Modern intelligent injection molding workshops are equipped with a large number of servo motors, frequency converters, robotic arms, high-power heating equipment and automated control systems, which generate strong electromagnetic radiation and alternating magnetic field interference in the working environment. Ordinary unshielded thermocouple cables cannot resist external electromagnetic clutter interference, resulting in distorted temperature signals, unstable PID regulation and unbalanced hot runner temperature field. Shielded thermocouple cables have become essential supporting accessories to ensure accurate temperature measurement in intelligent workshops.
The shielded cable adopts a layer of metal braided shielding mesh outside the internal signal wire, which can effectively isolate external electromagnetic wave radiation, block the coupling interference of high-current power lines and servo cables, and prevent clutter signals from superimposing on the weak millivolt-level thermoelectric potential signal. Under strong electromagnetic interference environment, unshielded cables often appear temperature jumping, floating and irregular fluctuation, while shielded cables maintain stable signal transmission and accurate temperature display.
In terms of wiring layout, intelligent workshops have dense circuit pipelines, and thermocouple signal wires inevitably lay in parallel with high-power lines for a long distance. Shielded structure can eliminate electromagnetic induction interference generated by parallel wiring, avoid common-mode signal noise, and ensure that the controller collects real and effective temperature data. With one-end standard grounding of the shielding layer, the anti-interference effect is further optimized, avoiding ground potential difference interference and forming a pure signal transmission channel.
In addition, the shielded outer braided layer also has mechanical protection functions such as wear resistance, compression resistance and tensile resistance, protecting the internal insulation layer from friction damage and extending the service life of the wiring harness. For automated unmanned production lines and intelligent centralized control workshops, the stability of thermocouple signals is related to the automatic operation logic and mold safety protection. Adopting fully shielded thermocouple cables is a basic low-cost measure to eliminate electromagnetic interference, stabilize hot runner temperature control and ensure the normal operation of intelligent production lines.
