Clamp for multilayer piezoelectric stack running-in test

Abstract

A clamp for a multilayer piezoelectric stack running-in test is characterized in that a plurality of through supporting holes are formed in the middle of a tool base, so that a supporting frame is fixed to the tool base; a plurality of through base fixing holes are formed in the periphery of the tool base, so that the tool base is fixed on a test platform; the bottom and the top of the support frame are respectively provided with a plurality of fixing holes, and the center of the support frame is provided with a hollow clamp area; the at least one clamping assembly comprises a pre-tightening elastic sheet and a ball head sleeve which are respectively arranged at the top of the support frame and the top of the clamp area and are used for fixing the piezoelectric stack; the pre-tightening elastic piece is provided with a plurality of fixing holes, and bolts penetrate through the fixing holes to achieve fixation; the ball head sleeve is arranged at the top of the clamp area, the two ends of the ball head sleeve abut against the bolt in the fixing hole of the supporting frame and the piezoelectric stack respectively, the working base can be freely fixed in a desired test environment according to requirements, the position of the supporting frame on the working base is fixed according to requirements, the structure is simple, and operation is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to piezoelectric ceramic device performance detection technical field, concretely relates to a kind of multilayer piezoelectric stack running-in test test fixture. BACKGROUND

[0002] Multilayer piezoelectric stack device is stacked and packaged by using inverse piezoelectric effect principle, micron thickness piezoelectric ceramic film sheet and inner electrode, is stacked layer by layer, displacement is generated by applying voltage to piezoelectric stack electrode, with small volume, fast response speed, low driving voltage, high displacement resolution, large output force, high energy conversion efficiency, low heating, simple control mode and other characteristics, has wide application in micro-mechanical manufacturing, ultra-precision machining, integrated circuit manufacturing, biological engineering, medical treatment, optical fiber butt joint, optical micro-processing system, aerospace, scanning probe microscope and other fields.

[0003] Multilayer piezoelectric stack preparation structure is relatively complex, in order to obtain larger deformation, need multilayer thick film stack. A multilayer stack often needs several thousand layers or even ten thousand layers of piezoelectric thick film to be co-fired. The service field of piezoelectric stack is generally microsystem and ultra-precision control system, and the uniformity and integrity of each layer of piezoelectric thick film will greatly affect the service life and reliability of the whole multilayer piezoelectric stack device. In order to avoid the failure and damage risk of multilayer piezoelectric stack in service process, it is necessary to carry out life test, and multilayer piezoelectric stack running-in test under specific environment is an important means to evaluate its use reliability. Since the raw material of multilayer piezoelectric stack is ceramic brittle material, the tensile strength and shear strength are low, and there is no fixed positioning structure itself, therefore, when carrying out running-in test on multilayer piezoelectric stack, in addition to loading a certain pre-tightening force on the test surface according to the demand, a suitable test fixture is also needed to assist positioning and fixing, so as to avoid other interference conditions from causing damage to the stack. SUMMARY

[0004] The utility model mainly aims at prior art problems, and proposes a kind of fixture of multilayer piezoelectric stack running-in test, not only can freely fix work base in the test environment wanted according to demand, and according to the position of support frame fixed in work base according to demand, simple structure, convenient operation.

[0005] The technical scheme of the utility model is as follows: a kind of fixture of multilayer piezoelectric stack running-in test, characterized by:

[0006] A tool base is provided with a plurality of support holes in the middle position, so that the support frame is fixed on the tool base;A plurality of base fixing holes are provided in the peripheral position, so that the tool base is fixed on the test platform;

[0007] At least one support frame is provided with a plurality of fixing holes at the bottom and the top respectively, and the center of the support frame is provided with a hollow clamp area.

[0008] At least one clamping assembly, including a pre-tightening spring and a ball head sleeve, is arranged at the top of the support frame and the top of the clamp area respectively, for fixing the piezoelectric stack;

[0009] The pre-tightening spring is provided with a plurality of fixing holes, and the bolts pass through the fixing holes to realize fixation;

[0010] The ball head sleeve is arranged at the top of the clamp area, and the two ends are respectively abutted with the bolt in the fixing hole of the support frame and the piezoelectric stack.

[0011] Further improvement: The support frame is in a back-shaped structure, the bottom beam and the top beam each have three fixing holes, and the middle fixing hole is a through hole, the position and the hole diameter are matched with the size and position of the support hole of the tool base, and the bolts pass through the three fixing holes of the bottom beam in turn to install and fasten the support frame on the tool base.

[0012] Further improvement: The diameter of the through hole is greater than the outer diameter of the fixing hole.

[0013] Further improvement: The height of the bottom beam of the support frame after being connected and fastened with the work base should be greater than the length of the bolt, so that after the fastening is completed, a round hole is formed at the middle through hole, which is consistent with the position of the through hole of the support frame, facilitating the positioning of the piezoelectric stack during installation.

[0014] Further improvement: The ball head sleeve is cut into a side plane on the left and right sides of the upper part, and the height is consistent with the height of the top beam of the support frame, the inside of the ball head sleeve is a fixing hole, the size is consistent with the support hole of the tool base and the fixing hole of the support frame, the ball head sleeve and the pre-tightening spring are fastened together by the bolt passing through the middle position of the support frame, and the ball head sleeve is pressed on the multi-layer piezoelectric stack through the through hole of the middle of the support frame.

[0015] Further improvement: The number of fixing holes of the support frame and the pre-tightening spring is the same and the positions are matched.

[0016] Finally: A plurality of support frames are arranged on the tool base in a horizontal row.

[0017] Compared with the prior art, the product has the advantages that: a plurality of base fixing holes are arranged on the work base, which facilitates the user to freely fix in different test environments, and the size of the support hole and the fixing hole is universal, which facilitates the user to fix the support frame on the work base, and uses universal bolts to complete the fixation and test, and the user can clamp between the bottom beam of the support frame and the ball head sleeve, which is simple in structure, convenient to operate and low in cost. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 Schematic diagram for installation of multi-layer piezoelectric stack height direction running test;

[0019] Fig. 2 It is the exploded structural schematic view of utility model work base, support frame, pre-tightening spring and ball head sleeve,

[0020] Fig. 3 It is the structural schematic view of utility model support frame,

[0021] In the figure, 1, tool base, 2, support hole, 3, base fixed hole, 4, support frame, 5, fixed hole, 6, fixture area, 7, clamping assembly, 8, pre-tightening spring, 9, ball head sleeve, 10, piezoelectric stack, 11, through hole,

[0022] 12, bolt. DETAILED DESCRIPTION

[0023] The utility model patent's implementation mode is further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the utility model patent, but cannot be used to limit the range of the utility model patent. In the description of the utility model patent, unless otherwise specified, the meaning of "multiple" is two or more than two;The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model patent and simplifying the description, and therefore cannot be understood as limiting the utility model patent to a particular orientation, configuration and operation. Therefore, it cannot be understood as limiting the utility model patent. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0024] In the description of the utility model patent, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected;It can be mechanically connected, or it can be electrically connected;It can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary skilled in the art, the specific meaning of the above terms in the utility model patent can be understood according to the specific circumstances.

[0025] The utility model is further described in detail below in combination with the drawings and examples.

[0026] According to Figs. 1 to 3The utility model relates to a kind of fixture of multilayer piezoelectric stack running-in test test, and the utility model focuses on the following: a tool base 1, middle position is equipped with multiple through support holes 2, so that support frame 4 is fixed on tool base 1;Multiple base fixing holes 3 are arranged around, so that tool base 1 is fixed on test platform;At least one support frame 4, bottom and top are equipped with multiple fixing holes 5 respectively, the center of support frame 4 is equipped with hollow clamp area 6;At least one clamping assembly 7, including pre-tightening spring 8 and ball head sleeve 9, is respectively arranged in the top of support frame 4 and the top of clamp area 6, for fixing piezoelectric stack 10;Pre-tightening spring 8 is preferably Wang character and is equipped with multiple fixing holes 5, bolt 12 passes through fixing hole 5 to realize fixation;Ball head sleeve 9 is arranged in the top of clamp area 6, and the two ends are respectively with bolt 12 in the fixing hole 5 of support frame 4 and piezoelectric stack 10, and the upper end of ball head sleeve should be abutted with pre-tightening spring by bolt connection.

[0027] Tool base 1 is distributed with multiple groups of support frames 4 in transverse row mode, support frame 4 is back-shaped structure, and the bottom crossbeam and the top crossbeam have three fixing holes 5 respectively, wherein the middle fixing hole is through hole 11, the size and position are matched with the size and position of support hole 2 of tool base 1, and bolt 12 is sequentially passed through the three fixing holes 5 of bottom crossbeam to install and fasten support frame 4 on tool base 1, to avoid that support frame 4 is inclined due to long time running-in stack vibration.The diameter of through hole 11 is greater than the outer diameter of fixing hole 5, to facilitate fixation.The height of bottom crossbeam of support frame 4 should be greater than the length of bolt 12 after being connected and fastened with tool base 1, so that a circular hole can be formed in the middle through hole 11 after fastening, which is consistent with the position of through hole 11 of support frame 4, to facilitate positioning when piezoelectric stack 10 is installed.The number of fixing holes 5 of support frame 4 and pre-tightening spring 8 is same and the positions are matched, the fixing hole 5 is preferably three, and the diameters of fixing hole 5 and support hole 2 are kept consistent, to facilitate installation.

[0028] Ball head sleeve 9 is cut out a side plane on the left and right sides of upper portion, and the height is consistent with the height of top crossbeam of support frame 4, the inside of ball head sleeve 9 is fixed hole 5, the size is consistent with the size of support hole 2 of tool base 1 and the size of fixing hole 5 of support frame 4, bolt 12 passing through pre-tightening spring 8 and the middle position of support frame 4 fastens ball head sleeve 9, pre-tightening spring 8 together, and ball head sleeve 9, pre-tightening spring 8 are pressed on multilayer piezoelectric stack 10 through the through hole 11 in the middle of support frame 4.

[0029] The height of ball head sleeve 9 in the embodiment should load 100N pre-tightening force, since 301H stainless steel is adopted, it is found after calculation that pre-tightening spring 8 is deformed 0.125mm to generate 100N elastic force, so the height of ball head sleeve 9 is support frame height 78mm-bottom crossbeam height 5mm-piezoelectric stack height 64.04mm+deformation amount 0.125mm=9.085mm.

[0030] The example does not carry out environmental test loading, so the tool base 1 is directly placed on the laboratory table, the ball head sleeve 9 is connected to the pre-tightening spring 8 through the top through hole 11 of the support frame 4 by the bolt 12, but the bolt 12 is not screwed in all; then the multilayer piezoelectric stack 10 is placed in the support frame 4 according to the bolt hole 12 in the middle of the ball head sleeve 9 and the bottom beam of the support frame 4 as a positioning point, after adjusting the position of the multilayer piezoelectric stack 10, the bolt 12 is screwed into the ball head sleeve 9, the installation is completed, and the test is carried out.

[0031] When the user needs to adjust the size of the pre-tightening load, only the multilayer piezoelectric stack 10 is removed from the support frame 4, the ball head sleeve 9 is rotated down from the pre-tightening spring 8, after replacing the ball head sleeve 9 of the required height, the piezoelectric stack 10 is reloaded into the support frame 4, the bolt 12 on the ball head sleeve 9 is tightened, and the test is carried out after fastening.

Claims

1. A fixture for a multi-layer piezoelectric stack burn-in test, characterized in that: a tool base is provided with a plurality of support holes in the middle position to fix a support frame on the tool base, and a plurality of base fixing holes around the periphery to fix the tool base on a test platform; at least one support frame is provided with a plurality of fixing holes at the bottom and top, respectively, and a hollow fixture area in the center of the support frame; at least one clamping assembly, including a pre-tightening spring and a ball head sleeve, is arranged at the top of the support frame and the top of the fixture area, respectively, for fixing the piezoelectric stack; the pre-tightening spring is provided with a plurality of fixing holes through which a bolt is passed to achieve fixation; the ball head sleeve is arranged at the top of the fixture area and abuts the bolt in the fixing hole of the support frame and the piezoelectric stack at both ends. The support frame has a back-shaped structure, and the bottom beam and the top beam each have three fixing holes, with the middle fixing hole being a through hole that matches the size and position of the support hole of the tool base in position and diameter, and the support frame is installed and fastened to the tool base by a bolt passing through the three fixing holes of the bottom beam in sequence. The through hole has a larger diameter than the outer diameter of the fixing hole. The height of the bottom beam of the support frame after being connected and fastened to the working base should be greater than the length of the bolt, so that after fastening is completed, a circular hole is formed at the middle through hole, which is consistent with the position of the through hole of the support frame, facilitating positioning when the piezoelectric stack is installed. The ball head sleeve is cut into a side plane at the upper left and right sides, with a height consistent with the height of the top beam of the support frame, and the inside of the ball head sleeve is a fixing hole that is consistent in size with the support hole of the tool base and the fixing hole of the support frame. The ball head sleeve and the pre-tightening spring are fastened together by a bolt passing through the pre-tightening spring and the middle position of the support frame, and the ball head sleeve is pressed on the multi-layer piezoelectric stack through the through hole in the middle of the support frame. The support frame and the pre-tightening spring have the same number of fixing holes and matching positions.

2. A fixture for a burn-in test of a multi-layer piezoelectric stack according to claim 1, wherein The tool base is provided with a plurality of groups of support frames distributed in a horizontal row manner.

3. A fixture for a burn-in test of a multi-layer piezoelectric stack according to claim 2, wherein ​ 4. A fixture for a burn-in test of a multi-layer piezoelectric stack according to claim 3, wherein ​ 5. A fixture for a burn-in test of a multi-layer piezoelectric stack as recited in claim 1, wherein ​ 6. A fixture for a burn-in test of a multi-layer piezoelectric stack as recited in claim 1, wherein ​ 7. A fixture for a burn-in test of a multi-layer piezoelectric stack as recited in claim 1, wherein ​

Images