Project requirements · Mechanical
Continuous flexing, drag chain
The cable survives millions of bending cycles in an energy chain at a stated speed, acceleration and bend radius.
Open in the designer with this requirement
Constructions that meet it
- Fine-wire class 5 or 6 conductor: changes no layer: a property of the conductor. Class 6 (or 5) fine-wire conductor, short lay, bundle stranding, pressure-extruded sheath (class 6 copper). Drawbacks: Cost.
- PUR, TPU or TPE sheath: changes no layer: a property of the sheath compound. PUR or TPE sheath (or special PVC) (PUR / TPE). Drawbacks: PUR for oil and abrasion too.
- Tinned copper braid: changes the cable's layers. Braid screen with high flex life for servo cables (tinned Cu).
Writing a tender? Pro writes this requirement into your specification, ready to copy. Open in the designer with this requirement · See Pro
Tests
No international test method: specifications state this in words. Tests that exist:
- Maker test rigs (Lapp, igus chainflex): cycles in an energy chain at given travel, speed, acceleration and bend radius. Pass: Lapp ÖLFLEX CHAIN: 3 to 10 million cycles at 7.5 to 10 x D; Beckhoff example 5 million cycles, 240 m/min, 30 m/s², 7 x D
How specifications state it
Specified as cycles, minimum dynamic bend radius, travel length, speed and acceleration; maker tests, no IEC test.
Where it is asked for
- machine tools
- automation
- cranes
- robots
Sources
- Lapp ÖLFLEX CHAIN product pages (90 CP 10,000,000 cycles at 7.5 x D; 819 P 5,000,000 at 10 x D; 809 3,000,000 at 10 x D) (maker's catalogue)
- Beckhoff ZK4704-0424 motor cable (5 million cycles, 240 m/min, 30 m/s²) (maker's catalogue)