JPH069677B2 - Exciter of solid dynamic viscoelasticity measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an improvement of a vibration exciter used in a solid dynamic viscoelasticity measuring apparatus.

[Prior Art and Its Problems] Today, measuring the viscoelasticity of various rubbers, synthetic resins, etc. is a means of obtaining useful information for knowing the physical properties of various materials. It is widely known that it is more meaningful to know the physical properties under the change of.

In the conventional vibrator, as shown in FIG. 2, a spindle 1a is supported by a pair of spaced springs 1, a moving coil 2 is attached to one end of the spindle, and the moving coil 2 is opposed to the moving coil 2. The magnet 3 is arranged.
In this structure, if the natural frequency of the exciter is equal to or lower than the measurement frequency, the sample may be twisted or shaken depending on the shape or rigidity of the sample, and It was extremely difficult to measure the physical properties.

[Object of the Invention and Its Structure] The present invention aims to solve the above-mentioned problems, and in order to achieve this object, a fixed vibrator cylinder and a pair of vibrators fixed to the vibrator with a gap. Disc springs, a spindle extending through the centers of the disc springs, a moving coil mounted on the spindle between the disc springs, and fixed to the exciter barrel between the disc springs. ,
An exciter comprising: a ring-shaped magnet installed so as to face each other so as to cooperate with the moving coil.

[Operation and Effect] In the above arrangement, the actuating portion of the vibrator is all arranged between the disk-shaped springs, and the electromagnetic force generated by the cooperation of the moving coil and the magnet is transmitted only in the axial direction of the spindle. Therefore, horizontal runout of the spindle does not occur.

[Embodiment] An embodiment of the present invention will be described below with reference to FIG. 1 of the accompanying drawings.

Referring to FIG. 1, there is shown an exciter 10 according to the present invention, which exciter comprises a suitable exciter, for example an exciter barrel 14 secured to a mount 12 mounted on the floor. Includes. The exciter barrel 14 is of a substantially hollow cylindrical shape having a horizontal longitudinal axis and has an inwardly facing flange 16 at one end. Disc-shaped springs 18 and 20 are attached to the opposite end of the vibrator body 14 and the flange 16, respectively, to hold the metal fittings 22 and 2 together.
It is fixed by 4.

Each of the disk-shaped springs 18 and 20 has an opening at its center,
A spindle 26 extends through the opening, and the disc springs 18 and 20 support the spindle 26 extending through the center thereof.

A moving coil 28 is mounted on the spindle 26 adjacent to one of the disk-shaped springs 18 and inside thereof.
A ring-shaped magnet 30 is fixed to the flange 16 between the pair of disc-shaped springs 18 and 20 facing the moving coil 28, and the ring-shaped magnet 30 has its central longitudinal axis aligned with the longitudinal axis of the spindle 26. It is arranged so as to be coaxial with.

In this way, by disposing the moving coil 28 and the ring-shaped magnet 30 between the disk-shaped springs 18 and 20, the electromagnetic force generated by the cooperation of these is applied to the spindle 26.
Is transmitted only in the axial direction of the spindle 26, and the horizontal shake of the spindle 26 can be prevented.

According to another preferred embodiment of the present invention, the spindle 26
A differential transformer 32 is connected to one end (right end in the figure) located outside the vibrator body 14 of the differential transformer 3.
2 is useful for detecting the movement (displacement) due to the electromagnetic force generated by the moving coil 28.

In the structure of the present invention, the vibration transmitting spindle 26 extends through the shaker body 14, and the spindles 26 are spring-supported on both sides of the shaker body. Compared with the structure in which the vibrator body is provided on one side of 26 (FIG. 2), the lateral shake of the spindle 26 and the moving coil 28 can be significantly reduced, and stable operation can be expected.

According to still another preferred embodiment of the present invention, a spindle fixing member 34 is provided at one end of the vibrator body 14,
By fixing the spindle 26 in this way, not only dynamic measurement of solid viscoelasticity but also static measurement is possible.

[Brief description of drawings]

FIG. 1 is a partial sectional side view showing a vibration exciter according to the present invention. FIG. 2 is a schematic diagram illustrating the structure of a conventional vibrator. In the drawings, 10 ... Vibrator, 12 ... Mounting base, 14 ... Vibrator barrel, 16 ... Flange, 18,20 ... Disc spring, 2
2, 24 ... Holding metal fitting, 26 ... Spindle, 28 ... Moving coil, 30 ... Ring magnet, 32 ... Differential transformer, 34 ... Spindle fixing fitting.

Claims (3)

[Claims] 1. A fixed exciter barrel, a pair of disc-shaped springs fixed to the exciter at intervals, a spindle extending through the centers of the disc-shaped springs, and a space between the disc-shaped springs. And a ring-shaped magnet fixed to the vibrator body between the disk-shaped springs and facing each other so as to cooperate with the moving coil. Characteristic shaker. 2. The vibrator according to claim 1, wherein a differential transformer is connected to one end of the spindle located outside the vibrator barrel. 3. An exciter according to claim 1, wherein the spindle is fixed to an exciter barrel.