JPH07128167A - Component force measuring apparatus - Google Patents

Abstract

PURPOSE:To prevent destruction of a part subjected to a load by reducing a set space as much as possible even when a large sample is measured. CONSTITUTION:A frame-shaped load receiving part 1 subjected to a load and a frame-shaped ground part 2 which is set securely on the ground surface or the like to support a force are laminated vertically at a specified interval. Two sides as opposed of the load receiving part 1 are linked to two sides at the central part 3 facing them with upper beams 4, four in total, two per one side piercing the central part of the load receiving part 1 and the ground part 2 and at the central part 3 where the bottom surface of the load receiving part is positioned at an upper part than the bottom surface of the ground part 2. Two sides as opposed of the ground part 2 in the direction orthogonal to the upper beams 4 are linked to the two sides at the central part 3 facing them with lower beams 5, four in total, two per one side to support the load receiving part 1 and the ground part 2 at the central part 3. The upper beams 4 and the lower beans 5 are provided with a strain gauge and distortions of the individual beams 4 and 5 detected with the strain gauges are detected and measured by an electric processing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical force (Z axis direction), a horizontal load (X, Y axis direction) of a test piece, and a component force measuring device used for detecting a moment around each axis.

[0002]

2. Description of the Related Art As a conventional measuring device of this type, the one described in Japanese Patent Application Laid-Open No. 2-163627 is known. This is to connect two opposite sides of a load receiving plate to which a load is applied and two sides of an inner frame surrounding the load receiving plate with at least four inner beams to face two opposite sides of an outer frame surrounding the inner frame. And two sides of the inner frame are connected by at least four outer beams in a direction crossing the inner beam to support the load bearing plate and the inner frame by the outer frame,
A strain gauge is provided on the inner beam and the outer beam, and the strain amount of each beam detected by the strain gauge is electrically processed and amplified to be detected and measured. According to this conventional example, two strains in the horizontal direction are detected by detecting the strain amounts in the vertical direction with respect to the load receiving plate, that is, in the Z axis direction and the X axis direction and the Y axis direction that are orthogonal to each other in the horizontal direction of the load receiving plate. The directional load and the vertical or weight can be measured.

[0003]

The conventional measuring device has a double-frame structure, and since the load-bearing plate is located inside the double frame (inner frame, outer frame), when measuring a large specimen. However, it was necessary to make the device with a larger outer frame sufficient to enclose the load bearing plate, which made it difficult to reduce the installation space. It is conceivable to install a larger receiving plate on the load receiving plate of such a conventional device, but the receiving plate that largely projects outward from the periphery of the load receiving plate may be destroyed by the weight of the specimen. There was a limit to the mounting of the backing plate.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a component force measuring apparatus which requires a small installation space even when measuring a large test piece and which is less likely to break a portion receiving a load.

[0005]

In order to achieve the above-mentioned object, the present invention provides a frame-shaped load receiving portion to which a load is applied and a frame-shaped grounding portion which is installed and fixed on a grounding surface or the like to support a force. The load receiving parts are arranged one above the other at intervals and vertically pass through the centers of the load receiving part and the ground contacting part, and the bottom face is opposed to the load receiving part at the central part located above the bottom surface of the ground contacting part. The two sides and the two sides of the central portion facing each other are connected to each other by two upper beams, one on each side, and a total of four upper beams, and two of the central portions facing the two opposite sides of the grounding portion in the direction orthogonal to the upper beams. Each side is connected to one side by four lower beams in total to support the load bearing part and the grounding part in the central part, and strain gauges are provided on the upper beam and the lower beam. It is configured such that the strain amount of the beam is electrically processed and detected and measured.

[0006]

In the present invention, since the load receiving portion to which a load is applied and the central portion are connected by the upper beam, and the ground portion and the central portion are connected by the lower beam in the direction orthogonal to the upper beam, Since the load bearing portion and the ground contact portion are connected by the upper beam and the lower beam in the central portion, the ratio of the area of the load bearing portion to the entire device increases. Conversely, the device can be made smaller than the area of the load-bearing part, and when it is installed and installed in a testing machine, the space can be small, which contributes to downsizing of the testing machine. It will be. Further, by providing strain gauges on the upper and lower surfaces and / or side surfaces of the upper beam and the lower beam, the load in the vertical direction, that is, the Z-axis direction with respect to the load-bearing plate, the X-axis and the Y-axis orthogonal to each other in the horizontal direction of the load-bearing plate. Not only the load in each axis direction but also the moment around each axis of X-axis, Y-axis, and Z-axis can be detected.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

In the embodiment shown in FIGS. 1 to 3, a frame-shaped load receiving portion 1 to which a load is applied and a frame-shaped grounding portion 2 which is fixedly installed on a ground surface or the like and supports a force are vertically arranged at predetermined intervals. They are arranged on top of each other. A central portion 3 is provided so as to vertically pass through the centers of the load bearing portion 1 and the grounding portion 2.
2 facing the opposite two sides of the load bearing portion 2 of the central portion 3
Two sides are connected to one side by a total of four upper beams 4, and two sides of the central part 3 facing each other in the direction orthogonal to these upper beams 4 and two sides of the central part 3 which face each other are set to one side. Two of them are connected by a total of four lower beams 5, and the load bearing portion 1 and the ground contact portion 2 are supported by the central portion 3. When the measuring device configured as described above is set, the lower surface of the ground portion 2 is grounded, and the central portion 3 is supported by the lower beam 5 in a floating state so as not to be grounded. Further, a receiving groove 6 is formed on the inner peripheral side of the load receiving portion 1, and a load receiving plate 7 as shown in FIG. A screw hole 8 is formed in a corner portion of the receiving groove 6 so that the load receiving plate 7 can be screwed. Load bearing part 1, ground contact part 2, central part 3, upper beam 4 and lower beam 5
The member consisting of is made by one-piece molding by cutting. As the material to be cut out, materials such as iron plate, aluminum, duralumin, ceramics and plastics can be preferably used. Further, the cross-sectional shapes of the upper beam 4 and the lower beam 5 are quadrangular, and they are provided after appropriately selecting a structure and a mounting portion that bend when a load is applied.

The upper beam 4 and the lower beam 5 have strain gauges A to
Although L is attached, the attachment state of these strain gauges A to L will be described with reference to FIGS. A strain gauge A is attached to the center of the upper surface of the upper beam 4, and strain gauges C and D are attached to both ends thereof. The lower surface of the upper beam 4 has a strain gauge B in the center,
Strain gauges E and F are attached to both ends. On the side surface of the upper beam 4, strain gauges H and G are provided at the center, and strain gauges I to
L is attached. On the upper surface of the lower beam 5, a strain gauge A is attached at the center and strain gauges C and D are attached at both ends. On the lower surface of the lower beam 4, strain gauges B are attached at the center and strain gauges E and F are attached at both ends. The measurement of the load in the horizontal position direction of the load receiving portion 1, that is, the load in the X-axis direction is shown in FIG.
The strain of the lower beam 5 is detected and measured by the strain gauges A and B at the points. In addition, Y that is orthogonal to the X-axis direction in the horizontal direction
Axial load is strain gauge A at or
And B, the strain of the upper beam 4 is detected and measured. The load in the vertical direction, that is, the Z-axis direction on the load receiving portion 1 is measured by detecting the strain of the upper beam 4 with the strain gauges G and H at the points. Further, the moment Mx about the X-axis is measured by detecting the strain of the lower beam 5 with the strain gauges C, D, E and F at the positions. Further, the moment My about the Y axis is measured by detecting the strain of the upper beam 4 with the strain gauges C, D, E, and F at the positions. Furthermore, the moment Mz about the Z axis is measured by detecting the strain of the upper beam 4 with the strain gauges I, J, K, and L at the positions of.

The strain gauges shown in FIGS. 7 to 10 are attached to the upper surface, the lower surface and both side surfaces of the upper beam 4 at the points. A bending strain gauge in the same direction as the upper beam 4 is attached to both ends, and a shear strain gauge having a resistance forming an angle of 45 ° with the load direction is attached to the center.

FIG. 11 and FIG. 12 show strain gauges at the location of the lower beam 5, showing examples attached to the upper surface and the lower surface, respectively.

13 to 18 show wiring diagrams of strain gauges, which form a Wheatstone bridge and form X
The load in the directions of the axes, Y-axis and Z-axis and the moment around the X-axis, Y-axis and Z-axis can be measured. For example,
The measurement of the load in one direction in the horizontal direction of FIG.
And B are connected by the Wheatstone bridge shown in FIG. 14, and the resistance value change due to the strain of the upper beam 4 is output.
(+) And SIG (-) are detected as voltage values.

[0013]

As described above, according to the present invention, the ratio of the area of the load receiving part to the entire device is increased, and conversely, the device can be made smaller than the area of the load receiving part. The overall size of the device can be made compact.
Further, since the ratio of the area of the load receiving portion becomes large, the portion receiving the load is not easily broken.

[Brief description of drawings]

FIG. 1 is a plan view showing a preferred embodiment of the present invention.

FIG. 2 is a lateral half sectional view of FIG.

FIG. 3 is a vertical half sectional view of FIG.

FIG. 4 is a plan view showing an attachment point of a strain gauge.

FIG. 5 is a front view showing a mounting portion of a strain gauge.

FIG. 6 is a side view showing a mounting portion of a strain gauge.

FIG. 7 is a diagram showing a strain gauge attached to the upper surface of an upper beam.

FIG. 8 is a diagram showing a strain gauge attached to the lower surface of the upper beam.

FIG. 9 is a diagram showing a strain gauge attached to one side surface of an upper beam.

FIG. 10 is a view showing a strain gauge attached to the other side surface of the upper beam.

FIG. 11 is a diagram showing a strain gauge attached to the upper surface of a lower beam.

FIG. 12 is a view showing a strain gauge attached to the lower surface of a lower beam.

FIG. 13 is a wiring diagram of a strain gauge for measuring a load in the Z-axis direction.

FIG. 14 is a wiring diagram of a strain gauge for measuring a load in the X-axis direction.

FIG. 15 is a wiring diagram of a strain gauge for measuring a load in the Y-axis direction.

FIG. 16 is a connection diagram of a strain gauge for measuring a moment about the Z axis.

FIG. 17 is a connection diagram of a strain gauge for measuring a moment about the X axis.

FIG. 18 is a connection diagram of a strain gauge for measuring a moment around the Y axis.

[Explanation of symbols]

 1 Load-bearing part 2 Grounding part 3 Central part 4 Upper beam 5 Lower beam A to L Strain gauge

Claims (2)

[Claims] 1. A frame-shaped load receiving part to which a load is applied and a frame-shaped grounding part installed and fixed on a grounding surface or the like to support a force are vertically stacked at a predetermined interval, and the load receiving part and the grounding are arranged. In the central part, which vertically penetrates the center of the load-bearing part, and whose bottom face is located above the bottom face of the grounding part, two sides of the central part facing each other and two sides of the central part facing each other are two sides. Connected with a total of four upper beams, and with two lower side beams in a direction perpendicular to the upper beams, two sides facing the grounding part and two sides of the central part facing each other are connected with a total of four lower beams. The load bearing part and the grounding part are supported by the central part, strain gauges are provided on the upper beam and the lower beam, and the strain amount of each beam detected by the strain gauge is electrically processed and detected and measured. Component force measuring device configured. 2. The component force measuring device according to claim 1, wherein shear strain gauges and / or bending strain gauges are provided on the upper and lower surfaces and / or side surfaces of the upper beam and the lower beam as the strain gauges.