JPS6032131B2 - Repeated tensile bending test method and test equipment for wire ropes, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a testing method and apparatus for simultaneously conducting tensile and bending tests on wire ropes and the like.

The hanger rope on the largest suspension bridge is thicker, for example 60
0 to 900 is required, and in the case of a bridge used for both railways, corner bending of the girder becomes a problem.

In fatigue testing of hanger ropes used in such long suspension bridges, it is necessary to repeatedly bend the ropes while applying tension to the ropes. However, a testing device or method for simultaneously conducting such tension and bending tests has not yet been developed.

If a device for this purpose is configured to repeat bending while applying tensile force to the test material using the same power source, for example, ``if the test material is large in diameter, an extremely large amount of power will be required, making it impractical for practical use. This invention was made in view of the above-mentioned circumstances, and has a simple structure, is easy to operate, and requires only a small amount of power, and can be used to repeatedly tension and bend even large diameter test materials at the same time. The purpose is to provide a new test method and device that can be tested.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of the tensile bending test apparatus according to the present invention, and FIG. 2 is a cross-sectional view of FIG.

In each figure, reference numeral 1 denotes a frame that is rigidly assembled into a box frame shape using one beam or the like. Reference numeral 2 denotes a swing-shaped reaction force frame that is swingably suspended from the upper frame of the frame 1. 4a
, 4b are bearing housings fixed symmetrically to the upper frame of the frame, and inside these bearing housings 4c, 4b,
Shafts 5a and 5b are pivotally supported by bearings 6a and 6b.

The reaction frames 3a and 3b are swingably supported by shafts 5a and 5b. Reference numeral 7 denotes a material to be run, such as a wire rope, the upper end of which passes through a two-piece support tube 8 inserted into the space between the bearing housings 4a and 4b, and a pressure-bearing socket 9 at the top of the support tube 8. Fixed.

The lower end surface of the support cylinder 8 and the centers of the shafts 5a, 5b are arranged to substantially coincide. The lower end of the test material 7 is received by the open type socket 101.
The lower part thereof forms a frog 11, and a tension rod 12 is suspended between the frogs 11 with a pin 13, as shown in FIG.

The lower part of the tension rod 12 is provided with a male screw 14, and extends through a hole 16 in a receiving plate 15, which is provided across both lower ends of the reaction frames 3a and 3b, and projects to the lower side of this receiving plate 15. ing. A nut 17 is screwed onto this male thread 14. This nut 17 will be described later. 19 is a drive motor that swings the reaction frame; drive motor 9;
The rotational force is decelerated through the V-belt and the primary transmission mechanism 20 and transmitted to the crankshaft 22 which is supported by a bearing 21.

23 is a receiving plate 15 for the crankshaft 22 and the reaction frame.
The receiving plate side end of the connecting rod 23 is swingably connected to a bracket 24 fixed to the side surface of the receiving plate 15 via a pin 25.

In the above configuration, the test material 7 with the pressure-bearing socket 9 fixed to the upper end is inserted into the support cylinder 8, and the test material 7
Insert the lower end into the open socket IQ and tie it.

When the tension rod 12 is pulled downward by an appropriate hydraulic cylinder 25', this tensile force is transmitted to the open socket 1 via the frogmata 11 and the pin 13, and the test material 7 is brought into tension at a predetermined tension. be done. Here, when the nut 17 is turned and screwed toward the receiving plate 15 and tightened to the receiving plate 15, the tension force of the test material 7 is applied to the reaction force frames 3a, 3b.
A tense state is maintained. Then, the hydraulic cylinder 25' is removed. When the motor 19 rotates, the crankshaft 22 also rotates, and the connecting rod 23 makes a piston movement corresponding to the amount of eccentricity of the crankshaft 22, and the receiving plate 15
is swung, and the reaction frames 3a and 3b swing like swings. Due to the swinging of the reaction frame, the test tube 7 is repeatedly bent in the direction of the arrow K--K with the portion corresponding to the lower end of the support tube 8 as the bending point. For example, the amplitude of the reaction force frame is 75
It's about the size of a fence. As is clear from the above operation, a fatigue test by bending is performed with a constant tension applied to the test material 7, such as a wire rope.

As described above, this invention is a swing-like reaction frame that applies tension to a test material such as a wire rope, and swings this reaction frame. It is possible to provide a new test method and device that can perform tests that are not conventionally available, in which both tests are performed simultaneously using the same device.

In addition, according to the present invention, tension is applied to the test village in advance,
Since this tension can be maintained by the reaction frame, the only power required during the test is the swinging force applied to the reaction frame, and the required power is extremely small, for example 60
When performing a tension and bending test on a wire rope of 0 to 90 degrees, even if the swing width is set to about 75 degrees, the motor only needs to have a small capacity of about 3.7KW, making the test extremely economical. .

[Brief explanation of the drawing]

FIG. 1 is a side view showing a part of an embodiment of the present invention in cross section, and FIG. 2 is a front view taken along the E-I line in FIG. 1 and viewed from the Ro-Ro line. . 1... Frame, 2, 3a, 3b... Reaction frame, 7... Test material, 8... Support cylinder, 9...
... pressure bearing type socket, 10... open type socket,
22...Crankshaft. Figure boat diagram N ship

Claims (1)

[Scope of Claims] 1. One end of a test material such as a wire rope is fixed, and the other end is applied a certain tension to the test material against a swingable reaction force frame having a swing center near the fixed point. A method for repeated tensile bending testing of wire ropes, etc., characterized in that the reaction force frame is fixed in the applied state, and the reaction force frame is repeatedly swung to perform repeated bending tests while applying tension to the test material. 2. A base, a holder at one end of the test material fixed to the base, and a reaction force frame swingably attached to the base so that the center of swing is located near the holder. , a holder at the other end of the test material fixed to the reaction frame, a tension applying mechanism that applies tension to the test material by operating both the holders in a direction to separate them, and the reaction frame is repeatedly oscillated. A cyclic tensile bending test device for wire ropes, etc., characterized in that it is equipped with a swinging mechanism that causes the wire rope to bend.