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AssigneeKistler Holding AG
InventorsPaul Engler, Rudolf Hans Haab
Estimating the term…
The test device for determining the friction and prestress values of screwed connections consists of a transportable device having a central support plate (1), whereby shearing force sensors and axial force sensors (7, 8, 11) are arranged on both sides of said plate. The sensors are screwed between an application plate (2) and a torque receptor plate (3) and can be replaced or provided with adapters (4, 5). The sensors (7, 8, 11) can be extension sensors or piezoelectric sensors. The amplifiers of the piezoelectric sensors can be miniaturized in such a way that they can also be placed in the central support plate (1). During tightening, the following values are determined: total torque Mtot, head friction torque MK, thread friction torque MG, prestress force Fz, to obtain the following values: thread friction value μG and head friction value μK.
Testing device for screw connections, consisting of screw holding means fitted with sensors, characterized by a sandwiched sensor carrier plate (1, 15) with sensor arrangements on both sides (7, 8, 11, 19, 20) being mounted on one base plate (10, 18) and constrained between the sensors (7, 8, 11, 19, 20) by torque introduction plates (2, 16) and torque sustaining plates (3, 17), detecting separately both the head and thread friction forces and the preload force.
Testing device for screw connections according to one of claims 1 to 5, characterized by electronic amplifiers being integrated directly in the sandwiched carrier plate (1, 15).
Dependencies are inferred from the claim text.