Multi-station access guarding in forklift logistics

The increasing automation of machines and systems places growing demands on safety concepts. Classic concepts such as muting are often pushed to their limits here. Our innovative safety solutions guarantee gapless safety, efficient material flow and high availability of your system, even with automatic processes. They also make a significant contribution to optimizing the overall process.

If industrial trucks - such as forklift trucks - are working at a transfer station to a hazardous area, reliable differentiation between forklifts and persons is necessary for access guarding. Common safety conecptes are often limited in theirs possibilities and require considerable design and process interventions for safe operation In practice, this can lead to compromises with correspondingly high residual risks, which also require a high degree of personal responsibility and discipline from the instructed operating personnel. For example, safety gaps may occur next to the forklift truck during handover, the system may have to be operated at reduced speed when approached, or the system may even have to be stopped completely during handover.
Our safety solution for multi-station access guarding in forklift logistics is specially optimized for these applications. It ensures gapless safety and at the same time guarantees high capacity utilization of the system through optimized processes.

 

Requirement:
Several transfer stations are located on a cross conveyor where material is fed in and out by forklift trucks. The entire transfer area is to be safeguarded against access by persons. When a forklift approaches, the corresponding station is to be released for entry.

Solution:
Safety laser scanners with vertically oriented protective field safeguard the access. For each station, additional sensors monitor the movement of the forklift trucks and forward the information to the safety system. The system adjusts the protective field for entry of a forklift truck into the respective station. The entire process is monitored for safety.

Operating principle:
The vertical protective field is installed in front of the hazardous area. Each station is additionally controlled by monitoring sensors. Only when a forklift approaches a station, the safety system releases a defined area in the protective field for precisely this station. All other stations remain safeguarded by the protective field. As soon as the forklift has left the transfer area, the protective field is reset to its original state. The forklift trucks can enter and exit without interruption and use all stations simultaneously and independently of each other.

Advantages for you

  • Save time and money with our pre-developed and process-optimized safety solutions
  • Continuous monitoring of the entire transfer area with reliable differentiation between forklift trucks and operators
  • Scalable to the number of stations in your facility
  • Safe separation of traffic area and transfer area allows further optimization of workflows
  • High reliability and availability
  • Optimum protection against manipulation

System components and safety parameters

  Safety sensor: RSL 400 safety laser scanner
Monitoring sensors: Ultrasonic and radar sensors
System control: Siemens SIMATIC S7
Leuze safety program
PL d in accordance with ISO 13849-1, SILCL 2 in accordance with IEC 62061
2-channel safety output

 



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