Piezoelectric ceramic tubular motor

Abstract

The invention discloses a piezoelectric ceramic tubular motor, and relates to the technical field of piezoelectric ceramic motors, the piezoelectric ceramic tubular motor comprises a piezoelectric ceramic tube body, a first hollow stator and a second hollow stator, the lower part of the piezoelectric ceramic tube body is fixedly connected with the first hollow stator in a gluing manner, and the middle part of the first hollow stator is provided with a first through hole; and the upper portion of the piezoelectric ceramic tube body is fixedly connected with a second hollow stator in a gluing mode, a second through hole is formed in the middle of the second hollow stator, the lower portion of the first hollow stator is integrally connected with the bottom end of a rotor, and the outer end of a screw rod is in threaded connection with a rectangular block. According to the piezoelectric ceramic tubular motor, the first hollow stator is integrally connected with the bottom end of the rotor, the rotating rod is only attached to the second through hole when rotating and does not make contact with the piezoelectric ceramic tube body and the first hollow stator, friction between the stator and the rotor is reduced, and the pre-tightening force between the stator and the rotor can be adjusted by selecting the slots of different heights.

Description

Technical Field

[0001] The present invention relates to the technical field of piezoelectric ceramic motors, in particular to a piezoelectric ceramic tubular motor. Background Art

[0002] Piezoelectric ceramic tubular motors can solve the shortcomings of traditional motors and servo motors, such as large size, high energy consumption, high heat generation and complex structure. Piezoelectric ceramic tubular motors are hollow tubular piezoelectric ceramics that use the d31 mode to increase torque for rotational drive, which can reduce production costs.

[0003] There are many piezoelectric ceramic tubular motors on the market, such as a piezoelectric ceramic tubular ultrasonic motor and a preparation method thereof disclosed in a Chinese invention patent with authorization announcement number CN116425540B, wherein the preparation method comprises the step of preparing a piezoelectric ceramic tube by injection molding, wherein the injection raw materials are mixed piezoelectric ceramic powder and a binder, and the binder is a mixture of 50%-60% paraffin, 20%-30% polypropylene, 10%-20% polyethylene and 5%-15% stearic acid in weight percentage. The present invention selects a suitable binder system to successfully obtain an ideal piezoelectric ceramic tube by injection molding, and further prepares a high-quality piezoelectric ceramic tubular ultrasonic motor, which has a driving frequency of 103-109KHz, a rotation speed of 800-1000r / min, and a life of >90 hours under a driving voltage of 45V;

[0004] However, the existing piezoelectric ceramic tube motors still have the following problems:

[0005] 1. When using a piezoelectric ceramic tube motor, the friction between the rotor and the stator is large, which affects the use;

[0006] 2. It is inconvenient to adjust the preload force between the stator and the rotor. Therefore, we propose a piezoelectric ceramic tube motor to solve the above problems. Summary of the invention

[0007] The purpose of the present invention is to provide a piezoelectric ceramic tube motor to solve the problem that the existing piezoelectric ceramic tube motor mentioned in the above background technology has large friction between the rotor and the stator during use, which affects the use and is inconvenient to adjust the preload force between the stator and the rotor.

[0008] To achieve the above object, the present invention provides the following technical solution: a piezoelectric ceramic tubular motor, comprising a piezoelectric ceramic tubular body, a first hollow stator and a second hollow stator:

[0009] A first hollow stator is fixedly connected to the bottom of the piezoelectric ceramic tube body by gluing, and a first through-hole is provided in the middle of the first hollow stator; a second hollow stator is fixedly connected to the top of the piezoelectric ceramic tube body by gluing, and a second through-hole is provided in the middle of the second hollow stator; a bottom end of a rotor is integrally connected to the bottom of the first hollow stator, and a placement groove is provided inside the bottom end of the rotor, and an annular groove is provided at the top and bottom ends of the placement groove; a turntable is provided inside the placement groove, and balls are installed at the top and bottom ends of the turntable; a rotating rod is integrally connected to the upper surface of the turntable, and slots are provided at equal intervals at one end of the rotating rod away from the turntable;

[0010] A spring is arranged above the second hollow stator, and a fixing mechanism is arranged above the spring. The fixing mechanism includes a clamping ring, a movable groove, a screw and a rectangular block. The left and right ends of the clamping ring are provided with movable grooves, and the outer end of the clamping ring is rotatably installed with a screw, and the outer end of the screw is threadedly connected with a rectangular block.

[0011] By adopting the above technical solution, the first hollow stator is integrally connected to the bottom end of the rotor. When the rotating rod rotates, it only fits with the second perforation and does not contact the piezoelectric ceramic tube body and the first hollow stator, thereby reducing the friction between the stator and the rotor. The preload force between the stator and the rotor can be adjusted by selecting slots of different heights.

[0012] As a preferred technical solution of the present invention, the inner wall of the second through hole fits with the outer side surface of the rotating rod.

[0013] By adopting the above technical solution, since the inner wall of the second through hole fits with the outer side surface of the rotating rod, the rotating rod can be restricted to prevent the rotating rod from tilting.

[0014] As a preferred technical solution of the present invention, the rotating rod passes through the first through hole and comes out of the second through hole, and the top end of the rotating rod passes through the spring.

[0015] By adopting the above technical solution, since the top end of the rotating rod penetrates into the spring, the spring is located outside the rotating rod, and the spring wraps the rotating rod.

[0016] As a preferred technical solution of the present invention, the diameter of the second through-hole is smaller than the diameter of the first through-hole.

[0017] By adopting the above technical solution, since the diameter of the second through hole is smaller than the diameter of the first through hole, the rotating rod does not contact the first through hole, thereby reducing friction.

[0018] As a preferred technical solution of the present invention, the balls are distributed on the turntable at equal angles, and the outer ends of the balls are located inside the annular groove.

[0019] By adopting the above technical solution, since the outer end of the ball is located inside the annular groove, the ball rotates inside the annular groove, which can reduce friction.

[0020] As a preferred technical solution of the present invention, the screw is symmetrically arranged about the center line of the retaining ring.

[0021] By adopting the above technical solution, since the screw is symmetrically arranged about the center line of the clamping ring, the screw is symmetrically arranged, which does not affect the balance of the piezoelectric ceramic tubular motor.

[0022] As a preferred technical solution of the present invention, a rectangular block is attached to the inner wall of the movable groove, and the rectangular block forms a sliding structure through a screw and a clamping ring.

[0023] By adopting the above technical solution, since the rectangular block forms a sliding structure through the screw rod and the clamping ring, it is easy to move the rectangular block.

[0024] As a preferred technical solution of the present invention, the rectangular block is connected to the rotating rod through a slot.

[0025] By adopting the above technical solution, since the rectangular block is connected to the rotating rod through the slot, it is convenient to disassemble and assemble the rectangular block and the rotating rod.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: the first hollow stator of the piezoelectric ceramic tube motor is integrally connected to the bottom end of the rotor, and when the rotating rod rotates, it only fits with the second perforation and does not contact the piezoelectric ceramic tube body and the first hollow stator, thereby reducing the friction between the stator and the rotor, and the preload force between the stator and the rotor can be adjusted by selecting slots of different heights;

[0027] 1. The first hollow stator is integrally connected to the bottom end of the rotor, and the rotating rod is rotatably installed inside the bottom end of the rotor through a rotating disk and a ball. When the rotating rod rotates, it only fits with the second perforation. The rotating rod is limited by the second perforation to prevent the rotating rod from being skewed. The rotating rod does not contact the piezoelectric ceramic tube body and the first hollow stator, thereby reducing friction;

[0028] The balls are distributed at equal angles on the turntable, and the outer ends of the balls are located inside the annular grooves. When the rotating rod rotates, the balls rotate inside the annular grooves, reducing contact and thus reducing friction.

[0029] 2. Both the first hollow stator and the second hollow stator use a hollow structure, which can reduce the weight of the piezoelectric ceramic tube motor;

[0030] 3. Slots are provided at equal intervals on one end of the rotating rod away from the rotating disk. The rectangular block is connected to the rotating rod through the slots. The fixing mechanism composed of a clamping ring, a movable groove, a screw and a rectangular block is aligned with the selected slot. The clamping ring is limited by the fixing mechanism, and the spring is compressed. The preload force between the stator and the rotor can be adjusted by selecting slots of different heights.

[0031] Use a tool to insert the inside of the screw and manually rotate the screw to move the rectangular block, adjust the connection between the rectangular block and the slot, facilitate the disassembly and assembly of the clamping ring and the rotating rod, and facilitate the adjustment of the preload force between the stator and the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the shaft side structure of the present invention;

[0033] Figure 2 It is a schematic diagram of the axial side section structure of the present invention;

[0034] Figure 3 For the present invention Figure 2 The enlarged structural diagram at A in the middle;

[0035] Figure 4 This is a schematic diagram of the connection structure between the ball and the rotating disk of the present invention;

[0036] Figure 5 This is a schematic diagram of the cross-sectional structure of the bottom end of the rotor of the present invention;

[0037] Figure 6 This is a schematic diagram of the cutaway structure of the clamp ring of the present invention;

[0038] Figure 7 It is a schematic diagram of the split structure of the present invention;

[0039] Figure 8 It is a schematic diagram of the axial structure of the piezoelectric ceramic tube body of the present invention.

[0040] In the figure: 1, piezoelectric ceramic tube body; 2, first hollow stator; 3, first through hole; 4, second hollow stator; 5, second through hole; 6, bottom end of rotor; 7, mounting groove; 8, annular groove; 9, turntable; 10, ball bearing; 11, rotating rod; 12, slot; 13, spring; 14, retaining ring; 15, movable groove; 16, screw; 17, rectangular block. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] Example 1: Please refer to Figure 1 , Figure 2 , Figure 5 , Figure 7 and Figure 8, the existing piezoelectric ceramic tube motor, when in use, has a large friction between the rotor and the stator, which affects the use. In order to solve this technical problem, this embodiment discloses the following technical contents;

[0043] A piezoelectric ceramic tubular motor comprises a piezoelectric ceramic tube body 1, a first hollow stator 2 and a second hollow stator 4, wherein the first hollow stator 2 is fixedly connected to the bottom of the piezoelectric ceramic tube body 1 by gluing, and a first through hole 3 is provided in the middle of the first hollow stator 2, the second hollow stator 4 is fixedly connected to the top of the piezoelectric ceramic tube body 1 by gluing, and a second through hole 5 is provided in the middle of the second hollow stator 4, a rotor bottom end 6 is integrally connected to the bottom of the first hollow stator 2, and a placement groove 7 is provided inside the rotor bottom end 6, and an annular groove 8 is provided at the top and bottom of the placement groove 7, a turntable 9 is provided inside the placement groove 7, and balls 10 are installed at the top and bottom of the turntable 9, and a rotating rod 11 is integrally connected to the upper surface of the turntable 9;

[0044] A spring 13 is disposed above the second hollow stator 4, and a fixing mechanism is disposed above the spring 13;

[0045] When assembled, the piezoelectric ceramic tube body 1 and the first hollow stator 2 and the second hollow stator 4 and the piezoelectric ceramic tube body 1 are fixed by glue, the rotating rod 11 passes through the first through hole 3, the second through hole 5 and the spring 13, and the spring 13 is limited by the fixing mechanism;

[0046] When the rotating rod 11 rotates, the rotating disk 9 rotates inside the receiving groove 7, and the ball 10 rotates inside the annular groove 8. The connection between the ball 10 and the annular groove 8 reduces the contact, thereby reducing the friction. The first through hole 3 does not contact the rotating rod 11, and only the second through hole 5 fits the outer side of the rotating rod 11, further reducing the friction.

[0047] Embodiment 2: The technical content disclosed in this embodiment is a further improvement on the above embodiment 1. The existing piezoelectric ceramic tube motor is not convenient for adjusting the preload force between the stator and the rotor. In order to solve this technical problem, this embodiment discloses the following technical content. Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 and Figure 8 ;

[0048] The end of the rotating rod 11 away from the rotating disk 9 is provided with slots 12 at equal intervals, and the fixing mechanism includes a snap ring 14, a movable slot 15, a screw rod 16 and a rectangular block 17. The movable slots 15 are provided at both ends of the snap ring 14, and the outer end of the snap ring 14 is rotatably mounted with a screw rod 16, and the outer end of the screw rod 16 is threadedly connected with a rectangular block 17, and the screw rod 16 is symmetrically arranged about the center line of the snap ring 14, and the inner wall of the movable slot 15 is attached with a rectangular block 17, and the rectangular block 17 forms a sliding structure with the snap ring 14 through the screw rod 16, and the rectangular block 17 is connected to the rotating rod 11 through the slot 12;

[0049] Select a slot 12 of appropriate height on the rotating rod 11 as needed, move the snap ring 14 to the outside of the selected slot 12, insert the tool into the rectangular slot at the outer end of the screw 16, and then rotate the screw 16, so that the rectangular block 17 threadedly connected to the screw 16 slides inside the movable slot 15, so that the rectangular block 17 is stuck in the slot 12, and the snap ring 14 and the rotating rod 11 are fixed by the left and right two groups of rectangular blocks 17, thereby compressing the spring 13, adjusting the compression degree of the spring 13, and adjusting the preload between the stator and the rotor;

[0050] The above completes a series of operations of the piezoelectric ceramic tubular motor. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0051] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the instructions and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0052] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A piezoelectric ceramic tubular motor, comprising a piezoelectric ceramic tubular body (1), a first hollow stator (2) and a second hollow stator (4), characterized in that: The piezoelectric ceramic tube body (1) is fixedly connected to a first hollow stator (2) by gluing at the bottom, and a first through hole (3) is provided in the middle of the first hollow stator (2); the piezoelectric ceramic tube body (1) is fixedly connected to a second hollow stator (4) by gluing at the top, and a second through hole (5) is provided in the middle of the second hollow stator (4); the first hollow stator (2) is integrally connected to a rotor bottom end (6) at the bottom, and a placement groove (7) is provided inside the rotor bottom end (6), and an annular groove (8) is provided at the top and bottom of the placement groove (7); a turntable (9) is provided inside the placement groove (7), and balls (10) are installed at the top and bottom of the turntable (9); a rotating rod (11) is integrally connected to the upper surface of the turntable (9), and slots (12) are provided at equal intervals at one end of the rotating rod (11) away from the turntable (9); A spring (13) is arranged above the second hollow stator (4), and a fixing mechanism is arranged above the spring (13). The fixing mechanism comprises a clamping ring (14), a movable groove (15), a screw rod (16) and a rectangular block (17). The left and right ends of the clamping ring (14) are provided with movable grooves (15), and the outer end of the clamping ring (14) is rotatably mounted with a screw rod (16), and the outer end of the screw rod (16) is threadedly connected with the rectangular block (17).

2. The piezoelectric ceramic tubular motor according to claim 1, characterized in that: The inner wall of the second through hole (5) fits the outer side surface of the rotating rod (11).

3. The piezoelectric ceramic tubular motor according to claim 1, characterized in that: The rotating rod (11) passes through the first through hole (3) and passes through the second through hole (5), and the top end of the rotating rod (11) passes through the spring (13).

4. The piezoelectric ceramic tubular motor according to claim 1, characterized in that: The diameter of the second through hole (5) is smaller than the diameter of the first through hole (3).

5. The piezoelectric ceramic tubular motor according to claim 1, characterized in that: The balls (10) are distributed at equal angles on the rotating disk (9), and the outer ends of the balls (10) are located inside the annular groove (8).

6. The piezoelectric ceramic tubular motor according to claim 1, characterized in that: The screw (16) is symmetrically arranged with respect to the center line of the clamping ring (14).

7. The piezoelectric ceramic tubular motor according to claim 1, characterized in that: A rectangular block (17) is attached to the inner wall of the movable groove (15), and the rectangular block (17) forms a sliding structure through a screw rod (16) and a clamping ring (14).

8. The piezoelectric ceramic tubular motor according to claim 1, characterized in that: The rectangular block (17) is connected to the rotating rod (11) via a slot (12).

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