A passive ultra-low frequency angular vibration control system and a vibration control method thereof

Abstract

The present invention discloses a passive ultra-low frequency angular vibration control system and an application method thereof. The system comprises a mounting frame and an upper cover plate. A plurality of vertical anti-shock devices are fixed in the middle area of ​​the bottom plate of the mounting frame. Transverse anti-shock devices are symmetrically fixed around the bottom plate. Quasi-zero stiffness supports are respectively fixed in the length, width and corner of the bottom plate. The upper ends of the vertical anti-shock devices and the quasi-zero stiffness supports are both fixed on the upper cover plate. There is a height spacing between the upper cover plate and the mounting frame. The quasi-zero stiffness supports provide large static stiffness to support the deadweight of the equipment. The quasi-zero stiffness supports introduce a cam-convex ring and a leaf spring negative stiffness mechanism to offset the positive stiffness of the disc spring, thereby realizing quasi-zero stiffness characteristics and ultra-low frequency angular vibration control. The vertical anti-shock devices play a role in limiting and resisting vertical, pitch angle and roll angle directions when the vibration amplitude exceeds the design threshold. The transverse anti-shock devices are arranged along the longitudinal and transverse directions of the mounting frame, respectively, so as to realize transverse, longitudinal and attitude angle direction anti-shock protection.

Description

Technical Field

[0001] The present invention relates to a vibration control and anti-shock system, and in particular to a passive ultra-low frequency angular vibration control system and a vibration control method thereof. Background Art

[0002] During mobile operations, the operation of auxiliary equipment and road excitation not only transmit directly to the laser transmitter but also excite the carrier system's inherent frequency, causing torsional vibrations in precision equipment like the laser defense weapon, significantly reducing the laser weapon's strike accuracy. More importantly, the road excitation and the vibrations in the carrier equipment it excites contain low-frequency components with large amplitudes, making their impact on the laser weapon more pronounced. Traditional vibration control systems, however, suffer from a conflict between support capacity and support stability, resulting in high stiffness and a high initial isolation frequency, making it difficult to effectively control low-frequency vibrations.

[0003] During the transfer process, high-precision combat weapons are inevitably subject to abnormal service conditions, such as potholes on the road and sudden braking due to unexpected circumstances. Under these abnormal service conditions, the equipment is subjected to impact, increasing the possibility of overturning and sliding, and the failure of internal electrical components. Summary of the Invention

[0004] The object of the present invention is to provide a passive ultra-low frequency angular vibration control system which has not only good vibration control performance but also good impact resistance performance.

[0005] The passive ultra-low frequency angular vibration control system provided by the present invention includes a mounting frame and an upper cover plate. A plurality of vertical anti-impact devices are fixed in the middle area of ​​the bottom plate of the mounting frame, and transverse anti-impact devices are symmetrically fixed around the four sides of the bottom plate. Quasi-zero stiffness supports are fixed in the length direction, width direction and corners of the bottom plate respectively. The upper ends of the vertical anti-impact devices and the quasi-zero stiffness supports are fixed on the upper cover plate, and there is a height distance between the upper cover plate and the mounting frame.

[0006] In one embodiment of the above technical solution, the mounting frame is a rectangular frame with an upper opening, the quasi-zero stiffness support is symmetrically fixed at the middle positions on both sides of the length direction and the width direction of the mounting frame, the quasi-zero stiffness support is symmetrically fixed at the four corners, and the lateral impact resister is symmetrically fixed on both sides of the quasi-zero stiffness support at each middle position on the bottom plate.

[0007] In one implementation of the above technical solution, a plurality of pairs of the vertical impact resisters are symmetrically arranged with respect to a center plane in the length direction and the width direction of the bottom plate.

[0008] In one embodiment of the above technical solution, the vertical anti-impact device includes a support rod, a locking nut, an anti-impact block, a steel plate gasket and an anti-impact buckle; the upper half of the support rod is a threaded section, the anti-impact block is a rubber block, vulcanized on the steel plate gasket, the bottom and top of the threaded section are respectively connected to the anti-impact block, the outer sides of the two steel pads are respectively limited by locking nuts, and the lower end of the support rod is vertically connected to the mounting plate; the anti-impact buckle is a pair of rectangular frames with open side walls and a rectangular notch in the middle of the bottom surface, the width of the rectangular frame is greater than the diameter of the anti-impact block, the width of the rectangular notch is greater than the outer diameter of the support rod, the anti-impact buckle is sleeved on the top periphery of the support rod, the anti-impact block at the top of the threaded section of the support rod is located inside the anti-impact buckle, and the anti-impact block at the bottom of the threaded section is located outside the anti-impact buckle; the mounting plate is fixed to the bottom plate of the mounting frame, and the top surface of the anti-impact buckle is fixed to the upper cover plate.

[0009] In one embodiment of the above technical solution, the lateral impact absorber includes a mounting seat and a rubber impact column. The rubber impact column is arranged in a horizontal direction, one end of which is fixed to the top of the mounting seat by a steel plate and screws, and the lower end of the mounting seat is fixed to the bottom plate of the mounting frame. There is a gap between the outer end of the rubber impact column and the inner wall of the mounting frame.

[0010] In one embodiment of the above technical solution, the quasi-zero stiffness support includes an elastic support assembly, a spring beam and a sleeve; the two ends of the elastic support assembly are ball joints, and an upper guide rod with a convex ring, a disc spring assembly connected to the lower end of the upper guide rod and an adjusting nut are connected between the two ball joints, and a sliding bearing is connected above the corresponding convex ring on the upper guide rod; the spring beam includes a leaf spring and a connecting beam, the two leaf springs are arranged parallel to each other up and down, the two connecting beams are symmetrically connected to the two sides of a diameter surface of the two leaf springs, and there are cams on the opposite sides of the connecting beam; the spring beam is sleeved outside the upper guide rod, and the cam on its connecting beam contacts the convex ring on the upper guide rod; the sleeve is sleeved outside the spring beam, and the two ends of the spring beam are limited by the step surface inside the sleeve, the lower end of the sleeve is threadedly connected to the adjusting nut, and the upper end is connected to the outer wall of the sliding bearing.

[0011] In one embodiment of the above technical solution, the upper guide rod is a cylindrical rod having an axial center screw hole at its upper end and an axial center circular hole at its lower end. The disc spring assembly includes a disc spring, a disc spring clip and a connecting rod. There are two disc spring clips, which are disc bodies with ribs. The two disc spring clips are arranged relative to each other with the ribs. One end of the connecting rod is vertically fixed to the center position of a disc spring clip. There are an even number of disc springs, which are inserted into the connecting rod in a buckled manner. The other end of the connecting rod passes through the center position of another disc spring clip and is inserted into the axial center circular hole at the lower end of the upper guide rod.

[0012] In one embodiment of the above technical solution, the ball joint includes a ball joint seat with a mounting plate and a ball head rod hinged thereto, the outer end of the ball head rod has a threaded section, the ball head rod of the ball joint at the lower end of the elastic support assembly is connected to the adjusting nut, the upper section of the adjusting nut is a threaded section, the disc spring buckle at the lower end of the disc spring assembly is centered on the upper end surface of the adjusting nut, the ball head rod of the ball joint at the upper end of the elastic support assembly is connected to the axial center screw hole at the upper end of the upper guide rod, and the mounting plates of the two ball joints are respectively connected and fixed to the upper cover plate and the bottom plate of the mounting frame by screws.

[0013] In one embodiment of the above technical solution, the sleeve includes an upper sleeve and a lower sleeve, both of which are cylindrical cylinders, the top of the outer wall of the lower sleeve and the top inner wall of the upper sleeve are connected by threads, the top of the inner wall of the lower sleeve and the bottom of the inner wall of the upper sleeve are respectively provided with spring beam limiting steps, and observation ports are opened on both sides of the middle and lower part of the lower sleeve, and a transparent plastic block is embedded in the observation port, and an adjustment pointer is vertically fixed on the inner wall of the transparent plastic block, and there is an axial scale line at the lower part of the upper guide rod corresponding to the observation port.

[0014] The present invention provides a vibration control method for the above-mentioned system, in which the upper cover of the system is connected to the precision instrument and equipment to be protected, the mounting frame is connected to the main body of the carrying equipment, and the quasi-zero stiffness supporter serves as the elastic support part of the system. The disc springs therein are compressed, and the cam on the spring beam and the convex ring on the upper guide rod contact to form a cam-convex ring and the leaf spring to form a negative stiffness mechanism, which offsets the positive stiffness of the disc spring and forms a quasi-zero stiffness characteristic; when the system is subjected to a vibration load, relative movement occurs between the upper cover and the mounting frame, and when the vibration amplitude exceeds the design threshold, the anti-impact buckle of the vertical anti-impact device contacts the upper and lower anti-impact blocks, which plays a limiting and anti-impact role in the vertical, pitch angle and roll angle directions, and at the same time, the upper cover contacts the transverse anti-impact device, which plays a limiting and anti-impact role in the transverse / longitudinal and attitude angle directions.

[0015] The present invention connects multiple quasi-zero stiffness supports, multiple vertical anti-shock devices and multiple lateral anti-shock devices between the mounting frame and the upper cover plate to build a six-degree-of-freedom angular vibration control platform for the system, realizing multi-directional angular vibration control, and providing large static stiffness through the quasi-zero stiffness supports to support the weight of the equipment. The quasi-zero stiffness supports introduce cam-convex rings and leaf springs as negative stiffness mechanisms to offset the positive stiffness of the disc springs, thereby realizing quasi-zero stiffness characteristics and ultra-low frequency angular vibration control; multiple vertical anti-shock devices play a limiting and anti-shock role in the vertical, pitch angle and roll angle directions when the vibration amplitude exceeds the design threshold; multiple lateral anti-shock devices are respectively arranged along the longitudinal and transverse directions of the mounting frame, which can realize anti-shock protection in the transverse, longitudinal and attitude angle directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the appearance of an embodiment of the present invention.

[0017] Figure 2 for Figure 1 Schematic diagram of the shaft side structure after removing the upper cover.

[0018] Figure 3 for Figure 2 Enlarged structural diagram of the quasi-zero stiffness support.

[0019] Figure 4 for Figure 3 Schematic diagram of the structure after removing the sleeve.

[0020] Figure 5 for Figure 2 Schematic diagram of the enlarged structure of the central vertical impactor. DETAILED DESCRIPTION

[0021] Combine Figure 1 、 Figure 2 As can be seen, the ultra-low-frequency angular vibration control system disclosed in this embodiment includes an upper cover plate 1, a mounting frame 2, a quasi-zero-stiffness support 3, a lateral impactor 4, and a vertical impactor 5. When the system is in use, the upper cover plate is connected to the precision instrument to be protected, and the mounting frame is connected to the main body of the equipment.

[0022] The mounting frame 2 is a rectangular frame with an upper opening, and a total of eight quasi-zero stiffness supports 3 are fixed on its base plate, four of which are symmetrically fixed at the middle positions on both sides of the base plate in the length direction and the width direction, and the other four are symmetrically fixed at the four corners of the base plate, and the quasi-zero stiffness supports at the corners are symmetrically inclined toward the quasi-zero stiffness support at the middle position in the width direction. The fixed position of each quasi-zero stiffness support on the base plate is located outside the fixed position on the upper cover plate.

[0023] The eight quasi-zero stiffness supports 3 serve as the elastic support part of the system, building a six-degree-of-freedom angular vibration control platform of the system, which can realize multi-directional angular vibration control.

[0024] Combine Figure 3 、 Figure 4 It can be seen that:

[0025] The quasi-zero stiffness support rod device 3 includes an elastic support assembly 31 , a spring beam 32 and a sleeve 33 .

[0026] The elastic support assembly 31 includes a ball joint 311 , an adjusting nut 312 , a disc spring buckle 313 , a connecting rod, a disc spring 314 , an upper guide rod 315 , and a sliding bearing 316 .

[0027] The ball joint 311 includes a ball joint seat with a mounting plate and a ball rod hinged thereto, wherein the outer end of the ball rod has a threaded section.

[0028] The upper section of the adjusting nut 312 is a threaded section, which is connected to the upper end of the ball rod of the lower ball joint.

[0029] The upper guide rod 315 is a cylindrical rod with an axial center screw hole at its upper end, an axial center circular hole at its lower end, and a convex ring on the outer wall of the middle portion.

[0030] There are two disc spring clips 313, which are disc bodies with ribs. The two disc spring clips 313 are arranged opposite to each other with the ribs. One end of the connecting rod is vertically fixed to the center position of one disc spring clip. There are four disc springs 314, which are inserted into the connecting rod in a buckled manner. The other end of the connecting rod passes through the center position of another disc spring clip and is inserted into the axial center circular hole at the lower end of the upper guide rod 315.

[0031] The sliding bearing 316 is connected above the corresponding convex ring on the upper guide rod 315.

[0032] The leaf spring beam 32 includes a leaf spring 321 and a connecting beam 322 . The two leaf springs are arranged in parallel up and down. The two connecting beams are symmetrically connected to the two sides of a diameter surface of the two leaf springs. There are cams on the opposite sides of the connecting beams.

[0033] The leaf spring beam 32 is sleeved on the outer side of the upper guide rod 315 , and the cam on the connecting beam 322 contacts the convex ring on the upper guide rod 315 .

[0034] The sleeve 33 includes an upper sleeve 331 and a lower sleeve 332 , both of which are cylindrical cylinders. The top of the outer wall of the lower sleeve 331 and the bottom inner wall of the upper sleeve are connected by threads.

[0035] The top of the inner wall of the lower sleeve 331 and the bottom of the inner wall of the upper sleeve 332 are respectively provided with spring beam limit steps. Observation ports are opened on both sides of the middle and lower part of the lower sleeve 331, and transparent plastic blocks 3311 are embedded in the observation ports. An adjustment pointer 3312 is vertically fixed to the inner wall of the transparent plastic block. There is an axial scale line on the lower part of the upper guide rod 315 corresponding to the observation port.

[0036] The sleeve 33 is sleeved on the outside of the spring beam 32, and the two leaf springs of the spring beam 32 are respectively limited and installed by the stepped surfaces on the inner walls of the lower sleeve and the upper sleeve. The lower end of the lower sleeve 331 is threadedly connected to the upper part of the adjusting nut 312, and the upper end is connected to the outer wall of the sliding bearing 316.

[0037] The axial center screw hole at the upper end of the upper guide rod 315 is connected to another ball joint 311 .

[0038] Combine Figures 2 to 4 It can be seen that when each quasi-zero stiffness support is installed, the mounting plates of the ball joints at both ends are fixed to the bottom plate of the mounting frame and the upper cover plate 1 by screws respectively, and there is a height distance between the upper cover plate and the upper edge of the mounting frame.

[0039] The quasi-zero stiffness support adjusts the load-bearing capacity of the upper guide rod by rotating the adjustment nut 312. The specific adjustment amount is read by the sliding distance of the adjustment pointer on the transparent plastic block embedded in the lower sleeve along the scale line on the upper guide rod. When the adjustment nut is rotated, the upper end of the upper sleeve moves along the upper guide rod via the sliding bearing, reducing friction.

[0040] The disc spring installed inside the quasi-zero stiffness support provides high static stiffness to support the weight of the equipment; the cam-convex ring-leaf spring is introduced as a negative stiffness mechanism to offset the positive stiffness of the disc spring, achieving zero stiffness characteristics and ultra-low frequency angular vibration control.

[0041] The upper cover 1 is a rectangular plate with the same plane size as the outer size of the mounting frame, and the lower side thereof is limited by the inner wall of the mounting frame 2, such as Figure 1 After the upper cover plate 1 is fixed on each quasi-zero stiffness support 3, the mounting frame 2 is completely covered to prevent rain and dust from entering, thereby protecting the internal components of the mounting frame.

[0042] from Figure 2 It can be seen that the mounting frames 6 are symmetrically fixed on both sides of the quasi-zero stiffness support at the center position in the length direction and the width direction on the bottom plate of the mounting frame 2, and the top of each mounting frame 6 is connected to a transverse impact resistor 4 along the horizontal direction. The transverse impact resistor 4 includes a cylindrical plastic column and a steel plate at its inner end, and the end of the steel plate is fixed to the mounting frame 6 by screws.

[0043] This system achieves impact protection in the lateral, longitudinal and angular directions.

[0044] Combine Figure 2 and Figure 5 It can be seen that:

[0045] Two groups of four vertical impactors 5 are set in the middle area of ​​the bottom plate of the installation frame 2. The vertical impactors 5 include a support rod 51, a locking nut 52, an impact block 53, a steel backing plate 54 and an impact buckle 55.

[0046] The upper half of the support rod 51 is a threaded section, and the impact block 53 is a rubber block vulcanized on a steel plate gasket 54. The bottom and top of the threaded section of the support rod 51 are respectively connected to the impact block 53. The outer sides of the two steel plates 54 are respectively limited by locking nuts 52. The lower end of the support rod 51 is vertically connected to the mounting plate. The impact buckle 55 is a rectangular parallelepiped frame with a pair of open side walls and a rectangular notch in the middle of the bottom surface. The width of the rectangular frame is greater than the diameter of the impact block 53, and the width of the rectangular notch is greater than the outer diameter of the support rod 51. The impact buckle 55 is sleeved on the top periphery of the support rod 51. The impact block at the top of the threaded section of the support rod is located inside the impact buckle 55, and the impact block 53 at the bottom of the threaded section is located outside the impact buckle. The support rod can move freely within a certain range without any limitation.

[0047] When the vertical anti-impact device 5 is installed, the mounting plate at the lower end of the support rod is fixed to the bottom plate of the mounting frame by screws, and the top surface of the anti-impact buckle is fixed to the upper cover plate 1 by screws.

[0048] This system uses vertical anti-impact devices to achieve vertical, pitch angle and roll angle limitation and impact resistance.

[0049] The quasi-zero stiffness supporter 3 of this system serves as an elastic supporting part, and the disc spring 314 inside it is compressed. The cam on the spring beam and the convex ring on the upper guide rod contact to form a cam-convex ring and leaf spring to form a negative stiffness mechanism, which offsets the positive stiffness of the disc spring and forms a quasi-zero stiffness characteristic.

[0050] When the system is subjected to vibration loads, the upper cover plate 1 and the mounting frame 2 move relative to each other, driving the vertical anti-impact device's anti-impact buckle 55 and the support rod 51 to move relative to each other. When the vibration amplitude is less than the set threshold, the anti-impact buckle and the anti-impact block 53 do not contact each other. When the vibration amplitude exceeds the designed threshold, the anti-impact buckle and the anti-impact block 53 contact each other, acting as a limiter and shock absorber.

[0051] When the vibration amplitude is less than the design threshold, the upper cover plate does not contact the transverse anti-impact device and the transverse anti-impact device does not work. When the vibration amplitude is greater than the design threshold, the upper cover plate contacts the transverse anti-impact device and the transverse anti-impact device starts to work, playing a role of transverse and longitudinal limiting and impact resistance.

[0052] In summary, the present invention connects multiple quasi-zero stiffness supports, multiple vertical anti-shock devices and multiple lateral anti-shock devices between the mounting frame and the upper cover plate to build a six-degree-of-freedom angular vibration control platform for the system, realizing multi-directional angular vibration control, and providing large static stiffness through the quasi-zero stiffness supports to support the weight of the equipment. The quasi-zero stiffness supports introduce cam-convex rings and leaf springs as negative stiffness mechanisms to offset the positive stiffness of the disc springs, thereby realizing quasi-zero stiffness characteristics and ultra-low frequency angular vibration control; multiple vertical anti-shock devices play a limiting and anti-shock role in the vertical, pitch angle and roll angle directions when the vibration amplitude exceeds the design threshold; multiple lateral anti-shock devices are arranged along the longitudinal and transverse directions of the mounting frame, respectively, to realize anti-shock protection in the transverse, longitudinal and attitude angle directions.

Claims

1. A passive ultra-low frequency angular vibration control system, characterized in that: It includes a mounting frame and an upper cover plate. A plurality of vertical impactors are fixed in the middle area of ​​the bottom plate of the mounting frame. Transverse impactors are symmetrically fixed around the bottom plate. Quasi-zero stiffness supports are respectively fixed in the length direction, width direction and corners of the bottom plate. The upper ends of the vertical impactors and the quasi-zero stiffness supports are fixed on the upper cover plate. There is a height distance between the upper cover plate and the mounting frame. The mounting frame is a rectangular parallelepiped frame with an upper opening, the quasi-zero stiffness supports are symmetrically fixed at the middle positions on both sides of the mounting frame in the length direction and the width direction, the quasi-zero stiffness supports are symmetrically fixed at the four corners, and the transverse impactors are symmetrically fixed on both sides of the quasi-zero stiffness supports at each middle position on the bottom plate; The quasi-zero stiffness support device comprises an elastic support component, a spring beam and a sleeve; the two ends of the elastic support component are ball joints, an upper guide rod with a convex ring, a disc spring component and an adjusting nut connected to the lower end of the upper guide rod are connected between the two ball joints, and a sliding bearing is connected above the corresponding convex ring on the upper guide rod; the spring beam comprises a leaf spring and a connecting beam, the two leaf springs are arranged in parallel up and down, the two connecting beams are symmetrically connected to the two sides of a diameter surface of the two leaf springs, and cams are provided on the opposite sides of the connecting beam; the spring beam is sleeved outside the upper guide rod, and the cam on its connecting beam contacts the convex ring on the upper guide rod; the sleeve is sleeved outside the spring beam, and the two ends of the spring beam are limited by the step surface in the sleeve, the lower end of the sleeve is threadedly connected to the adjusting nut, and the upper end is connected to the outer wall of the sliding bearing; The upper guide rod is a cylindrical rod, with an axial center screw hole at its upper end and an axial center circular hole at its lower end. The disc spring assembly includes a disc spring, a disc spring buckle and a connecting rod. There are two disc spring buckles, which are disc bodies with ribs. The two disc spring buckles are arranged opposite to each other with the ribs. One end of the connecting rod is vertically fixed at the center position of a disc spring buckle. There are an even number of disc springs, which are inserted into the connecting rod in a buckling manner. The other end of the connecting rod passes through the center position of another disc spring buckle and is inserted into the axial center circular hole at the lower end of the upper guide rod. The ball joint includes a ball joint seat with a mounting plate and a ball head rod hinged thereto, the outer end of the ball head rod has a threaded section, the ball head rod of the ball joint at the lower end of the elastic support assembly is connected to the adjusting nut, the upper section of the adjusting nut is a threaded section, the disc spring buckle at the lower end of the disc spring assembly is centered on the upper end surface of the adjusting nut, the ball head rod of the ball joint at the upper end of the elastic support assembly is connected to the axial center screw hole at the upper end of the upper guide rod, and the mounting plates of the two ball joints are respectively connected and fixed to the upper cover plate and the bottom plate of the mounting frame by screws.

2. The passive ultra-low frequency angular vibration control system according to claim 1, characterized in that: The vertical impactors are arranged in pairs symmetrically about the center plane in the length direction and the width direction of the bottom plate.

3. The passive ultra-low frequency angular vibration control system according to claim 1, characterized in that: The vertical anti-impact device includes a support rod, a locking nut, an anti-impact block, a steel plate gasket and an anti-impact buckle; the upper half of the support rod is a threaded section, the anti-impact block is a rubber block, vulcanized on the steel plate gasket, the bottom and top of the threaded section are respectively connected with the anti-impact blocks, the outer sides of the two steel pads are respectively limited by locking nuts, and the lower end of the support rod is vertically connected with a mounting plate; the anti-impact buckle is a pair of rectangular frames with open side walls and a rectangular notch in the middle of the bottom surface, the width of the rectangular frame is greater than the diameter of the anti-impact block, the width of the rectangular notch is greater than the outer diameter of the support rod, the anti-impact buckle is sleeved on the top periphery of the support rod, the anti-impact block at the top of the threaded section of the support rod is located inside the anti-impact buckle, and the anti-impact block at the bottom of the threaded section is located outside the anti-impact buckle; the mounting plate is fixed to the bottom plate of the mounting frame, and the top surface of the anti-impact buckle is fixed to the upper cover plate.

4. The passive ultra-low frequency angular vibration control system according to claim 1, characterized in that: The lateral impact device includes a mounting seat and a rubber impact column. The rubber impact column is arranged in the horizontal direction, one end of which is fixed to the top of the mounting seat by a steel plate and screws, the lower end of the mounting seat is fixed to the bottom plate of the mounting frame, and there is a distance between the outer end of the rubber impact column and the inner wall of the mounting frame.

5. The passive ultra-low frequency angular vibration control system according to claim 1, characterized in that: The sleeve includes an upper sleeve and a lower sleeve, both of which are cylindrical sleeves. The top of the outer wall of the lower sleeve and the top inner wall of the upper sleeve are connected by threads. The top of the inner wall of the lower sleeve and the bottom of the inner wall of the upper sleeve are respectively provided with spring beam limiting steps. Observation ports are opened on both sides of the lower and middle part of the lower sleeve, and transparent plastic blocks are embedded in the observation ports. An adjustment pointer is vertically fixed on the inner wall of the transparent plastic block. There is an axial scale line at the lower part of the upper guide rod corresponding to the observation port.

6. A method for vibration control using the system of claim 1, characterized in that: The upper cover of the system is connected to the precision instruments and equipment to be protected, the mounting frame is connected to the main body of the carrier, and the quasi-zero stiffness supporter serves as the elastic support part of the system. The disc springs in the supporter are compressed, and the cam and the convex ring on the upper guide rod contact to form a negative stiffness mechanism formed by the cam-convex ring and the leaf spring, which offsets the positive stiffness of the disc spring and forms a quasi-zero stiffness characteristic. When the system is subjected to vibration load, relative movement occurs between the upper cover and the mounting frame. When the vibration amplitude exceeds the design threshold, the anti-impact buckle of the vertical anti-impact device contacts the upper and lower anti-impact blocks, which play a role in limiting and resisting the vertical, pitch angle and roll angle directions. At the same time, the upper cover contacts the transverse anti-impact device, which plays a role in limiting and resisting the transverse / longitudinal and attitude angle directions.

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