CN103821863B - A kind of adjustable pendulum-type multidimensional low frequency historical relic damping device - Google Patents

Abstract

The invention relates to an adjustable pendulum-type low-frequency cultural relics damping device, which includes an upper connecting rod, a tempered glass box, anchor bolts, an adjustable counterweight, a lower connecting rod, a disc spring, and an outer display cabinet, and is characterized in that: The upper end of the upper link is hinged with the exhibition cabinet, the lower end of the upper link is hinged with the tempered glass box, the bottom of the tempered glass box is fixed with the adjustable counterweight by the anchor bolt, and the lower link is The upper end is hinged with the adjustable counterweight, the lower end of the lower link is hinged with the disc spring, and the outer display cabinet limits the horizontal displacement of the disc spring. When an earthquake occurs, the adjustable pendulum low-frequency damping device for cultural relics swings at a very low frequency to achieve a good shock isolation effect.

Description

An adjustable pendulum type multi-dimensional low-frequency cultural relic shock absorber

technical field

The invention relates to a cultural relic anti-shock isolation device, which belongs to the field of safety protection and dynamic analysis of movable cultural relics.

Background technique

Movable cultural relics are an important part of world cultural heritage, with extremely important cultural and historical value, and protection is of great significance. The protection of these cultural relics requires not only fire protection and anti-theft requirements, but also earthquake resistance requirements. A large number of earthquake damage shows that floating cultural relics may cause serious damage when the seismic intensity is 3 to 4 degrees. Due to the unpredictability and great destructiveness of the earthquake, it is extremely urgent to take timely and effective anti-seismic measures for these cultural relics.

Judging from the status quo of the research and development of seismic isolation devices for floating cultural relics in the collection, there is a serious shortage in this area in China, while foreign countries such as Japan, the United States, Italy and other countries have generally promoted the use of different types of seismic isolation devices for cultural relics to realize cultural relics based on advanced technology. Shock protection. Different types of vibration isolation devices such as roller type, roller type, ball type, slider type, and friction pendulum type have been developed, and different types of vibration isolation materials such as air springs, constant force springs, magnets, and shape memory alloys have been applied, making cultural relics isolated The development prospect of the seismic device is broad. However, from the perspective of the seismic isolation effect of the cultural relics isolation device, it is necessary to achieve a simple structure, small volume, low conduction ratio (the ratio of the peak response acceleration of the cultural relic to the peak acceleration of the input seismic wave), avoid vertical swing, and ensure the reliability of the isolation device. Performance and durability are still important issues.

Most of the existing seismic isolation devices for cultural relics are mainly horizontal isolation, while the vertical seismic component often plays an important role. From the perspective of horizontal restoring force components, traditional springs need to be vertically double-layered to achieve horizontal vibration isolation in any direction. However, the surface roller or ball device based on the gravity restoring force is prone to the problem of parts flying out due to excessive horizontal seismic force. From the perspective of vertical restoring force components, traditional springs are prone to vertical bending problems due to excessive static deflection, and the components are complex in structure and occupy a large vertical space. Therefore, it is necessary to develop and manufacture a multi-dimensional cultural relic shock absorbing device that is simple to manufacture, has a clear mechanism, and has obvious effects.

Contents of the invention

Most of the existing seismic isolation devices for cultural relics are mainly horizontal isolation, while the vertical seismic component often plays an important role. From the perspective of horizontal restoring force components, traditional springs need to be vertically double-layered to achieve horizontal vibration isolation in any direction. However, the surface roller or ball device based on the gravity restoring force is prone to the problem of parts flying out due to excessive horizontal seismic force. From the perspective of vertical restoring force components, traditional springs are prone to vertical bending problems due to excessive static deflection, and the components are complex in structure and occupy a large vertical space. Based on this, the present invention attempts to solve the above-mentioned problems through the research and development of an adjustable pendulum-type cultural relic low-frequency damping device.

In order to achieve the above purpose, the technical solution adopted by the present invention is an adjustable pendulum-type cultural relics low-frequency shock absorber, which includes an upper connecting rod, a tempered glass box, anchor bolts, an adjustable counterweight, a lower connecting rod, a disc spring, Outer display cabinet; wherein, one end of the upper connecting rod is hinged with the outer display cabinet, and the other end of the upper connecting rod is hinged with the tempered glass box; the place where the tempered glass box is placed for cultural relics is fixed with the anchor bolt A heavy block; one end of the lower connecting rod is hinged with the adjustable counterweight, and the other end of the lower connecting rod is hinged with the disc spring; the outer display cabinet limits the horizontal displacement of the disc spring.

The upper connecting rod and the lower connecting rod are made of light and high-strength materials, such as metal matrix composite materials; the ratio of the length of the upper connecting rod to the length of the lower connecting rod is greater than 2.

The material of the adjustable counterweight is lead alloy, zinc alloy and cast iron, the length and width of the adjustable counterweight are the same as the tempered glass box, and the adjustable counterweight is fixed to the The bottom of the tempered glass box can change the quality by changing the quantity of the adjustable counterweight.

The tempered glass box uses fully tempered glass, and the tempered glass box has a built-in friction cushion.

The stiffness of the disc spring can be changed by changing the number of reeds.

When the shock-isolated cultural relic cabinet is subjected to an earthquake, the disc spring is stretched and compressed to resist the earthquake in the vertical direction. The tempered glass box is hinged with the upper link and the lower link, and swings in the horizontal direction at a low frequency. Resist the earthquake action in the horizontal direction, and then achieve the purpose of earthquake isolation.

The present invention adopts the principle of the parallel vibration isolation system of the single pendulum and the inverted pendulum, the mass sum of the toughened glass box and the adjustable mass block is m, the upper end of the toughened glass box is hinged with the upper link whose length is L1 to form _a single pendulum, which is called a positive pendulum ; _The lower end of the adjustable counterweight is hinged with a lower link with a length of L2, and the lower end of the lower link is hinged with a disc spring with a stiffness of _Ks to form an inverted pendulum. The simple pendulum and the inverted pendulum are connected in parallel through a toughened glass box and an adjustable counterweight. The rod length ratio L _r = L ₁ /L ₂ , the initial compression of the disc spring is ΔL, and when the system is in the equilibrium position, the system stiffness is: $K\left(0\right)=\frac{\mathrm{mg}}{L_1}-\frac{K_{\mathrm{the\; s}}\mathrm{\Δ\; L}}{L_1(1+L_r)},$ If K(0)=0, we get $\mathrm{\ΔL}=\frac{\mathrm{Mg}}{K_{\mathrm{the\; s}}(L_r+1)},$ when $\mathrm{\Δ\; L}=\frac{\mathrm{Mg}}{K_{\mathrm{the\; s}}(L_r+1)}$ When , the stiffness of the vibration isolation system in the horizontal direction is 0, and the vibration isolation system achieves the effect of low frequency vibration isolation. With the decrease of L _r , the system can have a lower stiffness in a larger range from the equilibrium point, which is suitable for the external vibration amplitude larger case. As K _s decreases, the range in which the system has low stiffness increases. By selecting the values of L _r and K _s reasonably, the natural frequency of the vibration isolation system is low enough to achieve the purpose of low frequency vibration isolation.

Compared with the prior art, the present invention has the following beneficial effects.

The invention adopts the principle of the parallel vibration isolation system of the single pendulum and the inverted pendulum, and the whole device is easy to manufacture, has a clear mechanism and obvious anti-seismic effect, and plays a very good role in protecting cultural relics.

Description of drawings

Figure 1 is a schematic diagram of an adjustable pendulum cultural relic low-frequency damping device.

Fig. 2 is a three-dimensional diagram of the adjustable pendulum cultural relics low-frequency damping device.

Fig. 3 is a side view of the adjustable pendulum cultural relic low-frequency damping device.

Figure 4 is a plan view of the adjustable counterweight.

Figure 5 is a side view of the Belleville spring.

In the figure: 1, upper connecting rod, 2, tempered glass box, 3, adjustable counterweight, 4, anchor bolt, 5, lower connecting rod, 6, disc spring, 7, outer display cabinet.

Detailed ways

As shown in Figure 1, one end of the upper connecting rod 1 is hinged to the exhibition cabinet 7, and the other end of the upper connecting rod 1 is hinged to the tempered glass box 2; One end of the connecting rod 5 is hinged with the adjustable counterweight 3, the other end of the lower connecting rod 5 is hinged with the disc spring 6, and the outer display cabinet 7 limits the horizontal displacement of the disc spring 6.

The upper connecting rod 1 and the lower connecting rod 5 are made of metal matrix composite material to ensure light weight and high strength.

Example

The length of the upper connecting rod 1 is 1.5m, and the length of the lower connecting rod 5 is 0.7m, so that the ratio of the length of the upper connecting rod 1 to the length of the lower connecting rod 5 is greater than 2. Adjustable counterweight 3, made of zinc alloy, adjustable counterweight 3 length 70cm, width 50cm, thickness 1cm, quantity 2, quality 30kg Adjustable counterweight 3 is fixed to the tempered glass box with 4 anchor bolts 2 bottom. The toughened glass box 2 is 70cm long, 50cm wide, and 80cm high. It uses fully tempered glass. The tempered glass box 2 has a built-in friction cushion to ensure sufficient friction between the cultural relics and the glass box. Disc spring 6 stiffness is 20N/mm.

Claims (6)

1. an adjustable pendulum-type historical relic low frequency damping device, is characterized in that: comprise connecting rod (1), toughened glass case (2), anchor bolt (3), adjustable counterweight block (4), lower link (5), belleville spring (6), outer showcase (7); Wherein, described upper connecting rod (1) one end and described outer showcase (7) hinged, upper connecting rod (1) the other end and toughened glass case (2) hinged; Described toughened glass case (2) places the fixing adjustable counterweight block (4) of Cultural Relic Bureau's described anchor bolt (3); Described lower link (5) one end and adjustable counterweight block (4) hinged, lower link (5) the other end and described belleville spring (6) hinged; Described outer showcase (7) limits described belleville spring (6) Horizontal displacement.

2. one according to claim 1 adjustable pendulum-type historical relic low frequency damping device, is characterized in that: described upper connecting rod (1) and lower link (5) are for lightweight and the high metal-base composites of intensity; Upper connecting rod (1) length and lower link (5) length ratio are greater than 2.

3. one according to claim 1 adjustable pendulum-type historical relic low frequency damping device, is characterized in that: described adjustable counterweight block (4), material selection lead alloy, zinc alloy, cast iron; Described adjustable counterweight block (4) length and width are identical with described toughened glass case (2); Described adjustable counterweight block (4) is fixed on described toughened glass case (2) bottom with described anchor bolt (3), can change quality size by changing described adjustable counterweight block (4) quantity.

4. one according to claim 1 adjustable pendulum-type historical relic low frequency damping device, is characterized in that: described toughened glass case (2) uses full tempered glass, the built-in friction bedding of described toughened glass case (2).

5. one according to claim 1 adjustable pendulum-type historical relic low frequency damping device, is characterized in that: described belleville spring (6) is by changing reed quantity to change rigidity.

6. one according to claim 1 adjustable pendulum-type historical relic low frequency damping device, it is characterized in that: when shock insulation cultural relic cabinet is subject to geological process, belleville spring (6) is subject to Tension and Compression, resist the geological process of vertical direction, toughened glass case (2) and upper connecting rod (1) and lower link (5) hinged, and swing in the horizontal direction with low frequency, the geological process of opposing substantially horizontal, and then reach the object of shock insulation.