Auxiliary fixing device of cable force dynamic tester for bridge

Abstract

The utility model belongs to the technical field of bridge cable force detection, and discloses an auxiliary fixing device of a cable force dynamic tester for a bridge, which comprises a dynamic tester main body, the bottom of the dynamic tester main body is provided with a fixing mechanism used for clamping and fixing the dynamic tester main body, and the dynamic tester main body is provided with a clamping mechanism used for clamping and fixing the dynamic tester main body. One side of the fixing mechanism is provided with a clamping mechanism which is used for rapidly clamping and fixing the dynamic tester main body on the circular cable, and the fixing mechanism is also provided with a holding type telescoping mechanism which is used for installing the dynamic tester main body at different heights. According to the cable force dynamic tester auxiliary fixing device for the bridge, dynamic tester main bodies of different models and sizes can be fixed through the fixing mechanism, the clamping mechanism can quickly clamp the dynamic tester main bodies on a circular cable, and the clamping mechanism is matched with the holding type telescopic mechanism, so that the dynamic tester main bodies can be fixed through the holding type telescopic mechanism. And the dynamic tester main bodies with different mounting heights can be quickly mounted and dismounted.

Description

Technical Field

[0001] This utility model belongs to the field of bridge cable dynamic testing technology, specifically an auxiliary fixing device for a bridge cable dynamic testing instrument. Background Technology

[0002] Dynamic vibration monitoring instruments (VRMIS) are widely used in the dynamic measurement of bridge cables and building structural cables. Their main purpose is to capture vibration signals from the cables and analyze their dynamic characteristic parameters, such as frequency, amplitude, and modes. This data not only reflects the health status of the cables but also provides a scientific basis for the maintenance and management of bridge structures. Therefore, VRMIS plays an indispensable role in the safety monitoring of bridge structures.

[0003] Currently, dynamic testing instruments used for bridge cable stress measurement typically include key components such as sensor assemblies, data acquisition systems, and mounting devices. In actual measurements, the instrument is usually mounted directly on the cable surface using straps or similar fixing structures, ensuring the sensor is in close contact with the cable surface. This allows for real-time sensing of cable vibration and recording of relevant signals. Through data processing and analysis, the magnitude and distribution of cable stress are calculated to assess the cable's stress state and health performance. This measurement method is simple and direct, meeting the basic requirements of most scenarios.

[0004] However, existing dynamic testing instrument designs use straps to directly fix the device to the cable surface, which may have several drawbacks. For example, installation and removal require manual binding and unbinding, which is not only cumbersome but also makes installation more difficult at higher heights when measuring different sensitivities at different heights.

[0005] In summary, the existing method of securing the device by binding has certain drawbacks and urgently needs to be improved. Utility Model Content

[0006] To make the installation and disassembly of the dynamic testing instrument simpler and faster, this utility model provides an auxiliary fixing device for a bridge cable force dynamic testing instrument.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an auxiliary fixing device for a bridge cable force dynamic measuring instrument, comprising a dynamic measuring instrument body, a fixing mechanism for clamping and fixing the dynamic measuring instrument body at the bottom of the dynamic measuring instrument body, a clamping mechanism for quickly clamping and fixing the dynamic measuring instrument body onto a circular cable on one side of the fixing mechanism, and a gripping telescopic mechanism for installing the dynamic measuring instrument body at different heights on the fixing mechanism.

[0008] Preferably, the fixing mechanism includes a placement frame, a compression spring fixedly connected to the inner side of the placement frame, a positioning plate fixedly connected to the outer side of the compression spring, a connecting plate fixedly connected to the outer side of the placement frame, an extension plate fixedly connected to the outer side of the connecting plate, a return spring fixedly connected to the outer side of the extension plate, a clamping plate fixedly connected to the outer side of the return spring, a threaded tube fixedly connected to the outer side of the connecting plate, a screw threadedly connected to the inner side of the threaded tube, and a push rod fixedly connected to the outer side of the screw.

[0009] Preferably, a lifting mechanism is provided on the outer side of the placement frame. The lifting mechanism includes a support rod, a movable tube is movably connected to the bottom of the support rod, a compression spring is fixedly connected to the top of the movable tube, a mounting base is fixedly connected to the bottom of the movable tube, a mounting plate is fixedly connected to the outer side of the mounting base, a motor is fixedly connected to the outer side of the mounting plate, a lead screw is fixedly connected to the output end of the motor, a collar is threaded to the outer side of the lead screw, a connecting rod is fixedly connected to the outer side of the collar, and a lifting groove is provided inside the mounting plate.

[0010] Preferably, the mounting base has an arc-shaped groove on the side away from the main body of the dynamic measuring instrument that fits the surface of the circular cable. The mounting base has insertion interfaces at the two ends corresponding to the arc-shaped groove. The clamping mechanism includes a clamp plate that slides into the corresponding insertion interface. A snap-fit ​​spring is provided in the insertion interface. The snap-fit ​​spring can drive the end of the clamp plate to extend out of the insertion interface.

[0011] Preferably, the mounting base has a slot at the top, the inner wall of the slot is made of magnetic material, the grip-type telescopic mechanism includes a telescopic cylinder, the end of the telescopic cylinder is provided with an electromagnet connector adapted to the slot, an electric telescopic rod is provided inside the telescopic cylinder, and three buttons are provided on the outer wall of the handheld end of the telescopic cylinder, each button controlling the extension and retraction of the electric telescopic rod and controlling the circuit on / off of the electromagnet connector.

[0012] Preferably, the support rods are symmetrically distributed at the bottom of the placement frame, the compression spring is located on the outside of the support rods, and the top of the compression spring is fixedly connected to the bottom of the placement frame.

[0013] Preferably, the mounting base is installed at the bottom of the placement frame via a movable tube, and the mounting plate is located on the outside of the placement frame.

[0014] Preferably, the connecting rod is slidably connected inside the lifting groove, and the end of the connecting rod away from the collar is fixedly connected to the outside of the placement frame.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. This utility model provides an auxiliary fixing device for a bridge cable force dynamic measuring instrument. The fixing mechanism can fix the main body of the dynamic measuring instrument of different models and sizes. The clamping mechanism can quickly clamp the main body of the dynamic measuring instrument on the circular cable. The clamping mechanism, together with the grip-type telescopic mechanism, can realize the quick installation and disassembly of the main body of the dynamic measuring instrument at different installation heights.

[0017] 2. When different measurements are required using dynamic measuring instruments with different sensitivities, the dynamic measuring instrument to be measured is placed inside the placement frame. The positioning plate, under the action of the compression spring, will position the front and rear sides of the dynamic measuring instrument. Then, the screw drives the push rod to move, thereby moving the clamping plate outside the reset spring to the left and right sides of the dynamic measuring instrument. This allows for the fixing of different models of dynamic measuring instruments inside the placement frame, enabling measurements of different accuracies and modes.

[0018] 3. This utility model incorporates a placement frame. After the main body of the dynamic measuring instrument is fixed inside the placement frame, the height of the main body needs to be adjusted. The motor drives the lead screw to rotate, causing the collar to move outside the lead screw, which in turn moves the connecting rod. The connecting rod is fixedly connected to the outside of the placement frame, thus allowing the placement frame to move on top of the base. By adjusting the distance between the main body of the dynamic measuring instrument and the surface of the circular cable, the optimal position for signal transmission can be found, thereby improving the quality and sensitivity of signal acquisition. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the auxiliary fixing device for the dynamic measuring instrument;

[0021] Figure 2 yes Figure 1 A partial structural diagram of the main body of the dynamic measuring instrument;

[0022] Figure 3 yes Figure 2 A partial structural diagram of the area where the frame is placed.

[0023] In the diagram: 1. Main body of the dynamic measuring instrument; 2. Fixing mechanism; 21. Placement frame; 22. Compression spring; 23. Positioning plate; 24. Connecting plate; 25. Extension plate; 26. Return spring; 27. Clamping plate; 28. Threaded tube; 29. ​​Screw; 210. Push rod; 3. Lifting mechanism; 31. Support rod; 32. Movable tube; 33. Compression spring; 34. Mounting base; 341. Arc groove; 342. Clamping plate; 35. Mounting plate; 36. Motor; 37. Lead screw; 38. Collar; 39. Connecting rod; 310. Lifting groove; 4. Telescopic cylinder; 41. Electromagnetic clamp connector; 42. Button. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail below.

[0025] Reference Figure 1 , Figure 2 and Figure 3 This utility model provides an auxiliary fixing device for a bridge cable force dynamic measuring instrument, including a dynamic measuring instrument body 1, and a fixing mechanism 2 is provided at the bottom of the dynamic measuring instrument body 1;

[0026] The fixing mechanism 2 includes a placement frame 21. A compression spring 22 is fixedly connected to the inner side of the placement frame 21. A positioning plate 23 is fixedly connected to the outer side of the compression spring 22. A connecting plate 24 is fixedly connected to the outer side of the placement frame 21. An extension plate 25 is fixedly connected to the outer side of the connecting plate 24. A return spring 26 is fixedly connected to the outer side of the extension plate 25. A clamping plate 27 is fixedly connected to the outer side of the return spring 26. A threaded tube 28 is fixedly connected to the outer side of the connecting plate 24. A screw 29 is threadedly connected inside the threaded tube 28. A push rod 210 is fixedly connected to the outer side of the screw 29.

[0027] Specifically, the main body 1 of the dynamic measuring instrument is located inside the placement frame 21, and the positioning plate 23 is symmetrically distributed inside the placement frame 21 by compression springs 22.

[0028] Reference Figure 1 , Figure 2 and Figure 3The main body 1 of the cable force dynamic testing instrument receives a composite signal from the cable vibration signal, which is composed of multi-harmonic vibration signals. Multiple peak frequency points will appear in the spectrum analysis diagram, each corresponding to a natural frequency. After acquiring the signal, the cable force dynamic testing instrument quickly and automatically performs a Fourier transform and displays the spectrum. Simultaneously, the highest frequency of the peak points is recorded as the principal oscillation frequency, denoted as fn. Because some orders of vibration signals are extremely weak during actual cable vibration and cannot be observed in the spectrum, the distances between some adjacent peak points are not equidistant. Therefore, the minimum distance between adjacent peak points is taken as the fundamental frequency f1. The ratio fn / f1 is the order corresponding to the principal oscillation frequency fn. The cable force dynamic testing instrument automatically calculates the value of n. However, due to external environmental constraints during testing, a standard spectrum may not be available, leading to inaccurate n values. In this case, manual calculation based on the spectrum can be performed. Confirm the n value and input the correct value directly into the instrument's parameter field. Finally, the instrument will automatically calculate the cable tension F based on the cable force calculation formula and the input parameters W and L.

[0029] Furthermore, the connecting plates 24 are symmetrically distributed on the outside of the placement frame 21, and the clamping plate 27 is movably connected to the top of the placement frame 21 through the return spring 26. By moving the clamping plate 27 to the left and right sides of the moving instrument body 1, the moving instrument body 1 can be clamped.

[0030] Reference Figure 1 , Figure 2 and Figure 3 The screw 29 passes through the interior of the connecting plate 24, and the push rod 210 is movably connected to the outside of the clamping plate 27 through the screw 29. The screw 29 rotates and moves inside the threaded tube 28, thereby driving the push rod 210 to move, which can then push the clamping plate 27.

[0031] It is worth noting that a lifting mechanism 3 is provided on the outside of the placement frame 21. The lifting mechanism 3 includes a support rod 31, a movable tube 32 is movably connected to the bottom of the support rod 31, a pressure spring 33 is fixedly connected to the top of the movable tube 32, a mounting base 34 is fixedly connected to the bottom of the movable tube 32, a mounting plate 35 is fixedly connected to the outside of the mounting base 34, a motor 36 is fixedly connected to the outside of the mounting plate 35, a lead screw 37 is fixedly connected to the output end of the motor 36, a collar 38 is threadedly connected to the outside of the lead screw 37, a connecting rod 39 is fixedly connected to the outside of the collar 38, and a lifting groove 310 is opened inside the mounting plate 35.

[0032] Reference Figure 1 , Figure 2 and Figure 3Support rods 31 are symmetrically distributed at the bottom of the placement frame 21. Compression springs 33 are located on the outside of support rods 31, and the top of compression springs 33 is fixedly connected to the bottom of the placement frame 21. Compression springs 33 are in a compressed state, and the placement frame 21 can always remain stable during lifting and adjusting.

[0033] It is worth emphasizing that the mounting base 34 is installed at the bottom of the placement frame 21 through the movable tube 32, and the mounting plate 35 is located on the outside of the placement frame 21. The mounting base 34 can support the dynamic measuring instrument body 1 inside the placement frame 21. The connecting rod 39 is slidably connected inside the lifting groove 310, and the end of the connecting rod 39 away from the collar 38 is fixedly connected to the outside of the placement frame 21.

[0034] To enable quick connection and disconnection of mounting bracket 34 with round cables, refer to... Figure 1 , Figure 2 and Figure 3 The mounting base 34 is provided with a clamping mechanism for quickly mounting the main body 1 of the dynamic measuring instrument onto the circular cable. The side of the mounting base 34 away from the main body 1 of the dynamic measuring instrument is provided with an arc-shaped groove 341 that fits the surface of the circular cable. The two ends of the mounting base 34 corresponding to the arc-shaped groove 341 are respectively provided with insertion interfaces. The clamping mechanism includes a clamping plate 342 that slides into the corresponding insertion interface. A snap-fit ​​spring is provided in the insertion interface. The snap-fit ​​spring can drive the end of the clamping plate 342 to extend out of the insertion interface.

[0035] When it is necessary to clamp the mounting base 34 onto the round cable, align the arc groove 341 on the mounting base 34 with the round cable and press firmly to retract the two clamping plates 342 into the arc groove 341. At this time, the inner wall of the arc groove 341 is in contact with the surface of the round cable, and the two clamping plates 342 are reset under the action of the clamping spring, thus achieving clamping and fixing of the mounting base 34.

[0036] Since the main body 1 of the dynamic testing instrument sometimes needs to be installed at a high position on the circular cable, for ease of installation, refer to... Figure 1 , Figure 2 and Figure 3 The mounting base 34 is provided with a gripping telescopic mechanism, and a slot is provided at the top of the mounting base 34. The inner wall of the slot is made of magnetic material, such as iron, cobalt, nickel, etc. In this application, it is made of iron.

[0037] The grip-type telescopic mechanism includes a telescopic cylinder 4, with an electromagnet connector 41 adapted to the slot at the end of the telescopic cylinder 4. An electric telescopic rod is installed inside the telescopic cylinder 4. Three buttons 42 are installed on the outer wall of the hand-held end of the telescopic cylinder 4, namely, a button 42 for controlling the extension and retraction of the electric telescopic rod, and a button 42 for controlling the on / off circuit of the electromagnet connector 41.

[0038] When it is necessary to install the main body 1 of the dynamic measuring instrument at a higher position on the circular cable, press the extension button 42 of the electric telescopic rod to extend the end of the telescopic cylinder 4, thereby extending the main body 1 of the dynamic measuring instrument to the required installation position. After forcefully snapping the mounting base 34 onto the circular cable, press the button 42 corresponding to the electromagnet clamp 41 to de-energize the electromagnet clamp 41. Remove the electromagnet clamp 41 from the slot to complete the installation of the main body 1 of the dynamic measuring instrument.

[0039] Working principle and process: First, the main body 1 of the dynamic measuring instrument is placed inside the placement frame 21. Since the positioning plate 23 is symmetrically distributed inside the placement frame 21 through the compression spring 22, the positioning plate 23 can position the main body 1 of the dynamic measuring instrument inside the placement frame 21 on both the front and back sides. Then, by rotating the screw 29, the screw 29 rotates inside the threaded tube 28, thereby moving the screw 29. At this time, the screw 29 will drive the push rod 210 to move. The movement of the push rod 210 can push the clamping plate 27 outside the reset spring 26, so that the clamping plate 27 moves to the left and right sides of the main body 1 of the dynamic measuring instrument, thereby clamping the left and right sides of the main body 1 of the dynamic measuring instrument and preventing the main body 1 of the dynamic measuring instrument from shaking inside the placement frame 21.

[0040] When the height of the main body 1 of the dynamic measuring instrument needs to be adjusted, the motor 36 is started, which drives the lead screw 37 to rotate. Since a collar 38 is threaded on the outside of the lead screw 37, and a connecting rod 39 is fixedly connected to the outside of the collar 38, and the connecting rod 39 is slidably connected inside the lifting groove 310, it can limit the collar 38. When the lead screw 37 rotates, it can drive the collar 38 to move on the outside of the lead screw 37, which in turn causes the connecting rod 39 to drive the placement frame 21 to move. Since a support rod 31 is fixedly connected to the bottom of the placement frame 21, the height adjustment of the placement frame 21 can be made more stable through the pressure of the compression spring 33.

[0041] Press the extension button 42 of the electric telescopic rod to extend the end of the telescopic cylinder 4, thereby extending the main body 1 of the dynamic measuring instrument to the required installation position. After forcefully snapping the mounting base 34 onto the circular cable, press the button 42 corresponding to the electromagnet connector 41 to de-energize the electromagnet connector 41. Remove the electromagnet connector 41 from the slot to complete the installation of the main body 1 of the dynamic measuring instrument.

[0042] The above are all optional embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An auxiliary fixing device for a bridge cable force dynamic testing instrument, comprising a main body of the dynamic testing instrument (1), characterized in that: The bottom of the dynamic measuring instrument body (1) is provided with a fixing mechanism (2) for clamping and fixing the dynamic measuring instrument body (1). On one side of the fixing mechanism (2) is a clamping mechanism for quickly clamping and fixing the dynamic measuring instrument body (1) onto a circular cable. The fixing mechanism (2) is also provided with a gripping telescopic mechanism for installing the dynamic measuring instrument body (1) at different heights.

2. The auxiliary fixing device for a bridge cable force dynamic measuring instrument according to claim 1, characterized in that: The fixing mechanism (2) includes a placement frame (21), a compression spring (22) is fixedly connected to the inner side of the placement frame (21), a positioning plate (23) is fixedly connected to the outer side of the compression spring (22), a connecting plate (24) is fixedly connected to the outer side of the placement frame (21), an extension plate (25) is fixedly connected to the outer side of the connecting plate (24), a return spring (26) is fixedly connected to the outer side of the extension plate (25), a clamping plate (27) is fixedly connected to the outer side of the return spring (26), a threaded tube (28) is fixedly connected to the outer side of the connecting plate (24), a screw (29) is threaded inside the threaded tube (28), and a push rod (210) is fixedly connected to the outer side of the screw (29).

3. The auxiliary fixing device for a bridge cable force dynamic measuring instrument according to claim 2, characterized in that: A lifting mechanism (3) is provided on the outside of the placement frame (21). The lifting mechanism (3) includes a support rod (31). The bottom of the support rod (31) is movably connected to a movable tube (32). The top of the movable tube (32) is fixedly connected to a pressure spring (33). The bottom of the movable tube (32) is fixedly connected to a mounting base (34). The outside of the mounting base (34) is fixedly connected to a mounting plate (35). The outside of the mounting plate (35) is fixedly connected to a motor (36). The output end of the motor (36) is fixedly connected to a lead screw (37). The outside of the lead screw (37) is threaded with a collar (38). The outside of the collar (38) is fixedly connected to a connecting rod (39). The inside of the mounting plate (35) is provided with a lifting groove (310).

4. The auxiliary fixing device for a bridge cable force dynamic measuring instrument according to claim 3, characterized in that: The mounting base (34) has an arc-shaped groove (341) on the side away from the main body (1) of the dynamic measuring instrument, which fits the surface of the circular cable. The mounting base (34) has two insertion interfaces at the two ends corresponding to the arc-shaped groove (341). The clamping mechanism includes a clamp plate (342) that slides into the corresponding insertion interface. A snap-fit ​​spring is provided in the insertion interface. The snap-fit ​​spring can drive the end of the clamp plate (342) to extend out of the insertion interface.

5. The auxiliary fixing device for a bridge cable force dynamic measuring instrument according to claim 3, characterized in that: The mounting base (34) has a slot at the top, the inner wall of the slot is made of magnetic material, the grip-type telescopic mechanism includes a telescopic cylinder (4), the end of the telescopic cylinder (4) is provided with an electromagnet connector (41) adapted to the slot, the telescopic cylinder (4) is provided with an electric telescopic rod, and the outer wall of the hand-held end of the telescopic cylinder (4) is provided with three buttons (42), each of the buttons (42) controls the extension and retraction of the electric telescopic rod and controls the circuit opening and closing of the electromagnet connector (41).

6. The auxiliary fixing device for a bridge cable force dynamic measuring instrument according to claim 3, characterized in that: The support rods (31) are symmetrically distributed at the bottom of the placement frame (21), the compression spring (33) is located on the outside of the support rods (31), and the top of the compression spring (33) is fixedly connected to the bottom of the placement frame (21).

7. The auxiliary fixing device for a bridge cable force dynamic measuring instrument according to claim 3, characterized in that: The mounting base (34) is installed at the bottom of the placement frame (21) via the movable tube (32), and the mounting plate (35) is located on the outside of the placement frame (21).

8. The auxiliary fixing device for a bridge cable force dynamic measuring instrument according to claim 3, characterized in that: The connecting rod (39) is slidably connected inside the lifting groove (310), and the end of the connecting rod (39) away from the collar (38) is fixedly connected to the outside of the placement frame (21).

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