CN209504114U - A kind of passive flexible constant force mechanisms of high off-axis rigidity - Google Patents
A kind of passive flexible constant force mechanisms of high off-axis rigidity Download PDFInfo
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- CN209504114U CN209504114U CN201920022350.6U CN201920022350U CN209504114U CN 209504114 U CN209504114 U CN 209504114U CN 201920022350 U CN201920022350 U CN 201920022350U CN 209504114 U CN209504114 U CN 209504114U
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Abstract
The utility model relates to a kind of passive flexible constant force mechanisms of high off-axis rigidity, including chassis, the central seat being fixed on chassis, the stress seat above central seat, the first flexible unit, the second flexible unit；First flexible unit includes the first flexible thin beam, the second flexible thin beam, connection frame；Second flexible unit includes third flexibility thin beam；One end of first flexible thin beam is connect with stress seat, the other end of first flexible thin beam is connect with connection frame, one end of second flexible thin beam is connect with central seat, the other end of second flexible thin beam is connect with connection frame, one end of third flexibility thin beam is connect with stress seat, and the other end of third flexibility thin beam is connect with chassis.The off-axis good rigidity of passive flexibility constant force mechanisms, output response speed is fast, and mechanism kinematic is not influenced by factors such as friction of motion, hysterisis errors, to there is preferable output accuracy, it can be widely used for all kinds of contact operations of robot, improve the interactivity between machine human and environment.
Description
Technical field
The utility model relates to a kind of passive flexible constant force mechanisms more particularly to a kind of passive flexible perseverances of high off-axis rigidity
Force mechanisms.
Background technique
In motion planning and robot control at this stage, it can often encounter the job task interacted with circumstances not known, i.e. contact operation,
This kind of movement needs robot controls output position and power output simultaneously, to provide good environmental interaction, contacts operation
It common are the tasks such as polishing, polishing, miniature operation.If simple only control robot motion position, often because
Lead to the mutation of power for the mutation of position, to damage to machine human and environment, interactivity is poor.Constant force mechanisms generally refer to
The mechanism for the reaction force approximately constant that its output end generates within the scope of certain input motion.Active constant force mechanisms and passive perseverance
Force mechanisms are common two class constant force mechanisms at present, and wherein active constant force mechanisms are due to needing to use accurate sensor and multiple
Miscellaneous control algolithm is to improve the response speed and precision of process control, to need complicated operation and design cost.Passively
Constant force mechanisms are subdivided into passive compliant mechanism and passive rigid mechanism.Wherein, passive rigid constant force mechanisms are by using
Spring not in full conformity with Hooke's law, and often there is the problems such as frictional force, abrasion, assembly complicated in such mechanism, cause most
Whole output accuracy is lower.
Utility model content
For the technical problems in the prior art, the purpose of this utility model is: providing a kind of high off-axis rigidity
Passive flexibility constant force mechanisms, the passive flexible constant force mechanisms structure is simple, when the input displacement of input terminal to a certain extent when,
Mechanism remains to provide the reaction force of approximately constant output.
In order to achieve the above object, the utility model adopts the following technical solution:
A kind of passive flexible constant force mechanisms of high off-axis rigidity, including chassis, the central seat being fixed on chassis, are located at
Stress seat, the first flexible unit, the second flexible unit above central seat；First flexible unit include the first flexible thin beam,
Second flexible thin beam, connection frame；Second flexible unit includes third flexibility thin beam；One end of first flexible thin beam and stress seat connect
It connects, the other end of the first flexible thin beam is connect with connection frame, and one end of the second flexible thin beam is connect with central seat, and second is flexible
The other end of thin beam is connect with connection frame, and one end of third flexibility thin beam is connect with stress seat, the other end of third flexibility thin beam
It is connect with chassis, when stress seat is by a certain range of power, the first flexible unit, the second flexible unit can provide constant anti-
Active force.
Further, the first flexible unit, the second flexible unit have several, if several first flexible units and
Dry the second flexible unit is distributed by center circle alternate of stress seat, the quantity of the first flexible unit, the second flexible unit
It is in a linear relationship with the output constant force value of passive flexible constant force mechanisms.
Further, stress seat is in eight prism-shapeds, the first flexible unit and the second flexible unit it is equal there are four, four the
The flexible thin beam of the first of one flexible unit is separately fixed at stress seat wherein four mutual non-conterminous sides, four second flexible groups
The third flexibility thin beam of part is separately fixed at stress seat four additional mutually non-conterminous side.
Further, the flexible thin beam of the first of each first flexible unit and the second flexible thin beam have two, each
The third flexibility thin beam of second flexible unit has one, so that passive flexibility constant force mechanisms are able to bear bigger active force,
More stable reaction force is provided.
Further, wherein four mutual non-conterminous sides are equipped with square groove, stress seat four additional to stress seat
Mutual non-conterminous side is equipped with the first wishbone, the two first flexible thin beam sides of being separately fixed at of each first flexible unit
The upper surface and lower end surface of connected in star, third flexibility thin beam are fixed on the first wishbone, and square groove is for fixing the first flexibility
Thin beam, the first wishbone is for fixing third flexibility thin beam.
Further, connection frame includes connecting plate；Connecting plate be successively arranged from top to bottom first boss, second boss,
Third boss, the 4th boss, it is convex that two first of each first flexible unit flexible thin beams by bolt are separately fixed at first
On platform and second boss, two second of each first flexible unit flexible thin beams by bolt be separately fixed at third boss with
On 4th boss.Connecting plate is for fixing the first flexible thin beam and the second flexible thin beam.
Further, central seat is in cross, four end faces of central seat are solid with two second flexible thin beams
Fixed connection, central seat is for fixing the second flexible thin beam.
Further, chassis includes bottom plate, the tripod being fixed on bottom plate, the side plate being fixed on tripod；Side
Plate is equipped with the second wishbone, and one end of the second wishbone is fixed on side plate, the other end and third flexibility thin beam of the second wishbone
One end be fixedly connected.
Further, tripod is in triangular prism shape, the one of side of tripod is equipped with triangular prism groove, tripod
In addition two sides (passing through bolt) are fixedly connected with chassis and bottom plate respectively, and bottom plate is in cross, and tripod and side plate are equal
There are four, four side plates are separately fixed at four ends of bottom plate by four tripods.
Further, the first flexible thin beam, the second flexible thin beam, third flexibility thin beam are polypropylene, stress seat exists
In a certain range when voltuntary movement, the deformation of the first flexible thin beam, the second flexible thin beam, third flexibility thin beam is elastic change
Shape, therefore, the first flexible thin beam, the second flexible thin beam, third flexibility thin beam will constantly compress and is rebounded reply this two
It is jumped in kind state, the first flexible thin beam, the second flexible thin beam, third flexibility thin beam storage energy in this section of motion process,
Realize the storage and release of energy, and the storage and release of energy are approximately equal during this, to realize that constant force exports.
Generally speaking, the utility model has the advantages that
The passive flexible constant force mechanisms of the off-axis rigidity of this height, when stress seat by perpendicular to stress seat upper surface (from stress
Seat is directed toward bottom plate) input displacement when, the first flexible thin beam, the second flexible thin beam, the equal stress of third flexibility thin beam are bent
It deforms (flexible deformation), and generates corresponding reaction force.In a certain range, the first flexible thin beam, the second flexible thin beam,
The power summation size for the reaction force that third flexibility thin beam generates is approximately constant.Mechanism movement avoids the one of traditional mechanism
A little disadvantages.Such as it is very close to each other in the assembly of the utility model mechanism, therefore movement is not influenced by factors such as hysterisis errors；Separately
Outside, there is no traditional kinematic pair in mechanism, therefore not by friction effects and without abrasion in motion process.These characteristics make machine
The power output of structure has higher precision.Meanwhile there is preferable anti-interference ability in mechanism, due to considering entirety when mechanism design
The off-axis rigidity of mechanism, therefore when interference of mechanism during unidirectional motion by other directions, still it is able to maintain approximate perseverance
The output of power.Because mechanism production is simple and cost is relatively low, rigid element can be processed by common plastic part, and compliant member can be by
The production such as sheet metal, organic plastics thin plate, therefore mechanism lighter weight.The movement of mechanism is equal to the deformation of flexible thin beam
Movement, therefore the noise generated in motion process almost noiseless generation.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of passive flexible constant force mechanisms.
Fig. 2 is the top view of passive flexible constant force mechanisms.
Fig. 3 is the structural schematic diagram of the first flexible unit.
Fig. 4 is the structural schematic diagram of the second flexible unit.
Fig. 5 is the structural schematic diagram of stress seat.
Fig. 6 is the structural schematic diagram of central seat.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in more detail.
It is now attached to what is occurred in Figure of description for the ease of uniformly checking each appended drawing reference inside Figure of description
Icon note is unitedly described as follows:
1 is chassis, and 2 be center pedestal, and 3 be stress seat, and 4 be the first flexible unit, and 5 be the second flexible unit, and 6 be first
Flexible thin beam, 7 be the second flexible thin beam, and 8 be connection frame, and 9 be third flexibility thin beam, and 10 be square groove, and 11 be the first V-arrangement
Frame, 12 be first boss, and 13 be second boss, and 14 be third boss, and 15 be the 4th boss, and 16 be bottom plate, and 17 be tripod, 18
It is the second wishbone for side plate, 19.
In conjunction with shown in Fig. 1, Fig. 2, Fig. 3, a kind of passive flexible constant force mechanisms of high off-axis rigidity, including chassis, be fixed on
Central seat on chassis, the stress seat above central seat, the first flexible unit, the second flexible unit；First is flexible
Component includes the first flexible thin beam, the second flexible thin beam, connection frame；Second flexible unit includes third flexibility thin beam；This is passive
There was only the first flexible thin beam, the second flexible thin beam, third flexibility thin beam in mechanism is compliant member, and flexible deformation can occur,
Other components are rigid element.One end of first flexible thin beam is fixedly connected with stress seat, the first flexibility thin beam it is another
One end is fixedly connected with connection frame, and one end of the second flexible thin beam is fixedly connected with central seat, the second flexibility thin beam it is another
End be fixedly connected with connection frame, one end of third flexibility thin beam is fixedly connected with stress seat, the other end of third flexibility thin beam and
Chassis is fixedly connected.First flexible thin beam, the second flexible thin beam are horizontally disposed, and third flexibility thin beam is obliquely installed, and connection frame is outstanding
Sky, connection frame moves freely when the first flexible thin beam, the second flexible thin beam deform, third flexibility thin beam and stress seat
One end of connection is higher than one end for connecting with chassis of third flexibility thin beam, and one end that third flexibility thin beam is connect with stress seat can be with
It moves freely, one end that third flexibility thin beam is connect with chassis is fixed.Stress seat and central seat are located at same vertical line
It goes up and between stress seat and central seat there are certain space, central seat is fixed on the center on chassis.
First flexible unit, the second flexible unit have several, several first flexible units and several are second soft
Property component be distributed using stress seat as center circle alternate, the first flexible unit, the number of the second flexible unit are consistent and first
Flexible unit, the second flexible unit are arranged between two adjacent the first flexible units using stress seat as center circle distribution
There is second flexible unit (or being provided with first flexible unit between two adjacent the second flexible units).
First flexible thin beam, the second flexible thin beam, third flexibility thin beam are prepared by flexible thin, according to flexible thin
The physical size and mounting means of the mechanical characteristic adjustment thin plate of beam, make the output group of the first flexible unit and the second flexible unit
Resultant force is approximately constant, and flexible deformation, the first flexible thin beam, the second flexible thin in the present embodiment can occur for flexible thin beam
Beam, third flexibility thin beam are polypropylene material.
In conjunction with shown in Fig. 1, Fig. 5, stress seat be in eight prism-shapeds, the first flexible unit and the second flexible unit it is equal there are four,
The flexible thin beam of the first of four the first flexible units is separately fixed at stress seat wherein four mutual non-conterminous sides, and four second
The third flexibility thin beam of flexible unit is separately fixed at stress seat four additional mutually non-conterminous side.Eight prisms have eight sides
Face, wherein four mutual non-conterminous sides are respectively fixed with the first flexible thin beam, mutually non-conterminous side is fixed with four additional
Third flexibility thin beam.Angle between two adjacent the first flexible units is 90 °, between two adjacent the second flexible units
Angle be 90 °, the angle between adjacent first flexible unit and the second flexible unit is 45 °.
Preferably, the first of each first flexible unit the flexible thin beam and the second flexible thin beam have two, and each second
The third flexibility thin beam of flexible unit has one.Eight prisms have eight sides, wherein all distinguishing on four mutual non-conterminous sides
There are two first flexible thin beams, mutually non-conterminous side is fixed with a third flexibility thin beam to four additional.
Wherein four mutual non-conterminous sides are equipped with square groove to stress seat, the mutual non-conterminous side of stress seat four additional
Face is equipped with the first wishbone, and the flexible thin beam of two first of each first flexible unit is separately fixed at the upper end of square groove
Face and lower end surface, third flexibility thin beam are fixed on the first wishbone.One end of the flexible thin beam of two first of each flexible unit
The upper surface and lower end surface of square groove are separately fixed at by bolt, the flexible thin beam of two first of each flexible unit is mutual
It is parallel and be located at same vertical line on.First wishbone is bolted on stress seat four additional mutually non-conterminous side
On, one end of third flexibility thin beam is bolted on the first wishbone, and one end other end of third flexibility thin beam passes through spiral shell
Bolt is fixed on the second wishbone.
In conjunction with shown in Fig. 1, Fig. 3, Fig. 6, connection frame includes connecting plate；Connecting plate be successively arranged from top to bottom first boss,
Second boss, third boss, the 4th boss, connecting plate, first boss, second boss, third boss, the 4th boss one at
Type.One end of two first of each flexible unit flexible thin beams pass through bolt be separately fixed at square groove upper surface and
Lower end surface, the other ends of two first of each first flexible unit flexible thin beams by bolt be separately fixed at first boss with
In second boss.One end of the flexible thin beam of two second of each first flexible unit is separately fixed at third boss by bolt
On the 4th boss, the other end of the flexible thin beam of two second of each first flexible unit is bolted on central seat
On.
Central seat is in cross, and four end faces of central seat are bolted company with two second flexible thin beams
It connects.
In conjunction with shown in Fig. 1, Fig. 4, chassis includes bottom plate, the tripod being fixed on bottom plate, the side being fixed on tripod
Plate；(upper end) is equipped with the second wishbone on side plate, and one end of the second wishbone is bolted on side plate, the second wishbone
The other end and one end of third flexibility thin beam are bolted to connection.
Tripod is in triangular prism shape, and the one of side of tripod is equipped with triangular prism groove, other two of tripod
Side is fixedly connected with chassis and bottom plate respectively, and tripod and triangular prism groove are right-angle prismatic column.There are two sides for tripod
Face is orthogonal, and one in mutually perpendicular two sides is bolted on bottom plate, and side plate is bolted on
On another side of tripod.Bottom plate is in cross, tripod and side plate it is equal there are four, four side plates pass through four tripods point
It is not fixed on four ends of bottom plate.Central seat is fixed on the center of bottom plate, and four side plates are opposite two-by-two, and two adjacent side plates are mutual
It is perpendicular.
When inputting certain displacement to stress seat, due to the first flexible thin beam, the second flexible thin beam, third flexibility thin beam hair
Raw deflection deformation is flexible deformation, thus stress seat in a certain range voltuntary movement when, it is the first flexible thin beam, second flexible
Thin beam, third flexibility thin beam will constantly compressed and rebound reply both states in jump.First flexible thin beam, second
Flexible thin beam, third flexibility the thin beam storage energy in this section of motion process, realize the storage and release of energy, and this process
The storage and release of middle energy are approximately equal, to realize that constant force exports.It is most of to use spring compared to existing constant force mechanisms
Component is a kind of rigid constant force mechanisms, such as existing constant hanger and automatic carrier, is all to realize constant force using spring
Output, mechanism are a kind of flexible constant force mechanisms, it is defeated to be capable of providing more accurate and stable constant force using a kind of flexible thin beam
Out.
Off-axis rigidity comes from: mechanical engineering forward position works Series machine people's science and technology book series: " compliant mechanism design
Theoretical and example ", translation: Chen Guimin, Yu Jingjun, Ma Hongbo, publishing house: Higher Education Publishing House, publication time: 2015-03-
01。
It is other in addition to the first flexible thin beam, the second flexible thin beam, third flexibility thin beam can deform in mechanism
Rod piece is all rigid element, and off-axis rigidity refers in the kinematics analysis of regid mechanism, usually assumes that all rod piece rigidity
Infinity, mechanism kinematic all occur at hinge.For compliant mechanism, movement is become under load effect by flexible member
Shape is to obtain desired behavior, and any local deformation is all to be lower than other component or same due to the rigidity of deformation unit
One deformation unit is lower than other directions along the rigidity of a direction.By off-axis rigidity than being defined as the rigidity along unexpected kinematic axis
With the ratio between the rigidity along desired motion axis.If off-axis rigidity is than high, the localization highly significant of deformation；On the contrary, if off-axis
Rigidity is than low, it means that flexible unit is easy to deform to the unexpected direction of motion under load effect.The ideal of mechanism
Impact direction or the direction of motion be perpendicular to stress seat negative direction (from stress seat be directed toward bottom plate), but in a certain range this
The direction of a power or movement can have certain deviation perpendicular to stress seat negative direction (being directed toward bottom plate from stress seat), also can
The reaction force of one constant force is provided.
The working principle of the passive flexible constant force mechanisms of the off-axis rigidity of this height: bottom plate is fixed on fixing end, stress seat and outer
The connection of boundary's input terminal, power or movement of the extraneous input terminal input perpendicular to stress seat negative direction (being directed toward bottom plate from stress seat)
When.Since the power inputted or movement can squeeze the first flexible thin beam, the second flexible thin beam, third flexibility thin beam,
Therefore the first flexible thin beam, the second flexible thin beam, third flexibility thin beam will generate perpendicular to stress seat positive direction stress seat
The reaction force F of (being directed toward stress seat from bottom plate).In certain motion range, reaction force F will keep approximately constant.
Above-described embodiment is the preferable embodiment of the utility model, but the embodiments of the present invention is not by above-mentioned
The limitation of embodiment, it is made under other any spiritual essence and principles without departing from the utility model to change, modify, replacing
In generation, simplifies combination, should be equivalent substitute mode, is included within the protection scope of the utility model.
Claims (10)
1. a kind of passive flexible constant force mechanisms of high off-axis rigidity, it is characterised in that: including chassis, the center being fixed on chassis
Pedestal, the stress seat above central seat, the first flexible unit, the second flexible unit；First flexible unit includes first
Flexible thin beam, the second flexible thin beam, connection frame；Second flexible unit includes third flexibility thin beam；One end of first flexible thin beam
It is connect with stress seat, the other end of the first flexible thin beam is connect with connection frame, and one end of the second flexible thin beam and central seat connect
It connects, the other end of the second flexible thin beam is connect with connection frame, and one end of third flexibility thin beam is connect with stress seat, third flexible thin
The other end of beam is connect with chassis.
2. a kind of passive flexible constant force mechanisms of high off-axis rigidity described in accordance with the claim 1, it is characterised in that: first is flexible
Component, the second flexible unit have several, several first flexible units and several second flexible units are with stress seat
For the distribution of center circle alternate.
3. the passive flexible constant force mechanisms of a kind of high off-axis rigidity according to claim 2, it is characterised in that: stress seat is in
Eight prism-shapeds, the first flexible unit and the second flexible unit it is equal there are four, the flexible thin beam point of the first of four the first flexible units
Not being fixed on stress seat, wherein four mutual non-conterminous sides, the third flexibility thin beam of four the second flexible units are separately fixed at
The mutual non-conterminous side of stress seat four additional.
4. a kind of passive flexible constant force mechanisms of high off-axis rigidity described in accordance with the claim 3, it is characterised in that: each first
The flexible thin beam of the first of flexible unit and the second flexible thin beam have two, and the third flexibility thin beam of each second flexible unit has
One.
5. the passive flexible constant force mechanisms of a kind of high off-axis rigidity according to claim 4, it is characterised in that: stress seat its
In four mutual non-conterminous sides be equipped with square groove, mutually non-conterminous side is equipped with the first V-arrangement to stress seat four additional
Frame, the flexible thin beam of two first of each first flexible unit are separately fixed at the upper surface and lower end surface of square groove, third
Flexible thin beam is fixed on the first wishbone.
6. the passive flexible constant force mechanisms of a kind of high off-axis rigidity according to claim 5, it is characterised in that: connection frame packet
Include connecting plate；Connecting plate is successively arranged first boss, second boss, third boss, the 4th boss from top to bottom, and each first is soft
Property two first of component flexible thin beams be separately fixed in first boss and second boss by bolt, each first flexibility group
The flexible thin beam of two article second of part is separately fixed on third boss and the 4th boss by bolt.
7. the passive flexible constant force mechanisms of a kind of high off-axis rigidity according to claim 6, it is characterised in that: central seat
In cross, four end faces of central seat are fixedly connected with two second flexible thin beams.
8. a kind of passive flexible constant force mechanisms of high off-axis rigidity described in accordance with the claim 1, it is characterised in that: chassis includes
Bottom plate, the tripod being fixed on bottom plate, the side plate being fixed on tripod；Side plate is equipped with the second wishbone, the second wishbone
One end be fixed on side plate, the other end of the second wishbone is fixedly connected with one end of third flexibility thin beam.
9. the passive flexible constant force mechanisms of a kind of high off-axis rigidity according to claim 8, it is characterised in that: tripod is in
Triangular prism shape, the one of side of tripod are equipped with triangular prism groove, two other sides of tripod respectively with chassis and
Bottom plate is fixedly connected, and bottom plate is in cross, tripod and side plate it is equal there are four, four side plates are fixed respectively by four tripods
At four ends of bottom plate.
10. a kind of passive flexible constant force mechanisms of high off-axis rigidity described in accordance with the claim 1, it is characterised in that: first is soft
Property thin beam, the second flexible thin beam, third flexibility thin beam be acrylic sheet.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920022350.6U CN209504114U (en) | 2019-01-08 | 2019-01-08 | A kind of passive flexible constant force mechanisms of high off-axis rigidity |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920022350.6U CN209504114U (en) | 2019-01-08 | 2019-01-08 | A kind of passive flexible constant force mechanisms of high off-axis rigidity |
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| CN209504114U true CN209504114U (en) | 2019-10-18 |
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