A Large Tabletop Electric Vibrator

Abstract

A large-table electric exciter comprises a table body, an excitation coil, a moving coil and an upper guide device, wherein the moving coil is composed of a moving coil frame and a driving coil. The large-table electric exciter is characterized in that the radial size of a worktable is larger than that of a surrounding frame, so that the moving coil frame is shaped in an inverted frustum which is big end up, a table reinforcing ring is arranged around the circumference of the periphery of the bottom surface of the worktable, a plurality of table reinforcing ribs are arranged in the table reinforcing ring on the bottom surface of the worktable, rotate by equal angles around the central axis of the moving coil frame and are arranged radially. Guide plates are connected among various adjacent rib plates, the tops of the guide plates are vertically arranged up and down and perpendicular to the table reinforcing ribs, and the upper edges of the guide plates are integrally connected with the bottom surface of the worktable. Triangular support plates are arranged in the middles of the inner sides of the guide plates. Testing of large-size test pieces can be met without additionally arranging an expanding table and high testing frequency and order are guaranteed.

Description

technical field [0001] The invention relates to a mechanical environment test equipment, in particular to a large table electric vibrator. Background technique [0002] In the prior art, the electric vibrator is mainly composed of a table body, an excitation coil, a moving coil, an upper guide device, a lower guide support device and the like. The moving coil is composed of a moving coil frame and a driving coil, and one end of the moving coil frame is a working table for installing the test piece. The table body is composed of a magnetic cylinder ring, a central magnetic pole, an upper pole plate, a lower pole plate, an upper cover and a bottom cover. Its working principle is: the excitation coil generates a fixed magnetic field with a DC current, and generates an exciting force on the moving coil installed in the magnetic field with a current passing through it. When the driving coil is passed with an alternating current, the moving coil produces a corresponding alternati...

AI Technical Summary

Problems solved by technology

[0005] This has two obvious disadvantages: . The natural frequency of the vibration system will drop significantly when the extended table is installed, so the maximum test frequency of the vibration system will also drop; .Install the extended table, the effective mass of the vibration test will increase, so that it is equal to the same mass of the test piece, and the magnitude of the acceleration test will be reduced

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