JPS5831538B2 - Unloading device in fatigue testing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an unloading device that operates during a power outage in a material fatigue testing machine, and particularly to an unloading device suitable for simplifying operation settings.

Generally, in a cantilever rotating bending fatigue test in which a test piece is rotated and a bending moment is applied to one end of the test piece, in the event of a power outage, the rotation is stopped and a bending moment is applied only in one direction to the test piece. It is bent and becomes unusable when retesting.

For this reason, conventionally, an unloading device is provided in a weight hanging section that applies a load to a test piece, and the unloading device is operated and set before the start of a test so as to be activated in the event of a power outage.

However, this type of unloading device is provided for each weight hanging part, that is, one for each test piece, so if there are many weight hanging parts, each unloading device The number of operation settings increases in proportion to this, requiring a great deal of time and effort.

The present invention has been made to solve these conventional difficulties, and its purpose is to provide an unloading device for a fatigue testing machine that can simplify the power failure setting operation performed before the start of a test. It is in.

The present invention focuses on the conventional difficulty in that one unloading device is provided for each test piece, and unloads multiple test pieces with a single unloading device. It has been made possible to do so.

The present invention will be described below based on an illustrated embodiment.

FIG. 1 shows a unit testing machine installed for each test piece 2, one end of which is connected to a rotating shaft 3 via a chuck 1, and the other end of the test piece 2 connected to a rotating shaft 3 via a chuck 1. A bearing 4 is attached to the end.

The lower end of a hanging rod 5 is directly connected to this bearing 4, and the upper end of the hanging rod 5 is connected to one end of a stacking rod 8 that swings up and down about a fulcrum 7 provided on a mounting base 6.

A balance weight 9 is provided at the end of the stacking rod 8 on the hanging persimmon 5 side, and a weight 10 is provided at the other end of the stacking rod 8.

The balance weight 9 is used to perform zero point balance adjustment, and the weight 10 is used to apply a bending moment to the test piece 2.

A stopper 11 for the stacking rod 8 is provided at a position below the stacking rod 8 of the mounting base 6, as shown in FIG.

The unit testing machine configured in this way is shown in Figure 2 as 8□t.
As shown by 82 y 83 . . . +8n, a fatigue testing machine is constructed by arranging a plurality of stacking rods in upper and lower two stages in parallel in the horizontal direction.

And each stack is 8□. 82, 83..., 8n, an arm 12 is disposed in the vicinity of the weight 10 in the horizontal direction as shown in FIGS. 8□y 82 y 83 +...
・8n is lifted at the same time to remove the bending moment load caused by the weight 10.

Both ends of the arm 12 are fitted with bearings 1 as shown in FIG.
The swing arms 16 are fixed to the upper ends of slide rods 13 that move up and down guided by the slide rods 4, and the upper ends of swing arms 16 are pivotally connected to the lower ends of the slide rods 13 via pins 15.

As shown in FIG. 4, a gate-shaped metal fitting 17 having an open-ended pin 17a is fixed to the lower end of the swinging arm 16. The female screw member 18 is inserted through the pin 19 that is fitted into the pin 17a.
It can be angularly displaced relative to the

Additionally, a bearing 2 is provided at the tip of the pin 19 as shown in FIG.
0 is attached, and this bearing 20 is adapted to roll on a guide rail 21.

On the other hand, each female screw member 18 is connected to a rotating shaft 2 as shown in FIG.
They are screwed into male screw portions 23a and 23b provided at both ends of the rotary shaft 22, respectively, and have mutually opposite screw threads, and are horizontally movable in mutually opposing directions as the rotating shaft 22 rotates.

The horizontal movement of each female thread member 18 causes the swing arm 16 to swing in the direction of the arrow shown in FIG. 3, and the arm 12 moves upward via the slide rod 13 to move the stacking rod 8
...It is designed to lift 8 at the same time.

As shown in FIG. 2, the rotating shaft 22 is supported by a bearing 24, and a gear 25 is fixed to the intermediate portion in the longitudinal direction, and the rotating shaft 22 is rotationally driven by a drive motor 26 via the gear 25. It looks like this.

Further, a spring 28 is interposed between the female screw member 18 and the receiver 2γ shown in FIG.
The female screw member 18 is always pressed in the direction of moving the slide rod 13 upward by the urging force.

Next, the effect will be explained.

If a power outage occurs during the fatigue test, the drive motor 26 is started by power supplied from a storage battery (not shown) and rotates the rotating shaft 22 via the gear 25.

When the rotating shaft 22 rotates, the conical screw members 18 move horizontally away from each other, and the swinging arm 16 swings in the direction indicated by the arrow in FIG. 3.

Since the lower end of the swinging arm 16 is restricted from vertical movement by the bearing 20 and the guide rail 21, the swinging causes the upper end of the swinging arm 16 to move upward, which causes the slide rod 13 to also move upward. , each stacking rod 8□, 82, 83 . ...8n is lifted at the same time, and the bending moment load on the test piece 2 is removed.

At this time, the stacking rod of arm 12 81 v 82 y 83y
....

The load applied to the swinging arm 16 when lifting 8n is the load applied to the bearing 20.
Since the female threaded member 18 is received by the guide rail 21 via the guide rail 21, no load is applied to the female threaded member 18, and smooth movement of the female threaded member 18 as the rotating shaft 22 rotates is ensured.

Furthermore, when the swing arm 16 swings in the upward direction of the slide rod 13, the drive force from the drive motor 26 and the biasing force of the spring 28 are applied, so a small drive motor 26 is sufficient.

When the bending moment load on the test piece 2 is removed by the arm 12, the drive motor 2 is activated by the operation of a switch (not shown).
6 stops, and the arm 12 is fixed at that position.

When the power outage is canceled, the drive motor 26 is reversely rotated to return the female threaded member 18.

At this time, the load from the slide rod 13 is assisted against the biasing force of the spring 28.

As explained above, this embodiment provides the following effects.

(1) Since a single device can lift and unload multiple stacks at the same time, the power outage activation setting work performed before the start of the test is greatly simplified.

(2) Since the female screw member is always urged by a spring in the direction of moving the arm upward, a small drive motor is sufficient even when lifting a large number of stacking rods at the same time.

The present invention is not limited to the above-mentioned embodiment, and the technical scope of the present invention includes changing the vertical movement mechanism of the arm 12 to other known means.

The present invention has been described above based on preferred embodiments, but according to the present invention, it is possible to simplify the power failure operation setting work performed before the start of the first test.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a unit testing machine, Fig. 2 is a schematic view showing an embodiment of the present invention, Fig. 3 is an enlarged sectional view of the main part of Fig. 2, and Fig. 4 is a side view of Fig. 3. FIG. 2...Test piece, 8,8□+82t 83
y..., 8n...Stack rod, 10...Weight, 12...Arm, 13...Slide rod, 16... - Swinging arm, 18...Female screw member, 22... Rotating shaft, 26... Drive morph, 28... Spring.

Claims (1)

[Claims of Claims] 1. A plurality of unit testing machines are arranged in parallel, each of which has a weight connected to one end thereof and a test piece connected to the other end of a stacking rod that swings up and down with its longitudinal central portion as a fulcrum. In this fatigue testing machine, an arm is placed horizontally across each of the stack bars installed in parallel at a position near the weight below the stack bar, and the load applied to the test piece is measured by lifting the stack bar by upward movement of this arm. An unloading device in a fatigue testing machine characterized by removing. 2 The upper end of a slide rod that moves up and down is connected to both ends of the arm, the upper end of a swinging arm is pivotally connected to the lower end of each slider, and the lower end of each swinging arm is driven to reciprocate in the horizontal direction. The unloading device for a fatigue testing machine according to claim 1, wherein the unloading device is pivotally connected to a mechanism, and the arm is moved up and down by the swinging of the swinging arm accompanying the reciprocating movement of the drive mechanism. . 3. Claim 2, characterized in that a spring is provided that constantly biases the swinging arm in the direction of the swinging force that moves the arm upward, and the stacking rod is lifted by the biasing force of the spring and the driving force of the drive mechanism. Unloading device in the fatigue testing machine described in section.