Multi-directional vibration isolator with scissor-type structure

Abstract

The utility model provides a multidirectional vibration isolator of a scissor-type structure, and belongs to the technical field of vibration isolators, and the multidirectional vibration isolator is characterized in that a supporting platform and a bearing platform are connected through a positive stiffness mechanism and a negative stiffness mechanism, and the positive stiffness mechanism and the negative stiffness mechanism serve as connecting and supporting structures between the supporting platform and the bearing platform at the same time; in a load state, after vibration is generated, the bearing platform generates vibration displacement, then the positive stiffness mechanism, the first elastic piece, the negative stiffness mechanism of the scissor fork type structure and the second elastic piece are driven to generate relative displacement, positive stiffness and negative stiffness are provided for the device, generated restoring forces jointly act in a coupling mode, the dynamic stiffness of the whole device is reduced, and the device obtains high static stiffness; through the interaction of the positive stiffness mechanism and the negative stiffness mechanism of the shear fork type structure, the vibration isolation device has effective vibration isolation performance and balance stability, the device has low dynamic stiffness while having high static stiffness, the device can better adapt to the complex engineering operation environment, and the effective vibration isolation effect is achieved.

Description

Technical Field

[0001] This application belongs to the technical field of vibration isolators, and particularly relates to a scissor structure multi-directional vibration isolator. Background Art

[0002] Vibration is a common problem in production and life. Vibration in engineering can affect the accuracy of equipment, damage the service life of instruments, and also have some adverse effects on the human body. Therefore, it is of great significance to use vibration isolators to suppress vibration in production and life. The vibration isolation performance of existing vibration isolation vibration isolators is still poor and difficult to meet the actual use requirements. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0004] In view of this, according to an embodiment of the present application, a scissor structure multi-directional vibration isolator is proposed, including:

[0005] A support platform;

[0006] A bearing platform, the bearing platform is arranged parallel to the support platform;

[0007] A positive stiffness mechanism, the positive stiffness mechanism includes a first elastic member, the first end of the positive stiffness mechanism is rotatably connected to the support platform, and the second end of the positive stiffness mechanism is rotatably connected to the bearing platform, so that the bearing platform and the support platform are elastically connected;

[0008] A negative stiffness mechanism, the negative stiffness mechanism includes a second elastic member, the first side of the negative stiffness mechanism is connected to the support platform, and the second side of the negative stiffness mechanism is connected to the bearing platform, so that the bearing platform and the support platform are elastically connected.

[0009] In a feasible implementation manner, the first elastic member provides positive stiffness between the support platform and the bearing platform; the second elastic member provides negative stiffness between the support platform and the bearing platform.

[0010] In a feasible implementation manner, there are a total of four positive stiffness mechanisms, and the positive stiffness mechanisms are symmetrically arranged between the support platform and the bearing platform;

[0011] The positive stiffness mechanism includes:

[0012] A first rotating rod, the first end of the first rotating rod is rotatably connected to the support platform through a hinge shaft;

[0013] A second rotating rod, the first end of the second rotating rod is rotatably connected to the bearing platform through a hinge shaft, and the second end of the second rotating rod is rotatably connected to the second end of the first rotating rod through a hinge shaft;

[0014] The first elastic member is sleeved on the hinge shaft between the first rotating rod and the second rotating rod. The first end of the first elastic member is connected to the first rotating rod, and the second end of the first elastic member is connected to the second rotating rod.

[0015] In a feasible implementation manner, the scissor - type structure vibration isolator further includes:

[0016] A third elastic member, which is sleeved on the hinge shaft between the first rotating rod and the support platform. The first end of the third elastic member is connected to the support platform, and the second end of the third elastic member is connected to the first rotating rod;

[0017] A fourth elastic member, which is sleeved on the hinge shaft between the second rotating rod and the bearing platform. The first end of the fourth elastic member is connected to the bearing platform, and the second end of the fourth elastic member is connected to the second rotating rod.

[0018] In a feasible implementation manner, the first elastic member is a torsion spring; the third elastic member is a torsion spring; the fourth elastic member is a torsion spring.

[0019] In a feasible implementation manner, there are two negative - stiffness mechanisms, and the two negative - stiffness mechanisms are symmetrically arranged on the support platform; the negative - stiffness mechanism is a scissor structure, and the negative - stiffness mechanism includes a plurality of scissor units, and adjacent two scissor units are rotationally connected through a hinge shaft;

[0020] The scissor unit includes a first connecting rod, a second connecting rod, two third connecting rods and two fourth connecting rods. The first connecting rod and the second connecting rod are cross - arranged and are rotationally connected through a hinge shaft; the two third connecting rods are rotationally connected to both ends of the first connecting rod through two hinge shafts, and the two fourth connecting rods are rotationally connected to both ends of the second connecting rod through two hinge shafts, and the third connecting rod and the fourth connecting rod are rotationally connected through a hinge shaft to form two deformable diamond - shaped structures; a second elastic member is arranged between the first connecting rod and the second connecting rod.

[0021] In a feasible implementation manner, the scissor - type structure vibration isolator further includes:

[0022] A first connecting rod, which is vertically arranged on the support platform. The two first connecting rods are respectively arranged at the two ends of the negative - stiffness mechanism, and the hinge shaft between the third connecting rod and the fourth connecting rod is connected to the first connecting rod;

[0023] A second connecting rod, which is vertically arranged on the bearing platform. The second connecting rod is arranged at the middle of the negative - stiffness mechanism, and the hinge shaft between adjacent two scissor units is connected to the second connecting rod.

[0024] In a feasible implementation manner, the first connecting rod is connected to the support platform by fastening.

[0025] In a feasible implementation, two first connecting rods are symmetrically arranged on the support platform;

[0026] Two second elastic members are symmetrically arranged on both sides of the second connecting rod; the first end of the second elastic member is connected to the hinge shaft between the first link and the third link, and the second end of the second elastic member is connected to the hinge shaft between the second link and the fourth link.

[0027] In a feasible implementation, the second elastic member is a linear spring.

[0028] For the scissor structure multi-directional vibration isolator of the present application, compared with the prior art, the beneficial effects are as follows:

[0029] The scissor structure vibration isolator provided by the embodiment of the present application includes a support platform, a load platform, a positive stiffness mechanism, and a negative stiffness mechanism. The support platform is fixed on the vibrating device, and the item to be vibration-isolated is fixed on the load platform. The support platform and the load platform are connected by the positive stiffness mechanism and the negative stiffness mechanism. The positive stiffness mechanism and the negative stiffness mechanism simultaneously serve as the connection and support structure between the support platform and the load platform; in the loaded state, after vibration occurs, the load platform generates a vibration displacement, which in turn drives the positive stiffness mechanism, the first elastic member, the negative stiffness mechanism of the scissor structure, and the second elastic member to have relative displacements, and simultaneously provides positive stiffness and negative stiffness to the device. The generated restoring forces act together in a coupled manner to reduce the dynamic stiffness of the entire device and enable the device to obtain a high static stiffness; the scissor structure has effective vibration isolation performance. By rotatably connecting the positive stiffness mechanism with the support platform and the load platform, the positive stiffness mechanism can move flexibly, reducing the transmission of vibration. Then, through the cooperation and interaction of the positive stiffness mechanism and the negative stiffness mechanism of the scissor structure, the vibration isolation device has effective vibration isolation performance and balance stability in multiple directions, enabling the device to have a low dynamic stiffness while having a high static stiffness, and being able to better adapt to complex engineering working environments and achieve effective vibration isolation effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0031] Figure 1 It is a schematic structural diagram of a scissor structure vibration isolator according to an embodiment provided by the present application from a first angle;

[0032] Figure 2 It is a schematic structural diagram of a scissor structure vibration isolator according to an embodiment provided by the present application from a second angle;

[0033] Figure 3 Schematic structural diagram of a scissor - type vibration isolator according to an embodiment of the present application from a third angle;

[0034] Figure 4 Schematic structural diagram of the positive - stiffness mechanism of a scissor - type vibration isolator according to an embodiment of the present application;

[0035] Figure 5 Schematic structural diagram of the negative - stiffness mechanism of a scissor - type vibration isolator according to an embodiment of the present application;

[0036] Figure 6 Force - displacement curve of the positive - stiffness mechanism, negative - stiffness mechanism, and scissor - type vibration isolator according to an embodiment of the present application;

[0037] Among them, Figures 1 to 5 The corresponding relationship between the reference numerals and the component names in

[0038] 11, support platform; 12, bearing platform; 13, positive - stiffness mechanism; 14, negative - stiffness mechanism; 15, first elastic member; 16, second elastic member; 17, third elastic member; 18, fourth elastic member; 19, first connecting rod; 20, second connecting rod;

[0039] 131, first rotating rod; 132, second rotating rod;

[0040] 14a, scissor unit;

[0041] 141, first connecting rod; 142, second connecting rod; 143, third connecting rod; 144, fourth connecting rod. Detailed implementation manners

[0042] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0043] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more unless specifically and explicitly defined otherwise.

[0044] In this application, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] The preferred embodiments of this application will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining this application and are not used to limit this application.

[0046] As Figures 1 to 3 shown, according to an embodiment of this application, a scissor structure multi-directional vibration isolator is proposed, including: a support platform 11, a load platform 12, a positive stiffness mechanism 13, and a negative stiffness mechanism 14; the load platform 12 is arranged parallel to the support platform 11; the positive stiffness mechanism 13 includes a first elastic member 15, the first end of the positive stiffness mechanism 13 is rotatably connected to the support platform 11, and the second end of the positive stiffness mechanism 13 is rotatably connected to the load platform 12, so that the load platform 12 is elastically connected to the support platform 11; the negative stiffness mechanism 14 is a scissor structure, the negative stiffness mechanism 14 includes a second elastic member 16, the first side of the negative stiffness mechanism 14 is connected to the support platform 11, and the second side of the negative stiffness mechanism 14 is connected to the load platform 12, so that the load platform 12 is elastically connected to the support platform 11.

[0047] The scissor - type vibration isolator provided by the embodiment of the present application includes a support platform 11, a load - bearing platform 12, a positive - stiffness mechanism 13, and a negative - stiffness mechanism 14. The support platform 11 is fixed on the vibrating equipment, and the item to be vibration - isolated is fixed on the load platform. The support platform 11 and the load - bearing platform 12 are connected by the positive - stiffness mechanism 13 and the negative - stiffness mechanism 14. The positive - stiffness mechanism 13 and the negative - stiffness mechanism 14 simultaneously serve as the connection and support structure between the support platform 11 and the load - bearing platform 12. Under the load state, after vibration occurs, the load - bearing platform 12 generates a vibration displacement, which in turn drives the positive - stiffness mechanism 13, the first elastic member 15, the negative - stiffness mechanism 14 of the scissor - type structure, and the second elastic member 16 to have relative displacements. At the same time, positive stiffness and negative stiffness are provided to the device, and the generated restoring forces act together in a coupled manner to reduce the dynamic stiffness of the entire device and enable the device to obtain a high static stiffness. The scissor - type structure has effective vibration - isolation performance. By rotatably connecting the positive - stiffness mechanism 13 with the support platform 11 and the load - bearing platform 12, the positive - stiffness mechanism 13 can move flexibly, reducing the transmission of vibration. Then, through the cooperation and interaction between the positive - stiffness mechanism 13 and the negative - stiffness mechanism 14 of the scissor - type structure, the vibration - isolation device has effective vibration - isolation performance and balance stability in multiple directions. While having a high static stiffness, the device has a low dynamic stiffness, can better adapt to complex engineering operation environments, and achieve an effective vibration - isolation effect.

[0048] Furthermore, the positive - stiffness mechanism 13 is elastically connected to the support platform 11 and elastically connected to the load - bearing platform 12. At the same time, the positive - stiffness mechanism 13 can rotate relative to the support platform 11 and the load - bearing platform 12 to achieve vibration suppression in multiple directions, enabling the vibration isolator to achieve effective vibration isolation in multiple directions.

[0049] In a feasible implementation manner, the first elastic member 15 provides positive stiffness between the support platform 11 and the load - bearing platform 12; the second elastic member 16 provides negative stiffness between the support platform 11 and the load - bearing platform 12.

[0050] In this technical solution, the first elastic member 15 provides the positive stiffness of the positive - stiffness mechanism 13 between the support platform 11 and the load - bearing platform 12; the second elastic member 16 provides the negative stiffness of the negative - stiffness mechanism 14 of the scissor - type structure between the support platform 11 and the load - bearing platform 12, enabling the device to obtain the characteristic of low dynamic stiffness. Through the combined action of the restoring forces generated by the first elastic member 15 and the second elastic member 16, the device has the characteristics of both low dynamic stiffness and high static stiffness.

[0051] As Figure 1 and Figure 4 shown, in a feasible implementation manner, there are a total of four positive - stiffness mechanisms 13, and the positive - stiffness mechanisms 13 are symmetrically arranged between the support platform 11 and the load - bearing platform 12;

[0052] The positive stiffness mechanism 13 includes: a first rotating rod 131 and a second rotating rod 132; the first end of the first rotating rod 131 is rotatably connected to the support platform 11 through a hinge shaft; the first end of the second rotating rod 132 is rotatably connected to the bearing platform 12 through a hinge shaft, and the second end of the second rotating rod 132 is rotatably connected to the second end of the first rotating rod 131 through a hinge shaft; a first elastic member 15 is sleeved on the hinge shaft between the first rotating rod 131 and the second rotating rod 132, the first end of the first elastic member 15 is connected to the first rotating rod 131, and the second end of the first elastic member 15 is connected to the second rotating rod 132.

[0053] In this technical solution, there are four positive stiffness mechanisms 13 in total. The positive stiffness mechanisms 13 are symmetrically arranged between the support platform 11 and the bearing platform 12 to evenly share the acting force between the support platform 11 and the bearing platform 12 and improve the overall stability of the device; the positive stiffness mechanism 13 includes a first rotating rod 131 and a second rotating rod 132. The first rotating rod 131 is rotatably connected to the support platform 11, the second rotating rod 132 is rotatably connected to the bearing platform 12, and at the same time, the second rotating rod 132 is rotatably connected to the first rotating rod 131. The first elastic member 15 elastically connects the first rotating rod 131 and the second rotating rod 132; when the bearing platform 12 bears a heavy object, the bearing platform 12 displaces in the direction close to the support platform 11, causing the first rotating rod 131 and the second rotating rod 132 to rotate, and further deforming the first elastic member 15 to generate a restoring force, providing positive stiffness to the device and making the positive stiffness mechanism 13 in a supporting balance state to stably support the bearing platform 12.

[0054] Furthermore, relief notches are provided at the four corners of the support platform 11 and the bearing platform 12 to facilitate the installation and connection of the support platform 11 and the bearing platform 12 with the positive stiffness mechanism 13.

[0055] As Figures 1 to 4 shown, in a feasible implementation manner, the scissor-type vibration isolator further includes: a third elastic member 17 and a fourth elastic member 18; the third elastic member 17 is sleeved on the hinge shaft between the first rotating rod 131 and the support platform 11, the first end of the third elastic member 17 is connected to the support platform 11, and the second end of the third elastic member 17 is connected to the first rotating rod 131; the fourth elastic member 18 is sleeved on the hinge shaft between the second rotating rod 132 and the bearing platform 12, the first end of the fourth elastic member 18 is connected to the bearing platform 12, and the second end of the fourth elastic member 18 is connected to the second rotating rod 132.

[0056] In this technical solution, the first rotating rod 131 is elastically connected to the support platform 11 through the third elastic member 17, and the second rotating rod 132 is elastically connected to the support platform 11 through the fourth elastic member 18. Thus, the positive stiffness mechanism 13 is elastically connected to both the support platform 11 and the load-bearing platform 12. Under the load state, through the deformation of the third elastic member 17 and the fourth elastic member 18 in cooperation with the deformation of the first elastic member 15 and the second elastic member 16, the vibration isolation performance of the device is improved, and the vibration suppression range is increased. By the rotation of the first rotating rod 131 relative to the support platform 11 and the rotation of the second rotating rod 132 relative to the load-bearing platform 12, the degree of freedom of the device is further improved, enabling the device to flexibly suppress vibrations in multiple directions and achieve the vibration isolation effect in multiple directions.

[0057] In this technical solution, under the load state, the first elastic member 15, the third elastic member 17, and the fourth elastic member 18 deform to generate restoring forces, providing positive stiffness to the device. The second elastic member 16 deforms to provide negative stiffness to the device. The restoring forces generated by the first elastic member 15, the second elastic member 16, the third elastic member 17, and the fourth elastic member 18 act together through coupling, making the dynamic stiffness of the entire device infinitely close to zero, that is, quasi-zero stiffness, forming a quasi-zero stiffness effect range, and achieving vibration suppression in multiple directions.

[0058] In a feasible implementation manner, the first elastic member 15 is a torsion spring; the third elastic member 17 is a torsion spring; the fourth elastic member 18 is a torsion spring.

[0059] In this technical solution, the elastic member at the rotational connection of the first rotating rod 131 and the second rotating rod 132 is a torsion spring. The torsion spring has a certain pre-compression amount to balance the static load of the items placed on the load-bearing platform 12, so as to obtain higher static stiffness. At the same time, the torsion spring can store and release a large torque in a smaller space, enabling the structure of the device to be more compact and contributing to reducing the overall volume of the device.

[0060] Such as Figure 1 and Figure 5As shown, in a feasible embodiment, there are two negative stiffness mechanisms 14 in total, and the two negative stiffness mechanisms 14 are symmetrically arranged on the support platform 11; the negative stiffness mechanism 14 is a scissor structure, and the negative stiffness mechanism 14 includes a plurality of scissor units 14a, and two adjacent scissor units 14a are rotationally connected by a hinge shaft; the scissor unit 14a includes a first link 141, a second link 142, two third links 143 and two fourth links 144, the first link 141 and the second link 142 are cross - arranged, and the first link 141 and the second link 142 are rotationally connected by a hinge shaft; the two third links 143 are rotationally connected to both ends of the first link 141 through two hinge shafts, the two fourth links 144 are rotationally connected to both ends of the second link 142 through two hinge shafts, and the third link 143 and the fourth link 144 are rotationally connected by a hinge shaft to form two deformable rhombus structures; the second elastic member 16 is arranged between the first link 141 and the second link 142.

[0061] In this technical solution, the first link 141, the second link 142, the two third links 143 and the two fourth links 144 form two deformable rhombus structures in a scissor unit 14a. By rotationally connecting adjacent scissor units 14a, a scissor structure with multiple rhombus structures is formed; by arranging the second elastic member 16 between the first link 141 and the second link 142 of the rhombus structure, when the load - bearing platform 12 bears a heavy object and the load - bearing platform 12 displaces in the direction close to the support platform 11, the second elastic member 16 deforms and generates a restoring force, providing negative stiffness to the device. Coupled with the restoring forces generated by the first elastic member 15, the third elastic member 17 and the fourth elastic member 18, the dynamic stiffness of the entire device is zero, that is, quasi - zero stiffness, so as to achieve multi - direction vibration suppression in the vertical direction, horizontal direction and rotational direction.

[0062] It can be understood that by disassembling and assembling the elastic members to apply different constraints, flexible conversion between single - freedom, two - degree - of - freedom and three - degree - of - freedom can be achieved.

[0063] It can be understood that the use of multiple sets of vibration isolation devices can enable the system to obtain more degrees of freedom, be flexible in use, and enable the system to have more ideal and effective multi - direction vibration isolation performance.

[0064] Such as Figure 1 、 Figure 2 and Figure 5As shown, in a feasible implementation, the scissor structure vibration isolator further includes: a first connecting rod 19 and a second connecting rod 20; the first connecting rod 19 is vertically arranged on the support platform 11, and the two first connecting rods 19 are respectively arranged at the two ends of the negative stiffness mechanism 14, and the hinge shaft between the third connecting rod 143 and the fourth connecting rod 144 is connected to the first connecting rod 19; the second connecting rod 20 is vertically arranged on the load-bearing platform 12, the second connecting rod 20 is arranged in the middle of the negative stiffness mechanism 14, and the hinge shaft between two adjacent scissor units 14a is connected to the second connecting rod 20.

[0065] In this technical solution, one side of the negative stiffness mechanism 14 is connected to the support platform 11 through the first connecting rod 19, and the other side of the negative stiffness mechanism 14 is connected to the load-bearing platform 12 through the second connecting rod 20; the first connecting rod 19 and the second connecting rod 20 are vertically arranged between the support platform 11 and the load-bearing platform 12. Under the load state, the displacement of the load-bearing platform 12 directly acts on the negative stiffness mechanism 14 through the vertically arranged second connecting rod 20, enabling the negative stiffness mechanism 14 and the second elastic member 16 to respond quickly and in a timely manner, deform, and generate a restoring force; both the first connecting rod 19 and the second connecting rod 20 are connected to the hinge shafts of the scissor units 14a to ensure the flexibility of the scissor units 14a, thereby ensuring that the second elastic member 16 can deform in a timely manner and generate a restoring force.

[0066] As Figure 1 shown, in a feasible implementation, the first connecting rod 19 is connected to the support platform 11 by fastening.

[0067] In this technical solution, the first connecting rod 19 is detachably connected to the support platform 11 by fastening. By adjusting the distance between the first connecting rods 19 at both ends of the negative stiffness mechanism 14, the vibration isolation performance of the negative stiffness mechanism 14 can be adjusted. By adjusting the geometric parameters of the structure, the characteristics of the device can be flexibly adjusted, realizing the adjustment of the vibration isolation performance of the device and the vibration suppression effect under different direction excitations, making the overall parameter adjustment of the device convenient, flexible, and efficient.

[0068] In some examples, both the first connecting rod 19 and the second connecting rod 20 are of T-shaped structures. Two threaded holes are symmetrically opened at the head of the T-shaped structure to facilitate the detachable connection of the first connecting rod 19 to the support platform 11 and the detachable connection of the second connecting rod 20 to the load-bearing platform 12. A through hole is opened at the tail of the T-shaped structure to facilitate the hinge installation of the first connecting rod 19, the second connecting rod 20 and the negative stiffness mechanism 14.

[0069] As Figure 2 and Figure 5As shown, in a feasible implementation, two first connecting rods 19 are symmetrically arranged on the support platform 11; two second elastic members 16 are symmetrically arranged on both sides of the second connecting rod 20; the first end of the second elastic member 16 is connected to the hinge shaft between the first link 141 and the third link 143, and the second end of the second elastic member 16 is connected to the hinge shaft between the second link 142 and the fourth link 144.

[0070] In this technical solution, two first connecting rods 19 are symmetrically arranged on the support platform 11, and the first connecting rod 19 is connected to the end of the negative stiffness mechanism 14, and the second connecting rod 20 is connected to the middle of the negative stiffness mechanism 14. By symmetrically arranging two second elastic members 16 on both sides of the second connecting rod 20, the two second elastic members 16 are located at the symmetric positions of the negative stiffness mechanism 14, improving the consistency of the deformation of the two second elastic members 16 and the uniformity of the force on the negative stiffness mechanism 14 and the second elastic members 16, which helps the flatness of the bearing platform 12 and the support platform 11 under the load state; the first connecting rod 19, the second connecting rod 20 and the second elastic member 16 are all connected to the hinge shaft of the negative stiffness mechanism 14 to avoid interfering with the rotation of the link of the negative stiffness mechanism 14, ensuring the timeliness of the deformation of the negative stiffness mechanism 14 and the second elastic member 16, so that the second elastic member 16 can deform in time and generate a restoring force.

[0071] In a feasible implementation, the second elastic member 16 is a linear spring.

[0072] In this technical solution, using a linear spring as the second elastic member 16 can reduce the stiffness of the negative stiffness mechanism 14 and broaden the vibration isolation frequency band; under the load state, through the cooperation of the second elastic member 16 with the first elastic member 15, the third elastic member 17 and the fourth elastic member 18, that is, the cooperation of the linear spring and three torsion springs, the dynamic stiffness of the whole system is zero, that is, quasi-zero stiffness, so as to realize the vibration suppression in the vertical direction, the horizontal direction and the rotational direction. Thus, while the device realizes effective vibration isolation, it also has a wide vibration suppression range, improving the practicability of the device.

[0073] Embodiment:

[0074] When the device is in use, the support platform 11 is fixed to the vibrating device by bolt connection, and the vibration isolation object is fixed to the bearing platform 12; when vibration occurs, the vibration isolation load generates a vibration displacement, which in turn drives the scissor unit 14a of the negative stiffness mechanism 14, the second elastic member 16, and the first elastic member 15, the third elastic member 17 and the fourth elastic member 18 in the positive stiffness mechanism 13 to have relative displacements, respectively providing negative stiffness and positive stiffness to the device, and the generated restoring forces act together in a coupled manner, making the dynamic stiffness of the whole device zero, that is, quasi-zero stiffness, so as to realize the vibration suppression in the vertical direction, the horizontal direction and the rotational direction.

[0075] When the device is in the initial installation state, the included angle between the first rotating rod 131 and the second rotating rod 132 in the positive stiffness mechanism 13 is α; as the device is loaded, the bearing platform 12 moves towards the direction close to the support platform 11, and the included angle α between the first rotating rod 131 and the second rotating rod 132 gradually decreases until the shear fork unit 14a at both ends of the negative stiffness mechanism 14 in the device is in a horizontal state, and the device has the most effective vibration isolation performance; at this time, the first elastic member 15, the third elastic member 17, and the fourth elastic member 18 have a certain pre-compression amount to balance the static load of the placed items, and the deformation of the second elastic member 16 provides negative stiffness for the device to form a quasi-zero stiffness effect interval.

[0076] It is easy for those skilled in the art to understand that, on the premise of no conflict, the above advantageous ways can be freely combined and superimposed.

[0077] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only the preferred implementation manner of the present application. It should be noted that for those of ordinary skill in the art in the technical field of the present application, without departing from the technical principle of the present application, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present application.

Claims

1. A scissor-type multi-directional vibration isolator, characterized in that: The scissor-type structural vibration isolator comprises: Support platform; A load-bearing platform, the load-bearing platform is arranged parallel to the supporting platform; A positive stiffness mechanism, the positive stiffness mechanism comprising a first elastic member, a first end of the positive stiffness mechanism being rotatably connected to the support platform, and a second end of the positive stiffness mechanism being rotatably connected to the bearing platform, so that the bearing platform is elastically connected to the support platform; A negative stiffness mechanism, wherein the negative stiffness mechanism comprises a second elastic member, wherein a first side of the negative stiffness mechanism is connected to the supporting platform, and a second side of the negative stiffness mechanism is connected to the bearing platform, so that the bearing platform is elastically connected to the supporting platform.

2. A scissor-type multi-directional vibration isolator according to claim 1, characterized in that: The first elastic member provides positive stiffness between the support platform and the load-bearing platform; The second elastic member provides negative stiffness between the supporting platform and the carrying platform.

3. A scissor-type multi-directional vibration isolator according to claim 2, characterized in that: There are four positive stiffness mechanisms in total, and the positive stiffness mechanisms are symmetrically arranged between the support platform and the load-bearing platform; The positive stiffness mechanism comprises: A first rotating rod, wherein a first end of the first rotating rod is rotatably connected to the supporting platform via a hinge shaft; A second rotating rod, wherein a first end of the second rotating rod is rotatably connected to the bearing platform via a hinge shaft, and a second end of the second rotating rod is rotatably connected to the second end of the first rotating rod via a hinge shaft; The first elastic member is sleeved on the hinge shaft between the first rotating rod and the second rotating rod. The first end of the first elastic member is connected to the first rotating rod, and the second end of the first elastic member is connected to the second rotating rod.

4. The scissor-type multi-directional vibration isolator according to claim 3, characterized in that: The scissor-type structural vibration isolator also includes: a third elastic member, wherein the third elastic member is sleeved on the hinge shaft between the first rotating rod and the supporting platform, wherein a first end of the third elastic member is connected to the supporting platform, and a second end of the third elastic member is connected to the first rotating rod; A fourth elastic member, wherein the fourth elastic member is sleeved on the hinge shaft between the second rotating rod and the bearing platform, the first end of the fourth elastic member is connected to the bearing platform, and the second end of the fourth elastic member is connected to the second rotating rod.

5. The scissor-type multi-directional vibration isolator according to claim 4, characterized in that: The first elastic member is a torsion spring; The third elastic member is a torsion spring; The fourth elastic member is a torsion spring.

6. The scissor-type multi-directional vibration isolator according to claim 2, characterized in that: There are two negative stiffness mechanisms, which are symmetrically arranged on the support platform; The negative stiffness mechanism is a scissor-fork structure, and the negative stiffness mechanism includes a plurality of scissor-fork units, and two adjacent scissor-fork units are rotatably connected through a hinge shaft; The scissor-type fork unit comprises a first link, a second link, two third links and two fourth links, the first link and the second link are cross-arranged, the first link and the second link are rotatably connected via a hinge shaft; the two third links are rotatably connected to the two ends of the first link via two hinge shafts, the two fourth links are rotatably connected to the two ends of the second link via two hinge shafts, and the third link and the fourth link are rotatably connected via the hinge shaft to form two deformable rhombus structures; The second elastic member is disposed between the first connecting rod and the second connecting rod.

7. The scissor-type multi-directional vibration isolator according to claim 6, characterized in that: The scissor-type structural vibration isolator also includes: A first connecting rod, wherein the first connecting rod is vertically arranged on the supporting platform, two ends of the negative stiffness mechanism are respectively arranged on the two first connecting rods, and a hinge shaft between the third connecting rod and the fourth connecting rod is connected to the first connecting rod; A second connecting rod, wherein the second connecting rod is vertically arranged on the bearing platform, the second connecting rod is arranged in the middle of the negative stiffness mechanism, and the hinge shaft between two adjacent scissor-fork units is connected to the second connecting rod.

8. The scissor-type multi-directional vibration isolator according to claim 7, characterized in that: The first connecting rod is connected to the supporting platform via a fastener.

9. The scissor-type multi-directional vibration isolator according to claim 7, characterized in that: The two first connecting rods are symmetrically arranged on the supporting platform; The two second elastic members are symmetrically arranged on both sides of the second connecting rod; the first end of the second elastic member is connected to the hinge shaft between the first connecting rod and the third connecting rod, and the second end of the second elastic member is connected to the hinge shaft between the second connecting rod and the fourth connecting rod.

10. A scissor-type multi-directional vibration isolator according to any one of claims 1 to 9, characterized in that: The second elastic member is a linear spring.

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