JPH01320333A - Vibrative energy absorbing device - Google Patents

Abstract

PURPOSE:To prevent lead rings from being damaged and destructed by providing the lead ring housed in a case unit and fixing one end to an internal surface of the case unit in a bracket side while connecting the other end to a supporting bar in its another end through a stopper. CONSTITUTION:A clevis 1 is connected to one end of a supporting bar 4 through a stopper 3 able to adjust a length. The other end of the supporting bar 4 is connected to one end of a lead ring 8a through a stopper 10, and the lead rings 8a, 8b are contained in a case unit. The clevis 1 and a bracket 5 are connected to one end of a member through spherical bearings 2, 6. In this way, the lead rings can be prevented from being damaged and destructed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vibration energy absorbing device that absorbs vibration energy during relative motion in which the distance between two members increases or decreases.

[Conventional technology]

Conventionally, a lead ring 17 made of a lead-based metal as shown in FIG. 6 has been known as a means for absorbing vibration energy of equipment and piping systems in nuclear power plants and the like. This lead ring 17 has vibration absorbing performance as shown in FIG. 7, and was used by connecting both ends to one ends of first and second members (not shown) that move relative to each other in the direction of the arrow.

[Problem to be solved by the invention]

However, with such conventional devices, (1) the mounting dimensions cannot be adjusted;

(2) If a certain amount of load is applied, it will break.

(3) Local buckling occurs.

(4) If a force other than the direction of relative motion is applied, the specified performance will not be achieved and the product will break.

(5) Lead-based alloys are soft and easily damaged.

There were other problems.

The present invention has been made to solve these problems, and its purpose is to provide a vibration energy absorbing device that can prevent damage and destruction of lead rings and that can adjust the mounting dimensions between members. It's about doing.

[Means to solve the problem]

In order to solve the above problems, the present invention provides a clevis that is connected to one member through a spherical bearing and whose distance between the members is relatively displaced, and a stopper whose length is adjustable at the other end of the clevis. a support rod connected to the other member via a spherical bearing, the distance between the members being relatively displaced; a box provided at the other end of the bracket; The lead ring is housed in the body, has one end fixed to the inner surface of the box on the bracket side, and has the other end connected to the other end of the support rod via a stopper.

[For production]

In the present invention, since the lead ring is housed within the box body, damage to the lead ring can be prevented. In addition, the clevis is connected to one end of the support rod via a length-adjustable stopper, and the other end of the support rod is connected to one end of the lead ring via the stopper, so the stopper prevents the lead ring from breaking. At the same time, the mounting dimensions between the members can be adjusted using a length-adjustable stopper. Further, since the clevis and the bracket are connected to one end of the member via a spherical bearing, force acts on the lead ring only in the direction of relative movement, thereby preventing local buckling of the lead ring.

〔Example〕

FIG. 1 shows an embodiment of the present invention, in which reference numeral 1 denotes a clevis rotatably connected via a spherical bearing 2 to one end of a first member that moves relative to each other in the direction of the arrow. One end of a support rod 4 is connected to the other end of the clevis 1 via a turnbuckle 3, so that the length in the axial direction can be adjusted by the turnbuckle 3. Reference numeral 5 denotes a bracket rotatably connected to one end of the second member that moves relative to the direction of the arrow via a spherical bearing 6, and a box body 7 is provided at the other end of the bracket 5.

As shown in FIGS. 2 and 3, lead rings 8a and 8b are accommodated in the box body 7, and one end of each is connected in series in the first and second relative movement directions (arrow directions). has been done. These lead rings 8a and 8b are arranged so that bending stress and shear stress are almost uniform as shown in FIGS. 4(a) and (b).
It is formed in the shape shown in , and has a symmetrical structure. In Figure 4, Zone I is a tensile zone, Zones ■ and Zone ■ are curved zones with equal stress, Zone ■ is a zone with a rounded radius to alleviate stress concentration, and Zone V is a zone where tensile force acts. .

A lead ring flange 9a is provided at the other end of the lead ring 8a, and the lead ring 8 is connected through the lead ring flange 9a.
The other end of a is bolted to the inner surface of the box body 7 on the bracket 5 side. 'Also, a lead ring flange 9b is provided at the other end of the lead ring 8b, and the other end of the support rod 4 is bolted to this lead ring flange 9b via a support rod flange 10.

The turnbuckle 3 and the support rod flange 10 serve as a stopper to prevent the lead rings 8a and 8b from breaking, and when they are displaced beyond a certain level in the direction of the arrow, they come into contact with the cylindrical body 11 provided on the box body 7, and no further damage is caused. It is designed not to be displaced. Further, a box lid 13 having an inspection window 12 is attached to the box body 7.

In the above configuration, if the distance between the first and second members (not shown) increases or decreases beyond a certain level,
The lead ring 8a is used because the turnbuckle 3 and the support rod flange 10 come into contact with the cylindrical body 11 provided on the box body 7 and serve as a stopper.

8b can be prevented from being destroyed. Further, in this embodiment, since the lead rings 8a and 8b are housed in the box body 7, damage to the lead rings 8a and 8b can be prevented.

Furthermore, since the clevis 1 is connected to one end of the support rod 4 via the turnbuckle 3, the mounting dimensions between the members can be adjusted by the turnbuckle 3. Further, since the clevis 1 and the bracket 5 are each rotatably connected to one end of the member via the spherical bearing 2.6, force can be applied to the lead rings 8a and 8b only in the direction of relative movement, and the lead ring Local buckling of 8a and 8b can be prevented.

In the above embodiment, two lead rings 8a,
8b, but if the amount of displacement is small, one lead ring may be accommodated in the box body 7.

Furthermore, the shapes of the lead rings 8a and 8b are shown in FIGS.
) may be made into a shape as shown in FIG.

〔Effect of the invention〕

As explained above, the present invention provides a clevis that is connected to one member through a spherical bearing and whose distance between the members is relatively displaced, and a clevis that is connected to the other end of the clevis through a length-adjustable stopper. a bracket connected to the other member via a spherical bearing such that the distance between the members is relatively displaced; a box provided at the other end of the bracket; and a box housed in the box. Since the lead ring has one end fixed to the inner surface of the box on the bracket side and the other end connected to the other end of the support rod via a stopper, damage and destruction of the lead ring can be prevented, and the member The installation dimension between them is 7J! It is possible to provide a vibration energy absorbing device that can adjust J.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the vibration energy absorbing device according to the present invention, FIG. 2(a) is a front view thereof, and FIG.
) is the same left side view, 4th (c) is the same right side view, Figure 3 is an exploded perspective view of the same example, and Figures 4 (a) and (b) show the structure of the lead ring of the same example. Fig. 5(a)(b)
6 is a perspective view showing a conventional lead ring, and FIG. 7 is a diagram showing its vibration absorption performance. DESCRIPTION OF SYMBOLS 1... Clevis, 2... Spherical bearing, 3... Turnbuckle (stopper with adjustable length), 4... Support rod, 5... Bracket, 6... Spherical bearing, 7...・・・
Box body, 8a. 8b... Lead ring, 9a, 9b... Lead ring flange, 10... Support rod flange (stopper), 11.
...Cylinder body, 12...Inspection window, 13...Box lid. 1L” 1 lease Figure 7 Figure 4 Figure 5

Claims (2)

[Claims] (1) A clevis connected via a spherical bearing to one member whose distance between the members is relatively displaced, and a support rod connected to the other end of the clevis via a stopper whose length is adjustable; A bracket connected to the other member through a spherical bearing such that the distance between the members is relatively displaced; a box provided at the other end of the bracket; and a box housed within the box with one end facing the bracket. a lead ring fixed to the inner surface of the box body and having the other end connected to the other end of the support rod via a stopper. (2) The vibration energy absorbing device according to claim 1, wherein the lead ring has a shape in which bending stress and shear stress are substantially uniform.