Pile column component modal test excitation system

Abstract

The present application relates to a kind of pile column component modal test excitation system, including bearing frame, annular walking car, excitation device and lifting driving mechanism;The annular track is provided on the bearing frame, the bearing frame and annular track are set to the circumference outside of pile column component, the excitation device is carried on annular walking car, annular walking car is installed on annular track, to move along the circumference outside of pile column component by annular walking car drive excitation device;The working end of excitation device is towards pile column component to exert excitation on pile column component;The bearing frame is installed on lifting driving mechanism, to drive bearing frame and its annular walking car, excitation device lifting by lifting driving mechanism.The system is high in degree of automation, not only time-saving and labor-saving, but also improve excitation precision and efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of test modal analysis, and particularly relates to a pile column component modal test excitation system. BACKGROUND

[0002] Modal test, also known as test modal analysis, is a vibration test for determining modal parameters of a linear vibration system. Many times, health monitoring needs to be performed on a structure in operation, such as a mechanical device, a bridge, and other large structures. Modal parameters are also a very important parameter in health monitoring.

[0003] Modal parameters are a description of inherent characteristics of a vibration system in a frequency domain, and generally refer to inherent frequency, damping ratio, mode shape, and modal mass of the system. In modal test, a response signal is obtained by measuring the system under a given excitation, and then a modal parameter identification method is applied to obtain the modal parameters of the system. Through gradual change of the parameters, a fault can be predicted in advance to prevent a major safety accident.

[0004] Test modal analysis needs excitation. Generally, field test is difficult to implement, and is mostly performed in a laboratory. When test modal analysis is tested in the laboratory, a method of artificial knocking is frequently used to obtain force signals, acceleration signals, frequency response, and coherent signal curves. Artificial errors are easily generated, and when excitation in different directions of the same horizontal plane is required, it is difficult to ensure that the excitation force acts on the same horizontal plane. Therefore, it is necessary to build a pile column component modal test excitation system which can meet the requirements of controllable excitation force excitation in different directions at the same height or different heights of pile column components with different diameters. SUMMARY

[0005] The present application aims to provide a pile column component modal test excitation system which has high automation degree, saves time and effort, and improves excitation precision and efficiency.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: a pile column component modal test excitation system, comprising a bearing frame, a ring walking vehicle, an excitation device, and a lifting driving mechanism; the bearing frame is provided with a ring track, the bearing frame and the ring track are sleeved outside the circumference of a pile column component, the excitation device is carried on the ring walking vehicle, the ring walking vehicle is installed on the ring track, so as to drive the excitation device to move along the outside of the circumference of the pile column component through the ring walking vehicle; the working end of the excitation device faces the pile column component to apply excitation to the pile column component; the bearing frame is installed on the lifting driving mechanism, so as to drive the bearing frame, the ring walking vehicle, and the excitation device thereon to lift through the lifting driving mechanism.

[0007] Further, the bearing frame is composed of two symmetrical left and right structural members, the ring track is composed of two symmetrical left and right half tracks, the left and right structural members are connected with the left and right half tracks through connecting frames, and one end of the left and right structural members is hinged to realize the opening and closing of the bearing frame and the ring track and to be sleeved on the pile column member; the other end of the left and right structural members is locked by a lock buckle to splice the left and right half tracks into a continuous ring track.

[0008] Further, the ring track is composed of one driving wheel track and two guide bearing tracks connected to the inner and outer sides of the driving wheel track, the driving wheel and the two guide bearing wheels walk on the corresponding driving wheel track and guide bearing track respectively.

[0009] One end of the driving gear is rotationally connected with the walking vehicle shell, the platform driving motor is installed on the walking vehicle shell, and the output end of the platform driving motor is rotationally connected with the other end of the driving gear to drive the driving gear to rotate; the excitation device has a rack at the lower part matched with the driving gear to change the distance between the excitation device and the pile column member under the driving of the driving gear.

[0010] Further, the ring track is composed of one driving wheel track and two guide bearing tracks connected to the inner and outer sides of the driving wheel track, the driving wheel and the two guide bearing wheels walk on the corresponding driving wheel track and guide bearing track respectively.

[0011] Further, the excitation device includes a force hammer device, a gas supply system and a force hammer platform; the force hammer device is fixedly installed on the force hammer platform; the force hammer platform is provided with a rack at the lower part matched with the driving gear on the ring walking vehicle along the radial direction of the pile column member to move the force hammer platform back and forth along the radial direction of the pile column member under the driving of the driving gear, thereby adjusting the distance between the excitation device and the pile column member; the gas supply system is composed of a high-pressure gas source unit, a solenoid valve and a gas supply pipeline; the high-pressure gas source unit is placed on the ground or the base frame; the high-pressure gas source unit is connected with the air inlet of the solenoid valve through the gas supply pipeline; the air outlet of the solenoid valve is connected with the air inlet of the force hammer device to supply gas for the force hammer device.

[0012] Further, the force hammer platform is provided with a position sensor at the front end to detect the distance between the force hammer platform and the pile column member, so that the force hammer platform can always maintain a certain distance from the pile column member.

[0013] Further, the force hammer device comprises a cylinder, a limiting block, a piston, a connecting rod, a return spring and a force hammer, the air inlet end of the cylinder is connected with an electromagnetic valve, the limiting block is arranged in the cylinder, the piston is arranged at the front side of the limiting block, the piston is connected with the force hammer through the connecting rod, the return spring is arranged between the front end surface of the piston and the rear end surface of the front side of the cylinder, and the front side of the cylinder is provided with a pressure relief port; when the electromagnetic valve is electrified, the valve is opened, high-pressure gas is sent into the cylinder, the high-pressure gas entering the cylinder pushes the piston, the piston compresses the return spring and pushes the force hammer out, the pile column type component is excited, when the piston passes through the pressure relief port, the high-pressure gas is discharged, the valve of the electromagnetic valve is closed, and the return spring pushes the piston back to the position of the limiting block, and the next inflation impact is waited.

[0014] Further, the lifting driving mechanism comprises a hydraulic oil pump and a hydraulic tappet, the hydraulic oil pump is connected with the hydraulic tappet to supply oil for the hydraulic tappet, and the upper end of the hydraulic tappet is fixedly connected with the bearing frame to drive the bearing frame to lift.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] 1. The present application can effectively excite different pile column type components with constant excitation force, so that the modal test can obtain signal curves under stable excitation force.

[0017] 2. The present application can realize automatic excitation of different directions on the same horizontal plane of the same pile column type structure at different heights, reduce the error of manual excitation, greatly shorten the excitation processing time, and is especially suitable for large quantities of modal tests requiring excitation in a laboratory. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a system structure top view of an embodiment of the present application;

[0019] Figure 2 is a structure front view of the ring walking vehicle and the excitation device in the embodiment of the present application;

[0020] Figure 3 is a structure side view of the ring walking vehicle and the excitation device in the embodiment of the present application;

[0021] Figure 4 is a system working state schematic view of the embodiment of the present application.

[0022] Figure: 1 - to be excited pile column member; 2 - bearing frame; 3 - hinge; 4 - locking buckle; 5 - hydraulic jib connector; 6 - connecting frame; 7 - guide load-bearing rail; 8 - drive wheel rail; 9 - guide rail and drive wheel rail welding; 10 - electromagnetic valve; 11 - pressure relief port; 12 - force hammer; 13 - cylinder; 14 - rack; 15 - bolt; 16 - limit block; 17 - return spring; 18 - position sensor; 19 - force hammer platform; 20 - guide load-bearing wheel; 21 - drive wheel; 22 - walking drive motor; 23 - transmission mechanism; 24 - horizontal axle; 25 - support frame; 26 - platform drive motor; 27 - drive gear; 28 - walking vehicle shell; 29 - hydraulic oil pump; 30 - hydraulic jib; 31 - high-pressure gas source unit; 32 - gas supply pipeline; 33 - force hammer device; 34 - ring walking vehicle; 35 - piston; 36 - connecting rod. DETAILED DESCRIPTION

[0023] The application will be further described below in conjunction with the drawings and examples.

[0024] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0025] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments consistent with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0026] As Figures 1-4As shown, the embodiment provides a pile column component modal test excitation system, which comprises a bearing frame 2, a ring walking vehicle 34, an excitation device and a lifting driving mechanism. The bearing frame 2 is provided with a ring track, the bearing frame 2 and the ring track are sleeved outside the circumference of the pile column component 1, the excitation device is carried on the ring walking vehicle 34, the ring walking vehicle 34 is installed on the ring track, so as to drive the excitation device to move along the outside of the circumference of the pile column component through the ring walking vehicle, and the working end of the excitation device faces the pile column component to excite the pile column component. Through the cooperation of the bearing frame 2, the ring walking vehicle 34 and the excitation device, multi-directional automatic excitation of the pile column component on the same horizontal plane is realized. The bearing frame 2 is installed on the lifting driving mechanism, so as to drive the bearing frame and the ring walking vehicle and the excitation device thereon to lift through the lifting driving mechanism, so as to automatically jack up the excitation device from the area that has been excited to the unexcited area, and realize multi-directional automatic excitation of the pile column component at different heights.

[0027] In the embodiment, the bearing frame 2 is composed of two symmetrical left and right structural members (which can be made of channel steel), and the ring track is composed of two symmetrical left and right half tracks. The left and right structural members are connected with the left and right half tracks through connecting frames 6 (thin steel pipes are used in the embodiment), and one end of each of the left and right structural members is hinged through a hinge 3 to realize the opening and closing of the bearing frame and the ring track and the sleeving of the bearing frame and the ring track on the pile column component. The other end of each of the left and right structural members is locked through a locking buckle 4 to splice the left and right half tracks into a continuous ring track. The left and right half tracks can be composed of multiple arc tracks by welding. Before the operation, the locking buckle 4 of the bearing frame 2 is opened, the bearing frame 2 is opened around the hinge 3, the bearing frame 2 is pushed close to the pile column component to be excited, after the pile column component to be excited is completely placed in the center of the bearing frame, the bearing frame 2 is closed and the locking buckle 4 is locked, and the closing of the bearing frame 2 is completed. At this time, the bearing frame can provide a stable walking platform for the subsequent working system.

[0028] In the embodiment, the ring walking vehicle 34 comprises a walking vehicle shell 28 (a metal shell is used in the embodiment), a platform driving motor 26 (a step motor is used in the embodiment), a driving gear 27, a walking driving motor 22, a driving wheel 21 and two guide load wheels 20. The two guide load wheels 20 are located on the left and right sides of the driving wheel 21 and are different in axis from the driving wheel 21. The two guide load wheels 20 are connected by a horizontal wheel shaft 24. The walking vehicle shell 28 is connected with a support frame 25 (a triangular fork-shaped support frame formed by thin steel pipes is used in the embodiment) at the lower part. The lower end of the support frame 25 is rotationally connected with the horizontal wheel shaft 24 and the driving wheel 21. The walking driving motor 22 is installed on the support frame 25 and its output end is connected with the driving wheel 21 through a transmission mechanism 23 (a transmission belt or the like can be used) to drive the driving wheel 21 to rotate, thereby driving the driving wheel 21 and the two guide load wheels 20 to walk on the ring track.

[0029] One end of the driving gear 27 is rotationally connected with the walking vehicle shell 28. The platform driving motor 26 is installed on the walking vehicle shell 28 and its output end is rotationally connected with the other end of the driving gear 27 to drive the driving gear to rotate. The vibration excitation device is provided with a rack 14 at the lower part to cooperate with the driving gear 27, so that the distance between the vibration excitation device and the pile column member is changed under the driving of the driving gear.

[0030] In the embodiment, the ring track is composed of one driving wheel track 8 and two guide load tracks 7 connected to the inner and outer sides of the driving wheel track 8. The driving wheel track 8 and the guide load track 7 can be connected together by welding. The driving wheel 21 and the two guide load wheels 20 walk on the corresponding driving wheel track 8 and guide load track 7 respectively.

[0031] In the embodiment, the vibration excitation device comprises a force hammer device 33, a gas supply system and a force hammer platform 19. The force hammer device 33 is fixedly installed on the force hammer platform 19. The force hammer platform 19 is provided with the rack 14 at the lower part along the radial direction of the pile column member to cooperate with the driving gear 27 on the ring walking vehicle, so that the force hammer platform 19 moves back and forth along the radial direction of the pile column member under the driving of the driving gear, thereby adjusting the distance between the vibration excitation device and the pile column member. The force hammer platform 19 is provided with a position sensor 18 at the front end. When facing pile column members with different diameters, the distance between the force hammer platform and the pile column member can be detected by the position sensor 18, thereby controlling the platform driving motor 26 to work, so that the force hammer platform can always keep a certain distance from the pile column members with different diameters.

[0032] The gas supply system is composed of a high-pressure gas source unit 31 (in this embodiment, a high-pressure gas cylinder), an electromagnetic valve 10 and a gas supply pipeline 32. The high-pressure gas source unit 31 is placed on the ground or a base frame, and is connected to the gas inlet of the electromagnetic valve 10 through the gas supply pipeline 32. The gas outlet of the electromagnetic valve 10 is connected to the gas inlet end of the force hammer device 33 to supply gas to the force hammer device. When the pneumatic excitation system is needed, the gas in the high-pressure gas source unit 31 enters the gas inlet of the electromagnetic valve 10 through the gas supply pipeline 32. The opening degree of the electromagnetic valve is controlled to control the amount of compressed air entering the cylinder to generate different propulsion forces of different energy, thereby realizing the excitation of the controllable excitation force.

[0033] In this embodiment, the force hammer device 33 includes a cylinder 13, a limiting block 16, a piston 35, a connecting rod 36, a return spring 17 and a force hammer 12. The gas inlet end of the cylinder 13 is connected to the electromagnetic valve 10. The limiting block 16 is arranged in the cylinder 13. The piston 35 is arranged on the front side of the limiting block 16. The piston 35 is connected to the force hammer 12 through the connecting rod 36. The return spring 17 is arranged between the front end surface of the piston 35 and the rear end surface of the front side of the cylinder 13. The front side of the cylinder 13 is provided with a pressure relief port 11. When the electromagnetic valve is powered on, the valve is opened, and high-pressure gas is sent into the cylinder. The high-pressure gas entering the cylinder pushes the piston. The piston compresses the return spring and pushes the force hammer out to excite the pile column member. When the piston passes the pressure relief port, the high-pressure gas is discharged, the valve of the electromagnetic valve is closed, and at the same time, the return spring pushes the piston back to the position of the limiting block, waiting for the next inflation impact.

[0034] In this embodiment, the lifting driving mechanism includes a hydraulic oil pump 29 and a hydraulic tappet 30. The hydraulic oil pump 29 is connected to the hydraulic tappet 30 to supply oil. The upper end of the hydraulic tappet 30 is fixedly connected to the bearing frame 2 through the hydraulic tappet connecting piece 5 to drive the bearing frame 2 to lift.

[0035] After the excitation device of the pile column member modal test excitation system is adjusted to maintain a certain distance from the pile column member to be excited, the driving wheel is started, and the excitation device and the gas supply system carried on the ring-shaped walking vehicle start to work at the same time. After the excitation operation in this area is completed, the ring-shaped walking vehicle and the excitation device and the gas supply system carried thereon stop working. After the lifting driving mechanism completes the reinforcement in the current area, it starts to work to lift the bearing frame, the ring-shaped walking vehicle and the excitation device to the unexcited area adjacent to the last excitation area. The above process is sequentially executed until the excitation operation in the current member to be excited area is completed. After the excitation operation in the current member to be excited is completed, the lifting driving mechanism lowers the excitation device. At this time, the bearing frame locking buckle is opened, the bearing frame is opened, and the next member to be excited is moved to repeat the above excitation process.

[0036] The working process of the pile component modal test excitation system provided by the present application is described in further detail below.

[0037] After the pile component modal test excitation system is installed, the locking buckle 4 of the bearing frame 2 is opened, the bearing frame 2 is opened around the hinge 3, and the entire device is moved so that the pile component to be excited 1 is located at the central position of the bearing frame 2. After centering is completed, the bearing frame 2 is closed around the hinge 3, and the locking buckle 4 is locked.

[0038] After the bearing frame is closed and locked, the guide load wheel 20 of the ring walking vehicle 34 is placed in the guide load rail 7, the drive wheel 21 is placed in the drive wheel rail 8, the outlet of the electromagnetic valve 10 is connected with the air cylinder 13, the inlet of the electromagnetic valve 10 is connected with the gas supply pipeline 32, the other end of the gas supply pipeline 32 is connected with the outlet of the high-pressure gas bottle 31, and the position sensor 18 at the front end of the force hammer platform 19 is started. The distance physical quantity between the force hammer platform 19 and the pile component to be excited 1 measured by the position sensor 18 is converted into the rotation of the computer-driven platform drive motor 26, and the clockwise / counterclockwise rotation of the gear 27 drives the bottom rack 14 of the force hammer platform 19 to make the entire force hammer platform 19 move forward and backward, so that the entire excitation device and the pile component to be excited 1 always maintain a certain distance.

[0039] The high-pressure gas bottle 31 is opened to allow high-pressure gas to enter the electromagnetic valve 10 through the gas supply pipeline 32. The electromagnetic valve is opened (according to different modal test requirements, the flow of the electromagnetic valve 10 can be adjusted to control the flow of high-pressure gas entering the air cylinder 13, so as to achieve different sizes of excitation force excitation). At this time, the high-pressure gas enters the air cylinder 13 of the force hammer device 33 through the electromagnetic valve, the high-pressure gas entering the air cylinder 13 pushes the piston 35, the piston 35 compresses the return spring 17, and at the same time pushes the connecting rod 36 and the force hammer 12 to generate a first excitation by forward impact.

[0040] After the excitation is generated, the piston 35 passes through the pressure relief port 11, and the high-pressure gas is discharged at the same time. The return spring 17 pushes the piston 35 back to the position of the limit block 16, and the electromagnetic valve is closed to wait for the next impact.

[0041] When different direction excitations are needed on the same height level, the walking drive motor 22 is started to drive the drive wheel 21 to move through the transmission mechanism 23. The friction between the drive wheel 21 and the drive wheel rail 8 will drive the ring walking vehicle 34 to move in a ring shape.

[0042] The guide load wheel 20 walks in the guide load rail 7 welded on both sides of the driving wheel rail 8 to maintain the support and guide function required by the normal walking of the ring walking vehicle 34. The system for realizing the ring walking of the excitation device in the pile member modal test excitation system is composed of the driving wheel rail 8 welded between the driving wheel rails 8 made of annular channel steel, the guide load rail 7 made of annular channel steel, and the driving wheel 21 and the guide load wheel 20. The guide load rail 7 is welded with the bearing frame 2 through the thin steel pipe 6, and the two guide load wheels 20 are connected together through the horizontal wheel shaft 24 to provide guidance and support for the trolley. The driving wheel rail is arranged at the middle position of the two driving wheel rails 8, and the driving wheel is arranged on the walking trolley and driven by the motor.

[0043] When the trolley reaches the target excitation direction position, the walking driving motor 22 can be turned off to stop the ring walking of the ring walking vehicle 34, and after the position sensor 18 re-calibrates the distance between the pile member 1 to be excited and the force hammer platform 19, the operation in the first excitation can be repeated to generate excitation in different directions on the same height horizontal plane.

[0044] After the excitation in different directions at the height is completed, the hydraulic oil pump 29 cooperates with the hydraulic jack 30 to lift the bearing frame as a whole to the next section, and all the above operations are repeated until the excitation operation of all nodes of the pile member is completed. The hydraulic jack is connected with the excitation device through the hydraulic jack connector 5.

[0045] After the single pile member is excited, the hydraulic oil pump 29 cooperates with the hydraulic jack 30 to lower the bearing frame, the locking buckle 4 is opened, and the bearing frame is opened around the hinge 3. The above operations are repeated until all the excitation work of the test is completed.

[0046] The above is only the preferred embodiment of the present application, and is not intended to limit the present application in other forms. Any skilled person in the art can modify or change the above disclosed technical content to equivalent embodiments. However, any simple modification, equivalent change and modification of the above embodiments without departing from the technical solution of the present application, and according to the technical essence of the present application, still belong to the protection scope of the present application.

Claims

1. A pile member modal test excitation system, characterized by, The utility model provides a kind of pile column type component vibration excitation device, including bearing frame, annular walking car, vibration excitation device and lifting drive mechanism;The bearing frame is equipped with annular track, the bearing frame and annular track are set on the circumference outside of pile column type component, the vibration excitation device is carried on annular walking car, annular walking car is installed on annular track, to drive vibration excitation device along the circumference outside of pile column type component by annular walking car;The working end of vibration excitation device is towards pile column type component to exert vibration excitation on pile column type component;The bearing frame is installed on lifting drive mechanism, to drive bearing frame and its annular walking car, vibration excitation device on lifting drive mechanism by lifting drive mechanism; The annular walking car includes walking car shell, platform drive motor, drive gear, walking drive motor, drive wheel and two guide heavy wheels. The vibration excitation device includes force hammer device, gas supply system and force hammer platform;The force hammer device is fixedly installed on the force hammer platform;The lower part of the force hammer platform is provided with a rack that cooperates with the drive gear on the annular walking car along the radial direction of the pile column type component, so that the force hammer platform moves back and forth along the radial direction of the pile column type component under the drive of the drive gear, thereby adjusting the distance between the vibration excitation device and the pile column type component;The gas supply system is composed of a high-pressure gas source unit, a solenoid valve and a gas supply pipeline, the high-pressure gas source unit is placed on the ground or a base frame, the high-pressure gas source unit is connected to the air inlet of the solenoid valve through the gas supply pipeline, and the air outlet of the solenoid valve is connected to the air inlet of the force hammer device to supply gas to the force hammer device;The force hammer device includes a cylinder, a limiting block, a piston, a connecting rod, a return spring and a force hammer.

2. The pile member modal test excitation system according to claim 1, characterized by, The bearing frame is composed of two symmetrical left and right structural members, the annular track is composed of two symmetrical left and right half tracks, the left and right structural members are connected to the left and right half tracks through connecting frames respectively, one end of each left and right structural member is hingedly connected through a hinge to realize the opening and closing of the bearing frame and the annular track and to set them on the pile column type component, and the other end of each left and right structural member is locked by a locking buckle to splice the left and right half tracks into a continuous annular track.

3. The pile member modal test excitation system according to claim 1, wherein The two guide heavy wheels are located on the left and right sides of the drive wheel and are not coaxial with the drive wheel, the two guide heavy wheels are connected by a horizontal wheel shaft, the walking car shell is connected with a support frame at the lower part, the lower end of the support frame is rotationally connected with the horizontal wheel shaft and the drive wheel, the walking drive motor is installed on the support frame, and the output end thereof is connected with the drive wheel through a transmission mechanism to drive the drive wheel to rotate, thereby driving the drive wheel and the two guide heavy wheels to walk on the annular track. One end of the drive gear is rotationally connected with the walking car shell, the platform drive motor is installed on the walking car shell, and the output end thereof is rotationally connected with the other end of the drive gear to drive the drive gear to rotate. The lower part of the vibration excitation device has a rack that cooperates with the drive gear to change the distance between the vibration excitation device and the pile column type component under the drive of the drive gear.

4. The pile member modal test excitation system according to claim 3, wherein The annular track is composed of one drive wheel track and two guide heavy tracks connected to the inner and outer sides thereof, and the drive wheel and the two guide heavy wheels walk on the corresponding drive wheel track and guide heavy tracks respectively.

5. The pile member modal test excitation system of claim 1, wherein The position sensor is arranged at the front end of the force hammer platform to detect the distance between the force hammer platform and the pile column type component, so that the force hammer platform can keep a certain distance from the pile column type component.

6. The pile member modal test excitation system of claim 1, wherein The air inlet end of the cylinder is connected with the electromagnetic valve, the cylinder is provided with a limiting block, the piston is arranged at the front side of the limiting block, the piston is connected with the force hammer through a connecting rod, the reset spring is arranged between the front end surface of the piston and the rear end surface of the front side of the cylinder, and the front side of the cylinder is provided with a pressure relief port; when the electromagnetic valve is powered on, the valve is opened, high-pressure gas is sent into the cylinder, the high-pressure gas entering the cylinder pushes the piston, the piston compresses the reset spring and pushes the force hammer out to excite the pile column type component; when the piston passes the pressure relief port, the high-pressure gas is discharged, the valve of the electromagnetic valve is closed, and the reset spring pushes the piston back to the position of the limiting block for the next inflation impact.

7. The pile member modal test excitation system of claim 1, wherein The lifting driving mechanism comprises a hydraulic oil pump and a hydraulic tappet, the hydraulic oil pump is connected with the hydraulic tappet to supply oil for the hydraulic tappet, and the upper end of the hydraulic tappet is fixedly connected with the bearing frame to drive the bearing frame to lift.

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