An active quasi-zero stiffness vibration isolator based on electromagnetic actuator

Abstract

The present invention provides an active quasi-zero stiffness vibration isolator based on an electromagnetic actuator, and relates to the technical field of vibration reduction and vibration isolation of engineering structures. The scheme includes a spring sleeve, a connecting tube, and an electromagnetic actuator, wherein the electromagnetic actuator is fixedly connected to the spring sleeve through the connecting tube, a slider is arranged in the spring sleeve, a plurality of inclined springs are connected between the slider and the inner wall of the spring sleeve, an intermediate stabilizing rod is fixedly arranged at the end of the electromagnetic actuator mover of the electromagnetic actuator, and an axial spring is arranged on the outer wall of the intermediate stabilizing rod between the slider and the cover plate. By setting an electromagnetic actuator that can be actively adjusted, the invention makes full use of the advantages of quasi-zero stiffness technology and active control to enable the device to have excellent vibration isolation effect in the entire frequency band. When the vibration is transmitted from the vibration isolation object to the vibration-isolated object, the vibration of the vibration isolation object is actively controlled by the electromagnetic actuator using active control technology.

Description

Technical Field

[0001] The invention relates to the technical field of vibration reduction and isolation of engineering structures, and in particular to an active quasi-zero stiffness vibration isolator based on an electromagnetic actuator. Background Art

[0002] With the rapid development of science and technology, precision instruments and equipment have entered the era of ultra-precision and have been widely used in the production and manufacturing of microelectronics, semiconductors, optics and other devices. Studies have shown that vibration has become one of the key factors restricting the normal operation of precision instruments and equipment, so vibration reduction and isolation of precision instruments and equipment are particularly important.

[0003] Generally speaking, the vibration isolation starting frequency and transmissibility are two important parameters for evaluating vibration isolation performance. A vibration isolation system with excellent performance should have a lower vibration isolation starting frequency and a lower transmissibility to obtain a wider vibration isolation frequency band and reduce the harm of vibration. The parameters that affect the main performance of the vibration isolation system are the natural frequency and the damping ratio. If a vibration isolation system with a smaller stiffness is selected, its natural frequency will be reduced, thereby reducing the vibration isolation starting frequency and widening the vibration isolation frequency band. However, its carrying capacity will decrease and the static displacement will increase. If the system damping is increased, the vibration transmissibility of the vibration isolation system at the resonance frequency point will decrease, but its vibration transmissibility at high frequencies will increase.

[0004] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0005] The purpose of the present invention is to provide an active quasi-zero stiffness vibration isolator based on an electromagnetic actuator. The present invention aims to solve the technical problems of poor vibration isolation effect in the low-frequency band and narrow vibration isolation frequency band of the existing vibration isolation scheme, so as to alleviate the contradiction between the low vibration isolation starting frequency and the high static bearing capacity in the traditional linear vibration isolation system. At the same time, it has higher static stiffness and lower dynamic stiffness, thereby ensuring that the system has a small natural frequency on the basis of a certain bearing capacity, and can significantly expand the vibration isolation frequency band of the system, improve the vibration isolation efficiency of the system, and at the same time can isolate the technical problem of low-frequency vibration.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention provides an active quasi-zero stiffness vibration isolator based on an electromagnetic actuator, comprising a spring sleeve, a connecting tube and an electromagnetic actuator, wherein the electromagnetic actuator is fixedly connected to the spring sleeve through the connecting tube;

[0008] A slider is arranged in the spring sleeve, a plurality of inclined springs are connected between the slider and the inner wall of the spring sleeve, and the inclined springs are evenly distributed in the spring sleeve, an intermediate stabilizing rod is fixedly arranged at the end of the electromagnetic actuator mover of the electromagnetic actuator, the intermediate stabilizing rod is fixedly connected to the slider, the spring sleeve is fixedly connected to a cover plate through an external sleeve, and an axial spring is arranged on the outer wall of the intermediate stabilizing rod between the slider and the cover plate;

[0009] One or more active quasi-zero stiffness vibration isolators based on electromagnetic actuators are installed between the vibration isolation object and the object to be isolated, and the magnitude of the electromagnetic force is changed by changing the magnitude of the current flowing through the coil in the electromagnetic actuator to control the vibration of the vibration isolation object.

[0010] On the basis of the above scheme, further, the electromagnetic actuator includes an electromagnetic actuator mover and an electromagnetic actuator stator, the electromagnetic actuator mover is arranged in the electromagnetic actuator stator, the electromagnetic actuator mover includes a winding tube and a coil, the number of the coils is two, and both are set on the outer top wall of the winding tube, the coils are electrically connected with leads, and the outer wall of the winding tube is fixedly connected to the intermediate stabilizing rod by bolts; the electromagnetic actuator stator includes a magnetic steel outer tube, a permanent magnet and a soft iron, a linear bearing is fixedly arranged at the center of the magnetic steel outer tube, and the linear bearing connecting rod is fixedly connected to the inner top wall of the winding tube, the permanent magnet and the soft iron each include a plurality of groups, which are arranged on the outer wall of the linear bearing at intervals along the axial direction, and the adjacent magnetic poles of the permanent magnet are kept the same, and different electromagnetic forces can be generated on the electromagnetic actuator mover by changing the current size of the coil in the electromagnetic actuator, and the electromagnetic actuator mover is actuated along the axial direction of the vibration isolator, and the vibration of the vibration isolation object can be controlled in real time by transmitting the force to the intermediate stabilizing rod.

[0011] It should be added that the coil in the electromagnetic actuator adopts a single-layer coil or a multi-layer coil according to different actuating force requirements, and the permanent magnet and the soft iron in the stator of the electromagnetic actuator are adjusted corresponding to the coil specifications.

[0012] On the basis of the above scheme, further, the number of the inclined springs is at least two, and the static bearing capacity of the system can be further improved by changing the number of inclined springs in the quasi-zero stiffness system, so that the vibration isolation object has a larger mass variation range.

[0013] It should be supplemented that hinge supports are provided at both ends of the inclined spring, a plurality of groups of U-shaped protrusions are fixedly provided on the inner wall of the spring sleeve, and U-shaped protrusions are fixedly provided on the outer wall of the slider at positions opposite to the U-shaped protrusions on the inner wall of the spring sleeve, and the hinge supports on the inclined spring are respectively hinged to the corresponding U-shaped protrusions, and the design of the U-shaped protrusions and the hinge supports facilitates the installation and use of the inclined spring.

[0014] On the basis of the above solution, further, the intermediate stabilizing rod and the sliding block are fixedly connected by bolts, so that the intermediate stabilizing rod and the sliding block can move synchronously with the mover of the electromagnetic actuator.

[0015] On the basis of the above scheme, further, a through hole is opened on the cover plate, and the end of the intermediate stabilizing rod passes through the through hole and is arranged outside the cover plate, so as to facilitate the connection of the end of the intermediate stabilizing rod with the seismic isolation object and facilitate the normal operation of the device.

[0016] On the basis of the above solution, further, the outer sleeve is divided into three parts: upper, middle and lower, and adjacent parts are connected by bolts.

[0017] On the basis of the above solution, further, the intermediate stabilizing rod is fixedly connected to the sliding block by bolts, which is convenient for disassembly during maintenance.

[0018] The beneficial effects of the present invention are:

[0019] The present invention provides an active quasi-zero stiffness vibration isolator based on an electromagnetic actuator, which can achieve the following effects:

[0020] 1. By setting an electromagnetic actuator that can be actively adjusted, the advantages of quasi-zero stiffness technology and active control are fully utilized to enable the device to have excellent vibration isolation effect in the entire frequency band. When the vibration is transmitted from the vibration isolation object to the object to be isolated, the vibration of the vibration isolation object is actively controlled by the electromagnetic actuator using active control technology;

[0021] 2. In the vibration isolation process, the stiffness of the axial spring and the inclined spring in the zero stiffness system is designed according to the mass of the vibration isolation object, so that the vibration isolation object maintains a quasi-zero stiffness state after being installed on the device, that is, in the static state, the inclined spring just reaches a horizontal position after the vibration isolation object is installed. In the small amplitude vibration state at this position, the stiffness of the zero stiffness system approaches zero, which can ensure that the vibration isolation object has a small dynamic stiffness;

[0022] 3. Under the feedback signals of the displacement sensor, velocity sensor and acceleration sensor, the current of the coil in the electromagnetic actuator is changed, thereby generating different electromagnetic forces acting on the electromagnetic actuator mover, and the electromagnetic actuator mover transmits the force to the intermediate stabilizing bar, and the vibration of the vibration isolation object is controlled in real time through the intermediate stabilizing bar, thereby improving the vibration isolation efficiency of the device;

[0023] 4. From the perspective of traditional linear vibration isolation theory, this device improves the vibration isolation frequency band. From the perspective of active vibration control, it fully utilizes the advantages of active control technology in the low frequency band to suppress the low-frequency resonance peak. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a side view of the internal structure of an active quasi-zero stiffness vibration isolator based on an electromagnetic actuator in a horizontal state provided by an embodiment of the present invention;

[0026] Figure 2 It is a front view of the internal structure of an active quasi-zero stiffness vibration isolator based on an electromagnetic actuator in a horizontal state provided by an embodiment of the present invention;

[0027] Figure 3 It is a top view of the internal structure of an active quasi-zero stiffness vibration isolator based on an electromagnetic actuator in a horizontal state provided by an embodiment of the present invention;

[0028] Figure 4 This is a horizontal state internal structure visual axis view of an active quasi-zero stiffness vibration isolator based on an electromagnetic actuator provided by an embodiment of the present invention;

[0029] Figure 5 It is a side view of the external structure of an active quasi-zero stiffness vibration isolator based on an electromagnetic actuator provided by an embodiment of the present invention;

[0030] Figure 6 It is a front view of the external structure of an active quasi-zero stiffness vibration isolator based on an electromagnetic actuator provided by an embodiment of the present invention;

[0031] Figure 7 It is a top view of the external structure of an active quasi-zero stiffness vibration isolator based on an electromagnetic actuator provided by an embodiment of the present invention;

[0032] Figure 8This is an axial view of the external structure of an active quasi-zero stiffness vibration isolator based on an electromagnetic actuator provided by an embodiment of the present invention;

[0033] Fig. 9 is a cross-sectional view of an active quasi-zero stiffness vibration isolator based on an electromagnetic actuator provided by an embodiment of the present invention in a side view;

[0034] Fig.10 It is a side view of the internal structure of an active quasi-zero stiffness vibration isolator electromagnetic actuator based on an electromagnetic actuator provided by an embodiment of the present invention;

[0035] Fig.11 It is a top view of an active quasi-zero stiffness vibration isolator electromagnetic actuator based on an electromagnetic actuator provided by an embodiment of the present invention;

[0036] Fig.12 The present invention provides an active quasi-zero stiffness vibration isolator electromagnetic actuator axial view based on an electromagnetic actuator.

[0037] Reference numerals:

[0038] 1. Spring sleeve; 2. Connecting cylinder; 3. Electromagnetic actuator; 4. Intermediate stabilizing rod; 5. Hinge support; 6. Inclined spring; 7. Slider; 8. External sleeve; 9. Cover plate; 10. Lead wire; 11. Electromagnetic actuator mover; 12. Electromagnetic actuator stator; 13. Winding cylinder; 14. Coil; 15. Magnetic steel outer cylinder; 16. Permanent magnet; 17. Soft iron; 18. Linear bearing; 19. Axial spring. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the terms “first” and “second” are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Example 1

[0043] like Figure 1-Figure 12 As shown, it is a structural schematic diagram of an active quasi-zero stiffness vibration isolator based on an electromagnetic actuator provided in an embodiment of the present invention. In conjunction with the accompanying drawings, the active quasi-zero stiffness vibration isolator based on an electromagnetic actuator of the present invention is described as follows.

[0044] The embodiment of the present invention provides an active quasi-zero stiffness vibration isolator based on an electromagnetic actuator, such as Figure 1-Figure 8 As shown, an active quasi-zero stiffness vibration isolator based on an electromagnetic actuator comprises a spring sleeve 1, a connecting tube 2 and an electromagnetic actuator 3, wherein the electromagnetic actuator 3 is fixedly connected to the spring sleeve 1 through the connecting tube 2;

[0045] A slider 7 is provided in the spring sleeve 1, and a plurality of inclined springs 6 are connected between the slider 7 and the inner wall of the spring sleeve 1, and the inclined springs 6 are evenly distributed in the spring sleeve 1. An intermediate stabilizing rod 4 is fixedly provided at the end of the electromagnetic actuator mover 11 of the electromagnetic actuator 3, and the intermediate stabilizing rod 4 is fixedly connected to the slider 7. The spring sleeve 1 is fixedly connected to a cover plate 9 through an external sleeve 8, and an axial spring 19 is provided on the outer wall of the intermediate stabilizing rod 4 between the slider 7 and the cover plate 9.

[0046] One or more active quasi-zero stiffness vibration isolators based on electromagnetic actuators are installed between the vibration isolation object and the object to be isolated. The magnitude of the electromagnetic force is changed by changing the magnitude of the current flowing through the coil 14 in the electromagnetic actuator 3, thereby controlling the vibration of the vibration isolation object.

[0047] The optional solution of this embodiment is as follows: Figure 9-12 As shown, the electromagnetic actuator 3 includes an electromagnetic actuator mover 11 and an electromagnetic actuator stator 12. The electromagnetic actuator mover 11 is arranged in the electromagnetic actuator stator 12. The electromagnetic actuator mover 11 includes a winding drum 13 and a coil 14. There are two coils 14, which are both set on the outer wall of the winding drum 13. The coils 14 are electrically connected with leads 10. The outer top wall of the winding drum 13 is fixedly connected to the intermediate stabilizing rod 4 by bolts; the electromagnetic actuator stator 12 includes a magnetic steel outer cylinder 15, a permanent magnet 16 and a soft iron 17. The center of the magnetic steel outer cylinder 15 is A linear bearing 18 is fixedly arranged, and the connecting rod of the linear bearing 18 is fixedly connected to the inner top wall of the winding tube 13. The permanent magnet 16 and the soft iron 17 each include multiple groups, which are axially spaced on the outer wall of the linear bearing 18, and the adjacent poles of the permanent magnet 16 remain the same. By changing the current of the coil 14 in the electromagnetic actuator 3, different electromagnetic forces are generated to act on the electromagnetic actuator mover 11. The electromagnetic actuator mover 11 is actuated along the axial direction of the vibration isolator 3. By transmitting the force to the intermediate stabilizing rod, the vibration of the vibration isolation object can be controlled in real time.

[0048] It should be added that, according to different actuation force requirements, the coil 14 in the electromagnetic actuator adopts a single-layer coil or a multi-layer coil, and the permanent magnet 16 and the soft iron 17 in the stator 12 of the electromagnetic actuator are adjusted corresponding to the specifications of the coil 14 respectively.

[0049] The optional solution of this embodiment is as follows: Figure 4 As shown, the number of the inclined springs 6 is at least two, and the static bearing capacity of the system can be further improved by changing the number of the inclined springs 6 in the quasi-zero stiffness system, so that the vibration isolation object has a larger mass variation range.

[0050] It should be added that hinge supports 5 are provided at both ends of the inclined spring 6, a plurality of groups of U-shaped protrusions are fixedly provided on the inner wall of the spring sleeve 1, and U-shaped protrusions are fixedly provided on the outer wall of the slider 7 at positions opposite to the U-shaped protrusions on the inner wall of the spring sleeve 1. The hinge supports 5 on the inclined spring 6 are respectively hinged to the corresponding U-shaped protrusions, and the design of the U-shaped protrusions and the hinge supports 5 facilitates the installation and use of the inclined spring.

[0051] An optional solution of this embodiment is that the intermediate stabilizing rod 4 is fixedly connected to the slider 7 by bolts, so that the intermediate stabilizing rod 4 and the slider 7 can move synchronously with the mover 11 of the electromagnetic actuator 3 .

[0052] An optional solution of this embodiment is that a through hole is opened on the cover plate 9, and the end of the intermediate stabilizing rod 4 passes through the through hole and is arranged outside the cover plate 9, so as to facilitate the connection of the end of the intermediate stabilizing rod 4 with the seismic isolation object and facilitate the normal operation of the device.

[0053] An optional solution of this embodiment is that the outer sleeve 8 is divided into three parts: upper, middle and lower, and adjacent parts are connected by bolts.

[0054] An optional solution of this embodiment is that the middle stabilizing rod 4 is fixedly connected to the sliding block 7 by bolts, which is convenient for disassembly during maintenance.

[0055] Working principle:

[0056] One or more active quasi-zero stiffness vibration isolators based on electromagnetic actuators are connected to the object to be isolated by bolts, and the isolation object is connected to the end of the intermediate stabilizing rod 4 by bolts;

[0057] On the basis of the high static stiffness and low dynamic stiffness of the quasi-zero stiffness system, the electromagnetic actuator 3 is used to actively control the vibration isolation object. During the vibration isolation process, the stiffness of the oblique spring 6 and the axial spring 19 in the zero stiffness system is designed according to the mass of the vibration isolation object, so that the vibration isolation object can maintain a quasi-zero stiffness state after being installed on the middle stabilizing rod 4 of the vibration isolator 3, that is, in a static state, the oblique spring 6 just reaches a horizontal position after the vibration isolation object is installed. Under the small amplitude vibration state at this position, the stiffness of the system approaches zero, which can ensure that the vibration isolation object has a small dynamic stiffness;

[0058] When the vibration is transmitted from the vibration isolation object to the vibration isolation object, the active control technology is used to actively control the vibration of the vibration isolation object through the electromagnetic actuator 3. Specifically, a displacement sensor, a velocity sensor and an acceleration sensor are installed on the vibration isolation object to be used in conjunction with the present device, and a controller is used for control. The controller used here belongs to conventional control technology and will not be described in detail. The current flowing through the coil 13 in the electromagnetic actuator 3 is changed under the feedback signal of the sensor, the velocity sensor and the acceleration sensor, and electromagnetic forces of different magnitudes are generated after interacting with the permanent magnet 16 and the soft iron 17. The coil 14 is arranged on the electromagnetic actuator mover 11, and the electromagnetic force acts on the electromagnetic actuator mover 11. The electromagnetic actuator mover 11 is actuated along the axial direction of the vibration isolator 3. By transmitting the force to the intermediate stabilizing bar 4, the vibration of the vibration isolation object can be controlled, thereby improving the vibration isolation efficiency of the present device.

[0059] An active quasi-zero stiffness vibration isolator based on an electromagnetic actuator provided in an embodiment of the present invention can achieve the following technical effects: by setting an electromagnetic actuator 3 that can be actively adjusted, the advantages of quasi-zero stiffness technology and active control are fully utilized to enable the device to have an excellent vibration isolation effect in the entire frequency band. When the vibration is transmitted from the vibration isolation object to the vibration isolated object, the active control technology is used to actively control the vibration of the vibration isolation object through the electromagnetic actuator;

[0060] During the vibration isolation process, the stiffness of the axial spring 19 and the oblique spring 6 of the zero stiffness system is designed according to the mass of the vibration isolation object, so that the vibration isolation object maintains a quasi-zero stiffness state after being installed on the device, that is, in a static state, the oblique spring 6 just reaches a horizontal position after the vibration isolation object is installed. In the small amplitude vibration state at this position, the stiffness of the zero stiffness system approaches zero, which can ensure that the vibration isolation object has a small dynamic stiffness;

[0061] The current of the coil 14 in the electromagnetic actuator 3 is changed under the feedback signals of the displacement sensor, the velocity sensor and the acceleration sensor, thereby generating different electromagnetic forces acting on the electromagnetic actuator mover 11, and the electromagnetic actuator mover 11 transmits the force to the intermediate stabilizing bar 4, and the vibration of the vibration isolation object is controlled in real time through the intermediate stabilizing bar 4, thereby improving the vibration isolation efficiency of the device;

[0062] From the perspective of traditional linear vibration isolation theory, the vibration isolation frequency band of the device is improved. From the perspective of active vibration control, the advantages of active control technology in the low frequency band are fully utilized to suppress the low-frequency resonance peak.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An active quasi-zero stiffness vibration isolator based on an electromagnetic actuator, characterized in that: It comprises a spring sleeve (1), a connecting sleeve (2) and an electromagnetic actuator (3), wherein the electromagnetic actuator (3) is fixedly connected to the spring sleeve (1) via the connecting sleeve (2); A slider (7) is arranged in the spring sleeve (1), a plurality of inclined springs (6) are connected between the slider (7) and the inner wall of the spring sleeve (1), and the inclined springs (6) are evenly distributed in the spring sleeve (1), an intermediate stabilizing rod (4) is fixedly arranged at the end of the electromagnetic actuator mover (11) of the electromagnetic actuator (3), the intermediate stabilizing rod (4) is fixedly connected to the slider (7), the spring sleeve (1) is fixedly connected to a cover plate (9) via an external sleeve (8), and an axial spring (19) is arranged on the outer wall of the intermediate stabilizing rod (4) between the slider (7) and the cover plate (9); One or more active quasi-zero stiffness vibration isolators based on electromagnetic actuators are installed between a vibration isolation object and an object to be isolated, and the magnitude of the electromagnetic force is changed by changing the magnitude of the current flowing through the inner coil (14) of the electromagnetic actuator (3), thereby controlling the vibration of the vibration isolation object; The number of the oblique springs (6) is at least two; Both ends of the inclined spring (6) are provided with hinge supports (5), a plurality of groups of U-shaped protrusions are fixedly provided on the inner wall of the spring sleeve (1), and U-shaped protrusions are fixedly provided on the outer wall of the slider (7) at positions opposite to the U-shaped protrusions on the inner wall of the spring sleeve (1), and the hinge supports (5) on the inclined spring (6) are respectively hinged to the corresponding U-shaped protrusions.

2. The active quasi-zero stiffness vibration isolator based on an electromagnetic actuator according to claim 1, characterized in that: The electromagnetic actuator (3) comprises an electromagnetic actuator mover (11) and an electromagnetic actuator stator (12), wherein the electromagnetic actuator mover (11) is arranged in the electromagnetic actuator stator (12), and the electromagnetic actuator mover (11) comprises a winding drum (13) and a coil (14), wherein the number of the coils (14) is two and both are arranged on the outer wall of the winding drum (13), and both coils (14) are electrically connected to a lead wire (10), and the outer top wall of the winding drum (13) is connected to the intermediate stabilizing rod (4) by bolts. ) are fixedly connected; the electromagnetic actuator stator (12) comprises a magnetic steel outer cylinder (15), a permanent magnet (16) and a soft iron (17); a linear bearing (18) is fixedly arranged at the center of the magnetic steel outer cylinder (15), and a connecting rod of the linear bearing (18) is fixedly connected to the inner top wall of the winding cylinder (13); the permanent magnet (16) and the soft iron (17) each comprise a plurality of groups, which are axially spaced apart and arranged on the outer wall of the linear bearing (18), and the adjacent magnetic poles of the permanent magnet (16) are kept the same.

3. The active quasi-zero stiffness vibration isolator based on electromagnetic actuator according to claim 2, characterized in that: The coil (14) is a single-layer coil or a multi-layer coil, and the permanent magnet (16) and the soft iron (17) in the electromagnetic actuator stator (12) are adjusted to correspond to the specifications of the coil (14).

4. The active quasi-zero stiffness vibration isolator based on an electromagnetic actuator according to claim 1, characterized in that: The intermediate stabilizing rod (4) and the sliding block (7) are fixedly connected via bolts.

5. The active quasi-zero stiffness vibration isolator based on electromagnetic actuator according to claim 1, characterized in that: The cover plate (9) is provided with a through hole, and the end of the intermediate stabilizing rod (4) passes through the through hole and is arranged outside the cover plate (9).

6. The active quasi-zero stiffness vibration isolator based on electromagnetic actuator according to claim 1, characterized in that: The outer sleeve (8) is divided into three parts: upper, middle and lower, and adjacent parts are connected by bolts.

7. The active quasi-zero stiffness vibration isolator based on electromagnetic actuator according to claim 1, characterized in that: The intermediate stabilizing rod (4) and the sliding block (7) are fixedly connected via bolts.

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