CN108869626A - A kind of adjustable vibration-isolating platform of pyramid - Google Patents

Abstract

The invention discloses a pyramid-shaped adjustable vibration isolation platform, which may include an upper plate and a lower plate. There are multiple groups of quasi-zero unit structures symmetrically connected between the upper plate and the lower plate, and each group of quasi-zero unit structures includes three A quasi-zero stiffness unit, the two ends of the quasi-zero stiffness unit are respectively connected to the upper plate and the lower plate through universal couplings; three quasi-zero stiffness units in each group of quasi-zero stiffness units are connected to the upper The diameter of the circle formed by the connecting points of the plates is smaller than the diameter of the circle formed by the connecting points of the three quasi-zero stiffness units and the lower plate; the center of the upper plate is provided with a cross groove, and the upper plate is surrounded by There are symmetrical through holes, and the lower plate and the upper plate have the same structure. The pyramid-shaped adjustable vibration isolation platform provided by the invention can effectively reduce the dynamic stiffness of the whole device without affecting its static bearing capacity, and has very good vibration isolation performance.

Description

A Pyramid Adjustable Vibration Isolation Platform

technical field

The invention relates to the technical field of vibration isolation platforms, in particular to a pyramid-shaped adjustable vibration isolation platform.

Background technique

Vibration is very common in the field of mechanical engineering. During the vibration process, if the vibration level exceeds a certain range, it will not only generate large noise, but also have a negative impact on the surrounding environment, affect the working performance of the equipment, shorten its service life, make related parts invalid, and even seriously A safety accident occurs, which threatens the safety of life and property. Therefore, in the installation of existing mechanical equipment, the vibration isolation device for the purpose of reducing vibration is an indispensable part of the whole product. In order to eliminate the influence of the vibration of the fixed surface on the equipment, a vibration damping device is usually installed between the equipment and the fixed surface.

Commonly used damping devices are based on viscous damping and positive stiffness spring models. According to the vibration theory, when the vibration frequency is greater than the natural frequency times, the transmission rate of vibration is less than 1, that is, only at this time can the actual vibration reduction effect be achieved. Due to the natural frequency The natural frequency of the device is positively correlated with the overall stiffness of the device, and negatively correlated with the mass of the device, that is, increasing the overall mass of the device will reduce its natural frequency, and reducing the overall stiffness of the device will also reduce its natural frequency. In order to obtain better vibration isolation performance, in the past, the natural frequency was reduced by increasing the mass or reducing the stiffness, but this also led to the problems of large device volume, large static deformation and low bearing capacity.

Contents of the invention

The purpose of the present invention is to provide a pyramid-shaped adjustable vibration isolation platform to solve the problems of the above-mentioned prior art, which can effectively reduce the dynamic stiffness of the whole device without affecting its static bearing capacity, and has a very good Vibration isolation performance.

To achieve the above object, the present invention provides the following scheme:

The present invention provides a pyramid-shaped adjustable vibration isolation platform, which includes an upper plate and a lower plate. There are multiple groups of quasi-zero unit structures symmetrically connected between the upper plate and the lower plate. Each group of quasi-zero unit structures includes three quasi-zero unit structures. A zero-stiffness unit, the two ends of the quasi-zero-stiffness unit are respectively connected to the upper plate and the lower plate through universal couplings; three quasi-zero-stiffness units in each group of quasi-zero-stiffness units are connected to the upper plate The diameter of the circle formed by the connecting points of the three quasi-zero stiffness units and the connecting points of the lower plate is smaller than the diameter of the circle formed by the connecting points of the three quasi-zero stiffness units and the lower plate; Symmetrical through holes, the lower plate and the upper plate have the same structure.

Optionally, a connecting shaft is installed on the quasi-zero stiffness unit, and the connecting shaft is fixedly connected to one end of the universal joint, and wedge blocks are fixedly installed on the upper plate and the lower plate respectively, and the wedge A protruding cylinder is arranged at the lower end of the block, and the other end of the universal coupling is fixedly connected with the wedge-shaped block through the protruding cylinder.

Optionally, the quasi-zero stiffness unit includes a square cylinder; the upper end of the square cylinder is connected with a cylinder cover, and the lower end is connected with a chassis cover; a shaft is fixed inside the square cylinder, and an electromagnetic coil is wound on the shaft. An annular permanent magnet is arranged outside the electromagnetic coil; the upper part of the chassis cover is connected with a shaft chassis through a mechanical spring, and the shaft chassis is fixedly connected with the bottom of the shaft through bolts.

Optionally, the upper part of the shaft is covered with an inner bushing, the inner bushing is covered with an outer bushing, and flanges are provided on the top of the inner bushing and the outer bushing; the outer bushing The flange of the sleeve is located on the cover, and the flange of the outer bush and the flange of the inner bush are fixedly connected by hexagon socket bolts.

Optionally, an annular flange is arranged in the middle of the shaft, and the electromagnetic coil is wound on the shaft below the annular flange.

Optionally, the outer diameter of the connection between the inner bush and the shaft decreases gradually; the upper end of the outer bush is sleeved on the inner bush, and the lower end is sleeved on the shaft.

Optionally, the ring-shaped permanent magnet is in close contact with the inner wall of the square cylinder, and the bottom of the ring-shaped permanent magnet is arranged at the bottom of the square cylinder, and the top of the ring-shaped permanent magnet is arranged at the bottom of the cylinder cover.

Optionally, one end of the connecting shaft is provided with threads, the top of the shaft is provided with a threaded hole, and the threaded end of the connecting shaft is threadedly connected with the threaded hole of the shaft.

Compared with the prior art, the present invention has achieved the following technical effects:

The device invented this time is a vibration isolation table with six degrees of freedom vibration isolation performance, which is based on "quasi-zero stiffness" and has good multi-directional vibration isolation performance. With quasi-zero stiffness as the unit, a pyramid-shaped four-corner vibration isolation platform is constructed with a simple structure. The electromagnetic structure can change the stiffness characteristics by adjusting the magnitude of the current. At the same time, the chute between the upper and lower plates can effectively adjust the height of the platform, so that the whole device has better performance in the actual installation environment and vibration isolation performance adjustment. Strong adaptability.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without paying creative labor.

Fig. 1 is the structure schematic diagram of pyramid type adjustable vibration isolation platform of the present invention;

Fig. 2 is the A-A cross-sectional view of the pyramid-shaped adjustable vibration isolation platform of the present invention;

Fig. 3 is the structure diagram of each group of quasi-zero units of the pyramid-type adjustable vibration isolation platform of the present invention;

Fig. 4 is the quasi-zero stiffness unit structure schematic diagram of pyramid-type adjustable vibration isolation platform of the present invention;

Fig. 5 is the cross-sectional view of the quasi-zero stiffness unit B-B of the pyramid-shaped adjustable vibration isolation platform of the present invention;

Among them, 1 is the upper plate, 2 is the first hexagon socket bolt, 3 is the spring washer, 4 is the wedge block, 5 is the universal coupling, 6 is the connecting shaft, 7 is the quasi-zero stiffness unit, 8 is the lower plate , 9 is the shaft, 10 is the inner bush, 11 is the second hexagon socket bolt, 12 is the outer bush, 13 is the cylinder cover, 14 is the square cylinder, 15 is the annular permanent magnet, 16 is the electromagnetic coil, 17 is the shaft chassis , 18 is a chassis cover, 19 is a mechanical spring, 20 is a third inner hexagon bolt, 21 is a cross recess, and 22 is a through hole.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The purpose of the present invention is to provide a pyramid-shaped adjustable vibration isolation platform to solve the problems of the above-mentioned prior art, which can effectively reduce the dynamic stiffness of the whole device without affecting its static bearing capacity, and has a very good Vibration isolation performance.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

The present invention provides a pyramid-shaped adjustable vibration isolation platform, as shown in Figures 1-5, comprising an upper plate 1 and a lower plate 8, and four groups of quasi-zero unit structures are symmetrically connected between the upper plate 1 and the lower plate 8 , each group of quasi-zero unit structures includes three quasi-zero stiffness units 7, and the two ends of the quasi-zero stiffness units 7 are respectively connected to the upper plate 1 and the lower plate 8 through universal couplings 5; the three quasi-zero unit structures in each group The diameter of the circle formed by the connection points of three quasi-zero stiffness units 7 and the upper plate 1 is smaller than the diameter of the circle formed by the connection points of three quasi-zero stiffness units 7 and the lower plate 8; the center of the upper plate 1 is provided with a cross groove 21 , The upper plate 1 is surrounded by symmetrical through holes 22, and the lower plate 8 has the same structure as the upper plate 1.

Further preferably, a connecting shaft 6 is installed on the quasi-zero stiffness unit 7, and one end of the connecting shaft 6 is fixedly connected with the universal joint 5. The upper plate 1 and the lower plate 8 are respectively fixedly equipped with a wedge block 4, and the lower end of the wedge block 4 A protruding cylinder is provided, and the other end of the universal joint 5 is fixedly connected with the wedge block 4 through the protruding cylinder.

The quasi-zero stiffness unit 7 includes a square cylinder 14; the upper end of the square cylinder 14 is connected with a cylinder cover 13, and the lower end is connected with a chassis cover 18; a shaft 9 is fixed inside the square cylinder 14, and an electromagnetic coil 16 is wound on the shaft 9, and the outside of the electromagnetic coil 16 An annular permanent magnet 15 is provided; the upper part of the chassis cover 18 is connected with the shaft chassis 18 through a mechanical spring 19, and the shaft chassis 18 is fixedly connected with the bottom of the shaft 9 through bolts. The upper part of the shaft 9 is covered with an inner bushing 10, the inner bushing 10 is covered with an outer bushing 12, and the tops of the inner bushing 10 and the outer bushing 12 are provided with flanges; the flanges of the outer bushing 12 are located on the cylinder cover 13, and the flange of the outer bushing 12 and the flange of the inner bushing 10 are fixedly connected by the second hexagon socket bolt 11 .

An annular flange is arranged in the middle of the shaft 9, and the electromagnetic coil 16 is wound on the shaft 9 below the annular flange. The outer diameter of the connection between the inner bush 10 and the shaft 9 gradually decreases; the upper end of the outer bush 12 is sleeved on the inner bush 10, and the lower end is sleeved on the shaft 9, and the inner bush 10 is connected by the second hexagon socket bolt 11 It is connected with the outer bushing 12 and produces a squeezing effect to lock the shaft 9. The annular permanent magnet 15 is in close contact with the inner wall of the square cylinder 14 , and the bottom of the annular permanent magnet 15 is arranged on the bottom of the square cylinder 14 , and the top of the annular permanent magnet 15 is arranged on the bottom of the cylinder cover 13 .

Specifically, the electromagnetic coil 16 is powered on through the lead wire. The axle chassis 17 is connected with the axle 9 by bolts. The electromagnetic coil 16 is fixed to the shaft chassis 17 by the flange of the shaft 9 . Annular permanent magnet 15 is fixed with square cylinder by cylinder cover 13. The chassis cover 18 is connected to the square cylinder 14 through the third hexagon socket head bolt 20 . One end of the connecting shaft 6 is provided with a thread, and the top of the shaft 9 is provided with a threaded hole, and the threaded end of the connecting shaft 6 is connected with the threaded hole of the shaft 9 by threads. A spring washer 3 is provided at the joint between the first hexagon socket bolt 2 and the upper plate 1 or the lower plate 8, so that the connection is tighter.

When the present invention works, the lower plate 8 of the vibration-isolation platform is connected to the vibration source. When the vibration source is the ground, it is connected through four through holes 22. When the vibration source is mechanical, it is connected through the cross groove 21. The vibration of the vibration source is transmitted to the wedge block 4 through the lower plate 8, the spring washer 3, and the first hexagon socket bolt 2 successively, and then transmitted to the inside of the quasi-zero stiffness unit 7 by the universal coupling 5 and the connecting shaft 6. In the quasi-zero stiffness unit, the vibration passes through the chassis cover 18, the mechanical spring 19, the shaft chassis 17, and the shaft 9, and then is transmitted to the connecting shaft 6, via the universal joint 5, the wedge block 4, the first hexagon socket bolt 2 and The spring washer 3 provided on the first hexagon socket bolt 2 is transferred to the upper plate. After the electromagnetic coil 16 inside the quasi-zero stiffness unit is fed with a current in a specified direction (the signs "+" and "-" in the figure indicate the positive and negative poles of the power supply), an electromagnetic field is generated, which interacts with the annular permanent magnet 15 to form a negative stiffness effect. By adjusting the magnitude of the current, the overall stiffness after the parallel connection of the electromagnetic negative stiffness and the mechanical spring 19 tends to zero, forming a quasi-zero stiffness characteristic with good vibration isolation performance. Multiple vibration isolation units are formed into the same pyramid shape, and four groups of pyramids are used as the four corners of the vibration isolation platform. Due to the coupling effect between the quasi-zero stiffness units, good simultaneous vibration isolation in multiple directions can be achieved very well. .

In the present invention, specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the method and core idea of the present invention; meanwhile, for those of ordinary skill in the art, according to the present invention The idea of the invention will have changes in the specific implementation and scope of application. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims (8)

1. a kind of adjustable vibration-isolating platform of pyramid, it is characterised in that：Including upper plate and lower plate, the upper plate and lower plate it Between be symmetrically connected with the quasi- zero location structure of multiple groups, every group of quasi- zero location structure includes three quasi- zero stiffness units, and described quasi- zero just Degree unit both ends pass through Hooks coupling universal coupling respectively and connect with the upper plate and lower plate；Described in three in every group of quasi- zero location structure The tie point of quasi- zero stiffness unit and the upper plate be formed by the diameter of a circle quasi- zero stiffness unit described less than three with it is described The tie point of lower plate is formed by diameter of a circle；The upper plate center offers cross recess, and the upper plate surrounding offers symmetrically Through-hole, the lower plate is identical with the upper plate structure.

2. the adjustable vibration-isolating platform of pyramid according to claim 1, it is characterised in that：The quasi- zero stiffness unit On connecting shaft is installed, the connecting shaft is fixedly connected with described Hooks coupling universal coupling one end, solid respectively on the upper plate and lower plate Dingan County is equipped with wedge block, and the wedge block lower end is provided with prominent cylinder, and the Hooks coupling universal coupling other end passes through prominent cylinder It is fixedly connected with the wedge block.

3. the adjustable vibration-isolating platform of pyramid according to claim 2, it is characterised in that：The quasi- zero stiffness unit Including square tube；The square tube upper end is connected with cover, and lower end is connected with chassis lid；Axis is fixedly installed in the square tube, it is described It is wound with electromagnetic coil on axis, is provided with annular permanent magnet on the outside of the electromagnetic coil；The chassis lid top passes through mechanical elastic Spring is connected with axis chassis, and the axis chassis is fixedly connected by bolt with the bottom of the axis.

4. the adjustable vibration-isolating platform of pyramid according to claim 3, it is characterised in that：The axis top is arranged with Neck bush is arranged with external bushing on the neck bush, is provided with the edge of a wing at the top of the neck bush and the external bushing；It is described outer The edge of a wing of bushing is located on the cover, and passes through interior hexagonal spiral shell between the edge of a wing of the external bushing and the edge of a wing of the neck bush Bolt is fixedly connected.

5. the adjustable vibration-isolating platform of pyramid according to claim 3, it is characterised in that：It is provided among the axis Annular flange, the electromagnetic coil are wound on the axis below the annular flange.

6. the adjustable vibration-isolating platform of pyramid according to claim 4, it is characterised in that：The neck bush with it is described The outer diameter of shaft connection place is gradually reduced；The outer lining set upper side is sheathed on the neck bush, and lower end is sheathed on the axis On.

7. the adjustable vibration-isolating platform of pyramid according to claim 5, it is characterised in that：The annular permanent magnet with The square tube inner wall is in close contact, and the annular permanent magnet bottom is set to the square tube bottom, the annular permanent magnet top Portion is set to the cover bottom.

8. the adjustable vibration-isolating platform of pyramid according to claim 5, it is characterised in that：The one end of the connecting shaft is set It is equipped with screw thread, threaded hole is offered at the top of the axis, the end of thread of the connecting shaft and the threaded hole of the axis pass through screw thread Connection.