Simulated vibration test platform based on underwater pile hammer power station

Abstract

The invention discloses a simulation vibration test platform based on an underwater pile hammer power station, and relates to the technical field of vibration testing, the simulation vibration test platform comprises a base, a power assembly, a vibration assembly, a damping and amplitude adjusting assembly and a rotation limiting assembly, the power assembly is arranged between the vibration assembly and the base, and the rotation limiting assembly is arranged between the vibration assembly and the base. The power assembly pushes the vibration assembly to move upwards, the vibration assembly is arranged at the top of the base and can carry the underwater power station to do free falling motion, the damping and amplitude adjusting assembly is arranged at the top of the base, and the damping and amplitude adjusting assembly limits and adjusts the distance of free falling. The damping and amplitude adjusting assembly simulates the primary damping effect of the underwater pile hammer, the rotation limiting assembly is arranged between the vibration assembly and the base, and the rotation limiting assembly is used for limiting relative rotation between the vibration assembly and the base. The device is installed.

Description

Technical Field

[0001] The invention relates to the technical field of vibration testing, in particular to a simulation vibration test platform based on an underwater pile hammer power station. Background Art

[0002] With the gradual development of deep-sea underwater projects such as deep-sea underwater oil and gas development, floating offshore wind power, and deep-sea bridge construction, there is huge room for the growth of underwater hydraulic pile hammers. An underwater power station used in conjunction with the underwater hydraulic pile hammer is indispensable. Since the underwater hydraulic pile hammer is an impact device, the underwater power station mounted on the periphery of the underwater hydraulic pile hammer is subject to strong vibrations. Simply increasing the structural strength of the underwater power station cannot solve the vibration problems of other hydraulic oil circuits and electrical components caused by the vibration. It is necessary to set up an underwater power station buffer system to solve the vibration problem.

[0003] The existing defects are: 1. Patent document CN113670641A discloses a hydraulic pile hammer underwater test platform, "including a foundation pit, a spring damping isolator and a water retaining plate, the bottom wall of the foundation pit is equipped with multiple groups of spring damping isolators arranged evenly, the outer wall of the spring damping isolator is equipped with a water retaining plate, the top of the spring damping isolator is equipped with a platform base; the top of the platform base is equipped with a height adjustment structure, the height adjustment structure is composed of a round table, an expansion plate, an electric telescopic rod, an outer cover tube and an annular protrusion, the bottom of the round table and the top of the platform base are connected The invention can be changed in height when in use, which makes it easy to test different height specifications of hydraulic pile hammers through the device. The installation between the test pile and the platform base can disperse the force through the grid rib plate. At the same time, the spring damping isolator in the device is wrapped with a waterproof cover cloth, which can be used for water isolation and rust prevention. The connection between the section tube and the surrounding tube in the device is surrounded by a circular rib plate to reduce deformation. However, it is impossible to simulate the penetration and striking frequency of the pile during pile driving, and it is impossible to verify the performance of the underwater power station buffer mechanism under different penetration and striking frequencies. 2. Patent document CN118520710B discloses an underwater pile hammer impact model and energy transfer calculation method, "including decomposing the underwater pile hammer impact process into hammer core impact, anvil impact and rebound, expressing the contact stiffness between the hammer core and anvil, anvil and steel pile as a massless spring, expressing the elasticity between the steel pile and the pile end soil as a massless spring, and expressing the blockage between the steel pile and the pile end soil as a damper. The calculation method includes dimensionless acceleration and mass, calculating the dimensionless displacement response and impact load of the pile top, and analyzing the energy transfer efficiency. The present invention analyzes the dynamic response of the impact system with a more universal and efficient solution method, discusses the influence of some parameters on the variation law of the dimensionless load on the pile top, the law of the anvil absorbing and transferring energy, and the law of the pile top absorbing energy, and lays the foundation for the subsequent research on energy transfer and parameter research of the pile impact system", but it is impossible to simulate the penetration and striking frequency of the pile during pile driving, and it is impossible to verify the performance of the underwater power station buffer mechanism under different penetrations and striking frequencies; 3. Patent document CN202881948U discloses a pressurized underwater hydraulic pile hammer, "including a hydraulic power system, a striking system, a pile cap system, and a cylindrical cylinder. The cylindrical cylinder includes an upper cylinder, an intermediate cylinder, and a lower cylinder. The upper cylinder contains an upper air chamber, the upper top of the upper cylinder is closed, and the intermediate cylinder contains an intermediate air chamber. The pile cap system includes a pile cap, a replacement hammer is arranged in the pile cap, a certain amount of water is arranged in the replacement hammer, and the water level in the pile cap is controlled by the air pressure of the lower air chamber. The water surface and the lower cylinder and the pile cap of the pile cap system form a lower air chamber, and the water surface and the pile cap of the pile cap system form a lower air chamber. There is a spacing between the lower end faces of the pile cap, the three air chambers are arranged on the same axis, the hydraulic power system is arranged in the upper air chamber, the striking system is arranged in the middle air chamber and the lower air chamber, a first partition is arranged between the upper air chamber and the middle air chamber, and a second partition is arranged between the middle air chamber and the lower air chamber. The pile hammer arranged above has a closed space and is suitable for underwater pile driving. However, it is impossible to simulate the penetration and striking frequency of the pile during pile driving, and it is impossible to verify the performance of the underwater power station buffer mechanism under different penetration and striking frequencies. 4. Patent document CN109914410B discloses a hydraulic pile driving underwater pile driving equipment and its control method, "including hydraulic pile driving underwater pile driving equipment, pile hammer mechanism, water level inspection and air pressure control box, the hydraulic pile driving underwater pile driving equipment is provided with a hammer body, a hammer cap and a hammer replacement, a water level detection sensor, a counterweight, a hammer top air supply pipe, a hammer top air supply pipe connector, a multi-way connector, a hammer cap air supply pipe, an oil inlet supply pipe, an oil supply pipe, an oil return pipe, a water level inspection and air pressure control box, a pile hammer power station, a high-pressure air compressor control system, a water level monitoring sensor, ... hammer body, a hammer cap and a hammer replacement, a water level detection sensor, a hammer cap and a hammer top air supply pipe, a hammer top air supply pipe connector, a multi-way connector, a hammer cap air supply pipe, a oil inlet supply pipe, an oil supply pipe, a oil return pipe, a water level inspection and air pressure control box, a pile hammer power station, a high-pressure air compressor control system, a water level monitoring sensor, a hammer body, a hammer cap and a hammer replacement, a water level detection sensor, a hammer body, a hammer cap and a hammer replacement, a water level detection sensor, a hammer body, a hammer cap and a hammer replacement, a water level detection sensor, a hammer cap and a hammer top air supply pipe, a hammer top air supply pipe connector, a multi-way connector, a hammer cap and a hammer top air supply pipe, a hammer top air supply pipe connector, a hammer top air supply pipe, a hammer top air supply pipe connector, a hammer top air supply pipe, a hammer top air supply pipe, a hammer top air supply pipe, The depth of the pile hammer mechanism in the water is detected at the same time. After the hydraulic pile driving underwater piling equipment is put into the water as a whole, the gas inside the pile hammer mechanism is exhausted through the exhaust pipe, so that the resistance of the hydraulic pile driving underwater piling equipment is reduced when it is performing underwater piling. The device is reasonably designed, which can effectively reduce the resistance of the device in underwater piling, reduce the energy consumed by the equipment, and increase the service life of the equipment. However, it is impossible to simulate the penetration degree and striking frequency of the pile during piling, and it is impossible to verify the performance of the buffer mechanism of the underwater power station under different penetration degrees and striking frequencies. Summary of the invention

[0004] The purpose of the present invention is to provide a simulated vibration test platform based on an underwater pile hammer power station to solve the problem that the penetration depth and striking frequency of the pile during simulated pile driving cannot be achieved in the above-mentioned background technology, and to verify the performance of the underwater power station buffer mechanism under different penetration depths and striking frequencies, so that the structural strength of the underwater power station cannot solve the technical problem of vibration of other hydraulic oil circuits and electrical components caused by vibration.

[0005] To achieve the above object, the present invention provides the following technical solutions: a simulated vibration test platform based on an underwater pile hammer power station, comprising a base, a power component, a vibration component, a shock absorption and amplitude adjustment component and a rotation limiting component; The power component is arranged between the vibration component and the base, the power component pushes the vibration component to move upward, the vibration component is arranged on the top of the base, the vibration component can carry the underwater power station to perform free fall movement, the shock absorption and amplitude adjustment component is arranged on the top of the base, the shock absorption and amplitude adjustment component limits and adjusts the distance of the free fall, the shock absorption and amplitude adjustment component simulates the first-level shock absorption effect of the underwater pile hammer, the rotation limiting component is arranged between the vibration component and the base, and the rotation limiting component is used to limit the relative rotation between the vibration component and the base.

[0006] Preferably, the power assembly includes a variable frequency motor, a reducer, a synchronous gearbox, an output shaft, a bearing seat and an involute cam. The variable frequency motor is located at the top of the base, the reducer is located at the top of the base, the flange of the variable frequency motor is connected to the flange at the input end of the reducer, and the output end of the reducer is connected to the input end flange of the synchronous gearbox through a flange. The synchronous gearbox has four output shafts, and one end of each output shaft is supported by a bearing seat. An involute cam is fixedly mounted on the inner side of the bearing seat, and an involute cam is mounted on each output shaft.

[0007] Preferably, the output shaft has a consistent rotation speed and direction, the involute cam has a consistent shape and the direction of the highest protruding point is consistent, the involute cam rotates counterclockwise, and the rotation angle of the cam involute from the starting point to the end point is 270°~275°.

[0008] Preferably, the arc radius of the starting point of the involute is Rmin, the arc radius of the ending point of the involute is Rmax, and the maximum lifting distance of the involute cam after one rotation is (Rmax-Rmin).

[0009] Preferably, the shock absorption and amplitude adjustment component includes a buffer limit cylinder seat, a buffer component, and an amplitude adjustment pad. The buffer component and the amplitude adjustment pad are assembled in the buffer limit cylinder seat. The amplitude adjustment pad is placed above the buffer component and close to the bottom of the vibration platform. The amplitude adjustment pad is a circular plate of various thicknesses. Amplitude adjustment pads of different thicknesses are selected to limit and adjust the free fall distance of the vibration platform. The free fall distance is less than or equal to (Rmax-Rmin-10 mm).

[0010] Preferably, the buffer limit cylinder seats are evenly distributed on the concentric circles of the base which are concentric with the vibration platform, and the buffer is used to simulate the primary shock absorption of the underwater pile hammer.

[0011] Preferably, the vibration assembly includes a vibration platform, a guide cylinder, a roller seat, a roller shaft, and a roller. The vibration platform is sleeved on the outer cylindrical surface of the guide cylinder, a roller seat is arranged below the vibration platform, a roller shaft is installed through the outer wall of the roller seat, and a roller is installed on the outer wall of the roller shaft. The vibration platform supports an involute cam through the roller arranged below. After the involute cam rotates counterclockwise from the starting point A of the involute to the end point of the involute and leaves the end point B, the vibration platform falls freely on the top of the evenly distributed amplitude adjustment pad.

[0012] Preferably, the rotation limiting assembly includes a buffer limit cylinder seat and a limit sleeve, the buffer limit cylinder seat is connected to the top of the base, the limit sleeve is connected to the bottom of the vibration platform, the limit sleeve is sleeved on the outer circle of the buffer limit cylinder seat, and the overlapping length of the inner hole of the limit sleeve and the outer circle of the buffer limit cylinder seat is greater than the maximum amplitude of this test platform.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention controls the working frequency of the vibration platform by installing a variable frequency motor to drive a reduction box with a certain speed ratio, the reduction box drives the synchronous gear box, the driving gear inside the synchronous gear box drives two driven gears with the same number of teeth, so that the speed and direction of the two driven gears are the same, the driven gear drives the two output shafts of the synchronous gear box to rotate, and the output shaft drives the involute cam to rotate at the same speed and direction, and utilizes the mutation characteristics of the involute cam. After leaving the highest point of the involute cam, the vibration platform performs free fall motion, and the amplitude of the vibration platform is controlled by changing the thickness of the amplitude adjustment pad, thereby simulating the different penetration degrees of piles during the piling process, and verifying the influence of the vibration of the piles under different penetration degrees on the underwater power station. The power component adjusts the speed of the variable frequency motor to adjust the number of revolutions per minute of the involute cam, thereby simulating the vibration frequency of the underwater power station during the piling process, and verifying the service life of the buffer components of the underwater power station under different vibration frequencies. Ultimately, the penetration depth and striking frequency of the pile during pile driving are simulated, and the performance of the buffer mechanism of the underwater power station under different penetration depths and striking frequencies is verified. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 It is a schematic diagram of the top view of the structure of the present invention; Figure 3 It is a schematic diagram of the roller seat structure of the present invention; Figure 4 It is a schematic diagram of the motion trajectory of the involute cam of the present invention; Figure 5 It is a schematic diagram of the structure of the buffer member of the present invention.

[0015] In the figure: 1. base; 2. vibration platform; 3. guide cylinder; 4. amplitude adjustment pad; 5. buffer limit cylinder seat; 6. buffer part; 7. bearing seat; 8. involute cam; 9. frequency conversion motor; 10. output shaft; 11. reducer; 12. gear box; 13. limit sleeve; 14. roller seat; 15. roller shaft; 16. roller. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, it can be understood according to the specific situation.

[0019] Example 1: Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , an embodiment provided by the present invention: a simulated vibration test platform of an underwater pile hammer power station, comprising a base, a power component, a vibration component, a shock absorption and amplitude adjustment component, and a rotation limiting component; The power assembly includes: a bearing seat 7, a variable frequency motor 9, an output shaft 10, a reducer 11, a synchronous gear box 12 and an involute cam 8; The flange of the variable frequency motor 9 is connected to the flange of the input end of the reducer 11, and the output end of the reducer 11 is connected to the flange of the input end of the synchronous gearbox 12 through a flange. The synchronous gearbox 12 extends four output shafts 10, each shaft end is supported by a bearing seat 7, and four involute cams 8 are fixedly connected to the shaft ends of the four output shafts 10 respectively; The involute cam 8 rotates to the bottom dead point A and the top dead point B. The rotation direction of the involute cam 8 is counterclockwise. The bottom dead point A of the involute cam 8 is the starting point of the involute. When the involute cam 8 rotates 270° counterclockwise, the top dead point B of the involute cam 8 is the ending point of the involute. Due to the sudden drop of the involute cam 8, when the involute cam 8 reaches the top dead point B and continues to rotate counterclockwise, the roller 16 of the vibration assembly will lose the support of the involute cam 8, and the vibration assembly will fall instantly and perform free fall motion. By changing the output speed of the variable frequency motor 9 and decelerating it through the reducer 11, the output shaft 10 and the speed of the involute cam 8 fixed on the output shaft 10 can be adjusted, the vibration frequency of the vibration platform 2 can be adjusted, the service life of the buffer components of the underwater power station at different vibration frequencies can be verified, and the reliability of the shock absorber on the underwater power station can be tested; The vibration assembly includes a vibration platform 2, a guide cylinder 3, a roller seat 14, a roller shaft 15, and a roller 16. The vibration platform 2 is sleeved on the outer circle of the guide cylinder 3. The vibration platform 2 slides up and down along the outer circle of the guide cylinder 3, and after falling, it is seated on a plurality of evenly distributed limit damping and amplitude adjustment assemblies. The amplitude adjustment pad 4, the buffer limit cylinder seat 5 and the buffer member 6, the buffer limit cylinder seat 5 is installed on the base 1, the buffer member 6 is an elastic body, which is installed in the buffer limit cylinder seat 5, the amplitude adjustment pad 4 is placed in the buffer limit cylinder seat 5, the top of the buffer member 6 is close to the bottom of the vibration platform 2, and the vibration distance of the vibration platform 2 can be adjusted by changing the thickness of the amplitude adjustment pad 4, so as to achieve adjustable amplitude, which is closer to the actual working condition of piling. The frequency conversion motor drives a reduction box with a certain speed ratio to control the working frequency of the vibration platform 2, and the reduction box drives the synchronous gear box. The driving gear inside the synchronous gear box drives two driven gears with the same number of teeth, so that the speed and direction of the two driven gears are the same, and the driven gear belt The two output shafts of the dynamic synchronous gearbox rotate, and the output shaft drives the involute cam to rotate at the same speed and direction. By using the mutation characteristics of the involute cam, after leaving the highest point of the involute cam, the vibration platform 2 performs free fall motion. By changing the thickness of the amplitude adjustment pad 4, the vibration amplitude of the vibration platform 2 is controlled, thereby simulating the different penetrations of the piles during the piling process, and verifying the impact of the vibration of the piles under different penetrations on the underwater power station. The power component adjusts the speed of the variable frequency motor to adjust the number of revolutions of the involute cam per minute, thereby simulating the vibration frequency of the underwater power station during the piling process, and verifying the service life of the buffer components of the underwater power station under different vibration frequencies. Finally, the penetration and striking frequency of the piles during the piling process are simulated, and the performance of the underwater power station buffer mechanism under different penetrations and striking frequencies is verified.

[0020] Example 2: Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , an embodiment provided by the present invention: a simulated vibration test platform based on an underwater pile hammer power station, comprising a base 1, a power component, a vibration component, a shock absorption and amplitude adjustment component and a rotation limiting component; The power component is arranged between the vibration component and the base 1, and the power component pushes the vibration component to move upward. The vibration component is arranged on the top of the base 1, and the vibration component can carry the underwater power station to perform free fall movement. The shock absorption and amplitude adjustment component is arranged on the top of the base 1, and the shock absorption and amplitude adjustment component limits and adjusts the distance of the free fall. The shock absorption and amplitude adjustment component simulates the effect of the first-level shock absorption of the underwater pile hammer. The rotation limiting component is arranged between the vibration component and the base 1, and the rotation limiting component is used to limit the relative rotation between the vibration component and the base 1. The power component includes a variable frequency motor 9, a reducer 11, a synchronous gear box 12, an output shaft 10, a bearing seat 7 and an involute cam 8. The variable frequency motor 9 is located at the top of the base 1. The reducer 11 is located at the top of the base 1, the flange of the variable frequency motor 9 is connected to the flange of the input end of the reducer 11, and the output end of the reducer 11 is connected to the input end flange of the synchronous gear box 12 through the flange. The synchronous gear box 12 has four output shafts 10, and one end of each output shaft 10 is supported by a bearing seat 7. An involute cam 8 is fixedly installed on the inner side of the bearing seat 7. An involute cam 8 is installed on each output shaft 10. The output shafts 10 have the same speed and direction. The involute cams 8 have the same shape and the direction of the highest protruding point. The involute cam 8 rotates counterclockwise. The rotation angle of the cam involute from the starting point to the end point is 270°, and the arc radius of the starting point of the involute is Rmin.The arc radius of the end point of the involute is Rmax, and the maximum lifting distance of the involute cam 8 after one rotation is Rmax-Rmin. The damping and amplitude adjustment assembly includes a buffer limit cylinder seat 5, a buffer 6, and an amplitude adjustment pad 4. The buffer 6 and the amplitude adjustment pad 4 are assembled in the buffer limit cylinder seat 5. The amplitude adjustment pad 4 is placed above the buffer 6 and close to the bottom of the vibration platform 2. The amplitude adjustment pad 4 is a circular plate of various thicknesses. The amplitude adjustment pad 4 of different thicknesses is selected to limit and adjust the free fall distance of the vibration platform 2. The free fall The distance is less than or equal to Rmax-Rmin-10 mm, the buffer limit cylinder seat 5 is evenly distributed on the concentric circumference of the base 1 concentric with the vibration platform 2, and the buffer member 6 is used to simulate the primary shock absorption of the underwater pile hammer. The vibration assembly includes a vibration platform 2, a guide cylinder 3, a roller seat 14, a roller shaft 15, and a roller 16. The vibration platform 2 is sleeved on the outer circumferential surface of the guide cylinder 3. A roller seat 14 is arranged below the vibration platform 2. The outer wall of the roller seat 14 is penetrated and installed with a roller shaft 15. The outer wall of the roller shaft 15 is installed with a roller 16. The vibration platform 2 is provided below The roller 16 supports the involute cam 8. After the involute cam 8 rotates counterclockwise from the involute from the starting point A to the end point of the involute and leaves the end point B, the vibration platform 2 falls freely on the top of the evenly distributed amplitude adjustment pad 4. The rotation limit assembly includes a buffer limit cylinder seat 5 and a limit sleeve 13. The buffer limit cylinder seat 5 is connected to the top of the base 1, and the limit sleeve 13 is connected to the bottom of the vibration platform 2. The limit sleeve 13 is sleeved on the outer circle of the buffer limit cylinder seat 5. The overlapping length of the inner hole of the limit sleeve 13 and the outer circle of the buffer limit cylinder seat 5 is greater than that of the test platform. The maximum amplitude, the vibration platform 2 falls freely on the shock absorption and amplitude adjustment assembly. Since the buffer 6 is an elastic body, part of the impact energy of the vibration platform 2 falling freely is absorbed by the buffer 6, which is used to prevent the vibration platform 2 from applying the impact of the free fall to the involute cam 8, causing damage to the involute cam 8. It is also used to simulate the primary shock absorption effect of the underwater pile hammer. By replacing the thickness of the amplitude adjustment pad 4 and adjusting the distance of the free fall of the vibration platform 2, the vibration distance of the vibration platform 2 can be adjusted to simulate different penetration degrees of the pile during the pile driving process;, The buffer member 6 in the buffer limit cylinder seat 5 is made of the same elastomeric material as the first-level buffer of the underwater pile hammer. The thickness and number of layers of the elastomeric material are consistent with those of the underwater pile hammer. The total bearing area of ​​the buffer member 6 is determined by calculation according to the ratio of the free-fall weight of the hammer body of the underwater pile hammer to the total bearing area of ​​the first-level buffer of the underwater pile hammer. The calculation method is as follows: Assume: the free-fall weight of the underwater pile hammer is W1, the total bearing area of ​​the first-level buffer of the underwater pile hammer is S1, The vibration assembly includes the free-fall weight W2 of the underwater pile hammer power station to be tested and the total bearing area S2 of the buffer member 6 .

[0021]

[0022] The rotation limiting assembly includes a buffer limit cylinder seat 5 and a limit sleeve 13. The buffer limit cylinder seat 5 is connected to the base 1, and the limit sleeve 13 is connected to the bottom of the vibration platform 2. The limit sleeve 13 is sleeved on the outer circle of the buffer limit cylinder seat 5, and the overlapping length of the inner hole of the limit sleeve 13 and the outer circle of the buffer limit cylinder seat 5 is greater than the maximum amplitude of this test platform.

[0023] Working principle: the variable frequency motor drives a reduction box with a certain speed ratio to control the working frequency of the vibration platform 2, the reduction box drives the synchronous gear box, the driving gear inside the synchronous gear box drives two driven gears with the same number of teeth, so that the speed and direction of the two driven gears are the same, the driven gear drives the two output shafts of the synchronous gear box to rotate, and the output shaft drives the involute cam to rotate at the same speed and direction. By utilizing the mutation characteristics of the involute cam, when it leaves the highest point of the involute cam, the vibration platform 2 performs free fall motion, and the thickness of the amplitude adjustment pad 4 is changed to control the amplitude of the vibration of the vibration platform 2, thereby simulating the different penetration degrees of the pile during the piling process, and verifying the impact of the vibration of the pile under different penetration degrees on the underwater power station. The power component adjusts the speed of the variable frequency motor to adjust the number of revolutions of the involute cam per minute, thereby simulating the vibration frequency of the underwater power station during the piling process, and verifying the service life of the buffer components of the underwater power station under different vibration frequencies. Ultimately, the penetration depth and striking frequency of the pile during pile driving are simulated, and the performance of the buffer mechanism of the underwater power station under different penetration depths and striking frequencies is verified.

[0024] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A simulated vibration test platform based on an underwater pile hammer power station, characterized in that: It comprises a base (1), a power component, a vibration component, a shock absorption and amplitude adjustment component and a rotation limiting component; The power component is arranged between the vibration component and the base (1), the power component drives the vibration component to move upward, the vibration component is arranged on the top of the base (1), the vibration component can carry the underwater power station to perform free fall movement, the shock absorption and amplitude adjustment component is arranged on the top of the base (1), the shock absorption and amplitude adjustment component limits and adjusts the distance of the free fall, the shock absorption and amplitude adjustment component simulates the effect of the first-level shock absorption of an underwater pile hammer, and the rotation limiting component is arranged between the vibration component and the base (1), the rotation limiting component is used to limit the relative rotation between the vibration component and the base (1).

2. The simulated vibration test platform based on the underwater pile hammer power station according to claim 1 is characterized by: The power assembly comprises a variable frequency motor (9), a reducer (11), a synchronous gearbox (12), an output shaft (10), a bearing seat (7) and an involute cam (8). The variable frequency motor (9) is located at the top of the base (1), the reducer (11) is located at the top of the base (1), the flange of the variable frequency motor (9) is connected to the flange of the input end of the reducer (11), the output end of the reducer (11) is connected to the flange of the input end of the synchronous gearbox (12) via a flange, the synchronous gearbox (12) has four output shafts (10), and one end of each output shaft (10) is supported by a bearing seat (7), an involute cam (8) is fixedly mounted on the inner side of the bearing seat (7), and one involute cam (8) is mounted on each output shaft (10).

3. A simulated vibration test platform based on an underwater pile hammer power station according to claim 2, characterized in that: The output shaft (10) has a consistent rotation speed and a consistent direction, the involute cam (8) has a consistent shape and a consistent direction of the highest protruding point, the involute cam (8) rotates counterclockwise, and the rotation angle of the cam involute from the starting point to the end point is 270°-275°.

4. The simulated vibration test platform based on the underwater pile hammer power station according to claim 3 is characterized by: The arc radius of the involute starting point is Rmin, the arc radius of the involute ending point is Rmax, and the maximum lifting distance of the involute cam (8) after one rotation is (Rmax-Rmin).

5. The simulated vibration test platform based on the underwater pile hammer power station according to claim 1, characterized in that: The shock absorption and amplitude adjustment component comprises a buffer limit cylinder seat (5), a buffer member (6), and an amplitude adjustment pad (4). The buffer member (6) and the amplitude adjustment pad (4) are assembled in the buffer limit cylinder seat (5). The amplitude adjustment pad (4) is placed above the buffer member (6) and closely attached to the bottom of the vibration platform (2). The amplitude adjustment pad (4) is a circular plate of various thicknesses. The amplitude adjustment pads (4) of different thicknesses are selected to limit and adjust the free fall distance of the vibration platform (2). The free fall distance is less than or equal to (Rmax-Rmin-10) mm.

6. The simulated vibration test platform based on the underwater pile hammer power station according to claim 5, characterized in that: The buffer limit cylinder seats (5) are evenly distributed on the concentric circumference of the base (1) which is concentric with the vibration platform (2), and the buffer member (6) is used to simulate the primary shock absorption of an underwater pile hammer.

7. The simulated vibration test platform based on the underwater pile hammer power station according to claim 1, characterized in that: The vibration assembly comprises a vibration platform (2), a guide cylinder (3), a roller seat (14), a roller shaft (15), and a roller (16). The vibration platform (2) is sleeved on the outer cylindrical surface of the guide cylinder (3). A roller seat (14) is arranged below the vibration platform (2). A roller shaft (15) is installed through the outer wall of the roller seat (14). A roller (16) is installed on the outer wall of the roller shaft (15). The vibration platform (2) supports an involute cam (8) via the roller (16) arranged below. After the involute cam (8) rotates counterclockwise from the involute from the starting point (A) to the end point of the involute and leaves the end point (B), the vibration platform (2) falls freely onto the top of the evenly distributed amplitude adjustment pad (4).

8. The simulated vibration test platform based on the underwater pile hammer power station according to claim 1, characterized in that: The rotation limiting assembly comprises a buffer limit cylinder seat (5) and a limit sleeve (13), the buffer limit cylinder seat (5) is connected to the top of the base (1), the limit sleeve (13) is connected to the bottom of the vibration platform (2), the limit sleeve (13) is sleeved on the outer circle of the buffer limit cylinder seat (5), and the overlapping length of the inner hole of the limit sleeve (13) and the outer circle of the buffer limit cylinder seat (5) is greater than the maximum amplitude of the test platform.

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