Observation cylinder with tuned mass damping function

Abstract

The utility model relates to the technical field of rail transit floating slab ballast beds, in particular to an observation cylinder with a tuned mass vibration reduction function. The tuned mass vibration damper comprises an observation cylinder and a top cover plate, the tuned mass vibration damper is arranged in the observation cylinder and comprises a support, a damping element, an elastic element and a mass block, the support is fixedly arranged on the observation cylinder, the elastic element is composed of at least one elastic rod, the two ends of the elastic rod are supported on the support respectively, and the mass block is arranged on the damping element. The mass block is fixedly arranged on the elastic rod, and the damping element is arranged on the elastic rod or connected with the mass block. The space utilization efficiency is high, the vibration isolation effect of the steel spring floating slab ballast bed system can be effectively improved, meanwhile, the in-vehicle noise generated when an operating vehicle passes through is remarkably reduced, and the steel spring floating slab ballast bed system can be applied to new line construction and old line transformation and has a wide application prospect. The steel spring floating slab track bed can be widely applied to steel spring floating slab track bed projects of rail transit lines such as subways and elevated light rails.

Description

Technical Field

[0001] The utility model relates to the technical field of floating plate roadbeds for rail transportation, in particular to an observation tube with a tuning mass vibration reduction function. Background Art

[0002] Among the existing vibration and noise reduction technologies for rail transit, the most successful practical application is the floating plate track bed technology, which has high vibration isolation efficiency and stable working performance, and has become a consensus in the industry. In particular, the steel spring floating plate track bed system has a low natural frequency, usually 6-12Hz, and the vibration reduction effect can reach 20dB or even higher. It is the only special grade vibration reduction measure in the subway industry. In order to solve the above problems, Chinese patent CN206015936U discloses a non-deflection rod high-frequency tuned mass shock absorber, including a mass block, an elastic element and a damping element, which can be widely used in high-frequency vibration control of structures such as subway track beds. However, it was found in practice that during the operation of the train, when passing through the steel spring floating plate section, low-frequency noise problems occurred on some lines, affecting the comfort experience of passengers in the car.

[0003] In summary, the market urgently needs a technical means to effectively control the low-frequency noise of steel spring floating plates. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned drawbacks and provide an observation tube with a tuned mass vibration reduction function.

[0005] The present invention provides an observation tube with a tuned mass vibration reduction function, which includes an observation tube body and a top cover plate. A tuned mass vibration reduction device is provided inside the observation tube body. The tuned mass vibration reduction device includes a bracket, a damping element, an elastic element, and a mass block. The bracket is fixedly provided on the observation tube body. The elastic element is composed of at least one elastic rod, the two ends of the elastic rod are respectively supported on the bracket. The mass block is fixedly provided on the elastic rod. The damping element is provided on the elastic rod or the damping element is connected to the mass block.

[0006] Preferably, two elastic rods are provided, and the two elastic rods are symmetrically arranged relative to the mass block.

[0007] In order to effectively improve the vibration reduction performance of the observation tube with tuned mass vibration reduction function of the present invention, the tuned mass vibration reduction device also includes a frequency modulation device. The specific structural form of the frequency modulation device can be varied. For example, the frequency modulation device is an auxiliary support block, which is fixed on the bracket and supports the elastic rod together with the bracket; or, the frequency modulation device is a frequency modulation sleeve, which is sleeved and fixed on the elastic rod. The specific structural form of the damping element can be varied. For example, the damping element is a damping sleeve, which is sleeved on the elastic rod; or, the damping element is a damper, one end of the damper is connected to the mass block, and the other end is connected to the observation tube body, bracket or foundation.

[0008] In addition, in order to facilitate the adjustment of the total mass of the parametric vibration, the mass block is composed of multiple sub-mass blocks, and the multiple sub-mass blocks are connected into one by fasteners.

[0009] When in use, similar to traditional observation tubes, the observation tube with tuned mass vibration reduction function of the present invention can be cast into one piece with the floating plate according to the designed quantity and position; alternatively, the observation tube body of the present invention and the floating plate can be cast into one piece first, and after the floating plate is lifted and leveled, the tuned mass vibration reduction device can be installed into the observation tube body to complete the assembly of the observation tube with tuned mass vibration reduction function of the present invention.

[0010] The present invention provides an observation tube with a tuned mass vibration reduction function. By adding a tuned mass vibration reduction device within the observation tube, the tuned mass vibration reduction device can be used to control specific frequency vibrations that contribute significantly to low-frequency noise energy, thereby effectively reducing the low-frequency noise radiation of the steel spring floating plate track bed, reducing in-vehicle noise, and improving passenger comfort within the vehicle. Compared to conventional technologies, the tuned mass vibration reduction device in the present invention utilizes an elastic rod as an elastic element, resulting in a more compact structure. Compared to conventional technologies that utilize steel springs as elastic elements, the tuned mass vibration reduction device occupies less space and has higher space utilization efficiency, facilitating full utilization of the limited space within the observation tube to achieve a better vibration reduction effect. Furthermore, the elastic rod is less expensive, has more stable performance, and has a longer service life than conventional steel springs, requiring little maintenance, and is therefore more economical, applicable, and practical.

[0011] To sum up, the observation tube with tuned mass vibration reduction function of the utility model has high space utilization efficiency, can effectively improve the vibration isolation effect of the steel spring floating plate roadbed system, and significantly reduce the noise inside the vehicle when the operating vehicles pass by. It can be used for both new line construction and old line reconstruction, and can be widely used in steel spring floating plate roadbed projects of rail transit lines such as subways and elevated light rails. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1This is one of the structural schematic diagrams of the observation tube with tuned mass vibration reduction function of the utility model.

[0013] Figure 2 for Figure 1 AA cross-sectional view.

[0014] Figure 3 for Figure 2 BB cross-sectional view.

[0015] Figure 4 This is the second structural diagram of the observation tube with tuned mass vibration reduction function of the present invention.

[0016] Figure 5 This is the third structural diagram of the observation tube with tuned mass vibration reduction function of the present invention.

[0017] Figure 6 for Figure 5 CC cross-sectional view.

[0018] Figure 7 This is the fourth structural diagram of the observation tube with tuned mass vibration reduction function of the present invention.

[0019] Figure 8 This is the fifth structural diagram of the observation tube with tuned mass vibration reduction function of the present invention.

[0020] Figure 9 for Figure 8 DD cross-sectional view.

[0021] Figure 10 This is the sixth structural diagram of the observation tube with tuned mass vibration reduction function of the present invention.

[0022] Figure 11 for Figure 10 EE cross-sectional view. DETAILED DESCRIPTION

[0023] Example 1

[0024] like Figure 1 、 Figure 2 and Figure 3The utility model of the present invention has a tuning mass vibration reduction function, including an observation tube body 1 and a top cover plate 2. The four corners of the top of the observation tube body 1 are respectively fixed with limit blocks 3, and the top cover plate 2 is placed on the limit blocks 3 and fixed together by screws 4; In addition, a tuning mass vibration reduction device is also provided inside the observation tube body 1, and the tuning mass vibration reduction device includes a bracket, a damping element, an elastic element and a mass block, wherein the bracket is specifically a connecting seat composed of a support block 6 and a pressing plate 7, and the support block 6 and the pressing plate 7 are fixed by screws The bolts 8 are connected together, the supporting block 6 is welded and fixed to the observation cylinder 1, and the elastic element is composed of a steel elastic rod 9. The two ends of the elastic rod 9 are respectively supported on the supporting block 6 and then locked and fixed with the pressing plate 7 and the bolt 8. A connecting ear plate 12 is fixed on the mass block 11. The connecting ear plate 12 and the elastic rod 9 are interference fit to fix the mass block 11 on the elastic rod 9. The damping element is a damping sleeve 10 made of elastic high-damping rubber, and the damping sleeve 10 is sleeved on the surface of the elastic rod 9.

[0025] During application, similar to a traditional observation tube, the observation tube with a tuned mass vibration reduction function of the present invention can be cast into one piece with the floating plate according to the designed quantity and position; alternatively, the observation tube body of the present invention can be cast into one piece with the floating plate first, and after the lifting and leveling of the floating plate is completed, the tuned mass vibration reduction device can be installed into the observation tube body to complete the assembly of the observation tube with a tuned mass vibration reduction function of the present invention. Since the application of the observation tube body during the application of the present invention is basically the same as that of the traditional observation tube, no additional drawings are provided here to illustrate it, and only text is provided for description. The tuned mass vibration reduction device in the present invention uses an elastic rod as an elastic element and a damping sleeve as a damping element. When the floating plate vibrates due to the operation of the vehicle, the tuned mass vibration reduction device works, and during the deformation process, the elastic rod squeezes and shears the damping sleeve to dissipate energy, thereby achieving the technical effect of attenuating vibration energy.

[0026] When the natural frequency of the tuned mass vibration damping device described in this example needs to be adjusted, the adjustment method is relatively flexible. For example, it can be achieved by adjusting the total weight of the mass block; or it can be achieved by replacing elastic rods with different elasticities; it can even be achieved by adjusting the total weight of the mass block and the elasticity of the elastic rods at the same time. In practice, the choice can be made according to the actual engineering situation.

[0027] The present invention provides an observation tube with a tuned mass vibration damping function. By adding a tuned mass vibration damping device within the observation tube, the tuned mass vibration damping device can be used to control specific frequency vibrations that contribute significantly to low-frequency noise energy, thereby effectively reducing the low-frequency noise radiation of the steel spring floating plate trackbed, reducing in-car noise, and improving passenger comfort within the vehicle. Furthermore, the tuned mass vibration damping device is disposed within the observation tube, without occupying space outside the floating plate and without affecting the layout of other components. Compared to conventional technologies, the tuned mass vibration damping device of the present invention utilizes an elastic rod as an elastic element, resulting in a more compact structure. Compared to conventional technologies that utilize steel springs as elastic elements, the tuned mass vibration damping device occupies less space and has higher space utilization efficiency, facilitating full utilization of the limited space within the observation tube to achieve better vibration damping effects. Furthermore, the elastic rod is less expensive, has more stable performance, and has a longer service life than conventional steel springs, requiring little maintenance, resulting in superior economical, applicable, and practical advantages.

[0028] To sum up, the observation tube with tuned mass vibration reduction function of the utility model has high space utilization efficiency, can effectively improve the vibration isolation effect of the steel spring floating plate roadbed system, and significantly reduce the noise inside the vehicle when the operating vehicles pass by. It can be used for both new line construction and old line reconstruction, and can be widely used in steel spring floating plate roadbed projects of rail transit lines such as subways and elevated light rails.

[0029] It should be pointed out that, in this example, a damping sleeve made of elastic high-damping rubber is used as an example for illustration, but in actual applications, the damping sleeve can also be made of other materials such as elastic high-damping polyurethane; in addition, in this example, a steel elastic rod is used as an example for illustration, but in practice, the elastic rod can also be made of carbon fiber, aluminum alloy or other materials, and suitable materials can be selected according to engineering needs; in addition, in this example, only one elastic rod is provided, but in actual applications, two, three or even more can be provided to achieve similar technical effects. These are simple changes based on the technical principles of the utility model and are all within the scope of protection required by the utility model.

[0030] Example 2

[0031] like Figure 4 The observation tube with tuned mass vibration reduction function of the utility model shown in the figure differs from the first embodiment in that it also includes a frequency modulation device, which is an auxiliary support block 13. The auxiliary support block 13 is fixed to the bracket. Specifically, the auxiliary support block 13 is fixed to the support block 6 through a positioning pin 14. The support block 6 and the auxiliary support block 13 jointly support the elastic rod 9.

[0032] The application method of the observation tube with tuned mass vibration reduction function of the present invention described in this example is basically the same as that described in Example 1, and will not be repeated here.

[0033] Compared with Example 1, in the technical solution described in this example, since a frequency modulation device is added, the effective working length of the elastic rod can be adjusted using the auxiliary support block, thereby achieving the effect of adjusting the natural frequency of the system. Compared with replacing the elastic rod or adjusting the total weight of the mass block, the use of the frequency modulation device is more convenient and quick, and more economical. It has a higher cost-effectiveness, which is conducive to optimizing the natural frequency of the tuned mass vibration damping device and improving the vibration reduction effect of the system.

[0034] Example 3

[0035] like Figure 5 and Figure 6 The observation tube with a tuned mass vibration reduction function of the utility model shown here differs from the second embodiment in that the elastic rod 9 adopts a steel screw, two elastic rods 9 are provided, and the two elastic rods 9 are symmetrically arranged relative to the mass block 11; the bracket adopts a support block 6 with an L-shaped cross-section, the support block is provided with a groove, the elastic rod 9 is embedded in the groove, and then locked and fixed by a locking nut 16. In addition, the elastic rod 9 is also locked and fixed by a locking nut 16 after being matched with the connecting ear plate 12; in addition, the damping element is a damper 15, one end of the damper 15 is connected to the mass block 11, and the other end is connected to the observation tube body 1.

[0036] Compared with Example 2, the technical solution described in this example is easier to disassemble and assemble, has better stability, and is more convenient for subsequent maintenance because it uses two elastic rods and locking nuts to fix them. In addition, since a damper is provided as a damping element, the damping performance of the system is better, which is conducive to further improving the vibration reduction performance of the system.

[0037] It should be pointed out that based on the technical principle of this example, the technical solution described in this example can also be equipped with a frequency modulation device. Figure 7 As shown, the frequency modulation device is a frequency modulation sleeve 17, which is sleeved on the elastic rod 9 and abutted against the support block 6 by means of a locking nut 16. The frequency modulation sleeve can be used to adjust the effective working length of the elastic rod, thereby achieving the effect of adjusting the natural frequency of the system.

[0038] Example 4

[0039] like Figure 8 and Figure 9The observation tube with tuned mass vibration reduction function of the utility model shown here differs from the third embodiment in that the bracket specifically includes a support block 6 and a connecting frame 20, and the support block 6 and the connecting frame 20 are fixedly connected by fasteners 19; an elastic rod 9 is provided on the connecting frame 20, and the elastic rod 9 passes through the middle of the mass block 11. Frequency-modulating sleeves 17 are respectively provided on both sides of the mass block 11, and the frequency-modulating sleeves 17 are fixed to the elastic rod 9 by locking screws 18, while realizing the connection limit between the mass block 11 and the elastic rod 9; the damping element is a damper 15, and the damper 15 is specifically a viscous damper. The damper 15 is arranged between the mass block 11 and the connecting frame 20.

[0040] Compared with the third embodiment, the technical solution described in this embodiment has better integrity. The mass block, the damping element and the elastic rod can be assembled together in advance and then placed in the observation cylinder as a whole for installation and fixation, which is faster and more convenient.

[0041] Example 5

[0042] like Figure 10 and Figure 11 The observation tube with tuned mass vibration reduction function of the present invention shown here differs from the fourth embodiment in that two elastic rods 9 are provided, which are fixed to the connecting frame 20 by means of locking nuts 16; the mass block 11 is composed of multiple sub-masses, which are connected together by fastening connectors 21, and the elastic rod 9 passes through the lowest sub-mass block, thereby supporting all the sub-masses.

[0043] Compared with the fourth embodiment, in the technical solution described in this embodiment, since the mass block is composed of multiple sub-mass blocks, the natural frequency of the tuned mass vibration damping device can be adjusted by adding or reducing the sub-mass blocks. Moreover, when adjusting, the top cover plate 2 can be directly opened and the sub-mass blocks can be installed and removed from the top of the observation cylinder 1. There is no need to remove the tuned mass vibration damping device as a whole, which is very convenient.

[0044] The embodiments in the present invention are only for better illustrating the technical solutions of the present invention and should not be regarded as limiting the present invention. The technical features in many embodiments can also be used interchangeably. Based on the technical principles of the present invention, those skilled in the art can recombine the technical solutions described in the above embodiments or simply replace some of the components therein with similar technologies. As long as they are based on the technical principles of the present invention, they are within the scope of protection required by the present invention.

Claims

1. An observation tube with tuned mass vibration reduction function, comprising an observation tube body and a top cover plate, characterized in that: A tuned mass vibration damping device is arranged inside the observation cylinder, and the tuned mass vibration damping device includes a bracket, a damping element, an elastic element and a mass block. The bracket is fixedly arranged on the observation cylinder, the elastic element is composed of at least one elastic rod, and the two ends of the elastic rod are respectively supported on the bracket. The mass block is fixed on the elastic rod, and the damping element is arranged on the elastic rod or the damping element is connected to the mass block.

2. The observation tube with tuned mass vibration reduction function according to claim 1, characterized in that: Two elastic rods are provided, and the two elastic rods are symmetrically arranged relative to the mass block.

3. The observation tube with tuned mass vibration reduction function according to claim 1, characterized in that: The tuned mass vibration damping device also includes a frequency modulation device.

4. The observation tube with tuned mass vibration reduction function according to claim 3, characterized in that: The frequency modulation device is an auxiliary supporting block, which is fixed on the bracket and supports the elastic rod together with the bracket.

5. The observation tube with tuned mass vibration reduction function according to claim 3, characterized in that: The frequency modulation device is a frequency modulation shaft sleeve, which is sleeved and fixed on the elastic rod.

6. The observation tube with tuned mass vibration reduction function according to claim 1, characterized in that: The damping element is a damping sleeve, which is sleeved on the elastic rod.

7. The observation tube with tuned mass vibration reduction function according to claim 1, characterized in that: The damping element is a damper, one end of which is connected to the mass block, and the other end of which is connected to the observation cylinder, the bracket or the foundation.

8. The observation tube with tuned mass vibration reduction function according to claim 1, characterized in that: The mass block is composed of a plurality of sub-mass blocks, and the plurality of sub-mass blocks are connected into one body by fasteners.

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