阅读说明：本技术 一种液压挖掘机管路三向多层阻尼减振装置及匹配方法 (Three-way multilayer damping vibration attenuation device for hydraulic excavator pipeline and matching method ) 是由 田超 李凯 徐玉兵 宋士超 刘恩亮 于 2021-10-20 设计创作，主要内容包括：本发明公布了一种液压挖掘机管路三向多层阻尼减振装置及匹配方法,包括安装支架,安装支架一半部通过螺栓安装在管路上,另一半部内设置减振组件,减振组件与安装支架间还设置有弹性片；所述减振组件包括壳体、双层弹性元件和三层阻尼元件,双层弹性元件和三层阻尼元件通过卡扣组件固定安装在壳体内。本发明实现三个方向多自由度减振,通过增加多层阻尼可以有效提高减振效果,增加减振带宽；另一方面,本发明所述减振装置方便拆卸,并提供了一种快速匹配方法用于减振装置匹配；通过本方法有效快速的对不同管路匹配最有效的多层阻尼吸振器,可以有效降低管路振动,从而提升管路的可靠性。(The invention discloses a three-way multilayer damping vibration attenuation device for a hydraulic excavator pipeline and a matching method, wherein the device comprises an installation support, one half part of the installation support is installed on the pipeline through a bolt, a vibration attenuation component is arranged in the other half part of the installation support, and an elastic sheet is also arranged between the vibration attenuation component and the installation support; the vibration reduction assembly comprises a shell, a double-layer elastic element and a three-layer damping element, wherein the double-layer elastic element and the three-layer damping element are fixedly arranged in the shell through a buckle assembly. The invention realizes multi-degree-of-freedom vibration attenuation in three directions, can effectively improve the vibration attenuation effect by increasing multilayer damping, and increases the vibration attenuation bandwidth; on the other hand, the vibration damper is convenient to disassemble, and a quick matching method is provided for matching the vibration damper; the method can effectively and quickly match the most effective multilayer damping vibration absorbers for different pipelines, and can effectively reduce the pipeline vibration, thereby improving the reliability of the pipeline.)

1. A three-way multilayer damping vibration attenuation device for a hydraulic excavator pipeline is characterized by comprising a mounting bracket, wherein one half part of the mounting bracket is mounted on the pipeline through a bolt, a vibration attenuation component is arranged in the other half part of the mounting bracket, and an elastic sheet is arranged between the vibration attenuation component and the mounting bracket;

the vibration reduction assembly comprises a shell, a double-layer elastic element and a three-layer damping element, wherein the double-layer elastic element and the three-layer damping element are fixedly arranged in the shell through a buckle assembly.

2. The hydraulic excavator pipeline three-way multi-layer damping vibration attenuation device as recited in claim 1, wherein a viscous fluid is disposed within said housing.

3. The hydraulic excavator pipeline three-way multi-layer damping vibration attenuation device as claimed in claim 1, wherein the double-layer elastic element is two springs.

4. The hydraulic excavator pipeline three-way multi-layer damping vibration attenuation device as claimed in claim 2, wherein the three-layer damping element comprises a mass block and two vibration attenuation pads, the mass block is arranged between the two springs, and the vibration attenuation pads are respectively arranged at two ends of the two springs.

5. The hydraulic excavator pipeline three-way multi-layer damping vibration damper as claimed in claim 4, wherein a spiral diversion hole is formed in the outer side of the mass block, and the spiral diversion hole is the same as the extending direction of the shell.

6. The hydraulic excavator pipeline three-way multi-layer damping vibration attenuation device as claimed in claim 1, wherein a sealing cover is further arranged between the buckle and the shell.

7. The hydraulic excavator pipeline three-way multi-layer damping vibration attenuation device as claimed in claim 6, wherein the sealing cover is provided with external threads, and the housing and the corresponding assembling section of the sealing cover are provided with internal threads.

8. The hydraulic excavator pipeline three-way multi-layer damping vibration attenuation device as claimed in claim 6, wherein a first boss is provided at the end of the housing, and a second boss matched with the first boss is provided at the end of the sealing cover.

9. A method for matching a hydraulic excavator pipeline three-way multi-layer damping vibration damper as claimed in any one of claims 1 to 8, comprising the steps of:

finding out the maximum vibration frequency of the pipeline according to the acceleration data of the pipelinef _max；

According to maximum vibration frequencyf _maxThe spring stiffness coefficient K of the dynamic vibration absorber is obtained,

K=m×(2πf _max)²，

wherein m is the mass of the spring;

the stiffness coefficient of a single spring is solved according to the stiffness coefficient of the system, the spring is selected,

K₁=K₂=2K，

wherein K₁And K₂Is the stiffness coefficient of each spring.

10. Matching method according to claim 9, characterized in that the matching spring can be selected directly from the vibration frequency-standard spring look-up table.

Technical Field

The invention relates to a three-way multilayer damping vibration attenuation device for a hydraulic excavator pipeline and a matching method, and belongs to the technical field of structural vibration attenuation of hydraulic excavators.

Background

Hydraulic shovel is now by the wide application in each aspect of our life, has a lot of pipelines among the hydraulic shovel, including hydraulic line, condenser tube etc. hydraulic shovel also can produce the vibration at the working process pipeline, and especially hydraulic line is the key part of excavator, and under broken operating mode, hydraulic system strikes great, leads to hydraulic line vibration big, and the vibration can produce dynamic deformation and dynamic stress, and these deformation and stress can arouse the fatigue failure of hydraulic line and hydraulic line support. The vibration of the hydraulic pipeline is a main reason for the failure of the hydraulic pipeline, so that the vibration reduction of the hydraulic pipeline is a key measure for improving the reliability of a hydraulic system.

Vibration control can be classified into three categories, vibration source suppression, vibration isolation, and vibration absorption. Wherein the vibration suppressing source directly suppresses the energy output of the vibration source; the vibration isolation is to isolate the vibration source and the affected equipment by a vibration isolation device and attenuate the transmission of vibration energy; vibration absorption is realized by adding a special elastic-mass device on an affected device to form a master-slave vibration system, and the vibration response of the affected device is reduced by adjusting the natural frequency of the spring-mass device and absorbing the vibration energy of the system.

The dynamic vibration absorber: an apparatus for absorbing vibrational energy of a body using a resonant system to reduce vibration of the body. The principle is that a mass spring resonance system is added on a vibrating object, and the reaction force generated by the additional system during resonance can reduce the vibration of the vibrating object. The prior art is mostly a single-degree-of-freedom spring-mass system, and only one-way vibration reduction can be realized; in order to increase the vibration reduction frequency bandwidth, certain damping can be added, the damping is single damping, and a single-layer damping can increase certain vibration reduction bandwidth on the basis of the undamped dynamic vibration absorber, but the vibration reduction effect is not enough.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a hydraulic excavator pipeline three-way multilayer damping vibration attenuation device with quick energy dissipation and good vibration attenuation effect and a matching method.

In order to solve the technical problems, the invention is realized by adopting the following technical scheme:

a three-way multilayer damping vibration attenuation device for a hydraulic excavator pipeline comprises a mounting bracket, wherein one half part of the mounting bracket is mounted on the pipeline through a bolt, a vibration attenuation component is arranged in the other half part of the mounting bracket, and an elastic sheet is arranged between the vibration attenuation component and the mounting bracket;

the vibration reduction assembly comprises a shell, a double-layer elastic element and three layers of damping elements, wherein the double-layer elastic element and the three layers of damping elements are fixedly arranged in the shell through a buckle assembly.

Further, a viscous fluid is disposed within the housing.

Further, the double-layer elastic element is two springs.

Furthermore, the three-layer damping element comprises a mass block and two damping pads, the mass block is arranged between the two springs, and the damping pads are respectively arranged at two ends of the two springs.

Furthermore, the outer side of the mass block is provided with a spiral flow guide hole which is the same as the extension direction of the shell.

Furthermore, a sealing cover is arranged between the buckle and the shell.

Furthermore, the sealing cover is provided with external threads, and the shell and the corresponding assembling section of the sealing cover are provided with internal threads.

Further, the end part of the shell is provided with a first boss, and the end part of the sealing cover is provided with a second boss matched with the first boss.

The invention also provides a matching method of the hydraulic excavator pipeline three-way multilayer damping vibration attenuation device, which is characterized by comprising the following steps of:

finding out the maximum vibration frequency of the pipeline according to the acceleration data of the pipelinef _max；

According to maximum vibration frequencyf _maxThe spring stiffness coefficient K of the dynamic vibration absorber is obtained,

K=m×(2πf _max)²，

wherein m is the mass of the spring;

the stiffness coefficient of a single spring is solved according to the stiffness coefficient of the system, the spring is selected,

K₁=K₂=2K，

wherein K₁And K₂Is the stiffness coefficient of each spring.

Furthermore, according to the vibration frequency-standard spring comparison table, a matched spring can be directly selected.

Compared with the prior art, the invention has the following beneficial effects:

(1) the multi-layer damping spring-mass damping system is formed by fixedly installing the damping device provided with the double-layer elastic element and the three-layer damping element on the pipeline, so that multi-degree-of-freedom vibration damping in three directions can be realized, the multi-layer damping is increased, the vibration damping effect can be effectively improved, and the vibration damping bandwidth is increased;

(2) viscous fluid is filled in the shell, so that the damping effect of each element in the damping assembly can be enhanced;

(3) the spiral flow guide holes which are the same as the extension direction of the shell are formed in the outer side of the mass block, so that the flowability of the viscous fluid in the shell can be further enhanced, and the vibration absorption effect of the vibration absorption device is enhanced.

Drawings

FIG. 1 is a schematic view of the installation of the damping device of the present invention;

FIG. 2 is a longitudinal cross-sectional view of the vibration damping device of the present invention;

FIG. 3 is an exploded view of the structure of the damping assembly of the present invention;

FIG. 4 is a block diagram of the damping assembly of the present invention;

fig. 5 is a schematic diagram of a prior art dynamic vibration absorber;

FIG. 6 is a schematic view of the damping device of the present invention;

fig. 7 is a flow chart of a method of matching the vibration damping device.

In the figure: a pipeline 1; a mounting bracket 2; a bolt 3; a damping assembly 4; a housing 41; a first boss 411; a buckle 42; a spring 43; a vibration damping pad 44; a mass block 45; flow guide holes 451; a seal cap 46; a second boss 461; an elastic sheet 5.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

Example 1

As shown in fig. 1, in one embodiment, a three-way multilayer damping vibration attenuation device for a hydraulic excavator pipeline 1 comprises a mounting bracket 2, wherein the mounting bracket 2 is in a butterfly shape, one half part of the mounting bracket is fixedly clamped on the pipeline 1 through bolts 3, a vibration attenuation component 4 is arranged in the other half part of the mounting bracket, and the vibration attenuation component 4 and the pipeline 1 are firmly fixed together through fastening of the bolts 3.

As shown in fig. 2, an elastic sheet 5 is further disposed between the vibration damping assembly 4 and the mounting bracket 2, the elastic sheet 5 is a sheet structure with a certain radian, and the vibration damping assembly 4 as a mass body and the elastic sheet 5 form a set of spring-mass system for absorbing radial vibration of the pipeline.

As shown in fig. 3 and 4, the vibration damping module 4 includes a housing 41, a double-layer elastic element and a triple-layer damping element, the double-layer elastic element and the triple-layer damping element are fixedly installed in the housing 41 by a buckle 42, and the buckle 42 is disposed at an opening at an end of the housing 41. Wherein the double-layer elastic element is preferably two springs 43 with the same stiffness coefficient, the triple-layer damping element comprises a mass 45 and two damping pads 44, the mass 45 is arranged between the two springs 43, and the damping pads 44 are respectively arranged at two ends of the two springs 43. According to the installation direction of FIG. 4, the structure of the damping pad 44-the spring 43-the mass 45-the spring 43-the damping pad 44 is sequentially from right to left.

To enhance the damping effect of the various components within the damping assembly 4, a viscous fluid is poured into the housing 41, and a sealing cap 46 is provided between the damping pad 44 and the catch 42 to prevent the internal viscous fluid from escaping during operation. Meanwhile, in order to prevent the buckle 42 from loosening with the shell 41 and further prevent the internal viscous fluid from overflowing, and prolong the service life of the damping device, the following two improvement modes are adopted: (1) an external thread is arranged on the outer side of the sealing cover 46, and an internal thread is arranged on the corresponding assembling section of the shell 41 and the sealing cover 46; (2) the end of the housing 41 is provided with a first boss 411, the end of the sealing cover 46 is provided with a second boss 461 matched with the first boss 411, the outward protruding parts of the first boss 411 and the second boss 461 are flush, and the buckle 42 can be conveniently buckled on the two overlapped bosses.

As shown in fig. 3, in order to further enhance the fluidity of the viscous fluid in the housing 41 and enhance the vibration absorbing effect of the vibration damping device, a spiral flow guiding hole 451 with the same extending direction as the housing 41 is formed in the outer side of the mass 45, during the operation of the vibration damping device, the mass 45 moves linearly in the housing 41, the viscous fluid flows through the spiral flow guiding hole 451 in the outer side of the mass 45, energy dissipation is generated, the viscous damping effect is achieved, and the viscous damping can be adjusted by changing the inclination and the aperture of the spiral flow guiding hole 451.

As shown in FIG. 5, most of the prior art is a single-degree-of-freedom spring 43-mass system, and only one-way vibration reduction can be realized; certain damping can be added for increasing the damping frequency bandwidth, the damping is single damping, a single-layer damping can increase certain damping bandwidth on the basis of the undamped dynamic vibration absorber, but the damping effect is not enough; in the prior art, the dynamic vibration absorber is realized by changing the rigidity in order to adjust the vibration reduction frequency, and the rigidity of the spring 43 system is adjusted by an active control system, but the method is high in cost.

As shown in FIG. 6, the stiffness coefficients of the two springs 43 in the axial direction are K₁And K₂The damping coefficients of the two damping pads 44 are C₁And C₂The middle is damping coefficient C₃The mass block 45 forms three layers of damping, and can play a role in broadband vibration reduction; the spring 43 has a stiffness coefficient K in the radial direction₃Damping coefficient of C₄。

Example 2

The invention also provides a matching method of the vibration damper in embodiment 1, comprising the following steps:

firstly, according to the acceleration data of the pipeline 1, the maximum vibration frequency of the pipeline 1 is found out by using a portable vibration frequency testerf _max；

According to maximum vibration frequencyf _maxThe stiffness coefficient K of the spring 43 of the dynamic vibration absorber is determined,

K=m×(2πf _max)²，

where m is the mass of the spring 43.

Then, the stiffness coefficient of a single spring 43 is solved according to the system stiffness coefficient, and the spring 43 is selected;

K₁=K₂=2K，

wherein K₁And K₂Is the stiffness coefficient of each spring 43.

According to a large number of matching experiments, the invention also designates a vibration frequency-spring 43 model matching table, and can directly select a proper spring 43 according to the measured maximum vibration frequency to match the vibration damper.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.