CN211648916U - Quasi-zero stiffness vibration isolator - Google Patents
Quasi-zero stiffness vibration isolator Download PDFInfo
- Publication number
- CN211648916U CN211648916U CN201922339490.9U CN201922339490U CN211648916U CN 211648916 U CN211648916 U CN 211648916U CN 201922339490 U CN201922339490 U CN 201922339490U CN 211648916 U CN211648916 U CN 211648916U
- Authority
- CN
- China
- Prior art keywords
- same structure
- holes
- hole
- short
- vertical shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Vibration Prevention Devices (AREA)
Abstract
The utility model discloses a quasi-zero stiffness vibration isolator, which overcomes the problem that a linear vibration isolation system can not reduce the initial vibration isolation frequency while maintaining the necessary bearing capacity, and comprises a negative stiffness mechanism and a positive stiffness mechanism; the negative stiffness mechanism comprises 2 sets of joint fixing structures, a supporting structure, a plate spring, a bottom plate, 4 linear bearings, 2 bearing connecting blocks, an objective table and a neck flange, 4 short pins and 5 No. 2 short shafts; 2 sets of joint fixing structures are arranged between two sides of a vertical shaft and 2 transverse shafts in the supporting structure, one end of a short rod of each set of joint fixing structure is connected with the 2 transverse shafts through a linear bearing in a bearing connecting block, and the lower end of a long rod of each set of joint fixing structure is connected with a bottom plate which is sleeved at the lower end of the vertical shaft and is positioned above a fixed block through a short pin; the superposed neck flange and the plate spring are connected with an objective table bolt, and the neck flange is in threaded connection with the top end of the vertical shaft; the positive rigidity mechanism is sleeved on the vertical shaft, the top end of the positive rigidity mechanism is contacted with the bottom ends of the 4 cross connectors, and the bottom ends of the positive rigidity mechanism are installed on the bottom plate.
Description
Technical Field
The utility model relates to a belong to the device in low frequency vibration isolation field, more precisely, the utility model relates to a parallelly connected non-linear accurate zero rigidity isolator of positive and negative rigidity.
Background
In practical engineering, some high-precision mechanical equipment needs to isolate vibration transmitted from a foundation to the equipment in use so as to ensure necessary precision of the equipment, and in order to isolate the vibration, a traditional vibration isolation method is to add a spring and a rubber pad (damping) at the joint of the equipment and a supporting structure for linear vibration isolation. As known from vibration theory, the initial vibration isolation frequency of the linear vibration isolation method is the natural frequency
And (4) doubling. Therefore, to realize vibration isolation in a lower frequency range, only the natural frequency of the vibration isolation system can be reduced, and for a linear vibration isolation system, the rigidity is reduced, but the low rigidity can cause the system to generate larger static displacement. The quasi-zero stiffness vibration isolator realizes low dynamic stiffness of the whole vibration isolation system by utilizing the parallel connection of the positive stiffness mechanism and the negative stiffness mechanism, and then, the low dynamic stiffness is expressed according to the natural frequency of the vibration isolation system
The reduced stiffness allows the vibration isolation system to have a lower natural frequency. Compared with a linear vibration isolation system with the same static bearing capacity, the quasi-zero stiffness vibration isolator has an isolation effect on vibration in a lower frequency domain, keeps higher static stiffness and can bear a load with certain weight.
Disclosure of Invention
The utility model aims to solve the technical problem that the linear vibration isolation system who has overcome prior art existence can not reduce the problem of originated vibration isolation frequency when keeping necessary bearing capacity, provides a quasi-zero rigidity isolator.
In order to solve the technical problem, the utility model discloses an adopt following technical scheme to realize: the quasi-zero stiffness vibration isolator comprises a negative stiffness mechanism and a positive stiffness mechanism;
the negative stiffness mechanism comprises 2 sets of joint fixing structures with the same structure, a supporting structure, a plate spring, a bottom plate, 4 linear bearings with the same structure, 2 bearing connecting blocks with the same structure, an objective table, a neck flange, 4 short pins with the same structure and 5 short shafts No. 2 with the same structure;
the positive stiffness mechanism comprises a spring, a No. 1 spring base and a No. 2 spring base;
the 2 sets of fixed joint structures with the same structure are symmetrically arranged at the left side and the right side of a vertical shaft in the supporting structure and are positioned between 2 cross shafts with the same structure in the supporting structure, one end of a short rod in the 2 sets of fixed joint structures with the same structure is sleeved and connected with the 2 cross shafts with the same structure through a linear bearing arranged in a bearing connecting block, and the lower end of a long rod in the 2 sets of fixed joint structures with the same structure is connected with a bottom plate which is sleeved at the lower end of the vertical shaft and is positioned above a fixed block in the supporting structure through a short pin; the neck flange and the plate spring which are overlapped from bottom to top are connected with the objective table through bolts, the neck flange is in threaded connection with the top end of the vertical shaft, and the bottom end face of the plate spring is in contact connection with 4 bearings with the same structure in 2 sets of fixed joint structures with the same structure; the positive stiffness mechanism is sleeved on the vertical shaft, the top end of the positive stiffness mechanism is in contact connection with the bottom end faces of 4 cross connectors which are identical in structure and arranged in the middle of 2 transverse shafts, the bottom end of the positive stiffness mechanism is installed on the bottom plate through the No. 2 spring base, and the springs are installed between the No. 1 spring base and the No. 2 spring base.
The joint fixing structure in the technical scheme further comprises 3I-shaped joints with the same structure, 3Y-shaped joints with the same structure, 2 circular pipe clamps with the same structure, a No. 1 short shaft and a fixing rod; two ends of the long rod are in threaded connection with 2 'I' -shaped joints with the same structure; the two ends of the short rod and the I-shaped joint are in threaded connection with the Y-shaped joint; two ends of the fixed rod are in threaded connection with 2 'Y' -shaped joints with the same structure; one end of the long rod is connected with one end of the short rod provided with the Y-shaped joint by a No. 1 short shaft, and 2 bearings with the same structure are sleeved on two ends of the No. 1 short shaft extending out of the Y-shaped unthreaded hole on the Y-shaped joint; two ends of the fixed rod are connected with one ends of 2 circular pipe clamps which are sleeved on the long rod and the short rod and have the same structure through 2Y-shaped joints which have the same structure by short pins.
The supporting structure in the technical scheme also comprises 4I-shaped joints with the same structure, 9 cross connectors with the same structure and two same fixed shafts; 3 No. 2 short shafts with the same structure are respectively fixed at the left end, the right end and the middle position of two transverse shafts with the same structure in parallel through 2 vertically arranged cross connectors with the same structure; specifically, the method comprises the following steps: the two ends of the No. 2 short shaft are respectively and vertically connected with 2 cross shafts with the same structure through cross connectors, wherein the No. 2 short shaft fixed at the middle position of the two cross shafts with the same structure is vertically and crossly connected with the vertical shaft space through 1 cross connector which is transversely arranged, so that the 2 cross shafts with the same structure are fixed at the front side and the rear side of the vertical shaft in parallel and in alignment and are vertically crossed in space; the two cross connectors fixed on the right side of the vertical shaft in the middle positions of the 2 transverse shafts with the same structure are used for forming a bottom plane with the two cross connectors fixed on the left side of the vertical shaft in the middle positions of the 2 transverse shafts with the same structure, and the bottom plane is in contact connection with the No. 1 spring base;
one end of each of 2 fixed shaft connection I 'type joints with the same structure is connected with two ends of the fixed block by adopting 2 short pins with the same structure, the other end of each fixed shaft connection I' type joint with the same structure is connected with 2 short shafts with the same structure and 2 symmetrical cross connectors with the same structure, which are arranged at two ends of each cross shaft with the same structure, the upper end of each vertical shaft is in threaded connection with the flange with the neck, and the lower end of each vertical shaft is in threaded connection with the fixed block.
According to the technical scheme, the cross connector is a cuboid-shaped structural member, optical through holes with the same structure are arranged at two ends of the cross connector, the revolution axes of the optical through holes with the same structure are perpendicular to each other in a spatial crossing mode, the distances between the revolution axes of the optical through holes with the same structure and the left end face and the right end face are equal, gaps with the same thickness are arranged along the radial direction of the optical through holes with the same structure and perpendicular to the left end face and the right end face, the gaps are communicated with the optical through holes with the same structure, a threaded hole is formed in one side wall of two side walls of each gap, an optical hole for mounting a bolt is formed in the other side wall of the two side walls of each gap, and the bolt is inserted into the optical through hole in one side wall and then connected with the.
The fixing block is a cuboid structural member, two ends of the fixing block are symmetrically provided with 'U' -shaped grooves with the same structure, groove walls of 2 'U' -shaped grooves with the same structure are symmetrically provided with optical through holes with collinear rotation axes, the center of the fixing block is provided with a central threaded hole matched with the threaded end part of the vertical shaft, and the rotation axes of the central threaded hole and the rotation axes of the optical through holes arranged on the groove walls of the 'U' -shaped grooves at the two ends of the fixing block are in spatial crossing and vertical.
The bottom plate in the technical scheme comprises a base and 4 lugs with the same structure; the base is a rectangular plate, a 2-section stepped through hole is formed in the center of the base, the diameter of the small-diameter section light through hole is equal to that of the vertical shaft, the small-diameter section light through hole and the vertical shaft are in sliding fit, the large-diameter section light hole is equal to the outer diameter of the No. 2 spring base, 4 light through holes are symmetrically formed in the periphery of the 2-section stepped through hole, and the central connecting line of the 4 light through holes is a quadrangle which has the same symmetrical axis with the base; the lug is a rectangular plate, one end of the lug is provided with a light through hole, the distance from the rotating axis of the light through hole to the other end of the lug, namely the installed base is large, 4 rectangular lugs with the same structure are vertically installed on the base, and the 4 rectangular lugs with the same structure are arranged in parallel and symmetrically relative to the longitudinal and transverse symmetrical lines of the base.
The bearing connecting block in the technical scheme is a U-shaped structural member, a groove is arranged at the upper end of the bearing connecting block, groove wall smooth through holes with collinear rotation axes are arranged on two groove walls, 2 groove bottom wall smooth through holes with the same structure and parallel and symmetrical rotation axes are arranged on the groove bottom wall of the bearing connecting block, the diameter of each groove bottom wall smooth through hole is equal to the outer diameter of a ring body in the linear bearing with the flange, and threaded connecting holes are respectively arranged above and below the 2 groove bottom wall smooth through holes; the 2 threaded connection holes are aligned with the 2 optical through holes on the flange seat in the linear bearing with the flange.
In the technical scheme, the No. 1 spring base comprises a No. 1 bottom disc and a No. 1 hollow cylinder; the center of the No. 1 bottom disc is provided with a No. 1 smooth through hole, the diameter of the No. 1 smooth through hole is equal to that of the vertical shaft, the No. 1 smooth through hole and the vertical shaft are assembled, and the bottom surface of the No. 1 bottom disc is in contact with a plane formed by the bottom end surfaces of 4 cross connectors with the same structure and fixed in the middle of 2 transverse shafts with the same structure; the outer diameter of the No. 1 hollow cylinder is equal to the inner diameter of the spring; one end of the No. 1 hollow cylinder is connected with the upper surface of the No. 1 bottom disc into a whole, and the rotation axes of the No. 1 hollow cylinder, the No. 1 smooth through hole and the No. 1 bottom disc are collinear.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the quasi-zero stiffness vibration isolator can meet the requirements of high static stiffness and low dynamic stiffness, and widens the vibration isolation frequency range while maintaining the bearing capacity;
2. a quasi-zero rigidity isolator compare in other quasi-zero rigidity isolators have wideer quasi-zero rigidity interval, also have better isolation to the vibration of the big amplitude of low frequency.
Drawings
The invention will be further described with reference to the accompanying drawings:
figure 1 is a perspective view of an axis of a quasi-zero stiffness vibration isolator structure component
FIG. 2 is a perspective view of the axis of the fixed joint structure used in the quasi-zero stiffness vibration isolator
Fig. 3 is an axonometric view of the structural components of the supporting structure used in the quasi-zero stiffness vibration isolator according to the present invention;
fig. 4 is an axonometric view of the bottom plate structure used in the quasi-zero stiffness vibration isolator according to the present invention;
fig. 5 is an axonometric view of the structure of the bearing connecting block used in the quasi-zero stiffness vibration isolator according to the present invention;
fig. 6 is an axonometric view of the structure of the plate spring used in the quasi-zero stiffness vibration isolator according to the present invention;
fig. 7 is an axonometric view of the structure of the No. 2 spring support seat employed in the quasi-zero stiffness vibration isolator according to the present invention;
fig. 8 is an axonometric view of the structure of the hubbed flange used in a quasi-zero stiffness vibration isolator according to the present invention;
fig. 9 is an axonometric view of the structure of the spring support seat No. 1 employed in the quasi-zero stiffness vibration isolator according to the present invention;
fig. 10 is an axonometric view of the structure of the flanged linear bearing employed in the quasi-zero stiffness vibration isolator according to the present invention;
fig. 11 is an axonometric view of the structure of the stage employed in the quasi-zero stiffness vibration isolator according to the present invention;
fig. 12 is an axonometric view of the structure of the 'Y' joint used in the quasi-zero stiffness vibration isolator according to the present invention;
fig. 13 is an axonometric view of the structure of the 'I' joint used in the quasi-zero stiffness vibration isolator according to the present invention;
fig. 14 is an axonometric view of the round tube clamp structure employed in the quasi-zero stiffness vibration isolator according to the present invention;
fig. 15 is an axonometric view of the structure of the cross connector used in the quasi-zero stiffness vibration isolator according to the present invention;
fig. 16 is an axonometric view of the structure of the fixing block used in the quasi-zero stiffness vibration isolator according to the present invention;
fig. 17 is a static force characteristic curve of a quasi-zero stiffness vibration isolator according to the present invention;
in the figure: 1. the bearing comprises a fixed joint structure, a support structure 2, a plate spring 3, a bottom plate 4, a flanged linear bearing 5, a bearing connecting block 6, a carrying table 7, a neck flange 8, a spring 9, a spring base 101.1, a spring base 102.2, an I-shaped joint 11, a Y-shaped joint 12, a round pipe clamp 13, a long rod 14, a short rod 15, a short shaft 16.1, a rolling bearing 17, a fixing rod 18, a cross connector 19, a fixing block 20, a short shaft 21.2, a short pin 22, a vertical shaft 23, a horizontal shaft 24 and a fixing shaft 25.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings:
a quasi-zero rigidity isolator include negative stiffness mechanism and positive stiffness mechanism.
1. Referring to fig. 1, the negative stiffness mechanism includes 2 sets of joint fixing structures 1 with the same structure, a support structure 2, a plate spring 3, a bottom plate 4, 4 linear bearings 5 with the same structure, 2 bearing connecting blocks 6 with the same structure, an object stage 7, a neck flange 8, 4 short pins 22 with the same structure, and 5 short shafts 21 with the same structure No. 2.
Referring to fig. 2, the fixed joint structure 1 includes 3 'I' -shaped joints 11 with the same structure, 3 'Y' -shaped joints 12 with the same structure, 2 circular tube clamps 13 with the same structure, a long rod 14, a short rod 15, a No. 1 short shaft 16, 2 bearings 17 with the same structure, and a fixing rod 18;
the I-shaped joint 11 is an SC series cylinder joint standard component and is integrally a cylindrical structural component, one end of the I-shaped joint 11 is parallel to an axis and symmetrically provided with two spot-facing planes, an I-shaped light through hole is arranged perpendicular to the spot-facing planes, and an I-shaped threaded blind hole is arranged on a longitudinal rotating axis at the other end of the I-shaped joint 11.
The Y-shaped joint 12 is an SC series cylinder joint standard component, one end of the Y-shaped joint 12 is symmetrically provided with two clamping pieces which are parallel to each other, a Y-shaped smooth through hole is arranged in a manner of being perpendicular to the two clamping pieces and penetrating through the two clamping pieces, and a Y-shaped threaded blind hole is arranged on a longitudinal rotating axis at the other end of the Y-shaped joint 12.
The middle part of the circular pipe clamp 13 is provided with a pipe clamp light through hole, the left end of the circular pipe clamp is protruded to be provided with a gap which is communicated with the pipe clamp light through hole and has the same thickness as the pipe clamp light through hole and is used for clamping, the head part of the right end of the circular pipe clamp is a sheet plate type structural member, the right end of the circular pipe clamp is provided with a right end light through hole which is vertical to the surface of the circular pipe clamp in a penetrating way, and the center of the left end of the circular pipe clamp is provided with a left end threaded through hole of which.
The long rod 14 is a cylindrical straight rod structural member, external threads are arranged at two ends of the long rod 14, and the long rod 14 is connected with 2 'I' -shaped connectors 11 with the same structure through the external threads at the two ends;
the short rod 15 is a cylindrical straight rod structural member, external threads are arranged at two ends of the short rod 15, and the short rod 15 is connected with the Y-shaped joint 12 through the external threads at the two ends and the I-shaped joint 11;
the No. 1 short shaft 16 is a cylindrical straight rod type 3-section stepped shaft part, the diameter and the length of a first section shaft and a third section shaft at two ends are equal and smaller than the diameter of a second section shaft at the middle position, and two rolling bearings 17 are respectively arranged on the first section shaft and the third section shaft;
the bearing 17 is a 6000 series deep groove ball bearing;
the fixing rod 18 is a cylindrical straight rod type structural member, external threads are arranged at two ends of the fixing rod 18, and the external threads at two ends of the fixing rod 18 are connected with the two 'Y' -shaped joints 12;
one end of the short rod 15 is connected with the I-shaped joint 11 through threads, and the other end of the short rod 15 is connected with the Y-shaped joint 12 through threads; one end of the long rod 14 is connected with the second I-shaped joint 11 through threads, and the other end of the long rod 14 is connected with the third I-shaped joint 11 through threads; the No. 1 short shaft 16 is simultaneously inserted into the unthreaded holes on the I 'type joint 11 connected with the other end of the long rod 14 and the' Y 'type joint 12 connected with the other end of the short rod 15, wherein the end part of the' I 'type joint 11 connected with the end of the long rod 14 is arranged in the middle of the end part of the' Y 'type joint 12 connected with the end of the short rod 15, the long rod 14 is rotatably connected with the other end of the short rod 15, and 2 bearings 17 with the same structure are sleeved on the two ends of the No. 1 short shaft 16 extending out of the Y' type unthreaded hole on the 'Y' type joint 12;
two ends of a fixed rod 18 and a second Y '-shaped joint 12 are in threaded connection with a third Y' -shaped joint 12, and two fixed rods 18One end of the Y '-shaped joint 12 at the end is connected with one end of 2 circular tube clamps 13 through 2 short pins 22 with the same structure, namely, one end of 2 circular tube clamps 13 with the same structure is arranged in the middle of one end of 2Y' -shaped joints 12 with the same structure, and 2 short pins with the same structure22The other ends of 2 round pipe clamps 13 with the same structure are sleeved at the middle parts of a long rod 14 and a short rod 15 and are clamped and fixed by bolts, and the round pipe clamps 13 and the Y-shaped unthreaded holes on the Y-shaped joint 12 are inserted into the I-shaped unthreaded holes and the Y-shaped unthreaded holes on the 2 pairs of round pipe clamps 13.
Referring to fig. 3, the supporting structure 2 includes 9 cross connectors 19 having the same structure, a fixing block 20, a vertical shaft 23, two horizontal shafts 24 having the same structure, two fixing shafts 25 having the same structure, and 4 'I' -shaped joints 11 having the same structure.
Referring to fig. 15, the cross connector 19 is a cuboid-shaped structural member, two ends of the cross connector 19 are provided with optical through holes, the rotation axes of the 2 optical through holes with the same structure are perpendicular to each other in a spatial cross manner, the distances between the left end surface and the right end surface of the rotation axes of the 2 optical through holes with the same structure are equal, a gap with the thickness of 2mm is arranged along the radial direction of the 2 optical through holes with the same structure and perpendicular to the left end surface and the right end surface, the gap is communicated with the 2 optical through holes with the same structure, one of two side walls of the gap is provided with a threaded hole, the other of the two side walls of the gap is provided with an optical hole, and a bolt is inserted into the optical through hole on one side wall and then connected with the threaded hole on the other side wall, so that.
Referring to fig. 16, the fixing block 20 is a cuboid structural member, two ends of the fixing block 20 are symmetrically provided with U-shaped grooves having the same structure, two groove walls of the U-shaped grooves are provided with optical through holes having collinear rotation axes, the center of the fixing block 20 is provided with a central threaded hole matched with the end part provided with the thread on the vertical shaft 23, and the rotation axis of the central threaded hole is spatially crossed and perpendicular to the rotation axes of the optical through holes provided on the groove walls of the U-shaped grooves at the two ends of the fixing block 20.
The No. 2 short shaft 21 is a cylinder with the same diameter;
the short pin 22 is a cylinder with equal diameter;
the vertical shaft 23 is a cylindrical straight rod structural member, and two ends of the vertical shaft 23 are respectively provided with threads.
The transverse shaft 24 is a cylindrical straight rod structural part;
the fixing shaft 25 is a cylindrical straight rod type structural member, external threads are arranged at two ends of the fixing shaft 25, and two ends of the fixing shaft 25 are connected with the two 'I' -shaped joints 11 through threads.
The 3 No. 2 short shafts 21 with the same structure are respectively fixed at the left end, the right end and the middle position of two transverse shafts 24 with the same structure in parallel through 2 vertically arranged cross connectors 19 with the same structure; specifically, the method comprises the following steps: the two ends of the No. 2 stub shaft 21 are vertically connected to 2 cross shafts 24 with the same structure through cross connectors 19. The No. 2 short shaft 21 fixed in the middle position of two transverse shafts 24 with the same structure is vertically and spatially crossed with the vertical shaft 23 through 1 transverse cross connector 19, so that the 2 transverse shafts 24 with the same structure are fixed on the front side and the rear side of the vertical shaft 23 in parallel and in alignment and are vertically and spatially crossed; the two cross connectors 19 fixed on the right side of the vertical shaft 23 in the middle position of the 2 transverse shafts 24 with the same structure are used for forming a bottom plane with the two cross connectors 19 fixed on the left side of the vertical shaft 23 in the middle position of the 2 transverse shafts 24 with the same structure, and the bottom plane is used for supporting the No. 1 spring base 101.
The 2 short pins 22 with the same structure are simultaneously inserted into the I-shaped light through holes on the I-shaped joints 11 connected with one ends of the 2 fixing shafts 25 with the same structure and the light through holes at two ends of the fixing block 20, one end of the I-shaped joint 11 is positioned in the U-shaped grooves at two ends of the fixing block 20, the other end of the 2 fixing shafts 25 with the same structure is connected with the I-shaped joint 11, the I-shaped joint 11 is sleeved at the middle of the No. 2 short shafts 21 connected with the two ends of the 2 transverse shafts 24 with the same structure by adopting the cross connectors 19 through the I-shaped light through holes on the I-shaped joint 11, namely, the end part of the I-shaped joint 11 at the other end of the 2 fixing shafts 25 with the same structure is placed between the cross connectors 19 at two ends of the 2 transverse shafts 24 with the same structure.
Referring to fig. 6, the plate spring 3 is a rectangular thin plate structural member, 4 plate spring light through holes with the same structure are arranged at the center of the plate spring 3, and the 4 plate spring light through holes with the same structure are symmetrically arranged relative to the longitudinal and transverse symmetry axes of the plate spring 3;
referring to fig. 4, the bottom plate 4 includes a base and 4 lugs with the same structure;
the base is a rectangular plate, a 2-section stepped through hole is formed in the center of the base, the diameter of the small-diameter section light through hole is equal to that of the vertical shaft 23, the small-diameter section light through hole and the vertical shaft are in sliding fit, the outer diameter of the large-diameter section light hole is equal to that of the No. 2 spring base 102, 4 light through holes are symmetrically formed in the periphery of the 2-section stepped through hole, and the central connecting line of the 4 light through holes is a quadrangle with the same symmetrical axis as the base;
the lug is a rectangular plate, one end of the lug is provided with a light through hole, the distance from the rotating axis of the light through hole to the other end of the lug, namely the installed base is large, the distance from the axis of the light through hole to the upper surface of the rectangular base is 22mm in the embodiment, 4 rectangular lugs with the same structure are vertically installed on the base, and the 4 rectangular lugs with the same structure are symmetrically arranged relative to the longitudinal and transverse symmetrical lines of the base; one end of an 'I' -shaped joint 11 connected with one end of a long rod 14 in the joint fixing structure 1 is arranged between two lugs which are symmetrical front and back on one side of a bottom plate 4, and a short pin 22 is adoptedWill be provided withThe I-shaped joint 11 connected with one end of the long rod 14 in the joint fixing structure 1 is connected with two lugs which are symmetrical front and back on one side of the bottom plate 4.
Referring to fig. 1 and 10, the linear bearing 5 with a flange includes a circular ring body and a flange seat, the inner diameter of the circular ring body is equal to the diameter of the cross shaft 24 in the supporting structure 2, and the outer diameter of the circular ring body is equal to the inner diameter of the bottom wall light through hole on the bearing connecting block 6; the two longitudinal ends of the strip-shaped flange seat are symmetrically provided with optical through holes, the distance between the axes of the two optical through holes is equal to the distance between the axes of the two threaded holes on the bearing connecting block 6, one end of the ring body is connected with one large end face of the flange seat into a whole, and the rotation axis of the ring body is collinear with the symmetry line of the flange seat; the flanged linear bearing 5 is connected with the bearing connecting block 6 by screws.
Referring to fig. 5, the bearing connecting block 6 is a U-shaped structural member, a groove is provided at the upper end of the bearing connecting block 6, groove wall smooth through holes with collinear rotation axes are provided on two groove walls, two groove bottom wall smooth through holes with equal structures are provided on the groove bottom wall of the bearing connecting block 6, the rotation axes are parallel and symmetrical, the diameter of the groove bottom wall smooth through hole is equal to the outer diameter of the ring body in the flanged linear bearing 5, and two threaded connecting holes are respectively provided above and below the two groove bottom wall smooth through holes; the two threaded connecting holes are aligned with the two optical through holes on the flange seat in the linear bearing 5 with the flange; the No. 2 short shaft 21 is inserted into the groove wall light through holes on the two groove walls and the I-shaped light through hole on the I-shaped joint 11 connected with one end of the short rod 15 in the fixed joint structure, and one end of the I-shaped joint 11 connected with one end of the short rod 15 is placed in the groove at the upper end of the bearing connecting block 6.
Referring to fig. 8, the flange 8 with a neck includes a flange base and a neck, the flange base is a disc-shaped structural member, 4 flange optical through holes with the same structure are symmetrically arranged on the flange base along a rotation axis, the distance between two opposite flange optical through holes is equal, the 4 flange optical through holes with the same structure on the flange base are aligned with the 4 plate spring optical through holes with the same structure on the plate spring 3, and a threaded through hole which is the same as the threaded hole of the neck is arranged at the center of the flange base; the neck part is a circular ring body, and a central hole of the neck part is a threaded hole matched with the vertical shaft 23; one end of the neck part is connected with the center of the flange base into a whole, and the rotation axes of the neck part and the flange base are collinear;
referring to fig. 11, the object stage 7 is a rectangular plate, 4 object stage light through holes with the same structure are symmetrically arranged at the center of the longitudinal and transverse symmetrical axes, and the 4 object stage light through holes with the same structure on the object stage 7 are aligned with the 4 leaf spring light through holes with the same structure on the leaf spring 3. Bolts are sequentially inserted into the flange base of the neck flange 8, the plate spring 3, the flange smooth through hole formed in the objective table 7, the plate spring smooth hole and the objective table smooth through hole, and then nuts are screwed, so that the neck flange 8 and the plate spring 3 are connected with the objective table 7.
2. Referring to fig. 1, the positive stiffness mechanism includes a spring 9, a spring base 1 101, and a spring base 2 102.
The spring 9 is a cylindrical spiral spring wound by spring wires. The two ends of the spring 9 are mounted on the No. 1 spring base 101 and the No. 2 spring base 102.
Referring to fig. 9, the No. 1 spring base 101 includes a No. 1 bottom disc and a No. 1 hollow cylinder;
the center of the No. 1 bottom disc is provided with a No. 1 smooth through hole, the diameter of the No. 1 smooth through hole is equal to that of the vertical shaft 23, the No. 1 smooth through hole and the vertical shaft 23 are assembled, and the bottom surface of the No. 1 bottom disc is contacted with a bottom plane formed by 4 cross connectors 19 with the same structure at the middle positions of 2 transverse shafts 24 with the same structure;
the outer diameter of the No. 1 hollow cylinder is equal to the inner diameter of the spring 9; no. 1 hollow cylinder, No. 1 unthreaded hole and No. 1 bottom disc's among No. 1 spring base 101 axis of revolution collineation.
Referring to fig. 7, the No. 2 spring base 102 includes a No. 2 bottom disc, a No. 2 hollow cylinder;
no. 2 bottom disc center department be provided with No. 2 smooth through-holes, No. 2 smooth through-holes's diameter equals with vertical axis 23's diameter, both are furnished with, the external diameter of No. 2 bottom discs equals with the internal diameter of the big diameter section unthreaded hole in the 2 sections of formula shoulder holes on the bottom plate 4, No. 2 bottom discs are placed in the big diameter section unthreaded hole in the 2 sections of formula shoulder holes on the bottom plate 4, contact because the annular circular bead that the diameter difference formed in the bottom face of No. 2 bottom discs and the 2 sections of formula shoulder holes on the bottom plate 4.
The outer diameter of the No. 2 hollow cylinder is equal to the inner diameter of the spring 9; no. 2 hollow cylinder, No. 2 unthreaded hole and No. 2 bottom disc's among No. 2 spring base 102 axis of revolution collineation.
A theory of operation of accurate zero rigidity isolator:
the quasi-zero stiffness vibration isolator realizes low dynamic stiffness of an integral vibration isolation system by connecting a positive stiffness mechanism and a negative stiffness mechanism in parallel and adopts the natural frequency expression of the vibration isolation system
The stiffness reduction enables a lower natural frequency of the vibration isolation system; compared with a linear vibration isolation system, the quasi-zero stiffness vibration isolator has better isolation effect on the vibration of a low frequency domain, and simultaneouslyThe high static rigidity is kept, and the load with certain weight can be borne; during the use, bottom plate 4 is fixed, objective table 7 bears the weight of the thing, the isolator is compressed, objective table 7 and 4 intervals of bottom plate reduce, bearing connecting block 6 moves to both sides along cross axle 24, antifriction bearing 17 rolls to both sides along 3 surfaces of leaf spring in the joint mechanism 1 is decided to both sides simultaneously, stock 14 rotates around stub 22, utilize the angle of deciding that stock 14 and stub 15 formed to make 3 bending deformation of leaf spring, whole negative stiffness mechanism produces the negative stiffness in vertical direction, compression spring 9 produces positive stiffness in vertical direction, negative stiffness mechanism produces the negative stiffness in vertical direction, positive and negative stiffness is cancelled, make the rigidity of whole isolator be near zero rigidity. When the object stage 7 vibrates up and down at the balance position, the dynamic stiffness of the vibration isolator is close to zero, and the natural frequency is naturally very low. The quasi-zero stiffness vibration isolator can produce lower transmissibility relative to the same excitation frequency, so that the quasi-zero stiffness vibration isolator has good isolation effect on even low-frequency vibration.
Claims (8)
1. A quasi-zero stiffness vibration isolator is characterized in that the quasi-zero stiffness vibration isolator comprises a negative stiffness mechanism and a positive stiffness mechanism;
the negative stiffness mechanism comprises 2 sets of joint fixing structures (1) with the same structure, a supporting structure (2), a plate spring (3), a bottom plate (4), 4 linear bearings (5) with the same structure, 2 bearing connecting blocks (6) with the same structure, an object stage (7), a neck flange (8), 4 short pins (22) with the same structure and 5 short shafts (21) with the same structure and No. 2;
the positive stiffness mechanism comprises a spring (9), a No. 1 spring base (101) and a No. 2 spring base (102);
the two sets of fixed joint structures (1) with the same structure are symmetrically arranged at the left side and the right side of a vertical shaft (23) in the supporting structure (2) and are positioned between two transverse shafts (24) with the same structure in the supporting structure (2), one end of a short rod (15) in each set of fixed joint structure (1) with the same structure is sleeved and connected with the two transverse shafts (24) with the same structure through a linear bearing (5) arranged in a bearing connecting block (6), and the lower end of a long rod (14) in each set of fixed joint structure (1) with the same structure is connected with a bottom plate (4) which is sleeved and arranged at the lower end of the vertical shaft (23) and is positioned above a fixed block (20) in the supporting structure (2) through a short pin (22); the neck flange (8) and the plate spring (3) which are overlapped from bottom to top are connected with the objective table (7) through bolts, the neck flange (8) is in threaded connection with the top end of the vertical shaft (23), and the bottom end face of the plate spring (3) is in contact connection with 4 bearings (17) with the same structure in 2 sets of fixed joint structures (1) with the same structure; the positive stiffness mechanism is sleeved on the vertical shaft (23), the top end of the positive stiffness mechanism is in contact connection with the bottom end faces of 4 cross connectors (19) which are identical in structure and arranged in the middle of 2 transverse shafts (24) identical in structure through a No. 1 spring base (101), the bottom end of the positive stiffness mechanism is installed on the bottom plate (4) through a No. 2 spring base (102), and the spring (9) is installed between the No. 1 spring base (101) and the No. 2 spring base (102).
2. The quasi-zero stiffness vibration isolator according to claim 1, characterized in that the fixed joint structure (1) further comprises 3 'I' -shaped joints (11) with the same structure, 3 'Y' -shaped joints (12) with the same structure, 2 circular pipe clamps (13) with the same structure, a No. 1 short shaft (16) and a fixed rod (18);
two ends of the long rod (14) are in threaded connection with 2 'I' -shaped joints (11) with the same structure; two ends of the short rod (15) are in threaded connection with the I-shaped joint (11) and the Y-shaped joint (12); two ends of the fixed rod (18) are in threaded connection with 2 'Y' -shaped joints (12) with the same structure; one end of the long rod (14) is connected with one end of the short rod (15) provided with the Y-shaped joint (12) by a No. 1 short shaft (16), and 2 bearings (17) with the same structure are sleeved on two ends of the No. 1 short shaft (16) extending out of the Y-shaped unthreaded hole on the Y-shaped joint (12); two ends of the fixed rod (18) are connected with one ends of 2 circular pipe clamps (13) which are sleeved on the long rod (14) and the short rod (15) and have the same structure by adopting short pins (22) through 2 'Y' -shaped joints (12) which have the same structure.
3. A quasi-zero stiffness vibration isolator according to claim 1 wherein the support structure (2) further comprises 4 structurally identical 'I' joints (11), 9 structurally identical cross connectors (19) and two identical fixed shafts (25);
3 No. 2 short shafts (21) with the same structure are respectively fixed at the left end, the right end and the middle position of two transverse shafts (24) with the same structure in parallel through 2 vertically arranged cross connectors (19) with the same structure; specifically, the method comprises the following steps: two ends of a No. 2 short shaft (21) are respectively and vertically connected with 2 transverse shafts (24) with the same structure through cross connectors (19), wherein the No. 2 short shaft (21) fixed at the middle position of the two transverse shafts (24) with the same structure is in spatial vertical cross connection with the vertical shaft (23) through 1 transverse cross connector (19), so that the 2 transverse shafts (24) with the same structure are fixed on the front side and the rear side of the vertical shaft (23) in parallel alignment and are in spatial vertical cross; the two cross connectors (19) fixed on the right side of the vertical shaft (23) in the middle position of the 2 transverse shafts (24) with the same structure are used for forming a bottom plane with the two cross connectors (19) fixed on the left side of the vertical shaft (23) in the middle position of the 2 transverse shafts (24) with the same structure, and the bottom plane is in contact connection with the No. 1 spring base (101);
one end of each fixed shaft (25) with the same structure, which is connected with the I-shaped joint (11), is connected with two ends of the fixed block (20) by adopting 2 short pins (22) with the same structure, the other end of each fixed shaft (25) with the same structure, which is connected with the I-shaped joint (11), is connected with 2 symmetrical cross connectors (19) with the same structure, which are arranged at two ends of a transverse shaft (24) with the same structure, by adopting 2 short shafts (21) with the same structure, the upper end of a vertical shaft (23) is in threaded connection with a flange (8) with a neck, and the lower end of the vertical shaft (23) is in threaded connection with the fixed block (20).
4. The quasi-zero stiffness vibration isolator according to claim 3, wherein the cross connector (19) is a cuboid structural member, the two ends of the cross connector (19) are provided with the same structure of light through holes, the rotation axes of the 2 same structure of light through holes are crossed and vertical in space, the distances between the rotation axes of the 2 same structure of light through holes and the left end surface and the right end surface are equal, a gap with the same thickness is arranged along the radial direction of the 2 same structure of light through holes and vertical to the left end surface and the right end surface, the gap is communicated with the 2 same structure of light through holes, one side wall of the two side walls of the gap is provided with a threaded hole, the other side wall of the two side walls of the gap is provided with a light hole for installing a bolt, and the bolt is inserted into the light through hole on one side wall and then is connected with the threaded hole on the other side wall.
5. The quasi-zero stiffness vibration isolator according to claim 3, wherein the fixing block (20) is a cuboid structural member, two ends of the fixing block (20) are symmetrically provided with 'U' -shaped grooves with the same structure, the groove walls of the 2 'U' -shaped grooves with the same structure are symmetrically provided with light through holes with collinear rotation axes, the center of the fixing block (20) is provided with a central threaded hole matched with the threaded end part of the vertical shaft (23), and the rotation axis of the central threaded hole is in a spatial crossing perpendicular relationship with the rotation axes of the light through holes arranged on the groove walls of the 'U' -shaped grooves at the two ends of the fixing block (20).
6. A quasi-zero stiffness vibration isolator according to claim 1 wherein the base plate (4) includes 4 lugs having the same configuration as the base plate;
the base is a rectangular plate, a 2-section stepped through hole is formed in the center of the base, the diameter of the small-diameter section of the optical through hole is equal to that of the vertical shaft (23), the small-diameter section of the optical through hole is in sliding fit with the vertical shaft, the large-diameter section of the optical through hole is equal to that of the No. 2 spring base (102), 4 optical through holes are symmetrically formed in the periphery of the 2-section stepped through hole, and the central connecting line of the 4 optical through holes is a quadrangle which is in the same axis of symmetry with the base;
the lug is a rectangular plate, one end of the lug is provided with a light through hole, the distance from the rotating axis of the light through hole to the other end of the lug, namely the installed base is large, 4 rectangular lugs with the same structure are vertically installed on the base, and the 4 rectangular lugs with the same structure are arranged in parallel and symmetrically relative to the longitudinal and transverse symmetrical lines of the base.
7. The quasi-zero stiffness vibration isolator according to claim 1, characterized in that the bearing connecting block (6) is a U-shaped structural member, a groove is arranged at the upper end of the bearing connecting block (6), groove wall smooth through holes with collinear rotation axes are arranged on two groove walls, 2 groove bottom wall smooth through holes with the same structure and with parallel symmetry rotation axes are arranged on the groove bottom wall of the bearing connecting block (6), the diameter of the groove bottom wall smooth through holes is equal to the outer diameter of a ring body in the flanged linear bearing (5), and threaded connecting holes are respectively arranged above and below the 2 groove bottom wall smooth through holes; the 2 threaded connection holes are aligned with the 2 optical through holes on the flange seat in the linear bearing (5) with the flange.
8. The quasi-zero stiffness vibration isolator according to claim 1, wherein the number 1 spring mount (101) comprises a number 1 bottom disc and a number 1 hollow cylinder;
the center of the No. 1 bottom disc is provided with a No. 1 smooth through hole, the diameter of the No. 1 smooth through hole is equal to that of the vertical shaft (23), the No. 1 smooth through hole and the vertical shaft are assembled, and the bottom surface of the No. 1 bottom disc is in contact with a plane formed by the bottom end surfaces of 4 cross connectors (19) with the same structure and fixed in the middle of 2 transverse shafts (24) with the same structure;
the outer diameter of the No. 1 hollow cylinder is equal to the inner diameter of the spring (9); one end of the No. 1 hollow cylinder is connected with the upper surface of the No. 1 bottom disc into a whole, and the rotation axes of the No. 1 hollow cylinder, the No. 1 smooth through hole and the No. 1 bottom disc are collinear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922339490.9U CN211648916U (en) | 2019-12-24 | 2019-12-24 | Quasi-zero stiffness vibration isolator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922339490.9U CN211648916U (en) | 2019-12-24 | 2019-12-24 | Quasi-zero stiffness vibration isolator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211648916U true CN211648916U (en) | 2020-10-09 |
Family
ID=72698321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922339490.9U Expired - Fee Related CN211648916U (en) | 2019-12-24 | 2019-12-24 | Quasi-zero stiffness vibration isolator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211648916U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111306244A (en) * | 2019-12-24 | 2020-06-19 | 吉林大学 | Quasi-zero stiffness vibration isolator |
-
2019
- 2019-12-24 CN CN201922339490.9U patent/CN211648916U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111306244A (en) * | 2019-12-24 | 2020-06-19 | 吉林大学 | Quasi-zero stiffness vibration isolator |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108167362B (en) | A kind of quasi-zero stiffness vibration isolators using multi-electrode Squeeze Mode magnetic spring and swing rod | |
| CN111306244A (en) | Quasi-zero stiffness vibration isolator | |
| CN108757799B (en) | Flexible quasi-zero stiffness vibration isolation device | |
| CN211648916U (en) | Quasi-zero stiffness vibration isolator | |
| CN110385730B (en) | Modular vibration reduction system for track robot | |
| US20230074188A1 (en) | Negative stiffness generating mechanism and quasi-zero stiffness vibration isolator | |
| CN109630582A (en) | A kind of electromagnetic spring of adjustable rigidity | |
| CN109532917B (en) | Primary suspension structure of railway vehicle | |
| CN113503336B (en) | Constant-accurate zero-rigidity vibration isolator | |
| CN203592294U (en) | Coaxiality regulator | |
| CN110646135A (en) | Horizontal push-pull dynamometer detector | |
| CN107097221B (en) | Robot tail end linear guide rail | |
| CN215942156U (en) | Clamp system for processing bilateral symmetry workpieces | |
| CN109781568B (en) | Test bed for measuring vibration displacement load fretting wear of connection interface of combined rotor | |
| CN112976058A (en) | Quick change device based on principle is inhaled to magnetism | |
| CN113048185A (en) | Gravity compensator and bearing device | |
| CN112112928A (en) | Vibration control structure with vibration isolation and vibration absorption integrated performance | |
| CN220035720U (en) | Detachable steel beam structure node connecting member and steel beam structure fixing device | |
| CN212377182U (en) | Quasi-zero stiffness vibration isolator with cantilever leaf springs | |
| CN219175533U (en) | Multi-order sliding polymer composite friction damper | |
| CN101748819A (en) | Damping control device | |
| CN219102227U (en) | Ship-shaped pipe clamp | |
| CN216430785U (en) | Fixing device of split type structure | |
| CN216278962U (en) | High-strength radial air suspension bearing | |
| CN220094538U (en) | Fixing device for vacuum pump assembly |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201009 Termination date: 20211224 |