CN206054618U - The adjustable quasi- zero stiffness vibration-isolating platform of positive negative stiffness - Google Patents

Abstract

The utility model discloses a quasi-zero-stiffness vibration isolation platform with adjustable positive and negative stiffness, which comprises a moving platform, a suspension assembly, a shock absorber and an adjustment assembly. The shock absorber is connected with the movement platform, and the adjustment assembly is connected with the suspension assembly and the adjustment assembly. The shock absorber is connected and is used to adjust the initial position of the shock absorber. The quasi-zero stiffness vibration isolation platform with adjustable positive and negative stiffness of the utility model can easily adjust the stiffness, is suitable for vibration isolation in a wide frequency domain, and has good engineering applicability; while having high support stiffness, it also has very low Motion stiffness, small static deformation, low dynamic natural frequency, and good vibration isolation effect; through flexible adjustment of stiffness and damping, it can solve the inherent contradiction that restricts traditional vibration isolation systems, that is, the contradiction between low-frequency vibration transmission rate and high-frequency vibration attenuation rate .

Description

Quasi-zero stiffness vibration isolation platform with adjustable positive and negative stiffness

technical field

The utility model belongs to the technical field of shock absorbers. Specifically, the utility model relates to a quasi-zero stiffness vibration isolation platform with adjustable positive and negative stiffness.

Background technique

High-precision machine tools and precision instruments and equipment, high-level scientific laboratory equipment, missile transport vehicles, etc., put forward higher performance requirements for the vibration isolation platform. Prominent vibration isolation platform.

Utility model content

The utility model provides a quasi-zero-stiffness vibration-isolation platform which has high static stiffness and low dynamic stiffness and can realize wide-frequency vibration-isolation with adjustable quasi-zero stiffness.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a quasi-zero stiffness vibration isolation platform with adjustable positive and negative stiffness, including:

moving platform;

suspension components;

a shock absorber connected to the moving platform; and

The adjusting component is connected with the suspension component and the shock absorber, and is used for adjusting the initial position of the shock absorber.

The adjustment assembly includes a first adjustment rod that is threadedly connected with the suspension assembly and a second adjustment rod that is threaded with the first adjustment rod and can perform reciprocating linear motion relative to the suspension assembly. The vibrator is connected by rotation.

The first adjustment rod has two sections of external threads that are threadedly connected with the suspension assembly and the second adjustment rod respectively, and the directions of rotation of the two sections of external threads are opposite.

The suspension assembly includes a first suspension frame and a second suspension frame oppositely arranged and connected, the first suspension frame and the second suspension frame are provided with the adjustment assembly, and the first suspension frame and the second suspension frame are provided with the adjustment assembly. The provided adjusting assembly is connected with the moving platform through the shock absorber.

A plurality of the shock absorbers are circumferentially distributed inside the suspension assembly, and among the two adjacent shock absorbers, one of the shock absorbers is connected to the adjustment assembly provided on the first suspension connected, and the other shock absorber is connected with the adjustment assembly provided on the second suspension bracket.

The shock absorbers are evenly distributed around the moving platform with the axis of the moving platform as the center line.

The first suspension frame has a first strut, the second suspension frame has a second strut aligned with the first strut, and the first strut and the second strut are connected by a middle connecting piece.

The first pillar and the second pillar are threadedly connected to the middle connecting piece, and the middle connecting piece has a threaded hole in which the first pillar and the second pillar are screwed in.

The first suspension frame and the second suspension frame are hexagonal structures.

The quasi-zero stiffness vibration isolation platform with adjustable positive and negative stiffness of the utility model has the following advantages:

1. The vibration isolation platform not only solves the problem of traditional linear vibration isolation systems in isolating low-frequency or ultra-low-frequency vibrations, but also avoids the shortcomings of active and semi-active control vibration isolators with complex structures, high manufacturing costs and high energy consumption;

2. Within a certain deformation range of the vibration isolation platform, the three vibration damping springs at the upper end are used as positive stiffness elements and the three vibration damping spring elements at the lower end are used as negative stiffness vibration damping spring elements in parallel, which can realize the vibration isolation platform near its equilibrium position. nonlinear stiffness;

3. The vibration isolation platform can adjust the initial position of the shock absorber by adjusting the components to achieve wide frequency domain vibration isolation. It can be widely used in precision instruments and equipment that require strict vibration isolation, and has good engineering practicability.

4. The vibration isolation platform not only has high support stiffness, but also has very low motion stiffness, small static deformation, and vibration isolation effect with low dynamic natural frequency.

Description of drawings

This manual includes the following drawings, the contents shown are:

Fig. 1 is the structural representation of the vibration isolation platform of the present utility model;

Fig. 2 is the structural representation of the first hanger;

Fig. 3 is the structural representation of the second hanger;

Fig. 4 is the structural representation of suspension assembly;

Fig. 5 is a structural schematic diagram of the vibration isolation system;

Fig. 6 is the structural representation of moving platform;

Figure 7 is a sectional view of the adjustment assembly;

Labeled in the figure:

1. Intermediate connector; 2. Shock absorber; 21. Pin hole; 22. Damping spring; 3. Moving platform; 31. Loading plate; 32. Base; 33. Hinge; 34. Pin hole; 35. Bolt ; 4, the first suspension frame; 41, the first pillar; 42, double-ended studs; 43, V-shaped connectors; 44, guide seat; 5, the second suspension frame; 51, the second pillar; 52, double ends Stud; 53, V-shaped connector; 54, guide seat; 6, adjustment assembly; 61, first adjustment rod; 62, second adjustment rod; 63, hinge; 7, pin shaft;

detailed description

Next, with reference to the accompanying drawings, through the description of the embodiments, the specific implementation of the present utility model will be further described in detail, the purpose is to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solutions of the present utility model , and contribute to its implementation.

As shown in Figures 1 to 7, the utility model provides a quasi-zero-stiffness vibration isolation platform with adjustable positive and negative stiffness, including a moving platform 3, a suspension assembly, a shock absorber and an adjustment assembly 6, and the shock absorber is compatible with The moving platform 3 is connected, and the adjustment assembly 6 is connected with the suspension assembly and the shock absorber, and is used for adjusting the initial position of the shock absorber. The quasi-zero-stiffness vibration isolation platform with adjustable positive and negative stiffness of the utility model can set certain structural parameters to realize quasi-zero stiffness and non-linear stiffness near the equilibrium position of the vibration-isolation platform at the equilibrium position, and can solve the problem of traditional linear The vibration isolation system is difficult to isolate low-frequency or ultra-low-frequency vibrations; the stiffness can be easily adjusted, suitable for wide-frequency vibration isolation, and has good engineering applicability; while having high support stiffness, it also has very low motion stiffness, static The deformation is small, the dynamic natural frequency is low, and the vibration isolation effect is good; through the flexible adjustment of stiffness and damping, it can solve the inherent contradiction that restricts the traditional vibration isolation system, that is, the contradiction between low-frequency vibration transmission rate and high-frequency vibration attenuation rate. The vibration isolation platform using positive and negative stiffness parallel connection proposed by the utility model is a new vibration reduction and vibration isolation platform, which has good economy and practicability, and can be popularized in various fields.

Specifically, as shown in Figure 1, one end of the shock absorber is rotatably connected to the moving platform 3, and the other end is rotatably connected to the adjustment assembly 6. perpendicular to each other. The center line of the shock absorber is perpendicular to the axis of the rotating connection points at both ends of the shock absorber. The adjustment assembly 6 is used to adjust the initial angle between the center line of the shock absorber and the horizontal plane, that is, to change the initial position of the shock absorber , thereby changing the initial preload of the damping spring on the shock absorber.

As shown in Figures 1 and 4, the suspension assembly includes a first suspension frame 4 and a second suspension frame 5 that are oppositely arranged and connected, and an adjustment assembly 6 is provided on the first suspension frame 4 and the second suspension frame 5. The adjusting assembly 6 provided on the first suspension frame 4 and the second suspension frame 5 is connected with the moving platform 3 through a shock absorber. The first suspension frame 4 and the second suspension frame 5 are connected to form a suspension assembly of a frame structure, and the inner cavity is used for accommodating the shock absorber and the moving platform 3 . The first suspension frame 4 and the second suspension frame 5 are connected through the middle connecting piece 1 between the two to form an integrated structure. A plurality of them are provided to improve the connection reliability between the first suspension frame 4 and the second suspension frame 5 .

As shown in Figures 1 and 7, preferably, the adjustment assembly 6 includes a first adjustment rod 61 that is threaded with the suspension assembly and a first adjustment rod 61 that is threaded with the first adjustment rod 61 and can perform reciprocating linear motion relative to the suspension assembly. Two adjustment rods 62, the first adjustment rod 61 is used to produce the driving force that makes the second adjustment rod 62 do reciprocating linear motion along its length direction, the suspension assembly plays a guiding role to the second adjustment rod 62, and ensures that the second adjustment rod 62 to do linear motion. The lifting lug at one end of the shock absorber is rotatably connected to the moving platform 3 , and the lug at the other end is rotatably connected to the end of the second adjusting rod 62 , and the axes of the rotating connection points at both ends of the shock absorber are parallel to the axis of the second adjusting rod 62 . The direction of motion is perpendicular. When it is necessary to adjust the initial position of the shock absorber, by rotating the first adjustment rod 61, the second adjustment rod 62 is moved linearly, the second adjustment rod 62 can compress or stretch the shock absorber, and the length of the second adjustment rod 62 The angle between the direction and the centerline of the shock absorber is adjusted so that the initial preload of the shock spring can be varied.

As shown in Figures 1 and 7, the outer surface of the first adjusting rod 61 has two sections of external threads that are threadedly connected with the suspension assembly and the second adjusting rod 62 respectively. The inside of the second adjusting rod 62 is provided with an internal thread hole for inserting the first adjusting rod 61 . The shock absorber is located between the adjustment assembly 6 and the moving platform 3. When the adjustment assembly 6 adjusts the stretching of the shock absorber, the first adjustment rod 61 and the second adjustment rod 62 move in a direction away from the moving platform 3; 6. When the shock absorber is compressed, the first adjusting rod 61 and the second adjusting rod 62 move towards the direction approaching the moving platform 3 .

As preferably, as shown in Figure 1, a plurality of shock absorbers are evenly distributed along the circumferential direction on the inner side of the suspension assembly, and among the two adjacent shock absorbers, one of the shock absorbers is connected to the first suspension frame 4 The second adjustment rod 62 of the adjustment assembly 6 provided is rotatably connected, and the other shock absorber is rotatably connected with the second adjustment rod 62 of the adjustment assembly 6 provided on the second suspension frame 5, that is, the number of shock absorbers is the same as that of the adjustment assembly 6 The number is equal, each shock absorber is connected with an adjustment assembly 6 respectively, and the first suspension frame 4 and the second suspension frame 5 are provided with the same number of adjustment assemblies 6, the first suspension frame 4 and the second suspension frame 5 Adjust the components 6 and arrange them in a staggered manner. In the state shown in Figure 1, the shock absorbers are evenly distributed around the moving platform 3 with the axis of the moving platform 3 as the center line, and the adjustment assembly 6 on the first suspension frame 4 and the second suspension frame 5 is also based on the moving platform 3 The axis is that the center line is evenly distributed around the moving platform 3 . In this embodiment, as shown in FIG. 1 , there are six shock absorbers in total, and three adjustment assemblies 6 are respectively arranged on the first suspension frame 4 and the second suspension frame 5 .

As shown in Figures 4 and 5, one end of the shock absorber is rotatably connected to the hinge 63 provided at the end of the second adjusting rod 62 through a pin shaft, and the other end is rotatably connected to the hinge 33 provided on the moving platform 3 through a pin shaft. connect. The moving platform 3 includes a bearing plate 31 and a base 32 fixedly arranged at the center of the bottom surface of the bearing plate 31, the base 32 is located at the center of all shock absorbers, and a plurality of hinges 33 are evenly arranged on the base 32 along the circumferential direction, each The hinges 33 are each connected to a shock absorber.

As shown in Figures 1 and 4, the first suspension frame 4 and the second suspension frame 5 are connected by a plurality of studs, V-shaped connectors and arrow-shaped guide seats, and are hollow inside and circumferentially Closed hexagonal structure.

Specifically, as shown in Figure 2, the stud 42 of the first suspension frame 4 is located between the guide seat 44 and the V-shaped connector 43, and the stud 42, the guide seat 44 and the V-shaped connector 43 are both threaded connection, the outer surfaces of the two ends of the double-ended stud 42 have a section of external thread respectively, and the direction of rotation of the external threads of the two ends of the double-ended stud 42 is opposite, and correspondingly there is a set in the guide seat 44 and the V-shaped connector 43. The threaded end of the stud 42 is screwed into an internally threaded hole. The included angle of the V-shaped connector 43 is preferably 120 degrees, and the two ends of the V-shaped connector 43 respectively have an internally threaded hole, and the included angle between the axes of the two internally threaded holes is 120 degrees, and the two internally threaded holes The screw threads of are opposite in direction, and are respectively used to be connected with a double-ended stud 42. The arrow-shaped guide seat 44 has three ends, wherein the opposite two ends respectively have an internally threaded hole, the angle between the axes of the two internally threaded holes is also 120 degrees, and the two internally threaded holes The screw threads of are opposite in direction, and are respectively used to be connected with a double-ended stud 42. In this embodiment, three guide seats 44, studs 42 and V-shaped connectors 43 of the first suspension frame 4 are provided, and one end of each stud 42 is threadedly connected to the guide seat 44, and the other end is connected to the V-shaped connector. Shape connector 43 is threadedly connected, forms the first suspension frame 4 of regular hexagon.

As shown in Figure 3, the structure of the second suspension frame 5 is basically similar to the structure of the first suspension frame 4, and the stud 52 of the second suspension frame 5 is located between the guide seat 54 and the V-shaped connector 53, and the guide seat The structure of 54 is the same as that of the guide seat 44, the structure of the stud 52 is the same as that of the stud 42, and the structure of the V-shaped connector 53 is the same as that of the V-shaped connector 43. The double-ended stud 52 is threadedly connected to the guide seat 54 and the V-shaped connector 53, and the outer surfaces of both ends of the double-ended stud 52 have a section of external thread respectively, and the direction of rotation of the external threads at both ends of the double-ended stud 52 is On the contrary, internally threaded holes for threaded ends of the studs 52 to be screwed into are respectively provided in the guide seat 54 and the V-shaped connecting piece 53 . The included angle of the V-shaped connector 53 is preferably 120 degrees, and the two ends of the V-shaped connector 53 respectively have an internally threaded hole, and the included angle between the axes of the two internally threaded holes is 120 degrees, and the two internally threaded holes The screw threads of each are opposite in direction and are respectively used to be connected with a double-ended stud 52. The arrow-shaped guide seat 54 has three ends, wherein the opposite two ends respectively have an internally threaded hole, the angle between the axes of the two internally threaded holes is also 120 degrees, and the two internally threaded holes The screw threads of each are opposite in direction and are respectively used to be connected with a double-ended stud 52. In this embodiment, three guide seats 54, studs 52, and V-shaped connectors 53 of the second suspension frame 5 are provided, and one end of each stud 52 is threadedly connected to the guide seat 54, and the other end is connected to the V-shaped connector. Shaped connector 53 is threaded to form the second suspension frame 5 of regular hexagon.

As shown in Figure 2, the first suspension frame 4 also includes the first pillar 41 that is vertically arranged on each guide seat 44, and the length direction of the first pillar 41 is consistent with the inner threaded hole of the first adjusting rod 61 and the guide seat 44. The axes are perpendicular, and the first strut 41 protrudes toward the position where the second suspension frame 5 is located. In this embodiment, three guide seats 44 are provided, so three first pillars 41 are provided in parallel, and the three first pillars 41 are evenly distributed. As shown in Figure 3, the second suspension frame 5 also includes a second pillar 51 vertically arranged on each guide seat 54 and aligned with the first pillar 41, the length direction of the second pillar 51 is aligned with the first adjusting rod 61 and The axes of the internally threaded holes of the guide seat 54 are perpendicular to each other, and the second pillar 51 protrudes toward the position where the first suspension frame 4 is located. In this embodiment, three guide seats 54 are provided, and then three second pillars 51 are provided in parallel, and the three second pillars 51 are evenly distributed. As shown in Fig. 1 and Fig. 4, the first pillar 41 and the second pillar 51 are connected through the connecting piece 1, and the first pillar 41 and the second pillar 51 are threadedly connected with the connecting piece 1, and the middle connecting piece 1 has The threaded holes for inserting the first pillar 41 and the second pillar 51 are threaded for easy assembly and disassembly.

As shown in Figure 7, the adjustment assembly 6 is arranged on the guide seats 44, 54, the guide seats 44, 54 have three rods, wherein the two opposite rods respectively have an internally threaded hole connected with a stud, The third rod located in the middle of these two rods is provided with an internally threaded hole threadedly connected with the first adjusting rod 61 and a guide hole for inserting the second adjusting rod 62, the guide hole communicates with the internally threaded hole , to ensure that the first adjusting rod 61 can be introduced into the guide hole and connected with the second adjusting rod 62 . The guide hole guides the second adjustment rod 62, and the second adjustment rod 62 performs a reciprocating linear motion in the guide hole. One end of the second adjustment rod 62 is inserted into the guide hole, and the other end extends out of the guide hole and is positioned on the first suspension frame. 4 or the inside of the second suspension frame 5, the hinge 63 is installed on the extended end of the second adjusting rod 62. A part of the first adjusting rod 61 is inserted into the guide seat 44 , 54 , and the other part is located outside the guide seat 44 , 54 .

The main advantages of the design of the first suspension frame, the second suspension frame, and the suspension assembly of the above structure are as follows: 1) It is convenient to adjust and disassemble the entire vibration isolation platform, and the adjustment can expand the size and weight range of the vibration isolation objects of the platform, making it flexible Disassembly can make the platform easy to move and transport; 2) The structural design of the whole platform can easily produce series products, which is convenient for the modularized and serialized production of the platform.

The following describes in detail how to achieve the quasi-zero stiffness of the vibration isolation platform. The specific steps are:

Step 1: first calculate the deformation of the damping spring (non-linear spring) 22 when the moving platform 3 is subjected to an external excitation force and reaches the static equilibrium position.

Step 2: According to the amount of deformation of the damping spring (non-linear spring) 22 when the placed object reaches the static equilibrium position, adjust the pre-compression amount of the shock absorber connected with the adjustment assembly 6 arranged on the first suspension frame 4 to make the damping spring The preload of the shock absorber points towards the lower end cap of the spring along the shock absorber. The damping spring 22 on the shock absorber will produce positive stiffness when the moving platform 3 moves downward.

Step 3: adjust the deformation amount of the damping spring (non-linear spring) 22 of the shock absorber connected with the adjustment assembly 6 arranged on the second suspension bracket 5, thereby adjusting the pre-compression amount of the shock absorber to make the shock absorber The preload points down the shock. The damping spring 22 on the shock absorber will produce negative stiffness when the moving platform 3 moves downward.

The positive stiffness generated by the shock absorber connected with the adjustment assembly 6 arranged on the first suspension frame 4 and the negative stiffness generated by the shock absorber connected with the adjustment assembly 6 arranged on the second suspension frame 5 are added numerically The total stiffness of the entire vibration damping system can be realized to be zero, thereby realizing an adjustable zero-stiffness vibration isolation platform with positive and negative stiffness.

The utility model has been exemplarily described above in conjunction with the accompanying drawings. Apparently, the specific implementation of the present invention is not limited by the above methods. As long as the various insubstantial improvements made by adopting the method concept and technical solution of the present utility model; within the scope of protection.

Claims (9)

1. the adjustable quasi- zero stiffness vibration-isolating platform of positive negative stiffness, it is characterised in that include：

Moving platform；

Suspension assembly；

Vibroshock, which is connected with moving platform；And

Adjusting part, which is connected with suspension assembly and vibroshock, and for adjusting the initial position of vibroshock.

2. the adjustable quasi- zero stiffness vibration-isolating platform of positive negative stiffness according to claim 1, it is characterised in that the regulation group Part includes with the suspension assembly is threaded connection the first adjusting rod and be to be threadedly coupled and relative can hang with the first adjusting rod Hanging component makees the second adjusting rod of linear reciprocating motion, and the second adjusting rod is connected to rotate with the vibroshock.

3. the adjustable quasi- zero stiffness vibration-isolating platform of positive negative stiffness according to claim 2, it is characterised in that described first adjusts It is two sections of external screw threads being threadedly coupled respectively with the suspension assembly and second adjusting rod that pole has, and two sections externally threaded It is oppositely oriented.

4. the adjustable quasi- zero stiffness vibration-isolating platform of positive negative stiffness according to claim 1, it is characterised in that the suspension group Part includes being equipped with the first hanger bracket for being oppositely arranged and being connected and the second hanger bracket, the first hanger bracket and the second hanger bracket On the adjusting part, the first hanger bracket and the second hanger bracket, set adjusting part passes through the vibroshock and the moving platform Connection.

5. the adjustable quasi- zero stiffness vibration-isolating platform of positive negative stiffness according to claim 4, it is characterised in that the vibroshock It is circumferentially distributed multiple in the inner side of the suspension assembly, and in two adjacent vibroshocks, one of vibroshock and institute State the adjusting part connection arranged on the first hanger bracket, arrange on another vibroshock and second hanger bracket described in Adjusting part connects.

6. the adjustable quasi- zero stiffness vibration-isolating platform of positive negative stiffness according to claim 5, it is characterised in that the vibroshock Centered on the axis of the moving platform, line is evenly distributed around moving platform.

7. the adjustable quasi- zero stiffness vibration-isolating platform of positive negative stiffness according to claim 4, it is characterised in that described first hangs Hanger has the first pillar, second hanger bracket with the second pillar alignd with the first shore position, the first pillar and the Two pillars are connected by middle connector.

8. the adjustable quasi- zero stiffness vibration-isolating platform of positive negative stiffness according to claim 7, it is characterised in that described first Post and second pillar to be threadedly coupled, have in middle connector and allow the first pillar and the second pillar to revolve with the middle connector The screwed hole for entering.

9. according to the arbitrary described adjustable quasi- zero stiffness vibration-isolating platform of positive negative stiffness of claim 4 to 8, it is characterised in that institute It is hexagonal structure to state the first hanger bracket and second hanger bracket.