CN115566929A - Adjustable piezoelectric driving type sleeve unfolding and folding mechanism - Google Patents
Adjustable piezoelectric driving type sleeve unfolding and folding mechanism Download PDFInfo
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- CN115566929A CN115566929A CN202211401608.6A CN202211401608A CN115566929A CN 115566929 A CN115566929 A CN 115566929A CN 202211401608 A CN202211401608 A CN 202211401608A CN 115566929 A CN115566929 A CN 115566929A
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- 230000007246 mechanism Effects 0.000 title claims abstract description 34
- 239000002131 composite material Substances 0.000 claims abstract description 11
- 230000000694 effects Effects 0.000 claims abstract description 3
- 230000008602 contraction Effects 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000000919 ceramic Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000003068 static effect Effects 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors
- H02N2/04—Constructional details
- H02N2/043—Mechanical transmission means, e.g. for stroke amplification
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors
- H02N2/06—Drive circuits; Control arrangements or methods
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- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
The utility model provides an adjustable piezoelectricity drive type sleeve exhibition receipts mechanism, belongs to space exhibition receipts mechanism technical field. The sleeve unfolding and folding mechanism aims at solving the problems of complex structure, high energy consumption, low unfolding and folding resolution, large mechanism mass and the like of the conventional sleeve unfolding and folding mechanism. The invention comprises a piezoelectric driver group, a driver bracket, a final stage sleeve, a primary sleeve, a positioning screw, an assembling screw and an adjusting screw; the piezoelectric driver group comprises three independent piezoelectric drivers, and each piezoelectric driver consists of a composite hinge, a piezoelectric stack, a gasket, a bolt and a positioning screw; each piezoelectric driver is adjusted by an adjusting screw and then fixed on a driver bracket by a positioning screw, so that the tail end face of the driving foot is in close contact with the outer surface of the cylinder core of the final stage sleeve; the adjusting screw is assembled on the driver bracket and used for adjusting the position of the driver; the barrel centers of the two barrels are of hollow triangular prism structures, so that the contact area between a driving foot and the driving foot can be increased, the rotational freedom of the two sleeves can be limited, and a guiding effect can be provided for the movement of the sleeves. The sleeve unfolding and folding mechanism is used for manufacturing the sleeve unfolding and folding mechanism.
Description
Technical Field
The invention relates to an adjustable piezoelectric driving type sleeve unfolding and folding mechanism, and belongs to the technical field of space unfolding and folding mechanisms.
Technical Field
The space expansion and contraction mechanism is one of the most common mechanisms in the fields of aerospace and engineering machinery. The temperature control device is simple in structure, clear in principle and less affected by temperature, so that the temperature control device is widely applied; the unfolding and folding mechanism is of various types, such as hinged truss type, winding type, inflation type, thin-wall tube type and the like, wherein the sleeve space unfolding and folding mechanism is the most commonly used one. It moves through the axis of the secondary sleeve relative to the final sleeve to achieve the unfolding action; at present, a sleeve unfolding and folding mechanism generally adopts a complex system consisting of a lead screw nut component, a rope pulley block, an electromagnetic motor and other basic components so as to achieve the purpose of unfolding and folding, and the structures generally have the problems of complex structure, weight, energy loss and the like.
The invention provides an adjustable piezoelectric driving type sleeve unfolding and folding mechanism, which aims to solve the problems of large mass, complex structure and the like of the existing space unfolding and folding mechanism.
The invention relates to an adjustable piezoelectric driving type sleeve unfolding and folding mechanism which mainly comprises a piezoelectric driver, a support, a primary sleeve and a final sleeve.
The piezoelectric actuator comprises two piezoelectric stacks, two gaskets, two machine-meter screws, two positioning screws and a composite hinge.
The piezoelectric driving assembly comprises three drivers, each driver is uniformly assembled on the support at an angle of 120 degrees, and driving feet on the drivers simultaneously drive the final stage sleeve.
And the two piezoelectric stacks are respectively arranged in the transverse and longitudinal piezoelectric stack grooves of the composite hinge and are pre-tightened and assembled by using a gasket and a screw.
The combined bracket is assembled above the primary sleeve through an assembling screw, the barrel center of the primary sleeve is matched with that of the final-stage sleeve, and at the moment, the three driving feet are in close contact with the outer surface of the barrel center of the primary sleeve; because the centers of the two sleeves are both hollow triangular prisms, the sleeves can play a role in limiting the rotational freedom degree and guiding between the two sleeves when in work.
And the two piezoelectric stacks on the same driver are assembled in a T shape.
The piezoelectric driving component has three transverse piezoelectric stacks on the same plane and three longitudinal piezoelectric stacks on the same plane.
The invention has the advantages that the driving unit is structurally arranged in the sleeve, so that the integral space utilization rate of the mechanism is greatly improved; the power source of the mechanism adopts piezoelectric ceramics, and has the advantages that: the mechanical friction is avoided, no gap is left, the motion sensitivity is high, the energy consumption is low, the size is small, the weight is light, the response speed is high, the power is high, and the unfolding and folding precision of the space sleeve unfolding and folding mechanism is greatly ensured; the driving unit has the advantages of simplicity, convenience, miniaturization and the like, the overall mass of the mechanism is effectively reduced, and the phenomenon of insufficient load of the carrier is solved to the greatest extent; the driving mode is stick-slip driving, so that lubrication is not needed to be considered, the space working environment is better adapted, and the adjustment of the friction force can be realized by adjusting the time sequence of the voltage at the two ends of the transverse piezoelectric stack; and the number of drivers can be increased to meet a greater output force according to the basic shape of the barrel core of the sleeve.
Drawings
FIG. 1 is a cross-sectional view of an adjustable piezo-actuated sleeve deployment and retraction mechanism according to the present invention;
figure 2 is a three dimensional exploded view of an adjustable piezo-driven sleeve deployment and retraction mechanism according to the present invention;
FIG. 3 is a three-dimensional exploded view of the piezoelectric actuator of FIG. 2;
FIG. 4 is an assembled schematic view of the piezoelectric actuator of FIG. 2;
FIG. 5 is a sectional view of the assembly of the primary sleeve and the final sleeve;
FIG. 6 is a timing diagram of piezoelectric stack control signals during deployment according to an embodiment;
fig. 7 is a timing diagram of control signals for the piezoelectric stack during contraction according to an embodiment.
Detailed description of the preferred embodiments
The present embodiment is described with reference to fig. 2, 3, 4, 5, 6 and 7, and the adjustable piezoelectric driving type sleeve unfolding and folding mechanism of the present embodiment comprises a piezoelectric driver (1), a bracket (2), a final sleeve (3) and a primary sleeve (4).
The piezoelectric actuator (1) comprises a transverse piezoelectric stack (1-1), a transverse gasket (1-2), a transverse machine-meter screw (1-3), a longitudinal piezoelectric stack (1-4), a longitudinal gasket (1-5), a longitudinal machine-meter screw (1-6), a positioning screw head (1-7) and a composite hinge (1-8).
The transverse piezoelectric stack (1-1) is assembled in a transverse piezoelectric stack groove of the composite hinge (1-8) through a transverse gasket (1-2) and a transverse bolt (1-3); the longitudinal piezoelectric stacks (1-4) are assembled in the longitudinal piezoelectric stack grooves of the composite hinges (1-8) through longitudinal gaskets (1-5) and longitudinal bolts (1-6).
The piezoelectric drivers (1) are uniformly distributed on the bracket (2) at an angle of 120 degrees, and each piezoelectric driver is assembled on the bracket through a positioning screw (5) and an adjusting screw (7).
The combined bracket (2) is assembled above the primary sleeve (4) through an assembling screw (6), the cylinder center of the primary sleeve (4) is matched with the cylinder center of the final-stage sleeve (3), and at the moment, the three driving feet (1-8-1) are in close contact with the outer surface of the cylinder center of the final-stage sleeve (3); because the centers of the two sleeves are both hollow triangular prisms, the sleeves can play a role in limiting the rotational freedom degree and guiding between the two sleeves when in work.
The piezoelectric actuator (1) in the embodiment adopts a stick-slip driving principle, and the driving feet (1-8-1) are tightly contacted with the outer surface of the cylinder core of the last stage sleeve (3).
The driving principle of the piezoelectric driver (1) is that the inverse piezoelectric effect of piezoelectric ceramics is used as a power source of the driver, voltage is applied to two ends of the piezoelectric ceramics to generate mechanical stress, and mutual conversion between mechanical energy and electric energy is realized; the driving principle of piezoelectric stick-slip driving is that piezoelectric ceramics is rapidly deformed to generate acceleration, namely inertia impact, so that the dynamic friction force cannot provide the acceleration of a moving object, the moving object is kept at the original position, and then the piezoelectric ceramics are controlled to return at a lower speed, so that the static friction force drives the object to move to realize micro-displacement; the piezoelectric stick-slip drive has the advantages of high response speed, no electromagnetic interference, simple structure and the like.
When the adjustable piezoelectric driving type sleeve unfolding and folding mechanism is in a working state, six piezoelectric stacks in the three groups of piezoelectric drivers (1) receive driving signals, and the transverse and longitudinal displacements and output frequencies of the driving feet (1-8-1) are controlled by controlling the voltage and frequency at the two ends of the piezoelectric stacks.
The working time sequence when the sleeve is unfolded: at 0-t 1 The stage longitudinal piezoelectric stack is driven by an electric signal to slowly extend along the x axis, and the driving foot moves along the x axis at the moment; at 0-t 1 The stage transverse piezoelectric stack is driven by an electric signal to slowly extend along the y axis, and at the moment, the positive pressure between the driving foot and the barrel center of the final-stage sleeve is increased in the y axis direction, so that the friction force between the barrel center of the final-stage sleeve and the driving foot is increased. At the same time, the sleeve is unfolded for a certain distance; at t 1 -t 2 The stage longitudinal piezoelectric stack is driven by an electric signal to slowly shrink along the x axis, and the driving foot moves along the x axis at the moment; at t 1 -t 2 The stage transverse piezoelectric stack is driven by an electric signal to slowly contract along the y axis, at the moment, the driving foot reduces the positive pressure with the cylinder center of the last stage sleeve in the y axis direction, so that the friction force between the cylinder center of the last stage sleeve and the driving foot is reduced, in the rapid contraction process, because the last stage sleeve has inertia and the friction force is reduced, at the moment, the static friction between the driving foot and the cylinder center of the last stage sleeve is changed into sliding friction, the driving foot can return to the initial position, the last stage sleeve moves forwards by a step distance, and the expansion of the sleeve mechanism is completed by repeating the processes for multiple times.
Working sequence when the sleeve contracts: at 0-t 3 The stage longitudinal piezoelectric stack is driven by an electric signal to rapidly extend along the x axis, and the driving foot moves along the x axis at the moment; at 0-t 3 The stage transverse piezoelectric stack is driven by an electric signal to rapidly extend along the y axis, and at the moment, the positive pressure between the driving foot and the cylinder core of the final-stage sleeve is increased in the y axis direction, so that the friction force between the cylinder core of the final-stage sleeve and the driving foot is increased; due to the inertia of the last stage sleeve, the sleeve is at the same time substantially immobile. At t 3 -t 4 The stage longitudinal piezoelectric stack is driven by an electric signal to slowly shrink along the x axis, and the driving foot moves along the x axis at the moment; at t 3 -t 4 The stage transverse piezoelectric stack is driven by an electric signal to slowly contract along the y axis, and the driving foot is reduced along the y axis direction and the final stageIn the process of slow shrinkage, the friction force is static friction force, the last-stage sleeve moves backwards by a step distance, and the process is repeated for multiple times, so that the shrinkage of the sleeve mechanism is completed.
The expansion and contraction of the sleeve can be achieved by the above process.
In the piezoelectric actuator (1) in the embodiment, the included angle between two adjacent actuators is 120 degrees, and three driving feet (1-8-1) are ensured to be on the same plane, and the plane is parallel to the end face of the sleeve, so that the stress on each end face of each sleeve core (the sleeve core is in a triangular prism shape) is equal.
Claims (5)
1. The utility model provides an adjustable piezoelectricity drive type sleeve exhibition receipts mechanism which characterized in that exhibition receipts mechanism includes piezoelectric actuator (1), driver support (2), last stage sleeve (3), elementary sleeve (4).
2. The adjustable piezoelectric driving type sleeve expanding and contracting mechanism according to claim 1, wherein the final stage sleeve (3) is assembled on the primary stage sleeve (4), and the barrel centers of the final stage sleeve (3) and the primary stage sleeve (4) are triangular structures, so that the degree of freedom of rotation between the two sleeves is limited, and a guiding effect is provided for the expansion and contraction of the sleeve.
3. The piezoelectric driver (1) according to claim 1 comprises a transverse piezoelectric stack (1-1), a transverse gasket (1-2), a transverse bolt (1-3), a longitudinal piezoelectric stack (1-4), a longitudinal gasket (1-5), a longitudinal bolt (1-6), a positioning screw head (1-7) and a composite hinge (1-8); the transverse piezoelectric stack (1-1) is assembled in a transverse piezoelectric stack groove of the composite hinge (1-8) through a transverse gasket (1-2) and a transverse bolt (1-3); the longitudinal piezoelectric stack (1-4) is assembled in a longitudinal piezoelectric stack groove of the composite hinge (1-8) through a longitudinal gasket (1-5) and a longitudinal machine screw (1-6); under a normal working state, the voltages at two ends of the two groups of piezoelectric stacks are increased, so that the longitudinal piezoelectric stacks (1-4) longitudinally extend to drive the driving feet (1-8-1) on the composite hinges (1-8) to move longitudinally; transversely extending the transverse piezoelectric stack (1-1) to drive the driving foot (1-8-1) on the composite hinge (1-8) to move along the transverse direction; the friction force is increased by increasing the positive pressure of the driving feet (1-8-1) and the cylinder core of the last-stage sleeve (3), so that the last-stage sleeve (3) is driven to move longitudinally; the expansion and contraction functions are realized by changing the time sequence of the voltages at the two ends of the two groups of piezoelectric stacks; the adjustment of the friction force can be realized by adjusting the time sequence of the voltage at the two ends of the transverse piezoelectric stack (1-1).
4. An adjustable piezo-electric drive type sleeve deployment and retraction mechanism according to claim 3, wherein each piezo-electric actuator (1) is mounted on the bracket (2) by means of a set screw (5), the bracket (2) is mounted on the primary sleeve (4) by means of a mounting screw (6), and the driving feet (1-8-1) on the compound hinges (1-8) are in close contact with the barrel center of the final sleeve (3).
5. An adjustable piezo-driven telescopic mechanism according to claims 1 and 3, characterized in that each driver (1) is evenly distributed on the support at 120 ° with the same axis, and each driving foot (1-8-1) is perpendicular to each plane of the triangular prism of the last stage sleeve (3) cylinder center, and the number of drivers can be increased to meet larger output force according to the basic shape of the sleeve cylinder center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211401608.6A CN115566929A (en) | 2022-11-10 | 2022-11-10 | Adjustable piezoelectric driving type sleeve unfolding and folding mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211401608.6A CN115566929A (en) | 2022-11-10 | 2022-11-10 | Adjustable piezoelectric driving type sleeve unfolding and folding mechanism |
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| Publication Number | Publication Date |
|---|---|
| CN115566929A true CN115566929A (en) | 2023-01-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211401608.6A Pending CN115566929A (en) | 2022-11-10 | 2022-11-10 | Adjustable piezoelectric driving type sleeve unfolding and folding mechanism |
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| Country | Link |
|---|---|
| CN (1) | CN115566929A (en) |
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2022
- 2022-11-10 CN CN202211401608.6A patent/CN115566929A/en active Pending
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