Under the control of the warehouse control system, the stacker automatically stores and takes out goods from the high shelf.  Photoelectric sensor is installed on the pallet to detect whether the appearance of goods is regular. If the appearance of goods is regular, the photoelectric sensor on the pallet will not be triggered and the stacker will not alarm.  If the shape of the goods is irregular, such as high, wide or long, the fork will trigger the photoelectric sensor when storing and taking out the goods, causing the stacker to give an alarm. The stacker will stop working and restart the stacker to put into operation after the user has sorted out the appearance of the goods.  

1、Introduction to photoelectric sensors

   Photoelectric sensor is an optical signal detection sensor and transform it into electrical signals, it can be used to detect the light intensity, light, radiation temperature, gas composition analysis, etc. Can be directly non-electricity of the change of the light, can also be used to detect the parts diameter, surface roughness, strain and displacement can be indirectly converted to light the non-electric quantity of change,  The photoelectric sensor has many characteristics, such as high performance, fast response and non-contact.  According to the different structure and principle of the photoelectric sensor, it can be divided into slot type photoelectric sensor, counter type photoelectric sensor, reflector type photoelectric sensor and diffuse reflection type photoelectric sensor.  

2、Working principle of cargo detection in stacking airborne cargo platform

   Stacker is a kind of fork cargo storage and handling of goods equipment, from the top shelf access unit of the goods is special crane, stacker is the core of the whole logistics elevated library equipment, through the manual, semi-automatic or fully automatic operation to achieve the goods moving from one place to another, and the goods are placed in stacking airborne goods stage,  It is necessary to test the position and height of the goods on the loading platform, and the handling can be started after the detection is qualified.  The goods detection device of the cargo platform on the pallet in the transportation line of logistics three-dimensional warehouse is a diffuse reflection photoelectric sensor component installed on the frame frame body of the cargo platform to detect the import side position, export side position, both sides position and height position of the goods on the cargo platform.  

3、Application and advantage of diffuse reflection photoelectric sensor in stacker 

   The diffuse reflectance photoelectric sensor assembly includes the inlet side diffuse reflectance photoelectric sensor assembly, the outlet side diffuse reflectance photoelectric sensor assembly, two groups of outer diffuse reflectance photoelectric sensor assembly and ultra-high diffuse reflectance photoelectric sensor assembly. The inlet side diffuse reflection type photoelectric sensor assembly and the outlet side diffuse reflection type photoelectric sensor assembly are respectively arranged at the inlet end and outlet end of the frame frame body.  The inlet side diffuse reflection type photoelectric sensor assembly and the outlet side diffuse reflection type photoelectric sensor assembly both include a plurality of diffuse reflection type photoelectric sensor, and the diffuse reflection type photoelectric sensor is installed on the frame frame body through the bracket assembly. The two sets of outer diffuse reflection type photoelectric sensor assembly both include a plurality of diffuse reflection type photoelectric switch.  In addition, the diffuse reflection type photoelectric switch is installed on the outside of the frame frame body through a bracket, in which the ultra-high diffuse reflection type photoelectric switch assembly includes multiple diffuse reflection type photoelectric sensors, and the diffuse reflection type photoelectric sensor is installed on the frame frame body higher than the goods through a bracket.  

   By cargo platform frame of diffuse reflection type photoelectric sensor installed on the frame body components, to achieve the position on the inlet side of the cargo on the goods, the export side, on both sides of the location and height position detection, effectively avoid the correlation type sensor transmitter and the receiver position deviation caused by the disadvantages of test failure, without frequent correction to detect the position of the switch,  The frequency of equipment maintenance is reduced, the efficiency of equipment maintenance is improved, and the accuracy and effectiveness of goods inspection are guaranteed.