A hexagonal geometric amplified magnetic levitation low-frequency vibration isolation structure

Abstract

The present invention belongs to the field of mechanical vibration control. The purpose is to provide a hexagonal geometric amplified magnetic levitation low-frequency vibration isolation structure, which can achieve quasi-zero stiffness characteristics and realize low-frequency vibration isolation. The technical solution is: a hexagonal geometric amplified magnetic levitation low-frequency vibration isolation structure, characterized in that it includes a lower base plate for connecting external mechanical equipment, an upper base plate arranged above the lower base plate at a spacing distance to withstand vibration, a magnetic levitation mechanism fixed on the lower base plate, and a hexagonal mechanism movably connected between the upper base plate and the lower base plate.

Description

Technical Field

[0001] The invention belongs to the field of mechanical vibration control, in particular to a hexagonal geometric amplified magnetic suspension low-frequency vibration isolation structure. Background Art

[0002] Vibration is a "bottleneck" problem in the aerospace and other national defense military industries. With the improvement of space mission functionality, spacecraft tend to be larger and lighter in structure, resulting in increasingly serious problems such as low-frequency vibration response and modal density. The large low-frequency vibration caused by it leads to poor service reliability of equipment and components, prone to failure, and seriously affects the pointing accuracy of space structures, reduces work quality, and shortens service life. Therefore, low-frequency and broadband vibration isolation structures with good vibration isolation performance have always been the focus of research in this field.

[0003] Traditional linear vibration isolation systems can effectively isolate medium and high frequency vibrations, but the stiffness needs to be reduced to meet the needs of vibration isolation bandwidth, which also leads to problems such as insufficient static support capacity of the vibration isolation system and increased displacement response. In recent years, nonlinear vibration isolators that obtain low-frequency vibration isolation performance by introducing negative stiffness mechanisms have become a research hotspot for many scholars. Nonlinear vibration isolators can use nonlinear stiffness or nonlinear damping to improve vibration isolation performance to overcome the defect that traditional linear vibration isolators cannot simultaneously take into account low-frequency broadband vibration isolation and load-bearing capacity. Among them, nonlinear stiffness can reduce dynamic stiffness to widen the isolation zone to achieve low-frequency vibration isolation. Based on this, a structure can be designed to improve the vibration isolation bandwidth and performance by regulating nonlinear stiffness. Summary of the invention

[0004] The purpose of the present invention is to solve the deficiencies described in the above background technology and to provide a hexagonal geometric amplified magnetic suspension low-frequency vibration isolation structure, which can achieve quasi-zero stiffness characteristics and realize low-frequency vibration isolation.

[0005] The technical solution provided by the present invention is:

[0006] A hexagonal geometric amplified magnetic levitation low-frequency vibration isolation structure, characterized in that it includes a lower base plate for connecting to external mechanical equipment, an upper base plate arranged above the lower base plate at a spacing distance to withstand vibration, a magnetic levitation mechanism fixed on the lower base plate, and a hexagonal mechanism movably connected between the upper base plate and the lower base plate.

[0007] The magnetic suspension mechanism comprises a lower fixing seat fixed on the lower bottom plate, a first magnet assembly fixed on the lower fixing seat, and two groups of second magnet assemblies fixed on the lower bottom plate and symmetrically arranged on the left and right sides of the first magnet assembly respectively;

[0008] The hexagonal mechanism includes an upper fixed seat fixed to the bottom surface of the upper base plate, two groups of connecting rod assemblies hinged between the upper fixed seat and the lower fixed seat, and springs at both ends respectively connecting the two groups of connecting rod assemblies; the two groups of connecting rod assemblies have the same structure and are symmetrically arranged on the left and right; a third magnet assembly is arranged in each group of connecting rod assemblies, and each group of third magnet assemblies is located between the first magnet assembly and the second magnet assembly on the same side.

[0009] The first magnet assembly includes two first magnets fixed on the left and right sides of the lower fixing seat; the two first magnets are respectively arranged at corresponding distances from the second magnet assembly on the same side.

[0010] The second magnet assembly includes a side fixing seat fixed on the lower base plate, a coil shell fixed on the side fixing seat, a second magnet installed in the coil shell and fixedly connected to the side fixing seat, and a closed coil wound around the outer circumference of the coil shell.

[0011] The two groups of connecting rod assemblies are combined to form a hexagonal structure; each group of connecting rod assemblies includes a first connecting rod, a third magnet assembly and a second connecting rod hinged in sequence; the other end of the first connecting rod is hinged on the upper fixed seat; the other end of the second connecting rod is hinged on the lower fixed seat.

[0012] The first connecting rod and the second connecting rod are equal in length.

[0013] The third magnet assembly comprises a magnet housing whose two ends are respectively hinged to the first connecting rod and the second connecting rod, a third magnet fixedly installed in the magnet housing, and a housing cover fixedly connected to the magnet housing and covering the third magnet.

[0014] The two ends of the spring are respectively fixedly connected to the upper parts of two magnet housings in the two groups of connecting rod assemblies.

[0015] In each group of connecting rod assemblies, two first connecting rods and two second connecting rods are provided and are symmetrically arranged front to back; and two groups of springs are provided and are symmetrically arranged front to back.

[0016] The third magnet has the same magnetic pole as the first magnet; the third magnet has the same magnetic pole as the second magnet, so that the third magnet maintains a magnetic suspension state under the repulsive force of the first magnet and the second magnet.

[0017] The center lines of the first magnet and the second magnet are coaxially arranged.

[0018] The beneficial effects of the present invention are:

[0019] 1. In the present invention, in the initial state, the third magnet maintains balance and is in a magnetic suspension state under the repulsive force of the first magnet and the second magnet on both sides; when the upper base plate is vibrated, the position of the third magnet is moved through the connecting rod assembly, so that a relative movement is generated between the closed coil and the third magnet, causing a change in the magnetic flux passing through the closed coil, and then generating an induced current in the closed coil. The induced current causes the coil to be subjected to an Ampere force opposite to the direction of movement, so as to hinder the relative movement of the third magnet and the closed coil, thereby damping the position change of the third magnet, suppressing vibration, and achieving vibration isolation.

[0020] 2. The present invention introduces magnetic levitation characteristics, and based on the nonlinear characteristics of magnetic force, the motion law of the suspended magnet in the magnetic field is regulated by geometric nonlinearity, so that the nonlinear stiffness can be regulated, thereby improving the vibration isolation bandwidth and performance.

[0021] 3. The structure uses the nonlinear positive stiffness between magnets to compensate for the negative stiffness, thereby achieving quasi-zero stiffness vibration isolation.

[0022] 4. In each connecting rod assembly of the present invention, two first connecting rods and two second connecting rods are provided and are symmetrically arranged front to back, and two groups of springs are also provided and are symmetrically arranged front to back, which can greatly improve the stability and vibration bearing capacity of the overall structure.

[0023] 5. The invention has a simple and compact structure, is safe and reliable, and is suitable for popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0025] Figure 2 It is a front structural schematic diagram of the present invention.

[0026] Figure 3 It is a three-dimensional structural schematic diagram of the magnetic levitation mechanism.

[0027] Figure 4 It is a schematic diagram of the exploded structure of the second magnet assembly.

[0028] Figure 5 It is a three-dimensional structural diagram of a hexagonal mechanism.

[0029] Figure 6 It is a front view structural diagram of the hexagonal mechanism.

[0030] Figure 7 It is a schematic diagram of the exploded structure of the third magnet assembly.

[0031] Figure 8 This is one of the state structure schematic diagrams of the present invention during the vibration process (the third magnet moves upward during the vibration process).

[0032] Fig. 9 This is the second schematic diagram of the state structure of the present invention during the vibration process (the third magnet is in the initial equilibrium position during the vibration process).

[0033] Fig.10 This is the third schematic diagram of the state structure of the present invention during the vibration process (the third magnet moves downward during the vibration process).

[0034] Reference numerals:

[0035] 1. Lower base plate;

[0036] 2. Upper base plate;

[0037] 3. Magnetic suspension mechanism; 3-1. Lower fixing seat; 3-2. First magnet assembly; 3-2-1. First magnet; 3-3. Second magnet assembly; 3-3-1. Side fixing seat; 3-3-2. Coil shell; 3-3-3. Second magnet; 3-3-4. Closed coil; 3-3-5. Gasket;

[0038] 4. Hexagonal mechanism; 4-1. Upper fixed seat; 4-2. First connecting rod; 4-3. Third magnet assembly; 4-3-1. Magnet housing; 4-3-2. Third magnet; 4-3-3. Housing cover; 4-3-4. Positioning pin; 4-4. Second connecting rod; 4-5. Spring. DETAILED DESCRIPTION

[0039] The following is a further description with reference to the embodiments shown in the accompanying drawings.

[0040] like Figure 1 , Figure 2 The hexagonal geometric amplified magnetic suspension low-frequency vibration isolation structure shown includes a lower base plate 1, an upper base plate 2, a magnetic suspension mechanism 3 and a hexagonal mechanism 4. The lower base plate is used to connect an external mechanical device (not shown in the figure); the upper base plate is set above the lower base plate at a spacing distance to withstand vibration.

[0041] like Figure 3 As shown, the magnetic suspension mechanism is fixed on the lower base plate; the magnetic suspension mechanism includes a lower fixing seat 3-1, a first magnet assembly 3-2 and two groups of second magnet assemblies 3-3. The lower fixing seat is fixed on the lower base plate. The first magnet assembly is fixed on the lower fixing seat; specifically, the first magnet assembly includes two first magnets 3-2-1, and the two first magnets are fixed on the left and right sides of the lower fixing seat by bolts.

[0042] The two sets of second magnet components are fixed on the lower base plate and are symmetrically arranged on the left and right sides of the first magnet component, wherein the two first magnets are arranged at corresponding distances from the second magnet components on the same side. Figure 4As shown, the second magnet assembly includes a side fixing seat 3-3-1, a coil shell 3-3-2, a second magnet 3-3-3 and a closed coil 3-3-4. The side fixing seat is fixed on the lower base plate; the coil shell is fixed on the side fixing seat; the second magnet is installed in the coil shell and fixedly connected to the side fixing seat by bolts (a gasket 3-3-5 is filled between the bolts and the second magnet); the closed coil is wound around the outer periphery of the coil shell. Preferably, the center lines of the first magnet and the second magnet are coaxially arranged.

[0043] like Figure 5 , Figure 6 As shown, the hexagonal mechanism is movably connected between the upper base plate and the lower base plate; the hexagonal mechanism includes an upper fixed seat 4-1, two groups of connecting rod assemblies and a spring 4-5. The upper fixed seat is fixed to the bottom surface of the upper base plate; the two groups of connecting rod assemblies are hinged between the upper fixed seat and the lower fixed seat; the two groups of connecting rod assemblies have the same structure and are arranged symmetrically, so that the two groups of connecting rod assemblies form a similar hexagonal structure after being combined.

[0044] Specifically, each group of connecting rod assemblies includes a first connecting rod 4-2, a third magnet assembly 4-3, and a second connecting rod 4-4, which are hinged in sequence; wherein each group of third magnet assemblies is located between the first magnet assembly and the second magnet assembly on the same side. The other end of the first connecting rod is hinged on the upper fixing seat; the other end of the second connecting rod is hinged on the lower fixing seat. In this embodiment, the first connecting rod and the second connecting rod are equal in length.

[0045] like Figure 7 As shown, the third magnet assembly includes a magnet housing 4-3-1, a third magnet 4-3-2 and a housing cover 4-3-3. The two ends of the magnet housing are hinged to the first connecting rod and the second connecting rod respectively. The third magnet is fixedly installed in the magnet housing, wherein the third magnet has the same magnetic pole as the first magnet, and the third magnet has the same magnetic pole as the second magnet, so as to ensure that the third magnet maintains a magnetic suspension state under the repulsive force of the first magnet and the second magnet respectively. The housing cover is fixedly connected to the magnet housing through a positioning pin 4-3-4 so as to cover the third magnet.

[0046] The two ends of the spring are respectively fixedly connected to the upper parts of the two magnet housings in the two groups of connecting rod assemblies. In order to improve the vibration bearing capacity of the hexagonal mechanism, in each group of connecting rod assemblies, two first connecting rods and two second connecting rods are provided and are symmetrically arranged front and back; the springs are also provided in two groups and are symmetrically arranged front and back.

[0047] The working principle of the present invention is as follows:

[0048] In the initial state, the lower base plate is fixed to the mechanical equipment, the upper base plate is connected to the vibration source, and the two third magnets maintain a magnetic suspension state under the repulsive force of the corresponding first magnet and second magnet.

[0049] When vibration occurs, the upper base plate moves up and down, driving the hexagonal structure to deform, causing the position of the third magnet to change (specifically, it moves obliquely upward or downward, see Figures 8 to 10 ). Due to the relative movement between the closed coil and the third magnet, the magnetic flux passing through the closed coil will change, thereby generating an induced current in the closed coil. According to Lenz's law, the induced current causes the coil to be subjected to an Ampere force in the opposite direction of the movement to hinder the relative movement between the third magnet and the closed coil, thereby damping the position change of the third magnet, suppressing vibration, and achieving vibration isolation.

[0050] Finally, it should be noted that the above examples are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and many variations are possible. All variations that can be directly derived or associated with the content disclosed by a person skilled in the art should be considered as the protection scope of the present invention.

Claims

1. A hexagonal geometric amplified magnetic suspension low-frequency vibration isolation structure, characterized in that: It comprises a lower base plate (1) for connecting to external mechanical equipment, an upper base plate (2) arranged above the lower base plate at a distance to withstand vibration, a magnetic suspension mechanism (3) fixed to the lower base plate, and a hexagonal mechanism (4) movably connected between the upper base plate and the lower base plate; The magnetic suspension mechanism comprises a lower fixing seat (3-1) fixed on the lower base plate, a first magnet assembly (3-2) fixed on the lower fixing seat, and two groups of second magnet assemblies (3-3) fixed on the lower base plate and symmetrically arranged on the left and right sides of the first magnet assembly; The hexagonal mechanism comprises an upper fixing seat (4-1) fixed to the bottom surface of the upper base plate, two groups of connecting rod assemblies hinged between the upper fixing seat and the lower fixing seat, and springs (4-5) at both ends of which are respectively connected to the two groups of connecting rod assemblies; the two groups of connecting rod assemblies have the same structure and are arranged symmetrically on the left and right; each group of connecting rod assemblies is provided with a third magnet assembly, and each group of third magnet assemblies is located between the first magnet assembly and the second magnet assembly on the same side; The first magnet assembly comprises two first magnets (3-2-1) fixed on the left and right sides of the lower fixing seat; the two first magnets are respectively arranged at corresponding distances from the second magnet assembly on the same side; The second magnet assembly comprises a side fixing seat (3-3-1) fixed on the lower base plate, a coil shell (3-3-2) fixed on the side fixing seat, a second magnet (3-3-3) installed in the coil shell and fixedly connected to the side fixing seat, and a closed coil (3-3-4) wound around the outer circumference of the coil shell; The two groups of connecting rod assemblies are combined to form a hexagonal structure; each group of connecting rod assemblies comprises a first connecting rod (4-2), a third magnet assembly (4-3) and a second connecting rod (4-4) which are hinged in sequence; the other end of the first connecting rod is hinged on an upper fixed seat; the other end of the second connecting rod is hinged on a lower fixed seat; The first connecting rod and the second connecting rod are equal in length; The third magnet assembly comprises a magnet housing (4-3-1) whose two ends are respectively hinged to the first connecting rod and the second connecting rod, a third magnet (4-3-2) fixedly installed in the magnet housing, and a housing cover (4-3-3) fixedly connected to the magnet housing and covering the third magnet; The two ends of the spring are respectively fixedly connected to the upper parts of the two magnet housings in the two groups of connecting rod assemblies; When vibration occurs, the upper base plate moves up and down, causing the hexagonal mechanism to deform and causing the position of the third magnet to change. Due to the relative movement between the closed coil and the third magnet, the magnetic flux passing through the closed coil will change, thereby generating an induced current in the closed coil. According to Lenz's law, the induced current causes the closed coil to be subjected to an Ampere force in the opposite direction of the movement to hinder the relative movement between the third magnet and the closed coil, thereby damping the position change of the third magnet, suppressing vibration, and achieving vibration isolation.

2. The hexagonal geometric amplified magnetic suspension low-frequency vibration isolation structure according to claim 1 is characterized in that: In each group of connecting rod assemblies, two first connecting rods and two second connecting rods are provided and are symmetrically arranged front to back; and two groups of springs are provided and are symmetrically arranged front to back.

3. The hexagonal geometric amplified magnetic suspension low-frequency vibration isolation structure according to claim 2 is characterized in that: The third magnet has the same magnetic pole as the first magnet; the third magnet has the same magnetic pole as the second magnet, so that the third magnet maintains a magnetic suspension state under the repulsive force of the first magnet and the second magnet.

4. The hexagonal geometric amplified magnetic suspension low-frequency vibration isolation structure according to claim 3 is characterized in that: The center lines of the first magnet and the second magnet are coaxially arranged.

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