A vibration damping device for a telescopic boom of an engineering apparatus

Abstract

The utility model provides a kind of engineering equipment telescopic arm vibration damping device, belong to telescopic arm technical field. Including base section, movable section and damping mechanism. Movable section slidingly embedded in base section, the mounting bottom plate on it is fixed with slide rail, and damping mechanism is installed by slide rail. The mechanism core is the sealing shell of built-in asymmetric mass, torsional spring and damping liquid. Innovatively, frequency adjustment connecting rod and linear spring are used to convert the telescopic displacement of movable section relative to base section into the adjustment of torsional spring pre-tightening force, so as to change the natural frequency of damping mechanism and realize the real-time matching of frequency change after the telescopic arm is telescoped. At the same time, asymmetric mass can synchronously generate inertia force and torque to suppress bending and torsional vibration.

Description

Technical Field

[0001] This utility model belongs to the field of telescopic boom technology, and more specifically, it relates to a vibration damping device for telescopic booms of engineering equipment. Background Technology

[0002] In the field of construction machinery, such as cranes and pump trucks, the boom systems typically employ multi-section telescopic structures to adapt to different operational needs. However, during telescopic and load-bearing operations, especially in long cantilever conditions, the boom is prone to significant bending and torsional vibrations due to external excitation or its own movement. These vibrations not only affect operational accuracy and riding comfort but also accelerate structural fatigue and threaten operational safety. However, in practical applications, traditional vibration reduction methods, such as installing tuned mass dampers with fixed parameters, often only achieve optimal vibration reduction effects at specific boom lengths (i.e., specific structural frequencies). When the boom extends or retracts to change its length, the natural frequency of the structure changes accordingly, causing the fixed-parameter damper to become detuned, resulting in a sharp decline in vibration reduction effectiveness.

[0003] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided a vibration damping device for telescopic booms of engineering equipment, in order to achieve a more practical purpose. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a vibration damping device for the telescopic boom of engineering equipment, thereby resolving the issues raised in the background art.

[0005] The purpose and effectiveness of this utility model's engineering equipment telescopic boom vibration damping device are achieved through the following specific technical means: A vibration damping device for a telescopic boom of engineering equipment includes a base section, a movable section, and a damping mechanism. The base section includes a base shell, and a base section hinge support is installed on the inner wall of the base section shell. The movable section includes a movable shell, which is slidably embedded in the base shell. A mounting base plate is fixedly installed on the longitudinal center line of the upper end of the movable shell by bolts. Two sets of slide rails are fixedly installed on the mounting base plate. The damping mechanism is slidably installed on the movable shell via the slide rails. The damping mechanism can move axially along the slide rails of the movable section. The damping mechanism includes a frequency adjustment link and a linear spring. The frequency adjustment link and the linear spring can convert the telescopic movement of the movable section relative to the base section into adjustment of the internal stiffness of the damping mechanism.

[0006] Furthermore, the length of the slide rail is less than the extension stroke of the movable section, and the surface of the slide rail has a high gloss finish. Both ends of the slide rail are provided with end blocks.

[0007] The advantages of adopting the above-mentioned further solutions are that the smoothness of the slide rail can reduce friction, while the installation and use of the end stop can limit the range of motion of the slider and prevent it from falling out, and the linear slide rail ensures the smoothness and linearity of the damper's movement.

[0008] Furthermore, the mounting base plate is a rectangular steel plate used to rigidly fix the entire slide rail assembly to the center line position of the upper surface of the movable boom.

[0009] The beneficial effects of adopting the above-mentioned further solutions are as follows.

[0010] Furthermore, the shock absorption mechanism includes a housing body, which is a sealed, rectangular box made of aluminum alloy. The bottom of the housing body is provided with a slider that is slidably connected to a slide rail, and the top of the housing body is provided with a damping fluid injection port, the inside of which is provided with a sealing plug.

[0011] The advantages of adopting the above-mentioned further solutions are that the outer shell body made of aluminum alloy casting can reduce weight, the setting of the damping fluid injection port is used to fill high viscosity silicon-based damping fluid, which provides the main viscous damping for the movement of the mass block, and the setting of the sealing plug helps to ensure the sealing of the outer shell body, effectively preventing dust and moisture intrusion, adapting to the harsh working environment of engineering machinery, and improving the service life of the device.

[0012] A main shaft bearing seat is provided at the center of the two inner walls of the outer shell. A mass block main shaft is rotatably mounted on the main shaft bearing seat. An asymmetric mass block is fixedly mounted on the mass block main shaft. The asymmetric mass block is a heavy metal block in the shape of a fan (with a central angle of about 120°). Its center of mass is located on the thicker side of the fan shape. Torsion springs are connected to both ends of the asymmetric mass block. The other ends of the two torsion springs are fixedly connected to the two main shaft bearing seats respectively.

[0013] The beneficial effect of adopting the above-mentioned further scheme is that by using an asymmetric mass block as the core inertial body for vibration absorption, its asymmetric structure enables it to generate coupled inertial torques during oscillation, suppressing multi-directional vibrations: when the boom undergoes bending vibration, the mass block oscillates; when the boom undergoes torsional vibration, the asymmetric mass block, due to its center of mass shift, will be subjected to an inertial torque and rotate. A single mass block simultaneously provides two forms of inertial force, effectively suppressing both bending and torsional vibration modes.

[0014] Furthermore, pre-tightening sliders are slidably installed on both sides of the outer shell body. The pre-tightening sliders can slide on the outer walls of both sides of the outer shell body, and their contact surfaces are provided with spherical grooves.

[0015] Furthermore, the frequency adjustment link is a slender telescopic rod with hinged balls at both ends. One end of the frequency adjustment link is hinged to the hinged support of the base section, and the other end is hinged to the preload slider. A linear spring is provided on the frequency adjustment link.

[0016] The beneficial effect of adopting the above-mentioned further scheme is that, through the setting of the frequency adjustment link and the linear spring, the extension and retraction motion (displacement signal) of the boom is directly converted into the adjustment of the internal stiffness of the damper. When the movable section of the boom extends, the movable section displaces relative to the base section. This relative displacement is transmitted through the frequency adjustment link, pushing the preload slider to move, thereby compressing the linear spring and increasing the constraint stiffness of the asymmetric mass block. According to the TMD principle f = 1 / (2π) * √(k / m), as the stiffness k increases, the natural frequency f of the damper increases accordingly, thus matching the change in its own natural frequency after the boom extends, achieving "tracking tuning".

[0017] Compared with the prior art, the present invention has the following beneficial effects: This type of vibration damping device for the telescopic boom of engineering equipment adopts a high-smoothness slide rail and end stop design, ensuring the smoothness, straightness, and safety of the damping mechanism's movement and effectively preventing derailment. Secondly, the internal structure of the damping mechanism uses a sealed aluminum alloy box filled with high-viscosity silicon-based damping fluid, which not only reduces the overall weight but also provides excellent viscous damping and adaptability to harsh environments. Through the synergistic action of the asymmetric mass block, frequency adjustment linkage, and linear spring, diversified vibration suppression modes and adaptive frequency adjustment are achieved. The asymmetric mass block can simultaneously generate inertial force and inertial torque, effectively coupling and suppressing the bending and torsional vibrations of the boom; while the linkage mechanism converts the boom's telescopic displacement into adjustment of the torsional spring preload, thereby changing the damper's natural frequency in real time to match the boom's changing operating frequency, ensuring optimal vibration damping under different working conditions, and significantly improving the smoothness, accuracy, and structural lifespan of the engineering machinery. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of this utility model.

[0020] Figure 3 This is a cross-sectional view of the present invention.

[0021] Figure 4 This is a schematic diagram of the shock absorption mechanism of this utility model.

[0022] In the diagram, the correspondence between component names and drawing numbers is as follows: 100. Base section; 101. Base shell; 102. Base section hinge support; 200. Movable section; 201. Movable shell; 202. Mounting base plate; 203. Bolt; 204. Slide rail; 205. End stop; 300. Shock absorption mechanism; 301. Outer shell body; 302. Slider; 303. Main shaft bearing seat; 304. Damping fluid injection port; 305. Sealing plug; 306. Asymmetric mass block; 307. Mass block main shaft; 308. Torsion spring; 309. Frequency adjustment linkage; 310. Preload slider; 311. Linear spring; 312. Hinge ball. Detailed Implementation

[0023] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0024] Example As attached Figure 1 To be continued Figure 4 As shown: This utility model provides a vibration damping device for a telescopic boom of engineering equipment, including a base section 100, a movable section 200, and a damping mechanism 300. The base section 100 includes a base shell 101, and a base section hinge support 102 is installed on the inner wall of the base shell 100. The movable section 200 includes a movable shell 201, which is slidably embedded in the base shell 101. A mounting base plate 202 is fixedly installed on the longitudinal center line of the upper end of the movable shell 201 by bolts 203. Two sets of slide rails 204 are fixedly installed on the mounting base plate 202. The damping mechanism 300 is slidably installed on the movable shell 201 through the slide rails 204. The damping mechanism 300 can move axially along the slide rails 204 in the movable section 200. The damping mechanism 300 includes a frequency adjustment link 309 and a linear spring 311. The frequency adjustment link 309 and the linear spring 311 can convert the telescopic movement of the movable section 200 relative to the base section 100 into adjustment of the internal stiffness of the damping mechanism 300.

[0025] The length of the slide rail 204 is less than the telescopic stroke of the movable section 200, and the surface of the slide rail 204 has a high gloss finish. Both ends of the slide rail 204 are equipped with end stops 205. The mounting base plate 202 is a rectangular steel plate used to rigidly fix the entire slide rail 204 assembly to the center line of the upper surface of the movable section 200 boom. The shock absorption mechanism 300 includes a housing body 301, which is a sealed, rectangular box made of cast aluminum alloy. A slider 302 is provided at the bottom of the housing body 301, which is slidably connected to the slide rail 204. A damping fluid injection port 304 is provided at the top of the housing body 301, and a sealing plug 305 is provided inside the damping fluid injection port 304.

[0026] A main shaft bearing seat 303 is located at the center of the two inner side walls of the outer shell 301. A mass block main shaft 307 is rotatably mounted on the main shaft bearing seat 303. An asymmetric mass block 306 is fixedly mounted on the mass block main shaft 307. The asymmetric mass block 306 is a heavy metal block in the shape of a fan (with a central angle of about 120°). Its center of mass is located on the thicker side of the fan shape. Torsion springs 308 are connected to both ends of the asymmetric mass block 306. The other ends of the two torsion springs 308 are fixedly connected to the two main shaft bearing seats 303 respectively.

[0027] Preload sliders 310 are slidably mounted on both sides of the outer casing 301. The preload sliders 310 can slide on the outer walls of both sides of the outer casing 301, and their contact surfaces are provided with spherical grooves. The frequency adjustment link 309 is a slender telescopic rod with hinged balls 312 at both ends. One end of the frequency adjustment link is hinged to the hinged support of the base section 100, and the other end is hinged to the preload slider 310. A linear spring 311 is provided on the frequency adjustment link.

[0028] The specific usage and function of this embodiment are as follows: When using this type of telescopic boom vibration damping device for engineering equipment, firstly, when the movable section 200 extends or retracts relative to the base section 100 to adjust the boom length, the movable housing 201 slides within the base housing 101. This extension and retraction motion directly acts on the frequency adjustment linkage 309, which extends or retracts accordingly, compressing or releasing the linear spring 311 on it, thereby driving the preload slider 310 to slide on the side wall of the outer shell 301. The movement of the slider 302 changes the preload on the torsion springs 308 at both ends of the asymmetric mass block 306, essentially adjusting the overall stiffness of the mass block swing system. According to the principle of tuned mass dampers, changes in system stiffness lead to changes in its natural frequency, enabling it to track and match its own structural frequency, which changes due to the change in boom length. Simultaneously, when the boom vibrates during operation, whether it is bending or torsional vibration, it is transmitted to the internal asymmetric mass block 306 through the outer shell 301. The mass block swings and rotates in the damping fluid. The coupled inertial force and inertial torque generated by its asymmetric structure will cancel out the external vibration and convert the vibration energy into the internal energy of the damping fluid for dissipation, thereby achieving a highly efficient and adaptive broadband vibration reduction effect.

Claims

1. A vibration damping device for a telescopic boom of engineering equipment, characterized in that... The system includes a base section (100), a movable section (200), and a damping mechanism (300). The base section (100) includes a base shell (101), and a base section hinge support (102) is installed on the inner wall of the base section shell. The movable section (200) includes a movable shell (201), which is slidably embedded in the base shell (101). A mounting base plate (202) is fixedly installed on the longitudinal center line of the upper end of the movable shell (201) by bolts (203). Two sets of... The slide rail (204) is used to slide the damping mechanism (300) onto the movable housing (201). The damping mechanism (300) can move axially along the slide rail (204) on the movable section (200). The damping mechanism (300) includes a frequency adjustment link (309) and a linear spring (311). The frequency adjustment link (309) and the linear spring (311) can convert the telescopic movement of the movable section (200) relative to the base section (100) into the adjustment of the internal stiffness of the damping mechanism (300).

2. The vibration damping device for the telescopic boom of engineering equipment as described in claim 1, characterized in that... The slide rail (204) is shorter than the extension stroke of the movable section (200), and the surface of the slide rail (204) has a high gloss. Both ends of the slide rail (204) are provided with end blocks (205).

3. The vibration damping device for the telescopic boom of engineering equipment as described in claim 1, characterized in that, The mounting base plate (202) is a rectangular steel plate used to rigidly fix the entire slide rail (204) assembly to the center line position of the upper surface of the movable section (200) boom.

4. The vibration damping device for the telescopic boom of engineering equipment as described in claim 1, characterized in that, The shock absorption mechanism (300) includes a housing body (301), which is a sealed, rectangular box made of aluminum alloy. The bottom of the housing body (301) is provided with a slider (302) that is slidably connected to a slide rail (204). The top of the housing body (301) is provided with a damping fluid injection port (304), and a sealing plug (305) is provided inside the damping fluid injection port (304).

5. The vibration damping device for the telescopic boom of engineering equipment as described in claim 4, characterized in that, The main body (301) has a main shaft bearing seat (303) at the center of the two inner side walls. A mass block main shaft (307) is rotatably mounted on the main shaft bearing seat (303). An asymmetric mass block (306) is fixedly mounted on the mass block main shaft (307). The asymmetric mass block (306) is a fan-shaped heavy metal block with its center of mass located on the thicker side of the fan shape. Torsion springs (308) are connected to both ends of the asymmetric mass block (306). The other ends of the two torsion springs (308) are fixedly connected to the two main shaft bearing seats (303) respectively.

6. The vibration damping device for the telescopic boom of engineering equipment as described in claim 4, characterized in that, The outer shell body (301) is slidably mounted on both sides of a pre-tightening slider (310). The pre-tightening slider (310) can slide on the outer walls of both sides of the outer shell body (301), and its contact surface is provided with a spherical groove.

7. The vibration damping device for the telescopic boom of engineering equipment as described in claim 1, characterized in that, The frequency adjustment link (309) is a slender telescopic rod with hinged balls (312) at both ends. One end of the frequency adjustment link is hinged to the base section (100) hinge support, and the other end is hinged to the preload slider (310). A linear spring (311) is provided on the frequency adjustment link.

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