Motorized Ring Grip- TJ101

The grip consists of two anvils 15mm diameter and 20mm wide. The anvils are mounted on shafts carried on ball bearings allowing the anvils to rotate. The lower anvil is driven by a small electric motor through a gearbox and is mounted to the lower anchor pin of the testing machine. The upper anvil is mounted to the loadcell of the testing machine and is free to rotate.
The lower anvil speed can be adjusted between 0 and 20 RPM. The speed control is mounted in a separate box, which can be positioned to suit the operator.
The grip is used to test loop samples such as ‘O’ rings or rubber bands. The sample is placed over both anvils and rotated by the electric motor while a tensile load is applied by the testing machine. In this way stress in the sample is equalized through its length .The grip can be used for applied forces up to 10 kN.

Maximum Load 0.5kN
Sample Size   The anvils can accommodate bands up to 20mm wide
Sample Type 'O' rings, rubber bands, strips cut from cylindrical items such as the fingers of rubber gloves.
Options  Alternative anvils available to suit customer requirements.

Dak offers a versatile system for tensile testing of rubber O-rings, featuring a special motorized ring grip in conjunction with a Universal Materials Testing Machine. O-rings are used for fluid and vacuum sealing in a host of industries including automotive and aerospace.

The motorized grip can accommodate bands up to 20 mm wide. The grip consists of two anvils mounted on shafts to allow rotation. The lower anvil is driven by a small electric motor and is mounted to the lower anchor pin of the testing machine. The upper anvil is mounted to the loadcell of the testing machine and is free to rotate.
The O-ring is placed over both anvils and rotated by the electric motor while a tensile load is applied by the testing machine. In this way stress in the sample is equalized through its length.

Tensile measurements can be used to monitor the quality and uniformity of O-rings. Three properties are typically measured: the force required to break the O-ring, the percentage elongation before breaking and the tensile breaking strength. Testing can be carried out both before and after immersion of the O-ring in the fluid to which it is providing the seal. This shows how the fluid environment can affect the material’s physical properties.