Steel spring vibration isolator damping ratio detection device based on natural vibration attenuation method

Abstract

The utility model discloses a steel spring vibration isolator damping ratio detection device based on a natural vibration attenuation method. The detection device comprises a drop hammer, a balancing weight, a vibration pickup and a data acquisition instrument, a supporting device is arranged below the balancing weight, and the supporting device comprises a balancing weight supporting frame capable of being separated from the balancing weight, a four-column jack supporting the balancing weight supporting frame and a concrete foundation; the sample feeding device can slide and partially enter the supporting device; the sample conveying device comprises at least one sample conveying flat car and a sample conveying car supporting frame matched with the sample conveying flat car. Compared with a traditional vibration isolator damping ratio detection device, the steel spring vibration isolator damping ratio detection device based on the natural vibration attenuation method has the advantages of being easy to operate, reliable in control, accurate in position and the like, and the detection accuracy and efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to a vibration damping device, and more specifically, to a damping ratio detection device for a steel spring vibration isolator based on the self-oscillation decay method. Background Art

[0002] At present, as the main vibration isolation element of the steel spring floating slab, the performance parameters of the steel spring vibration isolator are directly related to the smoothness of train operation, vibration isolation and noise reduction effects. The test of the damping ratio often requires placing concrete blocks on the vibration isolator, and then evenly distributing four vibration pickups on the upper surface of the concrete blocks around the center position, and using an external force to strike the center position of the concrete blocks. At this time, the data acquisition instrument will transmit the velocity data of the vibration pickups to the computer, and the damping ratio is calculated through the free decay theory.

[0003] The existing damping ratio test method based on the foregoing steel spring vibration isolator has the following defects:

[0004] First, a forklift or a crane is usually used to lift the concrete block and place it on the vibration isolator. It is difficult to ensure that the center of the concrete block is exactly placed directly above the vibration isolator, which greatly reduces the experimental accuracy and efficiency.

[0005] Second, by using the method of manually hammering the center position of the concrete block, the force and the landing point of the hammering cannot be guaranteed.

[0006] Third, by using four vibration pickups evenly distributed on the concrete surface for data acquisition, the vertical displacement of the center position cannot be accurately obtained completely. Summary of the Utility Model

[0007] In order to overcome the problems of poor accuracy, low efficiency, low accuracy, etc., the utility model provides a damping ratio detection device for a steel spring vibration isolator based on the self-oscillation decay method. The damping ratio detection device for a steel spring vibration isolator based on the self-oscillation decay method can accurately control the force and the landing point of the external force, thereby improving the experimental accuracy.

[0008] In order to achieve the above object, the utility model adopts the following technical solutions:

[0009] A damping ratio detection device for a steel spring vibration isolator based on the self-oscillation decay method, including a drop hammer, a counterweight, a vibration pickup and a data acquisition instrument, and further including the following structures:

[0010] A support device is arranged below the counterweight, including a counterweight support frame separable from the counterweight, a four-column jack supporting the counterweight support frame, and a concrete foundation;

[0011] A sample feeding device slidable and partially entering the support device; the sample feeding device includes at least one sample feeding flatbed truck and a sample feeding vehicle support frame matched with the vehicle.

[0012] The aforesaid "matching" means that the size and shape of the sample delivery vehicle support frame can support the sample delivery flatbed vehicle without affecting its horizontal movement state.

[0013] Further, a circular hole capable of clamping the steel spring vibration isolator sample is provided at the center of the sample delivery flatbed vehicle.

[0014] Further, pulleys are installed on both sides of the lower part of the sample delivery flatbed vehicle, and slide rails are installed on both sides of the upper part of the sample delivery vehicle support frame.

[0015] Further, the counterweight support frame is equipped with slide rails.

[0016] During use, the sample delivery flatbed vehicle can slide back and forth between the counterweight support frame and the sample delivery vehicle support frame. When loading samples, the entire sample delivery flatbed vehicle enters the support device and is fixed to the counterweight support frame; after the detection is completed, it slides back to the sample delivery vehicle support frame.

[0017] Further, a hole is left at the center position of the counterweight, and the pickup is bonded to the center position of the hole and connected to the data acquisition instrument through a data line.

[0018] Further, the drop hammer is placed directly above the counterweight.

[0019] Further, the middle part of the concrete foundation is in a shape that bulges upward, which can effectively support the entire device.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0021] 1. In the traditional experimental method, the way of manually holding a heavy hammer to strike a concrete block is usually adopted. However, when the position of the counterweight is relatively high and the size is relatively large, manual hammering will become difficult; the landing point and force of manual hammering have certain uncertainties, resulting in a large dispersion in the detection results of the same vibration isolator, and the collection of regular data is not available. By setting the drop hammer, the self-gravity and the falling height of the drop hammer both have certain data, and the impact energy and the landing point data can be accurately recorded, which is convenient for specific analysis of the experimental results.

[0022] 2. When conducting the vibration isolator damping ratio experiment, there are many unsafe factors when placing the vibration isolator at the bottom of the counterweight. Especially during the process of lifting the counterweight by a forklift or a crane, there is a risk of the counterweight suddenly falling; and it is very difficult to place the counterweight directly above the vibration isolator at one time, and multiple repeated attempts are required. The present utility model improves the accuracy and safety when placing the vibration isolator and improves the test efficiency by fixing the position of the counterweight and performing the sample delivery and positioning of the vibration isolator sample.

[0023] 3. There is a hole in the middle position of the counterweight block, and the vibration pickup is bonded to the center position of the counterweight block, which can directly measure the vertical displacement of the center position of the counterweight block, avoiding the error of calculating the average value through multiple evenly distributed vibration pickups due to the inability to place the vibration pickup at the hammering point position, and improving the measurement accuracy.

[0024] In summary, the damping ratio detection device of the steel spring isolator based on the free vibration decay method has the advantages of simple operation, reliable control, accurate position, etc. compared with the traditional damping ratio detection device of the isolator, and can improve the accuracy and efficiency of detection. Brief Description of the Drawings

[0025] Figure 1 It is a schematic structural diagram of the damping ratio detection device of the steel spring isolator based on the free vibration decay method of the present utility model.

[0026] Figure 2 It is a usage state diagram of the detection device during the damping ratio detection test of the isolator.

[0027] Description of the reference numerals: 1 - drop hammer, 2 - data acquisition instrument, 3 - vibration pickup, 4 - counterweight block, 5 - counterweight block support frame, 6 - four-column jack, 7 - concrete foundation, 8 - sample delivery flatbed truck, 9 - sample delivery vehicle support frame, 10 - steel spring isolator sample, 11 - pulley; 12 - slide rail. Detailed Description of the Preferred Embodiments

[0028] Embodiment 1

[0029] As Figure 1 shown, the damping ratio detection device of the steel spring isolator based on the free vibration decay method of the present utility model includes a drop hammer 1, a counterweight block 4, a vibration pickup 3 and a data acquisition instrument 2, and further includes the following structures:

[0030] A support device is provided below the counterweight block 4, including a counterweight block support frame 5 that can be separated from the counterweight block 4, a four-column jack 6 that supports the counterweight block support frame 5, and a concrete foundation 7;

[0031] A sample delivery device that is slidable and partially enters the support device; the sample delivery device includes a sample delivery flatbed truck 8 and a sample delivery vehicle support frame 9 that matches the truck.

[0032] A circular hole capable of clamping the steel spring isolator sample 10 is provided at the center of the sample delivery flatbed truck 8, as Figure 1 shown.

[0033] Pulleys 11 are installed on both sides of the lower part of the sample delivery flatbed truck 8, and slide rails 12 are installed on both sides of the upper part of the sample delivery vehicle support frame 9. Slide rails 12 are installed on the counterweight block support frame 5, as Figure 2 shown.

[0034] A hole is left at the center position of the counterweight 4, and the vibration pickup 3 is bonded to the center position of the hole and connected to the data acquisition instrument 2 through a data line.

[0035] A drop hammer 1 is placed directly above the counterweight 4.

[0036] The middle part of the concrete foundation 7 is in a shape that bulges upward, as Figure 1 shown.

[0037] The usage method of the damping ratio detection device for the steel spring vibration isolator based on the self-vibration decay method described in Embodiment 1 includes the following steps:

[0038] (1) The sample delivery flatbed truck 8 is located on the sample delivery vehicle support frame 9, and the vibration isolator sample 10 is placed in the central hole of the flatbed truck 8 through the upper cover plate of the vibration isolator 3;

[0039] (2) Raise the four-column jack 6 to the topmost position. At this time, the slide rail 12 of the counterweight support frame 5 is connected to the sample delivery vehicle support frame 9;

[0040] (3) Push the sample delivery flatbed truck 8 from the sample delivery vehicle support frame 9 onto the counterweight support frame 5;

[0041] (4) Slowly lower the four-column jack 6 to the bottommost position. During this process: the counterweight 4, the counterweight support frame 5, the sample delivery flatbed truck 8, and the vibration isolator sample 10 descend simultaneously. The bottom of the vibration isolator sample 10 contacts the middle convex position of the concrete foundation 7, and the vibration isolator sample 10 is placed in place; the counterweight 4, the counterweight support frame 5, and the sample delivery flatbed truck 8 continue to descend, and the bottom of the counterweight 4 contacts the top of the vibration isolator sample 10; the counterweight 4, the counterweight support frame 5, and the sample delivery flatbed truck 8 continue to descend until the counterweight 4 is completely supported by the vibration isolator sample 10, and the counterweight 4 is separated from the counterweight support frame 5; the counterweight support frame 5 and the sample delivery flatbed truck 8 descend to the bottommost position with the four-column jack 6;

[0042] (5) Start the vibration pickup 3 and the data acquisition instrument 2, release the drop hammer 1 to hammer the center position of the counterweight, and the data acquisition instrument 4 performs damping ratio analysis. Repeat the drop hammer test to obtain multiple groups of test data, and exclude the data with large differences to ensure the accuracy of the test results;

[0043] (6) After a single group of tests is completed, slowly raise the four-column jack 6 to the topmost position. During this process: the counterweight support frame 5 and the sample delivery flatbed truck 8 rise with the four-column jack 6, and the counterweight support frame 5 contacts the counterweight 4; the counterweight 4, the counterweight support frame 5, and the sample delivery flatbed truck 8 continue to rise, and the sample delivery flatbed truck 8 contacts the upper cover plate of the vibration isolator 3; the counterweight 4, the counterweight support frame 5, the sample delivery flatbed truck 8, and the vibration isolator sample 10 rise to the topmost position simultaneously;

[0044] (7) Push the sample delivery flatbed cart 8 from the counterweight support frame 5 onto the sample delivery cart support frame 9;

[0045] (8) Take out the vibration isolator sample 10 from the sample delivery flatbed cart 8 and put in a new steel spring vibration isolator sample 10 for a new test.

[0046] The above has introduced in detail the steel spring vibration isolator damping ratio detection device based on the self-vibration decay method involved in the present utility model. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the solution and its core idea of the present utility model. It should be noted that the present utility model is not limited to the above exemplary embodiments, and those skilled in the art can make various changes and modifications without departing from the scope or spirit of the present utility model. At the same time, for those of ordinary skill in the art, there will be changes in the specific implementation manner and application scope according to the idea of the present utility model; thus, in summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A steel spring isolator damping ratio detection device based on the self-vibration attenuation method, comprising a drop weight, a counterweight, a vibration pickup and a data acquisition instrument, characterized in that: The following structures are also included: A supporting device is provided below the counterweight block, including a counterweight block supporting frame that can be separated from the counterweight block, a four-column jack supporting the counterweight block supporting frame, and a concrete foundation; A sample delivery device which can slide and partially enter the supporting device; the sample delivery device comprises at least one sample delivery flatbed vehicle and a sample delivery vehicle supporting frame matched with the vehicle.

2. The steel spring isolator damping ratio detection device based on the self-vibration attenuation method according to claim 1 is characterized in that: A circular hole capable of clamping the steel spring vibration isolator sample is arranged at the center of the sample delivery flatbed vehicle.

3. The steel spring isolator damping ratio detection device based on the self-vibration attenuation method according to claim 1 is characterized in that: Pulleys are arranged on both sides of the lower part of the sample delivery flatbed trolley, and slide rails are arranged on both sides of the upper part of the sample delivery trolley support frame.

4. The steel spring isolator damping ratio detection device based on the self-vibration attenuation method according to claim 1 is characterized in that: The counterweight support frame is equipped with a slide rail.

5. The steel spring isolator damping ratio detection device based on the self-vibration attenuation method according to claim 1 is characterized in that: A hole is left at the center of the counterweight block, and the vibration pickup is bonded to the center of the hole and connected to the data acquisition instrument via a data line.

6. The steel spring isolator damping ratio detection device based on the self-vibration attenuation method according to claim 1 is characterized in that: The drop weight is placed just above the counterweight block.

7. The steel spring isolator damping ratio detection device based on the self-vibration attenuation method according to claim 1 is characterized in that: The middle part of the concrete foundation is in an upwardly convex shape.

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