CN113089466A - Electric control friction damping seismic mitigation and isolation spherical support - Google Patents

Abstract

The invention discloses an electric control friction damping seismic isolation spherical support, which comprises: a lower support plate; an upper support plate; the friction assembly is supported on the lower support plate by the upper support plate and at least provided with a spherical friction interface, and a lubricant which is matched with all the friction interfaces of the friction assembly is a lubricant with an electric hysteresis effect; a vibration detection device; a controller; a main circuit, a power adjusting device arranged on the main circuit is connected with the controller to adjust the output power of the main circuit according to the vibration intensity, and the main circuit is connected to a friction member forming a friction interface; correspondingly, the back side of the friction member opposite to the friction interface is provided with an insulating layer or made of insulating materials, and if the friction member is made of insulating materials, the friction member is embedded with a conductive layer connected with the main circuit. The seismic intensity response method based on the invention has good seismic intensity response.

Description

Electric control friction damping seismic mitigation and isolation spherical support

Technical Field

The invention relates to a seismic isolation spherical support.

Background

The bridge bearing has various types, such as a spherical bearing, a plate type rubber bearing, a basin type rubber bearing and the like, and has two main functions, one is to effectively transmit bridge load (dynamic load and static load) to a pier, and the other is to overcome beam body bias generated by displacement of a beam body caused by the action of braking force, environmental temperature, concrete shrinkage or creep, load and the like. For example, in the transverse direction of the bridge body, if the side length of the beam body is long and the distance between the pillars is not changed due to the change of the environmental temperature, if the beam body and the pillars are rigidly connected, the rigidly connected part may be sheared or the beam body generates a large shearing force to the connected part. The bridge bearing enables the beam body to be pressed on the pier column as positive as possible.

Because the connecting structure between the bridge and the pier stud not only needs to face the displacement in the horizontal direction, but also can generate corner deformation due to vertical compression deformation or inconsistent deformation amplitude of different parts, the rolling ball type support which can adapt to moving deformation and rotating deformation is generated. The spherical support is the bridge support which is most widely applied at present, and can not only provide slippage, but also provide rotation, and can adapt to various changes of displacement between a beam body and a pier.

Chinese patent document CN203021916U discloses a spherical steel support, which belongs to a single spherical crown spherical support, and specifically comprises a base, a lower support plate arranged on the base and an upper support plate arranged on the lower support plate through a friction assembly, wherein the upper surface of the lower support plate is provided with a spherical groove, and a spherical crown plate is arranged in the spherical groove, and a polytetrafluoroethylene sliding plate is adapted to the spherical crown plate to improve the friction performance of the spherical friction pair. The friction performance of the spherical friction pair is related to the surface roughness and the material of the interface forming the friction pair, and although the friction performance is influenced by other factors, such as whether the friction interface has a lubricant or not, the field temperature and the like, the friction coefficient of the spherical friction pair is determined and unadjustable in terms of the friction responsiveness, so that the spherical friction pair does not have the responsiveness to various working conditions.

Chinese patent document CN101705722A discloses a hyperboloid shock-absorbing tensile support, which belongs to a modification of a spherical support, and has two curved surfaces, i.e. two spherical surfaces, wherein there is one spherical surface above and below a spherical cap lining plate, and the hyperboloid shock-absorbing support is arranged to improve the responsiveness of, for example, vibration. Compared with a spherical support with a single curved surface, the spherical support with the double curved surfaces is a more effective friction energy dissipation seismic mitigation and isolation device.

The working mode of the hyperboloid spherical seismic isolation bearing is as follows: under the action of common load, the hyperboloid spherical support is equivalent to a fixed support because relative sliding is not allowed under the action of the shearing resistant device arranged at the periphery of the spherical crown lining plate; under the action of earthquake load, the shearing resistant device is sheared, the support slides to enable the bridge deck to displace relative to the bridge pier, and the horizontal movement can generate vertical lifting of gravity, so that restoring force can be generated. The sliding of the support prolongs the basic period of the bridge structure, thereby achieving the purpose of shock insulation; the friction effect between the sliding spherical surfaces realizes energy consumption, thereby achieving the aim of shock absorption;

however, the hyperboloid spherical seismic isolation and reduction support still has engineering application limitation, because the friction coefficient and the curvature radius of the hyperboloid spherical seismic isolation and reduction support are constant values, the damping is unchanged, the hyperboloid spherical seismic isolation and reduction support cannot adapt to seismic input with different strengths, and the seismic isolation effect is influenced. If rare meets earthquake, because the damping is a fixed value, in order to dissipate overlarge earthquake energy, the support can increase the horizontal slippage, even exceed the designed effective sliding displacement of the support, so that the support is damaged. Once the friction support serving as an important node in the structure fails, a force transmission path of the structure is changed, so that the anti-seismic performance of other parts is adversely affected, and the earthquake damage of the structure is further aggravated.

Disclosure of Invention

The invention aims to provide an electronic control friction damping seismic isolation spherical support with good response to seismic intensity.

In an embodiment of the present invention, an electrically controlled friction damping seismic isolation ball bearing is provided, which includes:

a lower support plate;

the upper support plate is positioned right above the lower support plate;

the friction assembly is supported on the lower support plate by the upper support plate and at least provided with a spherical friction interface, and a lubricant which is matched with all the friction interfaces of the friction assembly is a lubricant with an electric hysteresis effect;

the vibration detection device is arranged on the lower support plate;

the controller is connected with the vibration detection device in an input mode so as to input vibration strength;

a main circuit, a power adjusting device arranged on the main circuit is connected with the controller to adjust the output power of the main circuit according to the vibration intensity, and the main circuit is connected to a friction member forming a friction interface; correspondingly, the back side of the friction member opposite to the friction interface is provided with an insulating layer or made of insulating materials, and if the friction member is made of insulating materials, the friction member is embedded with a conductive layer connected with the main circuit.

Optionally, the lower support plate has a lower ball socket and the upper support plate has an upper ball socket aligned with the lower ball socket;

accordingly, the friction assembly comprises:

the spherical cap liner plate is provided with an upper spherical surface matched with the upper ball socket to form an upper interface and a lower spherical surface matched with the lower ball socket to form a lower interface, so that a double-spherical friction interface is formed.

Optionally, the spherical friction interface is formed by a curved steel plate and a curved polytetrafluoroethylene plate which are ground oppositely;

wherein, the surface of the curved surface steel plate at least deviating from the spherical friction interface is provided with an insulating layer, and the curved surface polytetrafluoroethylene plate is embedded with a conductive layer.

Optionally, the surface of the curved teflon plate matched with the curved steel plate is provided with a groove to contain part of the lubricant.

Optionally, the direction of the grooves is perpendicular to the designed rotational direction of the ball-type friction interface.

Optionally, an upper curved steel plate fitted in an upper spherical friction interface of the upper ball socket is fixed in the upper ball socket;

a lower curved surface polytetrafluoroethylene plate which is adapted to a lower spherical friction interface of the lower ball socket is fixed in the lower ball socket;

correspondingly, an upper curved surface polytetrafluoroethylene plate in the upper spherical friction interface and a lower curved surface steel plate in the lower spherical friction interface are fixed on the spherical crown lining plate.

Optionally, a hole is formed in the spherical cap lining plate, and the main circuit is connected with a corresponding friction member arranged on the spherical cap lining plate through a cable penetrating through the hole;

the corresponding ball socket is provided with an annular electrode, and a friction member arranged at the ball socket is connected with the main circuit through the electrode, and correspondingly, the electrode and the ball socket are coaxial.

Optionally, a seal ring is provided around each friction interface.

Optionally, a shearing resisting device connected with the upper support plate and the lower support plate simultaneously is further arranged, and before the shearing resisting device is sheared, the seismic isolation reducing spherical support forms a fixed support;

correspondingly, the main circuit is provided with a switch circuit and a sensor for detecting whether the shearing resistant device is sheared or not, the sensor is connected with the controller, the controller is connected with the switch circuit in an output mode, so that the main circuit is in an open circuit state before the shearing resistant device is sheared, and the main circuit is closed when the shearing resistant device is sheared.

Optionally, a solar panel and a storage battery are further provided to supply power to the main circuit, the controller and components connected with the controller.

In the embodiment of the invention, the lubricant matched with the friction interface of the electric control friction damping seismic isolation spherical support friction assembly is the lubricant with the electric hysteresis effect, after the electric conduction, when the voltage loaded on the friction member changes, the viscosity of the lubricant changes, so that the friction coefficient of the friction interface changes, the friction interface adapts to different seismic intensity, when the seismic intensity is larger, the viscosity of the lubricant is increased, the bridge overturn is avoided, and when the seismic intensity is smaller, the viscosity of the lubricant is reduced, the stress borne by the upper support plate is reduced, so that the electric control friction damping seismic isolation spherical support friction assembly has better response to the earthquake.

Drawings

FIG. 1 is a schematic perspective view of an electrically controlled friction damping seismic isolation ball bearing in an embodiment.

FIG. 2 is a schematic main sectional view of an electrically controlled friction damping seismic isolation ball-type support in an embodiment.

Fig. 3 is an enlarged view of a portion a of fig. 2.

FIG. 4 is a schematic cross-sectional view of a lower curved PTFE sheet in one embodiment.

In the figure: 1. the solar cell module comprises a lower anchor bolt, 2 parts of a lower support plate, 3 parts of a screw, 4 parts of a lower shearing seat, 5 parts of a shearing bolt, 6 parts of an upper shearing seat, 7 parts of an upper anchor bolt, 8 parts of an upper support plate, 9 parts of a reinforcing plate, 10 parts of a friction assembly, 11 parts of a vibration sensor, 12 parts of a corrugated pipe, 13 parts of a control box, 14 parts of a battery compartment, 15 parts of a cantilever, 16 parts of a solar cell panel, 17 parts of a lower spherical crown seat, 18 parts of a lower curved polytetrafluoroethylene plate, 19 parts of a lower curved steel plate, 20 parts of an upper spherical crown seat, 21 parts of an upper sealing ring, 22 parts of an upper curved steel plate, 23 parts of an upper curved polytetrafluoroethylene plate, 24 parts of a ring electrode, 25 parts of a lower sealing ring, 26 parts of a cable, 27 parts of an electrode, 28 parts of a corrugated pipe joint, 29 parts of a groove.

Detailed Description

In embodiments of the present invention, the charge at the surface of the particles affects the viscosity of the fluid based on the electrohysteresis effect (electrohysteresis effect), according to the IUPAC definition. Refers to the phenomenon that the static viscosity coefficient of the liquid is increased due to the surface charge of solid particles in the liquid when no electric field is applied. The dynamic viscosity coefficient of the liquid is positively correlated with the applied electric field gradient, which is positively correlated with the voltage across the friction member that establishes the friction interface. In the embodiment of the invention, the friction coefficient of the friction interface is adjusted according to the vibration, so that the better adaptability is realized.

In addition, unless otherwise specified, for a bridge bearing, it has a definite upper and lower but basic frame of reference, thus corresponding for example to the lower bearing plate 2, the upper bearing plate 8 in the embodiment of the invention. For ball bearings in bridge bearings, which are provided with a spherical cap liner 30, the axis of the spherical cap liner 30 is perpendicular to the playing surface of, for example, the upper bearing plate 8 in the rest state, as shown in fig. 1 for the upper playing surface of the upper bearing plate 8.

It should be noted that the spherical bearing does not refer to a structure body containing a complete sphere, but is provided with the spherical cap liner plate 30, and the spherical cap liner plate 30 is a part of the sphere, so as to define the spherical bearing.

The spherical cap liner 30 may have one spherical cap surface or two spherical cap surfaces, and in embodiments of the present invention, both types of spherical cap liner 30 may be used.

As a basic configuration, the electrically controlled friction damping seismic isolation ball bearing comprises a lower bearing plate 2, an upper bearing plate 8, and a friction assembly installed between the upper bearing plate 8 and the lower bearing plate 2, wherein the upper bearing plate 8 is generally connected as, for example, a beam of a bridge, in a manner generally connected by upper anchors 7, the number of the upper anchors 7 is generally not less than four, but in most applications, the number of the upper anchors 7 is also generally four.

For the lower support plate 2, it is usually fixedly connected with the bridge pier in the same way as the upper support plate is connected with the bridge girder, and the connecting piece is the lower anchor bolt 1 shown in fig. 1.

Generally, the upper seat plate 8 is located right above the lower seat plate 2, and in the original state, the support center of gravity of the upper seat plate 8 and the support center of gravity of the lower seat plate 2 are on the same vertical line.

The friction assembly is also the inherent configuration of the bridge bearing, and the travel of the friction assembly determines the maximum amount of positional variation of the bridge bearing, for example, of the bridge due to various reasons, by which the upper bearing plate 8 is supported on the lower bearing plate 2.

As previously mentioned, the spherical cap liner 30 may have one spherical cap surface or two spherical cap surfaces, and thus the friction assembly has at least one spherical friction interface.

As an improvement to the prior art, the lubricant adapted to all friction interfaces of the friction assembly is a lubricant having an electric hysteresis effect, and when the electric field of the lubricant changes, the friction coefficient of the corresponding friction pair changes.

As for the lubricant, most of the lubricants are insulating materials except, for example, graphite in the solid lubricant, and it is obvious that the lubricant satisfying the embodiment of the present invention is grease or lubricating oil, and grease or lubricating oil having relatively good insulation should be used.

Further, in the embodiment of the present invention, a vibration detecting device is further provided, the vibration detecting device is mounted on the lower support plate 2, the vibration detecting device suitable for the present invention is mainly used for detecting an earthquake, and therefore, a seismic monitor is adapted, the seismic monitor is an instrument for directly measuring the intensity of the earthquake, or directly obtains the intensity of the earthquake when the earthquake occurs, and the intensity of the earthquake is gradually changed, so that the response speed of the present electronic equipment is usually in the order of ms, and even higher response speed can be fully satisfied.

Correspondingly, a controller is provided, and an input port of the controller is connected with the vibration detection device to input the vibration strength; the conventional seismic monitor is provided with a plurality of sensor channels, generally 4 or 6 channel sensors, can be increased to 12 channels, has relatively more output channels and systems, and can directly output seismic intensity so as to be matched with the preset seismic intensity, and the corresponding control quantity can be adjusted according to the matching.

Accordingly, a main circuit on which a power adjusting device is connected to the controller to adjust an output power of the main circuit according to the intensity of the vibration is configured, and the main circuit is connected to a friction member forming a friction interface to change an electric field of the friction interface.

Furthermore, the friction member has an insulating layer or material on the back side of the friction interface to isolate the friction member from the upper support plate 8 or the lower support plate 2, and if the friction member is an insulating material, such as a teflon plate, the friction member is embedded with a conductive layer 32 connected to the main circuit.

When the conductive layer 32 corresponding to the friction member is energized, the conductive layers of the two members corresponding to the friction member for determining the friction interface form an electrode plate, so that an electric field is formed between the two conductive layers, the electric field strength of the electric field is positively correlated with the voltage loaded on the electrode plate, and negatively correlated with the distance between the electrode plates. Accordingly, through the adjustment of the electric field intensity, the damping coefficient of the lubricant is changed, so that the friction coefficient of the friction pair is changed.

From the above, it can be understood that when the seismic intensity is strong, the friction coefficient of the friction pair needs to be increased to avoid the bridge from overturning, and correspondingly, when the seismic intensity is weak, the friction coefficient of the friction pair needs to be decreased to improve the responsiveness of the bridge bearing, or the electric field intensity loaded on the friction interface is positively correlated with the seismic intensity, and as mentioned above, the electric field intensity is directly determined by and positively correlated with the voltage loaded on the conductive layer 32 constituting the electrode plate, and thus, the seismic intensity is positively correlated with the voltage loaded on the conductive layer 32 in fig. 4, for example, by the main circuit. The corresponding relation control point is only one, and the realization is very simple.

In the preferred embodiment, a bridge bearing with two spherical caps is used, and the corresponding two spherical cap surfaces are provided by the same spherical cap liner plate 30, so that the height of the bridge bearing is greatly reduced, and the bridge bearing has better stability.

Specifically, the method comprises the following steps: the lower support plate 2 is provided with a lower ball socket, and the upper support plate 8 is provided with an upper ball socket which is aligned with the lower ball socket;

accordingly, in the configuration shown in fig. 2 and 3, the friction assembly comprises:

the spherical cap liner 30, which can be seen in fig. 2, has an upper spherical surface that mates with the upper ball socket to form an upper interface and a lower spherical surface that mates with the lower ball socket to form a lower interface, forming a double ball-type friction interface. As can be seen from fig. 2, the two spherical crown surfaces are opposite to each other, and the overall height of the two spherical crown surfaces is not large because the spherical center angle of the spherical crown is relatively small, and if the two spherical crown surfaces are arranged back to back, the overall height is relatively small, so that the overall height of the bridge bearing is reduced.

In the configurations shown in fig. 2 and 3, the spherical friction interface is formed by a curved steel plate and a curved teflon plate which are ground in opposite directions; accordingly, the upper spherical friction interface on the upper side is formed by the upper curved steel plate 22 and the upper curved teflon plate 23 which are ground, and the lower spherical friction interface on the lower side is formed by the lower curved steel plate 19 and the lower curved teflon plate 18 which are ground.

Correspondingly, the surface of the curved steel plate at least departing from the spherical friction interface is provided with an insulating layer, and the curved polytetrafluoroethylene plate is embedded with a conductive layer 32.

For example, as shown in fig. 2, the lower surface of the upper curved steel plate 22 is used to form a friction interface, the upper surface is fixedly connected to the upper ball socket, and the upper surface has an insulating layer to insulate the upper support plate 8.

The upper curved steel plate 22 may have an insulating layer on its lower surface, and the insulating layer may be formed of a sprayed teflon paint.

In a preferred embodiment, for example, the lower surface of the upper curved steel plate 22 is not insulated.

In the preferred embodiment, the mating surfaces of the curved ptfe sheet and the curved steel sheet are grooved 29 to receive a portion of the lubricant to ensure a relatively uniform distribution of the lubricant.

The grooves 29 are similar to oil cups and provide continuous lubrication.

Specifically, as shown in fig. 4, which is a cross-sectional view of a lower curved teflon plate, the upper surface of the lower curved teflon plate is provided with a groove 29, the upper surface of the lower curved teflon plate is matched with the lower curved steel plate 22, and a lubricant is contained in the groove 29, so that continuous lubrication can be obtained, the thickness of a lubricating film is kept relatively stable, and the influence on the adjustment of the friction coefficient is reduced.

Preferably, the direction of the grooves 29 is perpendicular to the designed rotational direction of the ball-type friction interface, as shown in FIG. 4, the corresponding frictional direction corresponds to the previously described designed rotational direction, as shown by the arc-shaped direction in FIG. 4, and the grooves 29 are perpendicular to the page.

The vertical here satisfies the vertical of the longitude and latitude, i.e., the design rotation direction is assumed to be the latitude direction, and the groove 29 is the longitude direction.

As for the movement form of the friction member constituting the friction interface, in the embodiment of the present invention, the movable portions of the two spherical friction interfaces are made of different materials, so as to obtain better controllability, specifically, the upper curved steel plate 22 fitted in the upper spherical friction interface of the upper ball socket is fixed in the upper ball socket;

a lower curved surface polytetrafluoroethylene plate 18 which is adapted to a lower spherical friction interface of the lower ball socket is fixed in the lower ball socket;

accordingly, the upper curved polytetrafluoroethylene plate 23 in the upper spherical friction interface and the lower curved steel plate 22 in the lower spherical friction interface are fixed on the spherical cap liner plate 30.

In order to facilitate connection and avoid breaking the cable in sliding, a pore is formed on the spherical cap lining plate 30, and the main circuit is connected with a corresponding friction member arranged on the spherical cap lining plate 30 by the cable penetrated through the pore;

the corresponding ball socket is provided with an annular electrode 27 to keep better contact, namely, the conducting layer 32 or the curved steel plate is prevented from being separated from the contact with the electrode when the movement of the spherical cap lining plate 30 is larger; the friction member mounted at the ball socket is connected to the main circuit by means of the electrode, which electrode 27 is accordingly coaxial with the ball socket.

In some embodiments, a seal ring, such as lower seal ring 25 and upper seal ring 21 shown in fig. 3, is provided around each friction interface.

The friction assembly is easy to damage when frequently operated, and the light-weight movement amount required to be balanced has little influence on the normal use of the bridge, therefore, in the embodiment of the invention, a shearing resisting device which is simultaneously connected with the upper support plate 8 and the lower support plate 2 is also arranged, and before the shearing resisting device is sheared, the shock absorption spherical support forms a fixed support and does not respond to the light-weight beam body change.

Correspondingly, the main circuit is provided with a switch circuit and a sensor for detecting whether the shearing resistant device is sheared or not, the sensor is connected with the controller, the controller is connected with the switch circuit in an output mode, so that the main circuit is in an open circuit state before the shearing resistant device is sheared, and the main circuit is closed when the shearing resistant device is sheared.

In view of the fact that, for example, a cable may be torn due to the high earthquake intensity during an earthquake, in the embodiment of the present invention, a solar panel 16 and a storage battery, such as a storage battery installed in the battery compartment 14, are further provided to improve the self-sustaining force for supplying power to the main circuit, the controller, and the components connected to the controller.

Claims (10)

1. The utility model provides an automatically controlled friction damping subtracts isolation ball-type support which characterized in that includes:

a lower support plate;

the upper support plate is positioned right above the lower support plate;

the friction assembly is supported on the lower support plate by the upper support plate and at least provided with a spherical friction interface, and a lubricant which is matched with all the friction interfaces of the friction assembly is a lubricant with an electric hysteresis effect;

the vibration detection device is arranged on the lower support plate;

the controller is connected with the vibration detection device in an input mode so as to input vibration strength;

a main circuit, a power adjusting device arranged on the main circuit is connected with the controller to adjust the output power of the main circuit according to the vibration intensity, and the main circuit is connected to a friction member forming a friction interface; correspondingly, the back side of the friction member opposite to the friction interface is provided with an insulating layer or made of insulating materials, and if the friction member is made of insulating materials, the friction member is embedded with a conductive layer connected with the main circuit.

2. The electrically controlled friction damping seismic isolation ball-type bearing according to claim 1, wherein the lower bearing plate has a lower ball socket, and the upper bearing plate has an upper ball socket aligned with the lower ball socket;

accordingly, the friction assembly comprises:

the spherical cap liner plate is provided with an upper spherical surface matched with the upper ball socket to form an upper interface and a lower spherical surface matched with the lower ball socket to form a lower interface, so that a double-spherical friction interface is formed.

3. The spherical support of the electric control friction damping seismic isolation and reduction as claimed in claim 2, wherein the spherical friction interface is formed by a curved steel plate and a curved polytetrafluoroethylene plate which are ground oppositely;

wherein, the surface of the curved surface steel plate at least deviating from the spherical friction interface is provided with an insulating layer, and the curved surface polytetrafluoroethylene plate is embedded with a conductive layer.

4. The spherical support of claim 3, wherein the surface of the curved polytetrafluoroethylene plate matched with the curved steel plate is provided with a groove for accommodating part of lubricant.

5. The electrically controlled friction damping seismic isolation ball bearing according to claim 4, wherein the direction of the grooves is perpendicular to the designed rotation direction of the ball-shaped friction interface.

6. The electric control friction damping seismic isolation spherical support according to claim 3, wherein an upper curved steel plate adapted to an upper spherical friction interface of an upper ball socket is fixed in the upper ball socket;

a lower curved surface polytetrafluoroethylene plate which is adapted to a lower spherical friction interface of the lower ball socket is fixed in the lower ball socket;

correspondingly, an upper curved surface polytetrafluoroethylene plate in the upper spherical friction interface and a lower curved surface steel plate in the lower spherical friction interface are fixed on the spherical crown lining plate.

7. The spherical support of electric control friction damping shock absorption and isolation according to any one of claims 3 to 6, wherein the spherical cap lining plate is provided with a pore passage, and the main circuit is connected with a corresponding friction member arranged on the spherical cap lining plate by a cable penetrating through the pore passage;

the corresponding ball socket is provided with an annular electrode, and a friction member arranged at the ball socket is connected with the main circuit through the electrode, and correspondingly, the electrode and the ball socket are coaxial.

8. The electrically controlled friction damping seismic isolation ball bearing of claim 1, wherein a sealing ring is disposed around each friction interface.

9. The electrically controlled friction damping seismic isolation spherical bearing according to claim 1, characterized in that a shear device is provided and connected with the upper bearing plate and the lower bearing plate at the same time, and before the shear device is cut, the seismic isolation spherical bearing forms a fixed bearing;

correspondingly, the main circuit is provided with a switch circuit and a sensor for detecting whether the shearing resistant device is sheared or not, the sensor is connected with the controller, the controller is connected with the switch circuit in an output mode, so that the main circuit is in an open circuit state before the shearing resistant device is sheared, and the main circuit is closed when the shearing resistant device is sheared.

10. The electrically controlled friction damping seismic isolation ball bearing according to claim 1, further equipped with a solar panel and a storage battery to supply power to the main circuit, the controller, and components connected to the controller.

Images