CN111342697A - A bridge piezoelectric drive linear actuator and control method - Google Patents

Abstract

The invention belongs to the technical field of piezoelectric actuators, and in particular relates to a bridge-type piezoelectric drive linear actuator and a control method. The bridge-type piezoelectric drive linear actuator includes an upper cover, a casing, a flexible hinge micro-movement mechanism, a push rod and a piezoelectric ceramic drive. The casing is provided with a flexible hinge micro-motion mechanism, and the flexible hinge micro-motion mechanism is provided with There is a piezoelectric ceramic driver and a push rod. There are grooves on both sides of the casing corresponding to the two ends of the push rod. The two ends of the push rod extend to the outside of the casing through the grooves on the casing. The push rod is located in the drive chute on the flexible hinge micro-movement mechanism, and a ball plate is arranged between the push rod and the wall of the drive chute to make it in Hertzian contact. The beneficial effects are as follows: the structure is simple and compact, the motion control of the two driving heads in two directions is realized by a piezoelectric ceramic driver, the cost is low, and the control method is simple.

Description

A bridge piezoelectric drive linear actuator and control method

technical field

The invention belongs to the technical field of piezoelectric actuators, and particularly relates to a bridge-type piezoelectric drive linear actuator and a control method.

Background technique

Piezoelectric actuators mainly include: (1) Signal-controlled inertial piezoelectric actuators, the driving principle of which is to use an asymmetrical driving signal as a power source, and to match the symmetrical friction in the forward and backward directions to achieve driving, but It requires a complex and precise signal control system in the resume, which brings certain difficulties to the miniaturization and integration of the actuator; (2) Friction-controlled inertial piezoelectric precision actuator, whose driving principle is to use symmetrical drive The driving force generated by the joint action of the signal and the mechanical clamping structure is used as the power source, and the driving is realized by the asymmetric friction force in the forward and backward directions. parasitic displacement.

SUMMARY OF THE INVENTION

In order to make up for the defects of the prior art, the present invention provides a bridge piezoelectric driving linear actuator and a control method.

The present invention is achieved through the following technical solutions:

A bridge type piezoelectric drive linear actuator, comprising an upper cover, a casing, a flexible hinge micro-movement mechanism, a push rod and a piezoelectric ceramic drive, the casing is provided with a flexible hinge micro-motion mechanism, and the flexible hinge micro-motion mechanism is arranged on the flexible hinge micro-motion mechanism. A piezoelectric ceramic driver and a push rod are provided. There are grooves on both sides of the casing corresponding to the two ends of the push rod. The two ends of the push rod extend to the outside of the casing through the grooves on the casing. The flexible hinge micro-movement mechanism is provided with a drive The chute, the push rod is located in the drive chute on the flexible hinge micro-movement mechanism, and a ball plate is arranged between the push rod and the wall of the drive chute to make hertz contact.

Further, the flexible hinge micro-moving mechanism is hollow in the middle, the flexible hinge micro-moving mechanism is located in the middle hollow with semi-circular driving heads symmetrically on both sides, the push rod is located between the two semi-circular driving heads, and the piezoelectric ceramic The driver is located in the hollow in the middle of the flexible hinge micro-movement mechanism.

Further, the piezoelectric ceramic driver is installed on the hollow inside the flexible hinge micro-movement mechanism through pre-tightening bolts, and the assembly direction is consistent with the long axis direction of the push rod.

Further, one side of the flexible hinge micro-moving mechanism is located on the two semi-circular driving heads and respectively provided with ball plates.

A control method for a bridge-type piezoelectric drive linear actuator. The ball plate is in Hertzian contact with the flexible hinge micro-movement mechanism, and the stick-slip drive mode of the drive head drives the push rod to move in the axial direction; the upper cover and the drive The contact between the heads through the ball plate can constrain the driving head to prevent it from generating parasitic displacement during the movement process, and use the preload bolt to adjust the preload of the piezoelectric ceramic driver; through the voltage drive of the asymmetric triangular wave, the piezoelectric ceramic can be realized. In the stick-slip drive of the driver, the preload can be adjusted by adjusting the applied static voltage, and the moving speed and moving direction can be adjusted by adjusting the applied dynamic voltage.

The beneficial effects of the invention are that the structure is simple and compact, the motion control of the two driving heads in two directions is realized by a piezoelectric ceramic driver, the cost is low, and the control method is simple.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings.

Accompanying drawing 1 is the structural representation of the present invention;

FIG. 2 is a schematic structural diagram of the flexible hinge micro-movement mechanism of the present invention.

In the figure, 1 upper cover, 2 shell, 3 groove, 4 flexible hinge micro-movement mechanism, 5 push rod, 6 ball plate, 7 drive chute, 8 piezoelectric ceramic driver.

Detailed ways

Figures 1 and 2 are a specific embodiment of the present invention. This invention is a bridge type piezoelectric drive linear actuator, which includes an upper cover 1, a casing 2, a flexible hinge micro-movement mechanism 4, a push rod 5 and a piezoelectric ceramic drive, and the casing 2 is provided with a flexible hinge micro-motion mechanism 4. The flexible hinge micro-movement mechanism 4 is provided with a piezoelectric ceramic driver 8 and a push rod 5. The two sides of the casing 2 correspond to the two ends of the push rod 5 with grooves 3 respectively, and the two ends of the push rod 5 pass through the grooves on the casing 2. 3 extends to the outside of the housing 2, the flexible hinge micro-movement mechanism 4 is provided with a driving chute 7, the push rod 5 is located in the driving chute 7 on the flexible hinge micro-motion mechanism 4, and the push rod 5 and the driving chute 7 groove Ball plates 6 are provided between the walls so that they are in Hertzian contact.

Further, the flexible hinge micro-moving mechanism 4 is hollow in the middle, the flexible hinge micro-moving mechanism 4 is located in the middle hollow with semi-circular driving heads symmetrically on both sides, and the push rod 5 is located between the two semi-circular driving heads. The piezoelectric ceramic driver 8 is located in a hollowed out place in the middle of the flexible hinge micro-moving mechanism 4 .

Further, the piezoelectric ceramic driver 8 is installed at the hollow inside the flexible hinge micro-movement mechanism 4 through pre-tightening bolts, and the assembly direction is consistent with the long axis direction of the push rod 5 .

Further, one side of the flexible hinge micro-moving mechanism 4 is located on the two semicircular driving heads, respectively, with ball plates 6 .

A control method of a bridge-type piezoelectric drive linear actuator, the ball plate 6 is in Hertzian contact with the flexible hinge micro-movement mechanism 4, and the push rod 5 is driven to move in the axial direction through the stick-slip drive mode of the drive head; The contact between the cover 1 and the driving head is made by the ball plate 6, which can restrain the driving head and prevent it from generating parasitic displacement during the movement process, and use the preload bolt to adjust the preload of the piezoelectric ceramic driver 8; through the voltage of the asymmetric triangle wave Drive, realize the stick-slip drive of the piezoelectric ceramic driver 8, adjust the applied static voltage to adjust the preload, and adjust the applied dynamic voltage to adjust the movement speed and movement direction.

The present invention is not limited to the above-mentioned embodiments, and anyone should know that the technical solutions that are identical or similar to the present invention made under the inspiration of the present invention fall within the protection scope of the present invention.

The technology, shape, and structural part that are not described in detail in the present invention are all well-known technologies.

Claims (5)

1. The utility model provides a bridge type piezoelectricity drive linear actuator, includes upper cover, shell, flexible hinge fine motion mechanism, push rod and piezoceramics drive, its characterized in that, be equipped with flexible hinge fine motion mechanism in the shell, be equipped with piezoceramics driver and push rod on the flexible hinge fine motion mechanism, the shell both sides correspond the push rod both ends and are equipped with the recess respectively, outside the recess that the push rod both ends were passed through on the shell extended to the shell, be equipped with the drive spout on the flexible hinge fine motion mechanism, the push rod lies in the drive spout on the flexible hinge fine motion mechanism, is equipped with the ball board between push rod and the drive spout cell wall, makes it become the Her.

2. A bridge piezoelectric driven linear actuator as claimed in claim 1 wherein: the middle of the flexible hinge micro-motion mechanism is hollowed, semicircular driving heads are symmetrically arranged at two sides of the hollowed part in the middle of the flexible hinge micro-motion mechanism, the push rod is positioned between the two semicircular driving heads, and the piezoelectric ceramic driver is positioned at the hollowed part in the middle of the flexible hinge micro-motion mechanism.

3. A bridge piezoelectric driven linear actuator as claimed in claim 1 wherein: the piezoelectric ceramic driver is installed at a hollow-out position inside the flexible hinge micro-motion mechanism through a pre-tightening bolt, and the assembling direction is consistent with the long axis direction of the push rod.

4. A bridge piezoelectric driven linear actuator as claimed in claim 1 wherein: and ball plates are respectively arranged on the two semicircular driving heads on one side of the flexible hinge micro-motion mechanism.

5. A control method of a bridge type piezoelectric driving linear actuator is characterized in that: the ball plate is in Hertz contact with the flexible hinge micro-motion mechanism, and the push rod is driven to move in the axial direction in a stick-slip driving mode of the driving head; the upper cover is in contact with the driving head through the ball plate, so that the driving head can be restrained, parasitic displacement of the driving head in the motion process is prevented, and the pre-tightening of the piezoelectric ceramic driver is adjusted by the pre-tightening bolt; the piezoelectric ceramic driver is driven by the voltage of the asymmetric triangular wave to realize the stick-slip driving of the piezoelectric ceramic driver, the pretightening force can be adjusted by adjusting the applied static voltage, and the movement speed and the movement direction can be adjusted by adjusting the applied dynamic voltage.

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