CN211550398U - Quasi-zero stiffness vibration isolator - Google Patents
Quasi-zero stiffness vibration isolator Download PDFInfo
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- CN211550398U CN211550398U CN202020004428.4U CN202020004428U CN211550398U CN 211550398 U CN211550398 U CN 211550398U CN 202020004428 U CN202020004428 U CN 202020004428U CN 211550398 U CN211550398 U CN 211550398U
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Abstract
The utility model relates to a quasi-zero rigidity isolator belongs to the vibration control field, it includes the bottom plate and with bottom plate parallel arrangement's roof, be provided with the positive rigidity mechanism and the negative rigidity mechanism of connecting bottom plate and roof between bottom plate and the roof, negative rigidity mechanism includes the elastic arm of intercrossing setting, the both ends of elastic arm are provided with first base and second base respectively, first base and second base pin joint respectively in the upper surface of bottom plate and the lower surface of roof through the pivot, the elastic arm includes that sleeve and slidable ground insert the slide bar of locating in the sleeve, first base and second base pin joint respectively in the upper surface of bottom plate and the lower surface of roof through the pivot, the slide bar of locating in the sleeve is inserted to the elastic arm including sleeve and slidable ground, the cover is equipped with first cylinder spring on the elastic arm, the both ends of first cylinder spring respectively with first base and second base fixed connection. The utility model discloses demonstrate good vibration isolation performance in the very little condition of vibration amplitude, can be applicable to the isolation slight low frequency vibration.
Description
Technical Field
The utility model relates to a vibration control field, in particular to accurate zero rigidity isolator.
Background
Vibration and shock phenomena occur widely in everyday life, industrial science and technology and defense industry, and most of them have negative effects on the performance of equipment, the comfort requirements of personnel and the like, so that effective isolation of these vibrations is required. Meanwhile, the requirements of people on vibration environment, products and structural vibration characteristics are further improved, and especially an ultra-precise vibration isolation platform needs to be established for an operating table, a high-precision instrument, a high-precision mechanical device and the like, so that low-frequency/ultra-low-frequency vibration isolation is realized, and great attenuation is realized at higher frequency. In daily life, people are most sensitive to low-frequency vibration, and can generate adverse reactions such as fatigue and anxiety when being in a low-frequency vibration environment for a long time; however, the conventional linear vibration isolator has a vibration isolation effect only when the external scrambling rate is greater than 1.4 times of the natural frequency of the vibration isolator, and the vibration control effect is limited by a structural space and stability assurance when the low/ultra-low frequency external interference is processed. Therefore, how to effectively reduce the natural frequency of the vibration isolator without damaging the original performance of the whole system is important to prevent people and other mechanical equipment from being influenced by low-frequency/ultralow-frequency vibration, but the existing vibration isolator cannot effectively isolate the low-frequency vibration between the equipment and an equipment foundation. The utility model discloses based on the principle of the nonlinear vibration isolator of the low dynamic stiffness of high static stiffness, provide a nonlinear ultralow frequency vibration isolator of shock attenuation pole and spring combination to satisfy the needs of in-service use.
SUMMERY OF THE UTILITY MODEL
In this regard, there is a need for a quasi-zero stiffness vibration isolator comprising a base plate and a top plate disposed parallel to the base plate, a positive stiffness mechanism and a negative stiffness mechanism which are used for connecting the bottom plate and the top plate are arranged between the bottom plate and the top plate, the negative stiffness mechanism comprises two elastic arms which are arranged in a crossed manner, a first base and a second base are respectively arranged at two ends of each elastic arm, the first base and the second base are respectively pivoted on the upper surface of the bottom plate and the lower surface of the top plate through rotating shafts, the elastic arm comprises a sleeve and a sliding rod which is slidably inserted in the sleeve, the first base and the second base are respectively pivoted on the upper surface of the bottom plate and the lower surface of the top plate through rotating shafts, the elastic arm comprises a sleeve and a sliding rod which is slidably inserted in the sleeve, a first cylindrical spring is sleeved on the elastic arm, and two ends of the first cylindrical spring are fixedly connected with the first base and the second base respectively.
The outer side wall of the sliding rod is attached to the inner side wall of the sleeve and matched with the inner side wall of the sleeve in a sliding mode, the sliding rod can only move back and forth along the central line of the sleeve, one end, far away from the sliding rod, of the sleeve is connected with the first base, and one end, far away from the sleeve, of the sliding rod is connected with the second base; or one end of the sleeve, which is far away from the sliding rod, is connected with the second base, and one end of the sliding rod, which is far away from the sleeve, is connected with the first base.
The utility model discloses in, the bottom plate is used for fixing the isolator on bearing structure such as ground, and the roof is used for bearing by the vibration isolator, and bottom plate and roof and be located positive rigidity mechanism and the negative stiffness mechanism in the middle of bottom plate and the roof form a quasi-zero rigidity system, and quasi-zero rigidity system is zero at the dynamic stiffness of static balance position department, can be so that its rigidity of isolator is close to for zero under the prerequisite of guaranteeing the bearing capacity to demonstrate good low frequency vibration isolation performance.
The number of the positive stiffness mechanisms is one or more, and the positive stiffness mechanisms are used for supporting and stabilizing the top plate; the quantity of burden rigidity mechanism is one or more, and its specific quantity is decided according to the quantity and the specification of positive rigidity mechanism, in order to guarantee the utility model discloses can become quasi-zero rigidity system after placing by the vibration isolator.
In the utility model, the two ends of the elastic arm are respectively pivoted on the lower surface of the top plate and the upper surface of the bottom plate, when the top plate moves down due to the bearing of the vibration-isolated object, the elastic arm tends to be parallel to the bottom plate, at the moment, the elastic arm is compressed, the first cylindrical spring on the elastic arm is compressed, the slide bar is inserted into the sleeve more deeply, namely the elastic arm deforms to generate negative rigidity, at the moment, the negative rigidity mechanism and the positive rigidity mechanism form a quasi-zero rigidity system, the vibration-isolated object in the utility model is mainly supported by the positive rigidity mechanism, the elastic arm in the negative rigidity mechanism is arranged in an inclined way, when the top plate moves downwards, the compression amount of the first cylindrical spring is larger than the moving distance of the top plate, therefore, the elastic arm in the utility model is more sensitive to rigidity, therefore, the negative rigidity mechanism in the utility model can lead the vibration isolator to show good vibration isolation performance under the condition of small vibration, can be suitable for isolating micro-amplitude low-frequency vibration; simultaneously, compare in the spring as negative stiffness structure in current isolator, the utility model provides a negative stiffness mechanism occupies installation space littleer, therefore can realize the miniaturization of isolator.
Additionally, the utility model provides a two elastic arm intercrossing settings in the negative stiffness mechanism, its torsion torque's that can avoid the isolator production, can also make the isolator be difficult for producing deformation when receiving the external force of horizontal direction simultaneously.
The first base and the second base are arranged at two ends of the elastic arm in a position-adjustable manner.
The pre-compression amount of the first cylindrical spring between the first base and the second base can be adjusted by adjusting the positions of the first base and the second base at the two ends of the elastic arm on the elastic arm, so that the adjustment of parameters of the negative stiffness mechanism can be realized, and the adjustment of parameters of the quasi-zero stiffness vibration isolator can be realized.
Wherein the adjustable structure is: the outer surface of the sleeve is provided with an external thread, the first base is provided with a threaded hole corresponding to the external thread, the sleeve is installed in the threaded hole, the position of the first base relative to the sleeve, namely the position of the first base relative to the elastic arm, can be adjusted by rotating the sleeve, the external thread is arranged on the outer surface of one side, away from the sleeve, of the sliding rod, the threaded hole is arranged on the second base corresponding to the external thread, the sliding rod is installed in the threaded hole, and the position of the second base on the sliding rod, namely the position of the second base relative to the elastic arm, can; or the outer surface of the sleeve is provided with an external thread, the second base is provided with a threaded hole corresponding to the external thread, the sleeve is installed in the threaded hole, the position of the second base relative to the sleeve, namely the position of the second base relative to the elastic arm, can be adjusted by rotating the sleeve, the external thread is arranged on the outer surface of one side, away from the sleeve, of the sliding rod, the threaded hole is formed in the first base corresponding to the external thread, the sliding rod is installed in the threaded hole, the position of the first base on the sliding rod can be adjusted by rotating the sliding rod, namely the position of the first base.
Further, positive rigidity mechanism including fixed set up in the first mount pad of the upper surface of bottom plate with fixed set up in the second mount pad of the lower surface of roof, be provided with second cylindrical spring between first mount pad and the second mount pad, the upper end and the lower extreme of second cylindrical spring respectively with second mount pad and first mount pad fixed connection.
First mount pad and second mount pad can set up respectively on bottom plate and roof through fixed connection structure such as bolted connection structure, welded connection structure, and the both ends of second cylindrical spring can be connected on first mount pad and second mount pad through fixed connection structure such as bolted connection structure or welded connection structure.
Furthermore, a first mounting hole used for mounting a first mounting seat and a second mounting seat is formed in the bottom plate and the top plate, the first mounting hole penetrates through the bottom plate or the top plate, a first threaded hole is formed in the first base and the second base corresponding to the first mounting hole, and the first mounting seat and the second mounting seat are mounted in the first mounting hole through a bolt connecting structure.
The first mounting hole can be a threaded hole, and the first mounting seat and the second mounting seat are respectively fixed on the bottom plate and the top plate through bolts which are simultaneously mounted in the first threaded hole and the first mounting hole; or the first mounting hole is a through hole, the first mounting seat and the second mounting seat are respectively mounted on the bottom plate and the top plate through a bolt-nut connecting structure, wherein the upper end or the lower end of the first mounting hole is provided with a widening hole for accommodating a nut so as to keep the lower surface of the bottom plate and the upper surface of the top plate to be flush; in addition, the first mounting seat and the second mounting seat can be respectively fixed on the bottom plate and the top plate through welding connection structures.
Further, the upper surface of bottom plate and the lower surface of roof correspond respectively first base and second base are provided with the support, the pivot is fixed set up in the support, first base and second base correspond the pivot is provided with the collar, the collar cover is located the pivot, just the inboard of collar is fixed and is provided with the rubber circle, the inboard of rubber circle with the surface counterbalance of pivot.
Wherein, the end of the rotating shaft can be provided with a blocking structure, such as a stop block, so as to prevent the mounting ring from being separated from the rotating shaft; a rubber ring is arranged between the rotating shaft and the mounting ring, so that the rotating shaft and the mounting ring can generate relative displacement within a certain range to offset the mounting error of the elastic arm.
Furthermore, a second mounting hole for mounting a support is formed in the bottom plate and the top plate, the second mounting hole penetrates through the bottom plate or the top plate, a second threaded hole is formed in the support corresponding to the second mounting hole, and the support is mounted in the second mounting hole through a bolt connecting structure.
The second mounting hole can be a threaded hole, and the bracket is fixed on the bottom plate and the top plate through bolts which are simultaneously mounted in the second threaded hole and the second mounting hole; or the second mounting hole is a through hole, the support is mounted on the bottom plate and the top plate through the bolt and nut connecting structure, wherein the widening hole used for containing the nut is formed in the upper end or the lower end of the first mounting hole, so that the lower surface of the bottom plate and the upper surface of the top plate are parallel and level.
Further, the second mounting hole comprises a round hole and a long hole, and the center of the round hole is located on the central line of the long hole in the length direction.
Wherein, the round hole and the strip hole on the top plate are arranged corresponding to the round hole and the strip hole on the bottom plate, the bracket is arranged on the round hole and the strip hole on the top plate and the bottom plate through a bolt structure, the bracket arranged in the strip hole can move along the length direction of the strip hole in the strip hole so as to adjust the position of the bracket, two ends of one elastic arm in the negative stiffness mechanism are respectively pivoted on the bracket in the round hole on the top plate and the bracket in the strip hole on the bottom plate, two ends of the other elastic arm are respectively pivoted on the bracket in the strip hole on the top plate and the bracket in the round hole on the bottom plate, at the moment, the two elastic arms are arranged in a crossed way without mutual contact, the length of the elastic arm can be adjusted by adjusting the position of the bracket in the elongated hole so as to adjust the compression amount of the spring, therefore, the purpose of adjusting the parameters of the negative stiffness mechanism so that the vibration isolator can provide good vibration isolation performance under different loads is achieved.
Furthermore, a limiting mechanism used for limiting the moving stroke of the top plate relative to the bottom plate is further arranged between the bottom plate and the top plate.
The limiting mechanism is used for limiting the maximum stroke of the top plate relative to the bottom plate so as to prevent the negative stiffness mechanism from being damaged due to the fact that the top plate is excessively formed.
Furthermore, stop gear including fixed set up in spacing support on the bottom plate with fixed set up in gag lever post on the roof, the bottom of spacing support is provided with the lantern ring, the upper end of gag lever post is passed the lantern ring sets up, just spacing top is provided with the stop part, the width of stop part is greater than the internal diameter of the lantern ring, the lantern ring orientation one side of stop part still is provided with damping rubber.
The limiting rod and the limiting support are respectively fixedly connected with the top plate and the bottom plate through a bolt connecting structure or a welding structure, the stop ring limits upward movement of the stop part, so that the top plate is limited relative to the upward movement stroke of the bottom plate, the top of the limiting rod can limit the downward movement stroke of the top plate, and the damping rubber is used for buffering impact of the sleeve ring and the stop part.
Furthermore, the blocking part is arranged on the limiting rod in a position-adjustable manner.
The upper portion of the limiting rod is provided with external threads, the blocking portion is a nut, the blocking portion is installed on the upper portion of the limiting rod, the position of the blocking portion can be adjustably arranged on the limiting rod, and the maximum stroke of the top plate relative to the bottom plate can be adjusted by adjusting the position of the blocking portion on the limiting rod.
The principle and effect of the present invention will be further explained below with reference to the above technical solutions and the accompanying drawings:
the utility model is mainly supported by the positive stiffness mechanism, and the elastic arm in the negative stiffness mechanism is inclined, when the top plate moves downwards, the compression amount of the first cylindrical spring is larger than the moving distance of the top plate, namely, the elastic arm in the utility model is more sensitive to the stiffness, therefore, the negative stiffness mechanism in the utility model can lead the vibration isolator to show good vibration isolation performance under the condition of very small vibration amplitude, and can be suitable for isolating micro-amplitude low-frequency vibration; simultaneously, compare in the spring as negative stiffness structure in current isolator, the utility model provides a negative stiffness mechanism occupies installation space littleer, therefore can realize the miniaturization of isolator.
Drawings
Fig. 1 is a schematic sectional structural view of a quasi-zero stiffness vibration isolator according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a bottom plate according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of the elastic arm according to the embodiment of the present invention.
Description of reference numerals:
1-bottom plate, 11-first mounting hole, 121-round hole, 122-elongated hole, 13-third mounting hole, 2-top plate, 31-first mounting seat, 32-second mounting seat, 33-second cylindrical spring, 41-elastic arm, 411-sleeve, 412-sliding rod, 42-first cylindrical spring, 43-second base, 44-first base, 45-bracket, 46-mounting ring, 461-rubber ring, 51-limiting rod, 511-blocking part, 52-limiting bracket and 521-lantern ring.
Detailed Description
To facilitate understanding of those skilled in the art, the present invention will be described in further detail with reference to the accompanying drawings and examples:
referring to fig. 1-3, a quasi-zero stiffness vibration isolator includes a bottom plate 1 and a top plate 2 disposed parallel to the bottom plate 1, a positive stiffness mechanism and a negative stiffness mechanism for connecting the bottom plate 1 and the top plate 2 are disposed between the bottom plate 1 and the top plate 2, the negative stiffness mechanism includes two elastic arms 41 disposed in a cross manner, a first base 44 and a second base 43 are disposed at two ends of each elastic arm 41, the first base 44 and the second base 43 are respectively pivoted to an upper surface of the bottom plate 1 and a lower surface of the top plate 2 through a rotating shaft, the elastic arms 41 include a sleeve 411 and a sliding rod 412 slidably inserted into the sleeve 411, the elastic arm 41 is sleeved with a first cylindrical spring 42, and two ends of the first cylindrical spring 42 are respectively fixedly connected with the first base 44 and the second base 43.
The outer side wall of the sliding rod 412 is attached to the inner side wall of the sleeve 411 and slidably engaged with the inner side wall, the sliding rod 412 can only reciprocate along the center line of the sleeve 411, one end of the sleeve 411 far away from the sliding rod 412 is connected with the first base 44, and one end of the sliding rod 412 far away from the sleeve 411 is connected with the second base 43. In another embodiment, the end of the sleeve 411 remote from the sliding bar 412 is connected to the second base 43, and the end of the sliding bar 412 remote from the sleeve 411 is connected to the first base 44.
The bottom plate 1 is used for fixing the vibration isolator on bearing structures such as a foundation, the top plate 2 is used for bearing a vibration-isolated object, the bottom plate 1, the top plate 2, the positive stiffness mechanism and the negative stiffness mechanism which are positioned between the bottom plate 1 and the top plate 2 form a quasi-zero stiffness system, the dynamic stiffness of the quasi-zero stiffness system at a static balance position is zero, the stiffness of the vibration isolator can be close to zero on the premise of ensuring the bearing capacity, and therefore excellent low-frequency vibration isolation performance is shown.
The number of the positive stiffness mechanisms is four, the positive stiffness mechanisms are distributed at four sharp corners of the square bottom plate 1 and are symmetrically distributed about a central line of the bottom plate 1 in the vertical direction, and the positive stiffness mechanisms are used for supporting the top plate 2 and enabling the top plate 2 to be stable; the number of the negative stiffness mechanisms is two, and the negative stiffness mechanisms are symmetrically distributed around a center line of the bottom plate 1 in the vertical direction. In another embodiment, the number of positive stiffness mechanisms is three, which are symmetrically distributed about the vertical center line of the base plate 1, and the number of negative stiffness mechanisms is two, which are symmetrically distributed about the vertical center line of the base plate 1.
The two ends of the elastic arm 41 are respectively pivoted to the lower surface of the top plate 2 and the upper surface of the bottom plate 1, when the top plate 2 moves down due to the vibration-isolating object, the elastic arm 41 tends to be parallel to the bottom plate 1, at this time, the elastic arm 41 is compressed, the first cylindrical spring 42 on the elastic arm 41 is compressed, the slide rod 412 is inserted into the sleeve 411 more deeply, i.e. the elastic arm 41 deforms to generate negative stiffness, at this time, the negative stiffness mechanism and the positive stiffness mechanism form a quasi-zero stiffness system, and the vibration-isolating object of the present invention is mainly supported by the positive stiffness mechanism, and the elastic arm 41 in the negative stiffness mechanism is inclined, when the top plate 2 moves down, the compression amount of the first cylindrical spring 42 is greater than the moving distance of the top plate 2, therefore, the elastic arm 41 in the present invention is more sensitive to the stiffness of the vibration isolator, therefore, the negative stiffness mechanism in the present invention can make the vibration-isolating performance be exhibited under the condition of, can be suitable for isolating micro-amplitude low-frequency vibration; simultaneously, compare in the spring as negative stiffness structure in current isolator, the utility model provides a negative stiffness mechanism occupies installation space littleer, therefore can realize the miniaturization of isolator.
Additionally, the utility model provides a two elastic arm 41 intercrossing settings in the negative stiffness mechanism, its torsion torque's that can avoid the isolator production, can also make the isolator be difficult for producing deformation when receiving the external force of horizontal direction simultaneously.
The first base 44 and the second base 43 are disposed at two ends of the elastic arm 41 in a position-adjustable manner.
By adjusting the positions of the first pedestal 44 and the second pedestal 43 at the two ends of the elastic arm 41 on the elastic arm 41, the pre-compression amount of the first cylindrical spring 42 between the first pedestal 44 and the second pedestal 43 can be adjusted, so that the adjustment of the parameters of the negative stiffness mechanism and the adjustment of the parameters of the quasi-zero stiffness vibration isolator can be realized.
Wherein the adjustable structure is: the outer surface of the sleeve 411 is provided with an external thread, the first base 44 is provided with a threaded hole corresponding to the external thread, the sleeve 411 is installed in the threaded hole, the position of the first base 44 relative to the sleeve 411, namely the position of the first base 44 relative to the elastic arm 41, can be adjusted by rotating the sleeve 411, the outer surface of one side of the sliding rod 412 away from the sleeve 411 is provided with an external thread, the second base 43 is provided with a threaded hole corresponding to the external thread, the sliding rod 412 is installed in the threaded hole, and the position of the second base 43 on the sliding rod 412, namely the position of the second base 43 relative to the elastic arm 41, can be adjusted by. In another embodiment, the adjustable structure is: the outer surface of the sleeve 411 is provided with an external thread, the second base 43 is provided with a threaded hole corresponding to the external thread, the sleeve 411 is installed in the threaded hole, the position of the second base 43 relative to the sleeve 411, namely the position of the second base 43 relative to the elastic arm 41, can be adjusted by rotating the sleeve 411, the outer surface of one side of the sliding rod 412 away from the sleeve 411 is provided with an external thread, the first base 44 is provided with a threaded hole corresponding to the external thread, the sliding rod 412 is installed in the threaded hole, and the position of the first base 44 on the sliding rod 412, namely the position of the first base 44 relative to the elastic arm 41, can be adjusted by.
The positive stiffness mechanism comprises a first mounting seat 31 fixedly arranged on the upper surface of the bottom plate 1 and a second mounting seat 32 fixedly arranged on the lower surface of the top plate 2, a second cylindrical spring 33 is arranged between the first mounting seat 31 and the second mounting seat 32, and the upper end and the lower end of the second cylindrical spring 33 are fixedly connected with the second mounting seat 32 and the first mounting seat 31 respectively.
The first mounting seat 31 and the second mounting seat 32 are respectively arranged on the bottom plate 1 and the top plate 2 through a bolt connection structure, and two ends of the second cylindrical spring 33 are connected on the first mounting seat 31 and the second mounting seat 32 through a bolt connection structure. In another embodiment, the first and second mounting seats 31 and 32 are respectively disposed on the bottom plate 1 and the top plate 2 by a welded connection structure, and both ends of the second cylindrical spring 33 are connected to the first and second mounting seats 31 and 32 by a welded connection structure.
The bottom plate 1 with set up the first mounting hole 11 that is used for installing first mount pad 31 and second mount pad 32 on the roof 2, first mounting hole 11 runs through bottom plate 1 or roof 2 sets up, first base 44 and second base 43 correspond first mounting hole 11 is provided with first screw hole, first mount pad 31 and second mount pad 32 pass through bolted connection structure install in first mounting hole 11.
The first mounting holes 11 are threaded holes, and the first mounting seat 31 and the second mounting seat 32 are fixed to the bottom plate 1 and the top plate 2 by bolts simultaneously mounted in the first threaded holes and the first mounting holes 11, respectively. In another embodiment, the first mounting hole 11 is a through hole, and the first mounting seat 31 and the second mounting seat 32 are respectively mounted on the bottom plate 1 and the top plate 2 through a bolt-and-nut connection structure, wherein a widened hole for accommodating a nut is formed at an upper end or a lower end of the first mounting hole 11 to maintain the lower surface of the bottom plate 1 and the upper surface of the top plate 2 to be flush. In another embodiment, the first and second mounting seats 31 and 32 are fixed to the bottom plate 1 and the top plate 2, respectively, by a welded connection structure.
The upper surface of bottom plate 1 and the lower surface of roof 2 correspond respectively first base 44 and second base 43 are provided with support 45, the pivot is fixed set up in support 45, first base 44 and second base 43 correspond the pivot is provided with collar 46, collar 46 cover is located the pivot, just the inboard of collar 46 is fixed and is provided with rubber circle 461, the inboard of rubber circle 461 with the surface of pivot offsets.
Wherein, the end of the rotating shaft is provided with a blocking structure, such as a stopper, to prevent the mounting ring 46 from being separated from the rotating shaft; a rubber ring 461 is arranged between the rotating shaft and the mounting ring 46, so that the rotating shaft and the mounting ring 46 can be relatively displaced within a certain range to offset the mounting error of the elastic arm 41.
The bottom plate 1 with set up the second mounting hole that is used for installing support 45 on the roof 2, the second mounting hole runs through bottom plate 1 or roof 2 setting, support 45 corresponds the second mounting hole is provided with the second screw hole, support 45 pass through bolted connection structure install in the second mounting hole.
The second mounting holes are threaded holes, and the bracket 45 is fixed to the bottom plate 1 and the top plate 2 by bolts simultaneously mounted in the second threaded holes and the second mounting holes. In another embodiment, the second mounting holes are through holes, and the bracket 45 is mounted on the bottom plate 1 and the top plate 2 through a bolt-and-nut connection structure, wherein the upper end or the lower end of the first mounting hole 11 is provided with a widening hole for receiving a nut so as to keep the lower surface of the bottom plate 1 and the upper surface of the top plate 2 flush.
The second mounting hole includes a circular hole 121 and an elongated hole 122, and a center of the circular hole 121 is located on a center line of the elongated hole 122 in a length direction.
Wherein, the round hole 121 and the elongated hole 122 on the top plate 2 are arranged corresponding to the round hole 121 and the elongated hole 122 on the bottom plate 1, the brackets 45 are mounted on the round hole 121 and the elongated hole 122 on the top plate 2 and the bottom plate 1 through bolt structures, the bracket 45 mounted in the elongated hole 122 can move in the elongated hole 122 along the length direction of the elongated hole 122 so as to adjust the position of the bracket 45, two ends of one elastic arm 41 in the negative stiffness mechanism are respectively pivoted on the bracket 45 in the round hole 121 on the top plate 2 and the bracket 45 in the elongated hole 122 on the bottom plate 1, two ends of the other elastic arm 41 are respectively pivoted on the bracket 45 in the elongated hole 122 on the top plate 2 and the bracket 45 in the round hole 121 on the bottom plate 1, at this time, the two elastic arms 41 are crosswise arranged without contacting each other, and further, the length of the elastic arm 41 can be adjusted by adjusting the position of the bracket 45 in the elongated hole 122 so as to adjust the compression amount of, therefore, the purpose of adjusting the parameters of the negative stiffness mechanism so that the vibration isolator can provide good vibration isolation performance under different loads is achieved.
And a limiting mechanism for limiting the moving stroke of the top plate 2 relative to the bottom plate 1 is further arranged between the bottom plate 1 and the top plate 2.
The limiting mechanism is used for limiting the maximum stroke of the top plate 2 relative to the bottom plate 1 so as to prevent the negative stiffness mechanism from being damaged due to the fact that the top plate 2 is excessively formed.
The limiting mechanism comprises a limiting support 52 fixedly arranged on the bottom plate 1 and a limiting rod 51 fixedly arranged on the top plate 2, a lantern ring 521 is arranged at the bottom end of the limiting support 52, the upper end of the limiting rod 51 penetrates through the lantern ring 521, a blocking portion 511 is arranged at the limiting top, the width of the blocking portion 511 is larger than the inner diameter of the lantern ring 521, and damping rubber is further arranged on one side, facing the blocking portion 511, of the lantern ring 521.
The bottom plate 1 is provided with a third mounting hole 13 penetrating through the bottom plate 1, the third mounting hole 13 is a threaded hole, the lower end of the limiting rod 51 is provided with threads corresponding to the third mounting hole 13 and is mounted in the third mounting hole 13 through the threads, the top plate 2 is provided with a fourth mounting hole penetrating through the bottom plate 1, the upper end of the limiting rod 51 is provided with threads corresponding to the fourth mounting hole and is mounted in the fourth mounting hole through the threads, wherein the stop ring limits the upward movement of the blocking part 511, so that the upward movement stroke of the top plate 2 relative to the bottom plate 1 is limited, the top of the limiting rod 51 can limit the downward movement stroke of the top plate 2, and the damping rubber is used for buffering the impact of the sleeve ring 521 and the blocking part 511.
The blocking portion 511 is adjustably disposed on the limiting rod 51.
The upper part of the limiting rod 51 is provided with external threads, the blocking part 511 is a nut, and the blocking part 511 is installed on the upper part of the limiting rod 51, so that the position of the blocking part 511 can be adjustably arranged on the limiting rod 51, and the maximum stroke of the top plate 2 relative to the bottom plate 1 can be adjusted by adjusting the position of the blocking part 511 on the limiting rod 51.
The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. The utility model provides a quasi-zero rigidity isolator, including the bottom plate and with bottom plate parallel arrangement's roof, the bottom plate with be provided with the connection between the roof positive rigidity mechanism and the negative rigidity mechanism of bottom plate and roof, a serial communication port, negative rigidity mechanism includes the elastic arm of two cross arrangement, the both ends of elastic arm are provided with first base and second base respectively, first base and second base through the pivot respectively the pin joint in the upper surface of bottom plate and the lower surface of roof, the elastic arm includes sleeve and slidable ground and inserts and locate slide bar in the sleeve, the cover is equipped with first cylinder spring on the elastic arm, first cylinder spring's both ends respectively with first base and second base fixed connection.
2. The quasi-zero stiffness vibration isolator of claim 1 wherein the first and second mounts are positionally adjustable at both ends of the spring arm.
3. The quasi-zero stiffness vibration isolator according to claim 1, wherein the positive stiffness mechanism comprises a first mounting seat fixedly arranged on the upper surface of the bottom plate and a second mounting seat fixedly arranged on the lower surface of the top plate, a second cylindrical spring is arranged between the first mounting seat and the second mounting seat, and the upper end and the lower end of the second cylindrical spring are fixedly connected with the second mounting seat and the first mounting seat respectively.
4. The quasi-zero stiffness vibration isolator according to claim 1, wherein first mounting holes for mounting a first mounting seat and a second mounting seat are formed in the bottom plate and the top plate, the first mounting holes are formed through the bottom plate or the top plate, first threaded holes are formed in the first base and the second base corresponding to the first mounting holes, and the first mounting seat and the second mounting seat are mounted in the first mounting holes through a bolt connection structure.
5. The quasi-zero stiffness vibration isolator according to claim 1, wherein a bracket is disposed on the upper surface of the bottom plate and the lower surface of the top plate corresponding to the first base and the second base, respectively, the rotating shaft is fixedly disposed on the bracket, a mounting ring is disposed on the first base and the second base corresponding to the rotating shaft, the mounting ring is sleeved on the rotating shaft, a rubber ring is fixedly disposed on the inner side of the mounting ring, and the inner side of the rubber ring abuts against the surface of the rotating shaft.
6. The quasi-zero stiffness vibration isolator according to claim 5, wherein the bottom plate and the top plate are provided with second mounting holes for mounting a bracket, the second mounting holes are arranged to penetrate through the bottom plate or the top plate, the bracket is provided with second threaded holes corresponding to the second mounting holes, and the bracket is mounted in the second mounting holes through a bolt connection structure.
7. The quasi-zero stiffness vibration isolator of claim 6 wherein the second mounting hole includes a round hole and an elongated hole, the round hole having a center located on a lengthwise centerline of the elongated hole.
8. The quasi-zero stiffness vibration isolator of claim 1 wherein a stop mechanism is further disposed between the bottom plate and the top plate for limiting the travel of the top plate relative to the bottom plate.
9. The quasi-zero stiffness vibration isolator according to claim 8, wherein the limiting mechanism comprises a limiting bracket fixedly arranged on the bottom plate and a limiting rod fixedly arranged on the top plate, a sleeve ring is arranged at the bottom end of the limiting bracket, the upper end of the limiting rod passes through the sleeve ring, a blocking part is arranged at the top of the limiting bracket, the width of the blocking part is larger than the inner diameter of the sleeve ring, and damping rubber is further arranged on one side of the sleeve ring, which faces the blocking part.
10. The quasi-zero stiffness vibration isolator of claim 9 wherein the blocking portion is positionally adjustable to the limit post.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020004428.4U CN211550398U (en) | 2020-01-02 | 2020-01-02 | Quasi-zero stiffness vibration isolator |
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| CN113357308A (en) * | 2021-07-14 | 2021-09-07 | 吉林大学 | High-efficient low frequency vibration isolation device |
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