KR102427497B1 - Earthquake-proof device for distribution Board - Google Patents

Abstract

The present invention provides a new earthquake-resistant device for a distribution board. The earthquake-resistant device for a distribution board includes: a frame that is fixed or coupled to the lower part of an enclosure of the distribution board, and is an earthquake-resistant frame whose interior is open at least downward; a plurality of ball transfers coupled to the lower surface of the earthquake-resistant frame and having bearing balls inserted into a body to impart horizontal fluidity to the earthquake-resistant frame; a plurality of elastic members coupled to the lower surface of the earthquake-resistant frame to damp vertical vibrations generated from the ground surface or the floor surface of a building; a fixture disposed in an open area inside the earthquake-proof frame and fixed to the ground surface or the floor surface; and a plurality of spring damper modules having one end coupled to the fixture and the other end coupled to the inner surface of the earthquake-resistant frame, and returning the earthquake-resistant frame to an initial position when the horizontal position of the earthquake-resistant frame is changed by external force. Each of the spring damper modules includes a damper in which elastic bodies having different elastic moduli are connected in series and connected in parallel with the elastic bodies to absorb vibration of the elastic bodies.

Description

Earthquake-proof device for distribution Board}

The present invention proposes a new earthquake-resistant device that can prevent a switchgear from partially or entirely stopped due to mechanical and electrical damage caused by external shocks caused by an earthquake or the like.

A switchgear is an electrical facility that receives power from a power supplier and safely supplies it to a user, and is a facility used for monitoring, control, and protection of the power system.

Such a switchgear is composed of a structure that attaches and supports unit devices such as circuit breakers or protective relays, and an assembly of conductors that electrically connect the unit devices, and these various unit devices are safely insulated and stored in a hexahedral steel enclosure.

Since various unit devices included in the housing of the switchboard are very vulnerable to vibration and shock, a vibration-proof means to prevent the vibration transmitted to the switchboard should be provided. The conventional switchgear is composed of an assembly of conductors that electrically connect various unit devices in an enclosure. In the state where these various unit devices are built-in, they are directly fixed to the floor of a building and installed without an earthquake-resistant device, so that external shocks caused by earthquakes are intact. There was a transmission problem. In recent years, seismic design has become mandatory for communication and power facilities, and in this regard, various seismic technologies for switchgear are being developed in a situation where seismic design is essential for switchgear as well.

For example, according to Patent Registration No. 10-1561039, a switchgear with anti-vibration and seismic performance is proposed, and the used dust-proof and seismic device is installed at the corners of the lower four places of the enclosure and, if necessary, between the corners and corners. It consists of a plurality of seismic spring modules that become, the seismic spring module has an outer shape and a urethane outer tube made of a urethane material in a cylindrical shape; A compression spring for relieving the compression force by the elastic stress of the spring by compression deformation of the spring; a tension nut spring in which the spring is tensilely deformed to relieve the tensile force with the elasticity of the spring; two module covers respectively installed on the upper and lower portions of the urethane outer cylinder to prevent the compression spring and the tension nut spring from being separated to the outside; an upper module base having a lower portion coupled to an upper portion of the module cover, and an upper portion being coupled to an enclosure base of the enclosure; The lower part is coupled to the foundation or base pedestal of the power distribution box, and the upper part is coupled to the lower part of the module cover to uniformly transfer the load of the cubicle and the stress generated by earthquakes or vibrations to the base or base trestle of the power distribution box. It is composed of a lower module base. Although this switchgear has an effect of reducing vibration with the urethane outer cylinder 11 and the compression spring 12, only a limited effect can be obtained because the earthquake-resistant device is manufactured in a fixed form.

In addition, according to Patent Registration No. 10-1341152, as a switchgear equipped with a seismic device, it is provided under the enclosure 20 of the switchboard to absorb the seismic waves flowing from the ground surface 10 so that the vibrations or impacts of the seismic waves are applied to the enclosure of the switchboard. In the switchboard provided with a seismic resistance device for damping the transmission to (20), the lower surface is fixedly coupled to the ground surface (10), the lower support portion (30) provided with an accommodating space (31) therein; a movable part 40 provided in the accommodation space 31 to be movable up and down; a pair of side cylinder parts 70 provided on both left and right sides of the accommodation space 31 to fix or release the movable part 40; a plurality of lower elastic supports 90 provided at a predetermined interval in the lower portion of the accommodating space 31 and disposed between the lower support part 30 and the movable part 40 to elastically support the movable part 40; The upper part is fixedly coupled to the lower part of the housing 20 of the switchboard, and the lower surface is in contact with the upper surface of the movable part 40 and is formed to be slidably movable; and an upper cylinder part 80 provided in the center of the upper support part 50 to fix or release the movable part 40 . Vibration is controlled by the lower elastic support body 90, the side cylinder part 70, the upper cylinder part 80, etc. of the switchgear, but there is a disadvantage in that it takes a high cost to construct the device due to the complexity of the structure.

The seismic device specialized for switchgear basically reduces the shock generated by earthquakes, etc. to prevent damage to internal electrical parts, etc. to prevent the deterioration of its function, and at the same time, the simple structure reduces the manufacturing cost and manufactures An easy-to-use device is preferred. In addition, even if the earthquake-free state continues for a long time, maintenance and repair costs for seismic devices are not required. .

The present invention was created under the above-described technical background, and an object of the present invention is to simultaneously reduce vertical and horizontal shocks generated externally such as earthquakes, and to prevent position changes due to external force to prevent damage to the switchgear. to provide the device.

Another object of the present invention is to provide a seismic device for a switchgear that has a simple structure to reduce manufacturing cost, can be manufactured in a short time, and can be easily modularized.

Another object of the present invention is to be able to effectively absorb and attenuate the shock of an earthquake automatically without any separate operation or control when an earthquake occurs, so that a seismic device for switchgear is not required during normal times when earthquakes do not occur. is to provide

In addition, other objects and technical features of the present invention will be presented in more detail in the following detailed description.

In order to achieve the above object, the present invention is a seismic frame that is fixed or coupled to the lower part of the switchgear enclosure, the inside of which is open at least downward; a plurality of ball transfers coupled to the lower surface of the seismic frame and having a bearing ball inserted into the body to impart horizontal fluidity to the seismic frame; a plurality of elastic members coupled to the lower surface of the seismic frame to damp up and down vibrations generated on the ground surface or the floor surface of a building; a fixture disposed in the open area inside the earthquake-resistant frame and fixed to the ground surface or the floor surface; A plurality of spring damper modules having one end coupled to the fixture and the other end coupled to the inner surface of the earthquake-resistant frame, and restoring the earthquake-resistant frame to its initial position while attenuating horizontal vibration when the horizontal position of the earthquake-resistant frame is changed by an external force; includes; and, the spring damper module has elastic bodies having different elastic moduli connected in series to damp vibration shocks in response to vibrations having different strengths, and the elastic modulus is to cushion the vibrations of the elastic body when the elastic body vibrates by an external force. and a damper connected in parallel with another elastic body, wherein the elastic member and the ball transfer as a pair are disposed at the same position in the lower part of the earthquake-resistant frame, and the elastic member is positioned between the lower surface of the earthquake-resistant frame and the ball transfer, so that the ball transfer is performed The bearing balls of the ball transfer are in direct contact with the floor surface to enable rolling motion with respect to the floor surface, a plurality of elastic members and a pair of ball transfers are arranged at equal intervals on the lower surface of the earthquake-resistant frame, and a plurality of spring damper modules are provided in the earthquake-resistant frame It provides an earthquake-resistant device for a switchgear, which is disposed symmetrically on the inner surface and provides the same tension to each coupling site of the earthquake-resistant frame.

In the seismic device of the present invention, the elastic body included in the spring damper module may be used, for example, by connecting two elastic bodies having different elastic modulus in series. It is also possible to apply what is formed to have, or a helical structure having a partially different outer diameter in one elastic body.

The switchgear provided with the earthquake-resistant device according to the present invention attenuates the transmission of vibrations and shocks caused by earthquakes, so that the switchgear is mechanical. It is possible to prevent deterioration of its function by preventing electrical damage.

In order to attenuate the transmission of vibrations or shocks generated by external forces such as earthquakes, the switchgear having the seismic device according to the present invention can firmly fix the switchgear enclosure lower surface and the seismic frame to each other with a simple configuration, and as a result, earthquake resistance It is possible to reduce the manufacturing cost of the device, and to install the seismic device in the switchboard with a simple process.

In addition, according to the present invention, even if an earthquake does not occur, maintenance and repair costs of the switchgear seismic device are not required, and the seismic device is modularized to be compatible with switchgears of different shapes and sizes, so that it can be effectively applied to various switchgears.

1 is a side view showing a switchgear installed on the top of the earthquake-resistant device of the present invention;
2 is a plan view of the seismic device of the present invention;
3 is a schematic view showing a side cross-section and the inside of the seismic device of the present invention
4A and 4B are plan views showing a spring damper module according to a first embodiment of the present invention;
5A and 5B are plan views showing a spring damper module according to a second embodiment of the present invention;
6A and 6B are plan views showing a spring damper module according to a third embodiment of the present invention;
7 is a perspective view of a fixing unit of the seismic device;
8 is a perspective view and a cross-sectional view showing the ball transfer structure of the earthquake-resistant device;
9 and 10 are schematic views showing the vibration damping mechanism of the spring damper module.

The present invention proposes an earthquake-resistant device capable of preventing the switchgear from being damaged or stopped due to mechanical or electrical damage due to an impact generated by a tectonic change such as an earthquake, and a switchgear having the same.

The seismic device for switchgear of the present invention basically controls horizontal vibration while absorbing vertical and horizontal vibrations and distributes vertical vibration, while maintaining equilibrium when temporary shock or continuous vibration caused by external force occurs, and after the vibration is completed It can be quickly restored to its original state.

The earthquake-resistant device of the present invention basically includes a frame fixed or coupled to the lower part of the switchgear housing, a ball transfer coupled to the lower surface of the earthquake-resistant frame, an elastic member coupled to the lower surface of the earthquake-resistant frame, a fixing base fixed to the center of the earthquake-resistant frame, and the It includes a plurality of spring damper modules coupled to the fixture and the seismic frame.

The earthquake-resistant frame may be formed of a material having rigidity, such as metal, reinforced plastic, or a composite material, and a prismatic structure or a circular structure having at least an interior open downward may be used. The fixing rod is disposed on the inner opening of the earthquake-resistant frame, and preferably, the fixing rod is fixed to the ground surface or the floor in a state in which it is arranged in the center of the internal open area of the earthquake-resistant frame.

The ball transfer coupled to the lower surface of the seismic frame includes a body and a bearing ball inserted into the body, and provides horizontal fluidity to the seismic frame by a freely rotatable bearing ball inserted into the body. In addition, the elastic member coupled to the lower surface of the earthquake-resistant frame serves to damp the vertical vibration generated on the ground surface or the floor surface of the building.

One end of the plurality of spring damper modules is coupled to the fixture and the other end is coupled to the inner surface of the earthquake-resistant frame, and when the horizontal position of the earthquake-resistant frame is changed by an external force, it basically functions to quickly return the earthquake-resistant frame to its initial position. . In addition, the plurality of spring damper modules serve to disperse vertical vibration together with the elastic member and control horizontal vibration together with the ball transfer.

To this end, in the spring damper module, elastic bodies having different elastic modulus are connected in series to damp vibration shocks in response to vibrations having different strengths, and when the elastic body vibrates by an external force, the elastic modulus is increased to cushion the vibration of the elastic body. It includes a damper connected in parallel with another elastic body. In addition, it is preferable that the plurality of spring damper modules are symmetrically disposed on the inner surface of the earthquake-resistant frame and provide the same tension to each coupling portion of the earthquake-resistant frame.

In the spring damper module, the elastic body is a helical structure in which two elastic bodies having different elastic modulus are connected in series, one elastic body is formed to have different pitches, and one elastic body has a partially different outer diameter. It can be used to form a, and the structure and function of such an elastic body will be described later.

While effectively absorbing and distributing horizontal and vertical vibrations applied to the earthquake-resistant device, for ease of manufacture and modularity of the earthquake-resistant device, the elastic member and the ball transfer are disposed at the same position in the lower portion of the earthquake-resistant frame, and the lower surface of the earthquake-resistant frame and the ball An elastic member may be positioned between the transfers.

In addition, when the plurality of elastic members and the ball transfer are disposed on the lower surface of the seismic device, the bearing balls of the ball transfer are positioned so that the elastic member is positioned between the lower surface of the seismic frame and the ball transfer so that the ball transfer can roll with respect to the floor surface. Direct contact with the floor surface is preferable in terms of vertical vibration and horizontal vibration damping effect, and an elastic member and a ball transfer are arranged as a pair on the lower surface of the earthquake-resistant frame, and a plurality of elastic members and a ball transfer pair are arranged at the same distance from each other It is preferable to be

The seismic device for switchgear of the present invention can minimize the deterioration of its function even if the seismic device does not operate for a long time during normal times when an earthquake does not occur, and has a simple structure, eliminating the need for manpower and parts costs for maintenance. In addition, in the event of an earthquake, seismic waves can be effectively absorbed and reduced with the performance of the initial installation state without deterioration of the function, thereby effectively preventing the switchgear from being damaged and its function from being deteriorated or stopped.

Hereinafter, with reference to the drawings, the technical configuration of the present invention and its effects will be described in more detail through preferred embodiments.

1 is an installation state diagram showing a seismic device provided in the lower part of the power distribution enclosure 100 on the upper end of the seismic frame 10 provided with the seismic device, and the seismic wave transmitted from the ground surface or the floor of a building, etc. Absorbs and attenuates external shocks and vibrations of the device to prevent temporary shocks or continuous vibrations from being transmitted to the power distribution enclosure.

The seismic device is preferably formed in the same size or the same shape as the lower surface of the power distribution enclosure, and may be firmly coupled by means of fastening such as a morphological fitting coupling or bolts on which the bottom surface of the power distribution enclosure is seated.

2 is a plan view of the earthquake-resistant device, the fixing table 40 is disposed inside the earthquake-resistant frame 10, and a plurality of spring damper modules 50 are disposed between the fixing table and the earthquake-resistant frame. The spring damper module may be disposed in a diagonal direction at each corner of the earthquake-resistant frame, or alternatively, may be disposed symmetrically in the center of each side of the earthquake-resistant frame.

The structure of the earthquake-resistant frame corresponding to the basic body of the earthquake-resistant device is a rectangular frame with an empty interior as shown, and at least the lower part is open, preferably the upper and lower parts are open. It may be formed as a planar angular structure, such as an octagon, or a planarly curved structure, such as a circle or an oval. A ball transfer or an elastic member may be disposed at the square corner of the earthquake-resistant frame, and the fastening part 12 of the spring damper module may be mounted. When the earthquake-resistant frame is a rectangular or curved structure other than a rectangular structure, the arrangement position of the plurality of elastic members or the plurality of ball transfers may be determined to maintain the same distance from each other, and the spring damper module is also arranged symmetrically may vary.

The arrangement structure of the spring damper module is, for example, in the case of a rectangular earthquake-resistant frame, it may be arranged in a cross shape to be connected to the center of each inner surface of the frame, or a total of four modules may be connected to each corner of the earthquake-resistant frame. The hexagonal frame may have 3 or 6 modules, and the octagonal frame may have 4 or 6 modules. In addition, in the case of a circular frame, the required number of spring damper modules may be symmetrically disposed so that they have the same spacing.

FIG. 3 schematically shows the internal structure of the earthquake-resistant device of FIG. 2 . The fixing table 40 is disposed in the center of the earthquake-resistant frame, and may be fixed to the ground surface (G) or the floor surface of a building by a fixing means of an anchor bolt (60). A plurality of spring damper modules 50 connected to the fixture and the seismic frame are horizontally arranged at the same height.

A plurality of ball transfers 20 are fixed to the bottom of the earthquake-resistant frame 10 to ensure free movement with the bottom surface, and an elastic member 30 for absorbing vertical vibrations is disposed at the same position on the upper portion of the ball transfer. It is preferable that at least four ball transfers are arranged, and in the case of a prismatic frame structure, they are located at each corner, and in the case of a curved frame, they are preferably arranged so as to form the same distance from each other. In addition, as another embodiment of the present invention, when the ball transfer is arranged at the corner of the earthquake-resistant frame, the ball transfer may be additionally arranged at the center between each corner and the corner, if necessary. The elastic member 30 may be formed of an elastic material such as rubber or urethane, and if necessary, may be formed of a spring or a dual structure of rubber and spring.

A plurality of spring damper modules 50 symmetrically disposed between the earthquake-resistant frame and the fixture return the lower center of the earthquake-resistant frame and the switchboard disposed thereon to the original fixture center position after vibration due to an external force such as an earthquake stops. The spring damper module 50 is composed of a bracket 51 for connecting to the seismic frame and the fixture, respectively, an elastic body having a different elastic modulus, and a damper 55 for quickly alleviating the vibration shock applied to the elastic body. As the damper, a shock absorber that can absorb the contraction and relaxation of the elastic body and quickly buffer the vibration shock may be used.

4A is a view showing a spring damper module according to a first embodiment of the present invention, wherein a first spring 52 and a second spring 53 having different elastic modulus between the brackets at both ends are interposed between the insertion piece 54 The bushing 56 is inserted in each spring to serve as a movement guide during compression or tension while maintaining the center of the spring. Two pairs of first and second springs arranged in series are spaced apart from each other while maintaining a distance from each other, and a damper 55 is disposed in parallel with a bracket interposed therebetween.

When the spring damper module 50 describes the mechanism for suppressing horizontal vibration, the first spring 52 and the second spring 53 having different elastic modulus are connected in series through the insertion piece 54 . When an external force is applied to a weak vibration, a spring with a small elastic force acts on the weak vibration and a spring with a strong elastic force also acts on a strong vibration.

In the spring damper module, various modified examples can be applied to configuring the elastic body with different elastic modulus and arranging the damper.

For example, in the second embodiment of FIG. 5A , the elastic modulus is different by having a plurality of pitches in one elastic body 61 rather than a separate elastic body. In addition, as in the third embodiment of FIG. 6A , a helical elastic body 71 having a constant pitch but different outer diameters was applied. In this way, by changing the peak or outer diameter of the elastic body, it is possible to have the same effect as the series connection of the elastic body having a plurality of elastic modulus.

The damper 55 can prevent damage to the switchboard by effectively damping continuous shaking and bringing it to a stop state in a short time. As shown, the damper 55 is disposed in parallel with the elastic body, but may be configured to be inserted into the elastic body. In this case, the damper may serve not only to buffer the vibration impact of the elastic body, but also serve as a bushing for maintaining the center of the elastic body.

7 is a perspective view showing a detailed structure of the fixture 40, the fixture is fixed to the ground surface or the building floor to perform a centering function, and specifically, the fixture is a spring damper module formed by protruding vertically from the bottom plate and the bottom plate. of the fastening portions 42 are symmetrical to each other, and an anchor bolt fixing hole 41 is formed in the center of the bottom plate, so that the fixing base can be fixed to the ground surface or the floor surface of the building.

A plurality of spring damper modules connected to the fixture are basically responsible for maintaining equilibrium and restoring the earthquake-resistant frame to its original state after vibration when vibrations caused by external force occur, and additionally participate in absorbing up-and-down vibrations together with the elastic member. It can also be involved in horizontal vibration control and vertical vibration dispersion along with the ball transfer.

8 is a perspective view and a cross-sectional view of the ball transfer 20 responsible for the horizontal vibration dispersion function of the earthquake-resistant device, a ball insertion hole inside the body is provided, a main bearing ball 21 is inserted in the insertion hole, and additionally An auxiliary bearing ball 22 is further disposed inside the insertion hole to assist the free rotation of the bearing ball 21 .

Ball transfer, elastic member, spring damper module mounted or coupled to the seismic frame By such a configuration, the seismic frame is provided with horizontal and vertical fluidity while the central position is fixed, effectively distributing and reducing the force applied to the switchboard by external shocks or vibrations, thereby doubling the electrical and physical stability of the devices inside the switchboard. can do it

When vibration occurs on the ground surface or the floor surface of a building due to an earthquake or the like, a mechanism for protecting the switchgear by attenuating the vibration of the components will be described in more detail.

First, when horizontal vibration occurs on the ground surface or the building floor surface, the switchgear does not vibrate like the ground surface or the building floor surface by the ball rolling operation of the ball transfer 20 in direct contact with the floor surface. can keep Therefore, the horizontal vibration of the ground surface or the floor of the building cannot be transmitted to the switchboard. In this case, the spring damper module may serve to control and damp horizontal vibration together with the ball transfer.

When the horizontal vibration of the ground surface or the building floor stops, when the center of the fixture 40 fixed to the building floor and the center of the switchboard are in a state of misalignment, the vector sum of the elastic force is '0'. The tension of the spring damper module 50 is applied to return the center of the seismic frame to the center of the switchboard to the central position of the fixture.

When vertical vibration occurs on the ground surface or the floor surface of the building, the vibration of the ground surface or the floor surface of the building is mostly attenuated by the elastic force of the elastic member 30, so that the transmission of the external force to the switchgear is blocked. In this case, the spring damper module may also serve to control and damp vertical vibration together with the elastic member. With this shock absorption and control mechanism, three-dimensional vibration including vertical and horizontal vibrations caused by earthquakes, etc., can hardly be transmitted to the switchboard, and after the vibration stops, the switchboard moves to its original central position, thereby maintaining stability.

In particular, the seismic device of the present invention can quickly return to the original state from the vibration shock by the damper together with the elastic body of the spring damper module. 9 and 10 are schematic views showing the vibration damping mechanism of the spring damper module. Unlike the fixture that is fixed to the floor when an external force such as an earthquake is applied, the earthquake-resistant frame is connected to the spring damper module and deviated from its initial position and vibrates. (see 10a, 10b). When the movement (M1) of the elastic body of the spring damper module occurs due to the vibration shock, the damper acts in a direction to prevent the movement of the elastic body (M2). It is rapidly reduced and it is possible to return to the initial position.

As can be seen from the above-described embodiments and drawings, the seismic device for a switchgear of the present invention has a simple overall structure and can be modularized into one system, so that it is easy to manufacture and install and has excellent compatibility with various types of switchgear. In particular, in normal times when earthquakes do not occur, special management is not required, so maintenance costs are not incurred. In the event of an earthquake, it effectively absorbs or reduces seismic waves without deterioration in function to protect the switchgear from mechanical and electrical damage, resulting in durability and reliability of the switchgear. can greatly contribute to improvement.

In the above, the present invention has been exemplarily described through preferred embodiments, but the present invention is not limited to such specific embodiments, and various forms within the scope of the technical idea presented in the present invention, specifically, the claims. may be modified, changed, or improved.

G: ground surface or floor of building 100: power distribution enclosure
10: seismic frame 12: spring damper module fastening part
20: ball transfer 21: main bearing ball
22: auxiliary bearing ball 30: elastic member
40: fixing rod 41: anchor bolt fixing hole
42: spring damper module fastening part 50: spring damper module
51: bracket 52: first spring
53: second spring 54: insert piece
55: damper 56: bushing
60: anchor bolt 61: third elastic body
71: fourth elastic body

Claims (4)

An earthquake-resistant frame that is fixed or coupled to the lower part of the switchgear enclosure and whose interior is at least open downward;
A plurality of ball transfers coupled to the lower surface of the seismic frame and inserting bearing balls into the body to give horizontal fluidity to the seismic frame,
A plurality of elastic members coupled to the lower surface of the seismic frame to damp up and down vibrations generated on the ground surface or the floor surface of a building;
A fixture disposed in an open area inside the earthquake-resistant frame and fixed to the ground surface or the floor surface;
A plurality of spring damper modules for returning the earthquake-resistant frame to its initial position while attenuating horizontal vibrations when one end is coupled to the fixture, the other end is coupled to the inner surface of the earthquake-resistant frame, and the horizontal position of the earthquake-resistant frame is changed by an external force, and ,
The spring damper module includes a bracket for connecting to the seismic frame and the fixture, respectively, an elastic body, a damper for quickly alleviating the vibration shock applied to the elastic body, and a bushing inserted into the elastic body to support movement during compression or tension of the elastic body, , The elastic body is connected in series with an elastic body having a different elastic modulus to damp vibration shock in response to vibrations having different strengths, and the damper acts in a direction to prevent the movement of the elastic body when the elastic body vibrates by an external force. The elastic modulus is connected in parallel with another elastic body to cushion the vibration of the elastic body,
The elastic member and the ball transfer are disposed in the same position under the earthquake-resistant frame as a pair, and the elastic member is positioned between the lower surface of the earthquake-resistant frame and the ball transfer so that the ball transfer can roll on the floor surface. of the bearing ball is in direct contact with the floor surface,
A plurality of elastic members and ball transfer pairs are arranged at equal intervals on the lower surface of the earthquake-resistant frame, and a plurality of spring damper modules are arranged symmetrically on the inner surface of the earthquake-resistant frame and provide the same tension to each coupling portion of the earthquake-resistant frame. to do
Seismic device for switchgear.
According to claim 1,
The elastic body of the spring damper module is an earthquake-resistant device for a switchgear, characterized in that two elastic bodies having different elastic modulus are connected in series.
According to claim 1,
The seismic device for a switchgear, characterized in that the elastic body of the spring damper module is formed so that one elastic body has different pitches of elastic modulus.
According to claim 1,
The seismic device for a switchgear, characterized in that the elastic body of the spring damper module has a helical structure with a partially different outer diameter formed on one elastic body.

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