JP2002296103A - Vibration sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration sensor which can be easily and promptly detached from a measuring object without endamaging the object's appearance. SOLUTION: A penetrating screw hole 7 is provided on a mounting surface 2d. By screwing a hexagon socket head bolt 10 into the screw hole 7 and making the tip of the bolt 10 abut on the measuring object 6, cleavage force is generated between the mounting surface 2d and adhesive 9, or between the adhesive 9 and the measuring object 6, enabling to detach a piezoelectric acceleration pickup 1 from the measuring object 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration sensor for detecting vibration by bonding it to an object to be measured.

[0002]

2. Description of the Related Art Conventionally, as a method of removing a vibration sensor for detecting vibration by bonding and fixing the same to an object to be measured with an adhesive or the like, a method of twisting a side of the vibration sensor by sandwiching the side of the vibration sensor with a spanner, Method of inserting a screwdriver into the gap formed in the adhesive surface with the object to be measured and peeling it off, Heating the adhesive surface to degrade the adhesive and reducing the adhesive strength, then removing with a tool, Dedicated removal tool There is a method of removing using a method.

[0003]

However, in the conventional method, there is a problem that the side surface of the vibration sensor is scratched and its appearance is remarkably impaired, or the mounting surface is deformed and affects the performance of the vibration sensor. This may occur. Also,
When the vibration sensor is bonded and fixed in a narrow space, a tool for removal may not be used. Further, since a special removal tool must be prepared, the usability is poor.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to easily and quickly remove an external shape from a measurement object without damaging the external shape. It is intended to provide a vibration sensor.

[0005]

In order to solve the above-mentioned problems, the invention according to claim 1 has a mounting surface for an object to be measured, and this mounting surface is adhered and fixed to the object to be measured to detect vibration. In this vibration sensor, a threaded hole is provided in the mounting surface, a bolt is screwed into the threaded hole, and the tip of the bolt is abutted against the object to be removed from the object to be measured.

According to a second aspect of the present invention, in the vibration sensor according to the first aspect, a relief portion is provided on the mounting surface around an opening of the screw hole.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a perspective view of a piezoelectric acceleration pickup to which the present invention is applied, FIG. 2 is a side view of a piezoelectric acceleration pickup bonded and fixed to an object to be measured, FIG. 3 is an operation explanatory view, and FIGS. It is a side view (a) and a front view (b) of another embodiment.

As shown in FIGS. 1 and 2, a piezoelectric acceleration pickup 1 to which the present invention is applied has a case 2 formed in a substantially rectangular parallelepiped shape,
Detectors 3, 4, and 5 are provided to be exposed on the side surfaces 2 a and 2 b and the upper surface 2 c in the directions (X, Y and Z), respectively.
Further, the case 2 is provided with screw holes 7 vertically penetrating the upper surface 2c and the bottom surface (mounting surface) 2d which is parallel to the upper surface 2c and is adhered and fixed to the measurement object 6 so as to avoid the detection units 3, 4, and 5. And provided at two places at the ends.

The detection units 3, 4, and 5 are composed of a piezoelectric element bonded and fixed to a base member (not shown) and a weight bonded and fixed to the piezoelectric element. In addition, 8 is the detection units 3, 4,
Reference numeral 5 denotes a receptacle for extracting an electrical signal output according to the magnitude of the acceleration, and reference numeral 9 denotes a cyanoacrylate-based or epoxy-based adhesive for bonding and fixing the piezoelectric acceleration pickup 1 to the object 6 to be measured.

An operation of detaching the piezoelectric acceleration pickup 1 configured as described above from the measuring object 6 will be described. As shown in FIG. 3, a bolt 10 such as a hexagon socket head bolt which is screwed into the screw hole 7 and has a thread longer than the thickness of the case 2 in the Z direction is prepared.

First, the bolt 10 is screwed into one of the screw holes 7 in the direction of arrow A until the tip of the bolt 10 abuts on the object 6 to be measured. Then, the other screw hole 7 also has a bolt 10
The bolt 10 is screwed in the direction of the arrow A until the tip of the abutment comes into contact with the object 6 to be measured. Further, when the two bolts 10 are screwed alternately, the case 2 attempts to lift in the direction of arrow B, and the space between the mounting surface 2d of the case 2 and the adhesive 9 or between the adhesive 9 and the object 6 to be measured. A splitting force occurs between them.

When the splitting force exceeds the adhesive strength of the adhesive 9, the case 2 is gradually peeled off from the measuring object 6, and the piezoelectric acceleration pickup 1 can be easily removed from the measuring object 6. At this time, although a force is applied to the thread of the screw hole 7 and the thread of the bolt 10, the outer surface of the case 2 is not damaged at all.

As described above, according to the piezoelectric acceleration pickup 1 of the present invention, the bolt 10 is screwed with a tool such as a hexagon wrench even when the piezoelectric acceleration pickup 1 according to the present invention is adhesively fixed in a narrow space where a removal tool such as a spanner cannot be used. If there is enough space to remove it, it can be easily removed. Accordingly, the piezoelectric acceleration pickup 1 can also be bonded and fixed to a place where it was not conventionally fixed because the removal is impossible, and the acceleration can be measured.

Next, another embodiment of the piezoelectric acceleration pickup to which the present invention is applied will be described with reference to FIGS. Piezoelectric acceleration pickup 11 shown in FIG.
The relief portion 12 is provided around the opening 7a of the screw hole 7 so that a step is formed between the mounting surface 2d and the opening 7a of the two screw holes 7. The escape portion 12 is a step portion having a width larger than the diameter of the screw hole 7 and extending from the side surface 2a to a side surface parallel to the side surface 2a, and is formed in the X direction through the openings 7a of the two screw holes 7.

A piezoelectric acceleration pickup 21 shown in FIG.
Also, relief portions 22 are provided around the openings 7a of the two screw holes 7 so that a step is generated between the mounting surface 2d and the openings 7a of the two screw holes 7. Escape portions 22, 22
Is a counterbore-shaped large-diameter hole larger than the diameter of the screw hole 7;
Each of the screw holes 7 is formed around an opening 7a.

A piezoelectric acceleration pickup 31 shown in FIG.
Also, relief portions 32, 32 are provided around corners of the case 2 and around the openings 7a of the two screw holes 7 so that a step is generated between the mounting surface 2d and the openings 7a of the two screw holes 7. Is provided. The relief portions 32, 32 are notch-shaped steps larger than the diameter of the screw holes 7, and are formed around the openings 7a of the two screw holes 7, respectively.

As described above, by providing the relief portions 12, 22, 32 on the mounting surface 2d of the case 2, the adhesive 9 is applied to the mounting surface 2d or the object 6 to be measured, and the piezoelectric acceleration pickups 11, 21, 21 are applied. Since the possibility that the adhesive 9 enters the inside of the screw hole 7 when bonding and fixing the 31 to the measurement object 6 is reduced, the bolt 10 can be smoothly screwed into the screw hole 7 when it is removed. The operation of removing the piezoelectric acceleration pickups 11, 21, 31 from the measurement target 6 is the same as that shown in FIG.

In the embodiment of the invention described above, the case where two screw holes 7 are formed at the end of the case 2 has been described. However, the number of the screw holes 7 depends on the mounting surface 2 d of the case 2.
Of the screw hole 7 (outer diameter of the bolt 10) and the like. Therefore, the number of screw holes 7 may be one or more.

The screw hole 7 is provided on the mounting surface 2 d of the case 2.
It does not need to penetrate vertically, and may be inclined. Furthermore,
If the tip of the bolt 10 screwed into the screw hole 7 abuts on the measurement object 6, the screw hole 7 does not need to penetrate the mounting surface 2d and may penetrate the side surfaces 2a and 2b.

In the above-described embodiment, the case where the present invention is applied to a three-directional piezoelectric acceleration pickup has been described. However, the detection directions are not limited to three directions. For example, it may be unidirectional or bidirectional. Further, the vibration component is not limited to the acceleration, but may be a displacement, a speed, or the like. Further, the detection element is not limited to the piezoelectric element, and may be, for example, a strain gauge or an electrodynamic detection element.

[0021]

As described above, according to the first aspect of the present invention, the vibration sensor can be easily removed from the object without damaging the outer surface of the case. In addition, even when the vibration sensor is adhered and fixed in a narrow space where it is difficult to use a removal tool such as a spanner, the vibration sensor can be easily removed if there is a space enough to screw the bolt.

According to the second aspect of the present invention, since the relief portion is provided around the opening of the screw hole, an adhesive is applied to the mounting surface or the object to be measured and is fixed to the object to be measured. In addition, since the possibility that the adhesive enters the inside of the screw hole is reduced, the bolt can be smoothly screwed into the screw hole when it is removed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a piezoelectric acceleration pickup to which the present invention is applied.

FIG. 2 is a side view of a piezoelectric acceleration pickup bonded and fixed to an object to be measured.

FIG. 3 is an operation explanatory view.

FIG. 4 is a side view (a) and a front view (b) of another embodiment of the present invention.

FIG. 5 is a side view (a) and a front view (b) of another embodiment of the present invention.

FIG. 6 is a side view (a) and a front view (b) of another embodiment of the present invention.

[Explanation of symbols]

1, 11, 21, 31 ... piezoelectric acceleration pickup, 2
... Case, 2a, 2b ... side surface, 2c ... top surface, 2d ... bottom surface (mounting surface), 3, 4, 5 ... detection part, 6 ... measurement object, 7
... Screw hole, 7a ... Opening, 9 ... Adhesive, 10 ... Bolt,
12, 22, 32 ... escape part.

Claims (2)

[Claims] 1. A vibration sensor having a mounting surface to a measurement object and detecting vibration by bonding and fixing the mounting surface to the measurement object, wherein a screw hole penetrating the mounting surface is provided.
A vibration sensor wherein a bolt is screwed into the screw hole and the tip of the bolt is abutted against the object to be removed from the object to be measured. 2. The vibration sensor according to claim 1, wherein a relief portion is provided on the mounting surface around the opening of the screw hole.