Bridge free vibration excitation device

Abstract

The utility model provides a kind of bridge free vibration excitation device, it is related to the technical field of bridge engineering, comprising: abutment component, support component, first driving part and clamping component;Abutment component is butted in the end of main girder, abutment component is slidably connected with support component, clamping component is clamped on abutment component, so that abutment component is fixed with support component;First driving part is fixed on support component, the output end of first driving part is connected with clamping component, first driving part is used to drive clamping component and abutment component separate, so that abutment component can slide relative to support component, the two ends of main girder are supported by support component and abutment component, and by first driving part cooperation clamping component movement, abutment component is withdrawn, so that the two ends of main girder lose support and start to vibrate, vibration effect is better, solve the technical problem that the excitation test effect is poor in the prior art, reach the technical effect that excitation test effect is better without driving vehicle on bridge.

Description

Technical Field

[0001] This utility model relates to the field of bridge engineering technology, and in particular to a bridge free vibration excitation device. Background Technology

[0002] Vibration excitation is a core technology in civil engineering that applies dynamic loads to structures mechanically or via pulses. This technology is widely used in applications such as force-frequency conversion using steel-string sensors, determination of structural dynamics test parameters, and pile integrity detection. Vibration excitation methods include two typical modes: intermittent triggering and continuous constant amplitude. Mode shape analysis can be used to study the engineering applications of vibration isolation technology and vibration measurement instruments.

[0003] The commonly used vibration test method for bridges is the jump test, which involves placing multiple obstacles on the bridge and allowing vehicles to pass over it at a certain speed. When a vehicle passes over an obstacle, it jumps, generating a continuous impact load that causes the bridge to vibrate. However, for bridge structures in a cantilever state during the construction period, the number of consecutive jumps is limited by the span. In addition, vehicles traveling on the bridge can easily affect the bridge's vibration, resulting in poor vibration test results. Utility Model Content

[0004] The purpose of this invention is to provide a bridge free vibration excitation device to alleviate the technical problem of poor excitation test effect in the prior art.

[0005] This utility model provides a bridge free vibration excitation device for conducting excitation tests on main beams, comprising: an abutment component, a support component, a first driving component, and a snap-fit ​​component; The abutting component abuts against the end of the main beam, the abutting component is slidably connected to the supporting component, and the snap-fit ​​component snaps onto the abutting component, thereby fixing the abutting component to the supporting component; The first driving member is fixed on the support component. The output end of the first driving member is connected to the snap-fit ​​component. The first driving member is used to drive the snap-fit ​​component to separate from the abutment component, so that the abutment component can slide relative to the support component.

[0006] In an optional implementation, a second drive element and a support plate are also included; The second driving member is disposed on one side of the first driving member. The axis of the second driving member and the axis of the first driving member are both perpendicular to the main beam. The driving end of the second driving member is connected to the support plate, and the other end of the second driving member is connected to the support assembly.

[0007] In an optional embodiment, the support assembly includes a support base, support legs, and a connecting plate; The support legs are arranged around the first driving member, and the two ends of the support legs are respectively connected to the support base and the connecting plate. The connecting plate is arranged parallel to the support base and is slidably connected to the abutment component. One end of the first driving member is connected to the support base, and the other end of the first driving member passes through the connecting plate and is connected to the snap-fit ​​assembly.

[0008] In an optional embodiment, the connecting plate is provided with a through hole, and the abutting component passes through the through hole and is slidably connected to the connecting plate.

[0009] In an optional embodiment, the abutting assembly includes an abutting plate and sliding rods. The number of sliding rods is the same as the number of through holes. The multiple sliding rods are arranged parallel to each other, and each of the multiple sliding rods is arranged perpendicular to the abutting plate. One end of each of the multiple sliding rods is connected to the abutting plate. The abutment plate is arranged parallel to the connecting plate.

[0010] In an optional embodiment, a limiting ring is provided on the sliding rod, the limiting ring is fixedly connected to the sliding rod, the diameter of the limiting ring is smaller than the diameter of the through hole, and the limiting ring abuts against the snap-fit ​​assembly to fix the sliding rod.

[0011] In an optional embodiment, the snap-fit ​​assembly includes a pull strap and an abutment bracket, each abutment bracket being disposed on a sliding rod, and each abutment bracket having its two sides abutting against a limiting ring and a connecting plate, respectively; The pull strap is connected to the output end of the first drive member, and the pull strap is connected to each of the abutment frames respectively. The first drive member can pull the multiple abutment frames away from the sliding rod through the pull strap, so that the sliding rod slides relative to the connecting plate.

[0012] In an optional embodiment, a control board is also included, which is connected to the end of each of the pull straps away from the abutment frame, and the control board is connected to the output end of the first drive member.

[0013] In an optional embodiment, a limiting frame is provided on the connecting plate, the limiting frame covers the pull belt, the limiting frame is connected to the connecting plate, and the limiting frame is used to limit the movement path of the pull belt.

[0014] In an optional embodiment, the snap-fit ​​assembly further includes a ball bearing and a groove; The rolling ball is disposed on the abutment frame, and the abutment frame is slidably connected to the connecting plate and the limiting ring respectively through the rolling ball; The connecting plate is provided with the groove, the extension direction of the groove is the same as the movement direction of the pull belt, and the rolling ball is slidably connected to the groove.

[0015] This utility model provides a bridge free vibration excitation device for conducting vibration tests on main beams. It includes: an abutment component, a support component, a first driving component, and a locking component. The abutment component abuts against the end of the main beam and is slidably connected to the support component. The locking component locks onto the abutment component, fixing the abutment component to the support component. The first driving component is fixed on the support component, and its output end is connected to the locking component. The first driving component drives the locking component to separate from the abutment component, allowing the abutment component to slide relative to the support component. The support component and the abutment component support the two ends of the main beam. The first driving component, in conjunction with the movement of the locking component, causes the abutment component to retract, causing the two ends of the main beam to lose support and begin vibrating. This results in a better vibration effect and solves the technical problem of poor vibration test performance in existing technologies. It achieves the technical effect of better vibration test performance without requiring vehicles to drive on the bridge. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of the bridge free vibration excitation device and the main beam provided in this embodiment of the utility model; Figure 2 A schematic diagram of the structure of the bridge free vibration excitation device provided in this embodiment of the utility model; Figure 3 for Figure 2 The main view; Figure 4 for Figure 2 A schematic diagram of a partial structure; Figure 5 for Figure 2 A schematic diagram of a localized explosion structure.

[0018] Icons: 1-Support base; 2-Second drive component; 21-Support plate; 3-First drive component; 31-Control plate; 32-Limit frame; 33-Pull strap; 34-Abutment frame; 35-Rolling ball; 36-Groove; 4-Support leg; 41-Connecting plate; 42-Through hole; 5-Sliding rod; 51-Abutment plate; 52-Limit ring; 6-Main beam; 7-Support frame. Detailed Implementation

[0019] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0023] In related technologies, the commonly used vibration test method for bridges is the vehicle jump method, which involves placing multiple obstacles on the bridge and allowing vehicles to pass over the bridge at a certain speed. When the vehicles pass over the obstacles, they jump, thereby generating continuous impact loads that cause the bridge to vibrate. However, for bridge structures in a cantilever state during the construction period, the number of consecutive vehicle jumps is limited by the span. At the same time, vehicles traveling on the bridge can easily affect the bridge's vibration, resulting in poor vibration test results.

[0024] In view of this, such as Figures 1-5As shown in some embodiments of this utility model, a bridge free vibration excitation device is provided for excitation testing of a main beam 6. The device includes: an abutment component, a support component, a first driving component 3, and a snap-fit ​​component. The abutment component abuts against the end of the main beam 6 and is slidably connected to the support component. The snap-fit ​​component snaps onto the abutment component, fixing the abutment component to the support component. The first driving component 3 is fixed on the support component, and its output end is connected to the snap-fit ​​component. The first driving component 3 is used to drive the snap-fit ​​component to separate from the abutment component, allowing the abutment component to slide relative to the support component.

[0025] In the above embodiments, the snap-fit ​​component, the abutment component, and the support component can all be made of metal. The first driving component 3 can be a hydraulic cylinder. The output end of the first driving component 3 is connected to the snap-fit ​​component, so that the snap-fit ​​component moves relative to the support component through the first driving component 3. The abutment component abuts against the lower side of the main beam 6 and causes the end of the main beam 6 to tilt up. When the output end of the first driving component 3 moves and drives the snap-fit ​​component to move, the snap-fit ​​component separates from the abutment component. At this time, the abutment component loses its fixation and begins to move relative to the support component, so that the abutment component can release the end of the main beam 6 in time, while avoiding the impact on the vibration of the main beam 6. The support component can be fixed on the support frame 7 and can be set on the upper surface of the support frame 7.

[0026] The clamping component, the abutment component, the first driving component 3, and the support component can each be provided in twos. A clamping component, an abutment component, the first driving component 3, and a support component are respectively provided at both ends of the main beam 6. At the same time, both ends of the main beam 6 are lifted, causing the main beam 6 to tilt up and then suddenly released, so that the vibration test effect of the main beam 6 is better.

[0027] The method of raising the abutment component may include a separately provided cylinder, hydraulic cylinder or other driving device. After the abutment component is raised, it is locked in place by a locking component, and the driving device is retracted to avoid affecting the movement path of the locking component.

[0028] This utility model provides a bridge free vibration excitation device for conducting vibration tests on a main beam 6. It includes: an abutment component, a support component, a first driving component 3, and a locking component. The abutment component abuts against the end of the main beam 6 and is slidably connected to the support component. The locking component locks onto the abutment component, fixing the abutment component to the support component. The first driving component 3 is fixed on the support component, and its output end is connected to the locking component. The first driving component 3 drives the locking component to separate from the abutment component, allowing the abutment component to slide relative to the support component. The support component and the abutment component support the two ends of the main beam 6. The first driving component 3, in conjunction with the locking component, moves to retract the abutment component, causing the two ends of the main beam 6 to lose support and begin vibration. This results in a better vibration effect, solving the technical problem of poor vibration test performance in existing technologies and achieving a better vibration test effect without requiring vehicles to drive on the bridge.

[0029] In an optional embodiment, it further includes a second driving member 2 and a support plate 21; the second driving member 2 is disposed on one side of the first driving member 3, the axis of the second driving member 2 and the axis of the first driving member 3 are both perpendicular to the main beam 6, the driving end of the second driving member 2 is connected to the support plate 21, and the other end of the second driving member 2 is connected to the support assembly.

[0030] In the above embodiment, the second driving component 2 can also be a hydraulic cylinder. The axis of the second driving component 2 is parallel to the axis of the first driving component 3. The output end of the second driving component 2 is located close to the main beam 6. The output end of the second driving component 2 is connected to a support plate 21. The support plate 21 can be made of metal and can be rectangular. The support plate 21 abuts against the main beam 6. The two ends of the main beam 6 are first lifted by the second driving component 2 and the support plate 21, and then abutted against the main beam 6 by the abutting component. Then, it is snapped onto the abutting component by the snapping component to fix the abutting component. Then, the second driving component 2 retracts the support plate 21 to avoid the support plate 21 affecting the vibration test of the main beam 6.

[0031] In an optional embodiment, the support assembly includes a support base 1, support legs 4, and a connecting plate 41; the support legs 4 are disposed around the first driving member 3, and the two ends of the support legs 4 are respectively connected to the support base 1 and the connecting plate 41. The connecting plate 41 is arranged parallel to the support base 1 and is slidably connected to the abutment assembly; one end of the first driving member 3 is connected to the support base 1, and the other end of the first driving member 3 passes through the connecting plate 41 and is connected to the snap-fit ​​assembly.

[0032] In the above embodiment, the support base 1 is elongated and connected to the first driving member 3 and the second driving member 2 respectively. Four support legs 4 are connected to the side of the support base 1 near the main beam 6. The four support legs 4 are all elongated and of the same length. The four support legs 4 are evenly arranged around the first driving member 3. A connecting plate 41 is connected to the end of the four support legs 4 away from the support base 1. The connecting plate 41 is cuboid and is fixedly connected to the four support legs 4. The connecting plate 41 is slidably connected to the abutment component. The snap-fit ​​component is provided on the connecting plate 41. The connecting plate 41 is provided with a hole for the output end of the first driving member 3 to pass through, so that the output end of the first driving member 3 can be connected to the abutment component.

[0033] In an optional embodiment, the connecting plate 41 is provided with a through hole 42, and the abutment component passes through the through hole 42 and is slidably connected to the connecting plate 41.

[0034] In the above embodiment, the connecting plate 41 is provided with a circular through hole 42. The through hole 42 is provided through the connecting plate 41 along the axial direction of the first driving member 3. There can be four through holes 42, which are arranged in a rectangle. The abutting component passes through the four through holes 42 respectively and slides with the connecting plate 41. The snap-fit ​​component is provided close to the four through holes 42. The snap-fit ​​component snaps into the abutting component at the through hole 42, so that the abutting component is fixed.

[0035] In an optional embodiment, the abutting component includes an abutting plate 51 and sliding rods 5. The number of sliding rods 5 is the same as the number of through holes 42. The multiple sliding rods 5 are arranged parallel to each other and are all perpendicular to the abutting plate 51. One end of each of the multiple sliding rods 5 is connected to the abutting plate 51. The abutting plate 51 is arranged parallel to the connecting plate 41.

[0036] In the above embodiment, four sliding rods 5 are provided. The four sliding rods 5 are parallel to each other and arranged in a rectangular shape. Each sliding rod 5 passes through a circular hole and slides. The abutment plate 51 can be rectangular and can be connected to the four sliding rods 5 respectively. The abutment plate 51 is arranged parallel to the connecting plate 41 and is used to abut against the main beam 6. When the snap-fit ​​assembly is separated from the sliding rod 5, the sliding rod 5 begins to pass through the through hole 42 and slides. At this time, the abutment plate 51 moves down quickly under the action of gravity to prevent the abutment plate 51 from hindering the end vibration of the main beam 6.

[0037] In an optional embodiment, a limiting ring 52 is provided on the sliding rod 5. The limiting ring 52 is fixedly connected to the sliding rod 5. The diameter of the limiting ring 52 is smaller than the diameter of the through hole 42. The limiting ring 52 abuts against the snap-fit ​​assembly, thereby fixing the sliding rod 5.

[0038] In the above embodiment, the limiting ring 52 can be made of metal or a snap ring. The limiting ring 52 can be detachably connected to the sliding rod 5. After the second driving member 2 and the support plate 21 support the main beam 6, the sliding rod 5 and the abutment plate 51 are lifted manually or by a driving device so that the abutment plate 51 abuts against the main beam 6. A snap-fit ​​assembly is connected to each sliding rod 5. Then, the limiting ring 52 is set according to the position of the snap-fit ​​assembly. After the second driving member 2 and the support plate 21 are withdrawn, the sliding rod 5 is snapped by the limiting ring 52 and the snap-fit ​​assembly, preventing the sliding rod 5 and the abutment plate 51 from moving on their own under the action of the main beam 6 and gravity.

[0039] Furthermore, the diameter of the limiting ring 52 is smaller than the diameter of the through hole 42, so that during the movement of the sliding rod 5, the limiting ring 52 is prevented from abutting against the connecting plate 41 to restrict the movement of the sliding rod 5.

[0040] In an optional embodiment, the snap-fit ​​assembly includes a pull strap 33 and an abutment frame 34. Each abutment frame 34 is disposed on a sliding rod 5. Each abutment frame 34 abuts against a limiting ring 52 and a connecting plate 41 on both sides. The pull strap 33 is connected to the output end of the first driving member 3. The pull strap 33 is connected to each abutment frame 34. The first driving member 3 can pull multiple abutment frames 34 away from the sliding rod 5 through the pull strap 33, so that the sliding rod 5 slides relative to the connecting plate 41.

[0041] In the above embodiment, the pull strap 33 can be made of flexible woven material, and the abutment frame 34 can be made of metal. The abutment frame 34 can be U-shaped with an opening on one side. The opening of the abutment frame 34 is larger than the diameter of the sliding rod 5, and the width of the abutment frame 34 is larger than the diameter of the through hole 42 to prevent the abutment frame 34 from falling into the through hole 42. Abutment frames 34 are respectively provided on the four sliding rods 5. The upper end of the abutment frame 34 abuts against the limiting ring 52, and the lower end abuts against the connecting plate 41. The connection between the pull strap 33 and the abutment frame 34 is as follows: The position is far from the opening, so that when the pull strap 33 pulls the abutment frame 34, the abutment frame 34 can separate from the sliding rod 5 through the opening. After the abutment frame 34 separates from the limiting ring 52, the sliding rod 5 can start to move, thereby completing the falling of the abutment plate 51. The pull strap 33 can be I-shaped and can connect four abutment frames 34. At the same time, the output end of the first drive member 3 can be connected to the center position of the pull strap 33. The four abutment frames 34 are pulled by the extension of the first output member, thereby realizing the movement of the abutment frame 34.

[0042] Optionally, the first driving component 3 can also be a motor, which can be used to pull the four abutment frames 34 by winding the first driving component 3 around the pull belt 33.

[0043] In an optional embodiment, a control board 31 is also included, which is connected to the end of each pull strap 33 away from the abutment frame 34, and the control board 31 is connected to the output end of the first drive member 3.

[0044] In the above embodiment, the control plate 31 can be made of metal. The control plate 31 is set perpendicular to the axis of the first drive member 3 and is set parallel to the connecting plate 41. The control plate 31 is connected to four pull straps 33 respectively. The first drive member 3 extends the control plate 31 and pulls the four pull straps 33, thereby realizing the movement of the abutment frame 34.

[0045] In an optional embodiment, a limiting frame 32 is provided on the connecting plate 41, the limiting frame 32 covers the pull strap 33, the limiting frame 32 is connected to the connecting plate 41, and the limiting frame 32 is used to limit the movement path of the pull strap 33.

[0046] In the above embodiment, the limiting frame 32 can be inverted U-shape. The limiting frame 32 is fastened to the connecting plate 41 and can be fixedly connected to the connecting plate 41. The hole formed by the limiting frame 32 and the connecting plate 41 allows the pull strap 33 to extend into it. Thus, the limiting frame 32 can restrict the movement path of the pull strap 33, so that the pulling force on the abutment frame 34 is parallel to the surface of the connecting plate 41, making it easier for the abutment frame 34 to move.

[0047] In an optional embodiment, the snap-fit ​​assembly further includes a ball bearing 35 and a groove 36; the ball bearing 35 is disposed on the abutment frame 34, and the abutment frame 34 is slidably connected to the connecting plate 41 and the limiting ring 52 respectively through the ball bearing 35; the connecting plate 41 is provided with a groove 36, the extension direction of the groove 36 is the same as the movement direction of the pull strap 33, and the ball bearing 35 is slidably connected to the groove 36.

[0048] In the above embodiment, the rolling ball 35 can be made of metal. Multiple rolling balls 35 are provided at both the upper and lower ends of each abutment frame 34. The rolling balls 35 can be embedded in the abutment frame 34 to prevent them from falling off by themselves. The abutment frame 34 slides with the connecting plate 41 and the limiting ring 52 respectively through the rolling balls 35 at the upper and lower ends, thereby making it easier to pull when the pull belt 33 is pulled. Furthermore, the connecting plate 41 is provided with a groove 36 with a semi-circular or smaller cross section. The length direction of the groove 36 is the movement direction of the pull belt 33, so that the abutment frame 34 is more stable and the movement direction is more accurate when the pull belt 33 pulls the abutment frame 34.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A bridge free vibration excitation device for conducting vibration tests on a main beam (6), characterized in that, include: Abutting component, supporting component, first driving component (3) and snap-fit ​​component; The abutting component abuts against the end of the main beam (6), the abutting component is slidably connected to the supporting component, and the snap-fit ​​component snaps onto the abutting component, thereby fixing the abutting component to the supporting component; The first driving member (3) is fixed on the support component. The output end of the first driving member (3) is connected to the snap-fit ​​component. The first driving member (3) is used to drive the snap-fit ​​component to separate from the abutting component, so that the abutting component can slide relative to the support component.

2. The bridge free vibration excitation device according to claim 1, characterized in that, It also includes a second drive unit (2) and a support plate (21); The second driving member (2) is disposed on one side of the first driving member (3). The axis of the second driving member (2) and the axis of the first driving member (3) are both perpendicular to the main beam (6). The driving end of the second driving member (2) is connected to the support plate (21), and the other end of the second driving member (2) is connected to the support assembly.

3. The bridge free vibration excitation device according to claim 1, characterized in that, The support assembly includes a support base (1), support legs (4) and a connecting plate (41). The support leg (4) is arranged around the first drive member (3). The two ends of the support leg (4) are respectively connected to the support base (1) and the connecting plate (41). The connecting plate (41) is arranged parallel to the support base (1) and is slidably connected to the abutting component. One end of the first drive member (3) is connected to the support base (1), and the other end of the first drive member (3) passes through the connecting plate (41) and is connected to the snap-fit ​​assembly.

4. The bridge free vibration excitation device according to claim 3, characterized in that, The connecting plate (41) is provided with a through hole (42), and the abutting component passes through the through hole (42) and is slidably connected to the connecting plate (41).

5. The bridge free vibration excitation device according to claim 4, characterized in that, The abutting assembly includes an abutting plate (51) and sliding rods (5). The number of sliding rods (5) is the same as the number of through holes (42). The multiple sliding rods (5) are arranged parallel to each other. The multiple sliding rods (5) are all arranged perpendicular to the abutting plate (51). One end of the multiple sliding rods (5) is connected to the abutting plate (51). The abutment plate (51) is arranged parallel to the connecting plate (41).

6. The bridge free vibration excitation device according to claim 5, characterized in that, A limiting ring (52) is provided on the sliding rod (5). The limiting ring (52) is fixedly connected to the sliding rod (5). The diameter of the limiting ring (52) is smaller than the diameter of the through hole (42). The limiting ring (52) abuts against the snap-fit ​​assembly, so that the sliding rod (5) is fixed.

7. The bridge free vibration excitation device according to claim 6, characterized in that, The snap-fit ​​assembly includes a pull strap (33) and an abutment bracket (34). Each abutment bracket (34) is disposed on a sliding rod (5). Each abutment bracket (34) abuts against a limiting ring (52) and a connecting plate (41) on both sides. The pull strap (33) is connected to the output end of the first drive member (3), and the pull strap (33) is connected to each of the abutment brackets (34). The first drive member (3) can pull multiple abutment brackets (34) away from the sliding rod (5) through the pull strap (33), so that the sliding rod (5) slides relative to the connecting plate (41).

8. The bridge free vibration excitation device according to claim 7, characterized in that, It also includes a control board (31) connected to one end of each of the pull straps (33) away from the abutment frame (34), and the control board (31) is connected to the output end of the first drive member (3).

9. The bridge free vibration excitation device according to claim 7, characterized in that, A limiting frame (32) is provided on the connecting plate (41). The limiting frame (32) covers the pull belt (33). The limiting frame (32) is connected to the connecting plate (41). The limiting frame (32) is used to limit the movement path of the pull belt (33).

10. The bridge free vibration excitation device according to claim 7, characterized in that, The snap-fit ​​assembly also includes a ball bearing (35) and a groove (36). The rolling ball (35) is disposed on the abutment frame (34), and the abutment frame (34) is slidably connected to the connecting plate (41) and the limiting ring (52) respectively through the rolling ball (35); The connecting plate (41) is provided with the groove (36), the extension direction of the groove (36) is the same as the movement direction of the pull belt (33), and the rolling ball (35) is slidably connected to the groove (36).

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