Rigidity testing device for floating slab type track vibration isolator

Abstract

The utility model discloses a rigidity testing device for a floating slab type track vibration isolator, and relates to the field of urban rail transit. Comprising a bearing part placed on the top of a tested vibration isolator, a loading assembly located above the bearing part, a pressure sensor used for monitoring the loading force borne by the bearing part, a displacement sensor used for monitoring the longitudinal displacement of the bearing part, and an acceleration sensor used for monitoring the acceleration of the bearing part. The bearing piece comprises a bearing part and a force transmission part which are distributed up and down, the bearing part is in a plate shape, and the force transmission part is a plurality of protrusions fixed to the bottom face of the bearing part. The utility model provides a rigidity testing device for a floating slab type track vibration isolator, so as to solve the problem that in the prior art, an on-site vibration isolator needs to be detected through an indoor test, and achieve the purposes of improving the detection efficiency of the on-site vibration isolator and reducing the detection cost.

Description

Technical Field

[0001] The utility model relates to the field of urban rail transit, in particular to a floating plate type track vibration isolator stiffness testing device. Background Art

[0002] With the continuous acceleration of urbanization, urban rail transit, as a safe, convenient, efficient, green and economical mode of transportation, plays an important role in meeting the people's transportation needs, relieving urban traffic pressure, and promoting social and economic progress. However, with the continuous development of urban rail transit, the environmental vibration and noise problems it brings are becoming increasingly prominent.

[0003] In order to achieve the purpose of vibration reduction and noise reduction, floating plate vibration reduction track has been widely used as a special track type, and its longest service time has exceeded 20 years. The floating plate track is a special track structure that sets a vibration isolator with a specific stiffness between the integral roadbed and the lower foundation of the roadbed, so that the roadbed is separated from the foundation structure, forming a "mass-spring" vibration isolation system to isolate or reduce the vibration transmitted from the track to the surrounding. The application practice of existing operating lines shows that under the influence of factors such as train dynamic load, external environment and irregular initial construction, spring vibration isolators may have problems such as broken springs, rust, water immersion or gravel foreign objects invading the internal springs, causing the stiffness of the vibration isolator to deviate from the design value, resulting in uneven support state and unbalanced force of the floating plate track, which seriously weakens the track vibration reduction effect, affects driving safety and stability, and reduces the long-term service performance of the track system.

[0004] At present, in the maintenance of existing operating lines, the vibration reduction effect of vibration isolators is mainly evaluated by sampling vibration isolators from the site for indoor testing. The indoor test refers to the technical standards such as "Technical Conditions for Ballastless Track of Urban Rail Transit" (GB / T 38695-2020), "Test Methods for Static and Dynamic Performance of Vibration and Shock Isolators" (GB / T 15168-2013) and "Rubber Spring Vibration Isolators for Floating Plates of Urban Rail Transit" (GB / T 41492-2022), and focuses on key parameters such as stiffness.

[0005] However, this method of sampling vibration isolators from the field for indoor testing has the disadvantages of high cost, limited number of vibration isolators extracted from a single skylight point, and low detection efficiency. For example, in order not to change the supporting state of the floating plate, the number of vibration isolators sampled is relatively small, so it is difficult to use a small sampling sample of vibration isolators to evaluate the vibration reduction effect of the entire vibration reduction section; on the other hand, in the subsequent maintenance and replacement of vibration isolators, due to the limited number of indoor test samplings, it is impossible to accurately evaluate the vibration reduction effect of the in-service vibration isolators by manual appearance inspection, so the existing detection methods are difficult to accurately distinguish the scope of vibration isolators that need to be repaired or replaced. Utility Model Content

[0006] The utility model provides a floating plate track vibration isolator stiffness testing device to solve the problem in the prior art that on-site vibration isolators need to be tested through indoor tests, thereby achieving the purpose of improving the testing efficiency of on-site vibration isolators and reducing the testing cost.

[0007] The utility model is realized by the following technical solutions:

[0008] A floating plate track isolator stiffness test device comprises a bearing member placed on the top of the isolator to be tested, a loading assembly located above the bearing member, a pressure sensor for monitoring the loading force applied to the bearing member, a displacement sensor for monitoring the longitudinal displacement of the bearing member, and an acceleration sensor for monitoring the acceleration of the bearing member; the bearing member comprises a bearing portion and a force transmission portion distributed in an upper and lower manner, the bearing portion is in a plate shape, and the force transmission portion is a plurality of protrusions fixed on the bottom surface of the bearing portion.

[0009] In view of the high cost, low efficiency, and limited number of tests caused by the need to test the on-site vibration isolators through indoor tests in the prior art, the utility model proposes a floating plate track vibration isolator stiffness test device. When the device is in use, the bearing member is directly placed on the top of the vibration isolator to be tested, and the bearing member is loaded through the loading assembly. The loading force is transmitted to the vibration isolator below through the bearing member. The pressure sensor monitors the pressure on the bearing member in real time during the loading process, the displacement sensor monitors the longitudinal displacement of the bearing member in real time during the loading process, and the acceleration sensor monitors the acceleration of the bearing member in real time during the loading process. The force-displacement curve and the acceleration change curve during the loading process can be obtained, and the stiffness of the vibration isolator to be tested can be calculated based on this, and then the vibration reduction effect of the in-service vibration isolator can be evaluated, and it can be judged whether the current vibration isolator needs to be repaired or replaced. In the device, the structure of the bearing member includes a bearing part and a force transmission part, wherein the bearing part is located above the force transmission part, and the load applied by the upper loading assembly is received through the plate-shaped bearing part, and the load is transmitted downward to the vibration isolator to be tested through the force transmission part.

[0010] The device solves the cumbersome process in the prior art that, when evaluating the vibration reduction effect of the vibration isolator, the vibration isolator needs to be removed and transported to a laboratory for indoor testing. The device can be used to perform online detection of the stiffness of the vibration isolator and then to perform online evaluation of the vibration reduction effect of the vibration isolator, which significantly reduces the detection cost of the vibration isolator and improves the detection efficiency. In addition, the device can quickly perform a large number of detections on the vibration isolator on site, so compared with the sampling method in the prior art, the number of detections can be significantly increased, which is more suitable for evaluating the vibration reduction effect of the entire vibration reduction section.

[0011] In summary, this application achieves accurate and rapid detection of the stiffness of existing vibration isolators on site in urban rail transit within the skylight point, solving the problems of inaccurate on-site appearance inspection, high cost of laboratory stiffness testing, and difficulty in large-scale detection in traditional methods. This application can meet the detection needs of floating plate vibration reduction tracks on existing operating lines, and is applicable to existing rubber vibration isolators, steel spring vibration isolators, and other new vibration isolators with elastic elements as the core.

[0012] Furthermore, the force transmission part includes a plurality of coaxial arc-shaped protrusions, and there is a gap between two adjacent arc-shaped protrusions along the circumferential direction. This solution transmits the load to the vibration isolator through a plurality of arc-shaped protrusions, and all the arc-shaped protrusions together form a nearly annular structure. The interior of each arc-shaped protrusion and between adjacent arc-shaped protrusions are unfilled hollow structures, which can make the load transmitted downward to the vibration isolator more concentrated, and thus more conducive to detecting the vibration reduction effect of the vibration isolator.

[0013] Furthermore, the bearing portion is a circular plate, and the bearing portion is coaxial with each arc-shaped protrusion; that is, the axis of any arc-shaped protrusion is colinear with the axis of the bearing plate.

[0014] Furthermore, the pressure sensor, displacement sensor and acceleration sensor are all installed on the bearing member. The installation method of the pressure sensor, displacement sensor and acceleration sensor on the bearing member is not limited here, as long as it can monitor the required data, and those skilled in the art can perform adaptive installation and arrangement according to the existing technology.

[0015] Furthermore, it also includes a buffer member located on the bearing member, which is used to provide buffering protection for the bearing member.

[0016] Furthermore, the buffer and the carrier are connected via a connecting member, and the connecting member can adopt any existing connection method to achieve a fixed connection between the buffer and the carrier, and can also facilitate the disassembly or replacement of the buffer and / or the carrier.

[0017] Furthermore, the loading assembly includes a guide rod located on the buffer member and an excitation hammer slidably connected to the guide rod.

[0018] When using this device, the excitation hammer is made to slide down along the guide rod at a specified height to perform the loading function. The excitation hammer is guided by the guide rod to prevent the excitation hammer from tilting during the falling process, ensuring that the loading is downward in the vertical direction. The specific installation and positioning method of the guide rod is not limited here, and it only needs to meet its own axial verticality.

[0019] Furthermore, a control member for controlling the release of the excitation hammer is fixedly connected to the guide rod, and a release mechanism for temporarily connecting the excitation hammer is provided on the control member.

[0020] Before the test begins, the excitation hammer is connected to the control component through a release mechanism, and when the test begins, the excitation hammer is released through the release mechanism. This solution can ensure that the initial height of the excitation hammer is the same during each test, thereby ensuring the consistency of the experimental conditions.

[0021] Furthermore, the release mechanism includes a hook rotatably connected to the control member, a lever connected to the hook, and an elastic member is connected between the hook and the control member; the hook is used to hook the excitation hammer.

[0022] Before the test starts, the scheme hooks the excitation hammer to prevent it from moving downward; when the test needs to start, the lever is operated to rotate the lever and the hook until the hook releases the restriction on the excitation hammer and the excitation hammer slides downward freely, and the lever is reset under the action of the elastic member.

[0023] Furthermore, it also includes a data acquisition device that is signal-connected to the pressure sensor, displacement sensor, and acceleration sensor. This solution receives monitoring signals from each sensor through the data acquisition device. The signal connection method can be wireless, wired, or other methods, which are not specifically limited here.

[0024] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0025] 1. The utility model solves the cumbersome process in the prior art that when evaluating the vibration reduction effect of the vibration isolator, the vibration isolator needs to be removed and transported to the laboratory for indoor testing. The device can be used to perform online detection of the stiffness of the vibration isolator and then perform online evaluation of the vibration reduction effect of the vibration isolator, which significantly reduces the detection cost of the vibration isolator and improves the detection efficiency.

[0026] 2. The utility model can quickly perform a large number of tests on vibration isolators on site, so compared with the existing sampling method, the number of tests can be significantly increased, which is more suitable for evaluating the vibration reduction effect of the entire vibration reduction section.

[0027] 3. The utility model provides a floating plate track isolator stiffness testing device, which realizes the accurate and rapid detection of the stiffness of existing isolators at the urban rail transit site within the skylight point, and solves the problems of inaccurate on-site appearance inspection, high cost of laboratory stiffness testing, and difficulty in large-area detection in traditional methods.

[0028] 4. The utility model can meet the requirements for floating plate vibration reduction track detection of existing operating lines, and is applicable to existing rubber isolators, steel spring isolators and other new isolators with elastic elements as the core. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model. In the drawings:

[0030] Figure 1 It is a front view of a specific embodiment of the utility model;

[0031] Figure 2 It is a structural schematic diagram of a specific embodiment of the utility model;

[0032] Figure 3 It is a structural schematic diagram of a bearing member in a specific embodiment of the utility model;

[0033] Figure 4 It is a schematic structural diagram of a specific embodiment of the present invention in which the bearing member is in an inverted state.

[0034] Marks and corresponding parts names in the attached drawings:

[0035] 1-data acquisition equipment, 2-control part, 3-excitation hammer, 4-guide rod, 5-buffer part, 6-connecting part, 7-bearing part, 701-bearing part, 702-force transmission part, 8-vibration isolator, 9-hook, 10-shift rod, 11-elastic part. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the utility model clearer, the utility model is further described in detail in combination with the embodiments and the accompanying drawings. The schematic implementation mode of the utility model and its description are only used to explain the utility model and are not used as a limitation of the utility model. In the description of the present application, it should be understood that the orientation or position relationship indicated by terms such as "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application.

[0037] Example 1

[0038] like Figure 1 and Figure 2 The floating plate track isolator stiffness test device shown in the figure includes a bearing member 7 placed on the top of the isolator 8 to be tested, a loading assembly located above the bearing member 7, a pressure sensor for monitoring the loading force on the bearing member 7, a displacement sensor for monitoring the longitudinal displacement of the bearing member 7, and an acceleration sensor for monitoring the acceleration of the bearing member 7; and also includes a data acquisition device 1 that is signal-connected to the pressure sensor, the displacement sensor, and the acceleration sensor.

[0039] Among them, the pressure sensor, displacement sensor and acceleration sensor are all installed on the carrier 7; for example, the pressure sensor is installed on the top surface of the carrier 7, the displacement sensor is installed on the side or bottom of the carrier 7, and the acceleration sensor is installed inside the carrier 7. The data acquisition device 1 can be implemented by a computer, a portable processor, a tablet computer or a dedicated mobile terminal.

[0040] In this embodiment, the structure of the bearing member 7 is as follows Figure 3 and Figure 4 As shown, it includes a bearing portion 701 and a force transmission portion 702 which are distributed in the upper and lower parts. The bearing portion 701 is in a plate shape, and the force transmission portion 702 is a plurality of protrusions fixed on the bottom surface of the bearing portion 701.

[0041] Preferably, the force transmission part 702 is a plurality of coaxial arc-shaped protrusions, and there is a gap between two adjacent arc-shaped protrusions along the circumferential direction. In this embodiment, there are two arc-shaped protrusions, and the central angle corresponding to a single arc-shaped protrusion is 130°-150°.

[0042] Preferably, the bearing portion 701 is a circular plate, and the bearing portion 701 is coaxial with each arc-shaped protrusion. More preferably, the outer diameter of each arc-shaped protrusion is equal to the outer diameter of the bearing portion 701.

[0043] Example 2

[0044] A floating plate track isolator stiffness testing device, based on Example 1, as Figure 1 and Figure 2 As shown, the structure also includes a buffer member 5 located on the bearing member 7, and the buffer member 5 can be realized by using an existing spring damping device. The buffer member 5 is connected to the bearing member 7 through a connecting member 6.

[0045] The loading assembly in this embodiment includes a guide rod 4 located on a buffer member 5, an excitation hammer 3 slidably connected to the guide rod 4, a control member 2 for controlling the release of the excitation hammer 3 is fixedly connected to the guide rod 4, and a release mechanism for temporarily connecting the excitation hammer 3 is provided on the control member 2.

[0046] In this embodiment, the release mechanism includes a hook 9 rotatably connected to the control member 2 , a lever 10 connected to the hook 9 , and an elastic member 11 is connected between the hook 9 and the control member 2 ; the hook 9 is used to hook the excitation hammer 3 .

[0047] The elastic member 11 in this embodiment is a tension spring, which always provides the hook 9 with a force in the direction of hooking the excitation hammer 3, so that when the excitation hammer 3 is not released, the connection between the excitation hammer 3 and the control member 2 can be stably achieved.

[0048] In a more preferred embodiment, a level gauge, such as a bubble level gauge, may be provided on the control member 2 to assist in determining whether the guide rod 4 is vertical.

[0049] In a more preferred embodiment, a ring handle is fixedly connected to the outside of the excitation hammer 3 to facilitate the staff to hold and lift the excitation hammer 3.

[0050] In a more preferred embodiment, a plurality of through holes for exhausting air may be provided on the surface of the bearing portion 701 to prevent the excitation hammer 3 from falling too fast to cause air excitation and thus generate additional load on the bearing portion 701 .

[0051] The floating plate track isolator stiffness test device of this embodiment is tested by the following method:

[0052] Place the bearing member on the top of the vibration isolator, lift the excitation hammer 3 to the bottom of the control member 2, and hook the excitation hammer 3 with the hook 9;

[0053] Rotate the lever 10 to make the exciting hammer 3 fall;

[0054] The data acquisition device 1 records the pressure, displacement and acceleration data during the impact process;

[0055] The stiffness of the vibration isolator is calculated by inversion. The specific calculation principle is: filter the collected sensor signals, obtain the displacement of the vibration isolator under different impact forces, and perform regression analysis on the dynamic displacement corresponding to different impact forces to obtain the stiffness of the vibration isolator.

[0056] When the obtained stiffness exceeds the allowable range of the design stiffness of the vibration isolator, it is determined that the vibration isolator is damaged.

[0057] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

[0058] It should be noted that, in this article, terms such as "include", "comprise" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In addition, the term "connected" used in this article can be directly connected or indirectly connected via other components without special explanation.

Claims

1. A floating plate track isolator stiffness test device, characterized in that: It comprises a bearing member (7) for being placed on the top of the vibration isolator to be tested, a loading assembly located above the bearing member (7), a pressure sensor for monitoring the loading force applied to the bearing member (7), a displacement sensor for monitoring the longitudinal displacement of the bearing member (7), and an acceleration sensor for monitoring the acceleration of the bearing member (7); The bearing member (7) comprises a bearing portion (701) and a force transmission portion (702) which are distributed upward and downward, the bearing portion (701) being in the shape of a plate, and the force transmission portion (702) being a plurality of protrusions fixed on the bottom surface of the bearing portion (701).

2. A floating plate track isolator stiffness testing device according to claim 1, characterized in that: The force transmission portion (702) comprises a plurality of coaxial arc-shaped protrusions, and a gap is provided between two adjacent arc-shaped protrusions along the circumferential direction.

3. A floating plate track isolator stiffness testing device according to claim 2, characterized in that: The bearing portion (701) is a circular plate, and the bearing portion (701) is coaxial with each arc-shaped protrusion.

4. A floating plate track isolator stiffness testing device according to claim 1, characterized in that: The pressure sensor, displacement sensor and acceleration sensor are all mounted on the bearing member (7).

5. The floating plate track isolator stiffness testing device according to claim 1, characterized in that: It also includes a buffer component (5) located on the bearing component (7).

6. A floating plate track isolator stiffness testing device according to claim 5, characterized in that: The buffer component (5) and the bearing component (7) are connected via a connecting component (6).

7. A floating plate track isolator stiffness testing device according to claim 5, characterized in that: The loading assembly comprises a guide rod (4) located on the buffer member (5) and an excitation hammer (3) slidably connected to the guide rod (4).

8. A floating plate track isolator stiffness testing device according to claim 7, characterized in that: A control member (2) for controlling the release of the excitation hammer (3) is fixedly connected to the guide rod (4), and a release mechanism for temporarily connecting the excitation hammer (3) is provided on the control member (2).

9. A floating plate track isolator stiffness testing device according to claim 8, characterized in that: The release mechanism comprises a hook (9) rotatably connected to the control member (2), a lever (10) connected to the hook (9), and an elastic member (11) connected between the hook (9) and the control member (2); the hook (9) is used to hook the excitation hammer (3).

10. The floating plate track isolator stiffness testing device according to claim 1, characterized in that: It also includes a data acquisition device (1) which is signal-connected to the pressure sensor, the displacement sensor, and the acceleration sensor.

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