Spring-track vertical stiffness variable isolation bearing

Abstract

The application relates to the technical field of shock insulation, in particular to a spring-rail vertical variable stiffness shock insulation support, which comprises an upper connecting plate and a lower connecting plate, a vertical telescopic guide rod is arranged between the upper connecting plate and the lower connecting plate, and a vertical spiral spring is arranged between the upper connecting plate and the lower connecting plate; a middle vertical connecting plate is arranged in the middle of the bottom surface of the upper connecting plate, a horizontal limiting rod is arranged on the middle vertical connecting plate, end vertical connecting plates are slidably sleeved with both ends of the horizontal limiting rod, and horizontal spiral springs are arranged between the middle vertical connecting plate and the end vertical connecting plates; a rail plate is arranged on the lower connecting plate, horizontal rollers are arranged on the end vertical connecting plates, and a limiting table is arranged on the rail plate. The vertical spiral spring serves as a positive stiffness structure, the middle vertical connecting plate, the horizontal limiting rod, the end vertical connecting plates, the horizontal rollers and the rail plate serve as a negative stiffness structure, the two structures are matched with each other to realize vertical variable stiffness, the support has the characteristics of high static stiffness and low dynamic stiffness, and is beneficial to vertical low-frequency shock insulation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shock isolation, in particular to a spring-rail vertical variable stiffness shock isolation bearing. BACKGROUND

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

[0003] At present, the rubber bearing widely used in engineering has no shock isolation effect on vertical ground motion, so the research on three-dimensional shock isolation technology is necessary, and the vertical stiffness of the existing three-dimensional shock isolation bearing is large, and the natural frequency is high, which cannot meet the demand of isolating low-frequency vibration. SUMMARY

[0004] In view of the above problems, the present application provides a spring-rail vertical variable stiffness shock isolation bearing.

[0005] In one aspect of the present application, a spring-rail vertical variable stiffness shock isolation bearing is provided, which comprises upper and lower connecting plates arranged in parallel, vertical telescopic guide rods arranged uniformly between the upper and lower connecting plates, and vertical spiral springs arranged between the upper and lower connecting plates, the vertical spiral springs being symmetrically arranged with the center line of the upper connecting plate and the center line of the lower connecting plate as the axis of symmetry; a middle vertical connecting plate is arranged at the middle position of the bottom surface of the upper connecting plate, a horizontal limiting rod is fixedly arranged on the middle vertical connecting plate, and end vertical connecting plates are slidably arranged at the two ends of the horizontal limiting rod opposite to the middle vertical connecting plate; horizontal spiral springs are arranged between the middle vertical connecting plate and the end vertical connecting plates; a rail plate is arranged on the top surface of the lower connecting plate opposite to the end vertical connecting plate; a horizontal roller is arranged on the outer side surface of the end vertical connecting plate; a limiting block with a semicircular cross section is arranged on the inner side surface of the rail plate opposite to the horizontal roller; the horizontal roller abuts against the limiting block, and the axis of the horizontal roller is at the same height as the axis of the limiting block.

[0006] Compared with the prior art, the present application has the following advantages: the vertical spiral spring is a positive stiffness structure, the middle vertical connecting plate, the horizontal limiting rod, the end vertical connecting plate, the horizontal roller and the rail plate are negative stiffness structures, and the vertical stiffness is variable by mutual cooperation of the two, and the bearing has the characteristics of high static stiffness and low dynamic stiffness, which is beneficial to vertical low-frequency shock isolation.

[0007] Optionally, a first boss is arranged opposite between the bottom surface of the upper connecting plate and the top surface of the lower connecting plate, the diameter of the first boss is matched with the inner diameter of the vertical spiral spring, and the vertical spiral spring is clamped between the two first bosses opposite to each other.

[0008] Optionally, second bosses are provided on both side surfaces of the middle vertical connecting plate, second bosses are provided on the side surfaces of the end vertical connecting plate opposite to the middle vertical connecting plate, and the horizontal coil spring is clamped between the two opposite second bosses.

[0009] Optionally, the horizontal limiting rods are passed through and fixed at the four corner positions of the middle vertical connecting plate.

[0010] Optionally, the vertical telescopic guide rods are arranged between the four corners of the upper connecting plate and the lower connecting plate. 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 main structure of a spring-track vertical variable stiffness seismic isolation bearing provided by an embodiment of the present invention;

[0013] Figure 2 A schematic side structural diagram of a spring-track vertical variable stiffness seismic isolation bearing provided by an embodiment of the present invention;

[0014] Figure 3 for Figure 1 AA-axis cross-sectional structural diagram;

[0015] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0016] Figure 5 A schematic structural diagram of an intermediate vertical connecting plate provided in an embodiment of the present invention;

[0017] Figure 6 A schematic structural diagram of an end vertical connection plate provided in an embodiment of the present invention;

[0018] Figure 7 A schematic structural diagram of an upper connecting plate provided in an embodiment of the present invention;

[0019] Figure 8 A schematic structural diagram of a lower connecting plate provided in an embodiment of the present invention.

[0020] Among them, the upper connecting plate 1, the lower connecting plate 2, the vertical telescopic guide rod 3, the vertical coil spring 4, the middle vertical connecting plate 5, the horizontal limit rod 6, the end vertical connecting plate 7, the horizontal coil spring 8, the track plate 9, the horizontal roller 10, the limit platform 11, the first boss 12, the guide rod mounting hole 13, the connecting plate mounting hole 14, the track plate mounting hole 15, and the second boss 16. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] See also Figures 1-4 , a spring-track vertical variable stiffness seismic isolation support provided by an embodiment of the present invention comprises an upper connecting plate 1 and a lower connecting plate 2 arranged in parallel above and below, vertical telescopic guide rods 3 are evenly distributed between the upper connecting plate 1 and the lower connecting plate 2, vertical coil springs 4 are arranged between the upper connecting plate 1 and the lower connecting plate 2, and the vertical coil springs 4 can be arranged in two rows, and the vertical coil springs 4 are symmetrically arranged with the line connecting the center of the upper connecting plate 1 and the center of the lower connecting plate 2 as the symmetry axis; an intermediate vertical connecting plate 5 is provided in the middle position of the bottom surface of the upper connecting plate 1, and a horizontal limiting rod 6 is fixed on the intermediate vertical connecting plate 5, and both ends of the horizontal limiting rod 6 The end vertical connecting plates 7 opposite to the middle vertical connecting plate 5 are respectively slidably sleeved, and a horizontal coil spring 8 is provided between the middle vertical connecting plate 5 and the end vertical connecting plate 7; a track plate 9 is provided on the top surface of the lower connecting plate 2 opposite to the end vertical connecting plate 7, and a horizontal roller 10 is provided on the outer surface of the end vertical connecting plate 7. The horizontal roller is located in the horizontal middle position of the end vertical connecting plate 7, and a limit platform 11 with a semicircular cross-section is provided on the inner side surface of the track plate 9 opposite to the horizontal roller 10. The horizontal roller 10 is abutted against the limit platform 11 and the axis of the horizontal roller 10 is at the same height as the axis of the limit platform 11.

[0024] In implementation, see Figure 7 and Figure 8 A first boss 12 is arranged between the bottom surface of the upper connecting plate 1 and the top surface of the lower connecting plate 2. The diameter of the first boss 12 is adapted to the inner diameter of the vertical coil spring 4. The vertical coil spring 4 is clamped between the two first bosses 12 opposite to each other.

[0025] The upper connecting plate 1 and the lower connecting plate 2 can be rectangular plates, and the vertical telescopic guide rod 3 is arranged between the four corners of the upper connecting plate 1 and the lower connecting plate 2; specifically, guide rod mounting holes 13 can be opened on the upper connecting plate 1 and the lower connecting plate 2 near the four corners, and the vertical sleeve in the vertical telescopic guide rod 3 is installed at the guide rod mounting hole 13 of the lower connecting plate 2 by bolts, and the vertical guide rod in the vertical telescopic guide rod 3 is installed at the guide rod mounting hole 13 of the upper connecting plate 1 by bolts; the vertical guide rod is inserted into the vertical sleeve and the two slide together.

[0026] A connecting plate mounting hole 14 can be opened in the middle position of the upper connecting plate 1, and a threaded blind hole is correspondingly provided on the top of the middle vertical connecting plate 5 and is installed at the connecting plate mounting hole 14 by bolts; a track plate mounting hole 15 is provided on the lower connecting plate, and the track plate 9 is installed at the track plate mounting hole 15 by bolts.

[0027] In implementation, see Figure 5 and Figure 6 , second bosses 16 are provided on both side surfaces of the middle vertical connecting plate 5, and second bosses 16 are provided on the side opposite to the end vertical connecting plate 7 and the middle vertical connecting plate 5. The diameter of the second boss 16 is adapted to the inner diameter of the horizontal coil spring, and the horizontal coil spring 8 is clamped between the two opposite second bosses 16; during the manufacturing process, the horizontal coil spring 8 is pre-compressed between the middle vertical connecting plate 5 and the end vertical connecting plate 7 through the second boss 16, and the horizontal limit rod 6 ensures the telescopic movement of the horizontal coil spring 8 in the horizontal direction. In the initial state, the horizontal roller The axis of 10 is at the same height as the axis of the limit platform 11, and there is no vertical component of force between the two. When the lower connecting plate 2 moves upward from the initial position, the compression of the horizontal coil spring 8 decreases, the elastic restoring force decreases, and the track plate 9 provides a downward vertical component of force to the horizontal roller 10 through the limit platform 11; when the lower connecting plate 2 moves downward from the initial position, the compression of the horizontal coil spring 8 decreases, the elastic restoring force decreases, and the corresponding track plate 9 provides an upward vertical component of force to the horizontal roller 10 through the limit platform 11, realizing the load-displacement relationship of the negative stiffness principle.

[0028] The middle vertical connecting plate 5 can be a rectangular plate, and the horizontal limiting rods 6 are passed through and fixed at the four corners of the middle vertical connecting plate 5; after the horizontal limiting rods 6 pass through the middle vertical connecting plate 5, top screws can be used to achieve fixation between the two.

[0029] In the solution provided by the embodiment of the present invention, the vertical coil spring 4 serves as a positive stiffness structure, the middle vertical connecting plate 5, the horizontal limit rod 6, the end vertical connecting plate 7, the horizontal roller 10 and the track plate 9 serve as a negative stiffness structure, and the positive stiffness structure and the negative stiffness structure device jointly bear the load; in the initial state, the axis of the horizontal roller 10 and the axis of the limit platform 11 are equal in height, and the negative stiffness structure does not exert force, and only the vertical coil spring 4 is compressed to bear the upper load. When the lower connecting plate 2 moves upward or downward, the positive stiffness structure and the negative stiffness structure jointly bear the load, that is, the stiffness of the support changes during vibration, which effectively reduces the vertical equivalent stiffness of the support, and the support has the characteristics of high static stiffness and low dynamic stiffness, which is conducive to low-frequency seismic isolation.

[0030] 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-track vertical variable stiffness seismic isolation support, characterized in that: The axle up and down groove at two ends embeds respectively in two guide rails up and down of being made up of the groove on the attachment piece, and the tooth on the attachment piece is meshed with tooth on upper sprocket wheel, the lower sprocket. In the initial state, the axis of the horizontal roller and the axis of the limit platform are at the same height, and there is no vertical component of force between the two. When the lower connecting plate moves upward from the initial position, the compression of the horizontal coil spring decreases, the elastic restoring force decreases, and the track plate provides a downward vertical component of force to the horizontal roller through the limit platform; when the lower connecting plate moves downward from the initial position, the compression of the horizontal coil spring decreases, the elastic restoring force decreases, and the corresponding track plate provides an upward vertical component of force to the horizontal roller through the limit platform, realizing the load-displacement relationship of the negative stiffness principle; The horizontal limiting rods are passed through and fixed at the four corners of the middle vertical connecting plate; the vertical telescopic guide rods are arranged between the four corners of the upper connecting plate and the lower connecting plate.

2. The spring-rail vertical variable stiffness seismic isolation support according to claim 1, characterized in that: A first boss is arranged between the bottom surface of the upper connecting plate and the top surface of the lower connecting plate. The diameter of the first boss matches the inner diameter of the vertical coil spring. The vertical coil spring is clamped between the two first bosses facing each other.

3. The spring-rail vertical variable stiffness seismic isolation support according to claim 1, characterized in that: Second bosses are provided on both side surfaces of the middle vertical connecting plate, second bosses are provided on the side surfaces of the end vertical connecting plate opposite to the middle vertical connecting plate, and the horizontal coil spring is clamped between the two opposite second bosses.

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