CN210246628U - Friction force controllable linear piezoelectric actuator - Google Patents
Friction force controllable linear piezoelectric actuator Download PDFInfo
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- CN210246628U CN210246628U CN201920987092.5U CN201920987092U CN210246628U CN 210246628 U CN210246628 U CN 210246628U CN 201920987092 U CN201920987092 U CN 201920987092U CN 210246628 U CN210246628 U CN 210246628U
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Abstract
The utility model discloses a friction force controllable linear piezoelectric actuator, which comprises a rotating block, a contact head, a fixed block, a rotor, laminated piezoelectric ceramics, a mass block and an elastic element; the mover can move along a first direction; the fixed block is fixedly arranged on the rotor, one end of the laminated piezoelectric ceramic is fixedly arranged on the side wall of the fixed block, the other end of the laminated piezoelectric ceramic is fixedly connected with the mass block, and the fixed block, the laminated piezoelectric ceramic and the mass block are sequentially arranged along a first direction; the second end of the rotating block can swing around the first end, a contact head is fixedly arranged at the second end of the rotating block, and the elastic element is connected with the rotating block to enable the contact head to be pressed against the rotor.
Description
Technical Field
The utility model relates to a piezoelectricity precision braking technical field especially relates to a controllable formula straight line piezoelectric actuator of frictional force.
Background
The inverse piezoelectric effect of piezoelectric ceramics can convert electric energy into mechanical energy, and the optimization of the manufacturing process in recent years enables the piezoelectric ceramics to realize large-scale production, and the laminated piezoelectric ceramics are more and more applied to precision driving. The piezoelectric linear motor manufactured by utilizing the inverse piezoelectric effect of the laminated piezoelectric ceramic has the advantages of high displacement resolution, large bearing capacity, high output rigidity, good output displacement repeatability, simplicity in control and easiness in operation, and can overcome the problems of electromagnetic interference, high temperature, low temperature and the like.
At present, the modes capable of realizing large-stroke precise stepping driving mainly comprise an inchworm type precise driving mode and an inertia driving mode. The inchworm type precision drive can provide higher precision and thrust, but the drive frequency is lower due to the complex structure, so that the drive speed is low, the control difficulty is increased due to the complex structure, and the installation precision is difficult to control; in addition, the fit abrasion of the ruler-wok type precision drive is serious, and finally poor contact is caused, so that the drive of the piezoelectric ceramic generates errors, and the performance is weakened. The inertia friction piezoelectric driving device has the advantages of simple structure, easy control and high driving speed, but the friction inertia piezoelectric driving device is lack of a clamping mechanism to cause insufficient pretightening force and small thrust. For example, although the whole structure of the linear piezoelectric motor with the chinese patent No. CN204361935U and the patent name of inertia type medium structure is relatively simple, it does not provide a device with adjustable friction force, and only controls the speed and step pitch of the motor by the inverse piezoelectric effect of the piezoelectric ceramic, so that the above disadvantages exist.
SUMMERY OF THE UTILITY MODEL
The utility model provides a controllable formula straight line piezoelectric actuator of frictional force, it has overcome the not enough that the straight line piezoelectric motor of the medium-sized structure of inertia formula exists among the background art.
The utility model provides an adopted technical scheme of its technical problem is:
a friction force controllable linear piezoelectric actuator comprises a rotating block, a contact head, a fixed block, a rotor, laminated piezoelectric ceramics, a mass block and an elastic element; the mover can move along a first direction; the fixed block is fixedly arranged on the rotor, the extension direction of the laminated piezoelectric ceramics is arranged along a first direction, one end of the laminated piezoelectric ceramics is fixedly arranged on the side wall of the fixed block, the other end of the laminated piezoelectric ceramics is fixedly connected with the mass block, and the fixed block, the laminated piezoelectric ceramics and the mass block are sequentially arranged along the first direction; the second end of the rotating block can swing around the first end, a contact head is fixedly arranged at the second end of the rotating block, the elastic element is connected with the rotating block to enable the contact head to be pressed on the rotor, and the static friction force generated between the contact head and the rotor is larger than the reverse acting force on the rotor when the laminated piezoelectric ceramic contracts.
In one embodiment: the mass block and the rotor are arranged at intervals, and the mass block is connected to the laminated piezoelectric ceramics in a suspension mode.
In one embodiment: the elastic element comprises a spring capable of adjusting the telescopic amount, and the lower end of the spring abuts against the middle of the top surface of the rotating block.
In one embodiment: the first direction is the horizontal direction, the fixed block is fixedly arranged on the top surface of the rotor, and the contact head presses against the top surface of the rotor.
In one embodiment: the contact head at the second end of the rotating block is pressed against the left part of the top surface of the rotor, and the fixing block is fixedly arranged at the position close to the right of the middle part of the top surface of the rotor; the fixed block, the laminated piezoelectric ceramic and the mass block are arranged in sequence from left to right.
In one embodiment: the mass block structure is of a square structure, the cross section of the laminated piezoelectric ceramic is square, and the end face of the laminated piezoelectric ceramic is partially or completely overlapped with the end face of the mass block.
Compared with the background technology, the technical scheme has the following advantages:
the elastic element is pressed against the rotating block to press the contact head of the rotating block against the rotor, so that friction force can be generated between the rotor and the contact head, and the friction force is matched with the rotor driven by the laminated piezoelectric ceramic, therefore, the generated thrust is large, and the power-off self-locking function is realized.
The end face of the laminated piezoelectric ceramic is fixedly connected with the end face of the mass block and is partially or completely overlapped, mechanical energy is transmitted to the end face of the mass block through the end face of the laminated piezoelectric ceramic, and the transmission effect is better.
The flexible volume of spring is adjustable, through the pretightning force of the steerable motor of flexible volume of regulation spring, under the same condition of jump voltage, through the flexible volume of regulation spring, can control the step of motor, consequently can not only control the speed and the step of motor operation through piezoceramics's converse piezoelectricity effect, but also can control the speed and the step of motor operation through frictional force.
Drawings
The present invention will be further described with reference to the accompanying drawings and the following detailed description.
Fig. 1 is a schematic structural diagram of a friction force controllable linear piezoelectric actuator according to an embodiment.
FIG. 2 is a timing diagram of voltage signals of a laminated piezoelectric ceramic of a friction force controllable linear piezoelectric actuator according to an embodiment.
Description of reference numerals: 10-rotating block, 20-contact, 30-fixed block, 40-mover, 50-laminated piezoelectric ceramic, 60-mass block, and 70-spring.
Detailed Description
Referring to fig. 1, a friction-controllable linear piezoelectric actuator includes a rotary block 10, a contact 20, a fixed block 30, a mover 40, a laminated piezoelectric ceramic 50, a mass block 60, and a spring 70, wherein the mass block 60 has a square structure, and the section of the laminated piezoelectric ceramic 50 is square.
The mover 40 can move horizontally, and has a specific structure as follows: two lower rollers and an upper roller are additionally arranged, the bottom surface of the rotor 40 is supported and connected on the two lower rollers, the upper roller is connected on the top surface of the rotor 40, and the rotor 40 is moved to roll through the rollers. The lower roller and the upper roller are both rotationally arranged on a fixed object, such as a rack or a shell.
The fixing block 30 is fixed on the mover 40, and the fixing block 30 is fixed on the top surface of the mover 40 by screws.
One end face of the laminated piezoelectric ceramic 50 is fixedly connected to the side wall of the fixed block 30, the other end face of the laminated piezoelectric ceramic 50 is fixedly connected with the mass block 60, the fixed block 30, the laminated piezoelectric ceramic 50 and the mass block 60 are sequentially arranged along the horizontal direction, and the extension direction of the laminated piezoelectric ceramic is arranged along the horizontal direction. In the concrete structure: the end face of the laminated piezoelectric ceramic 50 is partially or completely overlapped and fixedly connected with the end face of the mass block 60, and the fixedly connected is bonding or welding and the like. Preferably, the bottom surface of the mass block 60 and the top surface of the mover 40 are spaced up and down, so that the mass block 60 is connected to the laminated piezoelectric ceramic 50 in a suspended manner.
The second end of the rotating block 10 can swing around the first end, a contact 20 is fixedly arranged below the second end, and the contact 20 abuts against the top surface of the mover 40. The rotary block 10 is connected with the elastic element 70 to make the rotary block 10 receive downward elastic force, make the rotary block 10 receive downward torque, make the contact head 20 press contact the top surface of the mover 40, wherein the static friction force generated between the contact head 20 and the mover 40 is greater than the reverse acting force to the mover 40 when the laminated piezoelectric ceramic 50 contracts. In the concrete structure: the first end of the rotating block 10 can be rotatably connected to a fixed object; the lower end of the elastic element 70 is propped against and connected to the middle part of the top surface of the rotating block 10, and the upper end of the elastic element 70 is propped against a fixed object; the elastic element 70 is a spring, the expansion amount of the spring is adjustable, the pretightening force of the motor is controlled by adjusting the expansion amount of the spring, and the step pitch of the motor can be controlled by adjusting the expansion amount of the spring under the condition of the same jump voltage.
Further: the contact 20 at the second end of the rotating block 10 is pressed against the left part of the top surface of the mover 40, and the fixed block 30 is fixedly arranged at the position close to the right of the middle part of the top surface of the mover 40; the fixed block 30, the laminated piezoelectric ceramics 50, and the mass block 60 are arranged in order from left to right.
Referring to fig. 1 and 2, the method for controlling a friction-controllable linear piezoelectric actuator includes: in the initial position, the mover 40 is in a static state, and the friction force between the contact 20 and the mover 40 is zero; in the first half period (0-T/2), when the laminated piezoelectric ceramic 50 receives a sudden change signal (from 0 to voltage V, and the voltage V is maintained in the first half period) of a rising edge, the laminated piezoelectric ceramic 50 suddenly extends due to the inverse piezoelectric effect, and drives the mass block 60 to move at a certain speed in the extending direction, at this time, the friction provided by the contact 20 cannot make the mover 40 in a static state, and at the moment of jumping, the mover 40 moves for a certain distance in the opposite direction of the movement of the mass block 60 due to the momentum conservation law; in the second half period (T/2-T), the laminated piezoelectric ceramic 50 receives a continuous signal to contract (the voltage V in the second half period gradually changes to 0), the laminated piezoelectric ceramic 50 drives the mass block 60 to move in the contraction direction, and at this time, the static friction force generated by the contact 20 and the mover 40 makes the mover 40 in a static state until the laminated piezoelectric ceramic 50 returns to the initial state, thereby completing a period of stepping motion. Under the control of the driving signal, the steps are repeated, and the cycle is repeated.
The above description is only a preferred embodiment of the present invention, and therefore the scope of the present invention should not be limited by this description, and all equivalent changes and modifications made within the scope and the specification of the present invention should be covered by the present invention.
Claims (6)
1. The utility model provides a controllable formula straight line piezoelectric actuator of frictional force which characterized in that: the piezoelectric actuator comprises a rotating block, a contact head, a fixed block, a rotor, laminated piezoelectric ceramics, a mass block and an elastic element; the mover can move along a first direction; the fixed block is fixedly arranged on the rotor, the extension direction of the laminated piezoelectric ceramics is arranged along a first direction, one end of the laminated piezoelectric ceramics is fixedly arranged on the side wall of the fixed block, the other end of the laminated piezoelectric ceramics is fixedly connected with the mass block, and the fixed block, the laminated piezoelectric ceramics and the mass block are sequentially arranged along the first direction; the second end of the rotating block can swing around the first end, a contact head is fixedly arranged at the second end of the rotating block, the elastic element is connected with the rotating block to enable the contact head to be pressed on the rotor, and the static friction force generated between the contact head and the rotor is larger than the reverse acting force on the rotor when the laminated piezoelectric ceramic contracts.
2. A friction force controllable linear piezoelectric actuator as claimed in claim 1 wherein: the mass block and the rotor are arranged at intervals, and the mass block is connected to the laminated piezoelectric ceramics in a suspension mode.
3. A friction force controllable linear piezoelectric actuator as claimed in claim 1 wherein: the elastic element comprises a spring capable of adjusting the telescopic amount, and the lower end of the spring abuts against the middle of the top surface of the rotating block.
4. A friction force controllable linear piezoelectric actuator as claimed in claim 1 wherein: the first direction is the horizontal direction, the fixed block is fixedly arranged on the top surface of the rotor, and the contact head presses against the top surface of the rotor.
5. A friction force controllable linear piezoelectric actuator as claimed in claim 4 wherein: the contact head at the second end of the rotating block is pressed against the left part of the top surface of the rotor, and the fixing block is fixedly arranged at the position close to the right of the middle part of the top surface of the rotor; the fixed block, the laminated piezoelectric ceramic and the mass block are arranged in sequence from left to right.
6. A friction force controllable linear piezoelectric actuator as claimed in claim 1 wherein: the mass block structure is of a square structure, the cross section of the laminated piezoelectric ceramic is square, and the end face of the laminated piezoelectric ceramic is partially or completely overlapped with the end face of the mass block.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920987092.5U CN210246628U (en) | 2019-06-27 | 2019-06-27 | Friction force controllable linear piezoelectric actuator |
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| CN201920987092.5U CN210246628U (en) | 2019-06-27 | 2019-06-27 | Friction force controllable linear piezoelectric actuator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110224632A (en) * | 2019-06-27 | 2019-09-10 | 华侨大学 | Frictional force controllable linear piezo actuator and its control method |
| CN113309813A (en) * | 2021-06-01 | 2021-08-27 | 大连理工大学 | Semi-active vibration absorption and energy dissipation control system for restraining vortex-induced vibration of bridge |
-
2019
- 2019-06-27 CN CN201920987092.5U patent/CN210246628U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110224632A (en) * | 2019-06-27 | 2019-09-10 | 华侨大学 | Frictional force controllable linear piezo actuator and its control method |
| CN110224632B (en) * | 2019-06-27 | 2024-02-27 | 华侨大学 | Friction force controllable linear piezoelectric actuator and control method thereof |
| CN113309813A (en) * | 2021-06-01 | 2021-08-27 | 大连理工大学 | Semi-active vibration absorption and energy dissipation control system for restraining vortex-induced vibration of bridge |
| CN113309813B (en) * | 2021-06-01 | 2022-03-04 | 大连理工大学 | Semi-active vibration absorption and energy dissipation control system for restraining vortex-induced vibration of bridge |
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