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Figure 1 Schematic diagram of the application of the shielding function light curtain on the conveyor line
Personal protection for the entrance and exit is usually a safe light curtain solution. The safety light curtain usually consists of a transmitter and a receiver. The transmitter emits a set of parallel infrared rays, which are received by the receiver. When a person or an obstacle intercepts the light, the safety light curtain outputs a signal to the mechanical device, the mechanical device. Stop work immediately, thus effectively protecting the safety of workers.
With the continuous application of information technology and automatic control technology, logistics equipment is developing rapidly in the direction of automation, information and intelligence. However, more and more automation technologies bring faster, more accurate and more stable logistics equipment, but also bring certain security risks to the production site.
Security risks
When the product enters and exits the automatic cartoner or labeling machine, there are certain safety hazards when the pallets and the totes are moved in and out of the automatic warehouse and at the entrance and exit of the conveyor line. Since the machines are in high-speed operation, if there are people entering the site, the machine and the automatic warehouse will cause very serious personal injury. The traditional safety protection measures are often to install mechanical fences or photoelectric protection devices on the periphery of the machine. Although this method can effectively protect most of the dangerous areas, the protection of the entrances and exits of the conveyors entering or leaving the machine or warehouse is weak. It has not caused enough attention.
Safety light curtain
Personal protection for such entrances and exits usually uses a safety light curtain solution. Safety light curtains, also known as safety light barriers, are usually composed of a transmitter and a receiver. The transmitter emits a set of parallel infrared rays that are received by the receiver. When there is a person or an obstacle blocking the light, the safety light curtain outputs a signal. For mechanical equipment, mechanical equipment immediately stops working, thus effectively protecting the safety of workers.
Figure 2 DATASENSOR introduces L-type and T-type modular safety light curtains
However, the normal function safety light curtain can't do anything for the safety protection of the entrance and exit, because when the person and the normal goods pass, the light of the safety light curtain is also blocked, and the controller can't distinguish whether it is normal production or dangerous situation, so it can't be played. Protective effects.
With the development of the technology of the safety light curtain, the light curtain shielding technology (Muting) has appeared, and the light curtain integrated with the shielding function can temporarily disable the function of the light curtain through the signal input of the external sensor, so that when the goods or the tray enters the light curtain Before the detection area, the two photoelectric sensors first detect the goods and output signals to the safety light curtain. The safety light curtain determines whether it is necessary to temporarily shield the light curtain function from passing the goods. Figure 1 shows the application of the shielding function light curtain on the conveyor line. In the figure, A1, A2, B1, and B2 are respectively four sets of photoelectric sensors. Since the running speed and length of the pallet differ greatly from the human, the positional parameters D and d1 of the photoelectric sensor installation are calculated by the length L of the pallet or the cargo and the running speed V. This ensures that the photoelectric sensor gives different logical combinations when the goods and people pass the conveyor line. The light curtain judges whether to shield the light curtain by judging the output signal of the photoelectric sensor, and lights up if the light curtain is shielded. The indicator light is shielded to alert the operator that the light curtain is temporarily blocked.
The combination of a safety light curtain with a shielding function and a photoelectric sensor can effectively solve the safety problem existing in the logistics conveying equipment, but since the field operator is not a professional safety expert, it is often impossible to accurately determine the installation position of the photoelectric sensor, so that It has laid a certain safety hazard for the entire equipment. At the same time, the wiring of the field becomes more complicated and error-prone due to the increase in photoelectric sensors.
Easy to use safety light curtain
Based on the increasing number of logistics equipment customers need easy-to-use safety light curtains, DATASENSOR has introduced L-type and T-type modular safety light curtains, and Figure 2 shows the structure of these two light curtains.
This light curtain integrates the photoelectric sensor into one or two lateral light curtains to form an L-shaped or T-shaped light curtain. The advantage of this light curtain is that the photoelectric sensor is modularized, eliminating the need for complex field calculations and installations, and the dedicated cable makes the connection of the lateral light curtain to the main light curtain simpler. In this way, the user only needs to install the light curtain on the spot as if the ordinary light curtain is installed, and realize the security protection with the shielding function.
When the on-site production process or process changes, the modular lateral light curtain can be increased or decreased according to the flow direction of the on-site cargo, and the position can also be flexibly adjusted. The adjustment of the light curtain function only needs to pass the toggle switch in the light curtain. To be done. At present, this kind of light curtain has been widely used in many automatic conveying equipment and automated warehouses in Europe. Figure 3 shows the application of the L-shaped light curtain in the automatic palletizing equipment and the T-type light curtain in the entrance and exit of the auto-stereo warehouse.
Fig. 3 Application of L-type light curtain in the entrance and exit of automatic palletizing equipment and T-type light curtain in auto-stereo warehouse
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