A quasi-zero stiffness vibration isolator

Abstract

The present application relates to a kind of quasi-zero stiffness vibration isolators, including installation structure, bearing structure, rotating structure and buffer structure;Installation structure includes mounting plate, connecting arm and installation part, connecting arm and installation part are located on the same side of mounting plate;Bearing structure includes bearing plate, guide arm and driving arm, bearing plate is located on the side of mounting plate with connecting arm, and is spaced apart from mounting plate, guide arm and driving arm are located on the side of bearing plate close to mounting plate, guide arm is movably arranged in connecting arm, to be able to be synchronously moved with bearing plate;Rotating structure includes rotating arm and transmission part, rotating arm is rotatably connected to installation part around the axis in horizontal direction, transmission part is drivingly connected between rotating arm and driving arm;Buffer structure includes first elastic member and second elastic member, first elastic member is arranged between guide arm and connecting arm, second elastic member is arranged between rotating arm and installation part.The present application improves the stability of bearing plate reset.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vibration isolators, in particular to a quasi-zero stiffness vibration isolator. BACKGROUND

[0002] The quasi-zero stiffness vibration isolator is connected in parallel with a negative stiffness element and a positive stiffness element to achieve zero stiffness characteristics at the static balance position. Compared with the traditional linear vibration isolator (effective isolation frequency is greater than 2 times the natural frequency, and the vibration isolation frequency band range is narrow), the quasi-zero stiffness vibration isolator realizes the characteristics of high static stiffness and low dynamic stiffness, has a large bearing capacity, and has small structural deformation and a widened vibration isolation frequency band. According to different types of negative stiffness structures, the types of quasi-zero stiffness vibration isolators are also different.

[0003] For example, patent CN 113503336 B discloses a constant quasi-zero stiffness vibration isolator, which is provided with a group of linear springs between the receiving platform and the fixed base, and the middle block is fixedly connected with the fixed base, and the middle block is uniformly distributed with compression rods that are opposite to each other in the horizontal circumferential direction. The compression rods can provide negative stiffness when they are compressed into buckling deformation state, and can realize quasi-zero stiffness when connected in parallel with the linear springs of positive stiffness. In this state, the vibration isolation and buffering effect of the workpiece to be isolated can be realized. This vibration isolator can meet the needs of low-frequency and ultra-low-frequency vibration isolation. However, in the technical solution, the reset of the object table is supported only by the elastic force of a group of springs, which leads to poor reset performance of the vibration isolator, and reduces the vibration isolation effect when carrying heavy equipment. SUMMARY

[0004] Therefore, it is necessary to provide a quasi-zero stiffness vibration isolator to solve the technical problem that the reset of the object table in the prior art is supported only by the elastic force of a group of springs, which leads to poor reset performance of the vibration isolator.

[0005] The present application provides a quasi-zero stiffness vibration isolator, which comprises:

[0006] The mounting structure comprises a mounting plate, a connecting arm and a mounting portion, the connecting arm and the mounting portion are arranged on the same side of the mounting plate;

[0007] The bearing structure comprises a bearing plate, a guide arm and a driving arm, the bearing plate is located on the side of the mounting plate where the connecting arm is arranged, and is arranged in a spaced manner with the mounting plate and can move in the direction of approaching and moving away from the mounting plate, the guide arm and the driving arm are arranged on the side of the bearing plate close to the mounting plate, and the guide arm is movably arranged on the connecting arm so as to move synchronously with the bearing plate;

[0008] The rotating structure comprises a rotating arm and a transmission part, the rotating arm is rotatably connected to the mounting part around an axis in the horizontal direction, the transmission part is rotatably connected between the rotating arm and the driving arm, and is used to convert the movement of the bearing plate into the rotation of the rotating arm; and

[0009] The buffering structure comprises a first elastic member and a second elastic member, the first elastic member is arranged between the guide arm and the connecting arm, and is deformed when the guide arm moves away from the mounting plate, so as to hinder the movement of the guide arm, the second elastic member is arranged between the rotating arm and the mounting part, and is deformed when the rotating arm rotates, so as to drive the rotating arm to return.

[0010] Optionally, the connecting arm is provided with a guide channel extending away from the mounting plate, an end of the guide channel away from the mounting plate is open, and the inner wall of the guide channel is provided with a stop block;

[0011] The guide arm is provided with a matching block, the matching block is located on the side of the stop block close to the mounting plate, wherein the first elastic member is arranged between the stop block and the matching block.

[0012] Optionally, the matching block is arranged at the end of the guide arm close to the mounting plate, and the material of the matching block is rubber; and / or,

[0013] The first elastic member is a compression spring.

[0014] Optionally, the transmission part is a transmission arm, one end of the transmission arm is rotatably connected to the driving arm around an axis in the horizontal direction, and the other end of the transmission arm is rotatably connected to the rotating arm, so that the rotating arm can be driven to rotate around its own axis when the bearing plate moves close to and away from the mounting plate.

[0015] Optionally, the rotating arm comprises a main arm and a bent arm, the main arm is rotatably connected to the transmission arm, and the bent arm is arranged at one end of the main arm and is rotatably connected to the mounting part around an axis in the horizontal direction.

[0016] The second elastic member is arranged between the bent arm and the mounting part, and is deformed when the bent arm rotates, so as to drive the bent arm to return.

[0017] Optionally, the mounting structure further comprises a guide part and a fixing part, the guide part, the fixing part and the mounting part are arranged on the same side of the mounting plate, and the guide part and the fixing part are arranged in the horizontal direction.

[0018] The quasi-zero stiffness vibration isolator further comprises a movable arm, which is located between the guide part and the fixed part, movably arranged on the mounting plate in a horizontal direction, capable of approaching and moving away from the guide part, and is provided with a matching part thereon;

[0019] The bending arm is provided with a driving part, which is drivingly connected with the matching part, for converting the rotation of the bending arm into the movement of the movable arm;

[0020] The buffer structure further comprises a third elastic member and a fourth elastic member, the third elastic member is arranged between the movable arm and the matching part, for deforming when the movable arm moves towards the guide part, to hinder the movement of the movable arm, and the fourth elastic member is arranged between the movable arm and the fixed part, for deforming when the movable arm moves away from the guide part, to hinder the movement of the movable arm.

[0021] Optionally, the guide part is a slide rod arranged on the connecting arm in a horizontal direction, the slide rod is provided with a protrusion, and the fixed part is a fixed cylinder arranged on the mounting plate, which extends in a horizontal direction;

[0022] One end of the movable arm close to the slide rod is hinged with a buffer rod, and the other end extends into the inner cavity of the fixed cylinder, one end of the buffer rod away from the movable arm is hinged with a sliding block, the sliding block is slidingly arranged on the slide rod, wherein the third elastic member is arranged between the protrusion and the sliding block, and the fourth elastic member is fixed to the inner wall of the fixed cylinder and located on the side of the movable arm away from the slide rod.

[0023] Optionally, two bending arms are arranged at both ends of the main arm, and correspondingly, the connecting arm, the slide rod, the third elastic member and the movable arm are provided with two, the two connecting arms are arranged in a horizontal direction, and the two slide rods, the two third elastic members, the two movable arms and the two connecting arms correspond one by one;

[0024] Wherein, one end of the two movable arms away from the corresponding slide rod extends into the inner cavity of the fixed cylinder.

[0025] Optionally, one end of the bending arm away from the main arm extends in a horizontal direction and is provided with an extension arm, one end of the extension arm away from the main arm is rotationally connected to the mounting part around an axis in a horizontal direction, wherein the second elastic member is arranged between the extension arm and the mounting part, and the driving part is a driving conical tooth arranged on the extension arm;

[0026] The quasi-zero stiffness vibration isolator further comprises a vertical rod arranged on the mounting plate, the vertical rod is arranged in correspondence with the driving bevel gear and rotates around an axis in the vertical direction, and a transmission bevel gear and a spur gear are arranged on the vertical rod, the transmission bevel gear is engaged with the driving bevel gear;

[0027] The matching part is a rack arranged on the movable arm, the rack is engaged with the spur gear to convert the rotation of the bending arm into the movement of the movable arm.

[0028] Optionally, the mounting part is a mounting shell arranged on the connecting arm, one end of the rotating arm extends into the mounting shell and is rotatably connected with the inner wall of the mounting shell.

[0029] The second elastic member is a clock spring, one end of the clock spring is fixed to the inner wall of the mounting shell and the other end is fixed to the rotating arm.

[0030] Compared with the prior art, when the bearing plate receives a downward force, the bearing plate moves towards the mounting plate, and the driving arm on the lower side of the bearing plate moves downwards at the same time; when the driving arm moves downwards, the driving arm can be driven through the transmission part to convert the movement of the bearing plate into the rotation of the rotating arm, and the second elastic member arranged between the rotating arm and the mounting part is elastically deformed when the rotating arm rotates to generate elastic force, thereby preventing the rotating arm from rotating and driving the rotating arm to return, i.e. preventing the bearing plate from moving downwards and providing elastic force for the return of the bearing plate, thereby achieving the first buffering.

[0031] When the bearing plate moves upwards to return, the guide arm on the lower side of the bearing plate moves at the same time, and the first elastic member is elastically deformed when the guide arm moves away from the mounting plate to generate elastic force, i.e. achieving the second buffering in the opposite direction, which can ensure the stable return of the bearing plate.

[0032] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, and the content of the specification can be implemented, and the preferred embodiments of the present application are described in detail below. The specific embodiments of the present application are described in detail below. BRIEF DESCRIPTION OF DRAWINGS

[0033] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application, the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0034] Figure 1 The structure schematic diagram of an embodiment of the quasi-zero stiffness vibration isolator provided by the present application;

[0035] Figure 2 Fig. 1 is a schematic view of the mounting structure; Figure 1 Fig. 2 is a schematic view of the mounting structure;

[0036] Figure 3 Fig. 3 is a schematic view of the bearing structure and the first elastic member; Figure 1 Fig. 4 is a schematic view of the bearing structure and the first elastic member;

[0037] Figure 4 Fig. 5 is a schematic view of the rotating structure; Figure 1 Fig. 6 is a schematic view of the rotating structure;

[0038] Figure 5 Fig. 7 is a sectional view of the mounting portion, the second elastic member and the extension arm; Figure 1 Fig. 8 is a sectional view of the mounting portion, the second elastic member and the extension arm; Fig. 9 is a sectional view of the mounting portion, the second elastic member and the extension arm;

[0039] Fig. 10 is a schematic view of the movable arm; Figure 6 Fig. 11 is a schematic view of the movable arm; Figure 1 Fig. 12 is a schematic view of the movable arm; Fig. 13 is a schematic view of the movable arm;

[0040] Fig. 14 is a schematic view of the movable arm; Figure 7 Fig. 15 is an enlarged schematic view of A in Fig. 12; Figure 1 Fig. 16 is an enlarged schematic view of B in Fig. 12; Fig. 17 is an enlarged schematic view of B in Fig. 12;

[0041] Fig. 18 is an enlarged schematic view of B in Fig. 12. Figure 8 Fig. 19 is an enlarged schematic view of B in Fig. 12. Figure 1 Fig. 20 is an enlarged schematic view of B in Fig. 12. Fig. 21 is an enlarged schematic view of B in Fig. 12.

[0042] Fig. 22 is an enlarged schematic view of B in Fig. 12. Fig. 23 is an enlarged schematic view of B in Fig. 12.

[0043] 100, quasi-zero stiffness vibration isolator; 1, mounting structure; 11, mounting plate; 12, connecting arm; 12a, guide channel, 121, stop block; 13, mounting portion; 131, mounting shell; 14, guide portion, 141, sliding rod; 142, protrusion; 15, fixing portion; 151, fixing cylinder; 2, bearing structure; 21, bearing plate; 22, guide arm; 221, matching block; 23, driving arm; 3, rotating structure; 31, rotating arm; 311, main arm; 312, bent arm; 313, extension arm; 32, transmission portion; 321, transmission arm; 33, driving portion; 331, driving conical tooth; 4, buffer structure; 41, first elastic member; 42, second elastic member; 43, third elastic member; 44, fourth elastic member; 6, movable arm; 61, matching portion; 611, rack; 62, buffer rod; 63, sliding block; 7, vertical rod; 71, transmission conical tooth; 72, spur gear. DETAILED DESCRIPTION

[0044] The preferred embodiments of the present application will be described in detail hereinafter with reference to the drawings, in which the preferred embodiments of the present application are constructed as a part of the present application and used to explain the principles of the present application, but not to limit the scope of the present application.

[0045] Please refer to Figures 1 to 8The quasi-zero stiffness vibration isolator 100 comprises a mounting structure 1, a bearing structure 2, a rotating structure 3 and a buffering structure 4; the mounting structure 1 comprises a mounting plate 11, a connecting arm 12 and a mounting part 13, the connecting arm 12 and the mounting part 13 are arranged on the same side of the mounting plate 11; the bearing structure 2 comprises a bearing plate 21, a guide arm 22 and a driving arm 23, the bearing plate 21 is arranged on the side of the mounting plate 11 where the connecting arm 12 is arranged, and is arranged in a spaced manner with the mounting plate 11 and can move in the direction of approaching or moving away from the mounting plate 11, the guide arm 22 and the driving arm 23 are arranged on the side of the bearing plate 21 close to the mounting plate 11, and the guide arm 22 is movably arranged on the connecting arm 12 so as to move synchronously with the bearing plate 21; the rotating structure 3 comprises a rotating arm 31 and a transmission part 32, the rotating arm 31 is rotatably connected to the mounting part 13 about an axis in the horizontal direction, and the transmission part 32 is drivingly connected between the rotating arm 31 and the driving arm 23, so as to convert the movement of the bearing plate 21 into the rotation of the rotating arm 31; the buffering structure 4 comprises a first elastic member 41 and a second elastic member 42, the first elastic member 41 is arranged between the guide arm 22 and the connecting arm 12, and is deformed when the guide arm 22 moves away from the mounting plate 11, so as to hinder the movement of the guide arm 22, and the second elastic member 42 is arranged between the rotating arm 31 and the mounting part 13, and is deformed when the rotating arm 31 rotates, so as to drive the rotating arm 31 to return.

[0046] When the bearing plate 21 receives a downward force, the bearing plate 21 moves towards the mounting plate 11, and the driving arm 23 on the lower side of the bearing plate 21 moves downwards synchronously; the driving arm 23 can be driven by the transmission part 32 to convert the movement of the bearing plate 21 into the rotation of the rotating arm 31, and the second elastic member 42 arranged between the rotating arm 31 and the mounting part 13 is elastically deformed when the rotating arm 31 rotates, so as to generate elastic force, hinder the rotation of the rotating arm 31 and drive the rotating arm 31 to return, that is, hinder the downward movement of the bearing plate 21 and provide elastic force for the return of the bearing plate 21, and thus the first buffering is realized.

[0047] When the bearing plate 21 moves upwards to return, the guide arm 22 on the lower side of the bearing plate 21 moves synchronously, and the first elastic member 41 is elastically deformed when the guide arm 22 moves away from the mounting plate 11, so as to generate elastic force, that is, the second buffering in the reverse direction is realized, and the stable return of the bearing plate 21 is ensured.

[0048] Further, the connecting arm 12 is provided with a guide channel 12a extending away from the mounting plate 11, an end of the guide channel 12a away from the mounting plate 11 is open, and the inner wall of the guide channel 12a is provided with a stop block 121; the guide arm 22 is provided with a cooperating block 221, the cooperating block 221 is located on the side of the stop block 121 close to the mounting plate 11, wherein the first elastic member 41 is arranged between the stop block 121 and the cooperating block 221. In this embodiment, the stop block 121 and the cooperating block 221 limit the first elastic member 41, so that the first elastic member 41 only elastically deforms when the guide arm 22 moves away from the mounting plate 11, which is simple and reliable in structure, saves cost, and makes the structure more compact.

[0049] Further, the cooperating block 221 is arranged at one end of the guide arm 22 close to the mounting plate 11, and is made of rubber, so that the cooperating block 221 can play a guiding role when it moves along the direction close to and away from the mounting plate 11, and can play a buffering effect when the guide arm 22 moves to the bottom wall position of the guide channel 12a. Specifically, in this embodiment, the first elastic member 41 is a compression spring.

[0050] Further, the transmission part 32 is a transmission arm 321, one end of the transmission arm 321 is rotationally connected to the driving arm 23 about an axis in the horizontal direction, and the other end is rotationally connected to the rotating arm 31, so that the rotating arm 31 can be driven to rotate about its axis when the bearing plate 21 moves close to and away from the mounting plate 11. In this scheme, when the driving arm 23 moves downward following the bearing plate 21, the transmission arm 321 is driven to move downward synchronously, and since the lower end of the transmission arm 321 is rotationally connected to the rotating arm 31, the movement of the bearing plate 21 can be converted into the rotation of the rotating arm 31.

[0051] Further, the rotating arm 31 includes a main arm 311 and a bent arm 312, the main arm 311 is rotationally connected to the transmission arm 321, the bent arm 312 is arranged in a bent manner from one end of the main arm 311 and is rotationally connected to the mounting part 13 about an axis in the horizontal direction; the second elastic member 42 is arranged between the bent arm 312 and the mounting part 13, and deforms when the bent arm 312 rotates to drive the bent arm 312 to return. In this embodiment, the rotating arm 31 is arranged in the form of the main arm 311 and the bent arm 312 connected at an angle, so as to ensure that the rotating arm 31 can stably rotate, and then the elastic deformation of the second elastic member 42 can be used to play a buffering role, which is simple and reliable in structure.

[0052] Specifically, the mounting structure 1 further comprises a guide portion 14 and a fixing portion 15, the guide portion 14, the fixing portion 15 and the mounting portion 13 are arranged on the same side of the mounting plate 11, and the guide portion 14 and the fixing portion 15 are arranged in a horizontal direction; the quasi-zero stiffness vibration isolator 100 further comprises a movable arm 6, the movable arm 6 is located between the guide portion 14 and the fixing portion 15 and is movably arranged on the mounting plate 11 in a horizontal direction to be able to approach and move away from the guide portion 14, and a matching portion 61 is arranged on the movable arm 6; a driving portion 33 is arranged on the bending arm 312, the driving portion 33 is drivingly connected with the matching portion 61 to convert the rotation of the bending arm 312 into the movement of the movable arm 6; the buffer structure 4 further comprises a third elastic member 43 and a fourth elastic member 44, the third elastic member 43 is arranged between the movable arm 6 and the matching portion 61 to deform when the movable arm 6 moves towards the guide portion 14 to hinder the movement of the movable arm 6, and the fourth elastic member 44 is arranged between the movable arm 6 and the fixing portion 15 to deform when the movable arm 6 moves away from the guide portion 14 to hinder the movement of the movable arm 6.

[0053] In this way, when the bearing plate 21 moves downward, the bending arm 312 rotates correspondingly, at this time, the rotation of the bending arm 312 can be transmitted to the movable arm 6 through the cooperation of the driving portion 33 and the matching portion 61 to drive the movable arm 6 to move towards the guide portion 14, and then the third elastic member 43 is elastically deformed to strengthen the first buffer. When the bearing plate 21 resets, the bending arm 312 reversely rotates to drive the movable arm 6 to move away from the guide portion 14. That is, the movable arm 6 moves towards the fixing portion 15, and the fourth elastic member 44 located between the movable arm 6 and the fixing portion 15 is elastically deformed to strengthen the reverse second buffer, thereby further improving the stability of the reset of the bearing plate 21.

[0054] Further, the guide portion 14 is a slide rod 141 arranged on the connecting arm 12 in a horizontal direction, the slide rod 141 is provided with a protrusion 142, the fixing portion 15 is a fixing cylinder 151 arranged on the mounting plate 11, the fixing cylinder 151 extends in a horizontal direction; one end of the movable arm 6 close to the slide rod 141 is hingedly connected with a buffer rod 62, and the other end extends into the inner cavity of the fixing cylinder 151, the buffer rod 62 is hingedly connected with a sliding block 63 at the end away from the movable arm 6, and the sliding block 63 is slidingly arranged on the slide rod 141, wherein the third elastic member 43 is arranged between the protrusion 142 and the sliding block 63, and the fourth elastic member 44 is fixed to the inner wall of the fixing cylinder 151 and located on the side of the movable arm 6 away from the slide rod 141.

[0055] In the embodiment, when the movable arm 6 moves towards the slide rod 141, the buffer rod 62 is driven to rotate, and then the slide block 63 is driven to move upwards, so that the third elastic member 43 between the slide block 63 and the protrusion 142 is compressed to be elastically deformed. When the movable arm 6 moves away from the slide rod 141, that is, the movable arm 6 extends into the inner cavity of the fixed cylinder 151, the fourth elastic member 44 is elastically deformed.

[0056] Specifically, in the embodiment, the buffer rod 62 on the movable arm 6 is provided with two buffer rods 62, and the two buffer rods 62 are oppositely arranged on the two sides of the movable arm 6. Correspondingly, each movable arm 6 is provided with two third elastic members 43. In addition, the inner wall of the slide block 63 is fixedly sleeved with a damping sleeve, so that the slide block 63 can move more smoothly on the slide rod 141. In addition, in the scheme, the third elastic member 43 and the fourth elastic member 44 are compression springs.

[0057] Further, the bending arm 312 is provided with two bending arms 312, which are located at the two ends of the main arm 311. Correspondingly, the connecting arm 12, the slide rod 141, the third elastic member 43 and the movable arm 6 are provided with two connecting arms 12, which are arranged in the horizontal direction. Two slide rods 141, two third elastic members 43, two movable arms 6 and two connecting arms 12 correspond one by one. The end of the two movable arms 6 away from the corresponding slide rod 141 extends into the inner cavity of the fixed cylinder 151. In the embodiment, the movable arm 6 is provided with two groups to further enhance the buffering performance of the first buffering and the second buffering. In addition, the guide arm 22 and the first elastic member 41 are also provided with two respectively.

[0058] Further, the end of the bending arm 312 away from the main arm 311 extends in the horizontal direction to form an extension arm 313, and the end of the extension arm 313 away from the main arm 311 is rotationally connected to the mounting portion 13 about an axis in the horizontal direction. The second elastic member 42 is arranged between the extension arm 313 and the mounting portion 13, and the driving portion 33 is a driving conical tooth 331 arranged on the extension arm 313. The quasi-zero stiffness vibration isolator 100 further comprises a vertical rod 7 arranged on the mounting plate 11, which corresponds to the driving conical tooth 331 and is arranged to rotate about an axis in the vertical direction. The vertical rod 7 is provided with a transmission conical tooth 71 and a spur gear 72, and the transmission conical tooth 71 is engaged with the driving conical tooth 331. The matching portion 61 is a rack 611 arranged on the movable arm 6, which is engaged with the spur gear 72 to convert the rotation of the bending arm 312 into the movement of the movable arm 6. That is, in the embodiment, when the extension arm 313 rotates, it drives the vertical rod 7 to rotate through the driving conical tooth 331 and the transmission conical tooth 71, and then drives the movable arm 6 to move towards or away from the slide rod 141 under the transmission of the spur gear 72 and the rack 611. The structure is simple and compact.

[0059] Further, in the embodiment, the mounting portion 13 is a mounting shell 131 arranged on the connecting arm 12, the one end of the rotating arm 31 extends into the mounting shell 131 and is rotationally connected with the inner wall of the mounting shell 131; the second elastic member 42 is a clock spring, one end of the clock spring is fixed to the inner wall of the mounting shell 131 and the other end is fixed to the rotating arm 31. Specifically, the one end of the extension arm 313 away from the main body arm 311 rotates around the axis in the horizontal direction and is arranged in the inner wall of the mounting shell 131. In the scheme, the mounting shell 131 is provided with two mounting shells, the two mounting shells are respectively arranged on the two connecting arms 12, and correspondingly, the clock spring is provided with two clock springs, one end of each clock spring is fixed to the inner wall of the mounting shell 131 and the other end is fixed to the extension arm 313. In addition, it should be noted that in the embodiment, the axis direction of the rotating arm 31, the shaft hole direction of the transmission arm 321 and the movement direction of the movable arm 6 are parallel to each other.

[0060] Based on the above-mentioned embodiments, the specific working process of the quasi-zero stiffness vibration isolator 100 provided by the present application is as follows:

[0061] When the bearing plate 21 receives a downward force, it will move towards the mounting plate 11, and at the same time, the driving arm 23 on the lower side of the bearing plate 21 will move downward synchronously; wherein the driving arm 23 can be transmitted through the transmission arm 321 when moving downward, so as to convert the movement of the bearing plate 21 into the rotation of the rotating arm 31, and the clock spring arranged between the rotating arm 31 and the mounting shell 131 will be elastically deformed when the rotating arm 31 rotates, so as to generate elastic force, thereby hindering the rotation of the rotating arm 31 and driving the rotating arm 31 to reset, that is, hindering the downward movement of the bearing plate 21 and providing elastic force for the reset of the bearing plate 21, thereby realizing the first buffering.

[0062] When the bearing plate 21 moves upward and resets, the guide arm 22 on the lower side of the bearing plate 21 moves synchronously, and the first elastic member 41 will also be elastically deformed under the compression of the cooperation between the cooperation block 221 and the stop block 121 when the guide arm 22 moves away from the mounting plate 11, so as to generate elastic force, that is, to realize the second buffering in the opposite direction.

[0063] When the bearing plate 21 moves downward, the extension arm 313 rotates correspondingly, and at this time, the rotation of the extension arm 313 is transmitted to the vertical rod 7 through the cooperation of the driving conical teeth 331 and the transmission conical teeth 71, and then transmitted to the movable arm 6 through the cooperation of the rack 611 and the spur gear 72, so as to drive the movable arm 6 to move along the slide rod 141; and then the sliding block 63 approaches the corresponding protrusion 142 to compress the third elastic member 43, so that the third elastic member 43 is elastically deformed to strengthen the first buffering.

[0064] When the bearing plate 21 is reset, the bending arm 312 reversely rotates, and further drives the movable arm 6 to move away from the sliding rod 141. That is, the movable arm 6 moves towards the fixed cylinder 151, so that the fourth elastic member 44 between the movable arm 6 and the fixed cylinder 151 elastically deforms, thereby being capable of strengthening the reverse second buffering, and further improving the stability of the reset of the bearing plate 21.

[0065] The above merely provides the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A quasi-zero stiffness vibration isolator, characterized by, It includes: The mounting structure includes a mounting plate, a connecting arm and a mounting part, the connecting arm and the mounting part are located on the same side of the mounting plate; The bearing structure includes a bearing plate, a guide arm and a driving arm, the bearing plate is located on the side of the mounting plate provided with the connecting arm, and is spaced apart from the mounting plate and can move towards and away from the mounting plate, the guide arm and the driving arm are located on the side of the bearing plate close to the mounting plate, and the guide arm is movably arranged on the connecting arm to be synchronously movable with the bearing plate; The rotating structure includes a rotating arm and a transmission part, the rotating arm is rotatably connected to the mounting part about an axis in the horizontal direction, and the transmission part is drivingly connected between the rotating arm and the driving arm to convert the movement of the bearing plate into the rotation of the rotating arm; And, The buffer structure includes a first elastic member and a second elastic member, the first elastic member is arranged between the guide arm and the connecting arm, and is deformed when the guide arm moves away from the mounting plate to hinder the movement of the guide arm, and the second elastic member is arranged between the rotating arm and the mounting part, and is deformed when the rotating arm rotates to drive the rotating arm to reset; The transmission part is a transmission arm, one end of the transmission arm is rotatably connected to the driving arm about an axis in the horizontal direction, and the other end is rotatably connected to the rotating arm, so that the rotating arm can be driven to rotate about its own axis when the bearing plate moves towards and away from the mounting plate; The rotating arm includes a main arm and a bent arm, the main arm is rotatably connected to the transmission arm, and the bent arm is bent from one end of the main arm and rotatably connected to the mounting part about an axis in the horizontal direction; The second elastic member is arranged between the bent arm and the mounting part to be deformed when the bent arm rotates to drive the bent arm to reset; The mounting structure further includes a guide part and a fixed part, the guide part, the fixed part and the mounting part are located on the same side of the mounting plate, and the guide part and the fixed part are spaced apart in the horizontal direction; The quasi-zero stiffness vibration isolator further includes a movable arm located between the guide part and the fixed part and movably arranged on the mounting plate in the horizontal direction to be able to move towards and away from the guide part, and a matching part is arranged thereon; The bent arm is provided with a driving part, and the driving part is drivingly connected with the matching part to convert the rotation of the bent arm into the movement of the movable arm; The buffer structure further includes a third elastic member and a fourth elastic member, the third elastic member is arranged between the movable arm and the matching part to be deformed when the movable arm moves towards the guide part to hinder the movement of the movable arm, and the fourth elastic member is arranged between the movable arm and the fixed part to be deformed when the movable arm moves away from the guide part to hinder the movement of the movable arm; The guide part is a slide rod spaced apart on the connecting arm in the horizontal direction, the slide rod is provided with a protrusion, and the fixed part is a fixed cylinder arranged on the mounting plate and extending in the horizontal direction; The movable arm is hinged with a buffer rod at one end close to the slide rod, and extends into the inner cavity of the fixed cylinder at the other end, the buffer rod is hinged with a sliding block at one end away from the movable arm, the sliding block is slidingly sleeved on the slide rod, wherein the third elastic member is arranged between the protrusion and the sliding block, the fourth elastic member is fixed to the inner wall of the fixed cylinder and located on the side of the movable arm away from the slide rod; The bending arm is provided with two, two bending arms are located at both ends of the main arm, and correspondingly, the connecting arm, the slide rod, the third elastic member and the movable arm are provided with two, two connecting arms are arranged in a horizontal direction, two slide rods, two third elastic members, two movable arms and two connecting arms are one-to-one corresponding; Wherein, one end of two movable arms away from the corresponding slide rod extends into the inner cavity of the fixed cylinder; The bending arm is provided with an extension arm at one end away from the main arm and extending in a horizontal direction, the extension arm is rotatably connected to the mounting portion around an axis in a horizontal direction at one end away from the main arm, wherein the second elastic member is arranged between the extension arm and the mounting portion, and the driving portion is a driving conical tooth arranged on the extension arm; The quasi-zero stiffness vibration isolator further comprises a vertical rod arranged on the mounting plate, the vertical rod corresponds to the driving conical tooth and is rotatably arranged around an axis in a vertical direction, and a transmission conical tooth and a spur gear are arranged thereon, the transmission conical tooth is engaged with the driving conical tooth; The matching portion is a rack arranged on the movable arm, the rack is engaged with the spur gear to convert the rotation of the bending arm into the movement of the movable arm.

2. The quasi-zero stiffness isolator of claim 1, wherein The connecting arm is provided with a guide channel extending away from the mounting plate, one end of the guide channel away from the mounting plate is open, and a stop block is arranged on the inner wall thereof; The guide arm is provided with a matching block, the matching block is located on the side of the stop block close to the mounting plate, wherein the first elastic member is arranged between the stop block and the matching block.

3. The quasi-zero stiffness isolator of claim 2, wherein The matching block is arranged at one end of the guide arm close to the mounting plate, and the material thereof is rubber; The first elastic member is a compression spring.

4. The quasi-zero stiffness isolator of claim 1, wherein The mounting portion is a mounting shell arranged on the connecting arm, one end of the rotating arm extends into the mounting shell and is rotatably connected to the inner wall of the mounting shell; The second elastic member is a clockwork spring, one end of the clockwork spring is fixed to the inner wall of the mounting shell, and the other end is fixed to the rotating arm.

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