CN208571954U - A kind of two-way high thrust piezoelectric straight line actuator - Google Patents
A kind of two-way high thrust piezoelectric straight line actuator Download PDFInfo
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- CN208571954U CN208571954U CN201821021292.7U CN201821021292U CN208571954U CN 208571954 U CN208571954 U CN 208571954U CN 201821021292 U CN201821021292 U CN 201821021292U CN 208571954 U CN208571954 U CN 208571954U
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Abstract
The utility model discloses a kind of two-way high thrust piezoelectric straight line actuator, mainly include driving unit, clamp units and output shaft.For the characteristic of piezoelectric element resistance to compression not tension, designed using symmetrical structure, upper and lower two piezoelectric stacks carry driving when pressure load and tensile load respectively, realize high thrust double action as driving source.Clamp element includes that clamp nut, flexible clutch and torque motor, flexible clutch realize different clamps in torque motor torque transfer to clamp nut up and down.Output shaft is trapezoidal screw, and root of the tooth intensity is high, and wearability is good, good to neutrality, and good manufacturability.The utility model is simple and compact for structure, and the piezoelectric stack of symmetrical distribution is cooperated using bidirectional screw clamping institution, the single step output displacement stacked is accumulated and is superimposed, big stroke, high thrust is exported by trapezoidal screw and pushing-pulling bi-directional actuation may be implemented.
Description
Technical field:
The utility model relates to the two-way piezoelectric actuator of high thrust and its working methods, belong to piezoelectric actuator field.
Background technique:
In recent years, with the fast development of piezoelectric material technique and precision processing technology, the research of piezoelectric straight line actuator
There is remarkable progress.Since linear actuator energy directly linear movement output is made pottery without intermediate conversion mechanism and piezoelectricity
Porcelain nanoscale resolution ratio, thus piezoelectric straight line actuator have structure is simple, noise is low, precision is high, be easy to minimize etc. it is excellent
Point.Therefore, piezoelectric straight line actuator is in bioengineering, and mechanical micro-group dress, MEMS (MEMS) and aerospace etc. are numerous
Field is widely applied.
According to the type of driving element, piezoelectric straight line actuator mainly has two kinds of forms of piezoelectric ceramics and piezoelectric stack.Pressure
Electroceramics actuator is a kind of Micro displacement actuator that the inverse piezoelectric effect using piezoelectric material is made, have it is small in size,
The features such as energy density height, high resolution, fast frequency response, has become important positioning and driving element in Precision Position Location System.By
It is smaller in the power output and output displacement of the piezoelectric ceramic actuator based on monolithic piezoelectric ceramic chip, it usually uses centainly
Multi-disc piezoelectric ceramic wafer and electrode are formed by stacking piezoelectric stack actuator to improve power output and displacement by technique.So with pressure
Electroceramics is compared, and piezoelectric stack has many advantages, such as that High power output under non-resonant behavior, deformation is big, position repeatability is good.Piezoelectricity
Actuator is broadly divided into piezoelectric ultrasonic motor, Micro Displacement Piezoelectric Actuator for Cutting, piezoelectric inertia actuator and piezoelectricity looper actuator.
Presently, for existing piezoelectric ultrasonic motor due to the limitation of its principle, power output is smaller, generally within 100N；Piezoelectric micromotor
Actuator configurations are compact, High power output, and dynamic characteristic is good, but its impulse stroke is smaller, and general maximum is in tens micron ranges；
Piezoelectric inertia actuator has the characteristics that high-resolution, big stroke can be achieved, but its power output is smaller.Piezoelectricity looper actuator,
Not only had the advantages that high resolution, stability were good, bearing capacity is strong, High power output, but also sufficiently large displacement may be implemented.It is real
The actuator patent based on piezoelectricity looper principle once was crossed in utility model in 2014 with novel person, application No. is
CN201410676948.9, entitled " high thrust piezoelectric actuator and its working method ", which realizes actuator
High thrust output under pressure load.But by the characteristic of piezoelectric element resistance to compression not tension, which, which cannot achieve, is being drawn
Actuation under power load, and stroke is less than normal.Therefore existing some actuator are difficult meeting high thrust, big stroke while realizing push-and-pull
Double action.
Utility model content:
In view of the above problem, it is based on utility model early period, the utility model proposes one kind to be driven based on piezoelectricity looper
The two-way high thrust piezoelectric straight line actuator of the Novel push-and-pull of principle has structure simple, compact, and assembly precision is high, good manufacturability,
The advantages that high-efficient.
According to the utility model proposes a kind of two-way high thrust piezoelectric straight line actuator, including screw rod, clamp structure, pressure
Electricity stacks and torque motor；Wherein, the torque motor is located at the middle part of actuator, in two lateral edge screw rod sides of torque motor
To clamp structure and piezoelectric stack is successively arranged, the clamp nut is connected on the screw rod；The clamp structure and
Piezoelectric stack two sides above and below torque motor are symmetrical, carry high thrust actuation when pressure and pulling force respectively；The pincers
Bit architecture includes upper and lower two trapezoidal nuts and connected flexible clutch, and it is double that clamp structure is able to achieve actuator
To actuation；The torque motor provides clamp torque.
Further, the clamp structure includes clamp nut and flexible clutch, the clamp nut and piezoelectric stack
And there is certain slight distance in clamp end face, the flexible clutch is connected with clamp nut.
Further, the piezoelectric stack is externally provided with casing, and the end of the casing, which is equipped with, stacks end cap.
Further, it is equipped with clamp end face close to the side of motor in clamp nut in the casing, clamps end face and machine
Shell is integrated.
As a preference, the screw rod uses trapezoidal nut screw, it is that inside and outside trapezoidal thread is passed in transmission
Dynamic, internal and external threads are adjacent to the conical surface to be not easy to loosen.
As a preference, two casings are all in the clamp nut and torque motor main shaft junction and and flexible coupling
Device connecting portion aperture had not only realized that spanner screwed the two, but also observed connection and control spacing as viewing hole.
Further, centre bore is equipped at the piezoelectric stack end cap central, in the centre bore processing rectangular spline with
The rectangular spline at trapezoidal screw both ends cooperates, and prevents lead screw from rotating under torque motor drive.
Further, the screw rod is equipped with grating coding disk, realizes the monitoring to rotational speed of torque motor.
Its driving method, the driving side are also provided based on above-mentioned two-way high thrust piezoelectric straight line actuator the utility model
Under method original state, the clamp nut all with piezoelectric stack end face and respectively clamp end face have slight distance, when actuator by
When to pressure load, lead screw is moved down；Wherein, upper clamp nut, which has, is detached from top piezoelectric stack becoming to clamp end face displacement
Gesture, end face of the lower clamp nut under lead screw drive and on the piezoelectric stack of lower section force together；Applying lower piezoelectric stacks drive simultaneously
Dynamic signal and the positive rotaring signal of torque motor, piezoelectric stack elongation, lower piezoelectric stacks the lower clamp nut of drive and lead screw moves upwards,
Upper clamp nut also with lead screw move upwards far from clamp end face and under the drive of torque motor to clamp the precession of end face direction,
Lower clamp nut is not rotated because of the frictional force of contact surface；When piezoelectric stack is shunk, upper clamp nut has been threaded to clamp end
Face support load, lower clamp nut, which is no longer influenced by load effect and is detached from, stacks end face, generates towards the positive rotation for stacking end face
Turn, until lower piezoelectric stacks the position to restPose, lower clamp nut is threaded to lower piezoelectric and stacks end face, so completes to stack
Pressure forward motion in one drive cycle recycles above-mentioned periodic motion and realizes big stroke actuation.
Further, when actuator under tension loads, for mirror image in pressure load forward motion, upper piezoelectric stack is to drive
Dynamic element, torque motor is inverted status, and upper clamp nut and lower clamp nut exchange function, completion stack a drive cycle
The reverse actuation of interior pulling force recycles above-mentioned periodic motion and realizes big stroke actuation.
Compared with prior art, the utility model has following technical advantage:
1) using two piezoelectric stacks of symmetrical layout, driving force when pressure load and tensile load is provided respectively, with
Realize double action.
2) bidirectional screw clamp is realized since flexible clutch can use a torque motor, to simplify complete machine knot
Structure.
3) since trapezoidal screw nut drive technology is good, transmission efficiency is high, and by rectangular spline and stacks end cap
Connection, improves transmission accuracy.
4) since end face is integrated with casing progresss shapes for clamp, reduce connector and number is installed, therefore is whole
Machine is compact-sized and improves the precision of complete machine.
Detailed description of the invention:
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed in the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of utility model, for those of ordinary skill in the art, without creative efforts, also
Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 is the installation diagram of two-way high thrust piezoelectric straight line actuator under the utility model embodiment；
Fig. 2 is two-way high thrust piezoelectric straight line actuator pressure forward motion timing diagram under the utility model embodiment；
Fig. 3 is that two-way high thrust piezoelectric straight line actuator two clamps nuts with lower piezoelectric up and down under the utility model embodiment
Stack variable condition figure (in nut motion state diagram, 1, which represents nut, is in the state that rotates forward, and 0 represents in halted state)；
Fig. 4 is two-way high thrust piezoelectric straight line actuator pulling force reverse movement timing diagram under the utility model embodiment；
Fig. 5 is that two-way high thrust piezoelectric straight line actuator two clamps nuts with upper piezoelectricity up and down under the utility model embodiment
Stacking variable condition figure, (in nut motion state diagram, -1, which represents nut, is in counter-rotated condition, and 0 represents in stopping shape
State)；
Specific embodiment:
The utility model will be further described below with reference to the accompanying drawings.
Shown in Figure 1, the two-way high thrust piezoelectric actuator of the utility model includes above stacking end cap 1-1, upper piezoelectricity
Stack 2-1, upper clamp nut 3-1, upper casing 4-1, upper flexible clutch 5-1, torque motor 6, grating coding disk 7, trapezoidal silk
Thick stick 8, lower flexible clutch 5-2, lower casing 4-2, lower clamp nut 3-2, lower piezoelectric stack 2-2, under stack end cap 1-2.Wherein,
Torque motor 6 connects clamp nut 3-1 and lower clamp spiral shell by upper flexible clutch 5-1 with lower flexible clutch 5-2 respectively
Female 3-2, collectively constitutes clamp structure；Driving element when upper piezoelectric stack 2-1 is tensile load, lower piezoelectric stack 2-2 as pressure
Driving element when power loads；Trapezoidal screw 8 be output unit by rectangular spline respectively above stack end cap 1-1 and under stack
End cap 1-2 is connected.The two-way high thrust piezoelectric straight line actuator of the utility model is by way of screw-driven by piezoelectric stack
The energy input of small amplitude and high frequency rate is converted to the energy output of low frequency big displacement, and in such a way that spiral clamps, pressure
Electricity stacks generated high thrust and passes, and the direction of rotation for changing different piezoelectric stack driving and torque motor 6 can
Realize the actuation of actuator pushing-pulling bi-directional.
It please refers to Fig. 1 and combines shown in Fig. 2 and Fig. 3, the pressure of the two-way high thrust piezoelectric straight line actuator of the utility model
Load forward motion process it is as follows: original state, upper clamp nut 3-1 and lower clamp nut 3-2 respectively with upper piezoelectric stack 2-
1, lower piezoelectric stacks the end face 2-2 and respectively there is slight distance in clamp end face.Since pressure load acts on, nut screw is to moving down
Dynamic, upper clamp nut 3-1 has the tendency that be detached from top piezoelectric stack is displaced to clamp end face, and lower clamp nut 3-2, which is reached, to be pushed
Electricity stacks the end face 2-2, the i.e. state of t=0.In 0 < t < T/2, i.e., applies the positive rotaring signal of torque motor 6 simultaneously and lower piezoelectric stacks 2-
2 pumping signals.Lower piezoelectric stacks 2-2 and starts to extend under the action of biased sinusoidal voltage, the lower clamp nut 3-2 contacted
Trapezoidal screw 8 is driven to move upwardly together.Upper clamp nut 3-1 is also moved upwards with trapezoidal screw 8 far from clamp end face simultaneously,
But it due to the effect of torque motor 6, will be rotated in the forward direction to clamp end face.During this, pressure load passes through trapezoidal silk
Thick stick 8 acts directly on lower clamp nut 3-2, therefore lower clamp nut 3-2 and lower piezoelectric are stacked and generated between the end face 2-2 very greatly
Frictional force, so as to cause its can not follow torque motor 6 rotate.As t=T/2, i.e., lower piezoelectric stacks 2-2 and extends to most
At big displacement, upper clamp nut 3-1 is just threaded to clamp end face at this time.In T/2 < t < T, i.e., lower piezoelectric stacks 2-2 and starts to receive
Contracting, since upper clamp nut 3-1 cycle clamps end face, load pressure is acted on by upper clamp nut 3-1 on trapezoidal screw 8
On its clamp end face, so that trapezoidal screw 8 does not stack the contraction of 2-2 with lower piezoelectric and moves down.Meanwhile upper clamp nut
Very big frictional force is generated between 3-1 and clamp end face, causes it that torque motor 6 can not be followed to rotate in the forward direction.In the process, under
The sudden contraction that clamp nut 3-2 stacks 2-2 because of lower piezoelectric is separated, descends the torsion stored before flexible clutch 5-2 in addition
Square generates towards lower piezoelectric so that lower clamp nut 3-2 is quickly rotated in the forward direction under the drive of torque motor 6 and stacks the end face 2-2
Axial displacement.As t=T, i.e., lower piezoelectric stacks 2-2 reinstatement state, and lower clamp nut 3-2 cycle stacks end face, actuator
Complete the actuation of a cycle.Such accumulated time completes big stroke output.
It please refers to Fig. 1 and combines shown in Fig. 4 and Fig. 5, the pulling force of the two-way high thrust piezoelectric straight line actuator of the utility model
Load reverse movement process is with the pressure load forward motion main distinction: upper piezoelectric stack 2-1 is driving element and torque
Motor 6 is in reverse rotation state, and upper clamp nut 3-1 is exchanged with lower clamp nut 3-2 function.In one drive cycle, on
Piezoelectric stack 2-1 and torque motor 6, which are mutually matched, completes a tensile load reverse movement, and trapezoidal screw 8 is under tensile load
Complete a bit of upstream shift.It is applied with the periodic signal of piezoelectric stack 2-1 and the reversion letter of torque motor 6 repeatedly
Number, lead screw can be realized persistently retracts load movement.
The foregoing is merely the preferred embodiments of the utility model, are not intended to limit the utility model, for this field
For technical staff, various modifications and changes may be made to the present invention, and all any modifications made to the utility model are equal
Replacement, improvement etc., should be included within the scope of protection of this utility model.
Claims (8)
1. a kind of two-way high thrust piezoelectric straight line actuator, it is characterised in that: the actuator includes screw rod, clamp structure, pressure
Electricity stacks and torque motor；Wherein, the torque motor is located at the middle part of actuator, in two lateral edge screw rod sides of torque motor
To clamp structure and piezoelectric stack is successively arranged, the clamp structure is connected on the screw rod by clamping nut；It is described
Clamp structure and piezoelectric stack two sides above and below torque motor are symmetrical, and upper and lower piezoelectric stack carries pressure and pulling force
High thrust actuation when load；Upper and lower clamp structure respectively includes upper and lower two trapezoidal nuts and connected flexible connection
Axis device, clamp structure make actuator be able to achieve double action；The torque motor provides clamp torque.
2. two-way high thrust piezoelectric straight line actuator as described in claim 1, which is characterized in that the clamp structure includes pincers
There are slight distance, the flexible clutch in position nut and flexible clutch, the clamp nut and piezoelectric stack and clamp end face
It is connected with clamp nut.
3. two-way high thrust piezoelectric straight line actuator as described in claim 1, which is characterized in that the piezoelectric stack is externally provided with
Casing, the end of the casing, which is equipped with, stacks end cap.
4. two-way high thrust piezoelectric straight line actuator as claimed in claim 3, which is characterized in that in clamp spiral shell in the casing
Female side close to motor is equipped with clamp end face, and clamp end face is integrated with casing.
5. such as the described in any item two-way high thrust piezoelectric straight line actuator of Claims 1-4, which is characterized in that the screw rod
It is that inside and outside trapezoidal thread is driven in transmission, internal and external threads are adjacent to the conical surface to be not easy to loosen using trapezoidal nut screw.
6. two-way high thrust piezoelectric straight line actuator as claimed in claim 4, which is characterized in that two casings are all in the pincers
Position nut and torque motor main shaft junction and with flexible clutch connecting portion aperture, both realized that spanner revolved the two
Tightly, and as viewing hole connection and control spacing are observed.
7. two-way high thrust piezoelectric straight line actuator as claimed in claim 5, which is characterized in that in the piezoelectric stack end cap
Centre bore is equipped at the heart, processing rectangular spline and the rectangular spline at trapezoidal screw both ends cooperate in the centre bore, prevent
Lead screw rotates under torque motor drive.
8. two-way high thrust piezoelectric straight line actuator as claimed in claim 5, which is characterized in that the screw rod is equipped with grating
Coding disk realizes the monitoring to rotational speed of torque motor.
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| CN201821021292.7U CN208571954U (en) | 2018-06-29 | 2018-06-29 | A kind of two-way high thrust piezoelectric straight line actuator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112290822A (en) * | 2020-09-14 | 2021-01-29 | 南京航空航天大学 | High-thrust threaded linear ultrasonic motor and working method thereof |
| CN112290824A (en) * | 2020-09-14 | 2021-01-29 | 南京航空航天大学 | Threaded piezoelectric linear actuator with high thrust and working method thereof |
| CN112727689A (en) * | 2020-12-29 | 2021-04-30 | 河北科技大学 | Permanent magnet generator and power generation system |
-
2018
- 2018-06-29 CN CN201821021292.7U patent/CN208571954U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112290822A (en) * | 2020-09-14 | 2021-01-29 | 南京航空航天大学 | High-thrust threaded linear ultrasonic motor and working method thereof |
| CN112290824A (en) * | 2020-09-14 | 2021-01-29 | 南京航空航天大学 | Threaded piezoelectric linear actuator with high thrust and working method thereof |
| CN112727689A (en) * | 2020-12-29 | 2021-04-30 | 河北科技大学 | Permanent magnet generator and power generation system |
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