JPH11311585A - Variable impact test apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate an impact test whereat an impact is applied continuously to a test piece in a simple structure. SOLUTION: This apparatus includes a collision mass 3 which collides with a test body 1 at an impact test, thereby applying an impact to the test body 1, vibration stage 7 reciprocated in a vibration direction of the collision mass 3 in the predetermined direction, a leaf spring 4 at the end where the collision mass 3 is attached and which has a base end mounted to the stage 7, and a stage 6 for fixing the test body 1 to the stage 7 to make the test body collide with the collision mass 3 at the vibrating time by the stage 7. At least either a weight of the collision mass 3, a length of the leaf spring 4, a distance between the collision mass 3 and test body 1 or a vibration power of the stage 7 is adjusted, so that a collision stage of the collision mass 3 to the test body 1 can be varied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable impact test apparatus suitable for use in, for example, verifying the impact durability of a canopy seal of a nuclear reactor control rod drive and the impact of other components.

[0002]

2. Description of the Related Art Conventionally, when an impact test is performed on a mechanical part that receives an impact, a colliding member, or the like, the impact strength is measured using, for example, a pendulum-type impact test apparatus as shown in FIG. In the pendulum type impact test device shown in FIG. 4, the hammer 8 is supported rotatably around a predetermined axis, and the impact blade 13 is attached to the hammer 8.

[0003] A test piece 9 is mounted and fixed to the support base 10 so as to collide with the impact blade 13 at the lowest passing point of the hammer 8. A pointer 11 and a scale plate 12 for indicating the impact strength of the test piece 9 are attached around the predetermined axis. In such an impact test apparatus, as shown in FIG.
The hammer 8 (impact blade 13) is caused to collide with the test piece 9 by being lifted up to the direction of arrow C by its own weight from that position. At this time, the impact strength of the test piece 9 is measured by the pointer 11 and the scale plate 12.

[0004]

However, in the above-described conventional impact test apparatus, since the test is performed by swinging the hammer 8 once at a time, it is necessary to continuously perform the test for applying the impact force to the test piece 9. There was a problem that could not be done.
The present invention has been devised in view of such a problem, and provides a variable impact test apparatus capable of easily performing an impact test that continuously applies an impact force to a test piece with a simple structure. The purpose is to:

[0005]

In order to achieve the above-mentioned object, a variable impact test apparatus according to the present invention comprises: a collision mass which collides with a test object during an impact test to apply an impact force to the test object; A vibrating table that is reciprocally driven in the vibration direction to vibrate the collision mass in a predetermined vibration direction, a leaf spring having a collision mass attached to the distal end and a base end attached to the vibration table, and a vibration table A gantry that fixes the test specimen to the shaking table so that it collides with the collision mass at the time of excitation,
By adjusting at least one of the weight of the collision mass, the length of the leaf spring, the distance between the collision mass and the test specimen, and the excitation force of the shaking table, the collision state of the collision mass with the test specimen can be changed It is characterized by having been constituted.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a variable impact test apparatus according to an embodiment of the present invention. FIG. 1 is a perspective view thereof, FIG. 2 is a side view showing a main part (collision part) thereof, and FIG.
FIGS. 3A and 3B are diagrams illustrating a relationship between a collision mass and an impact force and a relationship between an exciting force and an impact force, respectively, in the present embodiment.

As shown in FIG. 1, the variable impact test apparatus according to the present embodiment is for performing an impact test on a test body 1, and includes a load cell 2, a collision mass 3, a leaf spring 4, an adjustment jig 5. , A gantry 6 and a vibration table 7. Specimen 1
Is, for example, a canopy seal for a reactor control rod driving device and other components. Here, the collision mass 3 is for applying an impact force to the specimen 1 by colliding with the specimen 1 at the time of the impact test. A load cell 2 for measuring a force is attached.

The vibrating table 7 is reciprocally driven in the vibrating direction (see the arrow A in FIG. 1) to vibrate the collision mass 3 in a predetermined vibrating direction (a moving direction indicated by an arrow B in FIG. 2). The collision mass 3 is supported by two leaf springs 4 on the vibration table 7. That is, the base end of each leaf spring 4 is attached and fixed to the vibrating table 7 by the adjustment jig 5, and the collision mass 3 is attached to the distal end side of these two leaf springs 4. The collision mass 3 of the present embodiment has a cylindrical shape, and is vibrated by two leaf springs 4 so that the center axis direction thereof is parallel to the vibration direction A (moving direction B) of the vibration table 7. It is supported on a table 7.

The gantry 6 is for fixing the test body 1 to the vibration table 7, and the test body 1 is moved by the gantry 6 on the center axis of the collision mass 3 as shown in FIG. It is fixed so as to face the collision mass 3 (the load meter 2), that is, to collide with the collision mass 3 when the vibration table 7 vibrates. And the variable impact test apparatus of this embodiment is:
The weight (mass M) of the collision mass 3, the length of the leaf spring 4 (the height of the collision mass 3), the distance between the collision mass 3 (actually the load cell 2) and the test piece 1, By adjusting the vibration force T, the collision state (impact force F and speed (number of collisions)) of the collision mass 3 against the test body 1 can be changed. In the present embodiment, the collision mass 3 does not directly collide with the test specimen 1 but collides via the load meter 2.

Since the variable impact test apparatus according to one embodiment of the present invention is configured as described above, the collision mass 3, the leaf spring 4, and the adjustment jig 5 operate the vibration table 7 in the vibration direction. And a structure that vibrates in a vibration direction A (moving direction B in FIG. 2). As described above, the length of the leaf spring 4 (the height of the collision mass 3), the load meter 2 and the test piece 1 By adjusting the interval (see FIG. 2) and the exciting force T by the vibrating table 7, it is possible to freely change and adjust the impact speed (the number of collisions) and the force F to the test specimen 1. I have.

Further, since the variable impact test apparatus of the present embodiment has a structure of a single-degree-of-freedom vibration system in which the leaf spring 4 and the collision mass 3 are combined, the vibration force T
, The vibration system can resonate. Therefore, by causing the resonance phenomenon, the impact force can be continuously applied to the test body 1 by the collision mass 3.

In the present embodiment, a load meter 2 is attached to the collision mass 3, and the impact force is measured by the load meter 2. The impact force F due to the collision mass 3 is, for example,
Can be adjusted by the mass M of the vibration table 7 and the exciting force T by the vibrating table 7, and these relationships are as shown in FIGS. 3 (a) and 3 (b). That is, by increasing the mass M and the excitation force T, the impact force F linearly increases.

As described above, according to the variable impact test apparatus as one embodiment of the present invention, the weight (mass M) of the collision mass 3, the gap between the test body 1 and the load cell 2, and the vibration table 7 By adjusting the excitation force T, the impact force F can be easily adjusted according to the purpose. Further, according to the present embodiment, by adjusting the length (height) of the leaf spring 4 and changing the vibration frequency, the number of impacts (the number of collisions of the collision mass 3) applied to the test piece 1 per unit time can be reduced. It can be adjusted freely, so that it can be easily operated at the test time according to the purpose.

As described above, according to the present embodiment, it is possible to easily perform an impact test in which the impact force F according to the purpose is continuously applied to the test body 1 a predetermined number of times with a simple structure. is there. It should be noted that the present invention is not limited to the above-described embodiment, and can be implemented with various modifications without departing from the spirit of the present invention.

[0015]

As described above in detail, according to the variable impact test apparatus of the present invention, the weight of the collision mass, the length of the leaf spring,
By adjusting at least one of the distance between the impact mass and the specimen and the excitation force of the shaking table, the collision state (impact force and number of collisions) of the impact mass with the specimen can be changed freely. it can.

Also, since a structure of a vibration system having one degree of freedom is formed by combining a leaf spring and a collision mass, the vibration system can be resonated by applying an exciting force by a vibrating table. By causing a resonance phenomenon,
An impact force can be continuously applied to the test piece by the impact mass. Therefore, it is possible to easily perform an impact test in which the impact force according to the purpose is continuously applied to the test body a predetermined number of times with a simple structure.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a variable impact test apparatus as one embodiment of the present invention.

FIG. 2 is a side view showing a main part (collision part) of the variable impact test apparatus as one embodiment of the present invention.

FIGS. 3A and 3B are diagrams illustrating a relationship between a collision mass and an impact force and a relationship between an excitation force and an impact force, respectively, in the present embodiment.

FIG. 4 is a side view showing a conventional impact test apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Test body 2 Load cell 3 Impact mass 4 Leaf spring 5 Adjusting jig 6 Stand 7 Shaking table

Claims (1)

[Claims] 1. A collision mass for applying an impact force to a test object by colliding with the test object during an impact test, and reciprocating drive in the predetermined vibration direction to vibrate the collision mass in a predetermined vibration direction. A shaking table, a leaf spring having the collision mass attached to the tip end side and a base end side attached to the shaking table, and the specimen being vibrated so as to collide with the collision mass at the time of vibration by the shaking table. A table fixed to the table, wherein at least one of the weight of the collision mass, the length of the leaf spring, the distance between the collision mass and the test body, and the excitation force of the vibrating table is provided. A variable impact test device, characterized in that a collision state of the collision mass with respect to the test body can be changed by adjusting.