The physical structure of the safety touch edge is the basis for accurate detection, and is usually composed of an outer elastic material and an internal sensor element:
Outer elastic material
Mostly made of wear-resistant and extrusion-resistant rubber or silicone, it has a certain elastic deformation ability. When the touch edge is squeezed by external force (even a slight contact), the outer material will deform and transfer the force to the internal sensor element to ensure the sensitivity of "touch trigger".
Internal sensor element
Depending on the detection principle, there are two common sensor elements:
Conductive rubber/metal contact: The interior contains two parallel conductive rubber strips (or metal contacts), and the two keep a gap (non-conductive) under normal conditions; when the outer layer is compressed and deformed, the two conductive rubbers contact and conduct to form an electrical signal path.
Air pressure/hydraulic pressure sensor: The interior is a sealed air/liquid pipe with a pressure sensor. When under pressure, the pressure change in the pipe is captured by the sensor and converted into an electrical signal.
Both structures can directly change the sensing state through physical contact to avoid "missed detection".
