DYNAMIC SPLICE TESTING - DIN 22110, PARTS 1 & 2
This 6-pulley-machine is used for testing the dynamic splice strength of textile conveyor belts under pulsating load.
DYNAMIC SPLICE TESTING - DIN 22110, PART 3
In general, the splice is considered to be the weakest point on an endless conveyor belt. Statically, it is usually easy to achieve a tensile strength that corresponds to that of the belt.
For the optimum belt configuration and dependable continuous operation, however, another parameter is vital: the dynamic efficiency of the splice.
For many years now, all substantial major projects have been evaluated and configured based upon this criterion.
The fatigue strength of the splice is determined in accordance with section 3 of the DIN 22110 standard. Four endless belts are placed on the test conveyor, one after the other.
These test machines (see photos and videos) are located at the ITA Institute in Germany.
The belts are run until they break or at least until the reference number of 10,000 load cycles has been achieved. During each exactly determined saw-tooth patterned load cycle, the belt travels over the two drums 18 times. The drum size depends on the tested belt rating.
Running the test longer would not result in any additional findings.
The upper load is specified such that a specimen breaks after achieving a high number of load cycles and a further sample runs through at least until it has reached the reference load cycle number.
A Wöhler (S-N endurance) curve is created with the results for the four test belts. The dynamic efficiency of the splice is calculated from the maximum top load, at which the 10,000 load alternations are achieved.
In the DIN 22101 standard, which has been in effect since 2002 and being revised in 2011, the dynamic efficiency is taken directly into account when specifying the necessary belt tensile strength. In general, a high dynamic efficiency of the splice lowers the required belt breaking strength.
The machine on the bottom left is capable of testing up to
St 14000 conveyor belts.