Three-way wide-band and large-load vibration reduction device based on adjustable frequency vibration absorption and active vibration isolation

Abstract

The present invention proposes a three-way wide-band and large-load vibration reduction device based on adjustable frequency vibration absorption and active vibration isolation, including an active vibration isolation device supported on the lower end surface of a base, and also including a vibration absorption device connected to the side surface of the base; the active vibration isolation device is a piston-type magnetorheological active vibration isolation device, and its piston performs damped up and down motion in a working cylinder storing magnetorheological fluid to dissipate the vibration energy of external mechanical equipment. The controller of the active vibration isolation device uses an acceleration sensor to analyze the vibration signal of the mechanical equipment in real time, and changes the damping characteristics of the magnetorheological fluid by changing the magnetic field characteristics of the excitation coil to adjust the vibration isolation characteristics of the active vibration isolation device; the vibration absorption device vibration reduction frequency band is adjusted by adjusting the elastic characteristics of the elastic part or increasing or decreasing the number of mass parts; the present invention has the characteristics of wide-band and multi-directional vibration reduction controllable, and can better solve the vibration noise problem generated by mechanical equipment during operation.

Description

Technical Field

[0001] The invention relates to the technical field of equipment vibration reduction, in particular to a three-way wide-band and large-load vibration reduction device based on adjustable-frequency vibration absorption and active vibration isolation. Background Art

[0002] Vibration is widely present in industrial production. For example, rotating machinery such as prime movers, compressors, pumps, hydraulic motors, etc. will generate vibration during operation due to reasons such as rotor imbalance. Vibration will harm mechanical equipment, reduce its working efficiency, shorten its service life, and in severe cases, cause production accidents and affect production safety. In addition, vibration will also cause noise problems, affecting the physical and mental health of workers.

[0003] Most of the existing vibration reduction devices are passive vibration isolation devices, with single performance and narrow adaptability. They can only work on vibrations in a certain frequency band and direction, and the vibration reduction effect is poor. In addition, the vibration mechanism of some industrial machinery and equipment is relatively complex, and there are multiple vibration superpositions, which leads to the vibration reduction effect of a single ordinary vibration reduction device failing to meet the expected requirements. It is necessary to find a vibration reduction device with better performance, wider applicability and more obvious effect.

[0004] Magnetorheological fluid is a new type of intelligent material. It will produce obvious magnetorheological effect under the action of external magnetic field. It can change the viscosity of the liquid itself in a very short time and realize rapid conversion between solid and liquid states. Magnetorheological fluid has fast response, good reversibility, and can realize continuous change of mechanical properties by adjusting the size of magnetic field. Based on the characteristics of magnetorheological fluid, an active control vibration isolation device can be designed. The damping, stiffness and other characteristics can be adjusted in real time according to the vibration of the equipment to be isolated to achieve active vibration isolation. The dynamic vibration absorber is a device that absorbs the energy of the vibrating object through the resonance effect to achieve the purpose of vibration reduction. It has the advantages of simple structure, convenient manufacturing and good vibration absorption effect. Summary of the invention

[0005] The present invention proposes a three-way wide-band and large-load vibration reduction device based on adjustable frequency vibration absorption and active vibration isolation, which has the characteristics of wide-band and multi-directional controllable vibration reduction and can better solve the vibration and noise problems generated by mechanical equipment during operation.

[0006] A three-way wideband, high-load vibration reduction device based on adjustable frequency vibration absorption and active vibration isolation, with a base placed below an external mechanical device, the vibration reduction device comprising an active vibration isolation device supported on the lower end surface of the base (4), and also comprising a vibration absorption device connected to the side surface of the base;

[0007] The active vibration isolation device is a piston-type magnetorheological active vibration isolation device, whose piston moves up and down with damping in a working cylinder containing magnetorheological fluid to dissipate the vibration energy of the external mechanical equipment. The controller of the active vibration isolation device uses an acceleration sensor to analyze the vibration signal of the mechanical equipment in real time, and changes the damping characteristics of the magnetorheological fluid by changing the magnetic field characteristics of the excitation coil, thereby adjusting the vibration isolation characteristics of the active vibration isolation device.

[0008] The vibration absorbing device includes a plate-shaped elastic member, one end of which is connected to the side of the base, and the other end of which suspends a mass member to form an anti-resonance system for vibration reduction. The vibration reduction frequency band of the vibration absorbing device is adjusted by adjusting the elastic characteristics of the elastic member or increasing or decreasing the number of mass members.

[0009] The three-way wide-band and large-load vibration reduction device is arranged at multiple points below the mechanical equipment. When working, it is connected to the external mechanical equipment by a connecting plate (5) arranged on the base (4), and supported on the mounting surface by the base (1); the acceleration sensor (21) is arranged on the base, the controller (16) is arranged on the base, a preload spring (19) capable of forming a preload is arranged between the bases, a supporting boss (20) for supporting the connecting plate is arranged in the center of the upper end surface of the base; and a connecting boss (18) for connecting the piston rod of the working cylinder piston is arranged at the lower end surface of the base;

[0010] When the excitation coil is not energized, the magnetorheological fluid damping of the working cylinder is at a low value, and the base provides support force to the base with a preload spring. When the piston moves upward, the preload spring provides a restoring force to assist its movement. The base and the base are both provided with a positioning boss (22) for connecting and positioning the preload spring.

[0011] The connection plate is provided with a large through hole (8), a small through hole (6) and a connection hole (7) for connecting mechanical equipment.

[0012] The working cylinder of the active vibration isolation device comprises a plurality of piston cylinders (3) containing magnetorheological fluid (26) disposed between a base (1) and a pedestal (4); the piston cylinder is provided with a piston rod (23) connected to a piston (33) and extending from a cylinder cover (17); the piston cylinder is disposed in an excitation coil (2); and the magnetic field of the excitation coil can act on the magnetorheological fluid in the piston cylinder to change its damping characteristics.

[0013] A circulation valve (32), a compensation valve (34), an extension valve (27), and a compression valve (25) are arranged in the piston cylinder; the lower chamber of the piston cylinder is connected to the liquid storage cylinder below the piston cylinder via the compensation valve and the compression valve; the extension valve and the circulation valve are arranged at the piston for circulation of the magnetorheological fluid; the valve of the extension valve faces downward, and a valve spring (28) at the upper end of the valve forms a pressing force and a restoring force; the valve of the circulation valve faces upward, and a valve spring at the lower end of the valve forms a pressing force and a restoring force; the cylinder cover of the piston cylinder forms a sealing structure with a large sealing ring (29) and a small sealing ring (30);

[0014] During the operation of the piston-type magnetorheological active vibration isolation device, when the piston moves downward, the volume of the lower chamber of the piston cylinder decreases, and the volume of the upper chamber increases. The pressure in the lower chamber is higher than that in the upper chamber. The liquid in the lower chamber of the piston cylinder pushes open the circulation valve and enters the upper chamber of the piston cylinder. Since the piston rod occupies part of the volume of the upper chamber of the piston cylinder, the increased volume of the upper chamber of the piston cylinder is less than the reduced volume of the lower chamber. The excess liquid in the lower chamber enters the liquid storage cylinder (35) from the compression valve. When the piston moves upward, the volume of the upper chamber of the piston cylinder decreases, and the volume of the lower chamber increases. The pressure in the upper chamber of the piston cylinder is higher than that in the lower chamber. The liquid in the upper chamber of the piston cylinder pushes open the extension valve and flows into the lower chamber. The occupation of the volume of the upper chamber of the piston cylinder by the piston rod generates a vacuum in the lower chamber. Under the action of the vacuum suction, the liquid in the liquid storage cylinder pushes open the compensation valve and flows back to the lower chamber of the piston cylinder.

[0015] The excitation coil is wound around the outer wall of the piston cylinder and connected to the controller; the acceleration sensor is installed on the base through fasteners to obtain the vibration signal of the mechanical equipment in real time, and the controller receives the vibration signal of the mechanical equipment fed back by the acceleration sensor in real time for analysis and processing, and issues a control instruction to adjust the current in the excitation coil to adjust the magnetic field characteristics generated by the excitation coil, thereby changing the damping characteristics of the magnetorheological fluid; the controller is provided with a power supply interface for connecting an external power supply.

[0016] The elastic member of the vibration absorbing device comprises a spring sheet (10) and a spring sheet fixing plate (9); the mass member comprises a mass block plate (12) and a mass block (13) connected and fixed thereto;

[0017] The spring sheet is provided with an adjustment slot (11), wherein the adjustment slot can adjust the effective elastic length of the spring sheet through a fastener; one end of the spring sheet is pressed and mounted on the base through a fastener and a spring sheet fixing plate, and the other end is connected to the mass member through the fastener on the adjustment slot so that the mass member is in a suspended state; when the effective working length of the spring sheet changes, the elastic force characteristics of the elastic member change accordingly, thereby changing the stiffness of the vibration absorbing device;

[0018] The upper end of the mass block plate of the mass member is provided with a mounting lug (24) for connecting to a fastener at the adjustment slot, and the mass of the vibration absorbing device is adjusted by increasing or decreasing the number of mass blocks.

[0019] The beneficial effects of the present invention are that active vibration isolation of mechanical equipment is achieved by designing a piston-type magnetorheological active vibration isolation device, and controllable, adjustable, wide-band, and multi-directional vibration reduction characteristics are achieved by means of the variable damping characteristics of the magnetorheological fluid. At the same time, by designing a spring sheet-mass block vibration absorption device with adjustable stiffness and damping, targeted vibration reduction can be performed on a frequency band of severe vibration of the mechanical equipment, thereby solving the problem of equipment vibration superposition and greatly improving the overall vibration reduction effect of the vibration reduction device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0021] Attached Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0022] Attached Figure 2 It is a left side schematic diagram of the present invention;

[0023] Attached Figure 3 It is a right side schematic diagram of the present invention;

[0024] Attached Figure 4 is a cross-sectional view of the present invention;

[0025] Attached Figure 5 It is a schematic diagram of the piston structure;

[0026] Attached Figure 6 It is the installation schematic diagram of the present invention;

[0027] Attached Figure 7 is another installation schematic diagram of the present invention;

[0028] In the figure: 1-base, 2-excitation coil, 3-piston cylinder, 4-base, 5-connecting plate, 6-small through hole, 7-connecting hole, 8-large through hole, 9-spring sheet fixing plate, 10-spring sheet, 11-adjusting groove, 12-mass block plate, 13-mass block, 14-mounting hole, 15-power interface, 16-controller, 17-cylinder cover, 18-connecting boss, 19-preload spring, 20-support boss, 21-acceleration sensor, 22-positioning boss, 23-piston rod, 24-mounting ear, 25-compression valve, 26-magnetorheological fluid, 27-extension valve, 28-valve spring, 29-large sealing ring, 30-small sealing ring, 31-working cylinder, 32-circulation valve, 33-piston, 34-compensation valve, 35-liquid storage cylinder. DETAILED DESCRIPTION

[0029] As shown in the figure, a three-way wide-band and large-load vibration reduction device based on adjustable frequency vibration absorption and active vibration isolation is placed under the external mechanical equipment with a base. The vibration reduction device includes an active vibration isolation device supported on the lower end surface of the base 4, and also includes a vibration absorption device connected to the side of the base;

[0030] The active vibration isolation device is a piston-type magnetorheological active vibration isolation device, wherein the piston 33 thereof performs damped up-and-down motion in the working cylinder 31 storing the magnetorheological fluid 26, thereby dissipating the vibration energy of the external mechanical equipment. The controller of the active vibration isolation device uses an acceleration sensor to analyze the vibration signal of the mechanical equipment in real time, and changes the damping characteristics of the magnetorheological fluid by changing the magnetic field characteristics of the excitation coil 2, thereby adjusting the vibration isolation characteristics of the active vibration isolation device.

[0031] The vibration absorbing device includes a plate-shaped elastic member, one end of which is connected to the side of the base, and the other end of which suspends a mass member to form an anti-resonance system for vibration reduction. The vibration reduction frequency band of the vibration absorbing device is adjusted by adjusting the elastic characteristics of the elastic member or increasing or decreasing the number of mass members.

[0032] The three-way broadband large-load vibration reduction device is arranged at multiple points below the mechanical equipment. When working, it is connected to the external mechanical equipment by the connecting plate 5 arranged on the base 4, and supported on the mounting surface by the base 1; the acceleration sensor 21 is arranged at the base, the controller 16 is arranged on the base, a preload spring 19 that can form a preload is arranged between the bases, and a supporting boss 20 for supporting the connecting plate is arranged in the center of the upper end surface of the base; a connecting boss 18 for connecting the piston rod of the working cylinder piston is arranged at the lower end surface of the base;

[0033] When the excitation coil is not energized, the magnetorheological fluid damping of the working cylinder is at a low value, and the base provides support force to the base with a preload spring. When the piston moves upward, the preload spring provides a restoring force to assist its movement. The base and the base are both provided with a positioning boss 22 for connecting and positioning the preload spring;

[0034] The connection plate is provided with a large through hole 8, a small through hole 6 and a connection hole 7 for connecting mechanical equipment.

[0035] The working cylinder of the active vibration isolation device includes a plurality of piston cylinders 3 containing magnetorheological fluid 26 placed between a base 1 and a pedestal 4; the piston cylinder is provided with a piston rod 23 connected to a piston 33 and extending from a cylinder cover 17; the piston cylinder is arranged in an excitation coil 2; the magnetic field of the excitation coil can act on the magnetorheological fluid in the piston cylinder to change its damping characteristics.

[0036] A circulation valve 32, a compensation valve 34, an extension valve 27, and a compression valve 25 are arranged in the piston cylinder; the lower chamber of the piston cylinder is connected to the liquid storage cylinder below the piston cylinder through the compensation valve and the compression valve; the extension valve and the circulation valve are arranged at the piston for the circulation of the magnetorheological fluid; the valve of the extension valve faces downward, and the valve spring 28 at the upper end of the valve forms a pressing force and a restoring force, and the valve of the circulation valve faces upward, and the valve spring at the lower end of the valve forms a pressing force and a restoring force; the cylinder cover of the piston cylinder forms a sealing structure with a large sealing ring 29 and a small sealing ring 30;

[0037] During the operation of the piston-type magnetorheological active vibration isolation device, when the piston moves downward, the volume of the lower chamber of the piston cylinder decreases, and the volume of the upper chamber increases. The pressure in the lower chamber is higher than that in the upper chamber. The liquid in the lower chamber of the piston cylinder pushes open the circulation valve and enters the upper chamber of the piston cylinder. Since the piston rod occupies part of the volume of the upper chamber of the piston cylinder, the increased volume of the upper chamber of the piston cylinder is less than the reduced volume of the lower chamber. The excess liquid in the lower chamber enters the liquid storage cylinder 35 from the compression valve; when the piston moves upward, the volume of the upper chamber of the piston cylinder decreases, and the volume of the lower chamber increases. The pressure in the upper chamber of the piston cylinder is higher than that in the lower chamber. The liquid in the upper chamber of the piston cylinder pushes open the extension valve and flows into the lower chamber. The occupation of the volume of the upper chamber of the piston cylinder by the piston rod creates a vacuum in the lower chamber. Under the action of the vacuum suction, the liquid in the liquid storage cylinder pushes open the compensation valve and flows back to the lower chamber of the piston cylinder.

[0038] The excitation coil is wound around the outer wall of the piston cylinder and connected to the controller; the acceleration sensor is installed on the base through fasteners to obtain the vibration signal of the mechanical equipment in real time, and the controller receives the vibration signal of the mechanical equipment fed back by the acceleration sensor in real time for analysis and processing, and issues a control instruction to adjust the current in the excitation coil to adjust the magnetic field characteristics generated by the excitation coil, thereby changing the damping characteristics of the magnetorheological fluid; the controller is provided with a power supply interface 15 for connecting an external power supply.

[0039] The elastic member of the vibration absorbing device includes a spring sheet 10 and a spring sheet fixing plate 9; the mass member includes a mass block plate 12 and a mass block 13 connected and fixed thereto;

[0040] The spring sheet is provided with an adjustment slot 11, and the adjustment slot can adjust the effective elastic length of the spring sheet through a fastener. One end of the spring sheet is pressed and installed on the base through a fastener and a spring sheet fixing plate, and the other end is connected to the mass member through the fastener on the adjustment slot so that the mass member is in a suspended state. When the effective working length of the spring sheet changes, the elastic force characteristics of the elastic member change accordingly, so that the stiffness of the vibration absorbing device changes;

[0041] The upper end of the mass block plate of the mass member is provided with a mounting lug 24 for connecting the fastener at the adjustment slot. The mass of the vibration absorbing device is adjusted by increasing or decreasing the number of mass blocks.

[0042] Example:

[0043] During operation, several vibration reduction devices are connected to the mechanical equipment through the connecting plate 5, the acceleration sensor 21 obtains the vibration of the mechanical equipment in real time, and transmits the vibration signal to the controller 16 for analysis and processing, the controller 16 outputs a control instruction to adjust the current in the excitation coil 2, thereby adjusting the magnetic field characteristics generated by the excitation coil 2, and then changing the damping characteristics of the magnetorheological fluid 26, the piston 33 makes a damped up and down movement in the piston cylinder 3, thereby dissipating the vibration energy, the variable damping characteristics of the magnetorheological fluid 26 enables the piston-type vibration isolation device to achieve controllable and adjustable active vibration isolation, and at the same time the spring sheet-mass block vibration absorption device forms an anti-resonance system to absorb part of the vibration energy, and because the effective working length of the spring sheet 10 is adjustable and the number of mass blocks 13 can be increased or decreased, the characteristics of the adjustable stiffness and damping of the vibration absorption device can be targeted at strengthening the vibration reduction in a certain frequency band of the mechanical equipment with severe vibration, solve the vibration superposition problem of the equipment, and greatly enhance the overall vibration reduction effect of the vibration reduction device.

[0044] Among them, during the operation of the piston-type magnetorheological active vibration isolation device, when the piston 33 moves downward, the volume of the lower chamber of the piston decreases, the volume of the upper chamber increases, the pressure in the lower chamber is higher than that in the upper chamber, the liquid presses open the circulation valve 32 and enters the upper chamber, and because the piston rod 23 occupies a part of the volume, the increased volume of the upper chamber is less than the reduced volume of the lower chamber, and the excess liquid in the lower chamber enters the oil storage cylinder from the compression valve 25; when the piston 33 moves upward, the volume of the upper chamber of the piston decreases, the volume of the lower chamber increases, the pressure in the upper chamber is higher than that in the lower chamber, the liquid pushes open the extension valve 27 and flows into the lower chamber, and due to the existence of the piston rod 23, a certain vacuum degree is generated in the lower chamber, and the liquid in the oil storage cylinder opens the compensation valve 34 under the action of the vacuum suction and flows back to the lower chamber.

[0045] In this example, in the three-way broadband large-load vibration reduction device based on adjustable frequency vibration absorption and active vibration isolation, the active vibration isolation device on the lower end surface of the base 4 is used to isolate the vertical vibration of the equipment, that is, the vibration isolation in the Z-axis direction, and the vibration absorption device connected to the side of the base is used to absorb the horizontal vibration of the equipment. The extension direction of its elastic member is the vibration absorption direction. The horizontal vibration absorption direction can be adjusted by changing the extension direction of the elastic member when installing the three-way broadband large-load vibration reduction device.

[0046] The preferred embodiments listed above further illustrate the objectives, technical solutions and advantages of the present invention in detail. It should be understood that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A three-way wideband and large-load vibration reduction device based on adjustable frequency vibration absorption and active vibration isolation is placed under the external mechanical equipment with a base, characterized by: The vibration reduction device comprises an active vibration isolation device supported on the lower end surface of the base (4), and also comprises a vibration absorption device connected to the side surface of the base; The active vibration isolation device is a piston-type magnetorheological active vibration isolation device, whose piston moves up and down with damping in a working cylinder containing magnetorheological fluid to dissipate the vibration energy of the external mechanical equipment. The controller of the active vibration isolation device uses an acceleration sensor to analyze the vibration signal of the mechanical equipment in real time, and changes the damping characteristics of the magnetorheological fluid by changing the magnetic field characteristics of the excitation coil, thereby adjusting the vibration isolation characteristics of the active vibration isolation device. The vibration absorbing device comprises a plate-shaped elastic member, one end of which is connected to the side of the base, and the other end of which suspends a mass member to form an anti-resonance system for vibration reduction. The vibration reduction frequency band of the vibration absorbing device is adjusted by adjusting the elastic force characteristics of the elastic member or increasing or decreasing the number of mass members. The three-way wide-band and large-load vibration reduction device is arranged at multiple points below the mechanical equipment. When working, it is connected to the external mechanical equipment by a connecting plate (5) arranged on the base (4), and supported on the mounting surface by the base (1); the acceleration sensor (21) is arranged on the base, the controller (16) is arranged on the base, a preload spring (19) capable of forming a preload is arranged between the bases, a supporting boss (20) for supporting the connecting plate is arranged in the center of the upper end surface of the base; and a connecting boss (18) for connecting the piston rod of the working cylinder piston is arranged at the lower end surface of the base; When the excitation coil is not energized, the magnetorheological fluid damping of the working cylinder is at a low value, and the base provides support force to the base with a preload spring. When the piston moves upward, the preload spring provides a restoring force to assist its movement. The base and the base are both provided with a positioning boss (22) for connecting and positioning the preload spring. The connecting plate is provided with a large through hole (8), a small through hole (6) and a connecting hole (7) for connecting to mechanical equipment; The working cylinder of the active vibration isolation device comprises a plurality of piston cylinders (3) containing magnetorheological fluid (26) disposed between a base (1) and a pedestal (4); the piston cylinder is provided with a piston rod (23) connected to a piston (33) and extending from a cylinder cover (17); the piston cylinder is disposed in an excitation coil (2); the magnetic field of the excitation coil can act on the magnetorheological fluid in the piston cylinder to change its damping characteristics; The excitation coil is wound around the outer wall of the piston cylinder and connected to the controller; the acceleration sensor is installed on the base through a fastener to obtain the vibration signal of the mechanical equipment in real time, and the controller receives the vibration signal of the mechanical equipment fed back by the acceleration sensor in real time for analysis and processing, and issues a control instruction to adjust the current in the excitation coil to adjust the magnetic field characteristics generated by the excitation coil, thereby changing the damping characteristics of the magnetorheological fluid; the controller is provided with a power supply interface for connecting an external power supply; The elastic member of the vibration absorbing device comprises a spring sheet (10) and a spring sheet fixing plate (9); the mass member comprises a mass block plate (12) and a mass block (13) connected and fixed thereto; The spring sheet is provided with an adjustment slot (11), wherein the adjustment slot can adjust the effective elastic length of the spring sheet through a fastener; one end of the spring sheet is pressed and mounted on the base through a fastener and a spring sheet fixing plate, and the other end is connected to the mass member through the fastener on the adjustment slot so that the mass member is in a suspended state; when the effective working length of the spring sheet changes, the elastic force characteristics of the elastic member change accordingly, thereby changing the stiffness of the vibration absorbing device; The vibration absorbing device connected to the side of the base is used to absorb the horizontal vibration of the equipment. The extension direction of the elastic part is the vibration absorbing direction. When installing the three-way broadband and large-load vibration reduction device, the horizontal vibration absorbing direction is adjusted by changing the extension direction of the elastic part.

2. The three-way wideband large-load vibration reduction device based on adjustable frequency vibration absorption and active vibration isolation according to claim 1 is characterized in that: A circulation valve (32), a compensation valve (34), an extension valve (27), and a compression valve (25) are arranged in the piston cylinder; the lower chamber of the piston cylinder is connected to the liquid storage cylinder below the piston cylinder via the compensation valve and the compression valve; the extension valve and the circulation valve are arranged at the piston for circulation of the magnetorheological fluid; the valve of the extension valve faces downward, and a valve spring (28) at the upper end of the valve forms a pressing force and a restoring force; the valve of the circulation valve faces upward, and a valve spring at the lower end of the valve forms a pressing force and a restoring force; the cylinder cover of the piston cylinder forms a sealing structure with a large sealing ring (29) and a small sealing ring (30); During the operation of the piston-type magnetorheological active vibration isolation device, when the piston moves downward, the volume of the lower chamber of the piston cylinder decreases, and the volume of the upper chamber increases. The pressure in the lower chamber is higher than that in the upper chamber. The liquid in the lower chamber of the piston cylinder pushes open the circulation valve and enters the upper chamber of the piston cylinder. Since the piston rod occupies part of the volume of the upper chamber of the piston cylinder, the increased volume of the upper chamber of the piston cylinder is less than the reduced volume of the lower chamber. The excess liquid in the lower chamber enters the liquid storage cylinder (35) from the compression valve. When the piston moves upward, the volume of the upper chamber of the piston cylinder decreases, and the volume of the lower chamber increases. The pressure in the upper chamber of the piston cylinder is higher than that in the lower chamber. The liquid in the upper chamber of the piston cylinder pushes open the extension valve and flows into the lower chamber. The occupation of the volume of the upper chamber of the piston cylinder by the piston rod generates a vacuum in the lower chamber. Under the action of the vacuum suction, the liquid in the liquid storage cylinder pushes open the compensation valve and flows back to the lower chamber of the piston cylinder.

3. The three-way wideband large-load vibration reduction device based on adjustable frequency vibration absorption and active vibration isolation according to claim 1 is characterized in that: The upper end of the mass block plate of the mass member is provided with a mounting lug (24) for connecting to a fastener at the adjustment slot, and the mass of the vibration absorbing device is adjusted by increasing or decreasing the number of mass blocks.

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