Piezoelectric ceramic driving three-dimensional positioning table

Abstract

The utility model discloses a three-dimensional positioning table driven by piezoelectric ceramics, which comprises a motion platform, an alignment piece and a positioning piece, and is characterized in that a flexible hinge platform generates an ideal space three-dimensional elliptical track by applying control signals to a piezoelectric stack I, a piezoelectric stack II and a piezoelectric stack III in a driving manner and adjusting parameters of the signals applied by the piezoelectric stacks; when the moving platform needs to be positioned, a telescopic rod is driven by an air cylinder to stretch out and draw back, so that a positioning block is driven to do reciprocating motion, a positioning block of a positioning piece and an alignment groove of an alignment piece are aligned, and therefore the moving platform is positioned and locked, and a certain supporting effect is achieved on the moving platform through the positioning piece; the positioning block is driven by the air cylinder to move in a reciprocating mode, when the moving platform does not need to be supported, the positioning block can retract to the position below the moving platform, and the situation that the positioning piece and the alignment piece interfere with normal work of the moving platform is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of ultra-precision cutting and processing and processing of complex optical parts made of difficult-to-process materials, and in particular to a piezoelectric ceramic driven three-dimensional positioning table. Background Art

[0002] The basic principle of piezoelectric drive technology is based on the inverse piezoelectric effect of piezoelectric ceramic materials, which produces rotational or linear motion by controlling its mechanical deformation.

[0003] The existing Chinese patent with the authorization announcement number CN105252285B discloses a piezoelectric driven three-dimensional elliptical micro-feed motion platform, which belongs to the field of ultra-precision cutting and difficult-to-process material complex optical parts processing technology. There are two pairs of straight circular flexible hinges and two pairs of straight beam flexible hinges symmetrically distributed on both sides of the workpiece base and the outer ring of the workpiece base. The piezoelectric stacks in the X and Y axis directions are installed on the flexible hinge platform by pre-tightening screws through the piezoelectric stack pre-tightening holes, and the piezoelectric stacks in the Z axis direction are installed on the base through two wedge blocks. The initial height of the workpiece base in the Z axis direction is adjustable. The present invention uses a flexible hinge platform to complete the transmission of micro-displacement, minimizes the loss of precision in the process of micro-displacement transmission, and thus compensates for the shortcoming of the small feeding step of piezoelectric ceramics. The piezoelectric driven three-dimensional elliptical micro-feed motion platform has smooth movement, high resolution, and good rigidity.

[0004] The disadvantage of the above-mentioned prior art solution is that when processing a microcavity mold, it is necessary to press holes in the mold. The workpiece base does not have a supporting structure. When pressing holes is required, the part needs to be removed from the workpiece base and fixed again on the pressing workpiece position, which is inconvenient to operate. Utility Model Content

[0005] The purpose of the utility model is to provide a piezoelectric ceramic driven three-dimensional positioning table to solve the technical problem in the prior art that when processing a microcavity mold, it is necessary to press a hole in the mold, and the workpiece base is not provided with a supporting structure. When pressing a hole is required, the part needs to be removed from the workpiece base and fixed again on the punching workpiece position, which is inconvenient to operate.

[0006] The technical problem to be solved by the utility model can be achieved through the following technical solutions:

[0007] A piezoelectric ceramic driven three-dimensional positioning platform, comprising:

[0008] A motion platform comprises a workpiece base, wherein straight circular flexible hinges are symmetrically arranged on both sides of the workpiece base, a workpiece base outer ring is arranged on the outside of the workpiece base, the workpiece base is hinged to the workpiece base outer ring through the straight circular flexible hinge, straight beam type flexible hinges are symmetrically arranged on both sides of the workpiece base outer ring, a platform outer ring is arranged on the outside of the workpiece base outer ring, the workpiece base outer ring is hinged to the platform outer ring through the straight beam type flexible hinge, a piezoelectric stack 2 and a piezoelectric stack 3 are arranged on the workpiece base, a piezoelectric stack 1 is arranged on the workpiece base outer ring, and the piezoelectric stack 1, the piezoelectric stack 2 and the piezoelectric stack 3 are arranged perpendicular to each other;

[0009] The positioning member comprises a cylinder, a driving end of the cylinder is fixedly connected to a telescopic rod, and a positioning block is fixedly connected to the telescopic rod;

[0010] A plurality of alignment parts are symmetrically arranged on the ground of the workpiece base. The alignment parts include an alignment part body, on which an alignment groove is provided. The alignment groove corresponds to the positioning block in a vertical position.

[0011] As a further solution of the utility model: straight circular flexible hinge 1, straight circular flexible hinge 2, straight circular flexible hinge 3 and straight circular flexible hinge 4 are symmetrically arranged on both sides of the workpiece base, and the workpiece base is hinged to the outer ring of the workpiece base through straight circular flexible hinge 1, straight circular flexible hinge 2, straight circular flexible hinge 3 and straight circular flexible hinge 4.

[0012] As a further solution of the utility model: straight beam type flexible hinge 1, straight beam type flexible hinge 2, straight beam type flexible hinge 3, and straight beam type flexible hinge 4 are symmetrically arranged on both sides of the outer ring of the workpiece base, and the outer ring of the workpiece base is hinged to the outer ring of the platform through straight beam type flexible hinge 1, straight beam type flexible hinge 2, straight beam type flexible hinge 3, and straight beam type flexible hinge 4.

[0013] As a further solution of the utility model: support plates are symmetrically arranged and fixedly connected on both sides of the bottom surface of the outer ring of the platform, the lower end of the support plate is fixedly connected to the bottom plate, and the cylinder is fixedly connected to the bottom plate.

[0014] As a further solution of the utility model: piezoelectric stack three is pre-tightened and installed on the bottom plate, piezoelectric stack one is pre-tightened and installed on the outer ring of the platform, and piezoelectric stack two is pre-tightened and installed on the outer ring of the workpiece base.

[0015] As a further solution of the utility model: the positioning members and the alignment members correspond in number.

[0016] Beneficial effects of the utility model:

[0017] 1. The utility model applies control signals to the piezoelectric stack 1, the piezoelectric stack 2 and the piezoelectric stack 3, and adjusts the parameters of the piezoelectric stack applied signals, so that the workpiece base generates an ideal three-dimensional elliptical trajectory in space, and performs laser processing. When the motion platform needs to be positioned, the telescopic rod is driven by the cylinder to extend and retract, thereby driving the positioning block to move back and forth, and the positioning block of the positioning member is aligned with the alignment groove of the alignment member to position and lock the motion platform. The positioning member provides a certain support to the motion platform, so that the device can not only perform cutting processing but also drilling processing;

[0018] 2. The utility model drives the positioning block to move back and forth through the cylinder. When the motion platform does not need to be supported, the positioning block can be retracted to the bottom of the motion platform to prevent the positioning member and the alignment member from interfering with the normal work of the motion platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model Figure 1 ;

[0021] Figure 2 This is a schematic diagram of the structure of the sports platform of the utility model;

[0022] Figure 3 This is a schematic diagram of the three-dimensional structure of the utility model Figure 2 ;

[0023] Figure 4 It is a front view of the utility model.

[0024] In the figure: 1. motion platform; 11. workpiece base; 12a. straight circular flexible hinge one; 12b. straight circular flexible hinge two; 12c. straight circular flexible hinge three; 12d. straight circular flexible hinge four; 13. outer ring of workpiece base; 14a. straight beam type flexible hinge one; 14b. straight beam type flexible hinge two; 14c. straight beam type flexible hinge three; 14d. straight beam type flexible hinge four; 15. platform outer ring; 16. piezoelectric stack one; 17. piezoelectric stack two; 18. piezoelectric stack three; 2. alignment member; 21. alignment member body; 22. alignment groove; 3. positioning member; 31. cylinder; 32. telescopic rod; 33. positioning block; 4. support plate; 5. bottom plate. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] like Figure 1-Figure 4 As shown, a piezoelectric ceramic driven three-dimensional positioning platform comprises:

[0027] The motion platform 1 includes a workpiece base 11, and a straight circular flexible hinge 1 12a, a straight circular flexible hinge 12b, a straight circular flexible hinge 12c, and a straight circular flexible hinge 12d are symmetrically arranged on both sides of the workpiece base 11. A workpiece base outer ring 13 is arranged on the outside of the workpiece base 11. The workpiece base 11 is hinged to the workpiece base outer ring 13 through the straight circular flexible hinge 1 12a, the straight circular flexible hinge 12b, the straight circular flexible hinge 12c, and the straight circular flexible hinge 12d. A straight beam type flexible hinge 14a, a straight beam type flexible hinge 14d are symmetrically arranged on both sides of the workpiece base outer ring 13. Hinge 2 14b and straight beam type flexible hinge 3 14c, straight beam type flexible hinge 4 14d, a platform outer ring 15 is arranged outside the workpiece base outer ring 13, the workpiece base outer ring 13 is hinged with the platform outer ring 15 through straight beam type flexible hinge 1 14a, straight beam type flexible hinge 2 14b, straight beam type flexible hinge 3 14c and straight beam type flexible hinge 4 14d, piezoelectric stack 2 17 and piezoelectric stack 3 18 are arranged on the workpiece base 11, piezoelectric stack 1 16 is arranged on the workpiece base outer ring 13, and piezoelectric stack 1 16, piezoelectric stack 2 17 and piezoelectric stack 3 18 are arranged perpendicular to each other;

[0028] A piezoelectric ceramic driven three-dimensional positioning platform also includes: an alignment member 2 and a positioning member 3, the positioning member 3 includes a cylinder 31, the driving end of the cylinder 31 is fixedly connected to a telescopic rod 32, and the telescopic rod 32 is fixedly connected to a positioning block 33. Several alignment members 2 are symmetrically arranged on the ground of a workpiece base 11, and the alignment member 2 includes an alignment member body 21, and the alignment member body 21 is provided with an alignment groove 22, and the alignment groove 22 corresponds to the positioning block 33 in vertical position.

[0029] Support plates 4 are symmetrically arranged and fixedly connected on both sides of the bottom surface of the platform outer ring 15, the lower end of the support plate 4 is fixedly connected to the bottom plate 5, the cylinder 31 is fixedly connected to the bottom plate 5, the piezoelectric stack three 18 is pre-tightened and installed on the bottom plate 5, the piezoelectric stack one 16 is pre-tightened and installed on the platform outer ring 15, and the piezoelectric stack two 17 is pre-tightened and installed on the outer ring 13 of the workpiece base.

[0030] In some specific embodiments, the positioning members 3 correspond to the alignment members 2 in number.

[0031] In order to facilitate the understanding of the embodiments of this solution by those skilled in the art, the working principle of this solution is briefly described in combination with specific application scenarios:

[0032] The workpiece to be processed is fixed on the workpiece base 11, and the piezoelectric stack 1 16, the piezoelectric stack 2 17 and the piezoelectric stack 3 18 are driven to apply control signals, and the parameters of the piezoelectric stack applied signals are adjusted to make the workpiece base 11 produce an ideal three-dimensional elliptical trajectory in space for laser processing. When it is necessary to position the motion platform 1, the telescopic rod 32 is driven to extend and retract by the cylinder 31, thereby driving the positioning block 33 to move back and forth, and the positioning block 33 of the positioning member 3 is aligned with the alignment groove 22 of the alignment member 2, so that the motion platform 1 is positioned and locked. The positioning member 3 provides a certain support to the motion platform 1, so that the device can not only perform cutting processing but also punching processing;

[0033] The positioning block 33 is driven to move back and forth by the cylinder 31 . When the motion platform 1 does not need to be supported, the positioning block 33 can be retracted to the bottom of the motion platform 1 to prevent the positioning member 3 and the alignment member 2 from interfering with the normal operation of the motion platform 1 .

[0034] Several embodiments of the utility model are described in detail above, but the embodiments of the utility model are not limited thereto and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A piezoelectric ceramic driven three-dimensional positioning platform, comprising: A motion platform (1) comprises a workpiece base (11), wherein straight circular flexible hinges are symmetrically arranged on both sides of the workpiece base (11), a workpiece base outer ring (13) is arranged outside the workpiece base (11), the workpiece base (11) is hinged to the workpiece base outer ring (13) through the straight circular flexible hinges, straight beam type flexible hinges are symmetrically arranged on both sides of the workpiece base outer ring (13), a platform outer ring (15) is arranged outside the workpiece base outer ring (13), the workpiece base outer ring (13) is hinged to the platform outer ring (15) through the straight beam type flexible hinges, a piezoelectric stack 2 (17) and a piezoelectric stack 3 (18) are arranged on the workpiece base (11), a piezoelectric stack 1 (16) is arranged on the workpiece base outer ring (13), and the piezoelectric stack 1 (16), the piezoelectric stack 2 (17) and the piezoelectric stack 3 (18) are arranged perpendicular to each other; the motion platform (11) comprises a workpiece base (11), a piezoelectric stack 1 (16), a piezoelectric stack 2 (17) and a ... The positioning member (3) comprises a cylinder (31), a driving end of the cylinder (31) is fixedly connected to a telescopic rod (32), and a positioning block (33) is fixedly connected to the telescopic rod (32); A plurality of alignment members (2) are symmetrically arranged on the ground of a workpiece base (11), and the alignment members (2) include an alignment member body (21), and an alignment groove (22) is provided on the alignment member body (21), and the alignment groove (22) corresponds to the positioning block (33) in a vertical position.

2. The piezoelectric ceramic driven three-dimensional positioning platform according to claim 1, characterized in that: A straight circular flexible hinge 1 (12a), a straight circular flexible hinge 2 (12b), a straight circular flexible hinge 3 (12c), and a straight circular flexible hinge 4 (12d) are symmetrically arranged on both sides of the workpiece base (11), and the workpiece base (11) is hinged to the outer ring (13) of the workpiece base through the straight circular flexible hinge 1 (12a), the straight circular flexible hinge 2 (12b), the straight circular flexible hinge 3 (12c), and the straight circular flexible hinge 4 (12d).

3. The piezoelectric ceramic driven three-dimensional positioning platform according to claim 1, characterized in that: A straight beam type flexible hinge 1 (14a), a straight beam type flexible hinge 2 (14b), a straight beam type flexible hinge 3 (14c), and a straight beam type flexible hinge 4 (14d) are symmetrically arranged on both sides of the workpiece base outer ring (13), and the workpiece base outer ring (13) is hinged to the platform outer ring (15) through the straight beam type flexible hinge 1 (14a), the straight beam type flexible hinge 2 (14b), the straight beam type flexible hinge 3 (14c), and the straight beam type flexible hinge 4 (14d).

4. The piezoelectric ceramic driven three-dimensional positioning platform according to claim 1, characterized in that: Support plates (4) are symmetrically arranged and fixedly connected on both sides of the ground of the platform outer ring (15), the lower end of the support plate (4) is fixedly connected to a bottom plate (5), and the cylinder (31) is fixedly connected to the bottom plate (5).

5. The piezoelectric ceramic driven three-dimensional positioning platform according to claim 4, characterized in that: The piezoelectric stack three (18) is pre-tightened and installed on the bottom plate (5), the piezoelectric stack one (16) is pre-tightened and installed on the platform outer ring (15), and the piezoelectric stack two (17) is pre-tightened and installed on the workpiece base outer ring (13).

6. The piezoelectric ceramic driven three-dimensional positioning platform according to claim 1, characterized in that: The positioning members (3) correspond to the alignment members (2) in number.

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