阅读说明：本技术 一种倾覆型水平向隔震触发器 (Overturning type horizontal shock-insulation trigger ) 是由 纪金豹 张伟祺 胡宗祥 杨森 于 2021-06-10 设计创作，主要内容包括：一种倾覆型水平向隔震触发器,属于减振控制领域,包括支腿、质量块、万向球、锁舌、弹簧、限位筒、复位支腿、复位开关等,触发器布置在隔震装置的两板之间。解锁的条件为通过质量块通过感知地面加速度产生水平向运动,质量块在运动过程中会对支腿施加力矩作用,超过支腿的抗倾覆力矩时,支腿倾覆倒下,锁舌在自身重力及弹簧压力作用下从锁孔中抽出,触发器解锁,隔震装置启动。地震结束后,通过按压复位开关,使复位支腿由四周向中心聚拢,推动质量块回归正常使用状态下的位置,同时质量块可带动支腿与锁舌回归初始状态。本发明在地震加速度峰值大于触发限值时触发器自动解锁,减小设备的地震响应；地震作用结束后可手动复位,满足多次使用需求。(The utility model provides an overturning type level is to shock insulation trigger, belongs to the damping control field, including landing leg, quality piece, universal ball, spring bolt, spring, a spacing section of thick bamboo, landing leg that resets, reset switch etc. the trigger is arranged between two boards of shock insulation device. The condition of unblock is through perception ground acceleration production level to the motion through the quality piece, and the quality piece can exert moment effect to the landing leg in the motion process, and when exceeding the antidumping moment of landing leg, the landing leg topples down, and the spring bolt is taken out from the lockhole under self gravity and spring pressure effect, and the trigger unblock, shock isolation device start. After the earthquake is finished, the reset switch is pressed, so that the reset supporting legs are gathered from the periphery to the center, the mass block is pushed to return to the position in the normal use state, and meanwhile, the mass block can drive the supporting legs and the lock tongues to return to the initial state. When the earthquake acceleration peak value is larger than the trigger limit value, the trigger is automatically unlocked, so that the earthquake response of the equipment is reduced; after the earthquake action is finished, the earthquake alarm can be manually reset, and the requirement of multiple use is met.)

1. The utility model provides an overturning type horizontal shock insulation trigger which characterized in that: the shock isolation device comprises supporting legs (1), a mass block (2), a universal ball (3), a bolt (4), a spring (5), a limiting cylinder (6), a lock hole (7), a reset supporting leg (8), a reset switch (9), a shell (10), a shock isolation device upper plate (11) and a shock isolation device lower plate (12); the connection mode is as follows: both ends of the supporting leg (1) are hemispherical, ball sockets with the radiuses smaller than that of the hemispheres of the supporting leg (1) are arranged on the bottom surface of the mass block (2) and the upper surface of the lower plate of the shell (10), the upper hemispheres and the lower hemispheres of the supporting leg (1) can slide in the ball sockets, and the hemispheres at both ends of the supporting leg (1) cannot be separated from the ball sockets in the movement process; the mass block (2) is in rolling contact with the universal ball (3), the upper surface of the universal ball (3) is in bolt connection with the bolt (4), the bolt (4) is connected with the shell (10) through the spring (5), and the limiting cylinder (6) can limit the bolt (4) to move only in the vertical direction; holes are formed in the center and the four corners of the upper plate of the shell (10), the bolt (4) penetrates through the center to form the hole, and the reset switch (9) penetrates through the four corners to form the hole; the middle part of the reset supporting leg (8) is provided with a spherical hinge which can rotate; the two ends of the reset supporting leg (8) are hemispheric, the lower surface of the reset switch (9) and the upper surface of the lower plate of the shell (10) are provided with ball sockets, the upper hemisphere and the lower hemisphere of the reset supporting leg (8) can roll in the ball sockets, and the hemispheres at the two ends of the reset supporting leg (8) cannot be separated from the ball sockets in the movement process.

2. The overturning type horizontal seismic isolation trigger according to claim 1, which is unlocked in a manner that: when an earthquake occurs, the triggering device senses the ground acceleration through the mass block (2) to force the mass block (2) to move horizontally, the mass block (2) can exert a moment effect on the supporting leg (1) in the moving process, the moment is the overturning moment of the supporting leg, when the overturning moment exceeds the overturning moment of the supporting leg (1), the supporting leg (1) overturns, the bolt (4) is drawn out from the lock hole (7) under the action of self gravity and spring pressure, and the triggering device unlocks.

3. The overturning type horizontal seismic isolation trigger according to claim 1, wherein the trigger unlocking method is determined by the following steps:

analyzing the dynamic response of a structure under the action of an earthquake by using a vibration table test or a numerical simulation method to obtain the earthquake response acceleration a when the trigger is automatically unlocked;

step two, calculating the anti-overturning moment M of the supporting leg when the supporting leg shakes with the bottom edge as a pivot under the action of the earthquake₁；M₁Resulting from the weight of the leg and the total weight force pressing on the leg, including: mass m of single leg₁Mass m of mass₂Total mass of balls m₃Mass m of lock tongue₄Then, thenWherein M is₁Mu is the friction coefficient of the contact surface between the upper and lower hemispheres of the supporting leg (1) and the ball socket, g is the gravity acceleration, k is the elastic coefficient of the spring (5), and l is the anti-overturning moment of a single supporting leg₀Is the original length of the spring (6) |₁Length of spring (6) when the trigger is locked, h₂Is the height of the mass block;

step three, calculating the overturning moment M of the supporting leg when the supporting leg shakes under the action of the earthquake₂；M₂Generated by horizontal shaking of the mass block, with the height of the mass block being h₂The moment generated by the mass block isWherein M is₂The moment of overturning of a single supporting leg is shown, and a is the floor earthquake response acceleration of the building when the trigger is automatically unlocked;

step four, when M is satisfied₂>M₁Support legWhen the lock is overturned, the lock tongue is drawn out of the lock cylinder, so that the unlocking function of the trigger is realized; if M is not satisfied₂>M₁Then, the design parameters are corrected through one of the following measures;

first, by adjusting the pressure of the spring, M is changed₁The size of (d);

secondly, M is changed by adjusting the friction coefficient between the supporting legs and the ball sockets between the mass block and the shell₁The size of (d);

thirdly, M is changed by adjusting the mass and shape of the mass (2)₂The size of (2).

4. An overturning type horizontal seismic isolation trigger according to claim 1, wherein: under normal conditions, the spring (5) is in a compressed state, the support leg (1) is kept in an upright state by the mass block (2) above the support leg (1), the universal ball (3), the gravity of the bolt (4) and the downward elastic force of the spring (5), and the trigger is in a locked state.

5. An overturning type horizontal seismic isolation trigger according to claim 1, wherein: when the trigger is subjected to the action of an earthquake with the acceleration smaller than the triggering acceleration, the landing leg (1) does not move because the anti-overturning moment is larger than the overturning moment, the mass block (2) does not move horizontally, and the trigger is still in a locking state.

6. An overturning type horizontal seismic isolation trigger according to claim 1, wherein: when the trigger is subjected to the action of an earthquake larger than the triggering acceleration, the mass block (2) in the trigger senses the ground acceleration to generate horizontal movement, and the horizontal movement can exert the action of overturning moment on the supporting leg (1); in the vertical direction, the mass block (2), the universal ball (3), the spring bolt (4) gravity and the pressure of the spring (5) can enable the supporting leg (1) to generate an anti-overturning moment, when the overturning moment is larger than the anti-overturning moment, the supporting leg (1) overturns and falls down, the spring bolt (4) generates vertical motion to be drawn out from the lock hole (7), and the trigger is in an unlocking state.

7. The overturning type horizontal seismic isolation trigger according to claim 1, wherein the resetting process comprises the following steps: the trigger is in the unblock state, landing leg (1) has toppled this moment, after the earthquake effect, the bolt on reset switch (9) is pressed to the accessible, make 8 landing legs (8) that reset gather together to the center by all around, promote quality piece (2) and return the position under the normal use condition, quality piece (2) can drive landing leg (1) become upright by toppling simultaneously, promote universal ball (3), spring bolt (4) upward movement, the lockhole is inserted in spring bolt (4), spring (5) pressurized produces pressure, landing leg (1) are erect balanced, realize the reset function.

The technical field is as follows:

the invention relates to an overturning type horizontal shock isolator trigger, which is used for an acceleration trigger unlocking function of a shock isolation device and belongs to the field of engineering structure vibration reduction control.

Background art:

the shock insulation device for equipment cannot achieve the expected target well in the shock insulation effect if the rigidity is large, and can damage the equipment under the action of non-seismic loads (wind loads of electric power facilities, artificial pushing and collision of cultural relic showcases and the like) if the rigidity is small. Therefore, the seismic isolation device for equipment needs to have higher rigidity in a normal use state so as to avoid harmful vibration of the seismic isolation system triggered by environmental excitation under a normal use condition; when the earthquake action less than the triggering acceleration is borne by the earthquake-isolated structure, the earthquake-isolating device is in a locking state so as to restrict the movement of the earthquake-isolated structure; when the earthquake action reaches the triggering acceleration, the trigger is unlocked, and the shock isolation device plays a role; after the earthquake is over, the locking trigger is simply reset to restore the locking state of the vibration isolation device.

The patent of application number CN201611104437.5 discloses an inertia force type locking and unlocking method of a shock isolation device in the technical field of anti-vibration protection of display cabinets and cultural relics. This patent recognises the necessity for inertial force triggering, however the solution it provides has significant drawbacks and in fact it is difficult to effectively trigger unlocking.

The patent of application number CN201611202163.3 discloses a scheme that is used for locking, unlocking and resetting a cultural relic vibration isolation device and has a very complicated structure, mainly a floating mass block is used for sensing ground acceleration, and unlocking and resetting functions are realized through a series of parts such as a string, a pulley block and a balance knife edge type trigger lever.

The patent of application number CN201810027052.6 discloses an adjustable locking device and an unlocking improvement method for a shock isolation device in the technical field of anti-vibration protection of display cabinets and cultural relics. The principle is that the unlocking is realized by utilizing the overturning triggering of the inertia block, the unlocking mode is improved, and the technical reliability is doubtful.

The patent of application number CN201810997820.0 realizes the seismic isolation locking function by arranging the staggered locking connection energy consumption steel plates between two staggered locking energy consumption steel plates, but the triggering unlocking function of itself is difficult to realize.

Patent application No. CN201910161238.5 proposes a locking solution for permanent magnet mass, whose validity has yet to be verified.

Based on the prior art, the mode that the mass block senses the earthquake acceleration is used for unlocking, and the vibration isolation trigger has the following characteristics: (1) the locking device cannot be triggered when the shock insulation structure is stressed, so that the shock insulation device is ensured to be in a locking state under the normal use condition; (2) the trigger senses the ground acceleration through the mass block and has a trigger limit value, when the ground input acceleration is smaller than the trigger limit value, the trigger is in a locking state, and the rigidity of the shock insulation layer is higher; when the ground input acceleration is larger than the trigger limit value, the trigger is in an unlocking state, and the rigidity of the shock insulation layer is smaller; (3) the structure is purely mechanical, power supply is not needed, and electronic components are not used; (4) the device has a reset function, and can quickly restore the locking state through simple arrangement after the shock isolation device is released; (5) the volume is small, and the shock isolation device can be installed inside or around the shock isolation device.

The invention content is as follows:

the invention relates to an overturning type horizontal shock insulation trigger, which mainly solves the technical problem of horizontal rigidity switching of a shock insulation device in locking and unlocking states, so that a shock insulation layer has higher rigidity in a non-earthquake state and when subjected to earthquake action smaller than triggering acceleration, and has lower rigidity when subjected to earthquake action larger than the triggering acceleration, and the aims of reducing harmful vibration and earthquake response of equipment are fulfilled.

In order to achieve the purpose, the design scheme of the invention is as follows:

when an earthquake occurs, the trigger senses the ground acceleration through the mass block 2 to force the mass block 2 to move horizontally, the mass block 2 can exert a moment effect on the supporting leg 1 in the moving process, when the overturning moment exceeds the anti-overturning moment of the supporting leg 1, the supporting leg 1 overturns, the spring bolt 4 is pulled out of the locking hole 7 under the action of self gravity and spring pressure, the trigger is unlocked, the shock isolation device works, and the earthquake response of the structure is reduced.

The overturning type horizontal shock isolation trigger is characterized in that the overturning moment and the anti-overturning moment of the supporting leg (1) are generated under the following conditions: the mass block (2) can exert moment action on the supporting leg (1) in the horizontal movement process, and the moment is the overturning moment of the supporting leg; the support leg (1) is pressed by the mass block (2) above the support leg (1), the universal ball (3), the gravity of the lock tongue (4) and the downward elastic force of the spring (5), so that the support leg (1) is kept in an unrestrained state, and the forces act on the support leg (1) to resist overturning and serve as an overturning moment.

The overturning type horizontal shock-insulation trigger is characterized in that the resetting process comprises the following steps: the trigger is in the unblock state, landing leg (1) has toppled this moment, after the earthquake effect, reset switch (9) are pressed to the accessible, make 8 landing legs (8) that reset gather together to the center by all around, promote quality piece (2) and return the position under the normal use state, quality piece (2) can drive landing leg (1) become upright by toppling simultaneously, promote universal ball (3), spring bolt (4) upward movement, spring bolt (4) reinsertion lockhole, spring (5) pressurized production pressure simultaneously, make landing leg (1) obtain the antidumping moment, realize reset function.

The unlocking method of the overturning type horizontal shock-insulation trigger can be determined according to the following steps:

selecting and optimizing a triggering acceleration a of a shock isolation device by using a vibration table test or numerical simulation method, namely a floor earthquake response acceleration a of a building when a shock isolation trigger is automatically unlocked;

step two, calculating the anti-overturning moment M of the supporting leg when the supporting leg shakes with the bottom edge as a pivot under the action of the earthquake₁；M₁Resulting from the weight of the leg and the total weight force pressing on the leg, including: mass m of single leg₁Mass m of mass₂Total mass of balls m₃Mass m of lock tongue₄Then, thenWherein M is₁Mu is the friction coefficient of the contact surface between the upper and lower hemispheres of the supporting leg (1) and the ball socket, g is the gravity acceleration, k is the elastic coefficient of the spring (5), and l is the anti-overturning moment of a single supporting leg₀Is the original length of the spring (6) |₁Length of spring (6) when the trigger is locked, h₂Is the height of the mass.

Step three, calculating the overturning moment M of the supporting leg when the supporting leg shakes under the action of the earthquake₂；M₂Generated by horizontal shaking of the mass block, with the height of the mass block being h₂Then, thenThe moment generated by the mass block isWherein M is₂And a is the floor earthquake response acceleration of the building when the trigger is automatically unlocked.

Step four, when M is satisfied₂>M₁When the support legs overturn, the lock tongue is drawn out of the lock cylinder, and the unlocking function of the trigger is realized. If M is not satisfied₂>M₁The design parameters are modified by the following measures.

First, by adjusting the pressure of the spring, M is changed₁The size of (2).

Secondly, M is changed by adjusting the friction coefficient between the supporting legs and the ball sockets between the mass block and the shell₁The size of (2).

Thirdly, M is changed by adjusting the mass and shape of the mass (2)₂The size of (2).

A toppling type level to shock insulation trigger, landing leg (1) and top quality piece (2), the connected form of below shell (10) lie in: both ends of the supporting leg (1) are hemispheres, ball sockets with the radiuses smaller than that of the supporting leg (1) are arranged on the lower surface of the mass block (2) and the upper surface of the lower plate of the shell (10), the hemispheres at both ends of the supporting leg (1) realize overturning when sliding in the ball sockets, and the hemispheres at both ends of the supporting leg (1) cannot be separated from the ball sockets in the movement process.

When the mass block (2) of the overturning type horizontal shock isolation trigger moves horizontally, the mass block (2) is in rolling contact with the universal ball (3), and the friction force is rolling friction force.

An overturning type horizontal shock isolation trigger is characterized in that after an overturning moment exceeds an anti-overturning moment, a mass block (2) drives a supporting leg (1) to overturn, at the moment, the gravity center position of the supporting leg (1) changes, and the overturning displacement of the supporting leg (1) can be further enlarged under the action of the gravity of an upper mass block (2), a universal ball (3) and a lock tongue (4) and the pressure of a spring (5), so that under the comprehensive action of the horizontal motion of the mass block (2), the gravity of an upper part and the pressure of the spring, the supporting leg (1) must overturn after the overturning moment exceeds the anti-overturning moment.

A type of toppling level to shock insulation trigger, universal ball (3) and spring bolt (4) are vertical to link to each other, and spring bolt (4) are vertical to link to each other through spring (5) and shell (10), have a spacing section of thick bamboo (6) in the outside of universal ball (3), spring bolt (4), vertical motion can only take place in spacing section of thick bamboo (6) restriction universal ball (3), spring bolt (4), prevents that universal ball (3), spring bolt (4) from taking place horizontal motion.

The overturning type horizontal shock isolation trigger comprises supporting legs (1), mass blocks (2), universal balls (3), lock tongues (4), springs (5), limiting cylinders (6), lock holes (7), reset supporting legs (8), reset switches (9), a shell (10), a shock isolation device upper plate (11) and a shock isolation device lower plate (12). The connection mode is as follows: both ends of the supporting leg (1) are hemispherical, ball sockets with the radiuses smaller than that of the hemispheres of the supporting leg (1) are arranged on the bottom surface of the mass block (2) and the upper surface of the lower plate of the shell (10), the upper hemispheres and the lower hemispheres of the supporting leg (1) can slide in the ball sockets, and the hemispheres at both ends of the supporting leg (1) cannot be separated from the ball sockets in the movement process; the mass block (2) is in rolling connection with the universal ball (3), the upper surface of the universal ball (3) is in bolt connection with the lower surface of the bolt (4), the bolt (4) is connected with the shell (10) through the spring (5), and the limiting cylinder (6) can limit the universal ball (3) and the bolt (4) to move only in the vertical direction; holes are formed in the center and the periphery of the upper plate of the shell (10), the radius of the central hole is larger than that of the lock tongue, and the radius of the peripheral holes is larger than that of the reset supporting leg (8); the middle part of the reset supporting leg (8) is provided with a spherical hinge which can rotate; the two ends of the reset supporting leg (8) are hemispheric, the lower surface of the reset switch (9) and the ball socket on the upper surface of the lower plate of the shell (10) are provided with a ball socket, the upper hemisphere and the lower hemisphere of the reset supporting leg (8) can roll in the ball socket, and the hemispheres at the two ends of the reset supporting leg (8) cannot be separated from the ball socket in the movement process.

The overturning type horizontal shock-insulation trigger is characterized in that: under the condition of no stress, the spring (5) is in a pressed state, the mass block (2) above the supporting leg (1), the universal ball (3), the gravity of the lock tongue (4) and the downward elastic force of the spring (5) can press the supporting leg (1), so that the supporting leg (1) is kept in an upright state, and the trigger is in a locked state at the moment.

The overturning type horizontal shock-insulation trigger is characterized in that: when the trigger is subjected to the action of an earthquake with the acceleration smaller than the triggering acceleration, the landing leg (1) does not move because the anti-overturning moment is larger than the overturning moment, the mass block (2) does not move horizontally, and the trigger is still in a locking state.

The overturning type horizontal shock-insulation trigger is characterized in that: a bottom plate of a shell (10) is connected with a lower plate (12) of the shock isolation device through bolts, a lock hole (7) is connected with an upper plate (11) of the shock isolation device through bolts, the shell (10) is connected with a lock tongue (4) through two springs (5), and the support leg (1) is pressed and limited to move by the gravity of a mass block (2), a universal ball (3) and the lock tongue (4) and the pressure of the springs (5).

The overturning type horizontal shock-insulation trigger is characterized in that: when the trigger is subjected to the action of an earthquake larger than the triggering acceleration, the mass block (2) in the trigger senses the ground acceleration to generate horizontal movement, and the horizontal movement can exert the action of overturning moment on the supporting leg (1); in the vertical direction, the weight of the mass block (2), the universal ball (3), the spring bolt (4) and the pressure of the spring (5) enable the supporting leg (1) to generate an anti-overturning moment, when the overturning moment is larger than the anti-overturning moment, the supporting leg (1) overturns and falls down, the spring bolt (4) is drawn out from the lock hole (7), and the trigger is unlocked.

Description of the drawings:

FIG. 1 is a three-dimensional view of an overturning type horizontal seismic isolation trigger mounted on a seismic isolation device

FIG. 2a is a plan view of an overturning type horizontal seismic isolation trigger in a locked state

FIG. 2b is a cross-sectional view of an overturning type horizontal shock-isolating trigger A-A

FIG. 3 is a plan view of the contact surface between the mass block and the universal ball of the overturning type horizontal vibration isolating trigger

FIG. 4 is a plan view of a leg of an overturning type horizontal seismic isolation trigger

FIG. 5 is a plan view of the bottom of a mass of an overturning type horizontal seismic isolation trigger

FIG. 6 is a plan view of the upper plate of the housing of an overturning type horizontal seismic isolation trigger

FIG. 7 is a plan view of the lower plate of the housing of an overturning type horizontal seismic isolation trigger

FIG. 8 is a bottom plan view of a reset switch of an overturning type horizontal seismic isolation trigger

FIG. 9 is a plan view of a reset leg of an overturning type horizontal seismic isolation trigger

In the figure: the shock isolation device comprises supporting legs (1), a mass block (2), universal balls (3), a bolt (4), a spring (5), a limiting cylinder (6), a lock hole (7), reset supporting legs (8), a reset switch (9), a shell (10), a shock isolation device upper plate (11) and a shock isolation device lower plate (12).

The specific implementation mode is as follows:

the invention is further described with reference to the following figures and detailed description.

Fig. 1 is an effect diagram of the trigger mounted between an upper plate (11) and a lower plate (12) of the seismic isolation device, and the locking and unlocking of the seismic isolation device in any horizontal direction can be realized.

Fig. 2 is a plan view of the trigger in a locked state, and is composed of a support leg 1, a mass block 2, a universal ball 3, a lock tongue 4, a spring 5, a limit cylinder 6, a lock hole 7, a reset support leg 8, a reset switch 9 and a housing 10, and the connection mode is as follows: both ends of the supporting leg 1 are hemispherical, ball sockets with the radiuses smaller than that of the hemisphere of the supporting leg 1 are arranged on the bottom surface of the mass block 2 and the upper surface of the lower plate of the shell 10, the upper hemisphere and the lower hemisphere of the supporting leg 1 can slide in the ball sockets, and the hemispheres at both ends of the supporting leg 1 cannot be separated from the ball sockets in the movement process; the mass block 2 is in rolling connection with the universal ball 3, the upper surface of the universal ball 3 is in bolted connection with the lower surface of the bolt 4, the bolt 4 is connected with the shell 10 through the spring 5, and the limiting cylinder 6 can limit the universal ball 3 and the bolt 4 to move only in the vertical direction; the upper plate of the shell 10 is provided with holes in the center and the periphery, the radius of the center hole is larger than that of the lock tongue, and the radius of the periphery holes is larger than that of the reset supporting leg 8; the middle part of the reset supporting leg 8 is provided with a spherical hinge which can rotate; the two ends of the reset supporting leg 8 are hemispheric, the lower surface of the reset switch 9 and the upper surface of the lower plate of the shell 10 are provided with ball sockets with the radiuses smaller than that of the hemispheres of the reset supporting leg 8, the upper hemisphere and the lower hemisphere of the reset supporting leg 8 can slide in the ball sockets, and the hemispheres at the two ends of the reset supporting leg 8 cannot be separated from the ball sockets in the movement process.

A-A is a cross section of an overturning type horizontal shock-insulation trigger A-A, the cutting part is the vertical direction of the middle part of the trigger, and a limiting cylinder 6 limits the movement directions of the universal ball 3 and the bolt 4 to be only the vertical direction.

Fig. 4 is a plan view of the contact surface form of the mass block and the universal ball, and the contact surface form of the rolling contact between the mass block 2 and the universal ball 3.

The bottom plate of the shell 10 is connected with the lower plate 12 of the shock isolation device through bolts, the lock hole 7 is connected with the upper plate 11 of the shock isolation device through bolts, the shell 10 is connected with the lock tongue 4 through the two springs 5, and the support leg 1 is pressed and limited to move by the gravity of the mass block 2, the universal ball 3 and the lock tongue 4 and the pressure of the springs 5.

When an earthquake occurs, the locking device senses the ground acceleration through the mass block 2 to force the mass block 2 to move horizontally, the mass block 2 can exert a moment effect on the supporting leg 1 in the moving process, when the overturning moment exceeds the anti-overturning moment of the supporting leg 1, the supporting leg 1 overturns and falls down, the bolt 4 is drawn out from the lock hole 7 under the action of self gravity and spring pressure, and the trigger unlocks.

After the overturning moment exceeds the anti-overturning moment, the mass block 2 drives the supporting leg 1 to overturn, at the moment, because the gravity center position of the supporting leg 1 is changed, the overturning displacement of the supporting leg 1 can be further enlarged under the actions of the gravity of the upper mass block 2, the universal ball 3 and the lock tongue 4 and the pressure of the spring 5, and therefore, under the comprehensive action of the horizontal motion of the mass block 2, the gravity of upper parts and the pressure of the spring, the supporting leg 1 is surely overturned to trigger unlocking after the overturning moment exceeds the anti-overturning moment.

The connection form of the supporting legs 1, the upper mass block 2 and the lower shell 10 is as follows: both ends of the supporting leg 1 are hemispheric, ball sockets with the radiuses smaller than that of the supporting leg 1 are arranged on the lower surface of the mass block 2 and the upper surface of the lower plate of the shell 10, the hemispheres at both ends of the supporting leg 1 realize overturning when sliding in the ball sockets, and the hemispheres at both ends of the supporting leg 1 cannot be separated from the ball sockets in the movement process.

Under the condition of no stress, the spring 5 is in a compressed state, the mass block 2 above the supporting leg 1, the universal ball 3, the gravity of the bolt 4 and the downward elastic force of the spring 5 can press the supporting leg 1, so that the supporting leg 1 is kept in an untilted state, and the trigger is in a locked state at the moment.

When the trigger is subjected to the action of an earthquake with the acceleration smaller than the triggering acceleration, the landing leg 1 does not move because the anti-overturning moment is larger than the overturning moment, the mass block 2 does not horizontally move, and the trigger is still in a locking state.

When the trigger is subjected to the action of an earthquake larger than the triggering acceleration, the mass block 2 in the trigger senses the ground acceleration to generate horizontal movement, and the horizontal movement can exert the action of overturning moment on the supporting leg 1; in the vertical direction, the mass block 2, the universal ball 3, the gravity of the bolt 4 and the pressure of the spring 5 can enable the supporting leg 1 to generate an anti-overturning moment, when the overturning moment is larger than the anti-overturning moment, the supporting leg 1 overturns and falls down, the bolt 4 is drawn out from the lock hole 7, and the trigger is unlocked.