CN115431852A - Quasi-zero rigidity vibration isolation device and child chair - Google Patents
Quasi-zero rigidity vibration isolation device and child chair Download PDFInfo
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- CN115431852A CN115431852A CN202210542296.4A CN202210542296A CN115431852A CN 115431852 A CN115431852 A CN 115431852A CN 202210542296 A CN202210542296 A CN 202210542296A CN 115431852 A CN115431852 A CN 115431852A
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- 230000033001 locomotion Effects 0.000 claims description 10
- 238000013459 approach Methods 0.000 claims description 5
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- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 9
- 238000006073 displacement reaction Methods 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
- B60N2/26—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles for children
- B60N2/28—Seats readily mountable on, and dismountable from, existing seats or other parts of the vehicle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
- B60N2/26—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles for children
- B60N2/28—Seats readily mountable on, and dismountable from, existing seats or other parts of the vehicle
- B60N2/283—Seats readily mountable on, and dismountable from, existing seats or other parts of the vehicle suspended
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention relates to a quasi-zero stiffness vibration isolation device and a child chair, wherein the adjustment of the negative stiffness of a first elastic sheet and the positive stiffness of a second elastic sheet realizes the mutual offset of the positive stiffness and the negative stiffness, so that the quasi-zero stiffness adjustment of the vibration isolation device is realized, and a bracket can not influence a load loaded by a loading piece, namely the vibration isolation effect is realized, the vibration between a base and a seat plate is isolated, and the comfort level of children on the seat plate is ensured.
Description
Technical Field
The invention relates to the technical field of child safety seats, in particular to a quasi-zero stiffness vibration isolation device and a child seat.
Background
With the continuous importance of the safety of children, various automobile child seats come into play, which play an important role in reducing the death or serious injury of children in traffic accidents.
Since the body of the child is not completely developed, the child is more sensitive to jolting and vibration during driving and even can cause damage to the health of the child, and therefore, the comfort level of the seat is also important for the safety of the child. However, most of the child seats on the market today mainly have the following disadvantages: 1. the vibration can be reduced to a certain degree, and the vibration cannot be isolated; 2. the best shock absorption effect cannot be achieved by adapting the shock absorption mechanism according to the weight of the child.
Disclosure of Invention
Based on the above description, the invention provides a quasi-zero stiffness vibration isolation device, which is used for solving the technical problem that the vibration isolation device in the prior art can only reduce vibration in a certain range but cannot isolate vibration.
The technical scheme for solving the technical problems is as follows:
a quasi-zero stiffness vibration isolation device comprises a bracket, a negative stiffness component and a positive stiffness component;
the bracket comprises first guide rails erected at two ends of the strut;
the negative stiffness component comprises a loading piece, a first sliding block, a first elastic sheet, a negative stiffness adjusting mechanism and two pressing pieces, wherein the first sliding block is slidably mounted on the first guide rail, the loading piece is connected to one end of the first sliding block along the first guide rail, the middle part of the first elastic sheet is fixedly connected to the first sliding block, the two pressing pieces are symmetrically fixed at two ends of the first elastic sheet, and the negative stiffness adjusting mechanism is connected with the two pressing pieces and is used for driving the two pressing pieces to be close to or far away from each other so as to enable the middle part of the first elastic sheet to arch to one end close to the loading piece to form a pre-tightening state;
the positive rigidity component comprises a connecting piece, a second slider, a second elastic sheet, a positive rigidity adjusting mechanism, a sliding frame and two supporting pieces, wherein the second slider is slidably installed in the first guide rail, the connecting piece is used for fixedly connecting the middle part of the first elastic sheet with the middle part of the second elastic sheet, the sliding frame is fixedly connected with the second slider, the two supporting pieces are symmetrically arranged on two sides of the middle part of the second elastic sheet, the supporting pieces are slidably installed on the sliding frame and are in sliding connection with the second elastic sheet, the second elastic sheet is located in two, the length between the supporting pieces is the effective length, the positive rigidity adjusting mechanism is connected with the two supporting pieces, and the two supporting pieces are driven to be close to or be away from each other so as to change the effective length of the second elastic sheet.
Compared with the prior art, the technical scheme of the application has the following beneficial technical effects:
according to the quasi-zero stiffness vibration isolation device, in an initial state, the middle part of the first elastic sheet arches towards one end close to the loading part to form a pre-tightening state, after a load is applied to the loading part, the middle part of the first elastic sheet deforms under the extrusion of the first sliding block, at the moment, the structure of the first elastic sheet is changed into a negative stiffness structure with larger load and smaller displacement in a certain interval, and when the loading part and the pressing part are driven by the negative stiffness adjusting mechanism to move to be close to or away from each other, the negative stiffness of the first elastic sheet can be changed; meanwhile, the second elastic sheet is a positive stiffness structure with larger load and larger displacement, and the length of the second elastic sheet participating in deformation is the effective length, so that the positive stiffness of the second elastic sheet can be changed by changing the effective length, and the quasi-zero stiffness adjustment of the vibration isolation device is realized by mutually offsetting the positive stiffness and the negative stiffness, so that the support can not influence the load loaded by the loading piece, and the vibration isolation effect is achieved.
On the basis of the technical scheme, the invention can be further improved as follows.
Furthermore, two ends of the pressing piece are provided with connecting parts, a prefabricated inclined plane is formed at the connecting position of the connecting parts and the first elastic sheet, the prefabricated inclined plane gradually approaches the loading piece from outside to inside along the direction of the first guide rail, and two ends of the first elastic sheet are connected to the prefabricated inclined plane.
Furthermore, the pressing piece comprises a pressing base and a fixing block, a mounting groove is formed in the pressing base, the fixing block is arranged on the mounting groove, and the prefabricated inclined plane is formed on one side of the fixing block.
Further, the support further comprises a bottom frame, the bottom frame is fixedly arranged below the first guide rail, the negative stiffness adjusting mechanism comprises a first driving motor, a first synchronous belt and two first synchronous wheels, the two first synchronous wheels are rotatably arranged on the bottom frame and symmetrically arranged on two sides of the middle portion of the first elastic sheet, the first synchronous belt is synchronously connected with the two first synchronous wheels, the first driving motor drives any one of the first synchronous wheels to rotate, the two first synchronous belts respectively form a first belt section and a second belt section on two sides of the first synchronous wheel, and the two lower ends of the pressing bases are respectively and fixedly connected with the first belt section and the second belt section.
Furthermore, the negative stiffness adjusting mechanism further comprises a second guide rail and two first synchronous sliding blocks; the second guide rail is fixedly arranged on the bottom frame, the two first synchronous sliding blocks are respectively connected to the lower end of the pressure applying base, and the first synchronous sliding blocks are fixed to the lower end of the pressure applying base in a one-to-one correspondence mode through fasteners.
Further, positive rigidity adjustment mechanism includes second driving motor, second hold-in range and two second synchronizing wheels, two rotatable the installing in of second synchronizing wheel on the carriage and symmetry set up in the both sides at the middle part of second shell fragment, second hold-in range synchronous connection is two the second synchronizing wheel, second driving motor drive is arbitrary the second synchronizing wheel rotates, the second hold-in range is in second synchronizing wheel both sides form third area section and fourth area section respectively, the carriage is in the both sides at the middle part of second shell fragment are formed with the spout, support piece slidable slide in the spout, support piece's lower extreme is connected respectively third area section and fourth area section.
Furthermore, a through hole penetrating through two sides of the supporting piece is formed in the supporting piece, and the end part of the second elastic piece penetrates through the through hole.
Furthermore, the device also comprises a pressing mechanism, wherein the pressing mechanism comprises a third driving motor, a screw rod and a pressing block, the pressing block is slidably mounted at the lower end of the first guide rail, the screw rod is connected with the pressing block through threads, and the third driving motor is mounted on the sliding frame and is in driving connection with the screw rod.
The application also provides a children's chair, it includes base, seat board, motion loading mechanism and foretell zero-quasi rigidity vibration isolation mounting, the support is fixed set up in on the base, the base include pedestal and vertical set up in guide bar on the pedestal, seat board movable mounting in the pedestal top, motion loading mechanism includes initiative wedge and passive wedge, initiative wedge fixed connection in the lower extreme of seat board, the lower extreme of initiative wedge have with the guiding hole of guide bar looks adaptation, passive wedge connect in loading piece keeps away from the one end of first slider, the initiative wedge with passive wedge passes through inclined plane contact cooperation, works as when the initiative wedge is down, promotes passive wedge is to being close to first slider one side slides, be provided with on the seat board also and be used for detecting the weight sensor that seat board up end bore thing weight, negative rigidity adjustment mechanism and positive rigidity adjustment mechanism all through a control system with the weight sensor connects, preset weight matching data in the control system and can be according to weight matching data control negative rigidity adjustment mechanism and positive rigidity adjustment mechanism's work, weight matching data includes that two supports between the distance between the arbitrary distance of the support piece.
The application provides a child chair, when the child sat on the seat board, the load was applyed to the loading piece through initiative wedge and passive wedge to the seat board, because quasi-zero rigidity vibration isolation mounting's support is fixed on the base, and the vibration between base and the seat board is isolated, has guaranteed child's comfort level on the seat board.
Furthermore, motion loading mechanism still includes vibration isolator and mounting panel, the loading member is kept away from the one end of first slider is connected with the mounting panel, the mounting panel with passive wedge passes through the vibration isolator is connected.
Drawings
FIG. 1 is a schematic structural view of a child chair according to an embodiment of the present invention;
FIG. 2 is a front view of bitmap 1;
FIG. 3 is a schematic structural view of the quasi-zero stiffness vibration isolation device of FIG. 1;
fig. 4 is a schematic view of an installation structure of the first elastic sheet in fig. 3;
fig. 5 is a schematic view of an initial early warning state of the first elastic sheet in fig. 3;
fig. 6 is a schematic structural view of the first elastic sheet in fig. 3 after a load is applied;
FIG. 7 is a graph of the displacement load relationship of FIG. 6;
FIG. 8 is a schematic structural view of a negative stiffness adjustment mechanism;
FIG. 9 is a schematic structural view of a positive stiffness adjustment mechanism;
fig. 10 is a control connection block diagram according to an embodiment of the present application.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It is to be understood that spatial relationship terms such as "under" \8230; under "," ' under 8230; \8230; under "\8230;," ' over 8230; over "", "" over "", etc., may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "at 8230; \8230; below" and "at 8230; \8230; below" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. The "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have transmission of electrical signals or data therebetween.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
As shown in fig. 1 to 10, the present embodiment provides a child seat including a base 1, a seat plate 2, a motion loading mechanism 3, and a quasi-zero stiffness vibration isolation device 4.
The base 1 comprises a base body 11 and a guide rod 12 vertically arranged on the base body, and the seat plate 2 is movably arranged above the base body 11; the motion loading mechanism 3 includes an active wedge 31 and a passive wedge 32, the active wedge 31 is fixedly connected to the lower end of the seat plate 2, the lower end of the active wedge 31 has a guide hole adapted to the guide rod 12, so that the seat plate 2 can move up and down relative to the seat body 11.
In the present embodiment, the quasi-zero stiffness vibration isolation device 4 includes a bracket 41, a negative stiffness assembly 42, and a positive stiffness assembly 43.
The bracket 41 is fixedly disposed on the base 1, and the bracket 41 includes a first guide rail 411 erected at two ends of a pillar 413.
The negative stiffness component comprises a loading piece 421, a first sliding block 422, a first elastic piece 423, a negative stiffness adjusting mechanism 424 and two pressing pieces 425.
The first sliding block 421 is slidably mounted on the first guide rail 411, the loading member 421 is connected to one end of the first sliding block 421 along the first guide rail 411, the middle portion of the first elastic piece 423 is fixedly connected to the first sliding block 422, in this embodiment, the first sliding block 422 is formed by combining two clamping blocks, a gap is formed between the two clamping blocks, and the first elastic piece 423 is clamped in the gap.
The two pressing pieces 46 are symmetrically fixed at two ends of the first elastic piece 44, and the negative stiffness adjusting mechanism 45 is connected with the two pressing pieces 46 and used for driving the two pressing pieces 46 to move close to or away from each other, so that the middle part of the first elastic piece 44 is arched towards one end close to the loading piece 42 to form a pre-tightening state.
The positive stiffness assembly comprises a connecting member 431, a second sliding block 432, a second elastic sheet 433, a positive stiffness adjusting mechanism 434, a sliding frame 435 and two supporting members 436.
Second slider 432 slidable install in first guide rail 411, connecting piece 431 is used for fixed connection the middle part of first shell fragment 423 with the middle part of second shell fragment 433, carriage 425 with second slider 432 fixed connection, two support piece 436 symmetry sets up the both sides in the middle part of second shell fragment 433, support piece 436 slidable install in on the carriage 435 and with second shell fragment 433 sliding connection, second shell fragment 433 is located two length between the support piece 436 is effective length, positive rigidity adjustment mechanism 434 is connected with two support pieces 436, owing to drive two support pieces 436 draw close each other or keep away from, in order to change the effective length of second shell fragment 433.
When the quasi-zero stiffness vibration isolation device 4 is in an initial state, the middle part of the first elastic sheet 423 arches towards one end close to the loading member 421 to form a pre-tightening state, that is, as shown in fig. 5, after a load is applied to the loading member 421, the middle part of the first elastic sheet 423 deforms under the extrusion of the first slider 422, and at this time, the structure of the first elastic sheet 423 is changed into a negative stiffness structure with larger load and smaller displacement in a certain interval, that is, as shown in fig. 6, the displacement load relationship is shown in fig. 7, and at this time, when the loading member 425 is driven by the negative stiffness adjusting mechanism 424 to move so as to be close to or far away from each other, the negative stiffness of the first elastic sheet 423 changes; under the driving of the connecting piece 431, the second elastic sheet 433 is arched towards the other side, and because the second elastic sheet 433 is a positive stiffness structure with larger load and larger displacement, the length of the positive stiffness structure participating in deformation is the effective length, the positive stiffness of the positive elastic sheet can be changed by changing the effective length, and the positive stiffness and the negative stiffness are mutually offset through the cooperative adjustment of the positive stiffness adjusting structure and the negative stiffness adjusting mechanism, so that the quasi-zero stiffness adjustment of the vibration isolation device is realized, further, the bracket 41 can not influence the load loaded by the loading piece 421, and the vibration isolation effect is achieved.
In the adjusting process, the second elastic sheet 433 is preferably adjusted to be at the position of the balance position point, and the vibration isolation effect is optimal.
The passive wedge 32 is connected to one end of the loading member 421 far away from the first slider 422, the active wedge 31 and the passive wedge 32 are in contact fit through a slope, when the active wedge 31 descends, the passive wedge 32 is pushed to slide towards one side near the first slider 422, namely when a child sits on the seat plate 2, the seat plate 2 moves downwards to drive the active wedge 31 to descend, and then the loading member is pushed to move towards one side near the first slider 422, so that loading is realized.
In order to realize the automatic adjustment of quasi-zero stiffness, a weight sensor 6 for detecting the weight of the object carried on the upper end surface of the seat plate 2 is arranged on the seat plate 2, the negative stiffness adjusting mechanism 424 and the positive stiffness adjusting mechanism 434 are both connected with the weight sensor 6 through a control system 5, weight matching data are preset in the control system 5 and can control the work of the negative stiffness adjusting mechanism and the positive stiffness adjusting mechanism according to the weight matching data, and the weight matching data comprise the distance between two pressure applying parts 46 and the distance between two supporting parts 436 under any weight in a certain weight range.
That is, when a child sits on the seat plate 2, the weight sensor 6 detects the weight of the child on the upper end surface of the seat plate 2, and then the negative stiffness adjusting mechanism 424 and the positive stiffness adjusting mechanism 434 adjust the distance between the two pressing members 46 and the distance between the two supporting members 436, so that the negative stiffness of the first elastic piece 423 and the positive stiffness of the second elastic piece 433 are just offset, and quasi-zero stiffness is realized, and the vibration of the base 1 does not affect the seat plate 2 at this time, and further the effect of isolating the vibration is realized.
Preferably, in order to enhance the vibration isolation effect, the motion loading mechanism 3 further includes a vibration isolation pad 33 and a mounting plate 34, one end of the loading member 421, which is far away from the first slider 422, is connected to the mounting plate 34, and the mounting plate 34 and the passive wedge 32 are connected through the vibration isolation pad 33.
In the embodiment of the present application, in order to ensure that the first resilient piece 423 always arches toward one end of the loading member 42 when the two pressing members 425 approach each other, a pre-formed slope 425a is formed at a position where the pressing members 425 and the first resilient piece 423 are connected, the pre-formed slope 425a gradually approaches the loading member 421 from the outside to the inside in the direction of the first guide rail 411, and both ends of the first resilient piece 423 are connected to the pre-formed slope 425a.
Preferably, the pressing member 425 includes a pressing base 4251 and a fixing block 4252, the pressing base 4211 is formed with an installation groove, the fixing block 4252 is arranged on the installation groove, and the pre-formed slope is formed at one side of the fixing block.
In this embodiment, the bracket 41 further includes a bottom frame 412, and the bottom frame 412 is fixedly disposed below the first guide rail 411.
The negative stiffness adjusting mechanism 424 comprises a first driving motor 4241, a first synchronizing belt 4242 and two first synchronizing wheels 4243, the two first synchronizing wheels 4243 are rotatably mounted on the underframe 412 and symmetrically arranged on two sides of the middle of the first elastic piece 423, the first synchronizing belt 4242 is synchronously connected with the two first synchronizing wheels 4243, the first driving motor 4241 drives any one of the first synchronizing wheels 4243 to rotate, the first synchronizing belt 4242 forms a first belt section and a second belt section on two sides of the first synchronizing wheel 4243 respectively, and the lower ends of the two pressure applying bases 4251 are fixedly connected to the first belt section and the second belt section respectively.
When the first driving motor 4241 drives the first synchronizing wheel 4243 to rotate, the first synchronizing belt 4242 rotates along with the first synchronizing wheel, the first belt section and the second belt section move in opposite directions respectively, and then the two pressing bases 42 are driven to move towards each other or move away from each other, and as the two pressing bases 4251 are connected with the first elastic sheet 423, the heights of the two ends of the first elastic sheet 423 close to the arch part are increased or the heights of the two ends of the first elastic sheet 423 far away from the arch part are reduced, so that the adjustment of the negative stiffness of the first elastic sheet 423 is realized.
In order to ensure the stability of the movement of the pressing base 4251, the negative stiffness adjustment mechanism 424 further comprises a second guide rail 4244 and two first synchronization sliders 4245; the second guide rail 4244 is fixedly disposed on the base frame 412, two first synchronization sliders 4245 are respectively connected to the lower end of the pressing base 4251, the first synchronization sliders 4245 are correspondingly fixed to the lower end of the pressing base 4251 by fasteners 4246, wherein the fasteners 4246 are preferably timing belt fixing plates.
Correspondingly, the positive stiffness adjusting mechanism 434 includes a second driving motor 4341, a second synchronous belt 4342 and two second synchronous wheels 4343, the two second synchronous wheels 4343 are rotatably installed on the sliding frame 435 and symmetrically disposed at two sides of the middle portion of the second elastic sheet 433, the second synchronous belt 4342 is synchronously connected to the two second synchronous wheels 4343, the second driving motor 4341 drives any one of the second synchronous wheels 4343 to rotate, the second synchronous belt 4342 respectively forms a third belt section and a fourth belt section at two sides of the second synchronous wheel 4343, the sliding frame 435 is formed with sliding grooves at two sides of the middle portion of the second elastic sheet, the support member 436 slidably slides in the sliding grooves, and the lower end of the support member 436 is respectively connected to the third belt section and the fourth belt section.
When the second driving motor 4341 drives the second synchronizing wheel 4343 to rotate, the second synchronizing belt 4342 rotates along with the second synchronizing wheel, the third belt segment and the fourth belt segment move in opposite directions respectively, so as to drive the two supporting pieces 436 to move in opposite directions or move away from each other, and the length of the second elastic piece between the two supporting pieces 436, that is, the effective length, is increased or shortened due to the sliding connection between the supporting pieces 436 and the second elastic piece 433, so that the adjustment of positive stiffness is realized.
Preferably, a through hole penetrating through two sides of the support member 436 is formed on the support member 436, and an end portion of the second elastic sheet 433 penetrates through the through hole.
It can be understood that the connection between the negative stiffness adjusting mechanism 424 and the positive stiffness adjusting mechanism 434 and the control system 5 is the electrical connection between the first driving motor 4241 and the second driving motor 4341 and the control system 5, and the control system 5 realizes the matching adjustment of the negative stiffness and the positive stiffness by controlling the rotation of the first driving motor 4241 and the second driving motor 4341.
In order to ensure that the adjustment of the positive and negative stiffness can be adapted to different obtained weight scenes, the quasi-zero stiffness vibration isolation device further comprises a pressing mechanism 44, wherein the pressing mechanism 44 comprises a third driving motor, a screw rod 441 and a pressing block 442, the pressing block 442 is slidably mounted at the lower end of the first guide rail 411, the screw rod 441 is in threaded connection with the pressing block 442, and the third driving motor is mounted on the sliding frame 435 and is in driving connection with the screw rod 441.
When the third driving motor rotates, the lead screw 441 is driven to rotate, so that the compressing block 442 compresses or loosens the first guide rail 411, when quasi-zero stiffness needs to be adjusted, and the compressing block 442 loosens the first guide rail 411, the sliding frame 435 and the first slider 421 can slide relative to the first guide rail 411, so that loading and matching adjustment of positive and negative stiffness can be further performed, after the adjustment is completed, the compressing block 442 compresses the first guide rail 411, at the moment, the whole children chair is in a quasi-zero stiffness state, and displacement of the base 1 relative to the seat plate 2 in a certain range cannot generate load on the seat plate 2, namely vibration is isolated, so that the best shock absorption effect according to weight adaptation of children can be realized.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A quasi-zero stiffness vibration isolation device is characterized by comprising a bracket, a negative stiffness component and a positive stiffness component;
the bracket comprises first guide rails erected at two ends of the strut;
the negative stiffness component comprises a loading piece, a first sliding block, a first elastic sheet, a negative stiffness adjusting mechanism and two pressing pieces, wherein the first sliding block is slidably arranged on the first guide rail, the loading piece is connected to one end of the first sliding block along the first guide rail, the middle part of the first elastic sheet is fixedly connected to the first sliding block, the two pressing pieces are symmetrically fixed at two ends of the first elastic sheet, and the negative stiffness adjusting mechanism is connected with the two pressing pieces and is used for driving the two pressing pieces to approach or keep away from each other so as to enable the middle part of the first elastic sheet to arch towards one end close to the loading piece to form a pre-tightening state;
positive rigidity subassembly includes connecting piece, second slider, second shell fragment, positive rigidity adjustment mechanism, carriage and two support piece, second slider slidable install in first guide rail, the connecting piece be used for fixed connection the middle part of first shell fragment with the middle part of second shell fragment, the carriage with second slider fixed connection, two the support piece symmetry sets up the both sides at the middle part of second shell fragment, support piece slidable install in on the carriage and with second shell fragment sliding connection, the second shell fragment is located two length between the support piece is effective length, positive rigidity adjustment mechanism is connected with two support piece, because drive two support piece draw close each other or keep away from to change the effective length of second shell fragment.
2. The quasi-zero stiffness vibration isolation device according to claim 1, wherein a pre-formed slope is formed at a position where the pressing member is connected to the first resilient plate, the pre-formed slope gradually approaches the loading member from outside to inside along a direction of the first rail, and both ends of the first resilient plate are connected to the pre-formed slope.
3. The quasi-zero stiffness vibration isolation device according to claim 2, wherein the pressing member includes a pressing base and a fixing block, the pressing base has a mounting groove formed thereon, the fixing block is disposed on the mounting groove, and the pre-formed slope is formed on one side of the fixing block.
4. The quasi-zero stiffness vibration isolation device according to claim 3, wherein the bracket further comprises a bottom frame fixedly arranged below the first guide rail, the negative stiffness adjusting mechanism comprises a first driving motor, a first synchronizing belt and two first synchronizing wheels, the two first synchronizing wheels are rotatably arranged on the bottom frame and symmetrically arranged on two sides of the middle part of the first elastic sheet, the first synchronizing belt is synchronously connected with the two first synchronizing wheels, the first driving motor drives any one of the first synchronizing wheels to rotate, the first synchronizing belt respectively forms a first belt section and a second belt section on two sides of the first synchronizing wheel, and the lower ends of the two pressing bases are respectively and fixedly connected to the first belt section and the second belt section.
5. The quasi-zero stiffness vibration isolation device according to claim 4, wherein the negative stiffness adjustment mechanism further comprises a second guide rail and two first synchronization sliders; the second guide rail is fixedly arranged on the bottom frame, the two first synchronous sliding blocks are respectively connected to the lower end of the pressure applying base, and the first synchronous sliding blocks are fixed to the lower end of the pressure applying base in a one-to-one correspondence mode through fasteners.
6. The quasi-zero stiffness vibration isolation device according to claim 1, wherein the positive stiffness adjustment mechanism includes a second driving motor, a second synchronous belt and two second synchronous wheels, the two second synchronous wheels are rotatably mounted on the sliding frame and symmetrically disposed on two sides of the middle portion of the second elastic sheet, the second synchronous belt is synchronously connected to the two second synchronous wheels, the second driving motor drives any one of the second synchronous wheels to rotate, the second synchronous belt forms a third belt section and a fourth belt section on two sides of the second synchronous wheel, sliding grooves are formed on two sides of the middle portion of the second elastic sheet, the supporting member slides in the sliding grooves, and the lower end of the supporting member is connected to the third belt section and the fourth belt section, respectively.
7. The quasi-zero stiffness vibration isolation device according to claim 6, wherein the supporting member is formed with a through hole penetrating both sides thereof, and an end of the second resilient piece is inserted through the through hole.
8. The quasi-zero stiffness vibration isolation device according to claim 6, further comprising a hold-down mechanism, wherein the hold-down mechanism comprises a third driving motor, a lead screw and a hold-down block, the hold-down block is slidably mounted at the lower end of the first guide rail, the lead screw is in threaded connection with the hold-down block, and the third driving motor is mounted on the sliding frame and in driving connection with the lead screw.
9. A children's chair, comprising a base, a seat plate, a motion loading mechanism and the quasi-zero stiffness vibration isolation device according to any one of claims 1 to 8, wherein the bracket is fixedly arranged on the base, the base comprises a seat body and a guide rod vertically arranged on the seat body, the seat plate is movably arranged above the seat body, the motion loading mechanism comprises an active wedge and a passive wedge, the active wedge is fixedly connected to the lower end of the seat plate, the lower end of the active wedge is provided with a guide hole matched with the guide rod, the passive wedge is connected to one end of the loading member far away from the first sliding block, the active wedge and the passive wedge are in contact fit through inclined planes, when the active wedge descends, the passive wedge is pushed to slide towards one side close to the first sliding block, the seat plate is provided with a weight sensor for detecting the weight of the load on the upper end face of the seat plate, the negative stiffness adjusting mechanism and the positive stiffness adjusting mechanism are both connected with the weight sensor through a control system, the control system is preset with weight matching data and can control the negative stiffness adjusting mechanism and the positive stiffness adjusting mechanism according to the weight matching data, and the working stiffness adjusting mechanism comprises a certain distance between the two supports within a certain range.
10. The children's chair of claim 9, wherein the motion loading mechanism further comprises a vibration isolator and a mounting plate, the mounting plate is connected to an end of the loading member remote from the first slider, and the mounting plate and the passive wedge are connected through the vibration isolator.
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| CN202210542296.4A CN115431852B (en) | 2022-05-17 | 2022-05-17 | Quasi-zero rigidity vibration isolation device and child chair |
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| CN202210542296.4A CN115431852B (en) | 2022-05-17 | 2022-05-17 | Quasi-zero rigidity vibration isolation device and child chair |
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| CN216242018U (en) * | 2021-04-28 | 2022-04-08 | 北京市劳动保护科学研究所 | Quasi-zero stiffness vibration isolation device containing mechanical frequency modulation type dynamic vibration absorber |
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| GB838612A (en) * | 1957-07-30 | 1960-06-22 | Nat Res Dev | Improvements in or relating to low stiffness spring units |
| JP2004236830A (en) * | 2003-02-05 | 2004-08-26 | Nagano Interior Kogyo Kk | Sofa |
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