Damper with stepless damping force regulation and control function and damping system

Abstract

The utility model provides a damper capable of steplessly regulating and controlling damping force and a damping system. The damper capable of steplessly regulating and controlling the damping force comprises an oil cylinder body, a cylinder cover, a piston, a piston rod, a first connecting lug plate, a connecting body, a second connecting lug plate and a servo electromagnetic control valve. When two structural units of a civil structure generate relative displacement under the action of an earthquake or other external force, the acting force is transmitted to the oil cylinder body and the piston through the piston rod and the connecting body, so that the piston and the oil cylinder body generate relative movement; the oil flow between the first damping cavity and the second damping cavity can be controlled by controlling the opening degree of the servo electromagnetic control valve so as to adjust the damping force, when the oil flow is increased, the damping force is reduced, and when the oil flow is reduced, the damping force is increased, so that the damping force can be steplessly adjusted and controlled according to the earthquake action or other external force; and the safety of the civil structure is effectively guaranteed while the requirement for buffering the two structural units of the civil structure is met.

Description

Technical Field

[0001] The utility model relates to the field of dampers, and specifically, to a damper and a damping system with stepless damping force regulation. Background Technique

[0002] When civil engineering structures are excited by external dynamic loads such as earthquakes, pedestrians, vehicles, and strong winds, they are prone to large-amplitude vibrations, which greatly affect the comfort and safety of the structures. For civil structures, an effective means to reduce the impact of earthquakes and vibrations is to adopt the seismic isolation (vibration reduction) method, that is, to adopt seismic isolation (vibration reduction) devices in civil structures such as bridges and building structures to reduce the impact of vibrations on the structures.

[0003] Functionally, seismic isolation (vibration reduction) devices are divided into three types: vibration reduction devices, seismic isolation devices, or integrated seismic isolation and vibration reduction devices. Dampers are one of the commonly used and most widely marketed vibration reduction devices. Vibration reduction devices can be divided into passive control, active control, semi-active control, and hybrid control according to whether external energy control is required, and most commonly used dampers are passive control.

[0004] Regarding active control and semi-active control dampers, in recent years, domestic and foreign scholars have been continuously researching new types of dampers. Among them, eddy current technology and magnetorheological technology can be used as technical means for active control and semi-active control dampers to achieve the purpose of precise active control of structural vibrations, and also lay the foundation for the intelligent construction and operation and maintenance of civil structures in terms of intelligent seismic isolation components. Among them, eddy current dampers change the magnitude of the formed eddy current by changing the magnetic field magnitude, and then change the damping force magnitude; magnetorheological dampers change the viscosity characteristics of the viscous oil by changing the magnetic field magnitude, and then change the damping force magnitude.

[0005] Eddy current dampers mainly have the disadvantages of small damping force and large size. At the same time, it is difficult to control the magnetism of the built-in magnet, and the technical means to achieve active control are relatively complex. Currently, it is still in the research stage; in addition, the cost is also very high.

[0006] Magnetorheological dampers mainly have the problems that the particles inside the magnetorheological fluid are prone to sinking, resulting in poor performance stability; there are particles inside the magnetorheological fluid, which easily affect the sealing, leading to a short service life of the seals; and the cost is high. Content of the Utility Model

[0007] The main purpose of the utility model is to provide a damper and a damping system with stepless damping force regulation, so as to solve at least the problems of small damping force, large size, complex control means, poor performance stability, and high cost existing in active control dampers such as eddy current dampers and magnetorheological dampers in the prior art.

[0008] To achieve the above object, according to the first aspect of the present utility model, a damper with steplessly adjustable damping force is provided, comprising: an oil cylinder body; two cylinder heads which are correspondingly arranged at both ends of the oil cylinder body to seal the oil cylinder body, and slide holes axially opposite are provided at the centers of the two cylinder heads; a piston which is movably arranged in the oil cylinder body along the axial direction of the oil cylinder body to divide the inner cavity of the oil cylinder body into a first damping cavity and a second damping cavity with variable volumes; a piston rod which passes through the piston along the axial direction of the oil cylinder body from the central part of the piston and is fixedly connected with the piston, and both ends of the piston rod slidably pass through the slide holes of the two cylinder heads correspondingly and extend to the outside of the oil cylinder body; a first connecting ear plate fixedly arranged at the first end of the piston rod; a connecting body arranged at one end of the oil cylinder body and corresponding to the second end of the piston rod; a second connecting ear plate fixedly arranged on the connecting body; a servo electromagnetic control valve arranged on the oil cylinder body; wherein, a first oil hole communicating with the first damping cavity and a second oil hole communicating with the second damping cavity are provided on the oil cylinder body, and the servo electromagnetic control valve is correspondingly communicated with the first damping cavity and the second damping cavity through the first oil hole and the second oil hole; the servo electromagnetic control valve is used for controlling the opening size of its valve to adjust the oil flow between the first damping cavity and the second damping cavity when the piston moves along the oil cylinder body so as to adjust the damping force.

[0009] Further, both the first oil hole and the second oil hole are two, the two first oil holes are symmetrically arranged along the radial direction of the oil cylinder body, and the two second oil holes are symmetrically arranged along the radial direction of the oil cylinder body; the servo electromagnetic control valves are two and are symmetrically arranged along the radial direction of the oil cylinder body; wherein, the two oil ports of each servo electromagnetic control valve are respectively communicated with the corresponding first oil hole and second oil hole through a first high-pressure oil pipe and a second high-pressure oil pipe.

[0010] Further, the first oil hole and the second oil hole are provided close to the inner side walls of the two cylinder heads.

[0011] Further, a plurality of first annular sealing grooves are provided on the inner wall of the slide hole of the cylinder head, and a first sealing ring is arranged in each first annular sealing groove to slidably seal the outer wall of the piston rod and the inner wall of the slide hole.

[0012] Further, a plurality of second annular sealing grooves are provided on the outer peripheral side wall of the piston, and a second sealing ring is arranged in each second annular sealing groove to slidably seal the outer peripheral side wall of the piston and the inner side wall of the oil cylinder body.

[0013] Further, the connecting body is a cylindrical structure with one end closed and one end open, and the open end of the connecting body is connected with one end of the oil cylinder body through a threaded structure and closes the second end of the piston rod.

[0014] Further, both the first connecting ear plate and the second connecting ear plate are provided with connecting holes, and a spherical plain bearing is arranged in the connecting holes.

[0015] According to a second aspect of the present utility model, a damping system for steplessly regulating damping force is provided, comprising: a vibration signal sensor disposed on a civil structure, the vibration signal sensor being configured to monitor an acceleration signal or a displacement signal of the civil structure; a controller, the controller being connected to the vibration signal sensor and receiving the acceleration signal or the displacement signal monitored by the vibration signal sensor; a damper, the damper being the damper described above, and a servo electromagnetic control valve of the damper being connected to the controller; wherein the controller is configured to send a control signal to the servo electromagnetic control valve according to the received acceleration signal or displacement signal to control the opening size of the valve of the servo electromagnetic control valve to adjust the oil flow between the first damping chamber and the second damping chamber so as to adjust the damping force of the damper.

[0016] The damper with steplessly adjustable damping force of the technical solution of the present utility model includes an oil cylinder body, a cylinder head, a piston, a piston rod, a first connecting ear plate, a connecting body, a second connecting ear plate and a servo electromagnetic control valve; there are two cylinder heads, and the two cylinder heads are correspondingly arranged at both ends of the oil cylinder body to seal the oil cylinder body, and axially opposite sliding holes are opened in the centers of the two cylinder heads; the piston is axially movably arranged in the oil cylinder body to divide the inner cavity of the oil cylinder body into a first damping cavity and a second damping cavity with variable volumes; the piston rod passes through the piston axially from the central part of the piston and is fixedly connected to the piston, and both ends of the piston rod slidably pass through the sliding holes of the two cylinder heads correspondingly and extend to the outside of the oil cylinder body; the first connecting ear plate is fixedly arranged at the first end of the piston rod; the connecting body is arranged at one end of the oil cylinder body and corresponds to the second end of the piston rod; the second connecting ear plate is fixedly arranged on the connecting body; the first connecting ear plate and the second connecting ear plate are respectively correspondingly connected to two relatively movable structural units of the civil structure, and the servo electromagnetic control valve is arranged on the oil cylinder body; a first oil hole communicating with the first damping cavity and a second oil hole communicating with the second damping cavity are opened on the oil cylinder body, and the servo electromagnetic control valve is correspondingly communicated with the first damping cavity and the second damping cavity through the first oil hole and the second oil hole; when an earthquake or other external forces cause relative displacement between the two structural units of the civil structure, the acting force will be transmitted to the oil cylinder body and the piston through the piston rod and the connecting body, causing relative movement between the piston and the oil cylinder body. The first damping cavity and the second damping cavity of the oil cylinder body are both filled with viscous oil, and the relative movement between the piston and the oil cylinder body will cause the viscous oil in the first damping cavity and the second damping cavity to flow through the servo electromagnetic control valve. By controlling the opening size of the servo electromagnetic control valve, the oil flow rate between the first damping cavity and the second damping cavity can be controlled to adjust the damping force. When the oil flow rate increases, the damping force decreases, and when the oil flow rate decreases, the damping force increases. Thus, the damping force can be steplessly adjusted according to the magnitude of the earthquake or other external forces, effectively ensuring the safety of the civil structure while meeting the buffering of the two structural units of the civil structure. The technical solution of the present utility model realizes precise control of the damping force by controlling the oil flow rate of the damper, has a simple structure, stable performance and low cost, and solves the problems of small damping force, large size, complex control means, poor performance stability and high cost existing in active control dampers such as eddy current dampers and magnetorheological dampers in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings forming a part of this application are used to provide a further understanding of the present utility model, and the schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0018] Figure 1 is an external structural schematic diagram of a damper with steplessly adjustable damping force according to an optional embodiment of the present utility model;

[0019] Figure 2 is a schematic cross-sectional structure diagram of a damper with stepless damping force regulation according to an embodiment of the present invention;

[0020] Figure 3 is a structural block diagram of a damping system with stepless damping force regulation according to an embodiment of the present invention.

[0021] Among them, the above-mentioned drawings include the following reference numerals:

[0022] 10. Cylinder body; 11. First damping chamber; 12. Second damping chamber; 13. First oil hole; 14. Second oil hole; 20. Cylinder head; 30. Piston; 40. Piston rod; 50. First connecting ear plate; 60. Connecting body; 70. Second connecting ear plate; 80. Servo electromagnetic control valve; 81. First high-pressure oil pipe; 82. Second high-pressure oil pipe; 90. First sealing ring; 100. Second sealing ring; 110. Spherical plain bearing; 120. Vibration signal sensor; 130. Controller; 140. Damper. Detailed implementation manners

[0023] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0024] The first embodiment of the present invention provides a damper with stepless damping force regulation, as shown in Figure 1 and Figure 2As shown in the figure, it includes an oil cylinder body 10, a cylinder head 20, a piston 30, a piston rod 40, a first connecting ear plate 50, a connecting body 60, a second connecting ear plate 70 and a servo electromagnetic control valve 80; there are two cylinder heads 20, and the two cylinder heads 20 are correspondingly arranged at both ends of the oil cylinder body 10 to seal the oil cylinder body 10. Axially opposite sliding holes are opened in the centers of the two cylinder heads 20; the piston 30 is axially movably arranged in the oil cylinder body 10 to divide the inner cavity of the oil cylinder body 10 into a first damping cavity 11 and a second damping cavity 12 with variable volumes; the piston rod 40 axially passes through the piston 30 from the central part of the piston 30 and is fixedly connected to the piston 30. Both ends of the piston rod 40 slidably pass through the sliding holes of the two cylinder heads 20 correspondingly and extend to the outside of the oil cylinder body 10; the first connecting ear plate 50 is fixedly arranged at the first end of the piston rod 40; the connecting body 60 is arranged at one end of the oil cylinder body 10 and corresponds to the second end of the piston rod 40; the second connecting ear plate 70 is fixedly arranged on the connecting body 60; the first connecting ear plate 50 and the second connecting ear plate 70 are respectively correspondingly connected to two relatively movable structural units of the civil structure, and the servo electromagnetic control valve 80 is arranged on the oil cylinder body 10; a first oil hole 13 communicating with the first damping cavity 11 and a second oil hole 14 communicating with the second damping cavity 12 are opened on the oil cylinder body 10, and the servo electromagnetic control valve 80 is correspondingly communicated with the first damping cavity 11 and the second damping cavity 12 through the first oil hole 13 and the second oil hole 14; when an earthquake or other external forces cause relative displacement between the two structural units of the civil structure, the acting force will be transmitted to the oil cylinder body 10 and the piston 30 through the piston rod 40 and the connecting body 60, causing relative movement between the piston 30 and the oil cylinder body 10. The first damping cavity 11 and the second damping cavity 12 of the oil cylinder body 10 are both filled with viscous oil. The relative movement between the piston 30 and the oil cylinder body 10 will cause the viscous oil in the first damping cavity 11 and the second damping cavity 12 to flow through the servo electromagnetic control valve 80. By controlling the opening size of the servo electromagnetic control valve 80, the oil flow rate between the first damping cavity 11 and the second damping cavity 12 can be controlled to adjust the damping force. When the oil flow rate increases, the damping force decreases; when the oil flow rate decreases, the damping force increases. Thus, the damping force can be steplessly adjusted according to the magnitude of the earthquake or other external forces, effectively ensuring the safety of the civil structure while meeting the buffering of the two structural units of the civil structure. The solution of the present utility model realizes precise control of the damping force by controlling the oil flow rate of the damper, has a simple structure, stable performance and low cost, and solves the problems of small damping force, large size, complex control means, poor performance stability and high cost existing in active control dampers such as eddy current dampers and magnetorheological dampers in the prior art.

[0025] In specific implementation, the damper of this embodiment is mainly applied to the bridge field. The first connecting ear plate 50 and the second connecting ear plate 70 are respectively connected to the bridge pier and the beam body of the bridge, so as to buffer the longitudinal displacement of the beam body under the action of earthquake or external force. In order to quickly adjust the oil flow rate between the first damping chamber 11 and the second damping chamber 12 and increase the upper limit of the flow rate adjustment, further, both the first oil hole 13 and the second oil hole 14 are two. The two first oil holes 13 are symmetrically arranged along the radial direction of the cylinder body 10, and the two second oil holes 14 are symmetrically arranged along the radial direction of the cylinder body 10; there are two servo electromagnetic control valves 80 and they are symmetrically arranged along the radial direction of the cylinder body 10; the two oil ports of each servo electromagnetic control valve 80 are respectively communicated with the corresponding first oil hole 13 and second oil hole 14 through the first high-pressure oil pipe 81 and the second high-pressure oil pipe 82. By controlling the opening sizes of the two servo electromagnetic control valves 80, the oil volume in the oil passage between the first damping chamber 11 and the second damping chamber 12 is controlled, so as to achieve precise and rapid adjustment of the damping force to buffer the vibration and impact of external forces on the civil structure.

[0026] Further, the first oil hole 13 and the second oil hole 14 are arranged close to the inner side walls of the two cylinder heads 20, that is, the first oil hole 13 and the second oil hole 14 are arranged at both ends of the inner cavity of the cylinder body 10, so as to ensure that the moving stroke of the piston 30 inside the cylinder body 10 will not affect the first oil hole 13 and the second oil hole 14. Optionally, annular step grooves are formed on the circumferential edges of the two side walls of the piston 30. When the piston 30 moves to the extreme positions at both ends and contacts the cylinder head 20, the annular step grooves can expose the first oil hole 13 and the second oil hole 14 to prevent the first oil hole 13 and the second oil hole 14 from being blocked and affecting the mutual flow of the oil.

[0027] Further, multiple first annular sealing grooves are formed on the inner wall of the sliding hole of the cylinder head 20, and a first sealing ring 90 is arranged in each first annular sealing groove to slidably seal the outer wall of the piston rod 40 and the inner wall of the sliding hole; to ensure that when the piston 30 moves under high pressure, the oil in the first damping chamber 11 and the second damping chamber 12 will not leak from the gap between the piston rod 40 and the sliding hole. Optionally, an external thread structure is formed on the outer peripheral wall of the cylinder head 20, and an internal thread structure is formed at the corresponding position on the inner side wall of the cylinder body 10. The cylinder head 20 is installed on the cylinder body 10 through the thread structure so that components such as the cylinder head 20, the piston 30 and the piston rod 40 can be removed from the cylinder body 10; optionally, a sealing ring is also arranged between the outer peripheral wall of the cylinder head 20 and the inner side wall of the cylinder body 10 to ensure that the oil in the first damping chamber 11 and the second damping chamber 12 will not leak.

[0028] Further, there are multiple second annular sealing grooves on the outer peripheral side wall of the piston 30. A second sealing ring 100 is arranged in each second annular sealing groove to slidably seal the outer peripheral side wall of the piston 30 and the inner side wall of the oil cylinder body 10, so that the first damping chamber 11 and the second damping chamber 12 are sealed from each other, ensuring that the oil can flow and be adjusted through the servo electromagnetic control valve 80 as much as possible, and ensuring the accuracy of damping force adjustment.

[0029] Further, the connecting body 60 is a cylindrical structure with one end closed and one end open. The open end of the connecting body 60 is connected to one end of the oil cylinder body 10 through a threaded structure and closes the second end of the piston rod 40.

[0030] Further, both the first connecting ear plate 50 and the second connecting ear plate 70 are provided with connecting holes, and spherical plain bearings 110 are arranged in the connecting holes, which can make the axis direction of the oil cylinder body 10 always consistent with the acting force direction, so as to ensure that the acting force between the two structural units of the civil structure always acts on the oil cylinder body 10 and the piston 30 along the axis direction, and protect the oil cylinder body 10 and the piston 30 when the acting force is skewed.

[0031] The second embodiment of the present invention provides a damping system for steplessly regulating the damping force, as Figure 3 shown, including a vibration signal sensor 120, a controller 130 and a damper 140. The vibration signal sensor 120 is arranged on the civil structure. The vibration signal sensor 120 is used to monitor the acceleration signal or displacement signal of the civil structure during an earthquake or external force. The stronger the acceleration signal or displacement signal, the stronger the earthquake or external force; the controller 130 is connected to the vibration signal sensor 120 and receives the acceleration signal or displacement signal monitored by the vibration signal sensor 120, judges the intensity of the earthquake or external force according to the acceleration signal or displacement signal, and accurately calculates the required damping force at the same time; the damper 140 is connected to the controller 130, and the damper 140 is the damper of the above embodiment; the controller 130 is connected to the servo electromagnetic control valve 80 of the damper 140. The controller 130 is used to send a control signal to the servo electromagnetic control valve 80 according to the calculated required damping force, and control the oil flow between the first damping chamber 11 and the second damping chamber 12 by controlling the opening size of the servo electromagnetic control valve 80, thereby adjusting the damping force of the damper 140, buffering the earthquake and external force, and providing effective protection.

[0032] Optionally, the two servo electromagnetic control valves 80 can be controlled independently or synchronously, which improves the upper limit of oil regulation. When the oil flow rate increases, the damping force decreases; when the oil flow rate decreases, the damping force increases. Thus, the damping force can be regulated according to the magnitude of seismic action or other external forces, effectively ensuring the safety of the civil structure while meeting the buffering requirements for the two structural units of the civil structure. The solution of the present utility model realizes precise control of the damping force by controlling the oil flow rate of the damper, with a simple structure, stable performance and low cost, solving the problems of small damping force, large size, complex control means, poor performance stability and high cost existing in active control dampers such as eddy current dampers and magnetorheological dampers in the prior art.

[0033] The damping system of the embodiment of the present utility model has the following two different working states:

[0034] When both servo electromagnetic control valves 80 are fully closed, there is no oil passage between the first damping chamber 11 and the second damping chamber 12. At this time, the two structural units of the civil structure apply thrust to the cylinder body 10 and the piston rod 40, and the piston 30 and the piston rod 40 cannot move relatively with respect to the cylinder body 10. The device is in a locked state and resists the force between the two structural units.

[0035] When the two servo electromagnetic control valves 80 are opened, the viscous oil flow rates of the first damping chamber 11 and the second damping chamber 12 are steplessly regulated by the opening degrees of the two servo electromagnetic control valves 80. When the opening degree of the servo electromagnetic control valve 80 is small, the external structural unit applies thrust to the piston rod 40, and the piston 30 and the piston rod 40 move relatively slowly; or when the relative movement speed of the piston rod 40 and the piston 30 with respect to the cylinder body 10 given by the external structural unit is constant, the piston rod 40 applies a large damping force to the external structural unit. When the opening degree of the servo electromagnetic control valve 80 is large, the viscous oil flow rates of the first damping chamber 11 and the second damping chamber 12 are large. When the thrust applied by the external structural unit to the piston rod 40 is the same, the relative movement speed of the piston 30 and the piston rod 40 is large, or when the relative movement speed of the piston rod 40 and the piston 30 with respect to the cylinder body 10 given by the external structural unit is constant, the damping force applied by the piston rod 40 to the external structural unit is small.

[0036] The valve opening degree (from 0% to 100%) of the servo electromagnetic control valve 80 can be continuously controlled. Therefore, when the thrust applied by the external structural unit to the piston rod 40 is the same, the relative movement speed of the piston 30 with respect to the cylinder body 10 can be continuously controlled from small to large, or when the relative movement speed of the piston rod 40 and the piston 30 with respect to the cylinder body 10 given by the external structural unit is constant, the damping force applied by the piston rod 40 to the external structural unit can be continuously controlled from large to small.

[0037] The opening degree of the servo electromagnetic control valve 80 can be controlled according to the magnitude of vibration or seismic acceleration or other monitored physical quantities, so as to control the damping force of the damper and achieve the purpose of active control.

[0038] Among them, the general formula of the viscous damper is: F = CV α

[0039] F - damping force; C - damping coefficient of viscous oil; V - relative movement speed between the piston 30 and the cylinder block 10; α - speed index.

[0040] Among them, the speed index is related to the flow rate of the servo electromagnetic control valve 80 and the lengths of the first high-pressure oil pipe 81 and the second high-pressure oil pipe 82. When the flow rate of the servo electromagnetic control valve 80 changes, the magnitude of the speed index α can be controlled, thereby controlling the damping force.

[0041] In the damping system for steplessly regulating the damping force according to the embodiment of the present invention, the vibration signal sensor 120 can be an acceleration sensor, a displacement sensor or other types of sensors. A sensor such as an acceleration sensor transmits the vibration or seismic acceleration signal generated by the structure to the controller 130. The controller 130 is an MCU or a PLC. The controller 130 controls the opening degree of the servo electromagnetic control valve 80 through a driving circuit, thereby actively controlling the magnitude of the damping force of the damper.

[0042] The damper and damping system for steplessly regulating the damping force of the present invention have the following technical effects:

[0043] By changing the oil flow of the viscous damper, the damper of the present invention can truly achieve the purpose of steplessly and continuously regulating the damping force; it can solve the problem of large differences in damping force between high temperature and low temperature of the viscous damper, and solve the problem of unstable performance of the viscous damper from the control aspect; when the damper is in the normal working state (such as when there is no earthquake or vibration condition, the damper only generates the temperature displacement of the structure), the oil circuit is fully opened, with a very small damping force, and there is almost no oil pressure inside the cylinder block, which can increase the service life of seals such as sealing rings, thereby increasing the service life of the damper. In addition, the servo electromagnetic control valve 80 is outside the cylinder block, which is convenient for maintenance, repair and replacement.

[0044] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A damper for steplessly regulating damping force, characterized in that: include: Cylinder body (10); Cylinder heads (20), two of the cylinder heads (20), the two cylinder heads (20) being correspondingly arranged at the two ends of the oil cylinder body (10) to seal the oil cylinder body (10), and the centers of the two cylinder heads (20) are each provided with axially opposite sliding holes; A piston (30) is movably arranged in the cylinder body (10) along the axial direction of the cylinder body (10) to separate the inner cavity of the cylinder body (10) into a first damping cavity (11) and a second damping cavity (12) with variable volumes; A piston rod (40), wherein the piston rod (40) passes through the piston (30) along the axial direction of the cylinder body (10) from the center of the piston (30) and is fixedly connected to the piston (30), and the two ends of the piston rod (40) correspondingly slidably pass through the sliding holes of the two cylinder covers (20) and extend to the outside of the cylinder body (10); A first connecting ear plate (50) fixedly disposed on a first end of the piston rod (40); A connecting body (60) is arranged at one end of the oil cylinder body (10) and corresponds to the second end of the piston rod (40); A second connecting ear plate (70) is fixedly arranged on the connecting body (60); A servo electromagnetic control valve (80) is arranged on the cylinder body (10); The cylinder body (10) is provided with a first oil hole connected to the first damping chamber (11) and a second oil hole connected to the second damping chamber (12); the servo electromagnetic control valve (80) is connected to the first damping chamber (11) and the second damping chamber (12) via the first oil hole and the second oil hole; the servo electromagnetic control valve (80) is used to control the size of the valve opening when the piston (30) moves along the cylinder body (10) to adjust the oil flow between the first damping chamber (11) and the second damping chamber (12) to adjust the damping force.

2. The damper for steplessly regulating damping force according to claim 1, characterized in that: There are two first oil holes and two second oil holes, the two first oil holes are symmetrically opened along the radial direction of the oil cylinder body (10), and the two second oil holes are symmetrically opened along the radial direction of the oil cylinder body (10); there are two servo electromagnetic control valves (80) and they are symmetrically arranged along the radial direction of the oil cylinder body (10); The two oil ports of each servo electromagnetic control valve (80) are respectively connected to the corresponding first oil hole and the second oil hole through a first high-pressure oil pipe (81) and a second high-pressure oil pipe (82).

3. The damper for steplessly regulating damping force according to claim 1, characterized in that: The first oil hole and the second oil hole are opened close to the inner side walls of the two cylinder covers (20).

4. The damper for steplessly regulating damping force according to claim 1, characterized in that: The inner wall of the sliding hole of the cylinder cover (20) is provided with a plurality of first annular sealing grooves, and a first sealing ring (90) is arranged in each of the first annular sealing grooves to slide and seal the outer wall of the piston rod (40) with the inner wall of the sliding hole.

5. The damper for steplessly regulating damping force according to claim 1, characterized in that: A plurality of second annular sealing grooves are formed on the outer peripheral side wall of the piston (30), and a second sealing ring (100) is arranged in each of the second annular sealing grooves to slidingly seal the outer peripheral side wall of the piston (30) and the inner side wall of the cylinder body (10).

6. The damper for steplessly regulating damping force according to claim 1, characterized in that: The connecting body (60) is a cylindrical structure with one end closed and the other end open. The open end of the connecting body (60) is connected to one end of the cylinder body (10) through a threaded structure and closes the second end of the piston rod (40).

7. The damper for steplessly regulating damping force according to claim 1, characterized in that: The first connecting ear plate (50) and the second connecting ear plate (70) are both provided with connecting holes, and joint bearings (110) are arranged in the connecting holes.

8. A damping system for steplessly regulating damping force, characterized in that: include: A vibration signal sensor (120) is arranged on the civil engineering structure, and the vibration signal sensor (120) is used to monitor the acceleration signal or displacement signal of the civil engineering structure; A controller (130), the controller (130) being connected to the vibration signal sensor (120) and receiving an acceleration signal or a displacement signal monitored by the vibration signal sensor (120); A damper (140), wherein the damper (140) is the damper according to any one of claims 1 to 7, and the servo electromagnetic control valve (80) of the damper (140) is connected to the controller (130); The controller (130) is used to send a control signal to the servo electromagnetic control valve (80) according to the received acceleration signal or displacement signal to control the valve opening size of the servo electromagnetic control valve (80) to adjust the oil flow between the first damping chamber (11) and the second damping chamber (12) to adjust the damping force of the damper (140).

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