JP2004028634A - Strain gauge attaching method and equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a strain gauge attaching method and equipment which can improve precision of sticking position of a strain gauge, attach simultaneously strain gauges on a plurality of portions, and realize labor saving of work and improvement in efficiency. <P>SOLUTION: Both sides of a blade 1 of a turbopump as a part member to be measured on which the strain gauges 2 are attached are clamped and held by using a fixing holder 3. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for attaching a strain gauge.
[0002]
[Prior art]
In general, a strain gauge utilizes the fact that when a wire is pulled, the length and cross-sectional area change, and the electrical resistance changes. The strain gauge has a structure in which the wire is bent and pasted on a mount (or plastic). By having a strain gauge attached to the surface of the member to be measured for which strain is to be measured using an adhesive, the wire of the strain gauge receives the same strain as the member to be measured, and the electrical The distortion of the member to be measured is measured from the amount of change.
[0003]
By the way, in the conventional case, when attaching the strain gauge to the surface of the member to be measured whose strain is to be measured, first, an adhesive is applied to the strain gauge, and the strain gauge to which the adhesive is applied is attached to the member to be measured. After pressing it against a required part of the surface and holding it by hand until the adhesive dries to a certain extent, the member to be measured is placed in a drying oven and dried, and the strain gauge is fixed to the surface of the member to be measured. Was.
[0004]
[Problems to be solved by the invention]
However, as described above, if a person holds the strain gauge by hand until the adhesive dries to some extent, the position where the strain gauge is stuck may be shifted, while the strain gauge may be stuck to a plurality of places at the same time. It is difficult to attach, and has a drawback that it takes a lot of trouble and time.
[0005]
In view of the above circumstances, the present invention can improve the position accuracy of attaching the strain gauge, and can simultaneously attach the strain gauge to a plurality of locations, and can save labor and improve efficiency of work. It is intended to provide a method and apparatus.
[0006]
[Means for Solving the Problems]
In the present invention, a strain gauge is attached to the surface of the member to be measured, and both surfaces of the member to be measured to which the strain gauge is attached are sandwiched by fixing jigs so that the strain gauge does not fall off the surface of the member to be measured. The method according to the present invention relates to a method of attaching a strain gauge, wherein the strain gauge is dried in a state where the strain gauge is adhered to the surface of the member to be measured.
[0007]
Further, the present invention relates to a strain gauge sticking apparatus comprising a fixing jig capable of holding and holding both surfaces of a member to be measured on which a strain gauge is stuck.
[0008]
According to the above means, the following effects can be obtained.
[0009]
A strain gauge is attached to the surface of the member to be measured, and both surfaces of the member to be measured to which the strain gauge is attached are sandwiched by fixing jigs, and dried in a state where the strain gauge does not fall off the surface of the member to be measured. Then, when the strain gauge is fixed to the surface of the member to be measured, it is not necessary for a person to hold the strain gauge by hand until the adhesive dries to some extent, as in the past, and the position where the strain gauge is attached is shifted. On the other hand, it is possible to simultaneously attach the strain gauges to a plurality of locations, which saves labor and time.
[0010]
In the strain gauge sticking device, the fixing jig,
A holding plate for holding both sides of the member to be measured,
An adhesion layer fixed to the contact surface of the holding plate with the surface of the member to be measured and following the surface of the member to be measured;
And a fastening member for holding the holding plate in close contact with both surfaces of the member to be measured via the adhesion layer.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
FIGS. 1 to 3 show an example of an embodiment of the present invention, in which a strain gauge 2 is attached to a required portion of a surface of a blade 1 of a turbo pump as a member to be measured, and strain due to fluid vibration is measured. As shown in FIGS. 1 and 2, both surfaces of a blade 1 of a turbo pump as a member to be measured to which a strain gauge 2 is attached are held by a fixing jig 3 as shown in FIGS. And hold it.
[0013]
The fixing jig 3 includes a metal holding plate 4 for holding both surfaces of the blade 1, an adhesion layer 5 fixed to a contact surface of the holding plate 4 with the surface of the blade 1 and following the surface of the blade 1, A fastening member 6 such as a bolt and a nut for holding the holding plate 4 in close contact with both surfaces of the blade 1 via the contact layer 5 is provided.
[0014]
As the adhesion layer 5, for example, clay can be used. In this case, as shown in FIG. 2, in order to prevent the clay from adhering to the strain gauge 2, a thin material such as vinyl or Teflon (registered trademark) is used. The strain gauge 2 is covered with the sheet 7. The adhesive layer 5 may be made of, for example, urethane resin or the like, other than clay. In this case, it is not necessary to cover the strain gauge 2 with the sheet 7 as shown in FIG.
[0015]
Next, the operation of the illustrated example will be described.
[0016]
First, as shown in FIG. 1, a strain gauge 2 is attached to the surface of a blade 1 of a turbo pump as a member to be measured using an adhesive, and both surfaces of the blade 1 to which the strain gauge 2 is attached are shown in FIG. As shown in FIG. 3, the blade is clamped by the clamping plate 4 of the fixing jig 3 via the adhesive layer 5 and fastened by the fastening member 6 so that the strain gauge 2 does not fall off the surface of the blade 1. 1 is placed in a drying furnace (not shown) and dried, and a strain gauge 2 is fixed to the surface of the blade 1. In the case of the blade 1 of the turbo pump, after the strain gauge 2 is fixed, the strain gauge 2 is further covered with a thin metal plate (not shown), the periphery thereof is welded, and a coating agent is applied.
[0017]
As a result, it is not necessary for a person to hold the strain gauge 2 by hand until the adhesive is dried to some extent as in the related art, and there is no possibility that the position where the strain gauge 2 is attached is shifted. Can be attached to a plurality of places at the same time, which saves labor and time.
[0018]
In this manner, the accuracy of the position where the strain gauge 2 is attached can be improved, and the strain gauge 2 can be attached to a plurality of locations at the same time, which can save labor and improve efficiency.
[0019]
It should be noted that the strain gauge attaching method and apparatus of the present invention are not limited to the above illustrated examples, and it is needless to say that various changes can be made without departing from the gist of the present invention.
[0020]
【The invention's effect】
As described above, according to the strain gauge sticking method and apparatus of the present invention, the accuracy of the strain gauge sticking position can be improved, and the strain gauges can be stuck to a plurality of locations at the same time, thereby saving labor. In addition, an excellent effect that efficiency can be improved can be obtained.
[Brief description of the drawings]
FIG. 1 is a side view of an example of an embodiment of the present invention.
FIG. 2 is a side sectional view of an example of an embodiment of the present invention.
FIG. 3 is a plan view of an example of an embodiment of the present invention.
[Explanation of symbols]
1 blade (member to be measured)
2 Strain gauge 3 Fixing jig 4 Holding plate 5 Adhesion layer 6 Tightening member

Claims (3)

A strain gauge is attached to the surface of the member to be measured, and both surfaces of the member to be measured to which the strain gauge is attached are sandwiched by fixing jigs. And attaching the strain gauge to the surface of the member to be measured. An apparatus for attaching a strain gauge, comprising: a fixing jig capable of holding and holding both surfaces of a member to be measured on which a strain gauge is attached. Fixing jig,
A holding plate for holding both sides of the member to be measured,
An adhesion layer fixed to the contact surface of the holding plate with the surface of the member to be measured and following the surface of the member to be measured;
3. The strain gauge sticking device according to claim 2, further comprising a clamping member for holding the holding plate in contact with both surfaces of the member to be measured via the contact layer.

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