The core structure of robot specific cables

2026-04-13 16:30:15

The industrial robot specific drag chain cable is a system engineering tailored for "millions of bends" from the inside out:

1. Conductor: 0.08mm grade ultra-fine copper wire+layered stranded

We use ultra-fine oxygen free copper wire that complies with VDE 0295 Class 6 or IEC 60228 Class 6 standards, with a single wire diameter controlled between 0.08-0.12mm. Through multi-layer reverse layered twisting (inner layer right twisting, outer layer left twisting), short pitch precision twisting, and annealing softening treatment, the copper wire "slides and disperses stress" during bending, rather than "rigid friction fracture".

The direct benefits brought by this structure are: the flexibility is increased by more than three times under the same cross-sectional area, and the bending life is increased from "tens of thousands of times" of ordinary cables to 8-20 million times.

2. Insulation: high elasticity TPE/special PVC

Abandon hard PVC and switch to modified TPE (thermoplastic elastomer) or special PVC blends. This type of material has a soft texture, fatigue resistance, and is not brittle at low temperatures. When the conductor is bent, the insulation layer synchronously deforms and does not become brittle or pull the copper wire.

3. Cable formation: pitch optimization+flexible filling+tensile reinforcement

Paired/bundled short pitch twisted core wires, with internal reserved activity allowance; Using PP elastic filling and non-woven fabric cushioning to prevent the core wires from squeezing and rubbing against each other during bending; The aramid tensile yarn (Kevlar) that runs through the entire cable shares the tensile force during bending and stretching, avoiding the conductor from being stretched and broken.

4. Shielding: Double layer structure ensures signal purity

For signal lines such as servo, encoder, and bus communication, a double-layer shielding of "aluminum foil wrapping+tinned copper mesh weaving" is used, with a coverage rate of ≥ 85%. The shielding attenuation in the 30MHz-1GHz frequency band can reach more than 60dB, and some high-performance models can reach 80-95dB. This "electromagnetic protective cover" is the core to ensure signal stability.

5. Sheath: PUR polyurethane becomes the preferred choice for industrial grade

The outer sheath material directly determines the lifespan of the cable under harsh working conditions. PUR (polyurethane) sheath has become the mainstream choice in industrial environments due to its excellent wear resistance, oil resistance, and UV resistance. Test data shows that the wear resistance of PUR sheath can reach 5-6 times that of ordinary PVC, and it performs outstandingly in harsh working conditions such as oil stains, dust, and metal debris splashes.

Within a wide temperature range of -40 ℃ to+105 ℃, PUR remains flexible and non hardening, suitable for all scenarios from outdoor ports in northern winter to high-temperature processing workshops in southern China.