KR102314390B1 - Vibration Isolation for Case - Google Patents

Abstract

The present invention relates to a seismic isolator for a housing, which comprises a casing, a lower plate, a first spring support body, a first spring, a first spring operation unit, a ball, a second spring support body, a second spring, an upper plate, and a second spring fixing unit. The present invention can reduce vibration transmitted to a housing.

Description

Vibration Isolation for Case

The present invention relates to a seismic isolator for an enclosure that can adjust the tension of a spring according to a load weight when reducing rolling vibrations in the front, rear, left, right, up and down directions, and reflecting the design related to seismic isolation during an earthquake.

Techniques to protect structures in preparation for earthquakes are classified into earthquake-resistance, seismic isolation, and seismic isolation technologies.

Seismic resistance is a concept that bears seismic force as the internal strength of the structure. Through the earthquake damage that occurred in the United States and Japan in the 1990s, it was known that even structures designed according to the seismic design standards could not avoid structural damage due to earthquakes.

Seismic control is a technology that controls the vibrations of structures caused by the seismic force of an earthquake using various vibration damping devices. As a method of vibration suppression, an active control method to reduce vibration by moving the structure in the opposite direction to the vibration by sensing the vibration of the structure and applying a control force from inside and outside the structure, and installing an additional energy dissipation device in the structure There is a passive control method that reduces the damage caused by earthquakes by improving the damping performance of the structure.

The active control method can obtain high vibration control efficiency with a relatively small device and has excellent adaptability to changes in structure and load conditions, but it is not widely used because of its high cost, difficulty in maintenance, and the need for a precise device and external power. not. Active control devices include hydraulic loaders, active mass dampers (AMDs), and active tendon devices.

The manual control method using various types of passive energy dissipation devices is widely used mainly in the United States and Japan because of its simple concept, excellent stability, economical and easy maintenance. The passive vibration damping system has a limitation in vibration damping performance and has the disadvantage of not being able to adapt to changes in structures and load conditions. Examples of passive vibration damping devices include a base isolation system, a viscous/viscoelastic damper, and a tuned mass damper.

The manual control method using various types of passive energy dissipation devices is widely used mainly in the United States and Japan because of its simple concept, excellent stability, economical and easy maintenance. The passive vibration damping system has a limitation in vibration damping performance and has the disadvantage of not being able to adapt to changes in structures and load conditions. Examples of passive vibration damping devices include a base isolation system, a viscous/viscoelastic damper, and a tuned mass damper.

On the other hand, various types of damping for switchboards have been proposed in Korea.

As an example, Korean Patent Registration No. 10-1800871 (hereinafter referred to as 'Patent Document 1') has been proposed.

The patent document 1 can reduce vertical vibration by a coil spring by configuring a coil spring and a rolling plate ball caster in the housing, and by coupling the structure to a ball caster movable on the upper surface of the rolling plate coupled to the upper end of the coil spring. Alternatively, even when the ground vibrates left and right or tilts, it is configured to prevent damage to the earthquake-resistant support and to reduce the vertical and horizontal vibrations of the earthquake-resistant support.

In addition, Korean Patent Registration No. 10-1812188 (hereinafter referred to as 'Patent Document 2') has been proposed.

The Patent Document 2 has a structure using a plurality of springs and balls.

(Patent Document 1) KR10-1800871 B1 seismic support

(Patent Document 2) KR10-1812188 B1 damping module for seismic isolation switchboard

On the other hand, in the body wave, the P wave moves up and down on the surface of the earth, and if the conditions of the ground where the structure is installed are the same, the propagation distance of the seismic wave from the epicenter is much greater than the size of the structure, so it can be said to be constant. Therefore, the structure vibrates up and down in the same phase and can be regarded as a rigid body and does not deform. Therefore, the effect of vertical seismic motion on the structure is small. Therefore, P wave is not important in seismic design.

However, in the case of the S wave, since the earthquake motion has a large acceleration and horizontal motion, the structure also moves in the horizontal direction, and shear force and moment act on the lower end.

Therefore, in seismic design, the vertical component of the earthquake motion is not considered and the horizontal component is generally considered. The domestic building structural design standards (KBC-2005) evaluate the seismic performance using the horizontal acceleration component, and studies on seismic isolators at home and abroad also aim to reduce the horizontal component of earthquake motion.

In the case of Patent Document 1 examined above, it is difficult to expect a smooth vibration damping effect because the structural stability is lowered when vibration in the horizontal direction is generated because it has a structure in which a single ball is coupled to a single spring.

That is, the structure of the rolling plate coupled to one spring has a structure in which the ball caster moves from the rolling plate coupled to only one spring when the lower structure moves in the horizontal direction when vibration occurs in the horizontal direction. Therefore, a smooth support force cannot be formed.

In particular, in the method through a single spring, attenuation is achieved only when one spring serves to attenuate the horizontal vibration and converts the horizontal vibration to the vertical direction. At this time, the force acting in the vertical direction is Since the size of the spring has to be increased in order to attenuate it with the spring of

Moreover, in the method using one spring, since vibration is transmitted only to one spring, the magnitude of the vibration is attenuated only by the constant of the spring, resulting in a problem in that the seismic isolation function is deteriorated.

On the other hand, in the case of Patent Document 2 described above, not only the structure in which the seismic isolation action cannot be made at all, but also the structure in which the size cannot be reduced is formed.

That is, as described above, seismic isolation by earthquake is a concept that increases the rigidity of a structure, which is a concept that increases the rigidity of a structure, or a structure to be protected, unlike vibration suppression, which reduces or attenuates vibration by applying a control force corresponding to the vibration inside and outside the structure. It is a technology to absorb vibration by installing a shock absorber separated from the ground. Because it has a large acceleration and horizontal motion, shear force and moment act.

Therefore, in order to isolate vibration, it is necessary to effectively attenuate the vibration in the horizontal direction. In the case of Patent Document 2, only the vertical direction is attenuated but the horizontal direction is not attenuated at all.

Of course, in the upper housing of Patent Document 2, an auxiliary cushioning member made of a ball-shaped contact member supported by a first spring is configured, but this configuration has a structure that cannot attenuate an earthquake in the horizontal direction. is composed of a structure that cannot perform the seismic isolation function at all.

In addition, the above-mentioned Patent Documents 1 and 2 had a problem in that the configuration for damping the vibration force had to be replaced when the set standard was not reached during the seismic isolation test.

In order to solve the above problems, in the case of an earthquake isolator for a housing according to the present invention, components except for the housing and the upper plate, the second spring, and the second spring fixing part coupled thereto rotate and move at the same time to prevent vibration. The purpose is to attenuate the vibration transmitted to the housing.

Another object of the present invention is to allow the tension of the second spring to be adjusted using the second spring fixing part, so that when the damping force of vibration does not reach the design value, the design value can be reached through tension adjustment without replacement of parts.

Another object of the present invention is to enable use without manufacturing various products when applied to a housing having various loads through the tension control of the spring.

According to the present invention, when an earthquake occurs, the components except for the upper plate, the second spring, and the second spring fixing part coupled thereto are moved simultaneously with rotation to attenuate the vibration, thereby reducing the vibration transmitted to the housing.

In addition, since the tension of the second spring can be adjusted using the second spring fixing part, when the damping force of vibration does not reach the design value, the design value can be reached through tension adjustment without replacement of parts.

In addition, it is a useful invention that can be used without manufacturing various products when applied to a housing made of various loads through adjustment of the spring tension.

1 is a perspective view showing a seismic isolator for a housing according to the present invention.
Figure 2 is an exploded perspective view of Figure 1;
3 is an exploded perspective view of FIG. 2 from another angle;
Fig. 4 is a side cross-sectional view of Fig. 1;

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

First, as shown in FIGS. 1 to 4 , the casing 10 has a closed structure on the front, rear, left, and right sides, and an open structure on the upper and lower sides, and upper plate coupling holes are formed on both upper sides of the casing 10 . (11) is formed, and the lower plate coupling hole 12 is formed on both sides of the lower end, so that other components can be accommodated therein.

Such, the casing 10 may be formed in a form in which two places are divided for coupling in the drawings, but is not limited thereto.

Next, the lower plate 20 is configured to be fixedly coupled to the casing 10 by the lower plate coupling holes 12 formed on both sides of the lower end of the casing 10 described above.

That is, at both ends of the lower plate 20, a lower plate coupling portion 21 is formed so as to be coupled to the lower plate coupling hole 12 formed in the casing 10, and a fixing bolt B1 is formed inside. A first fixing bolt hole 22 capable of being coupled is formed.

Here, the center of the inner circumferential surface of the lower plate 20 may further include a first spring fixing bolt coupling hole 23 for coupling the first spring fixing bolt B2.

Next, the first spring support 30 is disposed on the upper end of the lower plate 20 and is the same as the first fixing bolt hole 22 so as to be fixedly coupled to the lower plate 20 by the fixing bolt B1. A second fixing bolt groove 33 is formed at the position, and is connected to the first spring coupling hole 31 and the first spring coupling hole 31 extending from the bottom to the top and formed inside. and an open hole 32 formed so that the upper end has an open structure.

Here, it is preferable that the spring coupling hole 31 has a larger diameter than the open hole 32 .

Next, the first spring 40 is disposed in the first spring coupling hole 31 constituting the first spring support 30 and may be configured to include the first inner hole 41 to the inside.

The first spring 40 is for offsetting the occurrence of vertical vibration, and may be prevented from being separated by the first spring fixing bolt B2 coupled to the lower plate 20 .

Next, the first spring actuating unit 50 is disposed on the upper end of the first spring 40 and is configured to contact the first spring 40 when a vertical load is generated.

The first spring actuating part 50 is made of a larger size than the first end 51 and the first end 51 inserted into the first inner hole 41 constituting the first spring 40 . It consists of a second end 52 having a ball seating groove 52a formed in a curved shape on the upper side of the support.

Next, the ball (Ball) is arranged to abut against the ball seating groove (52a) of the second end (52) constituting the above-described first spring jokdoup (50) to be rolled in the front, rear, left and right directions. It is a configuration that works.

Next, the second spring support 60 forms a curvature portion 61 in contact with the upper end of the ball on the lower side, and four second spring coupling grooves 62 are formed on the inner circumferential surface of the upper end portion. have.

Next, the second spring 70 is inserted into the second spring coupling groove 62 formed in the second spring support 60 to act to attenuate vibration in the horizontal direction.

This second spring 70 is configured to include a second inner hole 71 on the inside.

Next, the upper plate 80 forms an upper plate coupling portion 81 coupled to the upper plate coupling hole 11 of the casing 10, and the second spring 70 is disposed inside. The second spring fixing part coupling hole 82 is formed.

Here, the upper plate coupling hole 11 formed in the casing 10 is formed to have a larger dimension than the thickness of the upper plate coupling part 81 constituting the upper plate 80, so that the upper plate 80 is upper, It is preferable to be configured to be movable downward.

Next, the second spring fixing part 90 is configured for fixing the second spring 70 by being coupled to the second spring fixing part coupling hole 82 formed in the upper plate 80 .

Here, a thread is formed in the second spring fixing part coupling hole 82 of the upper plate 80 to which the second spring fixing part 90 is coupled, and the second spring fixing part 90 is coupled to the second spring fixing part. A second spring fixing end 92 coupled to the second inner hole 71 of the second spring 70 and a tension adjusting part 91 having a thread on the outer circumferential surface so as to be coupled to the hole 82. can

The operational effects of the seismic isolator for an enclosure according to the present invention having the above configuration are as follows.

First, the earthquake-resistant device 50 for a housing according to the present invention is coupled to a housing (not shown in the drawing) including electrical facilities such as a switchboard and serves to support the housing in normal times. In other words, it is intended to dampen the transmission to the enclosure.

First, in the housing seismic isolator 100 according to the present invention, the first spring 40 is constrained by the first spring support 30 and is arranged to be driven only in the up and down directions, and the second spring 40 Since the first spring actuating part 50 is brought into contact with the upper end, even when vibration occurs in the horizontal direction, the first spring 40 only compresses and expands and is driven only in the up and down directions to attenuate the vibration.

In addition, the second spring 70 is configured to maintain a fixed state with the upper plate 80 as it consists of four places, and the second spring support 60 to which the second springs 70 of four places are coupled is the second spring support 60 . 2 is made to maintain a state coupled to the upper plate 80 by the spring fixing part 90, the lower surface of the second spring support 60 is formed with a curved part 61, the first spring operating part ( 50) and the ball in contact with it.

In particular, a ball seating groove 52a in which a ball can be seated is formed in the second end 52 of the first spring actuating part 50 in contact with the first spring 40 .

Therefore, when vibration in the horizontal direction occurs, even if the first spring 40 vibrates in the horizontal direction, the first spring 40 only compresses and expands. is seated on, and the second spring support 60 has a rotatable shape by a curvature portion 61, so that the casing 10, the lower plate is centered on the enclosure connection bolt B by the curvature portion 61. (20), the first spring support 30, the first spring 40 is rotated and moved by the ball (Ball) to attenuate the vibration to attenuate the vibration transmitted to the housing coupled to the upper plate (80) .

In addition, the second spring 70 and the second spring support 60 are fixed to the upper plate 80, so that the load of the enclosure is attenuated before being transferred to the first spring 40, so that when an earthquake occurs, the load of the enclosure is reduced. vibration can be attenuated.

On the other hand, in the present invention, the second spring fixing part coupling hole 82 of the upper plate 80 is formed with a screw thread, and tension coupled to the second spring fixing part coupling hole 82 of the second spring fixing part 90 . The outer peripheral surface of the adjustment part 91 is also formed with a screw thread.

That is, the tension of each second spring 70 can be adjusted through the tension adjusting unit 91, and through this, when the vibration damping force set by the designer at the time of initial design does not reach the design value, the second spring fixing unit 90 It is possible to adjust the tension through the adjustment of the second spring 70, even without replacing the value designed by the operator can be satisfied.

On the other hand, the present invention is configured in a form in which all components are assembled in the casing 10 , and in particular, fastening devices such as bolts are present only in the casing 10 .

The present invention having such a structure does not cause automatic disassembly due to vibration generation because there are few components that are loosened when vibration occurs, and the size desired by the manufacturer is improved by minimizing the fastening device and reducing the overall size. It is possible to produce it, so it is possible to obtain effects that can be used in various fields.

Moreover, since the present invention enables the tension control of the second spring 70, when applied to a housing having various loads, it is possible to obtain an effect that can be used without manufacturing various products.

Although the above-described embodiment has been described with respect to a preferred embodiment of the present invention, it is not limited to the above embodiment, and various modifications are possible without departing from the technical spirit of the present invention. It is clear to those skilled in the art.

B : enclosure connection bolt
10: casing
11: upper plate coupling hole 12: lower plate coupling hole
83: housing connection bolt coupling hole
20: lower plate
21: lower plate coupling portion 22: first fixing bolt hole
23: first spring fixing bolt coupling hole B1: fixing bolt
30: first spring support
31: first spring coupling hole 32: open hole 33: second fixing bolt groove
40: first spring
41: first inner hole
50: first spring operating part
51: first end 52: second end 52a: ball seating groove
B: ball
60: second spring support
61: curved part 62: second spring defect groove
70: second spring
71: second inner hole
80: upper plate
81: upper plate coupling part 82: second spring fixing part coupling hole
90: second spring fixing part
91: tension control unit 92: second spring fixed end
B2: first spring fixing bolt
100: seismic isolator for enclosure

Claims (3)

a casing having an upper plate coupling hole formed on both sides of the upper side and a lower plate coupling hole formed on both sides of the bottom, the front and rear surfaces of which are open;
a lower plate including a lower plate coupling portion coupled to the lower plate coupling hole of the casing, and including a first fixing bolt hole to which the fixing bolt is coupled to the inside;
A second fixing bolt groove disposed on the upper end of the lower plate and disposed at the same position as the first fixing bolt hole of the lower plate is formed, fixedly coupled to the lower plate by a fixing bolt, and extends from the bottom to the top and formed inside a first spring support body including a first spring coupling hole and an opening hole that is connected to the first spring coupling hole and has an open upper end;
a first spring including a first inner hole inwardly disposed in a first spring coupling hole formed in the first spring support;
A first end coupled to the first inner hole of the first spring and a second end disposed above the first end and having a larger size than the first end and including a ball seating groove formed in a curved shape at the upper end A first spring actuating unit made of;
a ball seated in a ball receiving groove formed at a second end constituting the first spring actuating unit;
a second spring support in contact with the upper end of the ball, but forming a curvature on the lower side so that the ball can slide, and including four second spring coupling grooves on the inner circumferential surface of the upper end;
a second spring inserted into the second spring support and having a second inner hole on the inside;
an upper plate including an upper plate coupling part coupled to an upper plate coupling hole formed in the casing, and having a second spring fixing part coupling hole and an enclosure coupling bolt coupling hole formed inside;
and a second spring fixing part coupled to the second spring fixing part coupling hole of the upper plate and having one end inserted into the second inner hole of the second spring.
The enclosure according to claim 1, wherein the upper plate coupling hole formed in the casing consists of a hole having a larger shape than the thickness of the upper plate coupling part formed in the upper plate, and the upper plate is configured to move in the up and down directions. isolator.
According to claim 1, wherein the second spring fixing part coupling hole formed in the upper plate is made in the form of a screw thread, the second spring fixing part is a tension adjusting unit whose height is adjusted by a screw thread in the second spring fixing part coupling hole and the first. 2 A seismic isolator for an enclosure, characterized in that it comprises a second spring fixing end inserted into the second inner hole formed in the spring to support the second spring.

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