JPS6140329B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a load transducer, and more particularly to a load transducer using a strain gauge.

Conventional load transducers using this type of strain gauge are made of Ni in the shape shown in Figures 1 and 2.
- Since it was a load cell type load transducer 10 that was integrally molded or processed using special metals such as Cr steel, duralumin, and beryllium copper, it had a high accuracy of 1/3000 to 1/10000, but on the other hand, The disadvantage was that the cost was high in terms of materials and processing. The present invention has been made in view of the above points, and its purpose is to form a roberval mechanism with a pair of spacers in the shape of a deck plate bent into a crank shape (defined by JIS G3352). The aim is to reduce the cost of the mass-produced shape, and at the same time improve the precision of the spacer and give it mechanical strength, thereby reducing the precision and cost of the spacer as a load converter. Embodiments of the present invention will be described below based on the drawings. In Figure 3, 1
is a deck plate-shaped plate, which has convex portions 4 on the top and bottom thereof, and positioning is performed by inserting the notch portion 8 and the concave portion 6 of the spring plate 2 into the convex portions 4. Then, either caulk the convex part 4 as it is, or place the caul plate 3 and insert the locking recess 5 into the convex part 4 to determine the position between the deck plate-shaped plate 1, the spring plate 2, and the caul plate 3. Then, resistance welding is performed between the deck plate-shaped plate 1 and the patch plate 3, or seam welding is performed between the spring plate 2 and the patch plate 3, or between the deck plate-shaped plate 1 and the spring plate 2. They are fixed to each other to form a roberval mechanism.
FIG. 4 is an assembly diagram of the same, and 7 represents the position of the strain gauge 9 attached to the spring plate 2. In this way, when a strain gauge is pasted on one side of the spring plate 2 or both the upper and lower spring plates 2 and the A side shown in Figure 4 is fixed and a load is applied to the B side, the deformation of the spring plate 2 The strain value is read by the resistance value of the strain gauge 9 and used as a load converter.

In addition to the shape of the deck plate shown in FIG. 3, other shapes such as those shown in FIG. 5, FIG. 6, and FIG. 7 can be considered. Furthermore, the same effect can be obtained by using a flat plate as shown in FIG. 8 or a notched plate as shown in FIG. 9 as the backing plate.

In the present invention, since spring plates are installed above and below the deck plate shape plate as described above, the mechanical strength against bending and the spaces l and l' in Fig. 4 have the same dimensional accuracy and when a load is applied. Dimension l does not go out of order. Further, since there is no bent part in the sheet metal processing having the dimension l, high accuracy can be obtained. moreover,
Due to the fitting structure of the convex part and the concave part, no jig is required during assembly. Since the entire structure is made of sheet metal, it has the advantage of being mass-produced and reducing costs.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a conventional load cell type load converter, FIG. 2 is a perspective view showing a conventional example, FIG. 3 is an exploded perspective view showing an embodiment of the present invention, and FIG.
The figure is a perspective view of the same as above, FIGS. 5 to 7 are perspective views of a deck plate-shaped plate used in the same, FIGS. 8 and 9 are perspective views showing a patch plate used in the same, Detsuki plate shaped plate, 2 is a spring plate,
4 is a convex portion, 8 is a notch portion, and 9 is a strain gauge.

Claims (1)

[Claims] 1. In a load converter with a sheet metal structure, a pair of spring plates are installed above and below a pair of deck plate-shaped plates bent into a crank shape, and the deck plate-shaped plates and the spring plate form a parallelogram. A load transducer characterized in that it is formed into a Roberval mechanism, and a strain gauge is attached to a spring plate. 2. In the connection of the deck plate-shaped plate and the spring plate, the notch of the spring plate is inserted into the convex part provided on the deck plate-shaped plate to achieve positioning, and the spring plate and the deck plate-shaped plate are fixed. A load transducer according to claim 1.