Vibration testing system

Abstract

A vibration testing system which can perform vibration test by vibrating a work with a long period and a large acceleration amplitude. A direct drive converter in the vibration testing system comprises a direct drive converter frame fixed to the frame of the vibration testing system, an input shaft pivotally supported rotatably for the direct drive converter frame and coupled with the rotating shaft of a servo motor, a square thread formed at least partially on the outer circumferential surface of the input shaft, a roller having a tubular surface abutting against the flank of the square thread, a roller unit having a rotating shaft embedded therein for pivotally supporting the roller rotatably through a cylindrical roller bearing which is substantially entirely contained in the groove ofthe square thread, a rail fixed to the direct drive converter frame and sliding the roller unit straight along the axial direction of the square thread, and an output shaft coupled with the roller unit directly or indirectly and supporting a movable table at the upper end thereof wherein the roller screwing together with the square thread moves along the groove of the square thread as the input shaft rotates, and the output shaft interlocked with straight movement of the roller unit along the rail also moves straight to move the movable table up and down.

Description

technical field [0001] The present invention relates to a vibration test device that converts reciprocating rotational motion from a motor into linear reciprocating motion by a linear converter, and vibrates a test object through the linear reciprocating motion. Background technique [0002] As a test device for applying tensile, compressive, bending loads, etc. to the object to be inspected (workpiece), as described in Japanese Patent Laid-Open No. 6-129969, a ball screw, which is a type of linear converter, is driven by a servo motor. The experimental setup is well known. In this test device, a ball screw is connected to the rotating shaft of a servo motor, a cross head (movable table) is attached to a ball nut engaged with the ball screw, and the ball screw is rotated by the drive of the servo motor. , to apply a load to the workpiece mounted on the crosshead and the fixed end. [0003] In such a testing device, if the servomotor is driven while periodically switching t...

AI Technical Summary

Problems solved by technology

Therefore, a vibration test device using a ball screw mechanism as a linear transducer cannot be used for a vibration test in which a workpiece is vibrated with a long axis period and a large acceleration amplitude.

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