JPH0219736A - Method and instrument for measuring tension - Google Patents

Abstract

PURPOSE:To improve operability by providing supporting part in the projecting state at both ends of a supporting part in the beam state, abutting the supporting part against an object to be measured and detecting the deformation of a deforming part in the manner of applying a force to the deforming part and the object to be measured in the direction that they are mutually approached. CONSTITUTION:A measuring instrument 10 consists of a measuring part 11 and a binding member 12, and on the measuring part 11, the supporting components 14 are provided which are bent projectingly at both ends of the deforming part 13 formed in the beam state. On the deforming part 13, strain gages 15 are stuck to the upper and the lower faces. When a belt 23, etc., the tension of which is to be measured, is inserted between the components 14 and a loading rod 19, the deforming part 13 and the belt 23 are contacted by mutual deflections. A resistance changes are effected on the strain gages 15 with the deflections and detected as electrical signals, which are inputted to an arithmetic circuit 24, and the tension is calculated. The operability can be thus improved.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a tension measuring method and a measuring device for measuring the tension of power transmission belts such as belts, toothed belts, conveyor belts, sheets, lobes, threads, etc. It is something.

(Prior art) Conventionally, as a method for measuring the tension of lobes, threads, etc. suspended on bobbins or looms, a device having a plurality of pulleys is used, and the lobes, etc. are passed between the boars. It is known to measure tension by measuring the force with which a lobe is applied.

In addition, a method for measuring the tension of a belt, etc. suspended from a boob involves using a tension member (3) with a hook (2) at the tip in the center of an arch-shaped support member (1) as shown in Figure 7. It is slidably attached through the member (1), and a tension member (3) is applied with a tension force in the direction of arrow A by a spring (4), and the movement of the tension member (3) is caused by a rack and pinion. It is known to use a tension measuring device in which the needle or support disk exhibits a predetermined value.

That is, the tension of the conventional belt is such that both ends of the contact member (1) are brought into contact with the back surface of the belt (5), and the hook (2) is brought into contact with the back surface of the belt (5).
) and pull the belt with a predetermined spring force, find out the deflection of the belt (5) at that time, and measure the tension based on that.

(Problem to be Solved by the Invention) However, the conventional tension measurement method uses a pulley for the former method, which requires passing a lobe through a complicated pulley, which makes it difficult to operate; In order to measure the strength by the amount of bending movement of the belt, in order to ensure a measurable amount of movement, we measure the tension of the belt suspended in the device itself, especially the mechanical device with a large arcuate support member and a small center distance. It was difficult to do so.

Furthermore, for example, when measuring the tension of an automobile fan belt, the interior of the hood of modern automobiles is narrow and there is not enough space to measure the belt tension (conventional types cannot be used in many cases).

Therefore, the present invention focuses on such drawbacks of the prior art, and aims to provide a tension measuring method and device that are easy to operate and compact.

(Means for Solving the Problems) The features of the present invention for achieving the above-mentioned objects are as follows:
One is to abut the support parts of a measuring part, which is provided with convex support parts at both ends of a beam-like deformation part, on an object to be measured such as a belt, and bring the object to be measured into contact with the center of the deformation part; A tension measuring method characterized by measuring the deformation of the deformed portion at that time and converting it into tension.

Convex support parts are provided at both ends of the beam-shaped deformation part to which the strain gauge is attached, forming a measurement part, and the deformation is performed on the concave side formed by the deformation part and the support part. 1. A tension measuring device comprising a load rod that presses an object to be measured toward a deformed portion.

Eight, there is a tension measuring section consisting of a measurement section consisting of a beam-shaped deformed section to which a strain gauge is attached and convex support sections provided at both ends, and a fastening member that connects the deformed section and the object to be measured. Located in the measuring device.

(Function) In the tension measuring method and measuring device of the present invention, the measuring portion is brought into contact with the belt or the like via the support portion, and the deformable portion is arranged parallel to the belt or the like.

In this state, the belt is forced onto the deformed portion by the load rod or the fastening member, and the center of the portion sandwiched between the support portions is brought into contact with the center of the deformed portion.

At this time, the deformed part becomes in the same stress state as when a concentrated load is applied to a simple support beam, and the deformed part is bent and deformed. This amount of deformation is detected as an electrical signal because a strain gauge is attached to the deformation, and by knowing the tension corresponding to this signal, the tension of the object to be measured, such as a belt, can be obtained.

(Example) Specific examples of the present invention will be further described below.

FIG. 1 is a perspective view of a tension measuring device in a specific embodiment of the present invention, FIG. 2 is a view taken in the direction of arrow B during measurement of the tension measuring device of FIG. 1, and FIGS. The figures are a front view of the measuring section of the tension measuring device in another embodiment, FIG. 5 is a perspective view of the tension measuring device in another embodiment, and FIG.
The figure is a partial sectional view of the embodiment in FIG. 5.

In FIG. 1, (10) is a tension measuring device in a specific embodiment of the present invention. Tension measuring device of this example (10
) is composed of a measuring part (11) and a fastening member (12). The measurement part (11) is provided with a support member (14) by bending both ends of a deformed part (13) formed into a beam shape from a straight plate into a convex shape. Deformed part (13)
Since this causes bending deformation, it is preferable to use spring steel as the material. The support member (14) is formed by bending both ends of the deformed part (13) as in this embodiment, and is also made of a material having a higher rigidity than the deformed part (13) in order to prevent buckling of the part. It is also preferable to separately provide a tall one. (15) is a strain gauge,
It is attached to the top and bottom surfaces of the deformed part. Fastening member (
12) roughly resembles cleaning scissors, and the two square rod-shaped members (16) and (17) of the same shape with a convexly curved central portion are
At the curved part they are joined by a pin (18), i.e. the member (
17) is fixed to the upper surface of the deformable portion (13).

The tip of the other part $4 (17) is arranged on the opposite side of the deformed part (13) and on the side of the U-shaped opening formed together with the beating support member (14), and constitutes a load rod (19). are doing. A bamboo spring (22) that presses the members (18) and (17) away from each other is inserted into the opposite side of the fastening member (12) across the bottle (18), that is, the gripping portion (21);
When the grip portion (21) is released, the load rod (19) is loaded toward the deformed portion (13) by a constant load.

Second, a method for measuring tension using the tension measuring device described above will be explained.

First, grasp the grip (21) of the fastening member (12) and push the load rod (19) apart.

Then, the belt, thread, etc. to be measured is inserted between the support member (14) and the load rod (19), and the grip (21) is released. At this time, the measuring device (10) and the belt (23) are connected to the second
They come into contact by bending each other as shown in the figure.

This deflection causes a resistance change in the strain gauge (15), which is detected as an electrical signal and is detected as an electric signal.
In step 4), predetermined calculations are performed manually to calculate the tension.

In the above embodiments, the shape of the deformable part is such that the thickness of all parts is uniform, but as shown in Figure 3, only the part to which the strain gauge is attached may be made thinner, or the material may be easily deformed. By configuring it in this way, higher accuracy and smaller size can be achieved.

Further, the deformable member may not be linear but may be arcuate. In the example, the strain gauge is attached to one of the deformed parts.
Although we pasted them on the weight and the back of several places, the number and location of pasting is optional.

However, when attaching to multiple locations, it is preferable to attach the load rod from side to side, since this can correct unbalanced deformation (Figure 4).

5 and 6 show different embodiments of the fastening member.

The fastening member (30) of the embodiment shown in FIGS. 5 and 6 includes a casing (31), a presser bar (32), and a spring (33).
Consisted of. The casing (31) is a cylinder with two gripping rods (34) provided in the upper part in parallel with the deformed part, a hole (35) in the upper part, and a long hole in the axial direction in the center of the side surface. (not shown). Presser bar (32
) is provided with a handlebar (37) at the upper end of the shaft (36), and a disk-shaped spring holder (38) whose outer diameter is smaller than the inner diameter of the casing (31) at the lower end. . Further, the spring holder is provided with a U-shaped load rod (39). Each of the above-mentioned components consists of a presser bar (32
) spring retainer (38) enters the casing, and the rod (36)
) is inserted into the hole (35), and the load rod (39) comes out of the casing from a groove (not shown).
1) and the rod (36) are fitted, and the casing (31) is fixed to the center of the deformable part (40) with the load rod (39) placed between the deformable parts (40), and the casing (31) ) A helical spring (33) is inserted in a compressed state between the spring holder (38) and the deformable portion (40).

The fastening part of this example lowers the load rod (39) by pushing down the handlebar (37) instead of gripping the grip part of the clothespin test above, and when the handlebar (37) is released, the spring (33) ) the load rod is pushed up.

(Effects) The tension measuring method and device of the present invention abuts a beam-shaped deformed portion with a belt, etc. at three points, causes the deformed portion to deflect due to the tension of the belt, etc., and measures this deflection, thereby measuring the belt tension. It is something that can be sought after.

The advantage of the present invention is that it does not measure the amount of deformation of the belt or the like, so there is no need to deform the belt so large that it can be measured, and the entire device can be made smaller. Therefore, it is possible to easily and accurately measure the tension of a mechanical device having a small center distance.

Further, since belts, threads, etc. are themselves compressible, conventional tension measurement methods cause errors due to the amount of compression, but the measurement method of the present invention has high accuracy because it is independent of the amount of belt deformation.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a tension measuring device in a specific embodiment of the present invention, FIG. 2 is a view taken in the direction of arrow B during measurement of the tension measuring device of FIG. 1, and FIGS. The figures are a front view of the measuring section of the tension measuring device in another embodiment, FIG. 5 is a perspective view of the tension measuring device in another embodiment, and FIG.
The figure is a partial cross-sectional view of the embodiment in FIG. 5, and FIG. 7 is a schematic diagram of a prior art tension measuring device. (10)... Tension measuring device (11)... Measuring part (12)... Fastening part (13) (40)... Deformation part (14)... Support part (15)... Strain gauge (19) (39) ...Load rod

Claims (1)

[Claims] 1. The supporting parts of the measuring part, which is formed by protruding supporting parts provided at both ends of a beam-like deformed part, are brought into contact with the object to be measured, and the deformed part and the object to be measured are moved in a direction in which they approach each other. A tension measurement method characterized by applying a force to fasten the two parts, detecting the deformation of the deformed part at that time, and converting it into tension. 2. Convex support parts are provided at both ends of the beam-shaped deformation part to which the strain gauge is attached to form a measurement part, and the object to be measured is placed on the concave side formed by the deformation part and the support part. A tension measuring device characterized by having a load rod that presses to the side. 3. It is characterized by being composed of a measuring part, which is a beam-shaped deformed part to which a strain gauge is attached, and convex support parts provided at both ends, and a fastening member that fastens the deformed part and the object to be measured. Tension measuring device.