Variable-stiffness variable-damping magnetorheological vibration isolator

Abstract

The utility model provides a variable-rigidity variable-damping magnetorheological vibration isolator. A rigidity adjustable device is composed of a magnetism isolating cover, an electromagnetic spring stator, an electromagnetic spring rotor, an end cover, a spring I, an electromagnetic spring coil and a spring II. The base, the sleeve, the damping excitation coil, the magnetism isolating cover, the damping piston and the floating piston form a damping adjustable device; the rigidity-adjustable device is connected with the damping-adjustable device through a connecting rod; the electromagnetic force between the electromagnetic spring stator and the electromagnetic spring rotor is adjusted by controlling the magnitude of current in the electromagnetic spring coil, so that the rigidity characteristic of the vibration isolator is adjusted; the damping characteristic of the vibration isolator is adjusted by controlling the current in the damping excitation coil, adjusting the magnetic field intensity in the damping gap A and the damping gap B and controlling the shear yield stress of the magnetorheological fluid, finally, the rigidity characteristic and the damping characteristic of the vibration isolation device are adjustable, and the vibration isolation performance of the vibration isolation device is improved. The vibration isolation device is suitable for a vibration isolation system of a precise instrument.

Description

Technical Field

[0001] The utility model relates to a vibration isolator, in particular to a magnetorheological vibration isolator with variable stiffness and variable damping. Background Art

[0002] Mechanical vibration is widespread in aerospace, mechanics, optics, submarines, construction, and other fields, and can lead to a loss of safety and reliability in equipment and structures. Vibration isolation, as one of the most effective methods for reducing mechanical vibration, has been widely used in these fields.

[0003] Vibration isolation primarily isolates or eliminates vibration sources along the vibration transmission path, thereby increasing the vibration attenuation rate and achieving vibration reduction. In theory and engineering practice, vibration isolators are the core device for achieving vibration suppression. They are typically used as the supporting structure of the load platform to attenuate the dynamic load of the working machine on the base or protect equipment from damage caused by vibration and impact.

[0004] The vibration isolators currently in widespread use are passive vibration isolation systems composed of springs, dampers, and inertial elements. Their performance parameters, such as stiffness and damping, are fixed, and their operating frequency bandwidth is relatively narrow. They can generally only effectively attenuate high-frequency excitations and may even amplify low-frequency disturbances, making it difficult to meet the vibration requirements of the environment when the equipment is in use.

[0005] Based on this, the utility model proposes a magnetorheological vibration isolator with variable stiffness and variable damping, which realizes the adjustment of the stiffness characteristics and damping characteristics of the vibration isolation device, improves the vibration isolation performance of the vibration isolation device, and meets the broadband vibration isolation requirements of the vibration isolation system. Summary of the Invention

[0006] In order to overcome the problems existing in the background technology and meet the requirements of vibration isolators in engineering applications, the present invention proposes a vibration isolator with variable stiffness and variable damping. The vibration isolator connects an electromagnetic spring mover and a damping piston in series to work together. By controlling the current in the electromagnetic spring coil, the stiffness characteristics of the vibration isolator can be adjusted; by controlling the current in the damping excitation coil, the damping characteristics of the vibration isolator can be adjusted. Ultimately, the stiffness and damping characteristics of the vibration isolation device can be adjusted, improving the vibration isolation performance of the vibration isolation device and meeting the broadband vibration isolation requirements of the vibration isolation system.

[0007] The technical solution adopted by the utility model to solve the technical problem includes: a base (1), a sleeve (2), a damping excitation coil (3), a magnetic isolation cover (4), an electromagnetic spring stator (5), an electromagnetic spring mover (6), an end cover (7), a central shaft (8), a spring I (9), an electromagnetic spring coil (10), a spring II (11), a connecting rod (12), a damping piston (13) and a floating piston (14); the lower end surface of the sleeve (2) is fitted with the base (1) and connected by screws; the upper end surface of the sleeve (2) is fitted with the magnetic isolation cover (4) and connected by screws; the upper end surface of the magnetic isolation cover (4) is fitted with the electromagnetic spring stator (5) and connected by screws. The electromagnetic spring stator (5) is fitted and connected by screws; the upper end surface of the electromagnetic spring stator (5) is fitted and connected by screws; the central shaft (8) is connected to the electromagnetic spring mover (6) by threads and passes through the center hole of the end cover (7); the connecting rod (12) passes through the center hole of the magnetic isolation cover (4), and the two ends are connected to the electromagnetic spring mover (6) and the damping piston (13) by threads; a spring I (9) is set between the electromagnetic spring mover (6) and the end cover (7); a spring II (11) is set between the electromagnetic spring mover (6) and the magnetic isolation cover (4); the damping excitation coil (3) is wound on the damping piston (13); the electromagnetic spring coil ( 10) is wound on the electromagnetic spring mover (6); a floating piston (14) is provided between the damping piston (13) and the base (1); the closed space formed by the sleeve (2), the magnetic isolation cover (4), the damping piston (13) and the floating piston (14) is filled with magnetorheological fluid; the closed space formed by the base (1), the sleeve (2) and the floating piston (14) is filled with compressible gas for volume compensation when the damping piston (13) moves; an inner magnetic tooth (501) structure is provided in the electromagnetic spring stator (5), and an outer magnetic tooth (601) structure is provided on the electromagnetic spring mover (6), and the inner magnetic tooth (501) and the outer magnetic tooth (601) are aligned. The invention relates to a method for adjusting the damping force of an electromagnetic spring. ...

[0008] Compared with the background technology, the present invention has the following beneficial effects:

[0009] (1) The present invention can adjust the stiffness and damping characteristics of the vibration isolator by adjusting the current in the electromagnetic spring coil and the damping excitation coil, thereby achieving wide-band vibration isolation and achieving an effect similar to active vibration reduction. At the same time, it has a large controllable bearing capacity and a large damping and stiffness adjustment range.

[0010] (2) The utility model has a compact structure and occupies little space. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic structural diagram of the utility model.

[0012] Figure 2 It is a cross-sectional view of the electromagnetic spring mover of the utility model.

[0013] Figure 3 It is a cross-sectional view of the electromagnetic spring stator of the utility model.

[0014] Figure 4 This is the magnetic force line distribution diagram of the utility model.

[0015] Description of reference numerals:

[0016] 1-base, 2-sleeve, 3-damping excitation coil, 4-magnetic isolation cover, 5-electromagnetic spring stator, 6-electromagnetic spring mover, 7-end cover, 8-center shaft, 9-spring I, 10-electromagnetic spring coil, 11-spring II, 12-connecting rod, 13-damping piston, 14-floating piston. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] Figure 1 The utility model is shown as a schematic diagram of the structure of the utility model, including a base (1), a sleeve (2), a damping excitation coil (3), a magnetic isolation cover (4), an electromagnetic spring stator (5), an electromagnetic spring mover (6), an end cover (7), a central shaft (8), a spring I (9), an electromagnetic spring coil (10), a spring II (11), a connecting rod (12), a magnetorheological fluid, a damping piston (13) and a floating piston (14).

[0019] Figure 2 This is a cross-sectional view of the electromagnetic spring mover of the utility model. The electromagnetic spring mover (6) is provided with an external magnetic tooth (601) structure.

[0020] Figure 3 This is a cross-sectional view of the electromagnetic spring stator of the utility model. An inner magnetic tooth (501) structure is provided in the electromagnetic spring stator (5).

[0021] Figure 4This is a magnetic field line distribution diagram of the utility model. The annular gap between the outer circumferential surface of the damping piston (13) and the inner circumferential surface of the sleeve (2) constitutes a damping gap A and a damping gap B. The damping piston (13), the sleeve (2), the damping gap A, and the damping gap B constitute a closed magnetic field loop. When current is passed through the damping excitation coil (3), a magnetic field closed loop is formed at the sleeve (2), the damping piston (13), the damping gap A, and the damping gap B, and a magnetic field is formed in the damping gap A and the damping gap B.

[0022] The working principle of this utility model is as follows:

[0023] The magnetic isolation cover (4), the electromagnetic spring stator (5), the electromagnetic spring mover (6), the end cover (7), the spring I (9), the electromagnetic spring coil (10), and the spring II (11) constitute a stiffness adjustable device; the base (1), the sleeve (2), the damping excitation coil (3), the magnetic isolation cover (4), the magnetorheological fluid, the damping piston (13), and the floating piston (14) constitute a damping adjustable device; the stiffness adjustable device and the damping adjustable device are connected through a connecting rod (12); by controlling the electromagnetic spring coil (10 ) by adjusting the magnitude of the current in the electromagnetic spring stator (5) and the electromagnetic spring mover (6), thereby adjusting the stiffness characteristics of the vibration isolator; by controlling the magnitude of the current in the damping excitation coil (3), adjusting the magnetic field strength in the damping gap A and the damping gap B, and controlling the shear yield stress of the magnetorheological fluid, thereby adjusting the damping characteristics of the vibration isolator, and finally achieving the adjustable stiffness characteristics and damping characteristics of the vibration isolation device, thereby improving the vibration isolation performance of the vibration isolation device and meeting the broadband vibration isolation requirements of the vibration isolation system.

Claims

1. A magnetorheological isolator with variable stiffness and damping, characterized in that include: Base (1), sleeve (2), damping excitation coil (3), magnetic shielding cover (4), electromagnetic spring stator (5), electromagnetic spring mover (6), end cover (7), central shaft (8), spring I (9), electromagnetic spring coil (10), spring II (11), connecting rod (12), damping piston (13) and floating piston (14); the lower end surface of the sleeve (2) is fitted with the base (1) and connected by screws; the upper end surface of the sleeve (2) is fitted with the magnetic shielding cover (4) and connected by screws; the upper end surface of the magnetic shielding cover (4) is fitted with the ...) The spring stator (5) is fitted and connected by screws; the upper end surface of the electromagnetic spring stator (5) is fitted and connected by screws to the end cover (7); the central shaft (8) is connected to the electromagnetic spring mover (6) by threads and passes through the center hole of the end cover (7); the connecting rod (12) passes through the center hole of the magnetic isolation cover (4), and the two ends are respectively connected to the electromagnetic spring mover (6) and the damping piston (13) by threads; a spring I (9) is set between the electromagnetic spring mover (6) and the end cover (7); a spring I (9) is set between the electromagnetic spring mover (6) and the magnetic isolation cover (4) Spring II (11); the damping excitation coil (3) is wound on the damping piston (13); the electromagnetic spring coil (10) is wound on the electromagnetic spring mover (6); a floating piston (14) is provided between the damping piston (13) and the base (1); the closed space formed by the sleeve (2), the magnetic isolation cover (4), the damping piston (13) and the floating piston (14) is filled with magnetorheological fluid; the electromagnetic spring stator (5) is provided with an inner magnetic tooth (501) structure, the electromagnetic spring mover (6) is provided with an outer magnetic tooth (601) structure, and the inner magnetic tooth (5 01) is aligned with the outer magnetic tooth (601); the enclosed space formed by the base (1), the sleeve (2) and the floating piston (14) is filled with compressible gas; the base (1), the sleeve (2), the damping excitation coil (3), the magnetic isolation cover (4), the magnetorheological fluid, the damping piston (13) and the floating piston (14) constitute a damping adjustable device; the magnetic isolation cover (4), the electromagnetic spring stator (5), the electromagnetic spring mover (6), the end cover (7), the spring I (9), the electromagnetic spring coil (10) and the spring II (11) constitute a stiffness adjustable device.

2. The magnetorheological isolator with variable stiffness and variable damping according to claim 1, characterized in that: The base (1), the magnetic isolation cover (4), the end cover (7), and the floating piston (14) are made of magnetic isolation materials; the sleeve (2), the electromagnetic spring stator (5), the electromagnetic spring mover (6), and the damping piston (13) are made of magnetic conductive materials.

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