Linear motor type piezoelectric screw

Abstract

The utility model relates to the technical field of precise driving and positioning, and discloses a linear motor type electric screw which comprises a screw rod, a shell, a driving mechanism, a mechanism seat and a threaded pipe. The driving mechanism is arranged in a cavity defined by the shell and the mechanism base. The driving mechanism comprises a flexible hinge, piezoelectric ceramics and a pre-tightening spring. The flexible hinge comprises a first clamping jaw and a second clamping jaw. And the first clamping jaw and the second clamping jaw provide rotating force for the screw rod under the action of the piezoelectric ceramics. And the pre-tightening springs are used for applying pre-tightening force between the first clamping jaw and the screw rod and between the second clamping jaw and the screw rod. The threaded pipe is used for supporting the threaded rod and being connected with an external mechanism. According to the utility model, the piezoelectric ceramic is adopted for driving and the flexible hinge is combined, so that precise linear motion control is realized, and the touch-free adjusting device has the characteristics of high resolution, high precision and compact structure, and realizes touch-free adjustment of the optical adjusting bracket which is difficult to touch. A plurality of linear motor type electric screws are combined for use, so that two-dimensional or three-dimensional motion control can be realized.

Description

Technical Field

[0001] This utility model belongs to the field of precision drive and positioning technology, and specifically relates to a linear motor type electric screw. Background Technology

[0002] Linear piezoelectric motors utilize the inverse piezoelectric effect of piezoelectric ceramics to generate frictional driving force between the driving foot and the friction plate, achieving linear motion and force output. Linear piezoelectric motors have broad application prospects in aerospace, robotics, and precision optical instruments. In optical instruments, linear piezoelectric motors can adjust components (lenses, filters, mirrors, light sources) in horizontal and vertical directions within an optical system to position the component relative to the optical axis of the system. Existing linear piezoelectric motors suffer from low repeatability, poor reliability, large size, and inconvenient installation.

[0003] Based on the above, the current problem to be solved is to provide a linear motor-driven electric screw that is highly accurate, reliable, compact in structure, and easy to install. Utility Model Content

[0004] The purpose of this invention is to provide a linear motor-type electric screw, which aims to solve the problems of low repeatability, poor reliability, low output force, and complex structure of piezoelectric phase shifters in the prior art.

[0005] This utility model is implemented as follows: a linear motor type piezoelectric screw includes a screw rod, which sequentially passes through a housing, a drive mechanism, a mechanism seat, and a threaded tube;

[0006] The outer shell is disposed on the mechanism seat, and the drive mechanism is disposed in the cavity formed by the outer shell and the mechanism seat; the drive mechanism includes a flexible hinge, piezoelectric ceramic and a preload spring;

[0007] One end of the flexible hinge is connected to the mechanism seat; the flexible hinge includes a first jaw and a second jaw; the first jaw and the second jaw are respectively provided with internal threads corresponding to the external threads of the screw, the first jaw and the second jaw cooperate with each other to clamp the screw, and the first jaw and the second jaw provide rotational force to the screw under the action of the piezoelectric ceramic; a preload spring is provided on the outer periphery of the flexible hinge to apply preload force between the first jaw and the screw, and between the second jaw and the screw;

[0008] The threaded tube is connected to the side of the mechanism seat away from the outer casing. The threaded tube has an internal thread that matches the external thread of the screw. The threaded tube is used to support the screw and connect to the external mechanism.

[0009] Furthermore, the top of the screw near the threaded tube is provided with ball bearings.

[0010] Furthermore, a stop nut is also fitted onto the screw, which is located between the threaded tube and the top of the screw, and is used to limit the movement stroke of the screw.

[0011] Furthermore, a locking nut is fitted on the side of the threaded tube away from the mechanism seat. The threaded tube and the locking nut are connected by external and internal threads. The locking nut is used to lock the connection part of the external mechanism to the threaded tube.

[0012] Furthermore, the threaded tube has an annular protrusion on the side near the mechanism seat, and the annular protrusion and the locking nut lock the connection part of the external mechanism to the threaded tube.

[0013] Furthermore, a wire clamp is provided on the side of the mechanism base away from the driving mechanism, and the wire clamp and the mechanism base are respectively provided with through holes. The through holes are used for the power supply wire of the piezoelectric ceramic to be electrically connected to the external mechanism through the wire clamp.

[0014] The advantages of the linear motor-type electric screw provided by this utility model are as follows:

[0015] This invention employs piezoelectric ceramic drive and a flexible hinge structure design to enable screw rotation and propulsion, achieving precise linear motion control. It features high resolution, high accuracy, and a compact structure, allowing for touchless adjustment of hard-to-reach optical adjustment frames. Multiple linear motor-type electric screws combined with a slide table enable two-dimensional or three-dimensional motion control of the motion platform.

[0016] This invention uses a shell and mechanism seat to encapsulate the drive mechanism, providing excellent protection for the piezoelectric ceramic and flexible hinge, ensuring product lifespan, and featuring a reasonable and compact structure. The preload spring adds preload force between the first jaw and the screw, and between the second jaw and the screw, ensuring the frictional driving force for screw rotation, thereby guaranteeing operational stability.

[0017] The threaded tube of this invention supports the screw, making its operation more stable, reliable, and precise. The outer circumference of the threaded tube is used for connection with external mechanisms. A locking nut is provided on the threaded tube; the combination of the threaded tube and the locking nut makes the connection with external mechanisms simple and stable, occupies little space, and is easy to install and operate. A stop nut is provided on the screw, which can be positioned at any position between the top of the threaded tube and the top of the screw rod according to the stroke requirements, used to limit the linear movement distance of the screw rod for precise control. A ball bearing is provided at the top of the screw rod, which reduces contact friction during the movement of the screw rod driving the external mechanism, ensuring service life and accuracy. This invention also includes a wire clamp, with a reasonable and compact structure that effectively protects and stores the power supply cable. Attached Figure Description

[0018] Figure 1 A three-dimensional structural diagram of the linear motor-type electric screw provided by this utility model;

[0019] Figure 2 Partial exploded view of the linear motor-type electric screw provided by this utility model;

[0020] Figure 3 The front view of the linear motor-type electric screw provided by this utility model;

[0021] Figure 4 The utility model provides Figure 3 A cross-sectional view of a linear motor-type electric screw along the AA direction;

[0022] Figure 5 The utility model provides Figure 3 A cross-sectional view of a linear motor-type electric screw along the BB direction;

[0023] Figure 6 A three-dimensional structural diagram of the driving mechanism provided by this utility model;

[0024] Figure 7 Left view of the drive mechanism provided by this utility model;

[0025] Figure 8 The front view of the threaded pipe provided by this utility model;

[0026] Figure 9 A three-dimensional structural diagram of the preload spring provided by this utility model;

[0027] Figure 10 A three-dimensional structural diagram of the wire clamp provided by this utility model;

[0028] In the diagram: 1-Screw; 2-Housing shell; 3-Drive mechanism; 31-Flexible hinge; 311-First gripper; 312-Second gripper; 32-Piezoelectric ceramic; 33-Preload spring; 4-Mechanism seat; 5-Threaded tube; 51-Annular protrusion; 6-Ball; 7-Stop nut; 8-Locking nut; 9-Wire clamp; 91-Through hole. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0030] The implementation of this utility model will be described in detail below with reference to specific embodiments.

[0031] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0032] Reference Figure 1-10 The image shown is a preferred embodiment of the present invention.

[0033] The piezoelectric screw includes a screw 1, a housing 2, a drive mechanism 3, a mechanism seat 4, and a threaded tube 5. The screw 1 has external threads and passes sequentially through the housing 2, drive mechanism 3, mechanism seat 4, and threaded tube 5, as shown in the reference diagram. Figure 1-2 The outer casing 2 is mounted on the mechanism base 4, and the outer casing 2 and the mechanism base 4 form a cavity, within which the drive mechanism 3 is housed. The outer casing 2 and the mechanism base 4 encapsulate and protect the drive mechanism 3. The drive mechanism 3 includes a flexible hinge 31, a piezoelectric ceramic 32, and a preload spring 33, as shown in the reference. Figure 3-5 The end of the flexible hinge 31 away from the screw 1 is connected to the mechanism seat 4, that is, the flexible hinge 31 can be fixed to the mechanism seat 4 by bolts.

[0034] The flexible hinge 31 includes a first jaw 311 and a second jaw 312. The clamping surfaces of the first jaw 311 and the second jaw 312 are respectively provided with internal threads corresponding to the external threads of the screw 1. The first jaw 311 and the second jaw 312 cooperate to clamp the screw 1. A cavity structure is provided on the side of the first jaw 311 and the second jaw 312 away from the screw 1. A piezoelectric ceramic 32 is disposed within the cavity structure, and both ends of the piezoelectric ceramic 32 are connected to the first jaw 311 and the second jaw 312, respectively. When a voltage is applied, the piezoelectric ceramic 32 deforms, and the elongated piezoelectric ceramic 32 presses against the first jaw 311 and the second jaw 312. The first jaw 311 and the second jaw 312 move tangentially along the external thread surface of the screw 1, with opposite tangential directions, thereby generating a rotational force on the screw 1, causing the screw 1 to rotate and move forward. This invention uses piezoelectric ceramic 32 for driving and designs the structure of flexible hinge 31 to achieve precise linear motion, and features high resolution, high accuracy and compact structure.

[0035] The flexible hinge 31 is also provided with a preload spring 33 on its outer periphery, as shown in the reference. Figure 6 , Figure 7 and Figure 9 The preload spring 33 has an open-loop irregular structure. The preload spring 33 clamps the outer sides of the first jaw 311 and the second jaw 312, that is, it applies a preload force between the first jaw 311 and the screw 1, and between the second jaw 312 and the screw 1, thereby increasing the friction between the first jaw 311 and the screw 1, and between the second jaw 312 and the screw 1, and thus ensuring the stability of operation.

[0036] The threaded tube 5 is connected to the side of the mechanism seat 4 away from the outer casing 2, meaning the threaded tube 5 and the mechanism seat 4 can be connected by bolts. The threaded tube 5 has an internal thread that matches the external thread of the screw 1. The screw 1 can rotate forward and backward along the threaded tube 5. The threaded tube 5 serves two purposes: supporting the screw 1 and fixing it to an external mechanism. Preferably, a locking nut 8 for positioning and installation with the external mechanism is fitted on the side of the threaded tube 5 away from the mechanism seat 4. Specifically, the side of the threaded tube 5 away from the mechanism seat 4 has an external thread, and the locking nut 8 has a corresponding internal thread. The locking nut 8 and the threaded tube 5 lock the connection part of the external mechanism to the middle of the threaded tube 5 through the internal and external threads. Furthermore, the side of the threaded tube 5 near the mechanism seat 4 has an annular protrusion 51, which, together with the locking nut 8, locks the connection part of the external mechanism to the middle of the threaded tube 5. The combined structure of the threaded tube 5 and the locking nut 8 makes the connection between the present invention and the external mechanism simple and stable, occupies little space, and is easy to install and operate.

[0037] A stop nut 7 is also fitted onto the screw 1. The stop nut 7 is located between the threaded tube 5 and the top (motion output end) of the screw 1, and is used to limit the stroke of the screw 1 to achieve precise control. The end of the screw 1 near the threaded tube 5 is used to drive the movement of an external mechanism, such as in the application of an optical adjustment frame to adjust the vertical or horizontal position. Preferably, a ball bearing 6 is provided at the top of the screw 1 to reduce contact friction and ensure service life and accuracy.

[0038] A wire clamp 9 is provided on the side of the mechanism base 4 away from the drive mechanism 3, as shown in the reference. Figure 10 The mechanism base 4 and the corresponding wire clamp 9 are provided with through holes 91. The through holes 91 connect the cavity between the outer shell 2 and the mechanism base 4 with the wire clamp 9, thereby allowing the power supply wire of the piezoelectric ceramic 32 to be electrically connected to the external mechanism through the through holes 91 and the wire clamp 9. The structure is reasonable and compact, and it effectively protects and stores the power supply wire.

[0039] This invention is not intended to limit the scope of this invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention shall be included within the protection scope of this invention.

Claims

1. A linear motor-driven piezoelectric screw, characterized in that, It includes a screw (1), which passes through the outer shell (2), the drive mechanism (3), the mechanism seat (4) and the threaded tube (5) in sequence; The outer shell (2) is disposed on the mechanism seat (4), and the driving mechanism (3) is disposed in the cavity formed by the outer shell (2) and the mechanism seat (4); the driving mechanism (3) includes a flexible hinge (31), a piezoelectric ceramic (32) and a preload spring (33). One end of the flexible hinge (31) is connected to the mechanism seat (4); the flexible hinge (31) includes a first jaw (311) and a second jaw (312); the first jaw (311) and the second jaw (312) are respectively provided with internal threads corresponding to the external threads of the screw (1), the first jaw (311) and the second jaw (312) cooperate with each other to clamp the screw (1), the first jaw (311) and the second jaw (312) provide the screw (1) with rotational force under the action of the piezoelectric ceramic (32); the preload spring (33) is provided on the outer periphery of the flexible hinge (31) and is used to apply preload force between the first jaw (311) and the screw (1) and between the second jaw (312) and the screw (1); The threaded tube (5) is connected to the side of the mechanism seat (4) away from the outer shell (2). The threaded tube (5) is provided with an internal thread that matches the external thread of the screw (1). The threaded tube (5) is used to support the screw (1) and connect to the external mechanism.

2. The linear motor-type piezoelectric screw according to claim 1, characterized in that, The top of the screw (1) near the threaded tube (5) is provided with a ball (6).

3. The linear motor-type piezoelectric screw according to claim 1, characterized in that, A stop nut (7) is also fitted on the screw (1). The stop nut (7) is located between the threaded tube (5) and the top of the screw (1) and is used to limit the movement stroke of the screw (1).

4. The linear motor-type piezoelectric screw according to claim 1, characterized in that, A locking nut (8) is fitted on the side of the threaded tube (5) away from the mechanism seat (4). The threaded tube (5) and the locking nut (8) are connected by external and internal threads. The locking nut (8) is used to lock the connection part of the external mechanism to the threaded tube (5).

5. The linear motor-type piezoelectric screw according to claim 4, characterized in that, The threaded tube (5) has an annular protrusion (51) on the side near the mechanism seat (4). The annular protrusion (51) and the locking nut (8) lock the connection part of the external mechanism to the threaded tube (5).

6. The linear motor-type piezoelectric screw according to claim 1, characterized in that, The mechanism base (4) is provided with a wire clamp (9) on the side away from the drive mechanism (3). The wire clamp (9) and the mechanism base (4) are respectively provided with through holes (91). The through holes (91) are used for the power supply line of the piezoelectric ceramic (32) to be electrically connected to the external mechanism through the wire clamp (9).

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