CN205877050U - Tunable frequency's wide band dynamic vibration absorber - Google Patents

Abstract

The utility model discloses a frequency-adjustable broadband dynamic vibration absorber, which comprises a base, a screw rod vertically installed on the base, a fixed vibration-absorbing unit, at least one group of mobile vibration-absorbing units, a nut and a sliding metal plate, the fixed vibration-absorbing The unit includes a fixed mass block and a fixed rubber block connected by vulcanization, and each group of mobile vibration-absorbing units includes a moving mass block and a moving rubber block placed under the moving mass block, and is located on the uppermost moving mass block. The surface is provided with a rubber damping plate, the nut is threadedly installed on the screw rod to fix all rubber blocks and mass blocks axially on the base, and the sliding metal plate is slidably installed on the screw rod through a sleeve . The utility model is not only suitable for solving the abnormal vibration problem of the system or parts, but also suitable for the problem verification work in the vibration diagnosis process, which increases the use range of the vibration absorber and improves the working efficiency.

Description

A Broadband Dynamic Vibration Absorber with Adjustable Frequency

technical field

The utility model relates to a vibration and noise reduction device, in particular to a wide-frequency dynamic vibration absorber with adjustable frequency, which can be used for mechanical equipment (including vehicle bodies, machine tools, vehicle frames, etc.) that have abnormal vibration problems caused by resonance. Quick fix.

Background technique

Mechanical vibration will not only reduce the performance and reliability of the machine itself, but also cause damage to the human body, and it is also the cause of noise pollution. The vibration problem is largely caused by the insufficient damping of the mechanical structure. As a countermeasure, various dampers have been studied, the representative of which is the dynamic vibration absorber.

The dynamic vibration absorber is mainly composed of auxiliary mass, spring and damping. The various dynamic vibration absorbers currently used are mainly divided into the following two categories: 1. Generally, it is composed of a mass block and a rubber block. The disadvantage of this type of vibration absorber is that the vibration absorption frequency Single, can only solve the vibration caused by the resonance of a single mode of the structure; 2. Generally, it is composed of multiple mass blocks and multiple rubber blocks. The resonance of the main system can only be solved for the specific mode resonance problem of the structure. It has a single purpose and cannot quickly debug and identify the resonance problem according to the actual situation. It cannot flexibly adjust its own spring stiffness K and mass M, and it cannot add damping materials to enhance vibration absorption. damping characteristics.

In summary, the existing vibration absorbers have the following defects: single frequency, narrow resonance frequency band, single effective way to adjust the frequency of the vibration absorber, which is easy to cause resonance of the main system, and the current dynamic vibration absorber cannot flexibly adjust its own spring stiffness K and mass M, It can only solve the resonance problem of single structure or fixed mode, and has a single purpose.

Utility model content

The purpose of this utility model is to provide a frequency-adjustable broadband dynamic vibration absorber, which is not only suitable for solving the problem of abnormal vibration of the system or components, but also suitable for problem verification in the process of vibration diagnosis, increasing the scope of use of the vibration absorber ,Improved work efficiency.

The technical scheme that the utility model solves its technical problem adopts is:

A wide-band dynamic vibration absorber with adjustable frequency, the vibration absorber includes a base, a screw rod vertically installed at the center of the base, a fixed vibration-absorbing unit installed on the screw rod from bottom to top, at least one set of mobile vibration-absorbing units, Nuts and sliding metal plates, the fixed vibration-absorbing unit includes a fixed mass block and a fixed rubber block vulcanized and connected under the fixed mass block, each group of mobile shock-absorbing units includes a moving mass block and a block placed on the moving The moving rubber block below the mass block, the upper surface of the uppermost moving mass block is provided with a rubber damping plate, and the nut is threaded on the screw rod to fix all the rubber blocks and mass blocks axially on the On the base, the sliding metal plate is slidably installed on the screw rod through a sleeve.

According to the above technical solution, a sliding mass block is fixedly installed above the sliding metal plate.

According to the above technical solution, the sliding metal plate is welded on the outer periphery of the sleeve, and the sleeve is fixedly installed on the screw rod by bolts.

The utility model has the following beneficial effects: the utility model adopts a reasonable structural design, by adjusting the number of mobile vibration-absorbing units and adjusting the installation height of the sliding metal plate, the specifications of each group of moving mass blocks can be the same or different, so as to flexibly adjust Its own spring stiffness K and mass M can flexibly adjust the frequency of the dynamic vibration absorber, make the operating frequency range of the vibration absorber wider, and suppress the multi-order modal resonance of the main system, avoiding the simultaneous use of multiple vibration absorbers. Single-order and multi-order modal resonance problems provide quick solutions with far-reaching engineering implications. At the same time, the utility model also sets a rubber damping plate on the upper surface of the uppermost moving mass block, and different damping plates of different materials and thicknesses can realize different damping coefficients of the shock absorber.

In the utility model, the mobile vibration-absorbing unit can be removed. Because the main body of the vibration absorber uses a screw as a rod-shaped cantilever structure, by adjusting the position of the sliding metal plate on the screw (correspondingly adjusting the length of the cantilever) and adjusting the quality of the sliding mass, the two The method can realize the adjustable frequency of the vibration absorber, increase the frequency adjustment range, and ensure that the vibration absorption frequency of the vibration absorber is more accurate. In the utility model, the nut can also be eliminated, and all mass blocks and rubber blocks are axially fixed on the base directly through the sliding metal plate. At this time, the rubber damping plate is arranged on the upper surface of the sliding metal plate.

Description of drawings

The utility model will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

Fig. 1 is the structural representation of the utility model embodiment;

Fig. 2 is a cross-sectional view of an embodiment of the present invention.

In the figure: 1-screw, 2-sleeve, 3-bolt, 4-nut, 5-sliding mass, 6-sliding metal plate, 7-moving mass, 8-moving rubber block, 9-fixed mass , 10-fixed rubber block, 11-base.

detailed description

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

In a preferred embodiment of the present utility model, as shown in Fig. 1 and Fig. 2, a frequency-adjustable broadband dynamic vibration absorber includes a base 11, a screw 1 vertically installed at the center of the base 11, and a A fixed vibration-absorbing unit, at least one set of mobile vibration-absorbing units, a nut 4 and a sliding metal plate 6 are installed on the screw 1 in order from bottom to top. Rubber block 10, each group of mobile vibration-absorbing units includes a moving mass 7 and a moving rubber block 8 placed below the moving mass 7, the upper surface of the uppermost moving mass 7 is provided with a rubber damping plate, a nut 4 is installed on the screw rod 1 through threads so that all rubber blocks and mass blocks are axially fixedly installed on the base 11, and the sliding metal plate 6 is slidably installed on the screw rod 1 through the sleeve 2.

In a preferred embodiment of the present invention, as shown in Fig. 1 and Fig. 2 , a sliding mass 5 is fixedly installed above the sliding metal plate 6 for assisting in adjusting the frequency of the vibration absorber.

In the preferred embodiment of the present utility model, as shown in Fig. 1 and Fig. 2, the sliding metal plate 6 is welded on the outer periphery of the sleeve 2, and the sleeve 2 is fixedly installed on the screw rod 1 through the bolt 3.

As shown in Figure 1 and Figure 2, a vibration absorbing method based on the above-mentioned vibration absorber, when using the vibration absorber to solve the problem of structural multi-order modal resonance, includes the following steps:

S1. Firstly, the base 11 is fixedly installed on the structure generating the resonance problem;

S2. Set the fixed vibration-absorbing unit on the screw 1, and fix it on the base 11 through the nut 4, adjust the position of the sliding metal plate 6 on the screw 1 through the sleeve 2, and observe whether there is vibration. If the mode is not resolved Resonance problem, proceed to the next step;

S3. Take off the sliding metal plate 6 and the nut 4, place a group of mobile vibration-absorbing units above the fixed vibration-absorbing unit, that is, first add a mobile rubber block 8, then add a moving mass 7, and install the nut 4 to move the vibration-absorbing unit and the fixed vibration-absorbing unit are fixed on the base 11;

S4. Install the sliding metal plate 6, adjust the position of the sliding metal plate 6 on the screw rod 1 through the sleeve 2, and observe whether there is vibration. If the modal resonance problem is not solved, repeat step S3 until the modal resonance problem is solved.

In a preferred embodiment of the present invention, as shown in Figure 1 and Figure 2, when using the vibration absorber to solve the problem of a certain order modal resonance of the structure, the following steps are included:

S1, in the case of a given sliding mass 5:

S101, remove the mobile vibration absorbing unit of the vibration absorber, install the nut 4 to fix the fixed vibration absorbing unit on the base 11, fix the given sliding mass 5 on the top of the sliding metal plate 6, and place the sliding mass 5 The sliding metal plate 6 is installed on the bolt 3, and the base 11 is fixedly installed on the structure that generates resonance problems;

S102. Adjust the position of the sliding metal plate 6 on the screw 1 through the sleeve 2 until the resonance problem of a certain order mode of the structure is solved, and fix the sleeve and the screw 1;

S2. In the case of a given installation height of the sliding metal plate 6 on the screw rod 1:

S201. Remove the mobile vibration-absorbing unit of the vibration absorber, install the nut 4 to fix the fixed vibration-absorbing unit on the base 11, fix the sliding metal plate 6 on the given height of the bolt 3, and fix the base 11 on the place where the resonance problem occurs on the structure;

S202. Place sliding mass blocks 5 of different specifications on the sliding metal plate 6 until the resonance problem of a certain order mode of the structure is solved, and fix the sliding mass block 5 and the sliding metal plate 6 .

In a preferred embodiment of the present utility model, a rubber damping plate is provided on the upper surface of the fixed mass block 9 of the fixed vibration-absorbing unit as shown in FIG. 1 .

In the specific application of the utility model, the screw cantilever is used as the main structure of the shock absorber, the length of the cantilever of the rod-shaped structure can be adjusted, and the weight of the mass block of the shock absorber can be adjusted. In addition, moving rubber blocks and moving mass blocks can also be added. The combination of high-frequency vibration absorbers can effectively increase the vibration-absorbing frequency of the vibration absorber, and can effectively solve the multi-order modal resonance problem of the structure. In addition, the damping performance is improved by attaching the damping plate, and the vibration absorption performance of the shock absorber is improved.

When the utility model is in use, the base is first riveted or welded to the parts that cause problems, such as the vehicle body, frame, and machine tools where the vibration is relatively large, and the base is effectively connected to the main system (bolt riveting or welding can be used) Welding), the moving mass block can be fixed on the screw rod through the screw cap, or can be fixed on the screw rod through the sliding metal plate, the sliding metal plate is fixed on the screw rod through the bolt on the sleeve, and the sleeve is connected with the sliding metal plate by welding , and the sliding mass block on the sliding metal plate is fixed on the sliding metal plate by fixing pins or bolts, the fixed rubber block and the fixed mass block have holes corresponding to the positions of the screws, and the fixed rubber block and the fixed mass block are vulcanized. Connect with each other, and fix the fixed rubber block and the fixed mass block through the nut. The utility model adjusts the vibration absorber to the correct vibration absorption frequency and absorbs relatively large vibration energy generated by the resonance of the problematic component, thereby solving the problem of abnormal vibration and improving the service life of the component.

The shock absorber of the present utility model can carry out the following four adjustment modes.

The first type: with a rod-shaped cantilever structure as the main body, the length of the cantilever and the quality of the sliding mass can be adjusted. When only the sliding metal plate is adjusted, the characteristics of the rod-shaped cantilever structure are fully utilized: 1. Different cantilever lengths, different stiffness characteristics: In the case of a given mass block on the sliding metal plate, by adjusting the position of the sliding metal plate, that is, different cantilever lengths, different stiffnesses can be achieved, thereby achieving different vibration absorption frequencies; 2. At the fixed sliding metal plate position, that is, the fixed cantilever length In the case of , the vibration absorption frequency of the vibration absorber can also be adjusted by changing the quality of the mass block.

The second type: When it is necessary to solve the multi-order modal resonance problem of the structure, the moving rubber block can be installed on the fixed mass block below, and then the moving mass block can be added. If the modal resonance problem is not solved, the moving rubber block can be added and Move the mass block, and so on, and finally fix the added moving rubber block and the moving mass block by sliding the metal plate or screw cap. This adjustment method is mainly to flexibly adjust the spring stiffness K and mass M of the shock absorber itself. For example, when adding a moving rubber block and a moving mass, the fixed mass and the moving mass can provide the mass M required by the shock absorber. The rubber block provides the stiffness K required by the shock absorber. When the main system is in low-frequency mode resonance, the combination of the mass block and the rubber block converts the resonance energy of the main system into the heat energy of the rubber block and consumes it; when the main system is high When the mode is excited to generate resonance, you can continue to add moving rubber blocks and moving mass blocks. At this time, all mass blocks provide the mass M required by the vibration absorber, and all rubber blocks provide the stiffness K required by the vibration absorber. The new vibration absorber absorbs and forms a new The modal resonance energy of the system, and so on. The biggest feature of this method is that it can adjust the spring stiffness K and mass M by itself according to the specific vibration situation, avoiding that ordinary vibration absorbers can only solve the problem of single-structure or fixed-mode resonance, and can control the overall quality of the vibration absorber , give full play to the shock absorbing ability of the shock absorber.

The third type: On the basis of the first and second types, by attaching rubber damping plates to the moving mass, sliding metal plate, fixed mass, etc., the damping characteristics of the shock absorber can be increased, and the vibration absorption of the shock absorber can be further enhanced. Effect.

The fourth type: Combining the above three adjustment methods, the frequency absorption range of the vibration absorber is greatly increased, so that the vibration absorber can better absorb the vibration of the main system, and the application range is wider.

The utility model has the following advantages:

1. The main body adopts a rod-shaped cantilever structure. By adjusting the length of the cantilever and the quality of the sliding mass, these two methods realize the frequency adjustment of the vibration absorber, increase the frequency adjustment range, and ensure that the vibration absorption frequency of the vibration absorber is more accurate;

2. The damping plate can be attached to the moving mass, sliding metal plate, and fixed mass. The damping plates of different materials and thicknesses can realize different damping coefficients of the vibration absorber;

3. By adding moving rubber blocks and moving mass blocks, the spring stiffness K and mass M of the vibration absorber can be flexibly adjusted, which can inhibit the multi-order modal resonance of the main system and avoid the simultaneous use of multiple vibration absorbers. Single-order and multi-order modal resonance problems provide a quick solution, with far-reaching engineering significance;

4. The shape of the base and the length of the screw rod in the utility model can be made at will according to the shape of the main system and the installation space, and the position should be wide;

5. The utility model combines the advantages of the rod-shaped cantilever structure and the mainstream dynamic vibration absorber structure (rubber vibration absorption alone), with better use effect, more reliable durability and longer use time;

6. The mass-produced parts of this shock absorber can ensure the consistency of product quality and reduce the occurrence of defective products by adjusting the length of the cantilever rod and adding rubber and quality blocks, which is of great engineering significance;

7. The utility model can be applied to solve various problems related to vibration, and has a wide range of applications.

It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should belong to the protection scope of the appended claims of the present utility model.

Claims (3)

1. the broadband dynamic vibration absorber of a frequency-adjustable, it is characterised in that this bump leveller includes base (11), is vertically mounted on The screw rod (1) of described base (11) center, the fixing absorbing unit being sequentially arranged on described screw rod (1) from bottom to up, Least one set moves absorbing unit, nut (4) and sliding metal plate (6), and described fixing absorbing unit includes one piece of fixed mass Block (9) and one piece of sulfuration are connected to the fixing block rubber (10) below described fixed mass block (9), the often mobile absorbing unit bag of group Include one piece of moving mass block (7) and one piece of mobile block rubber (8) being placed on described moving mass block (7) lower section, be positioned at and go up most The upper surface of one piece of moving mass block (7) of side is provided with rubber damping plate, and described nut (4) is by being threadably mounted at described screw rod (1) all block rubbers and mass to be axially installed on base (11) on, described sliding metal plate (6) passes through sleeve (2) it is slidably mounted on described screw rod (1).

Bump leveller the most according to claim 1, it is characterised in that fixed above being provided with of described sliding metal plate (6) Moving mass (5).

Bump leveller the most according to claim 1, it is characterised in that described sliding metal plate (6) is welded on described sleeve (2) Periphery, described sleeve (2) is fixedly mounted on described screw rod (1) by bolt (3).