CN212377182U - Quasi-zero stiffness vibration isolator with cantilever leaf springs - Google Patents

Quasi-zero stiffness vibration isolator with cantilever leaf springs Download PDF

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CN212377182U
CN212377182U CN202021960720.XU CN202021960720U CN212377182U CN 212377182 U CN212377182 U CN 212377182U CN 202021960720 U CN202021960720 U CN 202021960720U CN 212377182 U CN212377182 U CN 212377182U
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spring
plate
shaped lever
fixing
guide
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孙晓
赵丁选
周兴华
杨啸
唐可洪
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Jilin University
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Jilin University
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Abstract

The utility model discloses a quasi-zero stiffness vibration isolator of a cantilever leaf spring, which overcomes the problem that the requirements of large load and low frequency vibration isolation under limited precompression quantity are difficult to meet and consists of a foundation plate, a load platform, a positive stiffness mechanism and a negative stiffness mechanism; the negative stiffness mechanism comprises a right fixed plate, a spring fixed seat, a left fixed plate and a supporting rod; the foundation plate is horizontally placed, and the load platform is positioned right above the foundation plate in parallel; a left spring damping guide mechanism and a right spring damping guide mechanism of the positive stiffness mechanism are vertically arranged at the left end and the right end between the foundation plate and the load platform, the left spring damping guide mechanism is fixedly connected with the top end of the right spring damping guide mechanism and the load platform, and the left spring damping guide mechanism is fixedly connected with the bottom end of the right spring damping guide mechanism and the foundation plate; the bottom end of the negative stiffness mechanism is installed on a foundation plate in the positive stiffness mechanism through a right fixed plate, a spring fixed seat and a left fixed plate, and the top end of the negative stiffness mechanism is connected with a load platform through a supporting rod.

Description

Quasi-zero stiffness vibration isolator with cantilever leaf springs
Technical Field
The utility model relates to a low frequency vibration isolation mounting, more precisely, the utility model relates to a parallelly connected non-linear accurate zero rigidity isolator who constitutes by positive negative rigidity mechanism.
Background
The use of precision instruments, the operation of aerospace equipment, the comfort of vehicle driving, and the safety and shock resistance of building bridges and the like all require isolation of interference from the environment and self vibration. The addition of a vibration isolator between equipment and a vibration source is a common vibration isolation mode, while a linear vibration isolator widely adopted in engineering has the problem that the performance requirements of large load (requiring high rigidity) and low-frequency vibration isolation (requiring low rigidity) under a limited pre-compression amount are difficult to simultaneously meet. The nonlinear quasi-zero stiffness vibration isolator with high static stiffness and low dynamic stiffness, which is formed by connecting positive and negative stiffness mechanisms in parallel, has the unique advantages of being widely concerned and researched by engineering technicians and scientific researchers. The nonlinear quasi-zero stiffness vibration isolator which is reported and researched at present mainly comprises an inclined spring parallel vertical spring type, an inclined rigid rod hinged horizontal spring parallel vertical spring type, a shear type, a cam roller horizontal spring parallel vertical spring type, a magnetic spring type, an Euler pressure rod parallel linear vibration isolator type and the like. The utility model discloses a quasi-zero stiffness vibration isolator containing cantilever leaf spring and L type lever combination.
Disclosure of Invention
The utility model aims to solve the technical problem that it is difficult to satisfy simultaneously the problem that heavy load (require high rigidity) and low frequency vibration isolation (require low rigidity) required under the limited precompression volume to have overcome linear isolator, provide a positive and negative rigidity mechanism parallelly connected, have high quiet rigidity and the low accurate zero rigidity isolator that contains cantilever leaf spring and L type lever combination of dynamic stiffness characteristic.
In order to solve the technical problem, the utility model discloses an adopt following technical scheme to realize: the cantilever leaf spring quasi-zero stiffness vibration isolator consists of a foundation plate, a load platform, a positive stiffness mechanism and a negative stiffness mechanism;
the positive stiffness mechanism comprises a left spring damping guide mechanism and a right spring damping guide mechanism;
the negative stiffness mechanism comprises a right fixed plate, a spring fixed seat, a left fixed plate and a supporting rod;
the foundation plate is horizontally placed, and the load platform is horizontally placed and positioned right above the foundation plate; the left spring damping guide mechanism and the right spring damping guide mechanism are vertically arranged between the foundation plate and the load platform and positioned at the left end and the right end of the foundation plate and the load platform, the top ends of the left spring damping guide mechanism and the right spring damping guide mechanism are fixedly connected with the bottom surface of the load platform, and the bottom ends of the left spring damping guide mechanism and the right spring damping guide mechanism are fixedly connected with the upper surface of the foundation plate; the bottom end of the negative stiffness mechanism is installed on a foundation plate between the left spring damping guide mechanism and the right spring damping guide mechanism through the right fixing plate, the spring fixing seat and the left fixing plate, and the top end of the negative stiffness mechanism is fixedly connected with the center of the bottom surface of the load platform through the supporting rod.
The negative stiffness mechanism in the technical scheme further comprises a first guide rod, a second guide rod, a left guide sleeve component, a left L-shaped lever component, a support rod connector, a right L-shaped lever component, a right guide sleeve component, a leaf spring and a spring pressing plate; the spring fixing seat is arranged at the center of the foundation plate, the left fixing plate and the right fixing plate are symmetrically arranged on the left side and the right side of the spring fixing seat in parallel, and the left fixing plate and the right fixing plate are positioned on the inner sides of the left spiral spring and the right spiral spring in the left spring damping guide mechanism and the right spring damping guide mechanism; the leaf springs are arranged in the grooves at the top ends of the spring fixing seats in a bilateral symmetry manner and are fixed with the bolts by adopting spring pressing plates; the first guide rod and the second guide rod are arranged at the upper ends of the left fixing plate and the right fixing plate in parallel, and the distances from the first guide rod and the second guide rod to the upper surface of the base plate are equal; the left guide sleeve component and the right guide sleeve component are sleeved on the first guide rod and the second guide rod, and the left guide sleeve component and the right guide sleeve component are in sliding connection with the first guide rod and the second guide rod; the left L-shaped lever part and the right L-shaped lever part are sleeved on the left guide sleeve part and the right guide sleeve part through the middle parts of the left L-shaped lever part and the right L-shaped lever part, the left guide sleeve part and the right guide sleeve part are in rotating connection, the top end of the left L-shaped lever part is in rotating connection with the top end of the right L-shaped lever part and the supporting rod connector through pin shafts, and the supporting rod connector is fixedly connected with the center of the bottom end face of the load platform through a supporting rod; the left L-shaped lever component is in contact connection with the bottom end of the right L-shaped lever component and the upper surface of the leaf spring.
The left L-shaped lever component in the technical scheme is composed of a left rolling bearing, a left L-shaped lever body and a left L-shaped lever long arm connector; the left L-shaped lever body consists of a left L-shaped lever short arm, a left L-shaped lever elbow joint and a left L-shaped lever long arm; the top end of the left L-shaped lever short arm and the left end of the left L-shaped lever long arm are respectively welded and fixed on the outer cylindrical surface of a left L-shaped lever elbow joint, the left L-shaped lever short arm is positioned below the left L-shaped lever elbow joint, the left L-shaped lever long arm is positioned on the right side of the left L-shaped lever elbow joint, the rotation axis of the left L-shaped lever short arm and the left L-shaped lever long arm is mutually and vertically intersected with the rotation axis of the left L-shaped lever elbow joint, and the rotation axis of the left L-shaped lever short arm and the left L-shaped lever long arm is vertically intersected on the same plane; the long arm connector of the left L-shaped lever is in threaded connection with the right end of the long arm of the left L-shaped lever, the left rolling bearing is fixed at the bottom end of the short arm of the left L-shaped lever through a pin shaft, and an inner bearing ring of the left rolling bearing is in interference fit with the pin shaft.
The left guide sleeve component in the technical scheme is composed of a first fixing sleeve, a first linear bearing, a first bearing baffle ring, a second linear bearing, a second bearing baffle ring, a second fixing sleeve, a third bearing baffle ring, a connecting shaft and a fourth bearing baffle ring; the first fixing sleeve is sleeved on the first linear bearing, the first bearing baffle ring and the fourth bearing baffle ring are arranged in bearing baffle ring grooves at two ends of the first linear bearing, and the first bearing baffle ring is in contact connection with the inner side end surface of the fourth bearing baffle ring and two end surfaces of a large circular ring body in the first fixing sleeve; the second fixing sleeve is sleeved on the second linear bearing, the second bearing baffle ring and the third bearing baffle ring are arranged in bearing baffle ring grooves at two ends of the second linear bearing, and the second bearing baffle ring is in contact connection with the inner side end surface of the third bearing baffle ring and two end surfaces of a large circular ring body in the second fixing sleeve; one end of the connecting shaft is fixedly arranged in the small connecting hole on the first fixing sleeve, the other end of the connecting shaft is fixedly arranged in the small connecting hole on the second fixing sleeve, and the rotary axis of the connecting shaft is vertically intersected with the rotary axis of the first linear bearing and the rotary axis of the second linear bearing.
The left spring damping guide mechanism in the technical scheme comprises a left spiral spring, a left guide pillar and a left guide sleeve; the left spiral spring is a positive stiffness spring, the sum of stiffness values of the left spiral spring and a right spiral spring in the right spring damping guide mechanism is equal to or greater than the absolute value of the minimum negative stiffness of the negative stiffness mechanism, the left spiral spring is installed and fixed between a base plate and a load platform which are aligned in parallel, the left spiral spring is perpendicular to the base plate and the load platform and is arranged at the left end of the base plate and the left end of the load platform, the top end of the left spiral spring is fixedly connected with a groove at the left end of the load platform, and the bottom end of the left spiral spring is fixedly connected with the groove at the left end of the base plate; the left guide sleeve is sleeved on the left guide pillar and is in sliding connection with the left guide pillar, the left guide sleeve and the left guide pillar which are sleeved together are installed in the left spiral spring, the rotation axis of the left guide sleeve and the left guide pillar is collinear with the rotation axis of the left spiral spring, the top end of the left guide sleeve is fixedly connected with the left end of the load platform, and the bottom end of the left guide pillar is fixedly connected with the left end of the base plate.
The right spring damping guide mechanism in the technical scheme comprises a right spiral spring, a right guide pillar and a right guide sleeve; the right spiral spring is a positive stiffness spring, the sum of stiffness values of the right spiral spring and a left spiral spring in the left spring damping guide mechanism is equal to or greater than the absolute value of the minimum negative stiffness of the negative stiffness mechanism, the right spiral spring and the left spiral spring are identical in structure, the right spiral spring is fixedly installed between a foundation plate and a load platform which are aligned in parallel, the right spiral spring is perpendicular to the foundation plate and the load platform and is symmetrically arranged at the right ends of the foundation plate and the load platform with the left spiral spring, the top end of the right spiral spring is fixedly connected with a groove at the right end of the load platform, and the bottom end of the right spiral spring is fixedly connected with a groove at the right end of the foundation plate; the right guide pillar has the same structure as the left guide pillar in the left spring damping guide mechanism, the right guide pillar is arranged in a right spiral spring positioned at the right end of the foundation plate and the load platform, and the bottom end of the right guide pillar is fixedly connected with the right end of the foundation plate; the structure of the right guide sleeve is the same as that of the left guide sleeve in the left spring damping guide mechanism, the right guide sleeve is installed in a right spiral spring positioned at the right end of the foundation plate and the load platform and sleeved on a right guide pillar, the right guide sleeve and the right guide pillar are in sliding connection, the rotation axis of the right guide sleeve and the right guide pillar and the rotation axis of the right spiral spring are collinear, and the top end of the right guide sleeve is fixedly connected with the right end of the load platform.
The spring fixing seat in the technical scheme is a rectangular flat plate type structural member and consists of a rectangular fixing seat main body and a rectangular fixing base at the bottom, the bottom end of the fixing seat main body is fixedly connected with the longitudinal symmetrical line of the fixing base, the fixing seat main body is vertical to the fixing base, the width of the fixing seat main body is equal to the length of the fixing base, and 2 rows of bolt through holes for mounting bolts are uniformly formed in the fixing base; the middle of the top of the fixing seat main body is provided with a groove for fixing the leaf spring, the width of the groove is equal to that of the leaf spring, the depth of the groove is equal to that of the leaf spring, threaded holes are formed in two sides of the groove, and the threaded holes are used for fixedly connecting the spring pressing plate through bolts.
The left fixing plate in the technical scheme is a plate type structural member consisting of 2 rectangular plates, the left fixing plate consists of a fixing main plate and a fixing bottom plate, the width of the fixing main plate is equal to the length of the fixing bottom plate, two groups of through holes for mounting a first guide rod and a second guide rod are symmetrically arranged on two sides of the upper end of the fixing main plate, the distance from the symmetrical center of each group of through holes to the bottom end face of the left fixing plate is equal, and the distance is greater than the distance from the top end face of a spring fixing seat to the bottom end face of the spring fixing seat; two rows of bolt through holes are formed in the fixed base plate, the two rows of bolt through holes in the fixed base plate are symmetrically arranged on two sides of a longitudinal symmetrical line of the fixed base plate, the bottom end of the fixed main plate is vertically and fixedly connected with the longitudinal symmetrical line of the fixed base plate, the left fixed plate and the right fixed plate are identical in structure, and the left fixed plate and the right fixed plate are symmetrically arranged on the left side and the right side of the spring fixed seat.
The foundation plate in the technical scheme is a rectangular flat plate structure, the left side and the right side of the foundation plate are respectively provided with a stepped hole and four threaded holes, the left side of the foundation plate is provided with the stepped hole for installing a left guide pillar and the threaded holes for installing a left fixing plate, the left side of the foundation plate is provided with the stepped hole for installing the left guide pillar and the threaded holes for installing the right fixing plate, the stepped hole and the threaded holes on the right side of the foundation plate are respectively and symmetrically arranged with respect to the longitudinal and transverse symmetrical center line of the foundation plate, the center distance between the left stepped hole and the right stepped hole is larger than the distance between the left threaded hole and the right threaded holes, the peripheries of the left stepped hole and the right stepped hole on the foundation plate are respectively provided with circular grooves for installing the bottom ends of a left spiral spring and a right spiral spring, the rotation axes of the left stepped hole and the, the four threaded holes for installing the spring fixing seat are symmetrically arranged relative to the longitudinal and transverse symmetrical center lines of the foundation plate.
Among the technical scheme load platform be rectangle plate structure spare, load platform's the left and right sides is processed respectively and is had a shoulder hole, the left shoulder hole that is used for installing left guide pin bushing and the right side be used for installing right guide pin bushing shoulder hole and be the symmetrical arrangement about load platform's vertical and horizontal symmetry center line, the left shoulder hole of load platform is adjusted well with the left shoulder hole position of foundatin plate, the shoulder hole on load platform right side is adjusted well with the shoulder hole position on foundatin plate right side, load platform's lower surface and be provided with the annular top recess that is used for installing left coil spring and right coil spring respectively around two shoulder holes, load platform's intermediate positionAre uniformly arrangedThere are four threaded holes for securing the support rods.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the cantilever sheet spring quasi-zero stiffness vibration isolator has the characteristics of high static stiffness and low dynamic stiffness, the initial vibration isolation frequency is greatly reduced while the static supporting force is ensured, and low-frequency or even ultra-low-frequency vibration isolation can be realized;
2. compared with other quasi-zero stiffness vibration isolators formed by connecting positive stiffness and negative stiffness in parallel, the cantilever leaf spring quasi-zero stiffness vibration isolator of the utility model has the advantages that when the quasi-zero stiffness vibration isolator vibrates near a balance point, the negative stiffness mechanism can provide partial static supporting force;
3. a quasi-zero rigidity isolator of cantilever leaf spring present nonlinear damping characteristic, when not influencing high frequency vibration isolation vibration transmissivity, can reduce near natural frequency vibration's vibration transmissivity.
Drawings
The invention will be further described with reference to the accompanying drawings:
fig. 1 is an axonometric view of the structural components of a quasi-zero stiffness isolator with cantilever leaf springs according to the present invention in the initial (no load) position;
fig. 2 is an axonometric view of the structural composition of the cantilever leaf spring quasi-zero stiffness vibration isolator according to the present invention at the position of zero stiffness point;
fig. 3 is an axonometric projection view of the structure of the left L-shaped lever component employed in the quasi-zero stiffness vibration isolator with cantilever leaf springs according to the present invention;
fig. 4 is an axonometric projection view of the right L-shaped lever component structure adopted in the quasi-zero stiffness vibration isolator of the cantilever spring of the present invention;
fig. 5 is an axonometric projection view of the structural components of the left guide sleeve component employed in the quasi-zero stiffness vibration isolator with cantilever leaf springs according to the present invention;
fig. 6 is an axonometric projection view of the structure of the left L-shaped lever body of the left L-shaped lever component employed in the quasi-zero stiffness vibration isolator with cantilever leaf springs according to the present invention;
fig. 7 is an axonometric projection view of the structure of the left L-shaped lever long arm connection joint in the left L-shaped lever component employed in the quasi-zero stiffness vibration isolator of the cantilever spring of the present invention;
fig. 8 is an axonometric projection view of the structure of the right L-shaped lever long arm connection joint in the right L-shaped lever component employed in the quasi-zero stiffness vibration isolator of the cantilever spring of the present invention;
fig. 9 is an axonometric view of the structure of the first fixed sleeve in the left guide sleeve component used in the quasi-zero stiffness vibration isolator with cantilever leaf springs according to the present invention;
fig. 10 is an axonometric view of the spring holder structure used in the quasi-zero stiffness vibration isolator with cantilever leaf spring according to the present invention;
fig. 11 is an axonometric projection view of the structure of the left fixing plate used in the quasi-zero stiffness vibration isolator with cantilever leaf springs according to the present invention;
fig. 12 is an axonometric projection view of the first linear bearing structure of the left guide sleeve component employed in the quasi-zero stiffness vibration isolator of the cantilever spring according to the present invention;
fig. 13 is an axonometric view of the leaf spring structure used in the quasi-zero stiffness vibration isolator of cantilever leaf spring according to the present invention;
fig. 14 is an axial projection view of a first flange fixing disk structure adopted in the quasi-zero stiffness vibration isolator with cantilever leaf springs according to the present invention;
figure 15 is a dimensionless stiffness isolator for quasi-zero stiffness of cantilever leaf spring
Figure BDA0002672826110000051
Dimensionless relative displacement between load-bearing platform and base plate
Figure BDA0002672826110000052
The variation curve of (d);
figure 16 is a dimensionless force storage for quasi-zero stiffness vibration isolator with cantilever leaf springs according to the present invention
Figure BDA0002672826110000053
Dimensionless relative displacement between load-bearing platform and base plate
Figure BDA0002672826110000054
The variation curve of (d);
in the figure: 1. the device comprises a first guide rod, a second guide rod, a third guide sleeve component, a fourth guide rod, a fourth guide sleeve component, a fifth guide sleeve component, a sixth guide sleeve component, a fifth guide sleeve component, 6. the novel bearing comprises a right L-shaped lever component, 6-1 right rolling bearing, 6-2 right L-shaped lever body, 6-3 right L-shaped lever long arm connector, 7 right guide sleeve component, 8 right fixing plate, 9 leaf spring, 10 spring pressing plate, 11 spring fixing seat, 12 foundation plate, 13 left fixing plate, 14 left spiral spring, 15 left guide pillar, 16 left guide sleeve, 17 load platform, 18 support rod, 19 right guide sleeve, 20 right guide pillar, 21 right spiral spring, 22 first flange fixing plate, 23 second flange fixing plate, 24 third flange fixing plate and 25 fourth flange fixing plate.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings:
a quasi-zero stiffness vibration isolator of cantilever leaf spring constitute by foundatin plate 12, load platform 17, positive stiffness mechanism and burden stiffness mechanism.
The foundation plate 12 is a rectangular flat plate structure, the left side and the right side of the foundation plate are respectively provided with a stepped hole and four threaded holes, the left stepped hole and the four threaded holes are respectively and symmetrically arranged with the right side stepped hole and the four threaded holes in relation to the longitudinal and transverse symmetrical center line of the foundation plate 12, the left stepped hole and the right stepped hole are respectively used for installing a left guide pillar 15 and a right guide pillar 20, the left threaded hole and the right threaded hole are respectively used for installing a left fixing plate 13 and a right fixing plate 8, the center distance between the left stepped hole and the right stepped hole is larger than the distance between the left threaded hole and the right threaded hole, the periphery of a large hole in the two stepped holes on the foundation plate 12 is respectively provided with circular grooves, the rotary axes of the left stepped hole and the right stepped hole are respectively collinear with the rotary axes of the left circular grooves and the right circular grooves, and the left circular grooves are used for, the intermediate position of foundatin plate is provided with four screw holes for fixed spring fixing base 11, four screw holes for installation fixed spring fixing base 11 are symmetrical arrangement for the vertical and horizontal symmetry center line of foundatin plate 12.
Load platform 17 be rectangle slab structure, load platform's the left and right sides is processed respectively and is had a shoulder hole, left shoulder hole is symmetrical arrangement with the shoulder hole on right side about load platform's the symmetry center line of moving about freely and quickly, load platform 17 left shoulder hole is adjusted well with the left shoulder hole position of foundatin plate 12, the shoulder hole on load platform 17 right side is adjusted well with the shoulder hole position on foundatin plate 12 right side, be provided with annular recess of circle around two shoulder holes of lower surface of load platform 17 respectively, control two annular recesses of circle and be used for the top of fixed left coil spring 14 and right coil spring 21, load platform 17's intermediate position has four screw holes around load platform 17's symmetry center equipartition, four screw holes are used for fixed support pole 18.
Referring to fig. 1, the positive stiffness mechanism includes a left spring damping guide mechanism and a right spring damping guide mechanism, and the left spring damping guide mechanism and the right spring damping guide mechanism have the same structure.
The left spring damping guide mechanism comprises a left spiral spring 14, a left guide pillar 15 and a left guide sleeve 16;
the right spring damping guide mechanism comprises a right spiral spring 21, a right guide pillar 20 and a right guide sleeve 19;
the left spiral spring 14 and the right spiral spring 21 are both positive stiffness springs, the sum of stiffness values of the left spiral spring 14 and the right spiral spring 21 is equal to or greater than the absolute value of the minimum negative stiffness of the negative stiffness mechanism, the left spiral spring 14 and the right spiral spring 21 have the same structure and are fixedly installed between the base plate 12 and the load platform 17 which are aligned in parallel, the left spiral spring 14 and the right spiral spring 21 are perpendicular to the base plate 12 and the load platform 17 and are symmetrically arranged at the left end and the right end of the base plate 12 and the load platform 17, the top ends of the left spiral spring 14 and the right spiral spring 21 are fixedly connected with the bottom surfaces of the left end and the right end of the load platform 17, and the bottom ends of the left spiral spring 14 and the right spiral spring 21 are fixedly connected with the upper surfaces of the left end and the right end of the base;
the left guide sleeve 16 is sleeved on the left guide pillar 15 and is in sliding connection with the left guide pillar 15, the left guide sleeve 16 and the left guide pillar 15 which are sleeved together are installed in the left spiral spring 14, the rotation axis of the left guide pillar 16 and the rotation axis of the left spiral spring 14 are collinear, the outer circumferential surface of the top end of the left guide sleeve 16 is in interference fit connection with a large hole in a stepped hole at the left end of the load platform 17, the outer circumferential surface of the bottom end of the left guide pillar 15 is in interference fit connection with a large hole in a stepped hole at the left end of the foundation plate 12, and when the left guide sleeve 16 and the left guide pillar 15 slide, the left spiral spring 14 is compressed or extended to play a role in guiding in the vertical direction and provide partial damping force;
the structure of the right guide post 20 is the same as that of the left guide post 15, the right guide post 20 is arranged in a right spiral spring 21 positioned at the right end of the base plate 12 and the load platform 17, the outer circumferential surface at the bottom end of the right guide post 20 is connected with a big hole in a stepped hole at the right end of the base plate 12 in an interference fit manner, the structure of the right guide sleeve 19 is the same as that of the left guide sleeve 16, the right guide sleeve 19 is arranged in the right spiral spring 21 positioned at the right end of the base plate 12 and the load platform 17 and sleeved on the right guide post 20 and is connected with the right guide post in a sliding manner, the rotation axis of the right guide sleeve 19 and the right guide post 20 is collinear with the rotation axis of the right spiral spring 21, the outer circumferential surface at the top end of the right guide sleeve 19 is connected with the big hole in, the right coil spring 21 is compressed or extended to play a role of guiding in the vertical direction and provide a part of damping force;
referring to fig. 1, the negative stiffness mechanism includes a first guide rod 1, a second guide rod 2, a left guide sleeve component 3, a left L-shaped lever component 4, a support rod connector 5, a right L-shaped lever component 6, a right guide sleeve component 7, a right fixing plate 8, a flat spring 9, a spring pressing plate 10, a spring fixing seat 11, a left fixing plate 13 and a support rod 18;
no. 1 guide bar is the same with No. 2 guide bar structure size, all be cross section straight-bar structure spare such as cylindrical, install the upper end at right fixed plate 8 and left fixed plate 13 around No. 1 guide bar and No. 2 guide bar parallelly, the left end of a guide bar 1 and No. 2 guide bar is connected with left fixed plate 13 through a flange fixed disk 22 and No. two flange fixed disks 23 respectively, the right-hand member of a guide bar 1 and No. 2 guide bar is connected with right fixed plate 8 through No. four flange fixed disks 25 and No. three flange fixed disks 24 respectively, the distance of a guide bar 1 and No. 2 guide bar and foundatin plate 12 is the same, No. 1 guide bar and No. 2 guide bar are in same horizontal plane promptly.
Referring to fig. 1, the main body of the support rod 18 is a cylindrical straight-bar-shaped structural member with equal cross section, the bottom end of the support rod is processed with external threads and is connected with the internal thread of the support rod connector 5 in a matching manner, the top end of the main body of the support rod 18 is fixedly connected with a cylindrical boss, the diameter of the outer circumference of the boss is larger than the diameter of the main body of the support rod 18, the axis of the boss is collinear with the axis of the support rod main body, and four through holes uniformly distributed around the axis of the boss are processed on the boss and are used for being aligned and connected with four.
Referring to fig. 3 and 6, the left L-shaped lever component 4 is composed of a left rolling bearing 4-1, a left L-shaped lever body 4-2 and a left L-shaped lever long arm connector 4-3;
the left L-shaped lever body 4-2 consists of a left L-shaped lever short arm 4-2-1, a left L-shaped lever elbow joint 4-2-2 and a left L-shaped lever long arm 4-2-3;
the left L-shaped lever short arm 4-2-1 is a cylindrical straight rod structural part with the same cross section; the top end surface of the left L-shaped lever short arm 4-2-1 is arranged into a concave cylindrical surface, and the curvature radius of the concave cylindrical surface is equal to the curvature radius of the outer cylindrical surface of the left L-shaped lever elbow joint 4-2-2; the bottom end of the short arm 4-2-1 of the left L-shaped lever is provided with a symmetrical fork-shaped piece, the two fork arms of the fork-shaped piece have the same structure, and through holes which have the same diameter and are used for installing the left rolling bearing 4-1 and have collinear rotation axes are arranged on the two fork arms.
The left L-shaped lever elbow joint 4-2-2 is a circular ring structural part, the circular ring-shaped left L-shaped lever elbow joint 4-2-2 is sleeved on a connecting shaft 3-8 in the left guide sleeve component 3, and the left L-shaped lever elbow joint and the connecting shaft are in rotary connection and can rotate around the connecting shaft 3-8;
the left L-shaped lever long arm 4-2-3 is a cylindrical straight rod structural part with the same cross section; the left end surface of the left L-shaped lever long arm 4-2-3 is arranged into a concave cylindrical surface, and the curvature radius of the concave cylindrical surface is equal to that of the outer cylindrical surface of the left L-shaped lever elbow joint 4-2-2; the right end of the left L-shaped lever long arm 4-2-3 is provided with an external thread,
the top end of the left L-shaped lever short arm 4-2-1 and the left end of the left L-shaped lever long arm 4-2-3 are respectively welded and fixed on the outer curved surface of the ring body of the left L-shaped lever elbow joint 4-2-2, the left L-shaped lever short arm 4-2-1 is positioned below the left L-shaped lever elbow joint 4-2-2, the left L-shaped lever long arm 4-2-3 is positioned on the right side of the left L-shaped lever elbow joint 4-2-2, the rotation axis of the left L-shaped lever short arm 4-2-1 and the left L-shaped lever long arm 4-2-3 is mutually and vertically intersected with the rotation axis of the left L-shaped lever elbow joint 4-2-2, and the rotation axis of the left L-shaped lever short arm 4-2-1 and the left L-shaped lever long arm 4-2-3 are positioned on the same plane.
The left rolling bearing 4-1 can be a deep groove ball bearing, a needle bearing or a cylindrical roller bearing according to the requirements of size and friction characteristics.
Referring to fig. 7, the left L-shaped lever long arm connector 4-3 is composed of a U-shaped fork and a circular ring connector, the U-shaped fork is composed of 2 fork arms with the same structure and a cross beam, one end of each of the 2 fork arms with the same structure is provided with a through hole which is used for installing a pin shaft and has the same diameter and the same rotation axis, the other end of each of the 2 fork arms with the same structure is connected with the two ends of the cross beam into a whole, and the 2 fork arms with the same structure are aligned in parallel and are vertical to the cross beam; one end face of the circular ring joint is fixedly connected with the center of the outer end face of the cross beam in the U-shaped fork, and an inner hole face of the circular ring joint is provided with an inner thread which is used for being matched and connected with an outer thread at the right end of the long arm 4-2-3 of the left L-shaped lever.
The left L-shaped lever long arm connector 4-3 is connected with the right end of the left L-shaped lever long arm 4-2-3 in the left L-shaped lever body 4-2 through threads, the left rolling bearing 4-1 is fixed at the bottom end of the left L-shaped lever short arm 4-2-1 in the left L-shaped lever body 4-2 through a pin shaft, and the left rolling bearing 4-1 can freely rotate around the pin shaft;
referring to fig. 4, the right L-shaped lever component 6 is composed of a right rolling bearing 6-1, a right L-shaped lever body 6-2 and a right L-shaped lever long arm connector 6-3;
the structure of the right L-shaped lever body 6-2 is the same as that of the left L-shaped lever body 4-2, and the right L-shaped lever body 6-2 consists of a right L-shaped lever short arm, a right L-shaped lever elbow joint and a right L-shaped lever long arm; the right L-shaped lever short arm and the left L-shaped lever short arm are identical in structure 4-2-1, the right L-shaped lever elbow joint and the left L-shaped lever elbow joint are identical in structure 4-2-2, and the right L-shaped lever long arm and the left L-shaped lever long arm are identical in structure 4-2-3.
Referring to fig. 8, the right L-shaped lever long arm connector 6-3 is a cylindrical structural member, two parallel planar end surfaces are arranged on two sides of a cylinder at one end of the right L-shaped lever long arm connector 6-3, the two parallel planar end surfaces are symmetrically parallel to a rotating axis of the right L-shaped lever long arm connector 6-3, that is, one end of the right L-shaped lever long arm connector 6-3 is arranged as an oblate cylinder, and a through hole for installing a pin shaft is arranged on the planar end surface of the oblate cylinder, wherein the rotating axis and the planar end surface are vertically intersected with the rotating axis of the right L-shaped lever long arm connector 6-3; a threaded hole is processed on the rotating axis on the end face of the other end of the right L-shaped lever long arm connector 6-3, and the right L-shaped lever long arm connector 6-3 is connected with the threaded rod end of the right L-shaped lever long arm in a matching mode through the threaded hole.
The right rolling bearing 6-1 and the left rolling bearing 4-1 have the same structure size, and a deep groove ball bearing, a needle bearing or a cylindrical roller bearing can be selected according to the size and friction characteristic requirements.
The right L-shaped lever long arm connector 6-3 is connected with the left end of the right L-shaped lever long arm in the right L-shaped lever body 6-2 through threads, the right rolling bearing 6-1 is fixed at the bottom end of the right L-shaped lever short arm in the right L-shaped lever body 6-2 through a pin shaft, and the right rolling bearing 6-1 can freely rotate around the pin shaft.
Referring to fig. 1 and 5, the left guide sleeve component 3 is composed of a first fixing sleeve 3-1, a first linear bearing 3-2, a first bearing baffle ring 3-3, a second linear bearing 3-4, a second bearing baffle ring 3-5, a second fixing sleeve 3-6, a third bearing baffle ring 3-7, a connecting shaft 3-8 and a fourth bearing baffle ring 3-9;
referring to fig. 9, the first fixing sleeve 3-1 and the second fixing sleeve 3-6 are identical in structure and both consist of a large circular ring body and a small circular ring body, the centers of the small circular ring body and the large circular ring body in the length direction are connected in a penetrating manner to form a T-shaped structural member, the rotary axes of the large circular ring body and the small circular ring body are perpendicularly intersected, the inner hole of the large circular ring body is not communicated with the inner hole of the small circular ring body, the inner hole diameter of the large circular ring body is equal to the outer diameter of the first linear bearing 3-2 or the second linear bearing 3-4, the inner hole diameter of the small circular ring body is equal to the outer diameter of the connecting shaft 3-8, and the length of the large circular ring body is equal to the distance between the inner groove walls of the 2 bearing retainer ring grooves on.
Referring to fig. 12, the first linear bearing 3-2 and the second linear bearing 3-4 have the same structure, and both adopt linear bearings of model LM10UU with bearing retainer ring grooves at both ends, and the rotation axes of the first linear bearing 3-2 and the second linear bearing 3-4 are installed in parallel;
the first fixing sleeve 3-1 is sleeved on the first linear bearing 3-2, the first bearing baffle ring 3-3 and the fourth bearing baffle ring 3-9 are arranged in bearing baffle ring grooves at two ends of the first linear bearing 3-2, the inner side end surface of the first bearing baffle ring 3-3 and the fourth bearing baffle ring 3-9 is in contact connection with two end surfaces of a large ring body in the first fixing sleeve 3-1, and the first linear bearing 3-2 is axially positioned through the first bearing baffle ring 3-3 and the fourth bearing baffle ring 3-9;
the second fixing sleeve 3-6 is sleeved on the second linear bearing 3-4, the second bearing baffle ring 3-5 and the third bearing baffle ring 3-7 are arranged in bearing baffle ring grooves at two ends of the second linear bearing 3-4, the second bearing baffle ring 3-5 is in contact connection with the inner side end face of the third bearing baffle ring 3-7 and two end faces of a large ring body in the second fixing sleeve 3-6, and the second fixing sleeve 3-6 realizes axial positioning through the second bearing baffle ring 3-5 and the third bearing baffle ring 3-7; one end of a connecting shaft 3-8 is fixedly arranged in a small connecting hole of a first fixing sleeve 3-1, the other end of the connecting shaft 3-8 is fixedly arranged in a small connecting hole of a second fixing sleeve 3-6, the first fixing sleeve 3-1 and the second fixing sleeve 3-6 are fixedly connected together, and the rotary axis of the connecting shaft 3-8 is vertically intersected with the rotary axes of a first linear bearing 3-2 and a second linear bearing 3-4;
the right guide sleeve part 7 and the left guide sleeve part 3 have the same structure and are respectively sleeved at two ends of the first guide rod 1 and the second guide rod 2, and the right guide sleeve part 7 and the left guide sleeve part 3 are symmetrically arranged on the first guide rod 1 and the second guide rod 2; a left L-shaped lever elbow joint 4-2-2 of the left L-shaped lever component 4 is sleeved on a left connecting shaft 3-8 in the left guide sleeve component 3 and can rotate around the left connecting shaft 3-8; the right L-shaped lever elbow joint of the right L-shaped lever component 6 is sleeved on the right connecting shaft in the right guide sleeve component 7 and can also rotate around the right connecting shaft.
Referring to fig. 1 and 13, the flat spring 9 is a rectangular plate-like structure, the flat spring 9 is fixedly mounted on the spring fixing seat 11 through the middle part thereof, two ends are in a cantilever state, and the flat spring 9 is not bent in an initial state; in the working process, the left rolling bearing 4-1 of the left L-shaped lever component 4 and the right rolling bearing 6-1 of the right L-shaped lever component 6 are respectively in sliding contact with the upper surface of the leaf spring 9, so that the leaf spring 9 is forced to be bent and deformed; and a specific load is applied to enable the vibration isolator to be in a balance position, the leaf spring 9 bends to enable the rigidity value of the negative rigidity mechanism to be minimum, and the rigidity value of the whole quasi-zero rigidity vibration isolator is approximately zero.
Referring to fig. 1 and 10, the spring fixing seat 11 is a rectangular flat plate type structural member, the spring fixing seat 11 is composed of a rectangular fixing seat main body and a rectangular fixing plate, the bottom end of the fixing seat main body is fixedly connected with a longitudinal symmetrical line of the fixing plate, the fixing seat main body is perpendicular to the fixing plate, the width of the fixing seat main body is equal to the length of the fixing plate, and 2 rows of bolt through holes for mounting bolts are uniformly formed in the fixing plate; the middle of fixing base main part top department is provided with a recess that is used for stationary blade spring 9, and the width of recess equals with the width of leaf spring 9, and the degree of depth of recess equals with the thickness of leaf spring 9, and the recess both sides are provided with the screw hole, and the screw hole is used for adopting bolted connection fixed spring clamp plate 10.
The spring pressing plate 10 is a rectangular flat-plate-shaped structural member, two through holes are processed on two sides of the spring pressing plate in the length direction, and the positions and the sizes of the through holes correspond to two threaded holes in the top of a fixing seat main body of the spring fixing seat 11;
referring to fig. 1 and 11, the left fixing plate 13 is a plate-type structural member composed of 2 rectangular plates, that is, composed of a fixing main plate and a fixing bottom plate, the width of the fixing main plate is equal to the length of the fixing bottom plate, two sets of through holes for mounting a first flange fixing plate 22 and a second flange fixing plate 23 are arranged on two sides of the upper end of the fixing main plate, the distance from the symmetric center of each set of through holes to the bottom end face of the left fixing plate 13 is equal, and the distance is greater than the distance from the top end face of the spring fixing seat 11 to the bottom end face thereof; two rows of bolt through holes are formed in the fixed base plate, the two rows of bolt through holes in the fixed base plate are symmetrically arranged on two sides of a longitudinal symmetry line of the fixed base plate, the bottom end of the fixed main plate is vertically and fixedly connected with the longitudinal symmetry line of the fixed base plate, the left fixed plate 13 is installed on the left side of the foundation plate 12, the right fixed plate 8 and the left fixed plate 13 are identical in structure, and the right fixed plate 8 and the left fixed plate 13 are symmetrically fixed on two sides of the foundation plate 12;
referring to fig. 1 and 14, the first flange fixing disk 22 is composed of a circular ring-shaped structural member and a disc-shaped structural member, the bottom end face of the circular ring-shaped structural member is fixedly connected with the upper end face of the disc-shaped structural member, the rotation center line of the circular ring-shaped structural member is collinear with the rotation center line of the disc-shaped structural member, the diameter of the inner ring of the circular ring-shaped structural member is equal to that of the central hole of the disc-shaped structural member and that of the first guide rod 1, the diameter of the outer ring of the circular ring-shaped structural member is smaller than the outer diameter of the disc-shaped structural member, four through holes are uniformly distributed on the disc-shaped structural member around the rotation center for being connected with the top end of the left fixing plate 13, and the structural sizes of the second flange fixing disk 23.
Referring to fig. 15 and 16, the operation principle of the cantilever leaf spring quasi-zero stiffness vibration isolator is as follows:
in an initial state, the left rolling bearing 4-1 and the right rolling bearing 6-1 at the short arm ends of the left L-shaped lever component 4 and the right L-shaped lever component 6 are respectively contacted with the upper surface of the leaf spring 9, and the leaf spring 9 is not deformed;
when the vibration isolation device is installed on the supporting platform 17, due to the action of gravity, the supporting platform 17 moves downwards, the left L-shaped lever elbow joint 4-2-2 of the left L-shaped lever component 4 is forced to move leftwards along the first guide rod 1 and the second guide rod 2, the left L-shaped lever component 4 rotates around the connecting shaft 3-8 in the left guide sleeve component 3 through the left L-shaped lever elbow joint 4-2-2, meanwhile, the right L-shaped lever elbow joint of the right L-shaped lever component 6 moves rightwards along the first guide rod 1 and the second guide rod 2, the right L-shaped lever component 6 rotates around the connecting shaft in the right guide sleeve component 7 through the right L-shaped lever elbow joint, and the leaf spring 9 is forced to bend and deform.
When the leaf spring 9 is initially bent, the left movement and the rotation of the left L-shaped lever component 4 are blocked, and the right movement and the rotation of the right L-shaped lever component 6 are simultaneously blocked, so that an upward supporting force in the vertical direction is provided for the quasi-zero stiffness vibration isolator; along with the gradual increase of the bending deformation of the leaf spring 9, the upward supporting force provided by the negative stiffness mechanism is increased and then reduced, and finally becomes a negative value; in the process that the upward supporting force provided by the negative stiffness mechanism is gradually reduced along with the increase of displacement, the dynamic stiffness is a negative value, and when the supporting platform 17 moves downwards, the dimensionless stiffness k of the quasi-zero stiffness vibration isolator negative stiffness mechanism in the formula 2 is enabled to benAnd (3) when the position reaches the minimum value, the dynamic stiffness value provided by the negative stiffness mechanism is negative and reaches the minimum value, the dynamic stiffness value is added with the stiffness of the positive stiffness mechanism, the dynamic stiffness of the whole quasi-zero stiffness vibration isolator reaches zero by selecting a proper positive stiffness spring stiffness parameter, the system is at a zero stiffness point at the moment, namely the balance position shown in figure 2, and when the quasi-zero stiffness vibration isolator is at the position, the k in the formula (3) isqIs zero. When the position of the quasi-zero stiffness vibration isolator deviates from a zero stiffness point, the dynamic stiffness value of the negative stiffness mechanism is increased and added with the stiffness of the positive stiffness mechanism, so that the stiffness value of the whole quasi-zero stiffness vibration isolator is always larger than or equal to zero.
Under the condition of specific parameters, the relation curve of the dimensionless storage force and the dimensionless displacement of the quasi-zero stiffness vibration isolator is shown in figure 16, and the relation is
Figure BDA0002672826110000111
In the formula:
Figure BDA0002672826110000121
in order to realize the dimensionless displacement of the quasi-zero stiffness vibration isolator,
Figure BDA0002672826110000122
the varying displacement of the load platform 17 of the quasi-zero stiffness isolator relative to the zero point of the base plate 12,
Figure BDA0002672826110000123
for displacement of the load platform 17 of the quasi-zero stiffness isolator relative to the base plate 12,
l1the distance between the axle center of the left L-shaped lever elbow joint 4-2-2 in the left L-shaped lever component 4 and the axle center of the left rolling bearing 4-1 is called the small arm length in the left L-shaped lever component 4 for short,
l2the distance between the axis of a left L-shaped lever elbow joint 4-2-2 in the left L-shaped lever component 4 and the center of a through hole in a U-shaped fork in a left L-shaped lever long-arm connector 4-3 is called the length of a large arm in the left L-shaped lever component 4 for short, d is the distance between the flat surfaces formed by the leaf spring 9, the first guide rod 1 and the second guide rod 2,
Figure BDA0002672826110000124
the non-dimensional storage force generated by the self deformation of the quasi-zero stiffness vibration isolator,
Fqin order to store the force generated by the self deformation of the quasi-zero stiffness vibration isolator,
Figure BDA0002672826110000125
for a specific deformation of the leaf spring 9The critical force of (a) is,
i is the moment of inertia of the cross section of the leaf spring 9 about the neutral axis,
e is the modulus of elasticity of the material used for the leaf spring 9,
Figure BDA0002672826110000126
which is a ratio of the sum of the rigidities of the left coil spring 14 and the right coil spring 21 to the equivalent rigidity of the leaf spring 9,
k is the sum of the rigidities of the left coil spring 14 and the right coil spring 21,
Figure BDA0002672826110000127
is the equivalent stiffness of the leaf spring 9,
Figure BDA0002672826110000131
the leaf spring 9 and the first guide rod 1 and the second guide rod 2 form a dimensionless distance between planes,
Figure BDA0002672826110000132
the ratio of the length of the large arm to the length of the small arm in the left L-shaped lever member 4,
Figure BDA0002672826110000133
the included angle between the residual undeformed plane of the flat spring 9 and the horizontal plane caused by the bending deformation of the flat spring 9 is shown in the specification, and the relation between the dimensionless rigidity and the dimensionless displacement of the negative rigidity mechanism in the quasi-zero rigidity vibration isolator is shown in the specification
Figure BDA0002672826110000134
In the formula:
Figure BDA0002672826110000135
is a quasi-zero steelThe dimensionless rigidity of the negative rigidity mechanism in the vibration isolator is measured,
knin order to achieve the stiffness of the negative stiffness mechanism in the quasi-zero stiffness vibration isolator,
Figure BDA0002672826110000136
is the intermediate variable(s) of the variable,
Figure BDA0002672826110000137
the derivative of the angle of the remaining undeformed plane of the leaf spring 9 with the horizontal plane caused by the bending deformation of the leaf spring 9 with respect to the dimensionless displacement,
the relation curve of the dimensionless rigidity and the dimensionless displacement of the quasi-zero rigidity vibration isolator is shown in figure 15, and the relation is
Figure BDA0002672826110000138
In the formula:
Figure BDA0002672826110000139
for the total dimensionless stiffness of the quasi-zero stiffness isolator,
kqthe total rigidity of the quasi-zero rigidity vibration isolator is achieved.
In fig. 14 and 15, u is 0, and represents that the support platform 17 is moved down to a position where the axis of the left L-shaped lever long arm 4-2-3 of the left L-shaped lever member 4 and the axis of the right L-shaped lever long arm of the right L-shaped lever member 6 are respectively parallel to the surface of the base plate 12, and the positive direction of u is set vertically downward.

Claims (10)

1. The quasi-zero stiffness vibration isolator for the cantilever leaf spring is characterized by comprising a foundation plate (12), a load platform (17), a positive stiffness mechanism and a negative stiffness mechanism;
the positive stiffness mechanism comprises a left spring damping guide mechanism and a right spring damping guide mechanism;
the negative stiffness mechanism comprises a right fixed plate (8), a spring fixed seat (11), a left fixed plate (13) and a supporting rod (18);
the foundation plate (12) is horizontally placed, and the load platform (17) is horizontally placed and positioned right above the foundation plate (12); the left spring damping guide mechanism and the right spring damping guide mechanism are vertically arranged between the foundation plate (12) and the load platform (17) and positioned at the left end and the right end of the foundation plate (12) and the load platform (17), the top end of the left spring damping guide mechanism and the right spring damping guide mechanism is fixedly connected with the bottom surface of the load platform (17), and the bottom end of the left spring damping guide mechanism and the right spring damping guide mechanism is fixedly connected with the upper surface of the foundation plate (12); the bottom end of the negative stiffness mechanism is installed on a foundation plate (12) between the left spring damping guide mechanism and the right spring damping guide mechanism through a right fixing plate (8), a spring fixing seat (11) and a left fixing plate (13), and the top end of the negative stiffness mechanism is fixedly connected with the center of the bottom surface of the load platform (17) through a support rod (18).
2. The cantilever flat spring quasi-zero stiffness vibration isolator according to claim 1, wherein the negative stiffness mechanism further comprises a first guide rod (1), a second guide rod (2), a left guide sleeve component (3), a left L-shaped lever component (4), a support rod connector (5), a right L-shaped lever component (6), a right guide sleeve component (7), a flat spring (9) and a spring pressing plate (10);
the spring fixing seat (11) is installed at the center of the foundation plate (12), the left fixing plate (13) and the right fixing plate (8) are symmetrically installed on the left side and the right side of the spring fixing seat (11) in parallel, and the left fixing plate (13) and the right fixing plate (8) are located on the inner sides of a left spiral spring (14) and a right spiral spring (21) in the left spring damping guide mechanism and the right spring damping guide mechanism; the leaf springs (9) are arranged in the grooves at the top ends of the spring fixing seats (11) in a bilateral symmetry mode and are fixed with the bolts through spring pressing plates (10); the first guide rod (1) and the second guide rod (2) are arranged at the upper ends of the left fixing plate (13) and the right fixing plate (8) in parallel, and the distances from the first guide rod (1) and the second guide rod (2) to the upper surface of the foundation plate (12) are equal; the left guide sleeve component (3) and the right guide sleeve component (7) are sleeved on the first guide rod (1) and the second guide rod (2), and the left guide sleeve component (3) and the right guide sleeve component (7) are in sliding connection with the first guide rod (1) and the second guide rod (2); the left L-shaped lever component (4) and the right L-shaped lever component (6) are sleeved on the left guide sleeve component (3) and the right guide sleeve component (7) through the middle parts of the left L-shaped lever component (4) and the right L-shaped lever component (6) and the left guide sleeve component (3) and the right guide sleeve component (7) in a rotating connection mode, the top ends of the left L-shaped lever component (4) and the right L-shaped lever component (6) are in rotating connection with the supporting rod connector (5) through pin shafts, and the supporting rod connector (5) is fixedly connected with the center of the bottom end face of the load platform (17) through the supporting rod (18); the left L-shaped lever component (4) is in contact connection with the bottom end of the right L-shaped lever component (6) and the upper surface of the leaf spring (9).
3. The cantilever leaf spring quasi-zero stiffness vibration isolator according to claim 2, wherein the left L-shaped lever component (4) consists of a left rolling bearing (4-1), a left L-shaped lever body (4-2) and a left L-shaped lever long arm connector (4-3);
the left L-shaped lever body (4-2) consists of a left L-shaped lever short arm (4-2-1), a left L-shaped lever elbow joint (4-2-2) and a left L-shaped lever long arm (4-2-3);
the top end of the left L-shaped lever short arm (4-2-1) and the left end of the left L-shaped lever long arm (4-2-3) are respectively welded and fixed on the outer cylindrical surface of the left L-shaped lever elbow joint (4-2-2), the left L-shaped lever short arm (4-2-1) is positioned below the left L-shaped lever elbow joint (4-2-2), the left L-shaped lever long arm (4-2-3) is positioned on the right surface of the left L-shaped lever elbow joint (4-2-2), the left L-shaped lever short arm (4-2-1) and the rotation axis of the left L-shaped lever long arm (4-2-3) are mutually and vertically intersected, and the rotation axis of the left L-shaped lever short arm (4-2-1) and the rotation axis of the left L-shaped lever long arm (4-2-3) are perpendicularly intersected on the same plane On the surface;
the left L-shaped lever long arm connector (4-3) is in threaded connection with the right end of the left L-shaped lever long arm (4-2-3), the left rolling bearing (4-1) is fixed at the bottom end of the left L-shaped lever short arm (4-2-1) through a pin shaft, and an inner bearing ring of the left rolling bearing (4-1) is in interference fit with the pin shaft.
4. The quasi-zero stiffness vibration isolator of the cantilever leaf spring according to claim 2, wherein the left guide sleeve component (3) consists of a first fixed sleeve (3-1), a first linear bearing (3-2), a first bearing baffle ring (3-3), a second linear bearing (3-4), a second bearing baffle ring (3-5), a second fixed sleeve (3-6), a third bearing baffle ring (3-7), a connecting shaft (3-8) and a fourth bearing baffle ring (3-9);
the first fixing sleeve (3-1) is sleeved on the first linear bearing (3-2), the first bearing baffle ring (3-3) and the fourth bearing baffle ring (3-9) are installed in bearing baffle ring grooves at two ends of the first linear bearing (3-2), and the first bearing baffle ring (3-3) is in contact connection with the inner side end face of the fourth bearing baffle ring (3-9) and two end faces of a large circular ring body in the first fixing sleeve (3-1); the second fixing sleeve (3-6) is sleeved on the second linear bearing (3-4), the second bearing baffle ring (3-5) and the third bearing baffle ring (3-7) are arranged in bearing baffle ring grooves at two ends of the second linear bearing (3-4), and the second bearing baffle ring (3-5) is in contact connection with the inner side end face of the third bearing baffle ring (3-7) and two end faces of a large circular ring body in the second fixing sleeve (3-6); one end of the connecting shaft (3-8) is fixedly arranged in the small connecting hole on the first fixing sleeve (3-1), the other end of the connecting shaft (3-8) is fixedly arranged in the small connecting hole on the second fixing sleeve (3-6), and the rotary axis of the connecting shaft (3-8) is vertically intersected with the rotary axis of the first linear bearing (3-2) and the second linear bearing (3-4).
5. The vibration isolator of claim 1, wherein the left spring damping guide mechanism comprises a left coil spring (14), a left guide post (15) and a left guide sleeve (16);
the left spiral spring (14) is a positive stiffness spring, the sum of stiffness values of the left spiral spring (14) and a right spiral spring (21) in the right spring damping guide mechanism is equal to or greater than the absolute value of the minimum negative stiffness of the negative stiffness mechanism, the left spiral spring (14) is fixedly installed between a base plate (12) and a load platform (17) which are aligned in parallel, the left spiral spring (14) is perpendicular to the base plate (12) and the load platform (17) and is arranged at the left end of the base plate (12) and the load platform (17), the top end of the left spiral spring (14) is fixedly connected with a groove at the left end of the load platform (17), and the bottom end of the left spiral spring (14) is fixedly connected with a groove at the left end of the base plate (12);
the left guide sleeve (16) is sleeved on the left guide pillar (15) and is in sliding connection with the left guide pillar (15), the left guide sleeve (16) and the left guide pillar (15) which are sleeved together are installed in the left spiral spring (14), the rotary axis of the left guide sleeve (16) and the left guide pillar (15) and the rotary axis of the left spiral spring (14) are collinear, the top end of the left guide sleeve (16) is fixedly connected with the left end of the load platform (17), and the bottom end of the left guide pillar (15) is fixedly connected with the left end of the foundation plate (12).
6. The vibration isolator of claim 1 wherein said right spring damping guide mechanism comprises a right coil spring (21), a right guide post (20) and a right guide sleeve (19);
the right spiral spring (21) is a positive stiffness spring, the sum of stiffness values of the right spiral spring (21) and a left spiral spring (14) in the left spring damping guide mechanism is equal to or greater than the absolute value of the minimum negative stiffness of the negative stiffness mechanism, the right spiral spring (21) and the left spiral spring (14) are identical in structure, the right spiral spring (21) is installed and fixed between a base plate (12) and a load platform (17) which are aligned in parallel, the right spiral spring (21) is perpendicular to the base plate (12) and the load platform (17) and is symmetrically arranged at the right ends of the base plate (12) and the load platform (17) with the left spiral spring (14), the top end of the right spiral spring (21) is fixedly connected with a groove at the right end of the load platform (17), and the bottom end of the right spiral spring (21) is fixedly connected with a groove at the right end of the base plate (12);
the structure of the right guide post (20) is the same as that of the left guide post (15) in the left spring damping guide mechanism, the right guide post (20) is installed in a right spiral spring (21) positioned at the right ends of the foundation plate (12) and the load platform (17), and the bottom end of the right guide post (20) is fixedly connected with the right end of the foundation plate (12); the structure of the right guide sleeve (19) is the same as that of the left guide sleeve (16) in the left spring damping guide mechanism, the right guide sleeve (19) is installed in a right spiral spring (21) at the right end of the foundation plate (12) and the load platform (17) and sleeved on the right guide post (20), the right guide sleeve and the right guide post are in sliding connection, the rotary axis of the right guide sleeve (19) and the right guide post (20) and the rotary axis of the right spiral spring (21) are collinear, and the top end of the right guide sleeve (19) is fixedly connected with the right end of the load platform (17).
7. The quasi-zero stiffness vibration isolator of the cantilever leaf spring as claimed in claim 1, wherein the spring fixing seat (11) is a rectangular flat plate type structural member, the spring fixing seat (11) is composed of a rectangular fixing seat main body and a rectangular fixing base at the bottom, the bottom end of the fixing seat main body is fixedly connected with the longitudinal symmetry line of the fixing base, the fixing seat main body is perpendicular to the fixing base, the width of the fixing seat main body is equal to the length of the fixing base, and the fixing base is uniformly provided with 2 rows of bolt through holes for mounting bolts; the middle of the top of the fixing seat main body is provided with a groove for fixing the leaf spring (9), the width of the groove is equal to that of the leaf spring (9), the depth of the groove is equal to the thickness of the leaf spring (9), threaded holes are formed in two sides of the groove, and the threaded holes are used for fixedly connecting the spring pressing plate (10) through bolts.
8. The vibration isolator of claim 1, wherein the left fixing plate (13) is a plate type structure member composed of 2 rectangular plates, the left fixing plate (13) is composed of a fixing main plate and a fixing bottom plate, the width of the fixing main plate is equal to the length of the fixing bottom plate, two groups of through holes for mounting a first guide rod (1) and a second guide rod (2) are symmetrically arranged on two sides of the upper end of the fixing main plate, the distance from the symmetrical center of each group of through holes to the bottom end face of the left fixing plate (13) is equal, and the distance is greater than the distance from the top end face of the spring fixing seat (11) to the bottom end face thereof; two rows of bolt through holes are formed in the fixed base plate, the two rows of bolt through holes in the fixed base plate are symmetrically arranged on two sides of a longitudinal symmetrical line of the fixed base plate, the bottom end of the fixed main plate is vertically and fixedly connected with the longitudinal symmetrical line of the fixed base plate, the left fixed plate (13) and the right fixed plate (8) are identical in structure, and the left fixed plate (13) and the right fixed plate (8) are symmetrically arranged on the left side and the right side of the spring fixed seat (11).
9. The vibration isolator of claim 1, wherein the base plate (12) is a rectangular flat plate structure, the left and right sides of the base plate (12) are respectively provided with a stepped hole and four threaded holes, the left stepped hole for mounting the left guide post (15) and the four threaded holes for mounting the left fixing plate (13) are respectively arranged symmetrically with the right stepped hole for mounting the right guide post (20) and the four threaded holes for mounting the right fixing plate (8) about the longitudinal and transverse symmetrical center line of the base plate (12), the center distance between the left and right stepped holes is larger than the distance between the left and right threaded holes, and the peripheries of the left and right stepped holes on the base plate (12) are respectively provided with circular grooves for mounting the bottom ends of the left coil spring (14) and the right coil spring (21), and the rotary axes of the left and right stepped holes are collinear with the rotary axes of the left and right circular grooves respectively, four threaded holes for mounting the spring fixing seat (11) are arranged at the middle position of the foundation plate (12), and the four threaded holes for mounting the spring fixing seat (11) are symmetrically arranged relative to the longitudinal and transverse symmetrical center lines of the foundation plate (12).
10. The quasi-zero stiffness vibration isolator of claim 1 wherein, load platform (17) be rectangle flat plate structure spare, load platform's the left and right sides is processed respectively and is had a shoulder hole, the left shoulder hole that is used for installing left guide pin bushing (16) is symmetrical arrangement with the vertical and horizontal symmetrical center line that is used for installing right guide pin bushing (19) shoulder hole on right side about load platform (17), the left shoulder hole of load platform (17) is adjusted well with the left shoulder hole position of foundatin plate (12), the shoulder hole on load platform (17) right side is adjusted well with the shoulder hole position on foundatin plate (12) right side, the lower surface of load platform (17) and be provided with the annular top recess that is used for installing left coil spring (14) and right coil spring (21) respectively around two shoulder holes, the intermediate position of load platform (17) evenly arranges four screw holes that are used for fixed support pole (18).
CN202021960720.XU 2020-09-09 2020-09-09 Quasi-zero stiffness vibration isolator with cantilever leaf springs Active CN212377182U (en)

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