A follow-up hydraulic vibration reduction device, system and method

Abstract

The present invention provides a follow-up hydraulic vibration reduction device, system and method, which relate to the field of vibration reduction equipment, and include a hydraulic cylinder, one end of which is connected to an elastic telescopic mechanism, and the other end of which is connected to a ground rail fixing block via a length adjustment mechanism, wherein the elastic telescopic mechanism includes a telescopic rod coaxially connected to the hydraulic cylinder and a spring coaxially sleeved on the telescopic rod, and the spring is correspondingly extended or shortened with the movement of the telescopic rod; the length adjustment mechanism is used to change the distance between the hydraulic cylinder and the ground rail fixing block, and the hydraulic cylinder cooperates with the elastic telescopic structure to automatically adjust the hydraulic support force according to the operating state of the equipment to be vibration reduced, thereby adjusting the frequency of the offset test system, reducing the mechanical resonance at a partial rotation speed of the equipment, and achieving protection of the equipment as a whole.

Description

Technical Field

[0001] The present disclosure relates to the field of vibration reduction equipment, and in particular to a follow-up hydraulic vibration reduction device, system and method. Background Art

[0002] The statements in this section merely provide background art related to the present disclosure and do not necessarily constitute prior art.

[0003] Structural vibration of low-speed diesel engines is a common problem for this type of diesel engine during bench testing. Running the diesel engine for a long time under excessive (beyond the standard) structural vibration conditions will cause quality accidents such as component fatigue or even damage.

[0004] The vibration of the low-speed diesel engine is directly related to the excitation force of the diesel engine, the speed of the diesel engine in various working conditions, and the installation and fixing structure of the diesel engine. Once the diesel engine model and the test bench position are determined, the vibration of the diesel engine under various working conditions is determined. The change in the connection strength between the diesel engine and the test bench base can change the natural vibration frequency of the diesel engine as a whole system. When the natural vibration frequency of the system is far away from the corresponding frequency of the actual operating condition of the diesel engine, the system vibration will be greatly improved. In general, the natural frequency of the system tends to be adjusted in the direction of increasing.

[0005] The inventor found that the current diesel engine design is generally based on the ship loading environment as input for design and calculation. After the diesel engine is loaded on the ship, the engine body and the hull are reinforced and supported, so that the natural vibration frequency of the diesel engine is affected by the hull support. The natural vibration frequency of the system is far away from the frequency corresponding to the actual operating conditions of the diesel engine, and its vibration problem basically meets the standard. However, there is no condition to install a similar support structure during the bench test and running-in of the diesel engine at the manufacturer. The diesel engine body is located on the ground rail platform, with a cushion of about 1 meter in the middle and bolted, so the resonance is obvious at some speeds; the manufacturer implements a partial reinforcement plan, which has poor versatility and cannot adjust the natural frequency up and down according to the target value. The manufacturing cost is high when there are multiple models, and it is difficult to meet the test needs of diesel engine manufacturers. Summary of the invention

[0006] The purpose of the present invention is to address the defects of the prior art and to provide a follow-up hydraulic vibration reduction device, system and method. Through the cooperation of a hydraulic cylinder with an elastic telescopic structure, the hydraulic support force can be automatically adjusted according to the operating state of the equipment to be vibration reduced, thereby adjusting the frequency of the offset test system and reducing the mechanical resonance at some rotation speeds of the equipment, thereby protecting the equipment as a whole.

[0007] The first object of the present disclosure is to provide a follow-up hydraulic vibration reduction device, which adopts the following technical solutions:

[0008] It comprises a hydraulic cylinder, one end of which is connected to an elastic telescopic mechanism, and the other end is connected to a ground rail fixing block via a length adjustment mechanism. The elastic telescopic mechanism comprises a telescopic rod coaxially connected to the hydraulic cylinder and a spring coaxially sleeved on the telescopic rod, and the spring is extended or shortened correspondingly with the movement of the telescopic rod; the length adjustment mechanism is used to change the distance between the hydraulic cylinder and the ground rail fixing block.

[0009] Furthermore, one end of the telescopic rod is connected to the end of the hydraulic cylinder, and the other end is used for articulating to the front vibration reduction device.

[0010] Furthermore, the telescopic rod includes a limiting sleeve and a first connecting rod, one end of the first connecting rod is inserted into the limiting sleeve, one end of the spring is pressed against the first connecting rod, and the other end is pressed against the limiting sleeve, and the length of the spring changes with the length of the first connecting rod in the limiting sleeve.

[0011] Furthermore, the length adjustment mechanism includes a second connecting rod and an adjusting sleeve, one end of the adjusting sleeve is connected to the hydraulic rod of the hydraulic cylinder, and the other end of the adjusting sleeve is connected to the ground rail fixing block through the second connecting rod.

[0012] The second object of the present disclosure is to provide a hydraulic vibration reduction system, which adopts the following technical solutions:

[0013] It includes the following hydraulic vibration reduction device as described above, the ground rail fixing block is installed on the ground rail, the hydraulic cylinder is connected to the hydraulic source, the vibration parameters of the equipment to be damped are obtained, and the vibration of the equipment to be damped is adjusted by controlling the following hydraulic vibration reduction device.

[0014] A third object of the present disclosure is to provide a hydraulic vibration reduction method, comprising the following steps:

[0015] The follow-up hydraulic vibration reduction device and the equipment to be vibration-reduced are fixed on the ground rail, and the hydraulic cylinder is connected to the equipment to be vibration-reduced through an elastic telescopic mechanism;

[0016] The follow-up hydraulic vibration reduction device is tensioned by the length adjustment mechanism, so that the spring is at the zero position and the hydraulic cylinder is at the initial position;

[0017] After the vibration reduction equipment is started, the hydraulic cylinder is driven to move, the effect of the follow-up hydraulic vibration reduction device on the vibration reduction equipment is changed, and the vibration parameters of the vibration reduction equipment are adjusted until the requirements are met.

[0018] Furthermore, the model of the equipment to be damped and the state of the follow-up hydraulic vibration damping device after being adjusted to meet the requirements are recorded, and they are matched, so that the state of the follow-up hydraulic vibration damping device that meets the requirements can be applied to the same model of equipment to be damped later.

[0019] Furthermore, the equipment to be vibration-damped is equipped with a plurality of follow-up hydraulic vibration-damping devices, which are respectively connected to a hydraulic source.

[0020] Compared with the prior art, the advantages and positive effects of the present disclosure are:

[0021] (1) Through the combination of hydraulic cylinder and elastic telescopic structure, the hydraulic support force can be automatically adjusted according to the operating status of the equipment to be damped, thereby adjusting the frequency of the offset test system and reducing the mechanical resonance at some speeds of the equipment, thereby protecting the entire equipment;

[0022] (2) It has an adaptive control function, which can be applied to the vibration reduction problem in the bench test of low-speed diesel engines of different models and different numbers of cylinders, and is more cost-effective than a one-to-one reinforcement solution;

[0023] (3) The structural design makes full use of existing structures such as the low-speed diesel engine base and the platform ground rail, which are easy to install and remove, greatly reducing the diesel engine vibration reduction processing time, saving the time that the diesel engine occupies the platform in the manufacturer, and thus improving production efficiency; the vibration reduction control system records related parameters such as engine model and number of cylinders, and diesel engines of the same model and number of cylinders can be debugged once and used multiple times, greatly simplifying the installation and debugging process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings constituting a part of the present disclosure are used to provide a further understanding of the present disclosure. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure.

[0025] Figure 1 It is a schematic diagram of the cooperation between the follow-up hydraulic vibration reduction device and the equipment to be vibration-reduced in Embodiments 1, 2, and 3 of the present disclosure;

[0026] Figure 2 It is a schematic diagram of the structure of the follow-up hydraulic vibration reduction device in Embodiments 1, 2, and 3 of the present disclosure;

[0027] Figure 3 It is a flowchart of the speed following control in Embodiments 1, 2 and 3 of the present disclosure.

[0028] In the figure, 1. diesel engine; 2. diesel engine lifting ear; 3. diesel engine cushion; 4. ground rail; 10. speed sensor; 11. hydraulic support rod; 12. hydraulic oil pipe; 13. ground rail fixing block; 14. hydraulic control station; 15. speed sensor cable; 21. first connecting rod; 22. linear spring; 23. limit sleeve; 24. fine-tuning nut; 25. second connecting rod; 26. oil inlet; 27. hydraulic cylinder; 28. oil return port; 29. ​​piston rod. DETAILED DESCRIPTION

[0029] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present disclosure belongs.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or their combinations;

[0031] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present disclosure, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present disclosure.

[0032] As introduced in the background technology, it is difficult to effectively support diesel engines during testing and running-in at the manufacturer in the prior art, resulting in poor versatility of some reinforcement schemes implemented by the manufacturer and difficulty in meeting the reinforcement needs of multiple models. To address the above problems, the present disclosure proposes a follow-up hydraulic vibration reduction device, system and method.

[0033] Example 1

[0034] In a typical embodiment of the present disclosure, Figure 1-Figure 3 As shown, a follow-up hydraulic vibration reduction device is proposed.

[0035] It mainly includes a hydraulic cylinder, an elastic telescopic mechanism and a length adjustment mechanism, wherein one end of the hydraulic cylinder is connected to the elastic telescopic mechanism, and the other end is connected to the ground rail fixing block through the length adjustment mechanism;

[0036] The hydraulic cylinder serves as a hydraulic support rod, with its two ends respectively connected to an elastic telescopic mechanism and a length adjustment structure. A given force is applied to the vibration reduction device through the hydraulic support rod to change the natural frequency of the diesel engine test system. Taking the vibration reduction device as a diesel engine as an example, the vibration intensity of the diesel engine at various speeds can be reduced, and mechanical resonance under a specific load can be avoided.

[0037] The elastic telescopic mechanism is extended or shortened under the combined action of the external force and the hydraulic cylinder. When extended, the internal elastic element is stretched and lengthened accordingly, and when shortened, the internal elastic element is squeezed and shortened accordingly, so that the whole mechanism exhibits different tensile forces or driving forces to the outside.

[0038] The elastic telescopic mechanism comprises a telescopic rod coaxially connected to a hydraulic cylinder and a spring coaxially sleeved on the telescopic rod, and the spring is extended or shortened correspondingly with the movement of the telescopic rod.

[0039] As for the length adjustment mechanism, the length adjustment mechanism comprises a second connecting rod and an adjusting sleeve, one end of the adjusting sleeve is connected to the hydraulic rod of the hydraulic cylinder, and the other end is connected to the ground rail fixing block through the second connecting rod;

[0040] The second connecting rod, the adjusting sleeve and the hydraulic rod are connected in sequence through threaded fitting and are coaxially arranged. The adjusting sleeve adjusts the distance between the first connecting rod and the hydraulic rod by rotating around the axis.

[0041] The extended front end of the piston rod 29 of the hydraulic cylinder 27 is designed with a 20mm long external thread, and the upper part of the second connecting rod 25 is also designed with a 20mm long external thread. The second connecting rod 25 and the piston rod 29 are connected by a fine-tuning nut 24. When the hydraulic support rod 11 is installed on site, the oil inlet pressure of the hydraulic cylinder 27 is adjusted to 0, and the piston rod 29 is retracted to the initial position;

[0042] The centering problem of the mounting holes of the first connecting rod and the second connecting rod can be adjusted by the fine-tuning nut 24. After the first connecting rod and the second connecting rod are tightened by bolts, the mounting gap can be eliminated by the fine-tuning nut 24.

[0043] One end of the telescopic rod is connected to the end of the hydraulic cylinder, and the other end is used for hinged front vibration reduction equipment; wherein the spring is a linear spring 22;

[0044] The telescopic rod includes a limiting sleeve and a first connecting rod. One end of the first connecting rod is inserted into the limiting sleeve. One end of the spring presses against the first connecting rod and the other end presses against the limiting sleeve. The length of the spring changes with the length of the first connecting rod in the limiting sleeve.

[0045] In this embodiment, reference Figure 2 The hydraulic vibration reduction device is composed of a first connecting rod, a linear spring, a limiting sleeve, a hydraulic cylinder, an adjusting sleeve and a second connecting rod connected in sequence;

[0046] The first connecting rod 21 and the limiting sleeve 23 are clearance-fitted and lubricated with grease, so that the first connecting rod can move a certain distance in the limiting sleeve;

[0047] A linear spring 22 is inserted between the first connecting rod 21 and the limiting sleeve 23, and the linear spring 22 is limited to be compressed and deformed in the axial direction of the first connecting rod 21; when the limiting sleeve 23 applies thrust to the linear spring 22, the linear spring 22 transmits the thrust upward to the first connecting rod 21, and then transmits the thrust to the diesel engine 1.

[0048] The limiting sleeve 23 is connected to the end of the hydraulic cylinder 27. When the piston rod 29 is driven downward by the pressure of the hydraulic cylinder, the extension of the piston rod 29 is blocked by the second connecting rod. The reaction force moves the hydraulic cylinder and the limiting sleeve 23 upward together, pushing the linear spring 22 to undergo compression deformation.

[0049] Among them, the adjusting sleeve is a fine-tuning nut with threaded holes at both ends, which can respectively cooperate with the threads at the end of the hydraulic cylinder piston rod and the end of the second connecting rod. By rotating it, the relative positions of the hydraulic cylinder piston rod and the end of the second connecting rod can be adjusted.

[0050] It is possible that, in order to facilitate the adjustment of the first connecting rod and the second connecting rod with the outside, the end portion thereof for matching the external structure can be set to a U-shaped structure, and the connecting rod can be fixed with the diesel engine lifting ear 2 and the ground rail fixing block 13 by bolts;

[0051] The fine-tuning nut can be used to facilitate positioning in the length direction, and can be manually pre-tightened during initial installation to ensure that the linear spring is in the zero position after the vibration reduction device is fixed as a whole.

[0052] When the hydraulic support rod 11 is initially installed, the output oil pressure of the hydraulic control station 14 is set to zero, and the hydraulic cylinder piston 29 is recovered to the initial position;

[0053] The oil inlet 26 and the oil return port 28 of the hydraulic cylinder 27 are connected to an external hydraulic source through a hydraulic oil pipe 12. In this embodiment, the hydraulic source may be a hydraulic control station 14, and the hydraulic oil pipe is a high-pressure armored hose.

[0054] When the oil inlet pressure of the hydraulic cylinder 27 increases, the hydraulic cylinder piston rod 29 is pushed downward, and the reaction force of the hydraulic cylinder causes the limiting sleeve 23 to move upward. The limiting sleeve applies thrust to the linear spring 22, and the linear spring 22 undergoes linear deformation. This force also acts on the base of the diesel engine 1.

[0055] The magnitude of the force is proportional to the hydraulic cylinder oil pressure, so a controllable and predictable support force can be obtained by providing a controllable and predictable oil supply pressure to the hydraulic cylinder 27, thereby realizing the natural vibration frequency offset control of the diesel engine 1 test system. The magnitude of the hydraulic pressure is calculated from parameters such as the diesel engine speed, diesel engine type and number of cylinders.

[0056] Through the combination of hydraulic cylinder and elastic telescopic structure, the hydraulic support force can be automatically adjusted according to the operating status of the equipment to be damped, thereby adjusting the frequency of the offset test system and reducing the mechanical resonance at some speeds of the equipment, thereby protecting the equipment as a whole.

[0057] Example 2

[0058] In another typical embodiment of the present disclosure, Figure 1-Figure 3 As shown, a hydraulic vibration reduction system is proposed.

[0059] It includes a plurality of follow-up hydraulic vibration reduction devices and control systems as described in Example 1; wherein the hydraulic cylinder is connected to a hydraulic control station;

[0060] See also Figure 1 Two or four hydraulic support rods 11 are symmetrically distributed near the free end and the driving end of the low-speed diesel engine 1, and both ends are connected between the diesel engine base lifting ear 2 and the platform ground rail 4; the diesel engine is installed on the ground rail through the diesel engine pad.

[0061] By applying a given force to the diesel engine 1 through the hydraulic support rod 11 to change the natural frequency of the diesel engine test system, the vibration intensity of the diesel engine 1 at various speeds can be reduced and mechanical resonance under a specific load can be avoided.

[0062] The hydraulic control station 14 is equipped with a variable frequency pump station, a PLC control cabinet, and a human-machine interactive operation interface; the control system is divided into a manual mode and an automatic mode.

[0063] In manual mode, there is no diesel engine speed following control, and the user manually sets the hydraulic support force through the human-machine interface, which is generally used in system debugging;

[0064] In automatic mode, the PLC control cabinet obtains the current speed of the diesel engine 1 through the speed sensor 10, and automatically searches for the target hydraulic pressure according to the model data and speed-pressure curve diagram stored in advance, so that the hydraulic support rod applies different forces to the diesel engine 1 at different speeds, thereby achieving a wider range and more accurate vibration reduction effect.

[0065] Compared with the traditional vibration reduction device, the hydraulic vibration reduction device with follower control is used to improve the problem of high vibration intensity of low-speed diesel engines by applying a controlled comparable case to the diesel engine;

[0066] And through the automatic mode, the force can be automatically adjusted according to the set engine model and real-time speed signal, so that one system can solve the vibration reduction problem of low-speed diesel engine bench test system with various models and different number of cylinders. It is suitable for various models and suitable for bench test in low-speed diesel engine manufacturers. Compared with the traditional one-to-one reinforcement solution, it is more cost-effective overall.

[0067] Example 3

[0068] In yet another typical embodiment of the present disclosure, a hydraulic vibration reduction method is provided.

[0069] Using the hydraulic vibration reduction system disclosed in Example 2, the following steps are included:

[0070] A plurality of follow-up hydraulic vibration reduction devices and the equipment to be vibration-reduced are fixed on the ground rail, and a plurality of corresponding hydraulic cylinders are respectively connected to the hydraulic source, and the hydraulic cylinders are connected to the equipment to be vibration-reduced through an elastic telescopic mechanism;

[0071] The follow-up hydraulic vibration reduction device is tensioned by the length adjustment mechanism, so that the spring is at the zero position and the hydraulic cylinder is at the initial position;

[0072] After the vibration reduction equipment is started, the hydraulic cylinder is driven to move, the effect of the follow-up hydraulic vibration reduction device on the vibration reduction equipment is changed, and the vibration parameters of the vibration reduction equipment are adjusted until the requirements are met;

[0073] Record the model of the equipment to be damped and the state of the follow-up hydraulic vibration damping device after adjustment to meet the requirements, match them, and apply the state of the follow-up hydraulic vibration damping device that meets the requirements to the same model of equipment to be damped later.

[0074] In this embodiment, combined with Figure 3 The speed sensor 10 is installed at the free end of the low-speed diesel engine 1. The speed sensor is connected to the hydraulic control station through the speed sensor cable 15. The speed signal of the diesel engine 1 enters the hydraulic control station 14, and the speed information of the diesel engine 1 is converted and calculated by the high-speed pulse input module of the PLC control cabinet;

[0075] The PLC control program pre-stores the speed-support force chart data corresponding to different low-speed diesel engine models (and different cylinder numbers). When the hydraulic control station 14 is set to automatic mode, the system program will query the support force that the current hydraulic support rod 11 needs to apply based on the real-time diesel engine speed signal and the pre-stored chart data, and calculate the real-time output target oil pressure P of the hydraulic station through conversion. i ;

[0076] The control program calculates the target oil pressure P i After that, the real-time hydraulic pressure P will be obtained through the hydraulic station outlet pressure sensor o The oil supply pressure of the hydraulic cylinder 27 is dynamically adjusted by calculating the frequency converter frequency through the PID adjustment algorithm to control the speed of the variable frequency pump motor.

[0077] Thereby, the hydraulic support rod 11 applies a variable support force to the diesel engine 1 that follows the rotation speed, thereby achieving a wider range and more precise vibration reduction effect.

[0078] The speed feedback control is adopted, which can change the natural frequency offset of the diesel engine under different speeds and loads in real time, making the vibration reduction processing range wider than that of the fixed support vibration reduction device and having strong adaptability; by memorizing the model, number of cylinders and other related parameters through the control module, the diesel engine of the same model and number of cylinders can be used multiple times after one debugging, which greatly simplifies the installation and debugging process.

[0079] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A hydraulic vibration reduction method for a follow-up hydraulic vibration reduction device, characterized in that: The following hydraulic vibration reduction device comprises a hydraulic cylinder, one end of which is connected to an elastic telescopic mechanism, and the other end of which is connected to a ground rail fixing block via a length adjustment mechanism. The elastic telescopic mechanism comprises a telescopic rod coaxially connected to the hydraulic cylinder and a spring coaxially sleeved on the telescopic rod, and the spring is extended or shortened correspondingly with the movement of the telescopic rod; the length adjustment mechanism is used to change the distance between the hydraulic cylinder and the ground rail fixing block; The length adjustment mechanism comprises a second connecting rod and an adjusting sleeve, one end of the adjusting sleeve is connected to the hydraulic rod of the hydraulic cylinder, and the other end is connected to the ground rail fixing block through the second connecting rod; The second connecting rod, the adjusting sleeve and the hydraulic rod are connected in sequence by threaded fitting and are coaxially arranged, and the adjusting sleeve adjusts the distance between the second connecting rod and the hydraulic rod by rotating around the axis; One end of the telescopic rod is connected to the end of the hydraulic cylinder, and the other end is used for hingedly facing the vibration reduction device; The telescopic rod comprises a limiting sleeve and a first connecting rod, one end of the first connecting rod is inserted into the limiting sleeve, one end of the spring presses against the first connecting rod, and the other end presses against the limiting sleeve, and the length of the spring changes with the length of the first connecting rod in the limiting sleeve; The hydraulic vibration reduction method comprises the following steps: The follow-up hydraulic vibration reduction device and the equipment to be vibration-reduced are fixed on the ground rail, and the hydraulic cylinder is connected to the equipment to be vibration-reduced through an elastic telescopic mechanism; The follow-up hydraulic vibration reduction device is tensioned by the length adjustment mechanism, so that the spring is at the zero position and the hydraulic cylinder is at the initial position; After the vibration reduction device is started, the hydraulic cylinder is driven to move. When the pressure at the oil inlet of the hydraulic cylinder increases, the piston rod of the hydraulic cylinder is pushed downward. The reaction force of the hydraulic cylinder causes the limit sleeve to move upward. The limit sleeve applies thrust to the spring, which deforms and changes the supporting force of the follow-up hydraulic vibration reduction device on the vibration reduction device. Specifically, the current speed of the vibration reduction device is obtained through a speed sensor, and the target hydraulic pressure is automatically found according to the model data and speed-pressure curve diagram stored in advance, so that the vibration reduction device can apply different supporting forces to the vibration reduction device at different speeds. Speed ​​feedback control is used to change the natural frequency offset of the vibration reduction device under different speed loads in real time.

2. The hydraulic vibration reduction method according to claim 1, characterized in that: Record the model of the equipment to be damped and the state of the follow-up hydraulic vibration damping device after adjustment to meet the requirements, match them, and apply the state of the follow-up hydraulic vibration damping device that meets the requirements to the same model of equipment to be damped later.

3. The hydraulic vibration reduction method according to claim 1, characterized in that: The equipment to be vibration-damped is equipped with a plurality of follow-up hydraulic vibration-damping devices, which are respectively connected to a hydraulic source.

4. A hydraulic vibration reduction system of a follow-up hydraulic vibration reduction device, characterized in that: The following hydraulic vibration reduction device comprises a hydraulic cylinder, one end of which is connected to an elastic telescopic mechanism, and the other end of which is connected to a ground rail fixing block via a length adjustment mechanism. The elastic telescopic mechanism comprises a telescopic rod coaxially connected to the hydraulic cylinder and a spring coaxially sleeved on the telescopic rod, and the spring is extended or shortened correspondingly with the movement of the telescopic rod; the length adjustment mechanism is used to change the distance between the hydraulic cylinder and the ground rail fixing block; The length adjustment mechanism comprises a second connecting rod and an adjusting sleeve, one end of the adjusting sleeve is connected to the hydraulic rod of the hydraulic cylinder, and the other end is connected to the ground rail fixing block through the second connecting rod; The second connecting rod, the adjusting sleeve and the hydraulic rod are connected in sequence by threaded fitting and are coaxially arranged, and the adjusting sleeve adjusts the distance between the second connecting rod and the hydraulic rod by rotating around the axis; One end of the telescopic rod is connected to the end of the hydraulic cylinder, and the other end is used for hingedly facing the vibration reduction device; The telescopic rod comprises a limiting sleeve and a first connecting rod, one end of the first connecting rod is inserted into the limiting sleeve, one end of the spring presses against the first connecting rod, and the other end presses against the limiting sleeve, and the length of the spring changes with the length of the first connecting rod in the limiting sleeve; The hydraulic vibration reduction system is configured as follows: the follow-up hydraulic vibration reduction device and the equipment to be vibration reduced are both fixed on the ground rail, and the hydraulic cylinder is connected to the equipment to be vibration reduced through an elastic telescopic mechanism; The follow-up hydraulic vibration reduction device is tensioned by the length adjustment mechanism, so that the spring is at the zero position and the hydraulic cylinder is at the initial position; After the vibration reduction equipment is started, the hydraulic cylinder is driven to move. When the pressure at the oil inlet of the hydraulic cylinder increases, the piston rod of the hydraulic cylinder is pushed downward. The reaction force of the hydraulic cylinder causes the limit sleeve to move upward. The limit sleeve applies thrust to the spring, and the spring is deformed, thereby changing the supporting force of the follow-up hydraulic vibration reduction device on the vibration reduction equipment. Specifically, the current speed of the vibration reduction equipment is obtained through the speed sensor, and the target hydraulic pressure is automatically found according to the model data and speed-pressure curve diagram stored in advance, so that the vibration reduction device can apply different supporting forces to the vibration reduction equipment at different speeds. Speed ​​feedback control is used to change the natural frequency offset of the equipment to be damped under different speed loads in real time.

5. The hydraulic vibration reduction system according to claim 4, characterized in that: The ground rail fixing block is installed on the ground rail, the hydraulic cylinder is connected to the hydraulic source, the vibration parameters of the equipment to be damped are obtained, and the vibration of the equipment to be damped is adjusted by controlling the follow-up hydraulic damping device.

Images