:

One version is a cantilever type for mounting under the top belt such that it operates when the belt is fully loaded. The other version is a bottom belt type and is designed to fit adjacent to the conveyor structure such that the three drive rollers are in contact with the flat underside of the conveyor belt. This unit can be installed to replace a conventional belt roller and should be installed to give maximum purchase between the conveyor belt and the drive rollers.

Operating Principals
When the conveyor is in motion, a magnetic induction linkage is operated to activate the internal switch via a coupling. There are two sets of switch contacts, one for each direction and at a predetermined speed, set by the adjusters inside the unit, one of the sets of contacts operates depending on the direction of travel.

Cable entries
The unit is supplied with one CM 20 20mm cable gland and one 20mm tapped blanked off entry.

Certification
The Conveyor Sequence and Slip Roller unit is deemed intrinsically safe to the ATEX standard EN 60079-11:2012 Explosive Atmospheres-Part 11:Equipment protection by intrinsic safety ”i” section 5.7 ‘Simple Apparatus’.

The switch contacts can be used to switch an intrinsically safe circuit with the following
characteristics:

Ui max = 50 volts; Ii max = 100ma.

The unit incorporates a magnetically coupled switch enclosed in a robust steel case with a removable cover. This provides ease of access for installation of the incoming cables and the speed adjustment setting which determines the speed at which the contacts operate. The cantilever type has a sealed self-aligning bearing at the drive end of the shaft, whilst the shaft of the bottom belt type is supported by sealed self-aligning bearings at each end of the shaft.