JPS62172237A - Apparatus for testing fatigue of cable - Google Patents

Abstract

PURPOSE:To accurately grasp the fatigue characteristics of a cable, by applying bending to a specimen having a wt. mounted thereto by moving a pulley up and down by a drive mechanism and imparting a twist to the specimen by reciprocatingly rotating the wt. through a rotary body. CONSTITUTION:When a motor 8 is driven and a drive shaft 10 is driven so as to rotate by 180 deg. to move a pulley support member 4 upwardly, a pulley 5 also moves upwardly and a wt. 18 is pulled up by a specimen cable 14 through a bearing 18a to be moved upwardly in a rotary body 19. When the shaft 10 further rotates, the member 4 moves downwardly and the pulley 5 also moves downwardly and, therefore, the wt. 18 moves downardly in the rotary body 19 under its own wt. Therefore, bending is imparted to the cable 14 at the time of the up-and-down movement of the pulley 5. When the shaft 10 makes one revolution, a connection shaft 24 rotates by 180 deg. through bevel gears 22, 23. Whereupon, a gear 18 reciprocatingly revolves by an angle theta through a crank 26 and an arm 27 and, therefore, the wt. 18 rotates by 180 deg. along with the rotary body 19 during upward movement and rotates by 180 deg. to the reverse direction along with the rotary body 19 during downward movement. Therefore, bending and a twist are simultaneously applied to the specimen cable 14.

Description

Detailed Description of the Invention (Technical Field of the Invention) The present invention relates to a fatigue testing device for cables, and in particular to a fatigue testing device δ that can simultaneously apply bending and twisting to a sample cable and conduct a fatigue test on the same. .

(Technical Background of the Invention) Since cables are subjected to bending during and after installation, there is a risk that their electrical characteristics may deteriorate. For this reason, after manufacturing a cable, a part of the cable is attached to a bending testing device as a sample cable, and the cable is repeatedly bent, and then the electrical characteristics of the sample cable are investigated.

Incidentally, during and after installation, the cable actually undergoes not only bending but also torsion. Therefore, it is preferable to bend and twist the sample cable at the same time and then examine its electrical properties, since this allows a more accurate understanding of the electrical properties of the cable after installation.

(Object of the Invention) An object of the present invention is to provide a cable fatigue testing device that can simultaneously apply bending and twisting to a sample cable.

(Summary of the Invention) The present invention involves winding a sample cable with one end fixed around a pulley attached to a pulley moving member, attaching a weight to the other end of the sample cable, and moving the pulley moving member up and down using a drive mechanism. By moving the cable, a pulley bends the sample cable, and a reciprocating rotation mechanism linked to the drive mechanism causes a weight that moves up and down via a rotating body to reciprocate, giving the sample cable a twist at the same time. It is characterized by

(Embodiments of the Invention) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The fatigue testing apparatus according to the present invention includes a rectangular frame 1, as shown in FIG. One side wall I of this frame 1
A extends upward, and a support plate 2 bent in the horizontal direction is integrally formed at the upper end of the extension part la.

Further, another support plate 2' projects from approximately the center of the side wall IA, facing the support plate 2. Support plate? , 2', a support rod 3.3 extending vertically is positioned and fixed. A pulley moving member 4 is supported by these support rods 3.3 in a vertically movable manner. A shaft 4a projects horizontally from an end surface of the pulley moving member 4, and a pulley 5 is rotatably supported on the shaft 4a.

A drive mechanism 6 for moving the pulley moving member 4 up and down is provided on the top surface of the top wall IB of the frame 1. That is, this drive mechanism 6 includes a motor 8 fixedly fixed to four parts of a base 7 fixed to one end side of the ceiling wall IB, and a shaft 8a of the motor 8 coaxially connected to the shaft 8a of the motor 8 via a coupling 9. The shaft 8a and the drive shaft 10 are each rotatably supported via bearings 11.11. The tip of the drive shaft lO is the extension part 1a of the side wall IA.
It penetrates in the thickness direction, and one end side of the link member 12 is fixed. One end side of another link member 13 is rotatably supported on the other end side of the link member 12, and this link member 1
The other end of the pulley moving member 3 is rotatably supported by another shaft 4b that protrudes toward the extension portion la of the pulley moving member 4. Therefore, when the motor 8 is driven to rotate the drive shaft 10, one link member 12 rotates, and the other link member 13 swings while applying upward and downward suppressing force to the shaft 4b. . Therefore, every time the motor 8 (shirt) 8a (drive shaft 10) rotates once, the pulley support member 4 moves up and down along the support *a3.3 via the pair of link members 12.13.

A sample cable 14 is wound around the pulley 5.

One end of this sample cable 14 is connected to the protrusion 2' of the support plate 2'.
It is clamped and fixed by a fixture 15 which is swingably attached to a.

That is, as shown in FIG. 2, the fixture 15 includes a pair of clamp members 16, 16', each of which is provided with a screw hole 16a, 16'a. One of the clamp members 16 has a connecting rod 16C protruding from the lower surface and swingably connected to a metal fitting 2'b embedded in the protrusion 2'a. Then, one end of the sample cable 14 is clamped with each clamp member 16, 16' through the grooves 16b, 16'b, and the port 17 is screwed into the screw holes 113'a, 16a. One end is fixed. In addition, another fixture 1 is attached to the other end of the sample cable 14.
A weight 18 is attached via 5'. That is, as shown in FIG. 3, this fixture 15' has the same structure as the fixture 15 described above, and a weight 18 is fixedly connected to the lower end of the connecting rod L6c.

The shaft 18 is disposed within a cylindrical rotating body 19. This rotary body 19 is rotatably supported by a pair of brackets 20, 20' which project horizontally from the side wall IA of the frame 1 via bearings 21,21. A long hole 19a is provided in the peripheral wall of the rotating body 19 along the axial direction (vertical direction).
A bearing 18a protruding from the circumferential surface of the weight 18 is positioned within the bearing 9a. On the other hand, the drive shaft 10 has a hevel gear 22.
is attached, and another bevel gear 23 meshes with this bevel gear 22. These bevel gears 22.23
has a gear ratio of 1:2, and when one bevel gear 22 rotates twice, the other bevel gear 23 rotates once. The other bevel gear 23 is attached to the upper end of the interlocking shaft 24, and extends downward through the interlocking shaft 24 through the ceiling wall IB of the frame body 1.
A substantially central portion thereof is rotatably supported by a support member 3o protruding from the side wall IA. A crank 26 constituting a reciprocating rotation mechanism 25 is attached to the lower end of the interlocking shaft 24. As shown in FIGS. 1 and 4, one end of an arm 27 is rotatably supported by the crank 26, and the other end of the arm 27 is supported by a large-diameter gear 28. Is this gear 28 a bracket? Shaft 20' protruding from the lower surface of 0'
It is rotatably attached to a and is engaged with a small diameter gear 29. This gear 29 is fixedly attached to a shaft 19b coaxially protruding from the lower end of the rotating body 19.

By the way, in the reciprocating rotation mechanism 25, when the crank 26 rotates 90 degrees in the direction of the arrow shown by the solid line (see FIG. 4) due to the rotation of the interlocking shaft 24, and one end of the arm 27 is displaced to the P2 position, the other end of the arm 27 is moved. The end is displaced to the Q2 position while rotating the gear 28 by an angle θ. Gear 29 is gear 28
has a gear ratio that rotates 1800 degrees in the direction of the arrow when rotated by the angle θ, so the rotating body 19 rotates 180' in the same direction via the gear 29. Therefore, weight 18
rotates together with the rotating body 19 because the elongated hole 19a of the rotating body 19 contacts the bearing 18a and applies a pressing force. Therefore, the sample cable 14 is given a twist of 180'. In addition, the crank 26 rotates 180°,
When one end of the arm 27 is displaced to the P3 position, the arm 2
The other end of 7 returns to position Q and rotates the gear 28 in the opposite direction by an angle θ, so that the rotating body 19 rotates 180° in the opposite direction via the gear 29. Therefore, sample cable 1
4 twists are removed. Furthermore, the crank 26 is 270°
When the arm 27 rotates and one end of the arm 27 is displaced to the P4 position,
Since the other end of the arm 27 is displaced to the Q3 position and rotates the gear 28 by θ' (=θ) in the direction of the arrow, the rotating body 19 continuously rotates by tao' in the opposite direction via the gear 29. Therefore, the sample cable 14 is twisted in the opposite direction. When the crank 26 rotates 3600 times and one end of the arm 27 returns to the P7 position, the other end of the arm 27 also returns to the Q1 position, so the gear 28 rotates in the opposite direction by θ'. Therefore, the rotating body 19 rotates via the gear 29 in a direction that removes the twist in the sample cable 14, so that the cable 14 returns to its untwisted state.

Next, the operation of the fatigue testing apparatus of the present invention will be explained.

When the motor 8 is driven and the drive shaft 10 is rotated 180 degrees to move the pulley support member 4 upward, the pulley 5 also moves upward, so that the weight 18 is guided into the elongated hole 19a via the bearing 18a and is attached to the sample. The rotating body 19 is pulled up by the cable 14.
move up within. When the drive shaft 10 is further driven 1800 rotations and makes one rotation, the pulley support member 4 moves downward and the boot 95
Since the weight 18 also moves downward, the weight 18 moves downward within the rotating body 19 due to its own weight. Therefore, the sample cable 14 is bent when the pulley 5 moves up and down.

On the other hand, when the drive shaft 10 rotates once, the bevel gear 22.2
3, the connecting shaft 24 rotates by 1800 degrees. When the connecting shaft 24 rotates 180 degrees, the gear z8 reciprocates by the angle O via the crank 26 and the arm 27, as described above, so that the weight 18 is rotated by the rotating body 19 during its upward movement.
and rotates 180° in the opposite direction together with the rotating body 19 during the downward movement. Therefore, during the second movement of the pulley 5, a twist of 180° is applied to the sample cable 14, and during the downward movement, the twist in the sample cable 14 is removed. Therefore, the sample cable 14 is subjected to bending and twisting at the same time.

When the drive shaft IO rotates twice, the pulley 5 moves up and down via the pulley moving member 4, so that the sample cable 14 is similarly bent. In addition, in this case, the connecting shaft 2
4 further rotates by 180 degrees and makes one full rotation, so the gear 28 reciprocates by θ' in the opposite direction via the crank 26 and arm 27.

Therefore, during the upward movement of the weight 18, a twist of 180° is imparted to the sample cable 14 in the opposite direction, and this twist is removed during the downward movement. Therefore, the sample cable 14 is simultaneously subjected to bending and twisting in the opposite direction.

After repeating the above operations and repeatedly bending and twisting the sample cable 14, the sample cable 14 is removed from the fatigue testing apparatus of the present invention and its electrical characteristics are investigated.

In the above embodiment, the twist angle applied to the sample cable 14 may be changed by changing the gear ratio of the gear 28 and the gear 29.

(Effects of the Invention) According to the present invention, the drive mechanism moves the pulley up and down via the pulley moving member to bend the sample cable to which the weight is attached, and the reciprocating rotation mechanism is linked to the drive mechanism. By reciprocating the weight via the rotating body to impart twist to the sample cable, bending and twisting can be imparted to the sample cable at the same time. Therefore, it is possible to provide a cable fatigue testing device suitable for more accurately understanding the electrical characteristics of a cable after installation.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a fatigue testing device according to the present invention, Fig. 2 is an exploded perspective view of a fixture for fixing one end of a sample cable, and Fig. 3 is a perspective view of a fixture for fixing one end of a sample cable. FIG. 4 is an exploded perspective view of the fixture and is an explanatory diagram of the operation of the reciprocating rotation mechanism. 1--1-----Frame body, LA--1--Side wall, 4--------Pulley moving member, 5-1----
---Pulley, 6----------Drive mechanism, 8--Motor, io--Drive shaft, 12.13-- - Link members. 14--------One sample cable, 15.15'---One fixture, ta---One weight, 18 a---One bearing, 19------ --- One rotating body, L9a --- One long hole, 24 --- Series moving shaft, 25 --- One reciprocating rotation mechanism, 26 ------ --Crank, 27--Arm, 28.29--Gear. j1!2 Prisoner 1-----1-----Frame body IA----------Image 1 Wall 4-11~--------Pulley 8 Tall member 5-----1 ---Pulley 6-=-11+--Driver vJ mechanism 8--1--Motor 10--1 Drive shaft 12, 13--Link member +4- One---
--- Sample cable j5, +5' --- Fixture 18 ---
---Zhonggu a----M-Bearing 19---11---Rotating body J9a----One elongated hole 24----One--Series moving shaft 25--- -1111 Reciprocating rotation horizontal battle 26-----------Quonk 27-----Arm 28.29--Gear 1st prisoner

Claims (1)

[Claims] a pulley moving member rotatably attached to a pulley for winding a sample cable supported to be movable up and down and having one end fixed; a drive mechanism for moving the pulley moving member up and down; a weight attached to the other end of the suspended sample cable; a rotating body that rotates while guiding the weight vertically in response to the vertical movement of the pulley moving member; and a rotating body that rotates in conjunction with the drive mechanism. A cable fatigue testing device characterized by comprising a reciprocating rotation mechanism for reciprocating a body.