CN111609080A - Suspension shock insulation method - Google Patents
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- CN111609080A CN111609080A CN201910132484.8A CN201910132484A CN111609080A CN 111609080 A CN111609080 A CN 111609080A CN 201910132484 A CN201910132484 A CN 201910132484A CN 111609080 A CN111609080 A CN 111609080A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
Abstract
The invention relates to a suspension shock insulation method, belongs to the field of shock absorption and isolation, and solves the technical problem that the existing shock insulation device is difficult to realize shock insulation in both the horizontal plane and the vertical direction. The method comprises the following steps: determining the horizontal shock isolation period and the vertical shock isolation period of a target object to be subjected to shock isolation and the sectional shape and size of a columnar mounting frame; determining the length of the swinging rod according to the horizontal shock insulation period; determining the number of the swing rods according to the bearing capacity of the swing rods; determining the number of the shock insulation springs according to the bearing capacity and the vertical shock insulation period of the shock insulation springs; building a suspension shock isolation device; and connecting the vibration isolation device with the target object to be isolated. The suspension shock insulation method can conveniently adjust the horizontal shock insulation period and the vertical shock insulation period, can realize a large horizontal shock insulation period by adjusting the length of the oscillating bar, realizes a good horizontal shock insulation effect, and has the characteristics of large shock insulation period, low manufacturing cost, excellent weather resistance, simple structure, safety, reliability and the like.
Description
Technical Field
The invention relates to the technical field of seismic isolation and reduction, in particular to a suspension seismic isolation method.
Background
Earthquake disasters bring immeasurable life and property losses to human beings, and a shock insulation system shows better shock resistance than the traditional shock insulation in earthquakes and is widely used at present. In addition, some precise experimental instruments, equipment and the like are affected by vibration, so that the measurement result is inaccurate. Shock insulation is essential for fragile and fragile goods, since the goods may be damaged by the shock during transportation, resulting in an immeasurable loss. The prior widely used rubber shock insulation support has great difficulty in producing qualified rubber shock insulation support with low level rigidity according to the prior art conditions. And the vertical earthquake action cannot be reduced or even amplified by the overlarge vertical rigidity of the rubber. And for some special structures, a large vibration isolation period is often needed. For a shock insulation system, vertical shock loads such as vertical earthquake action, explosion and the like have great influence on the safety of the structure.
Disclosure of Invention
In view of the above analysis, the present invention aims to provide a suspension seismic isolation method, which is used to solve the problem that the existing seismic isolation device is difficult to achieve both horizontal and vertical seismic isolation.
The purpose of the invention is mainly realized by the following technical scheme:
in the technical scheme of the invention, the suspension shock insulation method comprises the following steps:
s1, determining the horizontal shock isolation period and the vertical shock isolation period of the target object to be subjected to shock isolation and the sectional shape and size of the columnar mounting rack;
s2, determining the length of the swinging rod according to the horizontal shock isolation period;
s3, determining the number of the swing rods according to the bearing capacity of the swing rods;
s4, determining the number of shock isolation springs according to the bearing capacity and the vertical shock isolation period of the shock isolation springs;
s5, building a suspension shock isolation device;
and S6, connecting the vibration isolation device with the object to be isolated.
In the technical scheme of the invention, the suspension shock isolation device comprises: the device comprises a mounting frame, a suspension structure, a swing rod and a hanging basket;
the mounting rack is a frame with a circular or regular polygon section; the suspension structure can perform shock insulation in the vertical direction and is fixedly connected with the mounting frame; one end of the swing rod is connected with the suspension structure, and the other end of the swing rod is connected with the hanging basket; the hanging basket is used for connecting a target object to be isolated.
In the technical scheme of the invention, the suspension structure comprises: the shock insulation device comprises an upper spring plate, a shock insulation spring and a lower spring plate;
the number of the shock insulation springs is at least 3, and two ends of each shock insulation spring are fixedly connected with the upper spring plate and the lower spring plate respectively;
the upper spring plate is fixedly connected with the inner wall of the mounting rack; the lower spring plate is connected with the swing rod.
In the technical scheme of the invention, the shock insulation springs are uniformly arranged along the circumferential direction of the inner wall of the mounting frame;
when the shock insulation spring is in a free state, the upper spring plate and the lower spring plate are both in a horizontal state.
In the technical scheme of the invention, the upper spring plate is fixedly connected with the inner wall of the mounting frame through the connecting block;
the spring upper plate and the inner wall of the mounting frame are connected with the connecting block through bolts;
and bolt connecting holes are reserved in the inner wall of the mounting frame.
In the technical scheme of the invention, 3 swing rods are uniformly arranged along the circumferential direction of the inner wall of the mounting rack;
the swing rod is connected with the suspension structure and the hanging basket through universal hinges.
In the technical scheme of the invention, the cross section of the mounting rack is circular; the cross section of the hanging basket is in a regular polygon or a circle, and the hanging basket is collinear with the axis of the mounting rack.
In the technical scheme of the invention, in the step S1:
horizontal shock isolation period ThAnd a horizontal shaking period TshSatisfy Th>2·Tsh；
Vertical shock isolation period TvAnd vertical vibration period TsvSatisfy Tv>2·Tsv。
In the technical scheme of the invention, in the step S2, the length l of the swing rod meets the following requirements:
g is the acceleration of gravity.
In the technical scheme of the invention, in the step S4, the number N of the shock insulation springs satisfies the following condition:
FMthe maximum acting force which can be borne by the shock insulation spring; k is the stiffness coefficient of the shock isolation spring; m is the mass of the target object to be isolated; m is0The mass sum of a swing rod, a hanging basket and a spring lower plate for hanging the shock isolation device.
The beneficial effect of adopting the further scheme is that:
1. the invention adopts the spring to carry out vertical shock insulation, adopts the swing rod to carry out horizontal shock insulation, integrally belongs to a passive control device, does not need the input of external energy, has simple and convenient construction technology and high safety performance.
2. Adopt spring and pendulum rod shock attenuation, the simple structure, each part all adopts the unification design, makes things convenient for batch production processing, has reduced the degree of difficulty of installation and maintenance, and the security is high, has improved its reliability and durability greatly.
3. The invention can realize three-dimensional shock insulation. The shock insulation period can be conveniently adjusted by adjusting the length of the oscillating bar in the horizontal direction, and the shock insulation period far exceeding that of the conventional rubber support can be obtained. Vertical through vertical spring carry out the shock attenuation, vertical spring can be according to actual conditions adjustment quantity and rigidity, simple swift.
In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a schematic view of a suspension seismic isolation system of the present invention;
FIG. 2 is a cross-sectional view of the suspension seismic isolation system of the present invention taken along line A-A;
FIG. 3 is a cross-sectional view of a suspension seismic isolation system B-B of the present invention.
In the figure, 1, a target object to be isolated; 2. a mounting frame; 3. connecting blocks; 4. a bolt; 5. a spring upper plate; 6. a shock isolation spring; 7. a spring lower plate; 8. a swing rod; 9. a hanging basket; 10. a damper.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the term "connected" should be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection, which may be a mechanical connection, an electrical connection, which may be a direct connection, or an indirect connection via an intermediate medium. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The terms "top," "bottom," "above … …," "below," and "on … …" as used throughout the description are relative positions with respect to components of the device, such as the relative positions of the top and bottom substrates inside the device. It will be appreciated that the devices are multifunctional, regardless of their orientation in space.
The embodiment of the invention is applied to the field of seismic isolation and reduction, and the target object 1 to be isolated can be a precise instrument, equipment needing seismic isolation, a working platform, a control room, a safety room and the like. The objects 1 to be isolated are usually sensitive to earthquake and other vibration, and bring immeasurable life and property loss to operators and operation equipment.
The prior art usually adopts rubber shock insulation support, fixes and supports through rubber shock insulation support and treats shock insulation target object 1, can cause the three-dimensional vibrations of horizontal plane and vertical direction when considering that the earthquake takes place, consequently, rubber shock insulation support needs to have three-dimensional shock insulation effect simultaneously concurrently. However, the rubber material is difficult to be made into a material with low horizontal rigidity and high vertical rigidity, and the low rigidity is beneficial to shock insulation, so that the two-dimensional shock insulation effect in the horizontal plane is better, but the shock insulation effect in the vertical direction is slightly poor. Considering that rubber shock insulation support still needs to play the effect of supporting, vertical rigidity can not hang down excessively, consequently vertical direction is difficult to have supporting effect and shock insulation effect concurrently, for the supporting effect who guarantees rubber materials, can only give up the shock insulation effect of vertical direction to a certain extent, in addition the restriction of current rubber production technology, rubber materials's horizontal rigidity also can be great, corresponding horizontal direction's shock insulation effect also can receive great negative effect. That is, the rubber-vibration isolating support needs to use a rubber material having a low horizontal rigidity and a vertical rigidity at least satisfying a supporting effect, but it is difficult to produce such a rubber material with the existing production and manufacturing techniques.
The embodiment of the invention breakthroughs a mechanical structure to achieve the shock insulation effect, and specifically, as shown in fig. 1 to 3, the embodiment of the invention provides a suspension shock insulation device, which comprises: the device comprises an installation frame 2, a suspension structure, a swing rod 8, a hanging basket 9 and a damping unit; the mounting frame 2 is a frame with a circular or regular polygon section; the suspension structure can perform shock insulation in the vertical direction and is fixedly connected with the mounting frame 2; one end of the swing rod 8 is connected with the suspension structure, and the other end of the swing rod is connected with the hanging basket 9; the damping unit is provided with at least 1 group, and each group comprises at least 3 dampers 10; one end of the damper 10 is connected with the hanging basket 9, and the other end is connected with the inner wall of the mounting frame 2; the hanging basket 9 is used for connecting the object 1 to be isolated. The suspension structure, namely the swing rod 8 and the hanging basket 9, suspends the target object 1 to be isolated in the mounting frame 2, when vibration in the horizontal direction occurs, the swing rod 8 swings to drive the hanging basket 9 to move relative to the inner wall of the mounting frame 2, and the damper 10 can reduce the displacement of the hanging basket 9 relative to the mounting frame 2, so that the isolation of the horizontal plane is realized. In practical use, the mounting bracket 2 is not limited to a frame with a circular or regular polygon cross section, but may have other shapes, and the cross section of the mounting bracket 2 is preferably circular or regular polygon in consideration of enabling the vibration amplitude and the vibration isolation effect of the object 1 to be isolated in each direction of the horizontal plane to be the same as much as possible.
The embodiment of the invention breaks through the thinking fixed type that the traditional shock isolation device adopts special materials such as rubber and the like, realizes shock isolation by utilizing the mechanical property of the materials, realizes shock isolation by adopting a mechanical structure, and in addition, compared with the shock isolation devices of other mechanical structures, the embodiment of the invention does not need additional energy sources, realizes passive shock isolation by directly combining the swinging of the oscillating bar 8 and the damper 10, and has higher safety and simple and convenient construction.
The suspension structure uses a device capable of vertically isolating, can adopt the existing isolation bearing and also can adopt other structures with vertical isolation functions. In consideration of the limitation of the use of materials such as rubber, the embodiment of the invention also adopts a mechanical structure to realize the vertical shock insulation, and specifically, the suspension structure comprises: spring upper plate 5, isolation spring 6 and spring lower plate 7. The spring upper plate 5 is fixedly connected with the inner wall of the mounting frame 2, so that the object 1 to be isolated can be stably fixed with the mounting frame 2 through the suspension structure. Spring hypoplastron 7 is connected with pendulum rod 8, the both ends of shock insulation spring 6 respectively with spring upper plate 5 and spring hypoplastron 7 fixed connection, spring hypoplastron 7 receives the pulling force that pendulum rod 8 transmitted, can stretch shock insulation spring 6, can remain the parallel for spring upper plate 5 and spring hypoplastron 7 throughout, and then guarantee the shock insulation function of suspended structure's vertical direction, improve the wholeness of motion, shock insulation spring 6 is equipped with 3 at least, obvious shock insulation spring 6 should arrange and form polygonal structure, and not linear arrangement, prevent spring hypoplastron 7 upset. Illustratively, the upper spring plate 5 and the lower spring plate 7 are both circular rings, and 6 shock insulation springs 6 are arranged.
The suspension structure of the invention realizes the shock insulation function in the vertical direction through the shock insulation spring 6, realizes the two-dimensional shock insulation function in the horizontal plane through the combination of the oscillating bar 8 and the damper 10, can realize the three-dimensional space shock insulation function through the combination of the oscillating bar and the damper, has simple structure and high safety, and greatly improves the reliability and durability of the suspension structure.
Considering treating the installation and the shape of shock insulation target object 1, reserving the great space for treating shock insulation target object 1 as far as possible simultaneously under the prerequisite of guaranteeing the shock insulation effect, suspension structure, hanging flower basket 9 all leave the hole, treat that shock insulation target object 1 should leave fixed knot and construct, make the fixed knot who treats shock insulation target object 1 can pass the hole of suspension structure and hanging flower basket 9, guarantee the function of hanging.
In order to further improve the two-dimensional shock insulation effect in the horizontal plane, in the embodiment of the invention, the dampers 10 in the same group are positioned on the same horizontal plane, so that the force generated by the dampers 10 in the same group can be ensured to act on the same horizontal plane, the moment for turning the hanging basket 9 can not be generated, the dampers 10 in the same group are uniformly arranged along the circumferential direction of the inner wall of the mounting frame 2, and the shock insulation effect in each direction in the horizontal plane can be ensured to be the same.
In view of the stability of the basket 9, the basket 9 should be a spatial cylindrical structure, but may be other shapes, and in order to ensure the stability, the basket 9 should at least comprise an upper end surface and a lower end surface. Exemplarily, hanging flower basket 9 includes up end, lower terminal surface and spliced pole, and the up end is the annular with lower terminal surface, and is parallel to each other to connect through a plurality of spliced poles, the spliced pole is evenly set up along 2 inner wall circumference of mounting bracket. In order to improve the seismic isolation effect of the hanging basket 9, in the embodiment of the invention, the dampers 10 are arranged on the upper end surface and the lower end surface of the hanging basket 9, and the specific dampers 10 are provided with 2 groups: one group of dampers 10 are connected with the edge of the upper end face of the hanging basket 9, and the other group of dampers 10 are connected with the edge of the lower end face of the hanging basket 9. Illustratively, each set has 4 dampers 10, and the dampers are evenly arranged along the circumference of the inner wall of the mounting frame 2.
It should be specially noted that, if the cross section of the mounting frame 2 is a regular polygon, the number of sides is N, the shape of the hanging basket 9 is the same as that of the mounting frame 2, the number of the dampers 10 of each group of damping units is an integral multiple of N, and the number of the dampers 10 arranged on each side of the regular polygon is equal. Preferably, one damper 10 is arranged at each fixed point of the regular polygon, the other dampers 10 on each side are uniformly distributed, and the specific number of the dampers 10 can be set according to the required damping size.
In order to further improve the two-dimensional shock insulation effect in the horizontal plane, in the embodiment of the invention, the shock insulation springs 6 are uniformly arranged along the circumferential direction of the inner wall of the mounting frame 2, and when the shock insulation springs 6 are in a free state, the upper spring plate 5 and the lower spring plate 7 are in a horizontal state, so that when the lower spring plate 7 is pulled downwards, the acting force of each spring is the same, the acting force and the acting point in each direction in the horizontal plane are centrosymmetric, and the shock insulation springs 6 can be prevented from being damaged or the lower spring plate 7 can be prevented from being overturned due to the moment caused by asymmetry.
Considering that the bearing capacity of a single swing rod 8 is limited, and the object 1 to be isolated by vibration may need to pass through the suspension device and the hanging basket 9, the swing rod 8 is not suitable to be arranged at the axis of the embodiment of the invention, therefore, in the embodiment of the invention, 3 swing rods 8 are arranged along the circumferential direction of the inner wall of the mounting frame 2. The 3 swing rods 8 ensure the stability of the hanging basket 9 and are beneficial to leveling the hanging basket 9 in the installation process; if 2 swing rods 8 are used, it is difficult to enable the hanging basket 9 to be stably suspended; if more than 4 swing rods 8 are used, not only is the leveling difficulty of the hanging basket 9 increased, but also the stress conditions of each swing rod 8 may be different, and the service life of the swing rod 8 with larger stress can be greatly shortened, thereby affecting the safety and stability of the embodiment of the invention. Illustratively, one end of the swing rod 8 is connected with the lower plate 7 of the annular spring, and the other end is connected with the upper end face of the annular hanging basket 9.
Because the oscillating bar 8 and the hanging basket 9 form a structure similar to a simple pendulum when the object 1 to be isolated is subjected to vibration in a horizontal plane, and the oscillation in the horizontal plane is two-dimensional oscillation rather than linear one-dimensional oscillation, in the embodiment of the invention, one end of the oscillating bar 8 is connected with the spring lower plate 7 through a universal hinge, and the other end of the oscillating bar is connected with the hanging basket 9 through a universal hinge. Illustratively, the universal hinge may take the form of a ball hinge or a cross hinge.
In actual shock, the target object 1 to be isolated may generate translational shock or may swing, and particularly, in the case that the target object 1 to be isolated has a fixed structure, in order to prevent the target object 1 to be isolated from swinging, in the embodiment of the present invention, the center of gravity of the target object 1 to be isolated is not higher than the center of the hanging basket 9, and considering the actual installation difficulty, the center of gravity of the target object 1 to be isolated should be slightly lower than the center of the hanging basket 9 or be flush with the center of the hanging basket 9. It should be noted that although the pendulum bar 8 swings like a simple pendulum, the basket 9 moves in a translational manner since the pendulum bar 8 and the basket 3 are both connected to the basket 9.
Before the shock insulation device is actually used, the number of the shock insulation springs 6 and each group of dampers 10 and the length of the oscillating bar 8 can be determined according to actual shock insulation requirements. Different soil, the rock of 2 places of mounting bracket can influence the vibrations cycle when the earthquake produces, the natural cycle when shock isolation device design under the normal conditions should differ great with the vibrations cycle to prevent resonance and then realize the shock insulation, make the natural cycle of shock isolation device obvious be greater than the vibrations cycle during actual design usually, nevertheless too big natural cycle can increase the impact that buffering effect reduces the acceleration, but can increase shock isolation device's vibration amplitude, be unfavorable for the shock insulation equally. The embodiment of the invention comprehensively considers the factors of reducing acceleration impact and vibration amplitude, and the inherent period of horizontal plane vibration of the suspension shock isolation device is 3-4 s; the natural period of vertical vibration of the suspension vibration isolation device is 1.2s-1.5 s. The length of the swing rod 8 can affect the horizontal plane vibration inherent period of the suspension shock isolation device, the calculation process can refer to the simple pendulum period, the parameters and the number of the dampers 10 can affect the vibration amplitude in the horizontal plane, the rigidity and the number of the springs can affect the vertical vibration inherent period and the vibration amplitude of the suspension shock isolation device, and the calculation process can refer to the period of simple harmonic vibration.
In order to facilitate installation of the embodiment of the invention, the whole of the embodiment of the invention is of a cylinder-like structure, and the suspension structure, the swing rod 8, the hanging basket 9 and the damper 10 of the embodiment of the invention are respectively rotationally symmetrical by taking an axis as a central line. The length mechanical property of each spring is the same, the structure and performance parameters of each damper 10 are the same, and the shape of each oscillating bar 8 is the same, so that the mass production and the manufacturing of each part are facilitated, and the installation of the embodiment of the invention is also facilitated.
In addition, in the embodiment of the invention, the upper spring plate 5 is fixedly connected with the inner wall of the mounting frame 2 through the connecting block 3; the spring upper plate 5 and the inner wall of the mounting rack 2 are connected with the connecting block 3 through bolts 4. The shape of the connecting block 3 is not limited, and the spring upper plate 5 and the mounting frame 2 can be connected at the same time, and for example, an angle iron, a triangular block, a square block and the like can be adopted. In order to fix the embodiment of the invention to the inner wall of the mounting frame 2 conveniently, when the mounting frame 2 is excavated, a threaded hole needs to be reserved in the inner wall of the mounting frame 2 for being in threaded connection with the connecting block 3.
Correspondingly, the embodiment of the invention also provides a suspension shock insulation method, the method of the embodiment of the invention uses the suspension shock insulation device in the embodiment, and the steps comprise:
and S1, determining the horizontal vibration isolation period and the vertical vibration isolation period of the target object 1 to be isolated and the sectional shape and the size of the columnar mounting frame 2. Horizontal shock isolation period ThAnd a horizontal shaking period TshSatisfy Th>2·Tsh(ii) a Vertical shock isolation period TvAnd vertical vibration period TsvSatisfy Tv>2·Tsv. In order to ensure the shock insulation effect, the suspension shock insulation device needs to be prevented from forming resonance with external shock, so that the difference between the shock period of the shock insulation device and the shock period of the external shock is large, under the actual condition, the external shock to be received by a target object to be subjected to the shock insulation is often small in period, so that the shock insulation period of the shock insulation device is usually obviously larger than the shock period for achieving the purpose, the shock insulation function can be achieved by more than 2 times of the shock period, and the shock insulation effect can also be achieved according to the factThe actual seismic isolation effect, suitably adjusted, for example for seismic or explosive isolation, the seismic isolation period may be set to 5-10 times the period of vibration. The cross-sectional shape and size of the cylindrical mounting frame 2 can be set according to actual needs.
S2, determining the length of the oscillating bar 8 according to the horizontal shock isolation period; the length l of the swing rod 8 meets the following requirements:
g is the gravity acceleration, and the units all adopt standard international units. Namely, the simple pendulum period of the pendulum rod 8 when forming the simple pendulum system is more than or equal to the horizontal shock insulation period, and the realization of the horizontal shock insulation function is ensured.
S3, determining the number of the swing rods 8 according to the bearing capacity of the swing rods 8; the maximum bearing capacity of each oscillating bar 8 is a fixed parameter of the oscillating bar 8, and the total bearing capacity of all the oscillating bars 8 is larger than the total weight of the target object 1 to be isolated and the hanging basket 9.
S4, determining the number of the shock isolation springs 6 according to the bearing capacity and the vertical shock isolation period of the shock isolation springs 6; in step S4, the number N of the seismic isolation springs 6 satisfies:
FMthe maximum acting force which can be borne by the shock insulation spring 6; k is the stiffness coefficient of the shock isolation spring 6; m is the mass of the target object 1 to be isolated; m is0The mass sum of a swing rod 8, a hanging basket 9 and a spring lower plate 7 for hanging the shock insulation device. Namely, when the shock insulation spring 6 forms spring simple harmonic vibration, the simple harmonic vibration period is more than or equal to the vertical shock insulation period, and the realization of the vertical shock insulation function is ensured.
S5, building a suspension shock isolation device; the concrete connection relation can refer to the connection relation and the position relation of the suspension shock insulation device in the embodiment, and the installation sequence is that the installation frame 2 is fixed firstly, then the suspension structure is installed on the installation frame 2, and then the swing rod 8 and the hanging basket 9 are installed on the suspension structure.
And S6, connecting the vibration isolation device with the object 1 to be isolated, and installing a damping unit according to the requirement.
The method provided by the embodiment of the invention is used for isolating the seismic of the underground test equipment.
The mass m of the test equipment is 100t and is far larger than the sum of the masses of the swing rod 8, the hanging basket 9 and the spring lower plate 7 of the suspension shock isolation device, so that m is larger than m0Neglecting, the horizontal shock isolation period is 4s, and the vertical shock isolation period is 1 s.
Length of oscillating bar
Taking l as 4 m;
the stiffness k of a single shock isolation spring is 158kN/m, and the number N of the shock isolation springs is 25 after calculation. And the suspension shock isolation device is built according to the method, the shock isolation period of the suspension shock isolation device is measured, the actually measured horizontal shock isolation period is slightly larger than 4s, and the actually measured vertical shock isolation period is slightly larger than 1s, so that the design requirement is met.
In summary, the embodiment of the invention provides a suspension shock insulation method, compared with the prior art, the suspension shock insulation method can conveniently adjust the horizontal shock insulation period and the vertical shock insulation period, can realize a large horizontal shock insulation period by adjusting the length of the oscillating bar 8, realizes a good horizontal shock insulation effect, and has the characteristics of large shock insulation period, low manufacturing cost, excellent weather resistance, simple structure, safety, reliability and the like.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. A suspension seismic isolation method, characterized in that the steps of the suspension method comprise:
s1, determining the horizontal shock isolation period and the vertical shock isolation period of the target object (1) to be subjected to shock isolation and the sectional shape and size of the columnar mounting rack (2);
s2, determining the length of the swing rod (8) according to the horizontal shock isolation period;
s3, determining the number of the swing rods (8) according to the bearing capacity of the swing rods (8);
s4, determining the number of the shock insulation springs (6) according to the bearing capacity and the vertical shock insulation period of the shock insulation springs (6);
s5, building a suspension shock isolation device;
and S6, connecting a vibration isolation device with the object (1) to be isolated to carry out suspension vibration isolation.
2. The suspension seismic isolation method of claim 1, wherein the suspension seismic isolation apparatus comprises: the hanging device comprises a mounting frame (2), a hanging structure, a swing rod (8) and a hanging basket (9);
the mounting rack (2) is a frame with a circular or regular polygon cross section; the suspension structure can perform shock insulation in the vertical direction and is fixedly connected with the mounting rack (2); one end of the swing rod (8) is connected with the suspension structure, and the other end of the swing rod is connected with the hanging basket (9); the hanging basket (9) is used for connecting a target object (1) to be isolated.
3. The suspension seismic isolation method of claim 2, wherein the suspension structure comprises: the shock insulation device comprises an upper spring plate (5), a shock insulation spring (6) and a lower spring plate (7);
at least 3 shock insulation springs (6) are arranged, and two ends of each shock insulation spring (6) are fixedly connected with the upper spring plate (5) and the lower spring plate (7) respectively;
the spring upper plate (5) is fixedly connected with the inner wall of the mounting rack (2); the spring lower plate (7) is connected with the swing rod (8).
4. The suspension seismic isolation method according to claim 2, wherein the seismic isolation springs (6) are uniformly arranged along the circumferential direction of the inner wall of the mounting frame (2);
when the shock insulation spring is in a free state, the upper spring plate (5) and the lower spring plate (7) are both in a horizontal state.
5. The suspension seismic isolation method according to claim 4, wherein the spring upper plate (5) is fixedly connected with the inner wall of the mounting frame (2) through a connecting block (3);
the spring upper plate (5) and the inner wall of the mounting rack (2) are connected with the connecting block (3) through bolts (4);
and a bolt (4) connecting hole is reserved in the inner wall of the mounting frame (2).
6. The suspension seismic isolation method according to claim 2, wherein 3 oscillating bars (8) are uniformly arranged along the circumferential direction of the inner wall of the mounting rack (2);
the swing rod (8) is connected with the suspension structure and the hanging basket (9) through universal hinges.
7. Suspension seismic isolation method according to claim 2, characterized in that the cross-sectional shape of the mounting frame (2) is circular; the cross section of the hanging basket (9) is in a regular polygon shape or a circular shape, and the axis of the hanging basket (9) is collinear with the axis of the mounting rack (2).
8. The suspension seismic isolation method of claim 1, wherein in step S1:
horizontal shock isolation period ThAnd a horizontal shaking period TshSatisfy Th>2·Tsh；
Vertical shock isolation period TvAnd vertical vibration period TsvSatisfy Tv>2·Tsv。
9. Suspension seismic isolation method according to claim 1, wherein in step S2, the length l of the swing link (8) satisfies the following condition:
g is the acceleration of gravity.
10. Suspension seismic isolation method according to claim 1, wherein in step S4, the number N of seismic isolation springs (6) satisfies:
FMthe maximum acting force which can be borne by the shock insulation spring (6); k is the stiffness coefficient of the shock isolation spring (6); m is the mass of the target object (1) to be isolated; m is0The mass sum of a swing rod (8), a hanging basket (9) and a spring lower plate (7) for hanging a shock isolation device.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10176432A (en) * | 1996-12-19 | 1998-06-30 | Sumitomo Rubber Ind Ltd | Three-dimensional vibration isolation device |
| JPH11159191A (en) * | 1997-11-25 | 1999-06-15 | Toshiba Corp | Damper |
| CN103858057A (en) * | 2011-09-09 | 2014-06-11 | 迈普尔平版印刷Ip有限公司 | Vibration isolation module and substrate processing system |
| CN109138174A (en) * | 2018-09-28 | 2019-01-04 | 佛山科学技术学院 | A kind of suspension type energy consumption shock isolating pedestal |
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2019
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10176432A (en) * | 1996-12-19 | 1998-06-30 | Sumitomo Rubber Ind Ltd | Three-dimensional vibration isolation device |
| JPH11159191A (en) * | 1997-11-25 | 1999-06-15 | Toshiba Corp | Damper |
| CN103858057A (en) * | 2011-09-09 | 2014-06-11 | 迈普尔平版印刷Ip有限公司 | Vibration isolation module and substrate processing system |
| CN109138174A (en) * | 2018-09-28 | 2019-01-04 | 佛山科学技术学院 | A kind of suspension type energy consumption shock isolating pedestal |
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| Title |
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| 丰定国等: "《抗震结构设计》", 30 September 2001, 武汉工业大学出版社 * |
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