Spring-connecting rod vertical variable stiffness isolation bearing

Abstract

The present invention relates to the field of seismic isolation technology, specifically a spring-connecting rod vertical variable stiffness seismic isolation support, comprising: an upper connecting plate and a lower connecting plate arranged in parallel up and down, a vertical telescopic guide rod evenly connected between the upper connecting plate and the lower connecting plate; a first spring mechanism evenly distributed and hinged on the bottom surface of the upper connecting plate, an intermediate connecting plate hinged at the bottom end of the first spring mechanism, a second spring mechanism arranged between the intermediate connecting plate and the lower connecting plate; a horizontal telescopic guide rod is arranged between each intermediate connecting plate, a first connecting rod is arranged between the top surface of each intermediate connecting plate and the center position of the bottom surface of the upper connecting plate, and a second connecting rod is arranged between the bottom surface of each intermediate connecting plate and the center position of the top surface of the lower connecting plate. Through the spring mechanism and the connecting rod, it can have a high static stiffness and bearing capacity under static load, and the stiffness under dynamic load is variable and lower than the static stiffness, so that the vertical low-frequency seismic isolation effect is good.

Description

Technical Field

[0001] The present invention relates to the technical field of seismic isolation, in particular to a spring-connecting rod vertical variable stiffness seismic isolation support. Background Art

[0002] Under the influence of earthquakes, some important equipment, such as medical equipment, substation cabinets, and cultural relic display cabinets, may be affected by the earthquake, resulting in reduced accuracy or damage. At the same time, a large number of earthquake records show that vertical seismic motion often exceeds horizontal seismic motion, so the impact of vertical seismic motion cannot be ignored.

[0003] At present, the rubber bearings widely used in engineering projects have no seismic isolation effect on vertical seismic motion. Therefore, the research of three-dimensional seismic isolation technology becomes necessary. However, the existing three-dimensional seismic isolation bearings have large vertical stiffness and high natural frequency, which cannot meet the needs of isolating low-frequency vibrations. Summary of the Invention

[0004] In response to the above problems, an embodiment of the present invention provides a spring-connecting rod vertical variable stiffness seismic isolation bearing.

[0005] One aspect of the present invention provides a spring-connecting rod vertical variable stiffness seismic isolation bearing, comprising: an upper connecting plate and a lower connecting plate arranged in parallel above and below, a vertical telescopic guide rod evenly connected between the upper connecting plate and the lower connecting plate; a first spring mechanism is evenly distributed and hinged on the bottom surface of the upper connecting plate, an intermediate connecting plate is hinged at the bottom end of the first spring mechanism, a second spring mechanism is arranged between the intermediate connecting plate and the lower connecting plate, and the two ends of the second spring mechanism are hinged to the intermediate connecting plate and the lower connecting plate respectively; a horizontal telescopic guide rod is arranged between each intermediate connecting plate, a first connecting rod is arranged between the top surface of each intermediate connecting plate and the center position of the bottom surface of the upper connecting plate, the two ends of the first connecting rod are hinged to the intermediate connecting plate and the upper connecting plate respectively, a second connecting rod is arranged between the bottom surface of each intermediate connecting plate and the center position of the top surface of the lower connecting plate, and the second connecting rod is hinged to the intermediate connecting plate and the lower connecting plate respectively.

[0006] Compared with the prior art, the beneficial effects of the present invention are: through the spring mechanism and the connecting rod, it can have higher static stiffness and bearing capacity under static load, and the stiffness under dynamic load is variable and lower than the static stiffness, so that the vertical low-frequency seismic isolation effect is good.

[0007] Optionally, the first spring mechanism and the second spring mechanism have the same structure, including a cylindrical sleeve, a coil spring is arranged in the cylindrical sleeve, and universal hinges are arranged at both ends of the cylindrical sleeve.

[0008] Optionally, both ends of the first connecting rod and the second connecting rod are provided with universal joints; the first connecting rod is hinged to the middle connecting plate and the upper connecting plate through the universal joint, and the second connecting rod is hinged to the middle connecting plate and the lower connecting plate through the universal joint.

[0009] Optionally, the horizontal telescopic guide rod includes a horizontal sleeve, the horizontal sleeve is cross-shaped, a horizontal guide rod is arranged in the horizontal sleeve, and the end of the horizontal guide rod is connected to the side of the middle connecting plate.

[0010] Optionally, the vertical telescopic guide rod is arranged between the four corners of the upper connecting plate and the lower connecting plate, and the vertical telescopic guide rod includes a vertical guide rod arranged on the upper connecting plate and a vertical sleeve arranged on the lower connecting plate, and the vertical guide rod is inserted into the vertical sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of this application, and do not constitute a limitation of the present invention. In the drawings:

[0012] Figure 1 A schematic diagram of the three-dimensional structure of a spring-connecting rod vertical variable stiffness seismic isolation support provided by an embodiment of the present invention;

[0013] Figure 2 A schematic diagram of the main cross-sectional structure of a spring-connecting rod vertical variable stiffness seismic isolation support provided by an embodiment of the present invention;

[0014] Figure 3 A schematic diagram of the three-dimensional structure of a spring mechanism provided in an embodiment of the present invention;

[0015] Figure 4 A schematic diagram of a front cross-sectional structure of a spring mechanism provided by an embodiment of the present invention;

[0016] Figure 5 A schematic structural diagram of a connecting rod portion provided by an embodiment of the present invention;

[0017] Figure 6 A schematic structural diagram of a horizontal telescopic guide rod provided in an embodiment of the present invention.

[0018] Among them, the upper connecting plate 1, the lower connecting plate 2, the vertical telescopic guide rod 3, the first spring mechanism 4, the middle connecting plate 5, the second spring mechanism 6, the horizontal telescopic guide rod 7, the first connecting rod 8, the second connecting rod 9, the cylindrical sleeve 10, the coil spring 11, the universal hinge 12, the horizontal sleeve 13, and the horizontal guide rod 14. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0020] It should be noted that, in this document, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0021] See also Figure 1 and Figure 2 , an embodiment of the present invention provides a spring-connecting rod vertical variable stiffness seismic isolation bearing, comprising: an upper connecting plate 1 and a lower connecting plate 2 arranged in parallel above and below, and vertical telescopic guide rods 3 are evenly connected between the upper connecting plate 1 and the lower connecting plate 2; a first spring mechanism 4 is evenly distributed and hinged on the bottom surface of the upper connecting plate 1, and an intermediate connecting plate 5 is hinged at the bottom end of the first spring mechanism 4, and a second spring mechanism 6 is arranged between the intermediate connecting plate 5 and the lower connecting plate 2, and the two ends of the second spring mechanism 6 are hinged to the intermediate connecting plate 5 and the lower connecting plate 2 respectively; a horizontal telescopic guide rod 7 is arranged between each intermediate connecting plate 5, a first connecting rod 8 is arranged between the top surface of each intermediate connecting plate 5 and the center position of the bottom surface of the upper connecting plate 1, and the two ends of the first connecting rod 8 are hinged to the intermediate connecting plate 5 and the upper connecting plate 1 respectively, and a second connecting rod 9 is arranged between the bottom surface of each intermediate connecting plate 5 and the center position of the top surface of the lower connecting plate 2, and the second connecting rod 9 is hinged to the intermediate connecting plate 5 and the lower connecting plate 2 respectively.

[0022] In implementation, see Figure 3 and Figure 4 The first spring mechanism 4 and the second spring mechanism 6 have the same structure, including a cylindrical sleeve 10, a coil spring 11 is arranged in the cylindrical sleeve 10, and a universal hinge 12 is arranged at both ends of the cylindrical sleeve 10; during production, the two ends of the coil spring 11 can be ground flat, pre-compressed and placed in the cylindrical sleeve 10, and the two ends of the cylindrical sleeve 10 are connected to the universal hinge 12 by bolts, and the universal hinge 12 is also connected to the upper connecting plate 1, the lower connecting plate 2 and the middle connecting plate 5 by bolts; under static load, the spring mechanism remains in a vertical state, which is equivalent to an ordinary coil spring. When vibration occurs, the connecting rod drives the spring mechanism to tilt, and a force with negative stiffness characteristics is generated by the connecting rod, which is jointly borne by the vertical force generated by the coil spring.

[0023] See also Figure 5 Both ends of the first connecting rod 8 and the second connecting rod 9 are provided with universal hinges 12; the first connecting rod 8 is hinged to the middle connecting plate 5 and the upper connecting plate 1 through the universal hinge 12, and the second connecting rod 9 is hinged to the middle connecting plate 5 and the lower connecting plate 2 through the universal hinge 12.

[0024] See also Figure 6 The horizontal telescopic guide rod 7 includes a horizontal sleeve 13, which is cross-shaped. A horizontal guide rod 14 is arranged in the horizontal sleeve 13, and the end of the horizontal guide rod 14 is connected to the side of the intermediate connecting plate 5; the horizontal displacement of the intermediate connecting plate 5 is realized.

[0025] The vertical telescopic guide rod 3 is arranged between the four corners of the upper connecting plate 1 and the lower connecting plate 2. The vertical telescopic guide rod 3 includes a vertical guide rod arranged on the upper connecting plate 1 and a vertical sleeve arranged on the lower connecting plate 2. The vertical guide rod is inserted into the vertical sleeve to ensure that no lateral displacement occurs between the upper and lower connecting plates.

[0026] The spring-connecting rod vertical variable stiffness seismic isolation bearing provided by the embodiment of the present invention is jointly supported by a spring mechanism and a connecting rod in parallel; under static load, the spring mechanism is equivalent to an ordinary coil spring, and is only supported by the spring mechanism, and the connecting rod is not subjected to force; when the ground vibrates, it drives the lower connecting plate 2 upward or downward, and the connecting rods are compressed or stretched, and then drives the middle connecting plate 5 to move horizontally, and the corresponding spring mechanism tilts. The spring mechanism and the connecting rod are connected in parallel to realize the positive and negative stiffness parallel principle. The stiffness of the bearing changes during vibration and is lower than the static stiffness, which can effectively reduce the vertical equivalent stiffness of the bearing, which is beneficial to low-frequency seismic isolation.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention.

Claims

1. A spring-connecting rod vertical variable stiffness seismic isolation support, characterized in that: The cam is hinged to the bottom of the cam and is hinged to the bottom of the cam, and the cam is hinged to the bottom of the cam. The first spring mechanism and the second spring mechanism have the same structure, comprising a cylindrical sleeve, a coil spring disposed in the cylindrical sleeve, and universal hinges disposed at both ends of the cylindrical sleeve; The horizontal telescopic guide rod comprises a horizontal sleeve which is cross-shaped. A horizontal guide rod is arranged in the horizontal sleeve, and the end of the horizontal guide rod is connected to the side surface of the middle connecting plate.

2. The spring-connecting rod vertical variable stiffness seismic isolation support according to claim 1, characterized in that: Both ends of the first connecting rod and the second connecting rod are provided with universal hinges; the first connecting rod is hinged to the middle connecting plate and the upper connecting plate through the universal hinge, and the second connecting rod is hinged to the middle connecting plate and the lower connecting plate through the universal hinge.

3. The spring-connecting rod vertical variable stiffness seismic isolation support according to claim 1, characterized in that: The vertical telescopic guide rod is arranged between the four corners of the upper connecting plate and the lower connecting plate. The vertical telescopic guide rod comprises a vertical guide rod arranged on the upper connecting plate and a vertical sleeve arranged on the lower connecting plate. The vertical guide rod penetrates into the vertical sleeve.

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