JP2542162B2 - Torsional vibration device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torsional vibration device which converts bending vibration into rotational vibration.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 4-29280, Japanese Patent Publication No. 5
No. 13401 and Japanese Patent Publication No. 5-20693 disclose a piezoelectric torsional oscillator which forms a bonded body of a vibration plate and a piezoelectric ceramic and causes torsional vibration by applying a voltage to the piezoelectric ceramic. In these, one end and the other end of the piezoelectric type torsional vibrator are rotationally vibrated in opposite directions, that is, torsional vibration is generated as a whole, and the vibrating or density detector is rotationally vibrated by using this as a driving source.

[0003]

However, since the rotational vibration angle (vibration amount) obtained by the torsional vibrator made of the above-mentioned bonded body has a structural upper limit, its application range is limited. However, it is difficult to form a measuring instrument that can stably handle a wide range of measurement liquids, for example, from high viscosity to low viscosity.

[0004]

As a means for solving the above problems, the present invention uses, as a starting source, a flexural vibration plate that flexibly vibrates, and is provided at both ends of a line diagonally traversing the flexural vibration axis of the flexural vibration plate. Rotation in which one end of a torsional vibrating member that mutually twists and vibrates according to the flexural vibration of the flexural vibrating plate is coupled, and the other end of both torsional vibrating members is rotationally vibrated with the torsional vibration of the torsional vibrating member A torsional vibration device characterized by being connected by a vibrating member is configured so that the rotational vibration of the rotational vibrating member can be used as an output source.

The bending diaphragm has an axially symmetric shape, and the axis of symmetry is a vibration axis, and both ends of the bending diaphragm vibrate and vibrate in the thickness direction about the vibration axis. The rotary vibration member is a member that has a straight line perpendicular to its surface as a vibration axis and that vibrates rotationally around the vibration axis.

Each of the torsional vibration members is a columnar body such as a cylinder or a prism, and one end of each torsional vibration member in the longitudinal direction is coupled to both ends of a line diagonally intersecting the vibration axis of the flexible diaphragm. The other ends of the torsional vibration members in the longitudinal direction are respectively coupled to the rotary vibration member, so that the flexural vibration plate and the rotary vibration member are concentrically arranged and connected so as to face each other in parallel. ing.

Thus, the flexural vibration plate, which is the input source, is caused to generate flexural vibration to impart torsional vibration to the pair of torsional vibration members, and the torsional vibration causes the pair of torsional vibration members to rotate together with the rotary vibration member. The rotary vibration member that is the output source is rotationally vibrated by the rotary vibration force applied to the connecting portion.

[0008]

According to the present invention, by arbitrarily selecting the distance between the flexural vibration plate and the rotary vibration member, that is, the length of the torsional vibration member connecting them, a small flexural vibration is used as an input source and a larger rotary vibration is output. It will be possible to obtain it, and the range of its application will be remarkably expanded.

Further, in the existing technology, it is relatively easy to construct a vibrator that uses piezoelectric ceramics to induce a large bending motion as compared with a torsional vibrator, and a large bending vibration can be expected as a starting source. The present invention can output a larger rotational vibration.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIGS. 1 to 3, this torsional vibration device has a bending vibration plate 1 as an input source and a rotary vibration member 2 as an output source.

The flexural vibration plate 1 flexurally vibrates at both ends or in the thickness direction about the flexural vibration axis Y, and the flexural vibration plate 1 and the rotary vibration member 2 are arranged so as to face each other with a required gap. Both 1 and 2 are connected by torsional vibration members 3a and 3b.

One ends of the torsional vibration members 3a and 3b are connected to both ends of a line L diagonally intersecting with the bending vibration axis Y of the bending vibration plate 1. Preferably, a symmetrical position on the line L about the intersection O of the flexural vibration axis Y and the line L (the connecting points P1, P
In 2), one ends of the torsional vibration members 3a and 3b are rigidly connected to the flexural vibration plate 1, and the connecting points P1 and P2 are located on the line L where the angle α formed by the flexural vibration axis Y and the line L is 45 °.
To place.

As an example, the flexural vibration plate 1 is formed of a circular metal plate 1a, and one circular diameter of the circular metal plate 1a is defined as the flexural vibration axis Y, and the left and right semi-circular plate portions separated by the axis Y are provided. Is vertically vibrated about this axis Y and vibrates. The line L exists between the bending vibration axis Y and a line X orthogonal to the bending vibration axis Y and is inclined at the angle of 45 °.

The rotating surface of the rotary vibration member 2 and the flexural vibration plate 1 are connected by the torsional vibration members 3a and 3b so as to be concentric with each other and face each other in parallel. As an example, the torsional vibration members 3a and 3b are arranged substantially perpendicular to the facing surface. Further, the cross-sectional shape of the torsional vibration members 3a, 3b is selected to be circular, quadrangular or the like, and is formed in a columnar body as shown in the drawing.

In addition to the circular shape shown in the drawing, the outer shape of the flexural vibration plate 1 has an axially symmetric shape having a center such as a rectangle, and the axis of symmetry is defined as the flexural vibration axis Y, and the flexural vibration axis Y is the center. Both ends bend and vibrate in the thickness direction.

The outer shape of the rotary vibration member 2 is not limited to the circular shape shown in the figure, but is preferably an axially symmetric shape having a center such as a rectangle. A straight line perpendicular to the center of the surface is the rotary vibration axis Z, and the axis Z Rotate and vibrate around.

A thickness vibrating piezoelectric plate 4 shown in FIG. 5 is used as a means for flexurally vibrating the flexural vibration plate 1. In this piezoelectric plate 4, for example, piezoelectric ceramics having electrode layers on the front and back surfaces are laminated in a single layer or in a plurality of layers as shown in the drawing, and the thickness of the piezoelectric ceramic is changed by applying a voltage to each electrode layer
The thickness vibrates.

As a means for converting the thickness vibration into the flexural vibration of the flexural vibration plate 1, the surface of the piezoelectric plate 4 vibrating in the thickness vibration on the side on which the torsional vibration device is arranged is supported by the pressurizing body 5, and at the opposite side. A fixed pressure receiving body 6 which also serves as a weight and does not have flexibility is laid on the surface, and a pressing rod 7 penetrating the center of the piezoelectric plate 4 between the pressure applying body 5 and the pressure receiving body 6 is used to center the two. A pressurizing unit 8 that is connected to the portion O and that supports the flexural vibrating portion of the flexural vibration plate 1 is provided on the pressurizing body 5. As shown in FIG. 6, the pressing portion 8 is arranged symmetrically with respect to the bending vibration axis Y. Preferably, the pressurizing section 8 is extended so as to be parallel to the vibration axis Y.

When the piezoelectric plate 4 vibrating in the thickness direction in FIG. 5 vibrates in the thickness direction as shown by the arrow in the drawing, the bending force is applied to the center of the vibrating plate 1 via the tightening rod 7 in the thickness direction. The output and the output alternately act, and as a result, as shown in FIGS. 4B and 4C, the diaphragm 1 is caused to generate flexural vibration under the pressure applied by the pressure unit 8.

When the flexural vibration plate 1 flexurally vibrates, a torsional vibration force is applied to the connecting portion of the torsional vibration members 3a and 3b by the arrangement using the vibration source as an input source, and they are mutually vibrated by torsion.

As a result, a rotational vibration force is applied to the connecting portion between the rotary vibration member 2 and the torsional vibration members 3a and 3b, and the rotary vibration member 2 as an output source is rotationally vibrated about the rotary vibration axis Z. The rotary vibration member 2 is used as a drive source to rotationally vibrate the drive target 11.

For example, the detector 10 of the measuring instrument is attached to the end of the shaft 9 connected to the center of the rotary vibration member 2, and this is vibrated in the measurement liquid in the circular direction for detection of viscosity or density.

As another example of the flexural vibration source of the flexural vibration plate 1, as shown in FIG. 7, a piezoelectric plate 12 which is expanded and contracted in the lengthwise direction by voltage driving of a piezoelectric ceramic or the like is attached to the vibration plate 1 as shown in FIG. The piezoelectric plate 12 is driven to expand and contract by voltage driving to cause the vibration plate 1 to flex and vibrate, and using this as an input source, the same operation as above is induced.

[0025]

According to the present invention, a small flexural vibration can be used as an input source and a larger rotary vibration can be obtained as an output by arbitrarily selecting the length of the torsional vibration member that connects the flexural vibration plate and the rotary vibration member. It becomes possible, and the range of its use can be greatly expanded.

Further, since it is easy to construct a vibrator having a large flexural vibration as a starting source by the existing technology, a larger vibration amount, which has been conventionally difficult due to the cooperation with the torsional vibrator of the present invention, can be obtained. It is possible to output rotational vibration having a vibrating force.

[Brief description of drawings]

FIG. 1 is a perspective view of a torsional vibration device showing an embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a plan view of the same.

4A to 4C are side views illustrating a torsional vibration operation associated with flexural vibration of the torsional vibration device.

FIG. 5 is a side view of the apparatus showing an example of bending vibration means for bending and bending a bending diaphragm in the apparatus.

6 is a cross-sectional view taken along the line AA in FIG.

FIG. 7 is a side view of the apparatus showing another example of the bending vibration means.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flexural vibration plate 2 Rotational vibration members 3a, 3b Torsional vibration member 4 Thickness vibrating piezoelectric plate 12 Piezoelectric plate Y Flexural vibration axis Z Rotational vibration axis P1, P2 Connection point of torsional vibration members

Claims (1)

(57) [Claims] 1. A pair of torsional vibrating members formed of a columnar body, and a flexural vibrating plate which has an axially symmetric shape and whose vibrating axis is a vibrating axis and whose both ends flexurally vibrate in the thickness direction. And a rotary vibrating member having a straight line perpendicular to the surface as a vibrating axis and rotating and vibrating about the vibrating axis, one end of each torsional vibrating member in the longitudinal direction is oblique to the vibrating axis of the flexible diaphragm. It is connected to both ends of the intersecting line,
In addition, the other end of each torsional vibration member in the longitudinal direction is coupled to the rotary vibration member, so that the flexural vibration plate and the rotary vibration member are concentrically arranged and connected so as to face each other in parallel. , The torsional vibrations are applied to the pair of torsional vibration members by generating bending vibrations in the bending vibration plate that is an input source, and the torsional vibrations are applied to the connecting portion between the pair of torsional vibration members and the rotational vibration member. A torsional vibration device, characterized in that a rotational vibration member, which is an output source, is rotationally vibrated by a rotational vibration force.