JPS5857694B2 - Manufacturing method of load receiver for load cell type load cell - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a load cell type load cell which detects a load by a change in the electrical characteristics of a detection element such as a resistance wire strain element or a crystal oscillator attached to a load receiver. The present invention relates to a method of manufacturing a body.

Conventionally, a detection element such as a resistance wire strain element or a crystal oscillator is attached to a load receiver, one end of the load receiver is supported by a support member, and a weighing pan is attached to the open end of the load receiver. A load cell that measures the weight of an object by detecting the distortion of the load receiver as a change in the electrical characteristics of the detector element when the load of the object is applied to the object, and converting this to weight. has been put into practical use.

Conventionally, when manufacturing this type of load receiver, first a solid material whose overall external shape is slightly larger than the finished product is formed by forging or casting, and then the entire circumference of this solid material is cut by machining. At the same time, the central part was cut into a hollow shape and processed into a parallelogram shape, and furthermore, some relief processing was performed in areas other than the mounting part.

In this way, the entire periphery, hollow parts, and relief parts of the bare material were all machined, which resulted in a considerable amount of cutting, especially when labor costs are high these days. The processing cost of the load receiver had increased significantly.

Moreover, if the raw material is cut into a hollow shape and then the entire outer periphery is cut, the amount of material to be cut will be considerably large, resulting in a lot of waste, and the material cost will be high.This, combined with the high processing cost mentioned above, However, the cost of the load receiver has increased significantly.

In addition, if the material is forged or cast,
This type of load cell, which measures by the amount of strain on the load receiver, may not be able to measure with high accuracy because the material may become uneven due to the formation of cavities inside. .

This invention was made in view of the above circumstances, and its purpose is to reduce the amount of machining considerably, thereby reducing machining costs, and reducing the amount of cutting, thereby reducing waste of material, and to reduce the amount of machining required. We would like to provide a method for manufacturing a load receiver for a load cell type load cell that can be used with high precision because the cost is significantly lower, and the material is uniform without the formation of nests inside. That is.

The present invention will be explained below with reference to embodiments shown in the drawings.

In the figure, 1 is a parallelogram-shaped hollow extruded material made of a material such as high-strength aluminum and formed into an elongated shape by hollow extrusion.The cross section of this material 1 is rectangular in outline, as shown in Figures 1 and 2. In addition, an arc-shaped recess is formed in the center of both sides 2, each corner 3 is shaped like an arc, and the upper and lower surfaces 4 are formed in a straight line. .

Furthermore, a rectangular hollow part 5 is formed inside the material 1, and a lower surface 6 and both side surfaces 7 are formed in a straight line, and each corner part 8 is formed in an arc shape. .

Then, after the material 1 having the cross-sectional shape described above is formed into a long and thin material by extrusion molding, the material 1 is sequentially cut along cutting lines 9 at predetermined intervals to form the material 1 having a predetermined width.

Next, a predetermined portion of the material 1 cut to a predetermined width, that is,
The parts that require high machining accuracy are cut by machining, and this will be explained with reference to FIGS. 3 and 4.

In the vicinity of the detection element attachment part, the upper and lower surfaces 4 of the material 1 are cut to the position of the detection element attachment surface 10, and a hollow portion 5 is cut.
Both side parts 11 of the upper and lower surfaces 6 are cut into arcuate concave surfaces to form a thin-walled part where the detection element is attached. ) is machined to the specified dimensions with high precision.

In addition, the upper and lower sides of both sides 2 of the material 1 are cut in a straight line, and the supporting member attachment portion 12 and the weighing plate attachment portion 1 are cut into straight lines.
2, the distance between these mounting parts 12 is finished to a predetermined dimension, and the mounting surfaces of both mounting parts 12 are processed to be flat, and the central part of both mounting parts 12 is made of bare skin. An arcuate relief surface is formed.

Further, each of the mounting parts 12 has a screw hole 13 for mounting.

When the load receiver is manufactured in this way, the material 1 is formed into a hollow extruded material, which is cut into predetermined lengths in order, and then cut into the area near the detection element attachment area, where finishing accuracy is particularly required, and between both ends. Since only the attaching part 12 etc. need to be cut by machining, the amount of cutting is greatly reduced, processing can be done easily and quickly, there is less wasted material, and it is also suitable for mass production. , it is possible to significantly reduce costs.

When using the above load receiver as a load cell, as shown in FIG. Attach the attachment part of the weighing plate B to a certain weighing plate attachment part 12, and
The detection element adhesion portion on both the upper and lower adhesion surfaces 10 (arc-shaped surface 1
Four detection elements C are attached to the thin-walled part (corresponding to 1), and when the load receiver is distorted by the load of the object to be weighed placed on the weighing pan B, this is determined by the electrical characteristics of the detection elements C. The weight of the object to be weighed is detected by converting this amount of change into weight.

Note that both sides 2 of the material 1 may be formed in a straight line,
It goes without saying that the shape of the load receiver is not limited to the above-mentioned embodiments, and may be of any other shape.

As described in detail above, in this invention, the material of the load receiver is shaped by hollow extrusion, and after cutting this elongated hollow extruded material to a predetermined width, the support member attachment portions at both ends, the weighing pan attachment portion, and the This is characterized in that the thin-walled soft part near the detection element attachment part is cut by machining to form a predetermined shape.

Therefore, since only the areas near both the recording parts and the detection element attachment part, which require high machining accuracy, are machined, the amount of machining is considerably reduced compared to the conventional method, and the machining cost is reduced. Since the amount is considerably reduced, there is almost no wastage of expensive materials, it is economical, and it is also suitable for mass production, so the cost of the load receiver can be significantly reduced.

In addition, since the material is extruded, there will be no cavities inside the load receiver and the balance will be lost, and the material can be made uniform, so it can be accurately warped against the load.
It has excellent effects such as being able to be used with high precision as a load meter.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a hollow extruded material used in an embodiment of the present invention, Fig. 2 is an enlarged vertical cross-sectional view of the same material, Fig. 3 is a front view of the same material machined, and Fig. 4 is the same. FIG. 1... Hollow extruded material, 5... Hollow part of the material, 9... Cutting line of the material, 10...
・Detection element attachment surface, 12... Support member, each mounting part of the weighing plate, A... Support member, B...
Weighing plate, C...detection element.

Claims (1)

[Claims] 1 A detection element was attached to a parallelogram-shaped load receiver, one end of the load receiver was supported by a support member, and the load of the object to be measured was applied to the weighing pan at the open end of the load receiver. In the load cell type load meter, which detects the weight of the object to be weighed by converting the change in the electrical characteristics of the detection element during the measurement into weight, the material of the load receiver is formed into a long and thin piece by hollow extrusion molding. After cutting the elongated hollow extruded material to a predetermined width, it is cut into a predetermined shape by machining so as to form a thin-walled part in the vicinity of both the attachment parts of the support member and weighing plate and the detection element attachment part. A method for manufacturing a load receiver for a load cell type load cell, characterized in that: