Linear actuator, consisting of: • a long shaft section (20) which extends in the axial direction (X) and is designed with a roller conveyor (22), • a displacement module (30) which is mounted on the long shaft part (20) in an axial direction (X) in a
pendulum-like manner and is provided with a groove (31) complementary to the roller conveyor (22), wherein the roller conveyor (22) forms a load path with the groove (31), • a roller unit (40) which is arranged in the load path and comprises several roller parts (41) and several spacers (42), wherein a spacer (42) is inserted between all two roller parts (41), • a return
assembly (50) which is arranged on the displacement module (30) or connected to the load path and comprises a first return
pipe (51), a second return
pipe (52) connected to the first return
pipe (51), and a
return channel (53) passing through the first return pipe (51) and the second return pipe (52), wherein the
return channel (53) serves for the circulation of the roller unit (40), wherein the first return pipe (51) has a first connection side (512) and the second return pipe (52) has a second connection side (522), and the first connection side (512) of the first return pipe (51) presses against the second connection side (522) of the second return pipe (52), • at least one detection
assembly (60) which is attached to the displacement module (30) and to the connection point between the first connection side (512) of the first return pipe (51) and the second connection side (522) of the second return pipe (52) and to an outer surface of the first return pipe (51) and the second return pipe (52), and which can detect the changes in distance of the individual roller parts (41) and then output a corresponding
signal when the roller unit (40) rotates in the
return channel (53), and • a data interception unit (80) which is
signal-connected to at least one acquisition unit (60) in order to receive signals from the acquisition unit (60).