Search

CN-121977033-A - Non-circular gear-magnetic negative stiffness coupled quasi-zero stiffness vibration isolation device

CN121977033ACN 121977033 ACN121977033 ACN 121977033ACN-121977033-A

Abstract

The invention belongs to the technical field of mechanical vibration isolation, and particularly relates to a non-circular gear-magnetic negative stiffness coupling quasi-zero stiffness vibration isolation device. The purpose is to provide a non-circular gear-magnetism negative rigidity coupling's accurate zero rigidity vibration isolator, and this isolator can combine the non-linear motion characteristic of non-circular gear drive mechanism with magnetism negative rigidity mechanism's adjustable non-contact force, forms the accurate zero rigidity characteristic in adjustable wide displacement range near balancing position to effectively promote low frequency vibration isolation performance. The technical scheme is that the non-circular gear-magnetic negative stiffness coupled quasi-zero stiffness vibration isolation device comprises an upper bottom plate and a lower bottom plate which are horizontally arranged and are correspondingly arranged up and down, and a vertical guide structure which is connected between the upper bottom plate and the lower bottom plate and is symmetrically arranged in the left-right direction.

Inventors

  • YAN BO
  • ZHAO ZIYI
  • WANG SHANGWEN
  • YU JINGTAO
  • MA HONGYE

Assignees

  • 浙江理工大学

Dates

Publication Date
20260505
Application Date
20260304

Claims (10)

  1. 1. The non-circular gear-magnetic negative stiffness coupled quasi-zero stiffness vibration isolation device comprises an upper bottom plate (4-1) and a lower bottom plate (1-3) which are horizontally arranged and are correspondingly arranged up and down, and a vertical guide structure which is connected between the upper bottom plate and the lower bottom plate and is symmetrically arranged in the left-right direction, and is characterized by also comprising a gear rack mechanism and a non-circular gear transmission mechanism which are arranged between the upper bottom plate and the lower bottom plate; the gear rack mechanism comprises a circular gear (2-2) capable of rotating along a horizontal axis and a rack (4-2) vertically fixed on the upper base plate and meshed with the circular gear; The non-circular gear transmission mechanism comprises a first non-circular gear (2-4) coaxially connected with the circular gear, a second non-circular gear (3-3) capable of rotating along a horizontal axis and meshed with the first non-circular gear, and a permanent magnet array arranged on the second non-circular gear.
  2. 2. The non-circular gear-magnetic negative stiffness coupled quasi-zero stiffness vibration isolation device is characterized in that the circular gear and the first non-circular gear are coaxially fixed on a first connecting shaft (2-3) which is horizontally arranged, the second non-circular gear is fixed on a second connecting shaft (3-4) which is horizontally arranged, two ends of the first connecting shaft are rotatably positioned on a lower bottom plate through two supporting seats, and the second connecting shaft is parallel to the first connecting shaft and two ends of the second connecting shaft are fixed on the lower bottom plate through two supporting seats.
  3. 3. The non-circular gear-magnetic negative stiffness coupled quasi-zero stiffness vibration isolation device is characterized in that the number of teeth of the first non-circular gear is the same as that of teeth of the second non-circular gear, and the tooth top circle outer contour is the same.
  4. 4. The non-circular gear-magnetic negative stiffness coupled quasi-zero stiffness vibration isolation device according to claim 3 is characterized in that the permanent magnet array comprises a plurality of first permanent magnets (5) arranged on the end face of a second non-circular gear and a plurality of second permanent magnets (6) arranged on a second connecting shaft, and the plurality of first permanent magnets and the plurality of second permanent magnets are coaxially arranged with the second non-circular gear and are arrayed into two circular rings with unequal diameters.
  5. 5. The non-circular gear-magnetic negative stiffness coupled quasi-zero stiffness vibration isolation device is characterized in that the second non-circular gear (3-3) is provided with a larger shaft hole, a plurality of first positioning grooves (3-31) penetrating through two side end faces of the second non-circular gear and arranged into a circular ring are coaxially arranged, a plurality of first permanent magnets (5) are inserted into the plurality of first positioning grooves one by one and blocked by two baffles, and therefore the installation of the first permanent magnets is achieved.
  6. 6. The quasi-zero stiffness vibration isolation device for non-circular gear-magnetic negative stiffness coupling is characterized in that a cylindrical boss (3-41) which is matched with a second non-circular gear shaft hole is coaxially fixed on the second connecting shaft (3-4), a plurality of second positioning grooves (3-411) which penetrate through two side end faces and are arranged into a circular ring are coaxially arranged on the boss, and the plurality of second permanent magnets (6) are inserted into the plurality of second positioning grooves one by one and are plugged by the two baffles at the same time, so that the installation of the second permanent magnets is realized.
  7. 7. The non-circular gear-magnetic negative stiffness coupled quasi-zero stiffness vibration isolation device according to claim 6, wherein the axial thickness of the boss is the same as the length of the shaft hole of the second non-circular gear, and the outer diameter of the boss is matched with the shaft hole of the second non-circular gear so as to be in relative sliding fit with the shaft hole.
  8. 8. The non-circular gear-magnetic negative stiffness coupled quasi-zero stiffness vibration isolation device according to claim 7, wherein the rack is vertically fixed below the upper base plate through a rack seat (4-3) so as to be connected with the upper base plate into a whole.
  9. 9. The non-circular gear-magnetic negative stiffness coupled quasi-zero stiffness vibration isolation device is characterized in that the vertical guide structure comprises a first guide rod (1-1) and a second guide rod (1-8) which are vertically and symmetrically arranged on the left side and the right side of the device, the bottom ends of the two guide rods are fixed with a lower bottom plate, and the upper ends of the two guide rods are in sliding fit with a sliding cylinder connected with the lower bottom plate.
  10. 10. The non-circular gear-magnetic negative stiffness coupled quasi-zero stiffness vibration isolation device is characterized in that springs are sleeved on the two guide rods respectively, and two ends of each spring respectively abut against the lower bottom plate and the sliding cylinder, so that positive stiffness is provided for the upper bottom plate (4-1).

Description

Non-circular gear-magnetic negative stiffness coupled quasi-zero stiffness vibration isolation device Technical Field The invention belongs to the technical field of mechanical vibration isolation, and particularly relates to a non-circular gear-magnetic negative stiffness coupling quasi-zero stiffness vibration isolation device. Background With the rapid development of high-end technical fields such as precision machining, aerospace, precision measurement and the like, vibration control technology is facing increasingly higher performance requirements. Particularly in typical application scenarios such as ultra-precision machining equipment, optical detection instruments, spacecraft payloads, etc., effective isolation and suppression of low-frequency and even ultra-low frequency vibrations are often required. The traditional linear vibration isolator is limited by the linear rigidity of the traditional linear vibration isolator, so that the inherent design contradiction exists between the inherent frequency and the bearing capacity, and the traditional linear vibration isolator is difficult to realize a good low-frequency vibration isolation effect while maintaining enough bearing performance. The quasi-zero stiffness vibration isolator is based on the principle that positive and negative stiffness mechanisms are connected in parallel, and extremely low dynamic stiffness can be realized near a balance position, so that the natural frequency of a system can be obviously reduced, and the vibration isolation frequency band is expanded. At present, the existing quasi-zero stiffness vibration isolator mainly adopts mechanical springs, magnetic springs or air springs and the like to generate negative stiffness, but still has the problems that the adjustment is difficult, the nonlinear characteristic is single, the quasi-zero stiffness characteristic is difficult to maintain in a wide displacement range and the like. The non-circular gear is used as a special transmission mechanism capable of realizing a specific non-linear transmission ratio, and the application of the non-circular gear in the vibration isolation field is not wide at present. The magnetic stiffness mechanism has the advantages of non-contact, no friction, easy adjustment and the like, but the magnetic stiffness mechanism is difficult to realize the quasi-zero stiffness characteristic in a wide frequency range when being used independently. Therefore, there is a need to develop a novel quasi-zero stiffness vibration isolator that combines the non-circular gear nonlinear transmission characteristics and the advantages of a magnetically negative stiffness mechanism to overcome the limitations of the prior art. Disclosure of Invention The invention aims to overcome the defects of the background technology and provide the quasi-zero stiffness vibration isolator with non-circular gear-magnetic negative stiffness coupling, which can combine the non-linear motion characteristic of a non-circular gear transmission mechanism with the adjustable non-contact force of the magnetic negative stiffness mechanism to form the quasi-zero stiffness characteristic in an adjustable wide displacement range near the balance position, thereby effectively improving the low-frequency vibration isolation performance. The technical scheme provided by the invention is as follows: the non-circular gear-magnetic negative stiffness coupled quasi-zero stiffness vibration isolation device comprises an upper bottom plate and a lower bottom plate which are horizontally arranged and are correspondingly arranged up and down, and a vertical guide structure which is connected between the upper bottom plate and the lower bottom plate and is symmetrically arranged in the left-right direction, and is characterized by also comprising a gear rack mechanism and a non-circular gear transmission mechanism which are arranged between the upper bottom plate and the lower bottom plate; The gear rack mechanism comprises a circular gear capable of rotating along a horizontal axis and a rack vertically fixed on the upper bottom plate and meshed with the circular gear; The non-circular gear transmission mechanism comprises a first non-circular gear, a second non-circular gear and a permanent magnet array, wherein the first non-circular gear is coaxially connected with the circular gear, the second non-circular gear can rotate along a horizontal axis and is meshed with the first non-circular gear, and the permanent magnet array is arranged on the second non-circular gear. The circular gear and the first non-circular gear are coaxially fixed on a first connecting shaft which is horizontally arranged, the second non-circular gear is fixed on a second connecting shaft which is horizontally arranged, two ends of the first connecting shaft are rotatably positioned on the lower bottom plate through two supporting seats, and the second connecting shaft is parallel to the first connecting shaft, and two ends o