Entry Looper in Steel Processing

During the galvanization process of steel, metal rolls pass through the accumulator (entry looper). This section spans multiple levels and regulates the flow and tension of the steel strips, ensuring a continuous and controlled feed. Personnel regularly need access to this area for specific tasks.

Step-by-step mGard interlock sequence ensures safe operator access in steel entry looper accumulator.

The Challenge

Previously, fixed guards were used, which operators would remove when access was required. This practice often resulted in damaged guards and exposed operators to hazards if the guards were not re-bolted properly. Hence, the customer upgraded to movable guards that require interlocks. In addition, due to the vast size of the area, running cables across multiple levels also presents challenges.

Entry loop in steel plant protected by durable mGard mechanical interlocks for safety and access control.
The Solution

mGard

Fortress proposed a trapped key system with mGard mechanical interlocks. A key-operated switch is used to isolate power to the machine. The transfer of the key to the key exchange device releases the access keys that allow opening the respective interlocks on the upper levels. The machine can restart only when the sequence is reversed.

Mechanical interlock
Hazardous energy isolation
Personnel key
Multi-person access
How it works

Step-By-Step Process

Additional Considerations

This solution successfully resolved a challenge for a specific customer. Fortress can accommodate alternative setups and/or multi-range options. Share your application details with us so we can design a bespoke solution to meet your needs.

Recommended Product Range

Why Mechanical Trapped Key?

In this application, a mechanical trapped key system based on the mGard range was chosen for a few reasons:

It enforces a sequence of events

While the key is removed, the energy source is prevented from being accidently turned on

It ensures that guards are closed before operations are allowed to resume

Another advantage of this solution is that by using mechanical interlocks it is possible to reach areas where wiring is impractical.

DM2 mGard unit mounted on gate in isometric view, showing mechanical trapped key interlocking.

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Entry Looper in Steel Processing