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Testing Extremes
Altracon successfully took the challenge to build a heavy duty tire test stand
(September 2016)

Altracon recently handed a 2 Pos. Agricultural Tire Endurance Testing Machine over to a customer. It is designed to take tires up to 2.500mm diameter with 20t wheel load capability each. A big, heavy duty machine with multiple built in design- and functionality-features such as Rolling Resistance-, Plunger- and Footprint- Testing capabilities, combined with incredible performance values. Such test stands are by far not built everyday but this was already the second test stand for extreme tire testing which was delivered within this year.The experiences from the first project, an aircraft tire test stand with anding simulation, were helpful to get this project successfully realized in shortest period of time.

The test machine is subdivided in the centre-module with the drum and drive and the load stations, which are attached to move the wheel radially to the drum. The mechanical interface is standardized. The module has an own rigid frame. The load unit is precisely and rigidly mounted to the centre-module with the 3.000mm drum. The drum is driven by a high performance AC servo motor with direct drive torque transmission. The test-wheel axis is equipped with a spin lock-/ brake system. Different test rims are adapted with adapter rings available for each wheel spindle.
The wheel load is applied and measured directly in the vertical wheel axis, which keeps the wheel carrier free from bending torque. High precision linear guides care for smooth motion of the wheel carriers and contribute to best control performance with highest accuracy. A new reinforced bulge detector system is installed at each wheel carrier, it cares for emergency unloading of the test position in case of a fault detection. The installed Rolling Resistance Measurement System uses a precision torque-meter, which is installed in the drive axle. This method has a large and constant lever-arm for sensitive measurements and works independent from the rolling direction. A foldable platform for ink-footprint applications can be mounted at the center module and will be clamped to the drum. The drum is then locked for spinning. The platform offers a flat and vertically adjusted surface to load the wheel/ tire to take the footprints. Paper is kept in position with magnets. The same platform will be used to hold a plunger pin for plunger testing. For safety reasons will the plunger test be automatically performed after the machine has been taught the test positioning.

The severe overall testing conditions require an operation of the test stand in a closed and explosion protected room to be save.An intelligent camera system is installed to monitor the test, to support during the adjustment process and even detect visible irregularities to trigger for sending a message tothe mobile phone of the operator during his absence if something unforeseen happens.

The “big brother”, a reinforced version of the test stand with 30t wheel load is in the design phase. It shall start operation in 2017.