CN209930167U - Double-shaft parallel output type piezoelectric actuator - Google Patents
Double-shaft parallel output type piezoelectric actuator Download PDFInfo
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- CN209930167U CN209930167U CN201920566384.1U CN201920566384U CN209930167U CN 209930167 U CN209930167 U CN 209930167U CN 201920566384 U CN201920566384 U CN 201920566384U CN 209930167 U CN209930167 U CN 209930167U
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Abstract
The utility model discloses a parallelly connected output type piezoelectric actuator of biax contains first rotor subassembly, second rotor subassembly, stator module, pretightning force and applies subassembly and support. The utility model discloses a torsional spring device carries out exerting of pretightning force between motor stator, rotor, has overcome the difficult problem of coordination of current clamping device centre gripping rigidity and elastic support function. The piezoelectric ceramic plate does longitudinal vibration or bending vibration under the excitation of a single-phase excitation signal with a certain frequency, the longitudinal vibration or the bending vibration is converted into rotation in opposite directions by utilizing friction force, the rotary motion in two directions is realized by one driving device, and the piezoelectric ceramic plate has double output capacity, and has the advantages of simple structure, convenience in driving, easiness in miniaturization and the like.
Description
Technical Field
The utility model relates to an supersound motor field especially relates to a parallelly connected output type piezoelectric actuator of biax.
Background
The double-propeller drive is a drive form commonly adopted by the underwater robot, and compared with the single-propeller drive, the double-propeller drive has the advantages of large output thrust and higher drive efficiency, and can autonomously realize the steering function of the underwater robot, so that the double-propeller drive is widely applied to the design of the underwater robot. However, the underwater robot driven by two propellers often faces some problems in the miniaturization process, because the drivers are usually installed on two sides of the robot main body, under the condition of being driven by one motor, two pairs of transmission mechanisms are needed to drive the left and right propellers to rotate respectively, or the two motors are used to drive the left and right propellers to rotate respectively and independently, and the additional transmission mechanisms or the mode of adopting a plurality of motors can increase the complexity of the mechanisms and the volume of the underwater robot main body, further influence the reliability and the safety of the underwater robot, and limit the application environment of the underwater robot. Aiming at centimeter-level micro underwater robots, the technical scheme of two pairs of transmission mechanisms or two motors is not beneficial to the miniaturization of the underwater robot driven by double propellers.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that to the defect that involves in the background art, provide a parallelly connected output type piezoelectric actuator of biax, can be in during operation in media such as water, the higher torque of two pivot simultaneous outputs turns to on the contrary and can directly be used as the power supply of miniature underwater robot or other devices.
The utility model discloses a solve above-mentioned technical problem and adopt following technical scheme:
a double-shaft parallel output type piezoelectric actuator comprises a first rotor assembly, a second rotor assembly, a stator assembly, a pretightening force applying assembly and a support;
the bracket comprises a base, a first mounting plate and a second mounting plate, wherein the first mounting plate and the second mounting plate are vertically arranged on the base and are parallel to each other; the first mounting plate and the second mounting plate are provided with a first mounting hole and a second mounting hole; a vertical sliding groove is formed in the first mounting plate, and a sliding block is arranged in the sliding groove;
the first rotor assembly and the second rotor assembly respectively comprise a rotating shaft, a gear and a driving disc; one end of the rotating shaft is fixedly connected with the rotating shaft of the gear, the other end of the rotating shaft is vertically and fixedly connected with the center of the driving disc, and the plane where the gear is located is parallel to the plane where the driving disc is located;
a rotating shaft of the first rotor assembly penetrates through first mounting holes of the first mounting plate and the second mounting plate respectively and is connected with the first mounting plate and the second mounting plate through bearings; a rotating shaft of the second rotor assembly penetrates through second mounting holes of the first mounting plate and the second mounting plate respectively and is connected with the first mounting plate and the second mounting plate through bearings; the rotating shaft of the first rotor assembly is parallel to the rotating shaft of the second rotor assembly, and the gear of the first rotor assembly is meshed with the gear of the second rotor assembly;
the stator component comprises a metal matrix, a piezoelectric ceramic piece, a base, a first clamping end and a second clamping end; the first clamping end and the second clamping end are arranged on the base, are in a [ -shape and comprise a vertical edge and two parallel transverse edges, and the openings of the first clamping end and the second clamping end are opposite; the metal substrate is a rhombic thin sheet, two ends of the metal substrate are provided with driving feet, and two sides of the metal substrate are fixed at openings of the first clamping end and the second clamping end respectively in an interference fit manner; the piezoelectric ceramic piece is circular, is arranged at the center of the upper surface of the metal substrate, and the polarization direction of the piezoelectric ceramic piece points to the lower surface from the upper surface, and is used for driving the metal substrate to do longitudinal vibration or bending vibration or coupling vibration of the longitudinal vibration and the bending vibration under the excitation of an external single-phase excitation signal;
the pre-tightening force applying assembly comprises a supporting piece, a first torsion spring, a second torsion spring, a fixing piece, a first connecting rod, a second connecting rod and a locking bolt;
the supporting piece is a hollow truncated cone with a closed upper end and an open lower end, and comprises a top plate and first to fourth side plates; the first side plate is fixedly connected with the sliding block on the first mounting plate, so that the supporting piece can freely slide up and down along the sliding groove on the first mounting plate; the top plate, the second side plate and the fourth side plate are vertically and fixedly connected with the first side plate; an included angle between the third side plate and the top plate is an obtuse angle; the first side plate is provided with a threaded hole matched with the locking bolt, and the locking bolt is in threaded connection with the threaded hole in the first side plate and penetrates through the first side plate to abut against the first mounting plate; a notch for the pretightening force applying assembly to pass through is formed in the second mounting plate;
the fixing piece is U-shaped; the third side plate is provided with a U-shaped groove matched with the fixing piece, and the fixing piece is fixed in the groove of the third side plate and fixedly connected with the third side plate;
two ends of the fixing piece are fixedly connected with one ends of the first torsion spring and the second torsion spring respectively; the other ends of the first torsion spring and the second torsion spring are fixedly connected with the other ends of the first connecting rod and the second connecting rod respectively;
the base is respectively provided with mounting holes matched with the first connecting rod and the second connecting rod, and the other ends of the first connecting rod and the second connecting rod are fixedly connected with the base through interference fit, so that driving feet at two ends of the metal base body are respectively abutted against the side walls of the driving discs of the first rotor assembly and the second rotor assembly, and the metal base body drives the driving discs of the first rotor assembly and the second rotor assembly to rotate when vibrating; the pretightening force applying assembly is used for adjusting the pressure between the driving feet at two ends of the metal substrate and the side walls of the driving discs of the first rotor assembly and the second rotor assembly.
As the utility model relates to a further optimization scheme of parallelly connected output type piezoelectric actuator of biax, the drive disc adopts phosphor bronze or stainless steel to make.
As a further optimization scheme of the double-shaft parallel output type piezoelectric actuator, the driving disc is made of carbon fiber, PPS, ceramic or polytetrafluoroethylene.
As the utility model relates to a further optimization scheme of parallelly connected output type piezoelectric actuator of biax, metal base's thickness is 2 mm.
As the utility model relates to a further optimization scheme of parallelly connected output type piezoelectric actuator of biax, the thickness of piezoceramics piece is 1 mm.
As the utility model relates to a further optimization scheme of parallelly connected output type piezoelectric actuator of biax, the sufficient upper surface of drive at metal substrate both ends has the oblique angle to be chamfered, the oblique angle becomes 45 with the horizontal plane, and length is 0.5 mm.
As the utility model relates to a further optimization scheme of parallelly connected output type piezoelectric actuator of biax, the sufficient fixed surface of drive at metal substrate both ends has friction material, friction material adopts aluminium oxide.
The utility model also discloses a drive method of this biax output type piezoelectric actuator that connects in parallel contains following step:
the piezoelectric ceramic piece is connected to a single-phase excitation signal under a preset frequency threshold, and generates ultrasonic vibration according to an inverse piezoelectric effect, so that a metal substrate fixedly connected with the piezoelectric ceramic piece is driven to generate longitudinal vibration or bending vibration or coupling vibration of the longitudinal vibration and the bending vibration, and the coupling vibration is transmitted to the driving foot to show the coupling of microscopic up-and-down vibration, left-and-right vibration or two kinds of vibration, so that the driving disk is driven to rotate by using the friction force between the driving foot and the driving disk, and the rotating shaft fixedly connected with the driving disk is driven to rotate.
As a further preferable aspect of the driving method of the biaxial parallel output type piezoelectric actuator, the single-phase excitation signal is any one of a sine wave, a triangular wave, and a square wave.
The utility model adopts the above technical scheme to compare with prior art, have following technological effect:
the utility model discloses a torsional spring device carries out exerting of pretightning force between motor stator, rotor, has overcome the difficult problem of coordination of current clamping device centre gripping rigidity and elastic support function. The piezoelectric ceramic plate does longitudinal vibration or bending vibration under the excitation of a single-phase excitation signal with a certain frequency, the longitudinal vibration or the bending vibration is converted into rotation in opposite directions by utilizing friction force, the rotary motion in two directions is realized by one driving device, and the piezoelectric ceramic plate has double output capacity, compact structure and can meet the requirement of miniaturization.
Drawings
Fig. 1 (a) and 1 (b) are a schematic three-dimensional structure and a front view, respectively, of the present invention;
fig. 2 is a schematic structural diagram of the middle bracket, the first rotor assembly and the second rotor assembly of the present invention;
FIG. 3 is a schematic view of the structure of the pre-tightening force applying assembly and the stator assembly of the present invention;
FIG. 4 is a schematic three-dimensional structure of the metal substrate of the present invention;
fig. 5 (a) and 5 (b) are schematic diagrams of the working modes of the second-order bending vibration and the first-order longitudinal vibration of the metal substrate according to the present invention, respectively;
fig. 6 (a) and 6 (b) are schematic diagrams illustrating the counterclockwise and clockwise rotation of the first rotor assembly according to the present invention, respectively;
fig. 7 (a) and 7 (b) are a schematic view of polarization mode and a schematic view of signal access of the middle piezoelectric ceramic plate according to the present invention, respectively.
The device comprises a first mounting plate 1, a second mounting plate 2, a base 3, a first mounting hole on the first mounting plate 4, a first mounting hole on the second mounting plate 5, a rotating shaft 6, a driving disc 7, a gear of a second rotor assembly 8, a second mounting hole on the second mounting plate 9, a fixing gasket 10, a fixing piece 11, a third side plate 12, a fourth side plate 13, a first side plate 14, a top plate 15, a second side plate 16, a second clamping end 17, a base 18, a first clamping end 19, a first connecting rod 20 and a fixing bolt 21.
Detailed Description
The technical scheme of the utility model is further explained in detail with the attached drawings as follows:
the present invention may 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, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.
As shown in fig. 1 (a) and fig. 1 (b), the utility model discloses a double-shaft parallel output type piezoelectric actuator, which comprises a first rotor assembly, a second rotor assembly, a stator assembly, a pretightening force applying assembly and a support. Through the pretightening force applying assembly, the stator assembly generates pretightening force for the first rotor assembly and the second rotor assembly to provide friction force required by driving. The piezoelectric ceramic piece in the stator component generates ultrasonic vibration under the excitation of a single-phase signal with a certain frequency to cause the metal matrix to do longitudinal vibration or bending vibration or the coupled vibration of the longitudinal vibration and the bending vibration, and then the rotors at two ends are driven to rotate reversely by using friction force.
As shown in fig. 2, the bracket includes a base, a first mounting plate and a second mounting plate, both of which are vertically disposed on the base, and the first mounting plate and the second mounting plate are parallel to each other; the first mounting plate and the second mounting plate are provided with a first mounting hole and a second mounting hole; the first mounting plate is provided with a vertical sliding groove, and a sliding block is arranged in the sliding groove.
The first rotor assembly and the second rotor assembly respectively comprise a rotating shaft, a gear and a driving disc; one end of the rotating shaft is fixedly connected with the rotating shaft of the gear, the other end of the rotating shaft is vertically and fixedly connected with the center of the driving disc, and the plane where the gear is located is parallel to the plane where the driving disc is located; the driving disc is made of wear-resistant metal materials such as phosphor bronze and stainless steel or non-metal materials with low surface friction coefficient such as carbon fiber, PPS, ceramic and polytetrafluoroethylene, and the output performance of the motor can be effectively improved.
A rotating shaft of the first rotor assembly penetrates through first mounting holes of the first mounting plate and the second mounting plate respectively and is connected with the first mounting plate and the second mounting plate through bearings; a rotating shaft of the second rotor assembly penetrates through second mounting holes of the first mounting plate and the second mounting plate respectively and is connected with the first mounting plate and the second mounting plate through bearings; the rotational axis of the first rotor assembly and the rotational axis of the second rotor assembly are parallel and the gears of the first rotor assembly and the gears of the second rotor assembly mesh as shown in fig. 2.
The stator component comprises a metal matrix, a piezoelectric ceramic piece, a base, a first clamping end and a second clamping end; first exposed core, second exposed core all set up on the base, be "[" type, contain a vertically perpendicular limit and two parallel horizontal limits, and the opening of first exposed core, second exposed core is in opposite directions. The metal matrix is a diamond-shaped sheet with the thickness of 2mm, and two ends of the metal matrix are provided with driving feet; the upper surface of the driving foot is chamfered with an oblique angle which forms 45 degrees with the horizontal plane, and the length is 0.5mm, as shown in figure 4, the contact area between the stator and the rotor is favorably increased, the friction force between the stator and the rotor and the output torque of the rotor are improved, and the output performance of the motor is improved. In addition, in order to slow down the abrasion of the driving feet and the driving disc of the metal matrix, prevent the occurrence of the phenomenon of rotor jamming caused by the falling of dust on the contact surfaces of the stator and the rotor, promote the rotating stability of the rotor and enhance the output effect of the motor, and friction materials such as aluminum oxide are fixed on the surfaces of the driving feet at the two ends. The piezoelectric ceramic plate is circular, the thickness of the piezoelectric ceramic plate is 1mm, the piezoelectric ceramic plate is adhered to the center of the upper surface of the metal base body through epoxy resin glue, the polarization direction of the piezoelectric ceramic plate points to the lower surface from the upper surface, and the piezoelectric ceramic plate is used for driving the metal base body to do longitudinal vibration or bending vibration or coupled vibration of the longitudinal vibration and the bending vibration under the excitation of an external single-phase excitation signal as shown in fig. 7a, and further driving rotors at two ends to reversely rotate by utilizing friction force; the metal matrix both sides are fixed at the opening part of first exposed core, second exposed core respectively through interference fit, have reduced fixture to the influence of stator module vibration mode to the maximize.
As shown in fig. 3, the pre-tightening force applying assembly includes a supporting member, a first torsion spring, a second torsion spring, a fixing member, a first connecting rod, a second connecting rod, and a locking bolt; the supporting piece is a hollow truncated cone with a closed upper end and an open lower end, and comprises a top plate and first to fourth side plates; the first side plate is fixedly connected with the sliding block on the first mounting plate, so that the supporting piece can freely slide up and down along the sliding groove on the first mounting plate; the top plate, the second side plate and the fourth side plate are vertically and fixedly connected with the first side plate; an included angle between the third side plate and the top plate is an obtuse angle; the first side plate is provided with a threaded hole matched with the locking bolt, and the locking bolt is in threaded connection with the threaded hole in the first side plate and penetrates through the first side plate to abut against the first mounting plate; a notch for the pre-tightening force applying assembly to pass through is formed in the second mounting plate; the fixing piece is U-shaped; the third side plate is provided with a U-shaped groove matched with the fixing piece, and the fixing piece is fixed in the groove of the third side plate and fixedly connected with the third side plate; in fig. 3, a threaded hole is formed in the third side plate and fixedly connected with the third side plate through a fixing bolt, a fixing gasket is arranged below the fixing bolt, and the fixing piece is pressed through the gasket to fixedly connect the fixing piece with the third side plate; two ends of the fixing piece are fixedly connected with one ends of the first torsion spring and the second torsion spring respectively; the other ends of the first torsion spring and the second torsion spring are fixedly connected with the other ends of the first connecting rod and the second connecting rod respectively; be equipped with respectively on the base with head rod, second connecting rod assorted mounting hole, the other end of head rod, second connecting rod links firmly through interference fit and base for the drive at metal base member both ends is sufficient to offset with the lateral wall of the drive disc of first rotor subassembly, second rotor subassembly respectively, thereby drives the drive disc of first rotor subassembly, second rotor subassembly and rotates when making the metal base member vibration, and then drives the pivot rotation. The pretightening force applying assembly is used for adjusting the pressure between the driving feet at two ends of the metal base body and the side walls of the driving discs of the first rotor assembly and the second rotor assembly.
As shown in fig. 3, a is the angle between the plane of the fixing element and the first connecting rod, which is about 57 °. In order to increase the friction force, the driving feet are required to be in line contact or surface contact with the outer surface of the driving disc, so that the metal base body is required to be kept horizontal all the time in the operation process of the actuator, namely, the base body is required to be kept horizontal all the time, and further the first connecting rod and the second connecting rod are required to be kept horizontal all the time. As shown in fig. 3, in order to achieve the purpose of applying the pre-tightening force, θ < α =57 °, θ may be 55 °, 53 °, 50 °, 47 °, 45 °, or the like, that is, β may be 125 °, 127 °, 130 °, 133 °, 135 °, or the like.
The stator assembly, the rotor assembly and the pretightening force applying assembly are symmetrical about the geometric center of the stator assembly, and the uniform distribution and consistency of pretightening force between the stator and the rotor at two ends are facilitated.
Through the meshing action between the gears fixed on the two rotating shafts and the friction force between the stator and the rotor, the unstable phenomenon that the stator assembly tilts up and down around the geometric center of the stator assembly caused by the elasticity of the torsion spring device is prevented; in addition, the gear also limits the rotation direction between the two rotors of the actuator to be opposite, so that the rotating speeds of the rotating shafts at the two ends are ensured to be the same, when the gear is applied to a miniature underwater robot, after the propellers are assembled, the consistency of the output thrust of the propellers at the two ends is effectively ensured, and the phenomenon of in-situ rotation of the miniature underwater robot is prevented.
Fig. 5 (a) and 5 (b) are schematic diagrams of the working modes of the second-order bending vibration and the first-order longitudinal vibration of the medium metal matrix according to the present invention, respectively.
The piezoelectric ceramic plates are all polarized along the thickness direction, and the polarization direction points to the metal substrate when the piezoelectric ceramic plates are pasted, as shown in fig. 7 (a). The lead wire outside 2 area of the piezoelectric ceramic piece is connected with the single-phase excitation signal, the 1 area is connected with the metal substrate and is grounded, as shown in fig. 7 (b), wherein the single-phase excitation signal is any one of sine wave, triangular wave and square wave, here, the sine signal sin ω t is taken as an example for explanation, when sine signal with proper frequency is applied to the piezoelectric ceramic piece, the piezoelectric ceramic piece can generate ultrasonic vibration according to inverse piezoelectric effect, and further can excite the second-order bending vibration mode of the metal substrate, as shown in fig. 5 (a), when energy is transmitted to the driving feet, mass points on the driving feet at two ends can be caused to vibrate up and down microscopically, due to the action of pretightening force, the driving feet at two ends respectively abut against the outer surface of the driving disks at two ends, and further can drive the driving disks at two ends to rotate through friction, and drive the rotating shaft fixedly connected. Due to the central symmetry of the structural design and the meshing effect of the gear assembly, macroscopically, the two rotors rotate in opposite directions, i.e., the left rotor rotates counterclockwise, and the right rotor rotates clockwise, as shown in fig. 6 (a). Further changing the output frequency of the sinusoidal signal can excite the first-order longitudinal vibration mode of the metal matrix, as shown in fig. 5 (b), to cause the mass points on the driving feet at the two ends to vibrate left and right microscopically, and the rotating shafts at the two ends are driven to rotate in opposite directions through friction, that is, the left rotor rotates clockwise, and the right rotor rotates counterclockwise, as shown in fig. 6 (b). In addition, in the research, the gear assembly is removed, the output frequency of the sine signal is changed, and the longitudinal bending coupling vibration of the metal matrix can be excited, so that the rotors at the two ends are driven to rotate clockwise or counterclockwise simultaneously.
The utility model also discloses a drive method of this biax output type piezoelectric actuator that connects in parallel contains following step:
the piezoelectric ceramic piece is connected to a single-phase excitation signal under a preset frequency threshold, and generates ultrasonic vibration according to an inverse piezoelectric effect, so that a metal substrate fixedly connected with the piezoelectric ceramic piece is driven to generate longitudinal vibration or bending vibration or coupling vibration of the longitudinal vibration and the bending vibration, and the coupling vibration is transmitted to the driving foot to show the coupling of microscopic up-and-down vibration, left-and-right vibration or two kinds of vibration, so that the driving disk is driven to rotate by using the friction force between the driving foot and the driving disk, and the rotating shaft fixedly connected with the driving disk is driven to rotate.
The single-phase excitation signal is any one of sine wave, triangular wave and square wave.
The piezoelectric ceramic piece in the stator component of the medium-voltage actuator of the utility model generates ultrasonic vibration under the excitation of a certain frequency electric signal, so as to cause the metal matrix to do longitudinal vibration or bending vibration or the coupled vibration of the longitudinal vibration and the bending vibration, and further utilize the friction force to drive the rotors at the two ends to rotate in opposite directions, and the piezoelectric ceramic piece can be matched with a positive and negative screw propeller to be used for providing power for mechanisms such as a micro underwater robot; the utility model realizes the rotary motion in two directions through one driving device, has double output capacity and compact structure, and can meet the miniaturization requirement; the piezoelectric ceramic piece in the stator assembly of the utility model adopts a patch form, and compared with a sandwich structure, the piezoelectric ceramic piece is easier to replace when being damaged; the utility model adopts the torsional spring device for the first time, saves structures such as a pre-tightening bolt, overcomes the difficult problem that the clamping rigidity and the elastic supporting function of the existing clamping device are not easy to coordinate, and has convenient assembly and easy miniaturization; the utility model provides a piezoelectric actuator structure has very good symmetry, and the symmetry on this kind of structure control characteristic and the impedance characteristic is favorable to the controller design of actuator, uses for example cooperation positive and negative screw, provides power for miniature rotor craft, miniature underwater robot etc..
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The above-mentioned embodiments further describe the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A double-shaft parallel output type piezoelectric actuator is characterized by comprising a first rotor assembly, a second rotor assembly, a stator assembly, a pretightening force applying assembly and a support;
the bracket comprises a base, a first mounting plate and a second mounting plate, wherein the first mounting plate and the second mounting plate are vertically arranged on the base and are parallel to each other; the first mounting plate and the second mounting plate are provided with a first mounting hole and a second mounting hole; a vertical sliding groove is formed in the first mounting plate, and a sliding block is arranged in the sliding groove;
the first rotor assembly and the second rotor assembly respectively comprise a rotating shaft, a gear and a driving disc; one end of the rotating shaft is fixedly connected with the rotating shaft of the gear, the other end of the rotating shaft is vertically and fixedly connected with the center of the driving disc, and the plane where the gear is located is parallel to the plane where the driving disc is located;
a rotating shaft of the first rotor assembly penetrates through first mounting holes of the first mounting plate and the second mounting plate respectively and is connected with the first mounting plate and the second mounting plate through bearings; a rotating shaft of the second rotor assembly penetrates through second mounting holes of the first mounting plate and the second mounting plate respectively and is connected with the first mounting plate and the second mounting plate through bearings; the rotating shaft of the first rotor assembly is parallel to the rotating shaft of the second rotor assembly, and the gear of the first rotor assembly is meshed with the gear of the second rotor assembly;
the stator component comprises a metal matrix, a piezoelectric ceramic piece, a base, a first clamping end and a second clamping end; the first clamping end and the second clamping end are arranged on the base, are in a [ -shape and comprise a vertical edge and two parallel transverse edges, and the openings of the first clamping end and the second clamping end are opposite; the metal substrate is a rhombic thin sheet, two ends of the metal substrate are provided with driving feet, and two sides of the metal substrate are fixed at openings of the first clamping end and the second clamping end respectively in an interference fit manner; the piezoelectric ceramic piece is circular, is arranged at the center of the upper surface of the metal substrate, and the polarization direction of the piezoelectric ceramic piece points to the lower surface from the upper surface, and is used for driving the metal substrate to do longitudinal vibration or bending vibration or coupling vibration of the longitudinal vibration and the bending vibration under the excitation of an external single-phase excitation signal;
the pre-tightening force applying assembly comprises a supporting piece, a first torsion spring, a second torsion spring, a fixing piece, a first connecting rod, a second connecting rod and a locking bolt;
the supporting piece is a hollow truncated cone with a closed upper end and an open lower end, and comprises a top plate and first to fourth side plates; the first side plate is fixedly connected with the sliding block on the first mounting plate, so that the supporting piece can freely slide up and down along the sliding groove on the first mounting plate; the top plate, the second side plate and the fourth side plate are vertically and fixedly connected with the first side plate; an included angle between the third side plate and the top plate is an obtuse angle; the first side plate is provided with a threaded hole matched with the locking bolt, and the locking bolt is in threaded connection with the threaded hole in the first side plate and penetrates through the first side plate to abut against the first mounting plate; a notch for the pretightening force applying assembly to pass through is formed in the second mounting plate;
the fixing piece is U-shaped; the third side plate is provided with a U-shaped groove matched with the fixing piece, and the fixing piece is fixed in the groove of the third side plate and fixedly connected with the third side plate;
two ends of the fixing piece are fixedly connected with one ends of the first torsion spring and the second torsion spring respectively; the other ends of the first torsion spring and the second torsion spring are fixedly connected with the other ends of the first connecting rod and the second connecting rod respectively;
the base is respectively provided with mounting holes matched with the first connecting rod and the second connecting rod, and the other ends of the first connecting rod and the second connecting rod are fixedly connected with the base through interference fit, so that driving feet at two ends of the metal base body are respectively abutted against the side walls of the driving discs of the first rotor assembly and the second rotor assembly, and the metal base body drives the driving discs of the first rotor assembly and the second rotor assembly to rotate when vibrating; the pretightening force applying assembly is used for adjusting the pressure between the driving feet at two ends of the metal substrate and the side walls of the driving discs of the first rotor assembly and the second rotor assembly.
2. The piezoelectric actuator according to claim 1, wherein the drive disk is made of phosphor bronze or stainless steel.
3. The piezoelectric actuator according to claim 1, wherein the drive disk is made of carbon fiber, PPS, ceramic, or teflon.
4. The piezoelectric actuator of claim 1, wherein the metal substrate has a thickness of 2 mm.
5. The biaxial parallel output type piezoelectric actuator according to claim 1, wherein the piezoelectric ceramic plate has a thickness of 1 mm.
6. The piezoelectric actuator according to claim 1, wherein the upper surfaces of the drive legs at both ends of the metal base are chamfered at an angle of 45 ° from the horizontal plane and a length of 0.5 mm.
7. The piezoelectric actuator according to claim 1, wherein friction materials are fixed to surfaces of the drive legs at both ends of the metal base, and the friction materials are made of aluminum oxide.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110198142A (en) * | 2019-04-24 | 2019-09-03 | 南京航空航天大学 | A kind of twin shaft parallel output type piezoelectric actuator and its driving method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110198142A (en) * | 2019-04-24 | 2019-09-03 | 南京航空航天大学 | A kind of twin shaft parallel output type piezoelectric actuator and its driving method |
| CN110198142B (en) * | 2019-04-24 | 2024-03-22 | 南京航空航天大学 | Double-shaft parallel output type piezoelectric actuator and driving method thereof |
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