JP2015143577A - Vibration reduction stopper of vibration isolating frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration reduction stopper which is not easily broken upon a large earthquake.SOLUTION: A vibration reduction stopper 30 is applied for a vibration isolating frame 10 equipped with a lower frame 14, an upper frame 12, and a vibration control member 16. The vibration stopper 30 includes: a through-hole 34 provided on an upper corner hardware 22 on the upper frame 12; a stopper bolt 32 inserted in the through-hole 34, and fixed to a corner hardware 28 of the lower frame 14 at a tip end; a vibration reduction elastic member 38 inserted in the stopper bolt 32; a clearance X formed between the vibration reduction elastic member 38 and the through-hole 34; a first attenuation washer 50 and a second attenuation washer 56 disposed on upper and lower both end sides of the vibration reduction elastic member 38; a clearance Y formed between the first attenuation washer 50 and the upper corner hardware 22; and a clearance Z formed between the second attenuation washer 56 and the upper corner hardware 22. The vibration reduction elastic member 38 is equipped with a double layer structure composed of an outside layer 42 made from a sliding material and an inside layer 40 made from an attenuating material.

Description

  The present invention relates to an anti-vibration stopper for a vibration isolation gantry, and more particularly to an anti-vibration stopper for preventing the upper gantry of a vibration isolation gantry from being deformed and tilted beyond a certain level due to a large force caused by an earthquake.

  The anti-vibration frame generally includes an upper frame, a lower frame, and a vibration isolation member interposed between the two frames. Loads such as outdoor units of air conditioners are installed on the upper frame, and the load is operated. It absorbs the vibration generated by the anti-vibration member and prevents the load vibration from being transmitted to the installation surface of the lower frame.

  However, when an earthquake or a strong wind occurs, there is a risk that the load will sway with a predetermined amplitude or more and fall. Therefore, as shown in FIG. 5, a stopper bolt 84 is suspended from the upper frame 82 of the vibration isolation table 80, and the stopper bolt 84 is inserted into the through hole 90 of the earthquake-resistant frame 88 provided on the lower frame 86. The elastic members 92, 92 are disposed above and below the seismic frame 88, and a certain gap E is provided between the through-hole 90 of the seismic frame 88 and the cylindrical portions 92a, 92a of the seismic elastic members 92, 92. The formed earthquake-proof stopper 94 was provided (refer patent document 1).

  According to this conventional earthquake-resistant stopper 94, when a large shaking occurs, the earthquake-resistant elastic members 92, 92 collide with the earthquake-resistant frame 88, and the elastic buffering effect prevents the upper pedestal 82 from tilting more than a predetermined angle. Is possible.

JP 7-208542 A

However, in a large earthquake exceeding M7, this shaking continues for a long time, and the seismic frame 88 collides with the seismic elastic members 92 and 92 many times. Further, the collision is not limited to the horizontal direction, and forces in the vertical direction and rotational direction are also applied, and the elastic members 92 and 92 for earthquake resistance are subjected to complicated forces such as twisting and rubbing in addition to compression.
As a result, the elastic members 92, 92 made of rubber, sponge, etc. are repeatedly damaged by complicated forces such as compression, squeezing, and rubbing over a long period of time, and can maintain earthquake resistance. There wasn't.

  The present invention has been devised to solve such a conventional problem, and an external force is applied to the load due to a large earthquake, the upper frame is greatly inclined, and the vibration isolation frame collides with the elastic member for earthquake resistance for a long time. It is an object of the present invention to provide an anti-vibration stopper that does not easily break even when it is done.

  In order to achieve the above object, an anti-vibration stopper for a vibration isolation frame according to claim 1 includes a lower frame fixed to a foundation, an upper frame on which a load is placed, and the lower frame and the upper frame. An anti-vibration stopper applied to a vibration isolation frame having a plurality of vibration isolation members interposed between them and elastically supporting the upper frame, wherein the penetrating hole is provided on either the upper frame or the lower frame. One end of the hole is fixed to either the upper frame or the lower frame, and the other end is inserted into the through hole, and the upper end surface of the hole is inserted into the stopper member. And a lower end surface of the elastic member for vibration reduction that protrudes downward from the through hole, and a first formed between the outer peripheral surface of the elastic member for vibration reduction and the inner surface of the through hole. And when it is inserted through the stopper member, The first damping washer disposed on the upper end side of the elastic member for vibration reduction, the second gap formed between the first damping washer and the through hole, and the stopper bolt are inserted. And a second damping washer disposed on the lower end side of the elastic member for vibration reduction, and a third gap formed between the second damping washer and the through hole, The seismic elastic member has a two-layer structure including an outer layer made of a sliding material and an inner layer made of a damping material.

In the anti-vibration stopper for the vibration isolation frame according to claim 1, the elastic member for anti-vibration has an outer layer made of a sliding material and an inner layer made of a damping material. First, the edge of the through-hole collides with the outer layer, and the sliding effect disperses the force of scoring and rubbing, and the compressive force on the inner layer is relieved.
For this reason, deterioration of the inner layer made of a damping material such as rubber or sponge can be suppressed, and the life characteristics can be improved.
In addition, since the first damping washer and the second damping washer are inserted through the stopper member, when the upper frame vibrates in the vertical direction, the damping energy reduction effect of the damping washer and the compressive impact force relaxation effect It becomes possible to exhibit the damping effect of vibration energy due to.

FIG. 1 is a side view showing the structure of a vibration isolation frame 10 to which the present invention is applied. The vibration isolation frame 10 includes an upper frame 12 and a lower frame 14 that is opposed to the upper frame 12 with a predetermined gap therebetween.
A plurality of vibration isolation members 16 having compression coil springs (not shown) are interposed between the upper frame 12 and the lower frame 14, and the upper frame 12 is mounted on the lower frame 14 by the vibration isolation members 16. Is supported elastically.
The lower gantry 14 is firmly fixed to the foundation 18 of the building by anchor bolts (not shown).

As shown in FIG. 2, the upper frame 12 has a shape in which four upper frame members 20 a, 20 b, 20 c, and 20 d are connected in a rectangular shape via four upper corner hardwares 22.
The first upper frame member 20a and the second upper frame member 20c are provided with two attachment pieces 24, respectively.

  Each mounting piece 24 is provided with a through-hole 26. On each mounting piece 24, mechanical equipment (not shown) that is a load is placed, and a bolt is inserted into the through-hole 26 to be screwed into the load. By fixing, the fixing is realized.

  Similarly, the lower frame 14 has a shape in which four lower frame members are connected in a rectangular shape via four lower corner hardwares 28 (only one lower frame member 29 appears in FIG. 1). )

Anti-seismic stoppers 30 are provided between the upper corner hardware 22 and the lower corner hardware 28, respectively.
FIG. 3 shows the detailed structure of the vibration damping stopper 30, and a stopper bolt 32 as a stopper member is inserted through a through-hole 34 formed in the bottom plate 22 a of the upper corner hardware 22, and further the lower corner hardware 28. Is inserted through a through hole 36 formed in the top plate 28a.

The through hole 34 formed in the upper corner hardware 22 has a sufficiently large diameter compared to the diameter of the stopper bolt 32.
Between the edge portion of the through hole 34 and the outer peripheral surface of the stopper bolt 32, a tubular elastic member 38 for vibration reduction is interposed.

The elastic member 38 for vibration reduction is composed of an inner layer 40 made of an elastic material such as butyl rubber or sponge having a large loss coefficient, and a sliding material having a small coefficient of friction such as Somalite (registered trademark) or fluororesin (for example, a friction coefficient). : A two-layer structure composed of the outer layer 42 composed of 0.2 to 0.4).
A predetermined gap X (for example, 5 mm) is secured between the vibration-reducing elastic member 38 and the edge of the through hole 34.

A plurality of disc springs 44 are disposed on the upper end surface side of the elastic member 38 for vibration reduction.
Between the disc spring 44 and the head 46 of the stopper bolt 32, a first washer 48 made of a metal material and a first damping washer 50 made of a damping material such as fluororesin are interposed. ing.
A predetermined gap Y (for example, 5 mm) is formed between the lower end of the disc spring 44 and the bottom plate 22a of the upper corner metal piece 22.

A large washer 54, a second damping washer 56, and a second washer 58 are stacked between the lower end surface of the elastic member for vibration reduction 38 and the first nut 52.
In addition, a predetermined gap Z (for example, 5 mm) is formed between the bottom plate 22a of the upper corner hardware 22 and the upper surface of the large washer 54. The gap Z is secured by elastically supporting the upper frame 12 on the lower frame 14 by the vibration isolating member 16.

  The distal end of the stopper bolt 32 is inserted into a through hole 36 formed in the top plate 28a of the lower corner hardware 28, and a second nut 60, a third washer 62, a fourth washer 64 and a third nut 66 are inserted. The top plate 28a is fastened and fixed from above and below.

The stopper bolt 32 is attached according to the following procedure.
(1) The stopper bolt 32 through which the first damping washer 50, the first washer 48, the plurality of disc springs 44, and the elastic member 38 for vibration reduction are inserted is inserted into the through hole 34 of the upper corner hardware 22.
(2) Insert the large washer 54, the second damping washer 56, and the second washer 58 from the tip of the stopper bolt 32.
(3) The first nut 52 is screwed from the tip of the stopper bolt 32, and between the head 46 of the stopper bolt 32, the first damping washer 50, the first washer 48, the plurality of disc springs 44, The elastic member 38 for vibration reduction, the large washer 54, the second damping washer 56, and the second washer 58 are fastened and fixed.
(4) After the second nut 60 is screwed onto the tip of the stopper bolt 32, the third washer 62 is inserted.
(5) After the tip of the stopper bolt is inserted into the through hole 36 of the lower corner hardware 28, the fourth washer 64 is inserted and the third nut 66 is screwed.
(6) By tightening the second nut 60 and the third nut 66, the tip end side of the stopper bolt 32 is fixed to the lower corner hardware 28.

When an earthquake occurs and the upper frame 12 and the lower frame 14 vibrate in the horizontal direction or the rotation direction, the edge of the through hole 34 of the upper corner hardware 22 collides with the outer layer 42 of the elastic member 38 for vibration reduction, and the slip By the effect, the compressive force on the inner layer 40 is relieved at the same time as the force of twisting and rubbing is dispersed.
Since the inner layer 40 is made of a damping material such as an elastic material having a large loss coefficient, a large energy absorption effect can be obtained even when a small compressive force is applied.
Moreover, the damping effect of the vibration energy by sliding friction in the first damping washer 50 and the second damping washer 56 can be expected.

When vibration exceeding 1G is applied to the vibration isolation base 10, the bottom plate 22 a of the upper corner hardware 22 collides with the disc spring 44, and the vibration energy is absorbed by the elastic force of each disc spring 44. The
At this time, since sliding friction occurs between the disc springs 44, a more efficient damping effect can be expected.
Further, the effect of reducing the compression impact force by the first damping washer 50 and the second damping washer 56 is exhibited.

As described above, in the case of the vibration damping stopper 30 of the vibration isolation base 10, the vibration damping elastic member 38 has a laminated structure including the outer layer 42 made of a sliding material and the inner layer 40 made of a damping material. In addition, it can effectively disperse and absorb vibration energy when an earthquake occurs.
As a result, even if a large vibration due to an earthquake continues for a long time, the elastic member for vibration reduction 38 is not easily broken, and the earthquake resistance can be maintained.

  In the above, an example in which the tip of the stopper bolt 32 is fixed to the lower corner hardware 28 of the lower gantry 14 and the vibration reducing elastic member 38 is disposed in the through hole 34 of the upper corner hardware 22 of the upper gantry 12 is shown. However, the present invention is not limited to this. That is, the tip of the stopper bolt 32 is fixed to the upper corner hardware 22 of the upper gantry 12, and a large-diameter through hole is formed on the lower corner hardware 28 side of the lower gantry 14, and an elastic member for vibration reduction is formed therein. 38 can also be arranged.

Further, in the above, an example in which a plurality of disc springs 44 are arranged on the upper end surface side of the vibration reducing elastic member 38 is shown, but a plurality of disc springs 44 are arranged on the lower end surface side of the vibration reducing elastic member 38. Of course, it is also possible to make it.
Alternatively, as shown in FIG. 4, a plurality of disc springs 44 can be disposed on each of the upper end surface side and the lower end surface side of the elastic member 38 for vibration reduction. As a result, when the upper frame 12 vibrates in the vertical direction, the bottom plate 22a of the upper corner metal piece 22 collides with the disc spring 44 at two upper and lower positions, so that vibration can be suppressed more effectively. Become.

It is a side view which shows the anti-vibration stand to which the anti-seismic stopper which concerns on this invention is applied. It is a top view which shows the said vibration isolation stand. It is an expanded partial sectional view which shows the anti-seismic stopper which concerns on this invention. It is an expanded partial sectional view which shows the example of a change of the anti-seismic stopper which concerns on this invention. It is an expanded partial sectional view which shows the conventional earthquake-resistant stopper.

10 Vibration isolation stand
12 Upper frame
14 Lower base
16 Anti-vibration material
18 Basics
20a ~ 20d Upper frame member
22 Upper corner hardware
24 Mounting piece
26 Through hole
28 Lower corner hardware
29 Lower frame member
30 Anti-seismic stopper
32 Stopper bolt
34 Upper corner hardware through hole
36 Lower corner hardware through hole
38 Elastic member for vibration reduction
40 inner layer
42 Outer layer
44 Belleville spring
46 Stopper bolt head
48 First washer
50 First damping washer
52 First nut
54 Large washer
56 Second damping washer
58 Second washer
60 Second nut
62 Third washer
64 4th washer
66 Third nut

Claims (1)

A vibration isolation device comprising: a lower frame fixed to a foundation; an upper frame on which a load is placed; and a plurality of vibration isolation members interposed between the lower frame and the upper frame to elastically support the upper frame. An anti-vibration stopper applied to the gantry,
A through hole provided in either the upper frame or the lower frame;
A stopper member having one end fixed to the other of the upper frame or the lower frame and the other end inserted into the through hole;
An elastic member for vibration reduction which is inserted through the stopper member, and whose upper end surface protrudes upward from the through hole and whose lower end surface protrudes downward from the through hole;
A first gap formed between the outer peripheral surface of the vibration-reducing elastic member and the inner surface of the through hole;
A first damping washer that is inserted through the stopper member and disposed on the upper end side of the vibration-reducing elastic member;
A second gap formed between the first damping washer and the through hole;
A second damping washer that is inserted through the stopper bolt and disposed on the lower end side of the elastic member for vibration reduction;
A third gap formed between the second damping washer and the through hole,
An anti-seismic stopper for an anti-vibration base, wherein the elastic member for vibration reduction includes a two-layer structure including an outer layer made of a sliding material and an inner layer made of a damping material.

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