CN204852123U - Zero accurate rigidity damping platform that can adjust in a flexible way - Google Patents

Abstract

The utility model discloses a flexibly adjustable quasi-zero stiffness vibration damping platform, which comprises a fixed platform, a moving platform, a vibration damping assembly and a thrust assembly; the vibration damping assembly is connected with the fixed platform and the dynamic platform, and the thrust assembly is arranged on the fixed platform It is used to apply thrust to the moving platform, and there are multiple thrust assemblies around the moving platform. The vibration damping platform of the utility model can realize the quasi-zero stiffness of the vibration damping platform at its static equilibrium position and the nonlinear stiffness near the static equilibrium position, and can solve the problem of traditional linear vibration isolation systems in isolating low-frequency or ultra-low-frequency vibrations. Solving the inherent contradictions that restrict traditional vibration isolation systems can also solve the difficult problem between low-frequency vibration transmission rate and high-frequency vibration attenuation rate.

Description

A Flexible Adjustable Quasi-Zero Stiffness Damping Platform

technical field

The utility model belongs to the technical field of the mechanical engineering field, relates to the vibration reduction and vibration isolation technology in the mechanical engineering, in particular to a vibration reduction platform with quasi-zero stiffness.

Background technique

According to the vibration theory, the initial vibration isolation frequency of the traditional passive vibration isolation system is the natural frequency of the system itself. times. If you want to achieve low-frequency, ultra-low-frequency and wide-frequency vibration isolation in the range of 0.5-70Hz, you can only reduce the natural frequency of the system itself, but the natural frequency of the system is related to the stiffness, and reducing the natural frequency requires reducing the system stiffness. The low stiffness of the system will lead to the increase of the deformation of the elastic elements, resulting in the weakening of the bearing capacity of the system and the emergence of new contradictions. At the same time, due to the needs of production development and scientific experiments, precision mechanical systems have higher and higher requirements for limiting vibration interference. In order to improve precision, the stiffness can only be increased, but the increase in stiffness will also increase the natural frequency of the system, which is not conducive to Vibration isolation in the range of times the natural frequency of the system. In order to overcome the contradiction between system stiffness and static displacement, the vibration isolation system should have high static stiffness and low dynamic stiffness at the same time. Higher static stiffness ensures greater bearing capacity of the system and smaller static displacement; lower dynamic stiffness ensures lower natural frequency of the system and better low-frequency vibration isolation effect. With the in-depth research on the vibration isolation system, it is found that the quasi-zero stiffness vibration isolation system has the excellent characteristics of high static and low dynamics, which can realize the system's low natural frequency and high stiffness (large bearing capacity).

Utility model content

The utility model provides a quasi-zero-stiffness vibration-isolation platform for vibration isolation in a wide frequency range that has both high static stiffness and low dynamic stiffness, and can realize quasi-zero stiffness characteristics and adjustable quasi-zero stiffness. .

In order to achieve the above purpose, the technical solution adopted by the utility model is: a flexibly adjustable quasi-zero stiffness vibration damping platform, including:

fixed platform;

moving platform;

a vibration damping assembly coupled to the fixed and moving platforms; and

The thrust assembly is arranged on the fixed platform and is used to apply thrust to the moving platform; multiple thrust assemblies are arranged around the moving platform.

The lower end of the damping assembly is rotatably connected to the fixed platform, and the upper end is inserted into the interior of the moving platform and connected to the moving platform.

The shock absorber assembly includes a shock absorber, a shock absorber spring, an upper spring seat arranged on the piston rod of the shock absorber and a lower spring seat arranged on the cylinder body of the shock absorber, and the shock absorber spring is sleeved on the shock absorber on the device and between the upper spring seat and the lower spring seat.

The lower end of the cylinder body of the shock absorber is rotatably connected to the fixed platform, and the upper spring seat is fixedly connected to the moving platform.

The inner center of the moving platform has a center hole for accommodating the damping assembly, and the upper spring seat is fixedly connected with the moving platform in the center hole.

The thrust assembly includes a thrust assembly seat arranged on the fixed platform and a movable push rod arranged on the thrust assembly seat.

The thrust assembly seat is a structure with openings at both ends and a hollow interior, and the thrust assembly also includes a thrust spring disposed in the inner cavity of the thrust assembly seat and an adjusting screw inserted into the thrust assembly seat and threadedly connected with the thrust assembly seat, The push rod is inserted into the thrust assembly seat, and the thrust spring is located between the push rod and the adjusting screw.

Inner spring seats located between the thrust spring and the adjustment screw, and between the thrust spring and the push rod are also provided in the inner cavity of the thrust assembly seat.

One end of the push rod is inserted into the thrust assembly seat, and the other end is provided with a roller in contact with the moving platform.

The outer surface of the moving platform has an arc-shaped surface in contact with the thrust assembly.

The beneficial effect that the damping platform of the present utility model has is:

1. By setting reasonable structural parameters, the quasi-zero stiffness of the vibration damping platform at its static equilibrium position and nonlinear stiffness near the static equilibrium position can be realized, which can solve the problem of traditional linear vibration isolation systems in isolating low-frequency or ultra-low-frequency vibrations ;

2. When vibrating with a slight amplitude (such as 1mm or even 0.1mm amplitude), the quasi-zero stiffness vibration isolator with inclined springs is used in the prior art because the swing angle of the inclined springs is too small, and the negative stiffness mechanism has not yet worked, resulting in a Less than expected vibration isolation effect. However, the damping platform of the utility model adopts a rolling ball mechanism instead of an oblique spring. When a slight vibration occurs, the negative stiffness mechanism can immediately intervene, thereby ensuring effective vibration isolation for the slight vibration.

3. The damping spring is easy to replace, that is, the stiffness of the system can be easily adjusted, which is suitable for vibration isolation of objects of different masses and has good engineering applicability;

4. The vibration damping platform has the excellent characteristics of high static and low dynamic, which can solve the inherent contradictions that restrict traditional vibration isolation systems, and can also solve the difficult problem between low-frequency vibration transmission rate and high-frequency vibration attenuation rate.

Description of drawings

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

Fig. 1 is the structural representation of the utility model damping platform;

Fig. 2 is the structural representation of fixed platform;

Fig. 3 is a structural schematic diagram of a thrust assembly;

Figure 4 is a sectional view of the thrust assembly;

Fig. 5 is a structural schematic diagram of a damping assembly;

Fig. 6 is a 1/4 sectional view of the moving platform;

Fig. 7 is a 1/4 sectional view of the mounting plate;

Labeled in the figure:

1. Base; 2. Support rod; 3. Support; 4. Bolt; 5. Thrust assembly seat; 6. Moving platform; 7. Bolt; 8. Upper spring seat; 9. Damping spring; 10. Adjusting screw; 11. Lower spring seat; 12. Adjusting ring; 13. External thread; 14. Mounting hole; 15. Bolt; 16. Radial plate; 17. Hinge seat; , roller shaft; 22, inner spring seat; 23, thrust spring; 24, inner spring seat; 25, installation hole; 26, nut; 27, shock absorber; 28, contact surface; 29, center hole; 30, counterbore ; 31, threaded hole; 32, threaded hole; 33, mounting plate; 34, counterbore; 35, T-shaped slot;

Detailed ways

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 flexibly adjustable quasi-zero-stiffness damping platform, including a fixed platform, a moving platform 6, a damping assembly and a thrust assembly. The damping assembly is connected with the fixed platform and the moving platform 6, the thrust assembly is arranged on the fixed platform, and the thrust assembly is used to apply thrust to the moving platform 6, and there are multiple thrust assemblies around the moving platform 6.

Specifically, the moving platform 6 is vertically movable relative to the fixed platform, and the moving platform 6 is used to carry vibration-isolated objects. As shown in Figures 1 and 2, the fixed platform includes a base 1, a web 16 connected to the base 1, and a support rod 2 connected to the web 16, and the lower end of the damping assembly is connected to the base 1 at the center of the base 1, The webs 16 and support rods 2 are arranged in multiples around the base 1 . The support rod 2 is used for installing the thrust assembly. In this embodiment, the support rod 2 is a U-shaped structure with an opening facing the thrust assembly. The web 16 is used to connect the support rod 2 and the base 1 to form a fixed platform with an integral structure. When the web 16 extends horizontally, the lower end of the support rod 2 is fixedly connected to the end of the web 16 , the other end of the web 16 is fixedly connected to the base 1 , and the thrust assembly is fixedly connected to the upper end of the support rod 2 .

As shown in FIG. 1 , the lower end of the damping assembly is rotatably connected to the base 1 of the fixed platform, and the upper end is inserted into the interior of the moving platform 6 and connected to the moving platform 6 . As shown in Figure 6, the inner center of the moving platform 6 has a central hole 29 for accommodating the damping assembly, and the central hole 29 is a circular hole. When the moving platform 6 and the damping assembly were in a vertical state above the base 1, the The central line and the axis of the central hole 29 of the moving platform 6 are located on the same straight line.

As shown in FIG. 6 , the central hole 29 in the moving platform 6 extends to the bottom surface of the moving platform 6 , and an opening for the vibration damping assembly to pass is formed on the bottom surface. A circular counterbore 30 is provided on the top surface of the moving platform 6 , and the counterbore 30 communicates with the central hole 29 and the two are coaxial.

As shown in Figures 1 and 5, the shock absorber assembly includes a shock absorber 27, a shock absorber spring 9, an upper spring seat 8 arranged on the piston rod of the shock absorber 27, and an upper spring seat 8 arranged on the cylinder body of the shock absorber 27. The lower spring seat 11 and the damping spring 9 are sleeved on the shock absorber 27 and located between the upper spring seat 8 and the lower spring seat 11 , and the upper spring seat 8 and the lower spring seat 11 clamp the damping spring 9 . The structure of the shock absorber 27 is known to those skilled in the art, and will not be repeated here. The piston rod of the shock absorber 27 passes through the upper spring seat 8 , and the piston rod is provided with a nut 26 to realize the fixed connection between the piston rod and the upper spring seat 8 . The upper spring seat 8 is also arranged in the counterbore 30 on the top of the moving platform 6. The upper spring seat 8 is fixedly connected with the moving platform 6 through the bolt 7. The upper spring seat 8 is correspondingly provided with a mounting hole 25 for the bolt 7 to pass through. Correspondingly be provided with the threaded hole 31 that cooperates with bolt 7 in platform 6, upper spring seat 8 is coaxial with center hole 29 of moving platform 6. The lower spring seat 11 is sheathed on the cylinder body of the shock absorber 27 and is movable along the axial direction of the shock absorber 27 . Preferably, the shock absorber assembly also includes an adjusting ring 12 sleeved on the cylinder body of the shock absorber 27 and threadedly connected with the cylinder body. Correspondingly, an external thread 13 is provided on the outer surface of the cylinder body of the shock absorber 27. The inner wall of the adjustment ring 12 is provided with an internal thread matched with the external thread. The adjustment ring 12 is located below the moving platform 6, and the lower spring seat 11 is sandwiched between the adjustment ring 12 and the damping spring 9. By rotating the adjustment ring 12 on the cylinder body, the lower spring seat 11 can be raised or lowered, and the lower spring seat 11 can be adjusted. The distance between the seat 11 and the upper spring seat 8, that is, the elastic force of the damping spring 9 can be adjusted. The damping spring 9 is preferably a cylindrical coil spring, and is a compression spring.

As shown in Figure 1, the cylinder body of the shock absorber 27 is provided with a hinge seat 17 that is rotatably connected to the base 1 of the fixed platform. The pin shaft is correspondingly provided with a mounting hole 14 for the bolt 15 to pass through on the hinge seat 17; the axis of the mounting hole 14 is perpendicular to the axial direction of the shock absorber 27.

As shown in FIG. 1 and FIG. 4 , the thrust assembly includes a thrust assembly seat 5 arranged on the support rod 2 of the fixed platform and a movable push rod 37 arranged on the thrust assembly seat 5 . The thrust assembly seat 5 is a structure with both ends open and the interior is hollow, and the thrust assembly also includes a thrust spring 23 arranged in the inner chamber of the thrust assembly seat 5 and is inserted into the thrust assembly seat 5 at one end and is threadedly connected with the thrust assembly seat 5 The adjusting screw 10, the push rod 37 is inserted into the thrust assembly seat 5 and protrudes from the other end opening of the thrust assembly seat 5, and the thrust spring 23 is located between the push rod 37 and the adjustment screw 10. The thrust spring 23 is a compression spring, which is used to apply a thrust to the push rod 37 to move outward.

As preferably, as shown in Fig. 1 and Fig. 4, one end of the push rod 37 is inserted into the thrust assembly seat 5, and the other end is provided with a mounting frame 19 for installing the roller 20, and the roller 20 is installed on the mounting frame 19 through the roller shaft 21 . The roller 20 is a cylindrical structure, the roller 20 is located between the thrust assembly seat 5 and the moving platform 6 , and the roller 20 is used to contact the outer surface of the moving platform 6 . The roller 20 is rotatable on the mounting frame 19, and the axis of the roller shaft 21 is perpendicular to the axis of the circular cavity of the thrust assembly seat 5.

As shown in FIG. 4 , an inner spring seat 22 located between the thrust spring 23 and the adjusting screw 10 and an inner spring seat 24 located between the thrust spring 23 and the push rod 37 are also provided in the cavity of the thrust assembly seat 5 . A part of the adjusting screw 10 is inserted into the thrust assembly seat 5 and threaded therewith, and the other part is located outside the thrust assembly seat 5 . By turning the adjusting screw 10, the inner spring seat 22 can be moved axially in the thrust assembly seat 5, and the distance between the inner spring seat 22 and the inner spring seat 24 can be adjusted, that is, the elastic force of the thrust spring 23 can be adjusted. The thrust spring 23 is preferably a cylindrical coil spring, and is a compression spring.

As shown in FIG. 1 , the thrust assembly seats 5 are respectively arranged on one support rod 2 , and the axes of the thrust assembly seats 5 are parallel to the length direction of the web plate 16 below. The side wall of the thrust assembly seat 5 is provided with two supports 3, and the two supports 3 are fixedly connected with the vertical rods on both sides of the upper opening of the support rod 2 through bolts 4, so as to realize the fixed connection between the thrust assembly and the fixed platform.

As shown in FIG. 1 and FIG. 6 , the moving platform 6 has a square structure, and the central hole 29 is located at the inner center of the moving platform 6 . There are four thrust assemblies arranged around the moving platform 6 , and the four thrust assemblies are evenly distributed along the circumference around the centerline of the base 1 . The moving platform 6 has a top surface, a bottom surface and four contact surfaces 28 between the top surface and the bottom surface. Each thrust assembly is located outside one contact surface 28, and the rollers 20 of the thrust assembly are in contact with the contact surfaces 28. Preferably, the contact surface 28 is an arc surface with the bottom of the arc concave toward the interior of the moving platform 6, the axis of the contact surface 28 is parallel to the axial direction of the roller 20, and both are perpendicular to the centerline of the base 1 in space , the axis of the contact surface 28 is perpendicular to the axis of the central hole 29 in the moving platform 6 in space.

As shown in FIG. 1 , the vibration damping platform of the present invention also includes a mounting plate 33 fixed on the top surface of the moving platform 6 , and the mounting plate 33 is used for mounting the vibration-isolated object. In this embodiment, as shown in FIG. 7, T-shaped slots are provided on the top surface of the mounting plate 33, and six counterbores 34 are provided. The T-shaped slots are used for the installation of vibration-isolated objects, and the six counterbores 34 The mounting plate 33 is fixed on the moving platform 6 by the hexagon socket bolt 36. The number of T-shaped slots is set according to needs, and multiple T-shaped slots can be provided. In this embodiment, six T-shaped slots are arranged in parallel.

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 (10)

1. can the accurate zero stiffness vibration reduction platform of free adjusting, it is characterized in that, comprising:

Fixed platform;

Moving platform;

Damping assembly, it is connected with fixed platform and moving platform; And

Thrust assemblies, it is arranged on fixed platform, and for moving platform applied thrust; Thrust assemblies is provided with multiple around moving platform.

2. according to claim 1 can the accurate zero stiffness vibration reduction platform of free adjusting, it is characterized in that, lower end and the described fixed platform of described damping assembly are rotationally connected, and it is inner and be connected with moving platform that described moving platform is inserted in upper end.

3. according to claim 1 and 2 can the accurate zero stiffness vibration reduction platform of free adjusting, it is characterized in that, described damping assembly comprises vibration damper, shock-absorbing spring, the lower spring cup that is arranged at the upper spring seat on the piston rod of vibration damper and is arranged on the cylinder body of vibration damper, and shock-absorbing spring to be sheathed on vibration damper and between upper spring seat and lower spring cup.

4. according to claim 3 can the accurate zero stiffness vibration reduction platform of free adjusting, it is characterized in that, cylinder body lower end and the described fixed platform of described vibration damper are rotationally connected, and described upper spring seat is fixedly connected with described moving platform.

5. according to claim 4 can the accurate zero stiffness vibration reduction platform of free adjusting, it is characterized in that, the inside center of described moving platform has the center hole holding described damping assembly, and described upper spring seat is fixedly connected with moving platform in center hole.

6. according to claim 5 can the accurate zero stiffness vibration reduction platform of free adjusting, it is characterized in that, described thrust assemblies comprises the thrust assemblies seat be arranged on described fixed platform and the push rod be movably arranged on thrust assemblies seat.

7. according to claim 6 can the accurate zero stiffness vibration reduction platform of free adjusting, it is characterized in that, described thrust assemblies seat is the structure of both ends open, inner hollow, described thrust assemblies also comprise be arranged at thrust spring in thrust assemblies seat inner chamber and to insert in thrust assemblies seat and with the adjusting screw of thrust assemblies seat for being threaded, described push rod inserts in thrust assemblies seat, and thrust spring is between push rod and adjusting screw.

8. according to claim 7 can the accurate zero stiffness vibration reduction platform of free adjusting, it is characterized in that, in the inner chamber of described thrust assemblies seat, be also provided with the inner spring seat laid respectively between described thrust spring and described adjusting screw, between described thrust spring and described push rod.

9. according to claim 8 can the accurate zero stiffness vibration reduction platform of free adjusting, it is characterized in that, described push rod one end is inserted in described thrust assemblies seat, and the other end is provided with the roller contacted with described moving platform.

10. according to claim 9 can the accurate zero stiffness vibration reduction platform of free adjusting, it is characterized in that, the outer surface of described moving platform has the arc shaped surface contacted with described thrust assemblies.