A vertical seismic isolation device with adjustable stiffness

Abstract

This invention discloses an adjustable stiffness vertical vibration isolation device, comprising: a base plate, which is horizontally arranged; a steel keel, which is arranged above the base plate, and a guide rail is fixed to the bottom of the steel keel; an upper plate, which is horizontally arranged and fixed to the top of the steel keel; a spring support groove, one end of which is connected to the base plate, and the other end is slidably connected to the guide rail through a lower slider, and a spring fixing member is provided at the end of the spring support groove connected to the base plate, and a spring hanging ring is provided at the other end of the spring support groove; a support spring, which is arranged in the spring support groove, one end of which is connected to the spring fixing member, and the other end of which is connected to the spring hanging ring; and a guide device, which is arranged vertically, and the bottom of the guide device is fixedly connected to the base plate, the top of which is fixedly connected to the steel keel, and the top of the guide device abuts against the upper plate, thereby causing the upper plate to move vertically through the action of the guide device.

Description

Technical Field

[0001] This invention relates to the field of mechanical vibration isolation structure technology, specifically to a vertical vibration isolation device with adjustable stiffness. Background Technology

[0002] The propagation direction of earthquake motion can generally be decoupled into a horizontal direction parallel to the ground and a vertical direction perpendicular to the ground. During an earthquake, the ground motion is transmitted along the soil to buildings and then to important equipment or exhibited artworks, posing a risk of these items to topple or be damaged. Currently, the seismic isolation devices used for such valuable items focus on the horizontal direction, and the stiffness of these devices is difficult to adjust. They must be customized for each individual device, making mass production difficult.

[0003] Vertical seismic isolation devices must first ensure sufficient vertical load-bearing capacity to support the weight of the protected items, while simultaneously requiring low vertical stiffness to ensure a sufficiently long natural period for effective vertical isolation. These two requirements cannot be met using ordinary vertical spring components as the vertical stiffening element. This is because when the vertical stiffness is sufficiently low, the vertical deformation required for the vertical elastic component to bear the weight of the protected items is enormous, physically necessitating a very large vertical length, which is practically impossible to achieve. Summary of the Invention

[0004] The purpose of this invention is to provide a vertical seismic isolation device with adjustable stiffness to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides an adjustable stiffness vertical vibration isolation device, comprising: a base plate, which is horizontally arranged; a steel keel, which is arranged above the base plate, and a guide rail is fixed to the bottom of the steel keel; an upper plate, which is horizontally arranged and fixed to the top of the steel keel; a spring support groove, one end of which is connected to the base plate, and the other end of which is slidably connected to the guide rail via a lower slider, and a spring fixing member is provided at the end of the spring support groove connected to the base plate, and a spring hanging ring is provided at the other end of the spring support groove; a support spring, which is arranged in the spring support groove, one end of which is connected to the spring fixing member, and the other end of which is connected to the spring hanging ring; and a guide device, which is arranged vertically, and the bottom of the guide device is fixedly connected to the base plate, the upper part is fixedly connected to the steel keel, and the top of the guide device abuts against the upper plate, thereby causing the upper plate to move vertically through the action of the guide device.

[0006] In a preferred embodiment, the spring support groove further includes a first hinge, a support groove body, a lower slider support member, and a second hinge. The first hinge is disposed at the intersection of the spring support groove and the base plate and is fixed to the base plate. The support groove body is inclined and has a bent portion at the upper end. The lower slider support member is fixedly connected to the outer side of the bent portion. The top of the lower slider support member is connected to the lower slider through the second hinge.

[0007] In a preferred embodiment, the spring fixing member is arranged vertically and includes a fixing steel plate, a stiffening rib, a threaded groove, and a spring fixing nut. The stiffening rib is fixed to the base plate, the fixing steel plate has a threaded groove on its inner side, the spring fixing nut is disposed in the threaded groove, and the position of the spring fixing nut can be adjusted up and down to adjust the vertical stiffness of the device. One end of the supporting spring is connected to the spring fixing nut.

[0008] In a preferred embodiment, the lower slider includes a slider body and a third hinge, which is connected to a spring support groove.

[0009] In a preferred embodiment, the guide rail includes an upper slider, with a first limiting block and a second limiting block fixed at both ends of the bottom of the upper slider. The upper slider is fixed to a steel keel, and a lower slider is engaged with the upper slider. The lower slider and the upper slider can generate relative movement in the horizontal direction to isolate vertical ground vibration.

[0010] In a preferred embodiment, the guiding device includes two symmetrically arranged guide rods, each guide rod including an upper guide rod and a lower guide rod, the upper guide rod and the lower guide rod are sleeved together, and the upper guide rod can move up and down in the lower guide rod. The upper guide rod is fixed on the steel keel, and the lower guide rod is fixed on the base plate.

[0011] In a preferred embodiment, the upper guide rod has a flared structure, the lower guide rod has a constricted structure, and the movement distance of the upper guide rod in the lower guide rod meets the vertical displacement requirements of the device, so that the upper guide rod does not come out of the lower guide rod during movement.

[0012] In a preferred embodiment, four sets of spring support grooves, support springs, spring fixing members, lower sliders and guide rails are provided, each set constituting a vibration isolation unit. The four sets of vibration isolation units are arranged in parallel or in a ring-shaped arrangement.

[0013] In a preferred embodiment, when arranged in parallel, the first hinges at the intersection of adjacent spring support grooves and the base plate are alternately arranged on both sides of the base plate.

[0014] In a preferred embodiment, when each group is arranged in a ring with its ends connected, the adjacent spring support slots are arranged in a head-to-tail arrangement so that there are support points at all four corners of the device.

[0015] Compared with existing technologies, the beneficial effects of this invention are as follows: The core component of the adjustable stiffness vertical vibration isolation device of this invention is a support spring. When the upper self-weight load is applied, the device spring reaches the equilibrium position. The upper load is borne by the vertical resultant force of the support spring and the spring support groove. After vertical vibration occurs, the spring support groove makes a circular motion with the first hinge as the center and the distance from the first hinge to the spring hanging ring as the radius. Under the action of the guide device, the upper plate makes a vertical motion. The circular motion of the spring support groove and the vertical motion between the upper plate of the device are decoupled through the guide rail and the lower slider. The horizontal relative motion between the guide rail and the lower slider blocks the propagation of ground vibration. Therefore, this device can effectively reduce the vertical acceleration of items on the upper plate of the device, and play a good role in vertical vibration isolation. The stiffness of the vertical vibration isolation device is adjustable within a certain range, which has better adaptability to items of different weights and can realize mass production. Attached Figure Description

[0016] Figure 1 This is an elevation view of the vertical seismic isolation device of the present invention;

[0017] Figure 2 This is a schematic diagram showing the staggered arrangement of the isolation units in the vertical isolation device of the present invention;

[0018] Figure 3 This is a schematic diagram of the vertical seismic isolation device of the present invention with the seismic isolation units connected end to end;

[0019] Figure 4 This is a schematic diagram of the spring support groove of the present invention;

[0020] Figure 5 This is a schematic diagram of the structure of the spring fixing component of the present invention;

[0021] Figure 6 This is a schematic diagram of the lower slider of the present invention;

[0022] Figure 7 This is a schematic diagram of the upper slider of the present invention;

[0023] Figure 8 This is a schematic diagram of the guiding device of the present invention;

[0024] Figure 9 This is a schematic diagram illustrating the working mechanism of the vertical vibration isolation device of the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1-Base plate, 2-Top plate, 3-Steel keel, 4-Spring support groove, 41-Spring hanging ring, 42-First hinge, 43-Support groove body, 44-Lower slider support, 45-Second hinge, 5-Support spring, 6-Spring fixing part, 61-Fixing steel plate, 62-Reinforcing rib, 63-Threaded groove, 64-Spring fixing nut, 7-Lower slider, 71-Slider body, 72-Third hinge, 8-Guide rail, 81-Upper slider, 82-First limiting block, 83-Second limiting block, 9-Guiding device, 91-Upper guide rod, 92-Lower guide rod. Detailed Implementation

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below. All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0028] Example 1

[0029] like Figure 1-9 As shown, the adjustable stiffness vertical vibration isolation device of the preferred embodiment of the present invention includes: a base plate 1, an upper plate 2, a steel keel 3, a spring support groove 4, a support spring 5, a spring fixing member 6, a lower slider 7, a guide rail 8, and a guiding device. The spring support groove 4, the support spring 5, the spring fixing member 6, the lower slider 7, and the guide rail 8 are combined to form the main force-bearing body. The base plate 1 is a steel plate, and the upper plate 2 can be made of wood.

[0030] In this embodiment, four sets of spring support grooves 4, steel keel 3, support springs 5, spring fixing parts 6, lower sliders 7, and guide rails 8 are correspondingly arranged, each set constituting a vibration isolation unit. The four sets of vibration isolation units are arranged in parallel or in a ring-shaped arrangement. The base plate 1 is horizontally set, the steel keel 3 is set above the base plate 1, and the bottom of the steel keel 3 is fixed with guide rails 8. The upper plate 2 is horizontally set and fixed to the top of the steel keel 3. One end of the spring support groove 4 is connected to the base plate 1, and the other end is slidably connected to the guide rail 8 through the lower slider 7. The end of the spring support groove 4 connected to the base plate 1 is provided with a spring fixing part 6, and the other end of the spring support groove 4 is provided with a spring hanging ring 41. The support spring 5 is set in the spring support groove 4, one end of the support spring 5 is connected to the spring fixing part 6, and the other end is connected to the spring hanging ring 41. When the vertical vibration isolation device is running, after the upper self-weight is applied, the support spring 5 reaches the equilibrium position, and the upper load is borne by the vertical resultant force of the support spring 5 and the spring support groove 4. The guide device 9 is set vertically, and its bottom is fixedly connected to the base plate 1, its top is fixedly connected to the steel keel 3, and its top abuts against the upper plate 2. The upper plate 2 moves vertically through the action of the guide device 9.

[0031] Furthermore, the spring support groove 4 also includes a first hinge 42, a support groove body 43, a lower slider support member 44, and a second hinge 45. The first hinge 42 is located at the intersection of the spring support groove 4 and the base plate 1 and is fixed to the base plate 1. The support groove body 43 is inclined and has a bent part at the upper end. The lower slider support member 44 is fixedly connected to the outer side of the bent part. The top of the lower slider support member 44 is connected to the lower slider 7 through the second hinge 45.

[0032] Furthermore, the spring fixing member 6 is arranged vertically. The spring fixing member 6 includes a fixing steel plate 61, a stiffening rib 62, a threaded groove 63, and a spring fixing nut 64. The stiffening rib 62 is fixed on the base plate 1. The fixing steel plate 61 has a threaded groove 63 on its inner side. The spring fixing nut 64 is arranged in the threaded groove 63, and the position of the spring fixing nut 64 can be adjusted up and down to adjust the vertical stiffness of the device. One end of the supporting spring 5 is connected to the spring fixing nut 64.

[0033] Furthermore, the lower slider 7 includes a slider body 71 and a third hinge 72, which is connected to the spring support groove 4.

[0034] Furthermore, the guide rail 8 includes an upper slider 81, with a first limiting block 82 and a second limiting block 83 fixed at both ends of the bottom of the upper slider 81. The upper slider 81 is fixed on the steel keel 3, and the lower slider 7 is engaged on the upper slider 81. The lower slider 7 and the upper slider 81 can generate relative movement in the horizontal direction to isolate vertical ground motion and achieve the function of blocking earthquake propagation.

[0035] Furthermore, the guide device 9 includes two symmetrically arranged guide rods. Each guide rod includes an upper guide rod 91 and a lower guide rod 92. The upper guide rod 91 and the lower guide rod 92 are sleeved together, and the upper guide rod 91 can move up and down in the lower guide rod 92. The upper guide rod 91 is fixed on the upper part of the device and fixed on the steel keel 3, and the lower guide rod 92 is fixed on the base plate 1.

[0036] Furthermore, the upper guide rod 91 has a flared structure, and the lower guide rod 92 has a constricted structure. It is necessary to ensure that the distance the upper guide rod 91 moves in the lower guide rod 92 meets the vertical displacement requirements of the device, so that the upper guide rod 91 does not come out of the lower guide rod 92 during the movement.

[0037] Example 2

[0038] In this embodiment, as Figure 2As shown, when the four sets of seismic isolation units are arranged in parallel, the first hinge 42 at the intersection of the adjacent spring support groove 4 and the base plate 1 is alternately arranged on both sides of the base plate 1 to prevent eccentricity on one side. Four sets of guide devices 9 are provided, symmetrically arranged. Two sets of guide devices 9 are symmetrically arranged along a straight line between two adjacent sets of seismic isolation units, and the other two sets of guide devices 9 are symmetrically arranged along a straight line between two other adjacent sets of seismic isolation units.

[0039] Example 3

[0040] In this embodiment, as Figure 3 As shown, when the four sets of seismic isolation units are arranged in a ring-shaped arrangement, the adjacent spring support grooves 4 are arranged end-to-end to ensure that there are support points at all four corners of the device. Four sets of guide devices 9 are provided, which are symmetrically arranged and located at the inner center of the four sets of seismic isolation units.

[0041] Example 4

[0042] like Figure 9 As shown, when the vertical vibration isolation device is working, after the upper self-weight load is applied, the support spring reaches the equilibrium position, and the upper load is borne by the vertical resultant force of the support spring 5 and the spring support groove 4. After vertical vibration occurs, the spring support groove 4 makes a circular motion with the first hinge 42 as the center and the distance from the first hinge 42 to the spring hanging ring 41 as the radius. Under the action of the guide device 9, the upper plate 2 of the device makes a vertical movement. The circular motion of the spring support groove 4 and the vertical motion between the upper plate 2 of the device are decoupled through the guide rail 8 and the lower slider 7. The horizontal relative motion between the guide rail 8 and the lower slider 7 blocks the transmission of ground vibration. Therefore, through this device, the vertical acceleration of the items on the upper plate 2 of the device can be effectively reduced, and the vertical vibration isolation function can be achieved. When items of different masses are placed on the upper part of the device, and it is necessary to adjust the vertical stiffness of the device, the position of the spring fixing nut 64 can be adjusted to change the vertical stiffness. Figure 9 The distance between the lower support point A (i.e., the connection point between the first hinge 42 and the base plate) and the spring fixing point B is achieved.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stiffness-adjustable vertical seismic isolation device, characterized by: include: Base plate (1), which is horizontally arranged; A steel keel (3) is set above the base plate (1), and a guide rail (8) is fixed to the bottom of the steel keel (3). The upper plate (2) is horizontally set and fixed to the top of the steel keel (3); Spring support groove (4), one end of the spring support groove (4) is connected to the base plate (1), and the other end is slidably connected to the guide rail (8) through the lower slider (7). A spring fixing member (6) is provided at one end of the spring support groove (4) connected to the base plate (1), and a spring hanging ring (41) is provided at the other end of the spring support groove (4). A support spring (5) is provided in the spring support groove (4). One end of the support spring (5) is connected to the spring fixing member (6), and the other end is connected to the spring hanging ring (41). The guide device (9) is set in the vertical direction, and the bottom of the guide device (9) is fixedly connected to the base plate (1), the top is fixedly connected to the steel keel (3), and the top of the guide device (9) abuts against the upper plate (2). The upper plate (2) moves vertically through the action of the guide device (9). The spring support groove (4) further includes a first hinge (42), a support groove body (43), a lower slider support member (44), and a second hinge (45). The first hinge (42) is located at the intersection of the spring support groove (4) and the base plate (1) and is fixed on the base plate (1). The support groove body (43) is inclined and has a bent part at the upper end. The lower slider support member (44) is fixedly connected to the outer side of the bent part. The top of the lower slider support member (44) is connected to the lower slider (7) through the second hinge (45). The spring fixing member (6) is arranged in the vertical direction. The spring fixing member (6) includes a fixing steel plate (61), a stiffening rib (62), a threaded groove (63) and a spring fixing nut (64). The stiffening rib (62) is fixed on the base plate (1). The fixing steel plate (61) has a threaded groove (63) on its inner side. The spring fixing nut (64) is arranged in the threaded groove (63) and the setting position of the spring fixing nut (64) can be adjusted up and down to adjust the vertical stiffness of the device. One end of the supporting spring (5) is connected to the spring fixing nut (64). The guide rail (8) includes an upper slider (81), with a first limiting block (82) and a second limiting block (83) fixed at both ends of the bottom of the upper slider (81). The upper slider (81) is fixed on the steel keel (3), and the lower slider (7) is mounted on the upper slider (81). The lower slider (7) and the upper slider (81) can generate relative movement in the horizontal direction. When vertical vibration occurs, the spring support groove (4) moves in a circle with the first hinge (42) as the center and the distance from the first hinge (42) to the spring hanging ring (41) as the radius. Under the action of the guide device, the upper plate (2) moves vertically. The circular motion of the spring support groove (4) and the vertical motion between the upper plate (2) are decoupled through the guide rail (8) and the lower slider (7). The guide rail (8) and the lower slider (7) generate a horizontal relative motion to block the propagation of the ground vibration.

2. The adjustable-stiffness vertical seismic isolation device of claim 1, wherein: The lower slider (7) includes a slider body (71) and a third hinge (72), which is connected to the spring support groove (4).

3. The adjustable-stiffness vertical seismic isolation device of claim 2, wherein: The guiding device (9) includes two symmetrically arranged guide rods. Each guide rod includes an upper guide rod (91) and a lower guide rod (92). The upper guide rod (91) and the lower guide rod (92) are connected in a sleeve. The upper guide rod (91) can move up and down in the lower guide rod (92). The upper guide rod (91) is fixed on the steel keel (3), and the lower guide rod (92) is fixed on the base plate (1).

4. The adjustable-stiffness vertical seismic isolation device of claim 3, wherein: The upper guide rod (91) has a flared structure, and the lower guide rod (92) has a constricted structure. The movement distance of the upper guide rod (91) in the lower guide rod (92) meets the vertical displacement requirements of the device, so that the upper guide rod (91) does not come out of the lower guide rod (92) during the movement.

5. The vertical seismic isolation device with adjustable stiffness according to claim 4, characterized in that: The spring support groove (4), support spring (5), spring fixing piece (6), lower slider (7) and guide rail (8) are provided in four sets, each set forming a vibration isolation unit. The four sets of vibration isolation units are arranged in parallel or in a ring-shaped arrangement.

6. The vertical seismic isolation device with adjustable stiffness according to claim 5, characterized in that: When the four sets of seismic isolation units are arranged in parallel, the first hinge (42) at the intersection of the adjacent spring support groove (4) and the base plate (1) is alternately arranged on both sides of the base plate (1).

7. The vertical seismic isolation device with adjustable stiffness according to claim 5, characterized in that: When the four sets of seismic isolation units are arranged in a ring-shaped arrangement, the adjacent spring support grooves (4) are arranged in a ring-shaped arrangement so that there are support points at all four corners of the device.

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