A horizontal vibration isolation device with adjustable stiffness

Abstract

This invention discloses a horizontal vibration isolation device with adjustable stiffness, comprising: a base plate; a middle plate, which is horizontally positioned above the base plate and forms a first vibration isolation layer with the base plate; an upper plate, which is horizontally positioned above the middle plate and forms a second vibration isolation layer with the middle plate; sliding tracks, a first set of sliding tracks symmetrically arranged on the left and right sides of the first vibration isolation layer, the upper and lower ends of the first set of sliding tracks being connected to the middle plate and the base plate respectively, a second set of sliding tracks symmetrically arranged on the front and rear sides of the second vibration isolation layer, the upper and lower ends of the second set of sliding tracks being fixedly connected to the upper plate and the middle plate respectively; spring fixing members, two sets of spring fixing members symmetrically arranged on the left and right sides of the upper surface of the base plate, and two sets of spring fixing members symmetrically arranged on the front and rear sides of the upper surface of the middle plate; and two spring connecting members, one of which is fixed to the middle plate and the other is fixed to the upper plate, with a supporting spring connecting each spring connecting member to each spring fixing member.

Description

Technical Field

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

[0002] Important equipment or exhibited artworks, such as cultural relics, are easily damaged by overturning or impact under earthquakes due to excessive acceleration or velocity, resulting in incalculable losses. Under earthquake action, ground motion is transmitted through the soil to buildings, then to storage cabinets, and finally to equipment or artworks, or even directly to them. Without proper protection, these items may face the risk of overturning and damage. After the ground motion is transmitted to the building, the main direction of the vibration is horizontal; therefore, developing horizontal seismic isolation devices is essential. Currently, the stiffness of most such seismic isolation devices is not adjustable, and the design of horizontal seismic isolation devices must be customized, resulting in extremely high costs. Summary of the Invention

[0003] The purpose of this invention is to provide a horizontal vibration isolation device with adjustable stiffness to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides a horizontally adjustable vibration isolation device comprising: a base plate, which is horizontally positioned; a middle plate, which is horizontally positioned above the base plate and forms a first vibration isolation layer with the base plate; an upper plate, which is horizontally positioned above the middle plate and forms a second vibration isolation layer with the middle plate; two sets of sliding tracks, wherein a first set of sliding tracks is symmetrically positioned on the left and right sides of the first vibration isolation layer, and the upper and lower ends of the first set of sliding tracks are respectively connected to the middle plate and the base plate; a second set of sliding tracks is symmetrically positioned on the front and rear sides of the second vibration isolation layer, and the upper and lower ends of the second set of sliding tracks are respectively fixedly connected to the upper plate and the middle plate; two spring fasteners, wherein two sets of spring fasteners are symmetrically positioned on the left and right sides of the upper surface of the base plate and two sets of spring fasteners are symmetrically positioned on the front and rear sides of the upper surface of the middle plate, and each set of spring fasteners comprises two spring fasteners; and two spring connectors, one of which is fixed to the middle plate and the other is fixed to the upper plate, wherein a supporting spring is connected between the spring connector and each spring fastener.

[0005] In a preferred embodiment, the sliding track includes an upper track and a lower track. The top of the lower track is provided with an arc-shaped groove along its length. The upper track is provided with an arc-shaped slider that matches the arc-shaped groove. The arc-shaped slider can move relative to the arc-shaped groove. The upper and lower tracks of the first set of sliding tracks are fixedly connected to the middle plate and the bottom plate, respectively. The upper and lower tracks of the second set of sliding tracks are fixedly connected to the upper plate and the middle plate, respectively.

[0006] In a preferred embodiment, the spring fastener includes a fastener body, a fastening bolt, a first fastening nut, a second fastening nut, and a spring hanging hole. The fastener body has a frame structure, and bolt holes are symmetrically opened on both sides of the fastener body. The fastening bolt is set in the bolt hole. The first fastening nut and the second fastening nut are respectively provided on the fastening bolt on both sides of the bolt hole on one side. The fastening bolt is provided with a first spring hanging hole. The position of the first spring hanging hole can be changed by adjusting the fastening bolt.

[0007] In a preferred embodiment, the spring connector includes two spring hangers arranged in a cross shape. Each spring hanger includes a fixing block and a second spring hanging hole. The fixing block of one spring hanger is fixed to the lower surface of the middle plate, and the fixing block of the other spring hanger is fixed to the lower surface of the upper plate, and are respectively located at the center of the middle plate and the upper plate.

[0008] In a preferred embodiment, each spring hanger has two second spring hanging holes at its bottom. The second spring hanging holes are integrally formed with the fixing block or fixed on the fixing block. One end of the supporting spring is connected to the second spring hanging hole, and the other end is connected to the first spring hanging hole.

[0009] In a preferred embodiment, the spring connector includes a lower energy-dissipating slider and an upper energy-dissipating slider. The lower energy-dissipating slider includes a first slider, with sliding rods fixed on both sides of the top of the first slider, forming a groove between the two sliding rods. A pair of first ear plates are provided at the bottom of the first slider, with pins passing through the first ear plates. The upper energy-dissipating slider includes a second slider, with the top of the second slider fixedly connected to the lower surface of the middle plate or the upper plate, respectively. Grooves matching the sliding rods are provided on both sides of the second slider, and the two sliding rods are respectively embedded in the two side grooves.

[0010] In a preferred embodiment, the system further includes a strut, which is positioned between two adjacent support springs on the same side of an acute angle. One end of the strut is connected to the lower energy-dissipating slider, and the other end is connected to the strut fixing member.

[0011] In a preferred embodiment, the strut includes a strut body, with a first strut ear plate and a second strut ear plate respectively provided at both ends of the strut body. A third strut ear plate is symmetrically provided on both sides of one end of the strut body located at the second strut ear plate. The lower energy-consuming slider is connected to the second strut ear plate through the first ear plate and fixed by a pin. One end of the support spring is connected to the third strut ear plate, and the other end is connected to the spring hanging hole.

[0012] In a preferred embodiment, the strut fixing component includes a strut fixing nut and a strut fixing screw. The strut fixing nut is fixed to the base plate or the middle plate. The first strut ear plate is placed on the strut fixing nut and fixedly connected by the fixing screw. The strut can perform circular motion around the center of the fixing screw.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention combines the supporting spring, the spring fixing member, and the spring connecting member to form the force-bearing body. In order to meet the decoupling of movement in two horizontal directions, the force-bearing body is stacked in two layers without interfering with each other. The two ends of the supporting spring are respectively fixed to the spring fixing member and the spring connecting member. In actual use, the horizontal stiffness can be adjusted by adjusting the position of the spring fixing member, thereby effectively reducing the horizontal acceleration of the upper part of the seismic isolation device under seismic action. Moreover, the stiffness of the horizontal seismic isolation device of the present invention is adjustable within a certain range, which has good adaptability to items of different masses and can realize mass production. Attached Figure Description

[0014] Figure 1 This is an elevation view of a horizontal seismic isolation device according to an embodiment of the present invention;

[0015] Figure 2 This is a schematic diagram of the planar arrangement of the first isolation layer according to an embodiment of the present invention;

[0016] Figure 3 This is a schematic diagram of the planar arrangement of the second isolation layer according to an embodiment of the present invention;

[0017] Figure 4 This is a schematic diagram of the structure of a sliding track according to an embodiment of the present invention;

[0018] Figure 5 This is a schematic diagram of the structure of a spring fixing member according to an embodiment of the present invention;

[0019] Figure 6 This is a schematic diagram of the structure of a spring hanger according to one embodiment of the present invention;

[0020] Figure 7 This is a schematic diagram illustrating the working principle of a vibration isolation device according to an embodiment of the present invention;

[0021] Figure 8 This is the horizontal stiffness curve of the vibration isolation device according to one embodiment of the present invention during operation;

[0022] Figure 9 This is an elevation view of a horizontal seismic isolation device according to another embodiment of the present invention;

[0023] Figure 10 This is a schematic diagram of the planar arrangement of the first isolation layer according to another embodiment of the present invention;

[0024] Figure 11 This is a schematic diagram of the planar arrangement of the second isolation layer according to another embodiment of the present invention;

[0025] Figure 12A This is a front view schematic diagram of the lower energy-consuming slider according to another embodiment of the present invention;

[0026] Figure 12B This is a right-side schematic diagram of the lower energy-consuming slider according to another embodiment of the present invention;

[0027] Figure 13 This is a schematic diagram of the upper energy-consuming slider according to another embodiment of the present invention;

[0028] Figure 14A This is a schematic diagram of the strut structure according to another embodiment of the present invention;

[0029] Figure 14B This is a top view schematic diagram of a strut according to another embodiment of the present invention;

[0030] Figure 15 This is a schematic diagram of the structure of a strut fixing member according to another embodiment of the present invention;

[0031] Figure 16 This is a schematic diagram illustrating the working principle of a vibration isolation device according to another embodiment of the present invention;

[0032] Figure 17 This is the horizontal stiffness curve of the vibration isolation device during operation according to another embodiment of the present invention. Detailed Implementation

[0033] 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.

[0034] Example 1

[0035] like Figure 1-6As shown, the adjustable-stiffness horizontal vibration isolation device of the preferred embodiment of the present invention includes: a base plate 1, a middle plate 2, an upper plate 3, a sliding track 4, a support spring 5, a spring fixing member 6, and a spring connecting member. The base plate 1 is horizontally arranged, and the middle plate 2 is horizontally arranged above the base plate 1, forming a first vibration isolation layer together with the base plate. The upper plate 3 is horizontally arranged above the middle plate 2, forming a second vibration isolation layer together with the middle plate 2. The first and second vibration isolation layers are stacked. Two sets of sliding tracks 4 are provided. The first set of sliding tracks 4 is symmetrically arranged on the left and right sides of the first vibration isolation layer, and the upper and lower ends of the first set of sliding tracks 4 are respectively connected to the middle plate 2 and the base plate 1, so that the middle plate 2 and the base plate 1 can move relative to each other along the first set of sliding tracks 4. The second set of sliding tracks 4 is symmetrically arranged on the front and rear sides of the second vibration isolation layer, and the upper and lower ends of the second set of sliding tracks 4 are fixedly connected to the upper plate 3 and the middle plate 2, so that the middle plate 2 and the upper plate 3 can move relative to each other along the second set of sliding tracks 4. Two sets of spring fixing members 6 are symmetrically arranged on the left and right sides of the upper surface of the base plate 1, and two sets of spring fixing members 6 are symmetrically arranged on the front and rear sides of the upper surface of the middle plate 2. Each set of spring fixing members 6 consists of two members, which are parallel to the sliding rail 4 and spaced apart on the inner side of the sliding rail 4. There are two spring connecting members, one of which is fixed to the middle plate 2 and the other is fixed to the upper plate 3. Each spring connecting member is connected to a support spring 5. The support spring 5, the spring fixing members 6, and the spring connecting members combine to form the main force-bearing body. To achieve decoupling of movement in the two horizontal directions, the main force-bearing body is stacked in two layers so that they do not interfere with each other.

[0036] Furthermore, the base plate 1, middle plate 2, and upper plate 3 are all made of steel plates. The area of ​​the middle plate 2 is smaller than that of the base plate 1, and the area of ​​the upper plate 3 is the same as that of the base plate 1. Preferably, the middle plate 2 has an octagonal structure, that is, four oblique sides are symmetrically arranged at the four corners of the base plate 1. The sliding track 4 includes an upper track 41 and a lower track 42. The top of the lower track 42 has an arc-shaped groove along its length. The upper track 41 is provided with an arc-shaped slider that matches the arc-shaped groove. The arc-shaped slider can move relative to the arc-shaped groove. The upper track 41 and lower track 42 of the first set of sliding tracks 4 are fixedly connected to the middle plate 2 and the base plate 1, respectively. The upper track 41 and lower track 42 of the second set of sliding tracks 4 are fixedly connected to the upper plate 3 and the middle plate 2, respectively.

[0037] Furthermore, the spring fixing component 6 includes a fixing component body 61, a fixing bolt 62, a first fastening nut 63, a second fastening nut 64, and a spring hanging hole 65. The fixing component body 61 has a frame structure, and bolt holes are symmetrically opened on both sides of the fixing component body 61. The fixing bolt 62 is set in the bolt hole. The first fastening nut 63 and the second fastening nut 64 are respectively set on the fixing bolt 62 on both sides of the bolt hole on one side. The fixing bolt 62 is provided with a first spring hanging hole 65. The position of the first spring hanging hole 65 can be changed by adjusting the fixing bolt 62.

[0038] In this embodiment, the spring connector includes two spring hangers 7 arranged in a cross shape. Each spring hanger 7 includes a fixing block 71 and a second spring hanging hole 72. The fixing block 71 of one spring hanger 7 is fixed on the lower surface of the middle plate 2, and the fixing block 71 of the other spring hanger 7 is fixed on the lower surface of the upper plate 3, and is located at the center of the middle plate 2 and the upper plate 3, respectively.

[0039] Furthermore, each spring hanger 7 has two second spring hanging holes 72 at its bottom. The second spring hanging holes 72 are integrally constructed with the fixing block 71 or fixed on the fixing block 71. One end of the supporting spring 5 is connected to the second spring hanging hole 72, and the other end is connected to the first spring hanging hole 65.

[0040] like Figure 7 As shown, when the device is not activated, the tensions of the four support springs 5 ​​are balanced. Once the device starts to move, the support springs 5 ​​generate horizontal resistance between the middle plate 2 or the upper plate 3, and relative movement occurs between the bottom plate 1 and the middle plate 2 or between the middle plate 2 and the upper plate 3, which can play a role in vibration isolation.

[0041] When different masses of items need to be placed on the upper part of the horizontal vibration isolation device with adjustable stiffness, or when the motion cycle needs to be adjusted, the position of the first spring hanging hole 65 can be changed by adjusting the position of the fixing bolt 62 in the spring fixing part 6, so as to adjust the stiffness of the device.

[0042] It should be noted that because the resistance generated by the spring in this device is not along the spring's axis, the horizontal stiffness of the device will change during movement, for example... Figure 8 This is the horizontal stiffness curve of the seismic isolation device during operation.

[0043] Example 2

[0044] Unlike Example 1, as Figure 9-15 As shown, the spring connector in this embodiment includes a lower energy-dissipating slider 8 and an upper energy-dissipating slider 9. The two upper energy-dissipating sliders 9 are fixed on the middle plate 2 and the upper plate 3 respectively, and are arranged perpendicularly to each other. The lower energy-dissipating slider 8 includes a first slider 81, with sliding rods 82 fixed on both sides of the top of the first slider 81. A groove is formed between the two sliding rods 82. A pair of first ear plates 83 are provided at the bottom of the first slider 81, and a pin 84 passes through the first ear plate 83. The upper energy-dissipating slider 9 includes a second slider 91. The top of the second slider 91 is fixedly connected to the lower surface of the middle plate 2 or the upper plate 3 respectively. The two sides of the second slider 91 are provided with grooves 92 that match the sliding rods 82. The two sliding rods 82 are respectively embedded in the two side grooves 92. The grooves 92 are arc-shaped grooves, and the sliding rods 82 are arc-shaped protrusions that match the grooves 92. Energy can be dissipated through sliding friction or by adding damping material.

[0045] Furthermore, the device also includes a support rod 10, which is disposed between two adjacent support springs 5 ​​on the same side with an acute angle. One end of the support rod 10 is connected to the lower energy-dissipating slider 8, and the other end is connected to the support rod fixing member 11.

[0046] Furthermore, the support rod 10 includes a support rod body 101. The two ends of the support rod body 101 are respectively provided with a first support rod ear plate 102 and a second support rod ear plate 103. The support rod body 101 is symmetrically provided with a third support rod ear plate 104 on both sides of one end of the second support rod ear plate 103. The lower energy-consuming slider 8 is connected to the second support rod ear plate 103 through the first ear plate 83 and fixed by the pin 84. One end of the support spring 5 is connected to the third support rod ear plate 104, and the other end is connected to the spring hanging hole 65.

[0047] Furthermore, the strut fixing component 11 includes a strut fixing nut 111 and a strut fixing screw 112. The strut fixing nut 111 is fixed on the base plate 1 or the middle plate 2. The first strut ear plate 102 is placed on the strut fixing nut 111 and fixedly connected by the fixing screw 112. During the movement, the strut 10 can make circular motion around the center of the fixing screw 112.

[0048] like Figure 16 As shown, when the device is not activated, the tension of the two support springs 5 ​​is balanced by the pressure of the strut 10. Once the device starts moving, a horizontal resistance is generated between the support springs 5 ​​and the strut 10, and relative movement occurs between the base plate 1 and the middle plate 2, or between the middle plate 2 and the upper plate 3, which can play a role in vibration isolation. One end of the strut 10 makes a circular motion around the strut fixing member 11, and the circular motion of one end of the strut 10 can be decoupled by the relative sliding of the lower energy dissipation slider 8 and the upper energy dissipation slider 9. During the movement of the horizontal vibration isolation device with adjustable stiffness, the lower energy dissipation slider 8 and the upper energy dissipation slider 9 between the base plate 1 and the middle plate 2, and between the middle plate 2 and the upper plate 3, are decoupled from each other, which can respectively play the role of isolating earthquakes in the corresponding directions.

[0049] When different masses of objects need to be placed on the upper part of the adjustable-stiffness horizontal vibration isolation device, or when adjusting the motion cycle, the relative distance between the fixing bolt 62 and the support rod fixing nut 111 can be changed by adjusting the position of the fixing bolt 62 in the spring fixing member 6, thereby adjusting the stiffness of the device. Adding the support rod 10 will result in a more stable horizontal stiffness for the horizontal vibration isolation device during motion, for example... Figure 17 The curve shows the horizontal stiffness of the seismic isolation device with this structure during motion.

[0050] 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 horizontal vibration isolation device, characterized by: The utility model relates to a kind of sliding rail and spring connection device for the first and second vibration isolation layer of building, including: Bottom plate (1), the bottom plate (1) is horizontally arranged; Middle plate (2) is horizontally arranged above the bottom plate (1), and forms first vibration isolation layer with the bottom plate; Upper plate (3) is horizontally arranged above the middle plate (2), and forms second vibration isolation layer with the middle plate (2); Sliding rail (4) is provided with two groups, first group sliding rail (4) is symmetrically arranged in the left and right sides of first vibration isolation layer, and the upper and lower ends of first group sliding rail (4) are respectively connected with middle plate (2) and bottom plate (1), second group sliding rail (4) is symmetrically arranged in the front and rear sides of second vibration isolation layer, and the upper and lower ends of second group sliding rail (4) are respectively fixedly connected with upper plate (3) and middle plate (2), the sliding rail (4) includes upper track (41) and lower track (42), the top of the lower track (42) is provided with arc-shaped sliding slot along the length direction, the upper track (41) is provided with arc-shaped sliding block matched with arc-shaped sliding slot, and the arc-shaped sliding block can relatively move along arc-shaped sliding slot; Spring fixing part (6), the bottom plate (1) upper surface left and right sides are symmetrically provided with two groups of spring fixing part (6), the middle plate (2) upper surface front and rear sides are symmetrically provided with two groups of spring fixing part (6), the number of each group of spring fixing part (6) is two, the spring fixing part (6) includes fixing part body (61), fixed bolt (62), first fastening nut (63), second fastening nut (64) and spring hanging hole (65), fixing part body (61) is frame structure, and the both sides of fixing part body (61) are symmetrically provided with bolt hole, fixed bolt (62) is arranged in bolt hole, and the fixed bolt (62) on the both sides of bolt hole at one side is respectively provided with first fastening nut (63) and second fastening nut (64), and first spring hanging hole (65) is arranged on fixed bolt (62), and the position of first spring hanging hole (65) can be changed by adjusting fixed bolt (62); Spring connecting piece, which is provided with two, one of which is fixed on the middle plate (2), and the other is fixed on the upper plate (3), and the spring connecting piece is connected with each spring fixing part (6) by support spring (5), the spring connecting piece includes two spring hanging pieces (7) arranged in cross structure, each spring hanging piece (7) includes fixed block (71) and second spring hanging hole (72), one of the spring hanging pieces (7) is fixed on the lower surface of the middle plate (2), and the other is fixed on the lower surface of the upper plate (3), and is respectively located in the center of the middle plate (2) and the upper plate (3), the bottom of each spring hanging piece (7) is provided with two second spring hanging holes (72), the second spring hanging hole (72) is an integral structure with the fixed block (71) or is fixed on the fixed block (71), one end of the support spring (5) is connected with the second spring hanging hole (72), and the other end is connected with the first spring hanging hole (65). Or the spring connecting piece comprises a lower energy dissipation sliding block (8), an upper energy dissipation sliding block (9) and a strut (10), the strut (10) is arranged between two adjacent support springs (5) located on the same side of an acute angle, one end of the strut (10) is connected with the lower energy dissipation sliding block (8), and the other end of the strut (10) is connected with a strut fixing piece (11); when the device is not started, the tension of the two support springs (5) is balanced with the pressure of the strut (10); when the device starts to move, horizontal resistance is generated between the support spring (5) and the strut (10), relative movement is generated between the bottom plate (1) and the middle plate (2) or between the middle plate (2) and the upper plate (3), one end of the strut (10) performs circular motion around the strut fixing piece (11), and the circular motion of one end of the strut (10) is decoupled through relative sliding of the lower energy dissipation sliding block (8) and the upper energy dissipation sliding block (9); in the movement process, the lower energy dissipation sliding block (8) and the upper energy dissipation sliding block (9) between the bottom plate (1) and the middle plate (2) and the lower energy dissipation sliding block (8) and the upper energy dissipation sliding block (9) between the middle plate (2) and the upper plate (3) are decoupled from each other, and respectively play a role of isolating earthquakes in corresponding directions.

2. The stiffness-adjustable horizontal vibration isolation device according to claim 1, characterized by: The upper rail (41) and the lower rail (42) of the first group of sliding rails (4) are fixedly connected with the middle plate (2) and the bottom plate (1) respectively, and the upper rail (41) and the lower rail (42) of the second group of sliding rails (4) are fixedly connected with the upper plate (3) and the middle plate (2) respectively.

3. The stiffness-adjustable horizontal vibration isolation device according to claim 2, characterized by: When the spring connecting piece comprises the lower energy dissipation sliding block (8), the upper energy dissipation sliding block (9) and the strut (10), the lower energy dissipation sliding block (8) comprises a first sliding block (81), two slide rods (82) are fixed on the top of the first sliding block (81) on both sides, a sliding groove is formed between the two slide rods (82), a pair of first ear plates (83) are arranged at the bottom of the first sliding block (81), a pin (84) is arranged in the first ear plate (83), the upper energy dissipation sliding block (9) comprises a second sliding block (91), the top of the second sliding block (91) is fixedly connected with the lower surface of the middle plate (2) or the upper plate (3), and sliding grooves (92) matched with the slide rods (82) are formed in the two sides of the second sliding block (91); the two slide rods (82) are respectively embedded in the two sliding grooves (92).

4. The stiffness-adjustable horizontal vibration isolation device according to claim 1, characterized by: When the spring connecting piece comprises the lower energy dissipation sliding block (8), the upper energy dissipation sliding block (9) and the strut (10), the strut (10) comprises a strut body (101), first and second strut ear plates (102) and (103) are arranged at the two ends of the strut body (101) respectively, third strut ear plates (104) are symmetrically arranged at the two sides of one end of the strut body (101) located at the second strut ear plate (103), the lower energy dissipation sliding block (8) is connected with the second strut ear plate (103) through the first ear plate (83) and is fixed through the pin (84), one end of the support spring (5) is connected with the third strut ear plate (104), and the other end of the support spring (5) is connected with the spring hanging hole (65).

5. The stiffness-adjustable horizontal vibration isolation device according to claim 4, characterized by: The support rod fixing member (11) comprises a support rod fixing member fixing nut (111) and a support rod fixing member screw rod (112), the support rod fixing member fixing nut (111) is fixed on the bottom plate (1) or the middle plate (2), the first support rod ear plate (102) is placed on the support rod fixing member fixing nut (111) and is fixedly connected through the fixing member screw rod (112).

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