JPH0610649B2 - Tension vibration test load device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a tension vibration test load device for applying a vibration to an overhead wire of an electric railway and an overhead wire fitting to perform a fatigue test thereof.

"Prior art and its problem" Conventionally, as a tension vibration test load device of this kind, after applying an initial load to the sample by a weight type, the rotation from the transmission is converted into vertical movement by a crank mechanism, It is known that a fatigue test is conducted by applying a periodic vibration load to a sample.

However, in the conventional tension vibration test loader, a weight is used to apply an initial load, for example, a tension of 2 ^TON.
Sometimes it is necessary to change the weight of 300 kg,
This resulted in a heavy burden on the worker. Furthermore, there is a problem that it is not possible to check when the initial disconnection occurred and how the elongation state changed.

The present invention has been made in view of the above circumstances, reduces the labor of the operator by eliminating the work of replacing weights by applying initial tension to the overhead wire, and adds vibration amplitude to the center of the span, It is an object of the present invention to provide a tension vibration test load device capable of measuring the number of repetitions and elongation and checking the fatigue strength while recording.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention converts the rotation from a transmission into a vertical motion by a crank mechanism to center the span of a sample such as a suspended overhead wire. A vibrating device that periodically applies a vibration load to the sample, a tension detector for monitoring the tension fluctuation of the sample, and an elongation detector that detects the elongation generated in the sample by applying the tension vibration. An electric screw type tension load device for constantly applying a set tension to the sample, and a recorder for recording the rotation speed of the transmission and the elongation and tension of the sample are provided.

"Operation" Since the present invention is configured as described above, when the overhead wire extends and tension fluctuation occurs, the screw motor of the tension load device is automatically operated by the signal of the tension detector, The set tension is always applied to the overhead line.

[Examples] Hereinafter, the present invention will be described with reference to the drawings.

1 to 6 show an embodiment of a tension vibration test load device (hereinafter referred to as "load device") of the present invention, in which reference numeral 1 is a base of the load device.

An oscillating device 2 is provided on the bottom of the base 1, and the oscillating device 2 is provided on a transmission 2a and a side portion of the transmission 2a to convert the rotation of the transmission into a vertical motion. And a crank mechanism 2b that operates. A central support member 4 that moves up and down by the crank mechanism is provided above the crank mechanism 2b, and upper and lower guide rollers 4a and 4b that hold an overhead wire (sample) 5 at the span center are attached to the central support member. (See FIG. 3). Further, a left support member 6 and a right support member 7 are fixed to the left and right sides of the center support member 4 on the base 1, and the overhead wire 5 is fixed to the left support member 6.
Upper and lower guide rollers 6a, 6b for holding the
Further, the right support member 7 is provided with upper and lower guide rollers 7a and 7b for sandwiching the overhead wire 5. Further, a left chuck 8 and a right chuck 9 for grasping the overhead wire 5 are provided on both sides of the left and right support members 6 and 7, and the overhead wire 5 is fixed to the left and right chucks 8 and 9 and a predetermined initial load is applied from both sides. Is being pulled by. The left chuck 8 is fixed near the end of the base 1, and the right chuck 9 is attached to a substantially central portion of the base 1 so as to be movable in the left-right direction in FIG. Then, the left and right chucks 8,
The central support member 9, the central support member 4, and the left and right support members are arranged in a straight line on the upper portion of the base 1 so as to be engaged with the overhead wire extending in a straight line.

In FIG. 2, reference numeral 10 is a slide member, which is provided on the upper portion of the base 1 in parallel along the longitudinal direction thereof. The right chuck 9 is provided along the slide member 10 so as to be movable in the left-right direction with respect to the paper surface of FIG. Further, the right chuck 9 is connected to the tension detector 12 via a spring 11.

The tension detector 12 is for monitoring tension fluctuations on the overhead line 5, and the right side of the tension detector 12 is shown in FIGS.
As shown in the figure, a chain 13 is connected, and the chain 13 is adapted to be engaged with the gear wheel 14 in the state of the free end.

Further, the gear 14 is fixed by a shaft 15 to outer gears 16 and 16 installed in parallel so as to sandwich the gear 14, and the gears 16 and 16 are, as shown in FIG. The chains 17, 17 of which one end is a free end are engaged.

A tension load device 19 is connected to the other ends of the chains 17, 17 via springs 18, 18 provided in the vertical direction.

As shown in FIG. 4, the tension load device 19 includes a connecting member 20 installed on the lower end portion of the spring, a shaft body 21 for vertically moving the connecting member 20, and the shaft body 2.
A worm gear 22 for engaging and disengaging the shaft body 21 to move the shaft body 21 up and down, and an electric screw motor 23 for rotating the worm gear 22.

Further, the loading device of the present embodiment is provided with an elongation detector (not shown) that detects the elongation generated in the sample by applying the tension vibration, and the loading device includes the first
As shown in the figure, a recorder 24 for recording the number of revolutions of the vibration device, the extension of the overhead wire, the tension, etc. is provided.

Next, a test method of the present load device configured as described above will be described.

First, the overhead wire 5 is fixed to the left and right chucks 8 and 9 of the load device.

Next, the tension load device 19 applies a predetermined tension to the overhead wire. That is, the electric screw motor 23
Is rotated to rotate the worm gear 22, which moves the shaft body 21 downward, thereby pulling the chains 17 and 17 downward via the spring 18. When the chain 17 is pulled downward, the gear 16
Rotates to rotate the gear 14 fixed by the shaft 15 in the same direction as the gear 16. As a result, the chain 13 wound around the gear 14 rotates toward the free end side (the direction of the arrow X in FIG. 5) to apply a tensile force to the tension detector 12. When tension is applied to the tension detector 12,
This tension is transmitted to the right chuck 9 via the spring 11,
By moving the right chuck 9 on the slide member 10, a predetermined tension is applied to the overhead wire 5. The tension is detected by the tension detector 12, and the tension detector 12 controls the electric screw motor 23 so that a constant tension always acts on the overhead line.

Next, the upper and lower guide rollers 4a, 4b, 6a, 6b, 7a, 7b of the central support member and the left and right support members are moved in the vertical direction to hold the overhead wire 5 at three points. In this state, the overhead line 5 positions the central support member at the center of the span with the left and right support members 6, 7 as fulcrums.

Next, vertical vibration is applied to the central support member 4 that drives the vibration generator 2. That is, the transmission 2a is rotated, and the rotational force of the transmission 2a is converted into vertical movement by the crank mechanism 2b.

In this manner, the overhead line 5 vibrates in the vertical direction at the center of the span supported by the center support member 4 with the right support members 5 and 6 as fulcrums.

As described above, in the load apparatus of the present embodiment, vibration is applied to the overhead wire and the fatigue test is performed.Initial tension is applied to the overhead wire, vibration amplitude is added to the center of the span, and the number of repetitions and elongation are added. Is measured. Furthermore, in this embodiment, the fatigue strength can be inspected while measuring the number of repetitions and elongation and recording by the recorder 24.

Also, when tension fluctuations occur due to the extension of the overhead wire, the screw motor of the tension load device is automatically moved by the signal of the tension detector, and the tension is always applied with an accuracy within the set tension ± 1%. To be

"Effects of the Invention" As described above, in the tension vibration test load device of the present invention, since the electric screw type tension load device for constantly applying the tension set to the sample is provided, the overhead line is initially set. By applying tension, it is possible to eliminate the work of replacing the weight and reduce the labor of the worker. Also,
A tension detector for monitoring tension fluctuations on the sample, an elongation detector that detects the elongation generated in the sample by applying tension vibration, the rotation speed of the transmission, the elongation of the sample,
Since it is equipped with a recorder that records tension, etc., it is possible to measure the repeated frequency and elongation of the overhead wire and check the fatigue strength while recording, so when did the initial disconnection occur? Further, it is possible to check how the stretched state has changed.

[Brief description of drawings]

1 to 6 show an embodiment of a tension vibration test load device of the present invention, FIG. 1 is a front view showing the whole device, FIG. 2 is a plan view showing the whole device, FIG. FIG. 3 is a side sectional view of a crank mechanism and a central support member provided on the crank mechanism, FIG. 4 is a right side view of the apparatus, FIG. 5 is an enlarged side view of a tension detector portion, and FIG. It is the top view which expanded the part of the detector. 2 ... Excitation device, 2a ... Transmission, 2b ... Crank mechanism, 5 ... Overhead wire (sample), 12 ... Tension detector, 19 ...
… Tension load device, 23 …… Electric screw motor, 24
…… Recorder.

Claims (1)

[Claims] 1. Rotation from a transmission (2a) is controlled by a crank mechanism (2b).
Convert it to vertical motion by
Excitation device that applies periodic vibration load to the span center of (5)
(2), a tension detector (12) for monitoring tension fluctuations on the sample, an elongation detector that detects elongation generated in the sample by applying tension vibration, and a tension detector set for the sample Electric screw type tension load device for constantly applying tension
A tension vibration test load device comprising (19) and a recorder (24) for recording the number of revolutions of the transmission, elongation and tension of a sample, and the like.