A nonlinear vibration isolator containing electromagnetic damping and a crank rocker mechanism

Abstract

The nonlinear vibration isolator containing electromagnetic damping and crank rocker mechanism of the present application comprises a crank rocker, a base, a base rear cover, a first magnetic material and a second magnetic material; the first magnetic material and the second magnetic material are fixedly arranged on the base, are sleeved with the base and are embedded in a cavity of the base containing a rotor, and the base is screwed with the base rear cover. The vibration isolator can select the nonlinear form of stiffness and damping according to the working load, and the electromagnetic damping has no friction resistance, so that the vibration isolator has superior reliability and applicability.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of vibration isolation, and particularly relates to a nonlinear vibration isolator containing electromagnetic damping and a crank-rocker mechanism. BACKGROUND

[0002] The research on vibration isolation technology originates from the demand of ultra-precision manufacturing and measurement under extreme conditions, aerospace exploration, transportation, weapon equipment and other fields. These fields require devices that can work in low-frequency and ultra-low-frequency environments, while traditional linear vibration isolation systems often cannot meet the demand in these environments. Linear vibration isolation systems usually only have good suppression effect on vibrations in the medium and high frequency band range, but it is difficult to effectively isolate the micro-vibration in the low frequency region. At present, quasi-zero stiffness vibration isolators are mainly used for small amplitude vibration isolation, and there is still room for development in the field of large excitation. Most of the existing vibration isolation systems have single function, and the vibration mechanical energy is mostly dissipated and difficult to collect, and the signal collection and vibration isolation layout are not conducive to active adjustment. The new type of nonlinear electromagnetic vibration isolator can meet the higher requirements to a certain extent to maintain the normal operation of the machinery, increase the service life, and improve the safety and reliability of the engineering structure.

[0003] For the nonlinear electromagnetic vibration isolator, the source of magnetic force is mainly the permanent magnet, which generates damping through coupling with the coil. Compared with other structure types of vibration isolators, the electromagnetic damping force is a non-contact force, which has the advantage of energy conversion. In addition, active control or adjustment of damping can be achieved by connecting different circuits. The nonlinear electromagnetic vibration isolator can be combined with energy harvesting technology and control technology to produce better vibration isolation effect and has excellent expandability. SUMMARY

[0004] The application is a double-coil structure electromagnetic damping nonlinear vibration isolator, which realizes the following technical scheme:

[0005] The nonlinear vibration isolator containing electromagnetic damping and a crank-rocker mechanism comprises a crank-rocker, a base 8, a base rear cover 9, a first magnetic material 10, and a second magnetic material 26.

[0006] The first magnetic material 10 and the second magnetic material 26 are fixedly arranged on the base 8, are sleeved with the base 8, and are embedded in the cavity of the base 8 containing the rotor, and the base 8 is screwed with the base rear cover 9.

[0007] Preferably, the nonlinear vibration isolator further comprises a first longitudinal axis 1, a top cover 3, a second longitudinal axis 2, a third longitudinal axis 20, and a fourth longitudinal axis 21; the top cover 3 is limited in rotation and horizontal displacement by the first longitudinal axis 1, the second longitudinal axis 2, the third longitudinal axis 20, and the fourth longitudinal axis 21, and the top cover 3 is movable in the vertical direction; the first longitudinal axis 1, the second longitudinal axis 2, the third longitudinal axis 20, and the fourth longitudinal axis 21 are arranged on the base 8.

[0008] Preferably, the crank rocker mechanism comprises a rocker 6 and a crank 7, the rocker 6 is connected to the top cover 3 through a second component connecting shaft 25, the crank 7 is connected to the rotating shaft 15 through a key fit, and the rocker 6 is connected to the crank 7 through a first component connecting shaft 16; the first component connecting shaft 16 is in clearance fit with the rocker 6 and the crank 7 and is fixed by a second stopper 17.

[0009] Preferably, the second component connecting shaft 25 is in clearance fit with the rocker 6 and the top cover 3 and is fixed by a third stopper 24.

[0010] Preferably, the base 8 comprises a hollow cylindrical shell capable of accommodating a rotor, a cuboid bottom surface, and a bracket limiting the rotating shaft 15; a rotating shaft 15 is arranged on the bracket of the base 8, the bracket, the hollow cylindrical shell, and the bottom surface are integrated, and a rotor 11 is arranged in the hollow cylindrical shell.

[0011] Preferably, the rotor 11 is composed of a copper wire, a rotor bar, and a rotor core and is connected to the rotating shaft 15 through a key; the rotor 11 conducts current out through a first brush 22 and a second brush 23, and the first brush 22 and the second brush 23 are connected to an external circuit.

[0012] Preferably, the rotating shaft 15 is connected to a first stopper 12 through a first screw 13 and a second screw 14, the rotating shaft 15 is limited in translation by the first stopper 12, and the rotating shaft 15 is in clearance fit with the base 8.

[0013] Preferably, the first magnetic material 10 and the second magnetic material 26 are arranged with opposite magnetic poles to form an approximately uniform magnetic field.

[0014] Preferably, the nonlinear vibration isolator comprising an electromagnetic damping and a crank rocker mechanism further comprises a first spring 4, a second spring 5, a third spring 18, and a fourth spring 19 fixedly connected to the base 8 and the top cover 3, respectively.

[0015] The base 8 is a hollow cuboid with an open upper end and a plurality of holes arranged on the side surface.

[0016] Advantages

[0017] The nonlinear electromagnetic vibration isolator has the characteristics of damping nonlinearity, adjustable damping, and function conversion, solves the reliability problem of ordinary nonlinear vibration isolators under low-frequency large-amplitude vibration working conditions through the damping end, and thus makes the vibration isolator show good vibration isolation effect under low-frequency working conditions. In the structure of the nonlinear electromagnetic vibration isolator, the stiffness structure can adopt a simple linear stiffness structure, or a plurality of nonlinear stiffness structures, as long as these structures do not seriously affect the magnetic characteristics of the electromagnetic damper. The nonlinear damping structure can be connected in series and parallel with an RLC nonlinear circuit to adjust the circuit characteristics and thus produce different damping effects, and a plurality of settings can be adopted under specific working conditions, having the advantage of strong designability. The vibration isolator can select the nonlinear forms of stiffness and damping according to the working load, and the electromagnetic damping has no friction resistance, so that the vibration isolator has superior reliability and applicability. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a whole structure diagram of the first embodiment of the nonlinear electromagnetic vibration isolator of the present application.

[0019] Figure 2 It is a cross-sectional view of the first embodiment of the nonlinear electromagnetic vibration isolator of the present application.

[0020] Figure 3 It is a structure schematic diagram of the rotor part of the nonlinear electromagnetic vibration isolator of the present application.

[0021] Figure 4 It is a front view cross-sectional view of the nonlinear electromagnetic vibration isolator of the present application.

[0022] Figure 5 It is a base schematic diagram of the nonlinear electromagnetic vibration isolator of the present application.

[0023] Figure 6 It is a crank rocker mechanism connection schematic diagram of the nonlinear electromagnetic vibration isolator of the present application.

[0024] Figure 7 It is a rocker and rotating shaft connection diagram of the nonlinear electromagnetic vibration isolator of the present application.

[0025] Figure 8 It is a rear cross-sectional view of the rotating shaft of the nonlinear electromagnetic vibration isolator of the present application.

[0026] Figure 9 It is a crank and top connection diagram of the nonlinear electromagnetic vibration isolator of the present application.

[0027] Figure 10 It is a different vibration isolator transmissibility curve diagram.

[0028] Figure 11 It is a whole structure diagram of the second embodiment of the nonlinear electromagnetic vibration isolator of the present application.

[0029] The parts are numbered as follows:

[0030] First longitudinal axis 1, second longitudinal axis 2, top cover 3, first spring 4, second spring 5, rocker 6, crank 7, base 8, base back cover 9, first magnetic material 10, rotor 11, first baffle 12, first screw 13, second screw 14, rotating axis 15, first component connecting axis 16, second baffle 17, third spring 18, fourth spring 19, third longitudinal axis 20, fourth longitudinal axis 21, first brush 22, second brush 23, third baffle 24, second component connecting axis 25, second magnetic material 26. DETAILED DESCRIPTION

[0031] The following is combined with Figures 1 to 11 The nonlinear electromagnetic vibration isolator of the present invention is further described in detail.

[0032] like Figure 1 、 Figure 2 As shown, a nonlinear electromagnetic vibration isolator with electromagnetic damping of the present invention includes a first longitudinal axis 1, a second longitudinal axis 2, a top cover 3, a first spring 4, a second spring 5, a rocker 6, a crank 7, a base 8, a base back cover 9, a first magnetic material 10, a rotor 11, a first baffle 12, a first screw 13, a second screw 14, a rotating axis 15, a first component connecting axis 16, a second baffle 17, a third spring 18, a fourth spring 19, a third longitudinal axis 20, a fourth longitudinal axis 21, a first brush 22, a second brush 23, a third baffle 24, a second component connecting axis 25, and a second magnetic material 26;

[0033] The first longitudinal axis 1, the second longitudinal axis 2, the third longitudinal axis 20, and the fourth longitudinal axis 21 are disposed on the base 8. The first magnetic material 10 and the second magnetic material 26 are fixedly disposed on the base 8, are sleeved with the base 8, and are embedded in the cavity of the base 8 containing the rotor. The base 8 is screwed together with the base back cover 9.

[0034] The top cover 3 is restricted in rotation and horizontal displacement by the first longitudinal axis 1, the second longitudinal axis 2, the third longitudinal axis 20, and the fourth longitudinal axis 21. The top cover 3 moves in the vertical direction. The longitudinal axes include four identical first longitudinal axis 1, second longitudinal axis 2, third longitudinal axis 20, and fourth longitudinal axis 21.

[0035] The crank rocker includes a rocker 6 and a crank 7. The rocker 6 is connected to the top cover 3 via a second connecting shaft 25. The crank 7 is keyed to the rotating shaft 15. The rocker 6 and the crank 7 are connected via a first connecting shaft 16. The first connecting shaft 16 is loosely fitted with the rocker 6 and the crank 7 and is secured with a second stopper 17.

[0036] The second component connecting shaft 25 is in clearance fit with the rocker 6 and the top cover 3, and is fixed by the third blocking piece 24. The base 8 comprises a hollow cylindrical shell that can accommodate the rotor, a cuboid bottom surface, and a bracket that limits the rotation axis 15. The rotation axis 15 is arranged on the bracket of the base 8, and the bracket, the shell, and the bottom surface are integrated, and the rotor 11 is arranged in the shell. The rotor 11 is composed of a copper wire, a rotor bar, and a rotor core, and is connected to the rotation axis 15 through a key. The rotor 11 leads out current through the first brush 22 and the second brush 23, and the first brush 22 and the second brush 23 are connected to an external circuit. The rotation axis 15 is connected to the first blocking piece 12 through the first screw 13 and the second screw 14, and the rotation axis 15 is limited in translation through the first blocking piece 12. The rotation axis 15 is in clearance fit with the base 8. The first magnetic material 10 and the second magnetic material 26 are arranged with opposite magnetic poles to form an approximately uniform magnetic field.

[0037] The first spring 4, the second spring 5, the third spring 18, and the fourth spring 19 are fixed to the base 8. The first spring 4, the second spring 5, the third spring 18, and the fourth spring 19 are fixed to the top cover 3.

[0038] When the top cover 3 is subjected to a working load, the vibration isolator supports the load through the elastic force generated by the stiffness structure. When subjected to vibration excitation, the first longitudinal axis 1, the second longitudinal axis 2, the third longitudinal axis 20, and the fourth longitudinal axis 21 constrain the top cover 3 in the radial direction to make it only slide in the axial direction, thereby ensuring the stability of the vertical movement.

[0039] The rotor 11 contains a coil, and forms a loop with any other external circuit. The first magnetic material 10 and the second magnetic material 26 are arranged with opposite magnetic poles to form an approximately uniform magnetic field. The magnetic material can be composed of more than one magnet that is axially attracted and adhered. When it is necessary to change the working load or working condition of the vibration isolator, the magnetic induction strength can be adjusted by changing the size or type of the first magnetic material 10 and the second magnetic material 26, adjusting the length of the crank rocker, and changing the winding form and number of turns of the coil in the rotor 11, so as to change the nonlinear damping size and phase characteristics of the vibration isolator, and match the working conditions under different conditions. The circuit can be selected in series or parallel according to different needs, allowing external circuits with different characteristics to be used to adjust the current, thereby achieving the regulation and control of the damping. The top cover 3 drives the rotor 11 to rotate to generate current, thereby generating a nonlinear electromagnetic damping force. The damping force is related to the speed and displacement according to different winding methods, so as to achieve the purpose of low-frequency vibration isolation from the damping end. The external circuit can be added with energy collection or active control components, at which time the purposes of energy conversion and control can be expanded.

[0040] As shown in Figure 3 The rotor 11 is composed of a copper wire, a rotor bar, and a rotor core, and is connected to the rotation axis 15 through a key. The crank rocker system drives the rotation axis to move, and then drives the rotor to rotate.

[0041] Figure 4 It is a front view cross-sectional view of the vibration isolator; Figure 5 This is a schematic diagram of the base; Figure 6 Schematic diagram of the connection of the crank-rocker mechanism of the nonlinear electromagnetic vibration isolator of the present invention; Figure 7 This is the connection diagram between the rocker and the rotation axis; Figure 8 It is a cross-sectional view of the rear part of the rotating shaft; Figure 9 This is a diagram of the connection between the crank and the top.

[0042] As shown in the above figure, the isolator uses a crank-rocker mechanism to transmit force and displacement. When the top cover 3 is subjected to a load, the load is balanced by the first spring 4, second spring 5, third spring 18, and fourth spring 19. When the base 8 is subjected to vibration excitation, the excitation drives both the top cover 3 and the load to move vertically. The first longitudinal axis 1, second longitudinal axis 2, third longitudinal axis 20, and fourth longitudinal axis 21 radially constrain the top cover 3, restricting it to axial sliding, ensuring the stability of vertical movement. The internal layout of the rotor 11 can be adjusted to change its mass, coil winding method, etc., and the electronic components of the coil's external circuit can also be adjusted to adjust the magnitude and phase of the damping force.

[0043] It should be noted that in the nonlinear electromagnetic vibration isolator of the present invention, the conductor portion of the rotor 11 is made of copper or other low resistivity metals, and except for the first magnetic material 10 and the second magnetic material 26, the remaining components are made of low magnetic permeability materials.

[0044] The first magnetic material 10, the second magnetic material 26 and the rotor 11 generate electromagnetic coupling. By setting the number of turns, the damping force is different during small excitation and large excitation. At the same time, due to the transmission method of the crank rocker mechanism, the transmission effect is different at different positions, so that the vibration isolator can achieve the effect of low-frequency vibration isolation.

[0045] Principle Description

[0046] In the nonlinear electromagnetic vibration isolator of the present invention, when the rotor 11 rotates, the coil cuts the magnetic flux lines to generate current, thereby generating an electromagnetic damping force. The first spring 4, the second spring 5, the third spring 18, and the fourth spring 19 use a linear spring structure to provide the required stiffness force. When the vibration isolator moves, the Ampere force generated by the conductor cutting the magnetic flux lines constitutes an electromagnetic damping force, achieving the effect of vibration isolation. When the top cover 3 is subjected to the working load, the load is provided by the stiffness of the stiffness structure, and the nonlinear damping force has different nonlinear characteristics under different working conditions. When the base 8 is subjected to vibration excitation, the base 8 drives the top cover 3 and the load to move in the vertical direction. The first longitudinal axis 1, the second longitudinal axis 2, the third longitudinal axis 20, and the fourth longitudinal axis 21 generate radial constraints on the top cover 3 so that it can only slide in the axial direction, ensuring the stability of the vertical movement.

[0047] During motion, the transmissibility curves of different vibration isolators are as follows: Figure 10 The coils within the rotor 11 can be connected to various circuit components to regulate the magnitude and phase of the current during motion, thereby achieving variable damping under varying excitations. Furthermore, the ability to control the coil current using a circuit and to harvest electrical energy through the circuit allows for scalability, including active control and energy harvesting.

[0048] The damping structure of the present invention can be used in conjunction with a variety of existing rigid structures and has a wide range of applications. In the absence of conflict, the embodiments of the present invention and the features thereof can be combined with each other.

Claims

1. A nonlinear vibration isolator comprising electromagnetic damping and a crank rocker mechanism, characterized in that: It comprises a crank rocker, a base (8), a base back cover (9), a first magnetic material (10), and a second magnetic material (26); The first magnetic material (10) and the second magnetic material (26) are fixedly arranged on the base (8), are sleeved with the base (8), and are embedded in a cavity of the base (8) containing the rotor. The base (8) is screwed together with the base back cover (9). The first spring (4), the second spring (5), the third spring (18), and the fourth spring (19) are fixedly connected to the base (8); and the first spring (4), the second spring (5), the third spring (18), and the fourth spring (19) are fixedly connected to the top cover (3); The crank rocker comprises a rocker (6) and a crank (7); the rocker (6) is connected to the top cover (3) via a second component connecting shaft (25); the crank (7) is engaged with the rotating shaft (15) via a key; the rocker (6) and the crank (7) are connected via a first component connecting shaft (16); the first component connecting shaft (16) is clearance-matched with the rocker (6) and the crank (7), and is fixed via a second baffle (17); The base (8) comprises a hollow cylindrical shell capable of accommodating a rotor, a rectangular bottom surface, and a bracket for limiting a rotating shaft (15); a rotating shaft (15) is arranged on the bracket of the base (8); the bracket, the hollow cylindrical shell, and the bottom surface are integrated; a rotor (11) is arranged in the hollow cylindrical shell; The rotor (11) is composed of a copper conductor, rotor bars, and a rotor core, and is connected to a rotating shaft (15) via a key. The rotor (11) conducts current via a first brush (22) and a second brush (23), and the first brush (22) and the second brush (23) are connected to an external circuit.

2. The nonlinear vibration isolator comprising electromagnetic damping and a crank rocker mechanism according to claim 1, characterized in that: The nonlinear vibration isolator further comprises a first longitudinal axis (1), a top cover (3), a second longitudinal axis (2), a third longitudinal axis (20), and a fourth longitudinal axis (21); the top cover (3) is restricted in rotation and horizontal displacement by the first longitudinal axis (1), the second longitudinal axis (2), the third longitudinal axis (20), and the fourth longitudinal axis (21), and the top cover (3) moves in the vertical direction; the first longitudinal axis (1), the second longitudinal axis (2), the third longitudinal axis (20), and the fourth longitudinal axis (21) are all arranged on the base (8).

3. The nonlinear vibration isolator comprising electromagnetic damping and a crank rocker mechanism according to claim 2, characterized in that: The second component connecting shaft (25) is clearance-matched with the rocker (6) and the top cover (3) and is fixed by a third baffle (24).

4. The nonlinear vibration isolator comprising electromagnetic damping and a crank rocker mechanism according to claim 3, characterized in that: The rotating shaft (15) is connected to the first baffle (12) through a first screw (13) and a second screw (14), and the rotating shaft (15) is restricted from translation by the first baffle (12); the rotating shaft (15) is clearance-matched with the base (8).

5. The nonlinear vibration isolator with electromagnetic damping and crank rocker mechanism according to claim 1, characterized in that: The magnetic poles of the first magnetic material (10) and the second magnetic material (26) are arranged in opposite directions to form an approximately uniform magnetic field.

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