Piezoelectrically driven force and displacement integrated high-precision testing platform and method

Abstract

The present invention provides a piezoelectric-driven integrated force and displacement high-precision testing platform and method, including: the two ends of the top clamping beam 1 are respectively fixedly connected to the piezoelectric threaded linear motor 5; the sensor 2 passes through the top clamping beam 1 and contacts the linear actuator 4 for measurement; the measurement posture is adjusted by the piezoelectric threaded linear motor 5 through synchronous up and down high-precision movement; the linear actuator 4 is placed on the centering clamping mechanism 7, and the middle clamping mechanism 7 is connected to the guide rail; the guide rail is connected to the piezoelectric rotary motor 10 and fixed on the bottom adapter plate 14; the piezoelectric rotary motor 10 drives the connecting rod to drive the guide rail and then drives the middle clamping mechanism 7 to achieve centering clamping of the linear actuator 4; the linear actuator 4 is powered on to carry out force / displacement measurement.

Description

Technical Field

[0001] The present invention relates to the field of motor testing technology, and in particular to a piezoelectrically driven force and displacement integrated high-precision testing platform and method. Background Art

[0002] Traditional force or displacement testing devices utilize a multi-angle adjustable clamping mechanism, requiring manual adjustment of the sensor position. This cumbersome process makes it difficult to achieve the desired position, resulting in low test efficiency and poor accuracy. Furthermore, the clamping mechanism has large ends, requiring two clamping mechanisms for simultaneous force and displacement measurement, which can easily interfere with each other and be difficult to adjust. During testing, the linear actuator experiences slight slippage due to the reaction force, significantly interfering with micro- and nano-scale measurement experiments and reducing test accuracy.

[0003] Patent document CN112924280A (application number: 202110110885.0) discloses a device for testing the bearing capacity of a honeycomb steel arch in a plane. The device comprises a workbench, a pair of fixing units, a vertical loading unit, and a detection unit. The workbench comprises a tabletop, a gantry, and legs. The fixing unit comprises a fixing base and a mounting frame. The bottom of the fixing base is fixedly connected to the tabletop and is rotatably connected to the mounting frame within the fixing base. The honeycomb steel arch is mounted between the two mounting frames. The vertical loading unit comprises a jack and a pressure sensor. The detection unit comprises a pair of settlement and displacement testing mechanisms, a vertical displacement measuring mechanism, a strain gauge, and a data acquisition device. The settlement and displacement testing mechanism comprises a dial indicator and a dial indicator fixing base. The vertical displacement measuring mechanism comprises a support mechanism and a displacement sensor. The present invention also includes a detection method, comprising the following steps: fixing the honeycomb steel arch with the fixing unit, applying a vertical load with the vertical loading unit, and detecting the limit load value with the detection unit. This testing device is difficult to replace sensors, which limits its test range for forces and displacements of varying precision. Furthermore, the force loading is achieved by the jack, resulting in low loading accuracy.

[0004] Patent document CN101191748A (Application Number: 200610114637.9) discloses a high-temperature superconducting magnetic levitation or motor quasi-static force testing device. This device utilizes two electromagnetic motors to adjust the position of the test object and uses sensors to measure force. Compared to piezoelectric drives, conventional electromagnetic motors have lower drive accuracy, limiting their application in high-precision testing.

[0005] Patent document CN1687737A (Application Number: 200510025778.9) discloses a device for testing the compressive load and displacement of automotive sealing strips. A stepper motor, controlled by a computer, drives the transmission mechanism. This transmission mechanism, consisting of a gear pair and a screw-nut pair, drives a pressure head in linear motion, which is applied directly to the sealing strip specimen. A grating scale is mounted on the cantilever of the pressure head to obtain the precise displacement of the pressure head, which is read on a digital display. A force sensor is mounted on the pressure head. The resistance generated by the compression deformation of the sealing strip specimen causes the elastic element of the force sensor to deform, which is reflected by the voltage change of the resistance strain gauge measuring bridge. A computer converts the voltage value into the compressive load applied to the sealing strip specimen using the force-voltage calibration curve of the force sensor. A CCD measurement system is mounted on one side of the sealing strip specimen to measure the spatial position change trajectory of points at different locations on the sealing strip specimen during compression. This patent discloses a device for testing the force-displacement response of automotive sealing strip compression. The device utilizes a gear pair and a screw-nut for transmission, resulting in a complex structure.

[0006] To address the problems encountered in the above-mentioned tests, the present invention aims to provide a piezoelectrically driven, integrated, high-precision force and displacement testing platform. This platform utilizes piezoelectric drive, enabling high-precision displacement and force testing. It is directly driven, lacks a complex transmission mechanism, and boasts a simple structure. This platform avoids the inefficiency and operational difficulties associated with manually adjusting the sensor. The centering clamping mechanism secures the product being tested, making it difficult to slip, further improving test accuracy and efficiency. This platform addresses the challenges of linear actuator force and displacement testing by providing a high-precision, high-efficiency, integrated testing platform and solution. Summary of the Invention

[0007] In view of the defects in the prior art, the purpose of the present invention is to provide a piezoelectrically driven force and displacement integrated high-precision testing platform and method.

[0008] According to the present invention, a piezoelectric-driven integrated force and displacement high-precision test platform is provided, comprising: a top clamping beam 1, a sensor 2, a linear actuator 4, a piezoelectric threaded linear motor 5, a centering clamping mechanism 7, a guide rail, a piezoelectric rotary motor 10, and a bottom adapter plate 14;

[0009] The two ends of the top clamping beam 1 are respectively fixedly connected to the piezoelectric threaded linear motor 5; the sensor 2 passes through the top clamping beam 1 and contacts the linear actuator 4 for measurement; the measured posture is adjusted by the synchronous up and down high-precision movement of the piezoelectric threaded linear motor 5; the linear actuator 4 is placed on the centering clamping mechanism 7, and the center clamping mechanism 7 is connected to the guide rail; the guide rail is connected to the piezoelectric rotary motor 10 and fixed to the bottom adapter plate 14;

[0010] The piezoelectric rotary motor 10 drives the connecting rod to drive the guide rail and then drives the center clamping mechanism 7 to achieve centering clamping of the linear actuator 4; the linear actuator 4 is powered on to carry out force / displacement measurement.

[0011] Preferably, circular rings are provided at both ends of the top clamping beam 1, which are respectively connected to the piezoelectric threaded linear motor 5; a beam structure with a rectangular through hole is in the middle; threaded through holes are symmetrically and evenly provided on both sides of the beam structure with the rectangular through hole; the sensor 2 passes through the rectangular through hole, and the clamping screw 3 is used to pass through the threaded through hole to realize the positioning and fixation of the sensor.

[0012] Preferably, the piezoelectric threaded linear motor 5 includes a piezoelectric threaded rotor 51 , a piezoelectric threaded vibrator 52 and a first piezoelectric ceramic sheet group 53 ;

[0013] The piezoelectric threaded rotor 51 is a cylindrical structure with threaded blind holes at both ends;

[0014] The piezoelectric threaded vibrator 52 is a cylindrical structure with a rectangular through hole inside. One end of the piezoelectric threaded vibrator 52 is provided with an external thread to connect to the piezoelectric threaded rotor 51; the other end is symmetrically provided with a rectangular beam, and the ends of the two rectangular beams are symmetrically provided with cylindrical structures with through holes, which are fixedly connected to the bottom adapter plate 14 by screws.

[0015] The first piezoelectric ceramic sheet group 53 includes four identical rectangular piezoelectric ceramic sheets; the four piezoelectric ceramic sheets are adhered to the four side surfaces of the rectangular through hole inside the piezoelectric threaded vibrator 52 .

[0016] Preferably, the centering clamping mechanism 7 comprises a movable baffle, a base plate 73 and a rotating connecting rod;

[0017] The movable baffle includes a first movable baffle 71 and a second movable baffle 72, which are symmetrically arranged on both sides of the linear actuator 4 and are used to clamp and fix the linear actuator 4;

[0018] The bottom plate 73 is a square plate with a threaded blind hole at the bottom;

[0019] The rotating link comprises a first rotating link 74, a central rotating link 75 and a second rotating link 76;

[0020] The first rotating connecting rod 74 and the second rotating connecting rod 76 are both symmetrically provided with circular rings at both ends, and the symmetrical circular rings at both ends are connected by an arc rod;

[0021] The two ends of the central rotating link 75 are symmetrically provided with cylindrical structures, and the upper and lower sections of the cylindrical structure are symmetrically provided with cylindrical bosses; the center of the central rotating link 75 is provided with a cylindrical structure with a through hole;

[0022] One end of the first rotating link 74 is connected to the central rotating link 75 and the bottom plate 73, and the other end is connected to the upper guide rail 8 and the first movable baffle 71;

[0023] One end of the second rotating link 76 is connected to the central rotating link 75 and the bottom plate 73, and the other end is connected to the upper guide rail 8 and the second movable baffle 72;

[0024] The central rotating connecting rod 75 is connected to the central shaft 15 via a bearing; the movement of the rotating connecting rod drives the upper guide rail 8 to move in a straight line.

[0025] Preferably, the guide rail includes an upper guide rail 8 and a lower guide rail 9; the bottom of the lower guide rail 9 is a rectangular structure, a rectangular boss is provided on the upper part, rectangular beams are symmetrically provided on both sides, and circular ring structures are provided at both ends of the rectangular beam; the upper guide rail 8 is a rectangular structure, a rectangular groove is provided at the bottom, and a cylindrical boss is provided on the upper part, and the rectangular groove surface of the upper guide rail 8 is smoothly matched with the rectangular boss surface of the lower guide rail 9.

[0026] Preferably, the piezoelectric rotary motor 10 includes: a piezoelectric vibrator 11, a rotor 13 and a second piezoelectric ceramic sheet group 12;

[0027] The center of the piezoelectric vibrator 11 is a circular ring structure, with four identical driving feet evenly distributed around it. The driving feet are rectangular parallelepiped structures, and two symmetrical rectangular beam structures are set at the nodes. The nodes are the points where the piezoelectric vibrator motion displacement is theoretically 0; the ends of the rectangular beams are provided with cylindrical structures with through holes.

[0028] The rotor 13 is composed of a bottom frustum structure and an upper cylindrical structure. A stepped through hole is provided in the center of the rotor 13 for mating with the central shaft 15. Threaded blind holes are symmetrically provided on both sides of the through hole for fixed connection with the central rotating connecting rod 75.

[0029] The second piezoelectric ceramic sheet group 12 is a square plate structure, with four piezoelectric ceramic sheets in a group and evenly distributed on the sides of the four driving feet, with a total of 16 piezoelectric ceramic sheets.

[0030] Preferably, the central shaft 15 is a cylindrical structure, and an external thread is provided at the end of the cylindrical structure, which is connected to a pre-tightening nut 17. The pre-pressure between the rotor 13 and the piezoelectric vibrator 11 is adjusted by adjusting the pre-tightening nut 17; the other end of the cylindrical structure is interference fit with the bearing 16.

[0031] Preferably, the bottom plate connecting plate 14 is a rectangular plate structure, with 12 first through holes evenly distributed along the outer side, 8 second through holes symmetrically arranged on the inner side, and a stepped hole set in the middle.

[0032] According to a piezoelectrically driven integrated force and displacement testing method provided by the present invention, the following steps are performed using the piezoelectrically driven integrated force and displacement high-precision testing platform described above:

[0033] Step S1: The linear actuator 4 is placed above the base plate 73, and the piezoelectric rotary motor is powered on. The rotor movement drives the centering clamping mechanism to move, and the movable baffles on both sides are tightly attached to the two sides of the linear actuator. The piezoelectric rotary motor is powered off and self-locked.

[0034] Step S2: Connect one end of the sensor to the control system and place the other end in the middle of the top clamping beam. Adjust the clamping screw so that the end of the sensor is placed in the middle of the actuator and fix it with the clamping screw. The sensors are force sensors and laser displacement sensors.

[0035] Step S3: The piezoelectric threaded linear motor is powered on and works at the same time, and the distance between the end of the force sensor and the end of the linear actuator is adjusted in the vertical direction. The high-precision movement characteristics of the piezoelectric threaded motor are used to make the contact sensor better contact the end of the linear actuator, that is, the contact sensor just has a reading, and the piezoelectric threaded linear motor is powered off and self-locked.

[0036] Step S4: The linear actuator is powered on to achieve linear motion. The sensor simultaneously collects force and displacement data, transmits them to the computer, and stores them. The linear motor is then powered to achieve upward linear motion. The sensor is then removed from the actuator surface, disengaging it from contact. The test is complete. Alternatively, force or displacement testing can be performed independently.

[0037] Compared with the existing technology, the present invention has the following beneficial effects: the present invention utilizes the advantages of simple structure, high-precision drive and power-off self-locking of the piezoelectric motor, and through the technical features of combining the piezoelectric rotary motor and the piezoelectric threaded linear motor, realizes the technical effect of integrating a high-precision test platform for force and displacement into one, avoids the measurement errors and manual operation difficulties caused by manual adjustment and centering, improves the test accuracy, and the integrated design improves the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0039] Figure 1 This is a three-dimensional diagram of the piezoelectrically driven force and displacement integrated test platform of the present invention;

[0040] Figure 2 is a three-dimensional diagram of the top clamping device of the present invention;

[0041] Figure 3 This is the structural diagram and principle diagram of the piezoelectric thread linear motor in the present invention;

[0042] Figure 4 These are the two first-order bending vibration modes of the piezoelectric threaded vibrator in the present invention;

[0043] Figure 5 It is a three-dimensional diagram of the centering clamping mechanism of the present invention;

[0044] Figure 6 It is a quarter cross-sectional view of the medium-voltage electric rotating motor and the base plate of the present invention.

[0045] Among them, 1-top clamping beam, 2-sensor, 3-clamping screw, 4-linear actuator, 5-first piezoelectric threaded linear motor, 51-piezoelectric threaded rotor, 52-piezoelectric threaded vibrator, 53-first piezoelectric ceramic sheet group, 6-second piezoelectric threaded linear motor, 7-centering clamping mechanism, 71-first moving baffle, 72-second moving baffle, 73-bottom plate, 74-first rotating link, 75-center rotating link, 76-second rotating link, 8-upper guide rail, 9-lower guide rail, 10-piezoelectric rotary motor, 11-piezoelectric vibrator, 12-second piezoelectric ceramic sheet group, 13-rotor, 14-bottom adapter plate, 15-center shaft, 16-bearing, 17-pre-tightening nut. DETAILED DESCRIPTION

[0046] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0047] Example 1

[0048] The technical solution of the present invention is further described in detail below with reference to the accompanying drawings:

[0049] The present invention can be implemented in many different forms and should not be considered to be limited to the embodiments described herein. On the contrary, these embodiments are provided to make this disclosure thorough and complete and will fully convey the scope of the invention to those skilled in the art. In the accompanying drawings, components are enlarged for clarity.

[0050] Figure 1 It is a three-dimensional diagram of the piezoelectric-driven integrated force and displacement test platform, including the top clamping beam, sensor, linear actuator, piezoelectric threaded linear motor, centering clamping mechanism, guide rail, piezoelectric rotary motor, center axis and bottom adapter plate.

[0051] The two ends of the top clamping beam are fixedly connected to the piezoelectric threaded linear motor by screws. When the piezoelectric threaded motor is in working state, it can drive the top clamping beam to reciprocate in the vertical direction with high precision to adjust the distance between the sensor and the linear actuator (the product being measured) to the optimal position.

[0052] When the piezoelectric rotary motor is operating, its rotor motion drives the central rotating link, which in turn drives the first and second rotating links, which in turn move the movable baffles on both sides of the centering clamping mechanism, tightly fitting them against the linear actuator. The piezoelectric rotary motor then self-locks upon power failure, acting as a limiter. The guide rail, piezoelectric vibrator, and bottom adapter plate are securely connected by screws. The bottom adapter plate has 12 through-holes, the same size as those in a typical vibration isolation platform, allowing it to be secured to the platform with screws.

[0053] Figure 2 This is a 3D diagram of the top clamping beam. The top clamping beam is a beam structure with circular rings at each end and a rectangular through-hole in the middle. Threaded holes are evenly spaced at both ends. The threaded holes and clamping screws can be adjusted to position and secure the sensor. The even arrangement of multiple threaded holes allows for more positioning options and allows for simultaneous installation and positioning of multiple sensors.

[0054] Figure 3 The three-dimensional diagram and principle diagram of the piezoelectric threaded linear motor shown. The piezoelectric threaded linear motor includes a piezoelectric threaded rotor, a piezoelectric threaded vibrator, and a first piezoelectric ceramic plate group; the piezoelectric threaded rotor is a cylindrical structure with threaded blind holes at both ends;

[0055] The piezoelectric threaded vibrator is a cylindrical structure with a rectangular through hole inside. One end of the outside is provided with an external thread, and the other end is symmetrically provided with a rectangular beam. The ends of the two rectangular beams are provided with a cylindrical structure with a through hole. The first piezoelectric ceramic sheet group includes four identical rectangular piezoelectric ceramic sheets. The four piezoelectric ceramic sheets are glued to the four sides of the rectangular hole inside the piezoelectric threaded vibrator. Their internal arrangement is shown in FIG. Figure 3 As shown in the upper left corner, the plus sign represents the polarization direction of the piezoelectric ceramic. The two piezoelectric ceramics in opposite directions are set as Group A and Group B respectively. Two first-order bending vibration modes are excited as shown in Figure 3 As shown in the figure on the right, the two modes couple to produce the first-order bending micro-vibration of the piezoelectric thread oscillator in space, which drives the piezoelectric thread rotor to rotate linearly along the thread through friction. The simulation mode diagram of the piezoelectric thread oscillator is shown in Figure 4 shown.

[0056] Figure 5This is a three-dimensional diagram of a centering clamping mechanism. The centering clamping mechanism includes a movable baffle, a base plate, and a rotating link assembly. The movable baffles include a first and a second movable baffle, symmetrically arranged on either side of the linear actuator, for clamping and securing the linear actuator. The base plate is a square plate with a threaded blind hole at the bottom, and is screwed to the ends of the central shaft. The rotating link assembly includes a first rotating link, a central rotating link, and a second rotating link. The first rotating link has symmetrical rings at both ends and an arc-shaped rod in the middle. The first and second rotating links have identical structures. Cylindrical structures are symmetrically arranged at both ends of the central rotating links, with cylindrical bosses arranged on the upper and lower ends of the cylindrical structures. A cylindrical structure with a through hole is arranged in the middle of the central rotating links. The first rotating link is connected to the upper guide rail and the central rotating link via bearings at both ends. The second rotating link is connected to the upper guide rail and the central rotating link via bearings at both ends. The central rotating link is connected to the central shaft via bearings. The movement of the rotating link causes the upper guide rail to move in a linear direction.

[0057] The guide rail includes an upper guide rail and a lower guide rail. The bottom of the lower guide rail is a rectangular structure, a rectangular boss is provided on the upper part, rectangular beams are symmetrically provided on both sides, and circular ring structures are provided at both ends of the rectangular beams; the upper guide rail is a rectangular structure, a rectangular groove is provided at the bottom, and a cylindrical boss is provided on the upper part.

[0058] Figure 6 This is a quarter-section view of the piezoelectric rotary motor and base plate. The piezoelectric rotary motor is secured to the bottom adapter plate at the cylindrical structure via screws. The piezoelectric rotary motor uses piezoelectric ceramics to induce a micro-elliptical motion in the piezoelectric vibrator ring. Friction at the contact point between the rotor and the piezoelectric vibrator drives the rotor's rotation. The central shaft is secured to the piezoelectric rotary motor via bearings and a preload nut. The preload thread adjusts the preload between the rotor and the piezoelectric vibrator, ensuring optimal motor operation.

[0059] The present invention also discloses a piezoelectrically driven force and displacement integrated testing method, comprising the following steps:

[0060] Step S1: Place the linear actuator of the product to be tested on the base plate, power on the piezoelectric rotary motor, and the rotor movement drives the centering clamping mechanism to move. The movable baffles on both sides are tightly attached to the two sides of the linear actuator, and the piezoelectric rotary motor is powered off and self-locked.

[0061] Step S2: Connect one end of the force sensor and laser displacement sensor to the control system, and place the other end in the middle of the top clamping beam. Adjust the clamping screws so that the ends of the force sensor and laser displacement sensor are placed in the middle of the actuator as much as possible, and fix them with the clamping screws.

[0062] Step S3: The piezoelectric threaded linear motor is powered on and works at the same time, and the distance between the end of the force sensor and the end of the linear actuator is adjusted in the vertical direction. The high-precision movement characteristics of the piezoelectric threaded motor are used to make the contact sensor better contact the end of the linear actuator, that is, the contact sensor just has a reading, and the piezoelectric threaded linear motor is powered off and self-locked.

[0063] Step S4: The linear actuator is powered on, and the sensor simultaneously collects force and displacement data, transmits it to the computer, and stores it. The linear motor is then powered, disengaging the force sensor from the linear actuator. The sensor is then removed, and the test is complete. Alternatively, force or displacement measurements can be performed independently.

[0064] This invention combines the advantages of a piezoelectric motor's simple structure, high-precision actuation, and power-off self-locking function to integrate linear actuator force and displacement testing into a single test platform. Its direct drive eliminates the need for complex transmission mechanisms and simplifies the structure. Furthermore, it avoids the poor accuracy, low efficiency, and operational difficulties associated with manual sensor adjustment, improving the accuracy and efficiency of actuator force and displacement testing.

[0065] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art and, unless defined as such, will not be interpreted in an idealized or overly formal sense.

[0066] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0067] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0068] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A piezoelectrically driven force and displacement integrated high-precision test platform, characterized in that: include: A top clamping beam (1), a sensor (2), a linear actuator (4), a piezoelectric threaded linear motor (5), a centering clamping mechanism (7), a guide rail, a piezoelectric rotary motor (10), and a bottom adapter plate (14); The two ends of the top clamping beam (1) are respectively fixedly connected to the piezoelectric threaded linear motor (5); the sensor (2) passes through the top clamping beam (1) and contacts the linear actuator (4) for measurement; the piezoelectric threaded linear motor (5) synchronously moves up and down with high precision to adjust the measurement posture; the linear actuator (4) is placed on the centering clamping mechanism (7), and the center clamping mechanism (7) is connected to the guide rail; the guide rail is connected to the piezoelectric rotary motor (10) and fixed to the bottom adapter plate (14); The piezoelectric rotary motor (10) drives the connecting rod to drive the guide rail and then drives the center clamping mechanism (7) to achieve centering clamping of the linear actuator (4); the linear actuator (4) is powered on to start force / displacement measurement; The centering clamping mechanism (7) comprises a movable baffle, a base plate (73) and a rotating connecting rod; The movable baffle comprises a first movable baffle (71) and a second movable baffle (72), which are symmetrically arranged on both sides of the linear actuator (4) and are used to clamp and fix the linear actuator (4); The bottom plate (73) is a square plate with a threaded blind hole at the bottom; The rotating link comprises a first rotating link (74), a central rotating link (75) and a second rotating link (76); The first rotating connecting rod (74) and the second rotating connecting rod (76) are both symmetrically provided with circular rings at both ends, and the symmetrical circular rings at both ends are connected by an arc rod; The two ends of the central rotating connecting rod (75) are symmetrically provided with cylindrical structures, and the upper and lower sections of the cylindrical structure are symmetrically provided with cylindrical bosses; the center of the central rotating connecting rod (75) is provided with a cylindrical structure having a through hole; One end of the first rotating link (74) is connected to the central rotating link (75) and the bottom plate (73), and the other end is connected to the upper guide rail (8) and the first movable baffle (71); One end of the second rotating link (76) is connected to the central rotating link (75) and the bottom plate (73), and the other end is connected to the upper guide rail (8) and the second movable baffle (72); The central rotating connecting rod (75) is connected to the central shaft (15) via a bearing; the movement of the rotating connecting rod drives the upper guide rail (8) to move along a straight line.

2. The piezoelectrically driven force and displacement integrated high-precision test platform according to claim 1, characterized in that: Circular rings are provided at both ends of the top clamping beam (1), which are respectively connected to the piezoelectric threaded linear motor (5); a beam structure with a rectangular through hole is provided in the middle; threaded through holes are symmetrically and evenly provided on both sides of the beam structure with the rectangular through hole; the sensor (2) passes through the rectangular through hole, and a clamping screw (3) is used to pass through the threaded through hole to achieve positioning and fixing of the sensor.

3. The piezoelectrically driven force and displacement integrated high-precision testing platform according to claim 1, characterized in that: The piezoelectric threaded linear motor (5) comprises a piezoelectric threaded rotor (51), a piezoelectric threaded vibrator (52), and a first piezoelectric ceramic sheet group (53); The piezoelectric threaded rotor (51) is a cylindrical structure, with threaded blind holes provided at both ends; The piezoelectric threaded vibrator (52) is a cylindrical structure with a rectangular through hole inside. An external thread is provided at one end of the piezoelectric threaded vibrator (52) to connect with the piezoelectric threaded rotor (51); a rectangular beam is symmetrically provided at the other end, and cylindrical structures with through holes are symmetrically provided at the ends of the two rectangular beams, which are fixedly connected to the bottom adapter plate (14) by screws. The first piezoelectric ceramic sheet group (53) comprises four identical rectangular piezoelectric ceramic sheets; the four piezoelectric ceramic sheets are adhered to the four side surfaces of the rectangular through hole inside the piezoelectric threaded vibrator (52).

4. The piezoelectrically driven force and displacement integrated high-precision testing platform according to claim 1, characterized in that: The guide rail comprises an upper guide rail (8) and a lower guide rail (9); the bottom of the lower guide rail (9) is a rectangular structure, a rectangular boss is provided on the top, rectangular beams are symmetrically provided on both sides, and circular ring structures are provided at both ends of the rectangular beams; the upper guide rail (8) is a rectangular structure, a rectangular groove is provided on the bottom, and a cylindrical boss is provided on the top, and the rectangular groove surface of the upper guide rail (8) is smoothly matched with the rectangular boss surface of the lower guide rail (9).

5. The piezoelectric driven force and displacement integrated high-precision test platform according to claim 1, characterized in that: The piezoelectric rotary motor (10) comprises: a piezoelectric vibrator (11), a rotor (13) and a second piezoelectric ceramic sheet group (12); The center of the piezoelectric vibrator (11) is a circular ring structure, with four identical driving feet evenly distributed around it. The driving feet are rectangular parallelepiped structures, and two symmetrical rectangular beam structures are set at the nodes. The nodes are points where the piezoelectric vibrator motion displacement is theoretically 0; the ends of the rectangular beams are provided with cylindrical structures with through holes. The rotor (13) is composed of a bottom frustum structure and an upper cylindrical structure. A stepped through hole is provided at the center of the rotor (13) for mating with the central shaft (15); threaded blind holes are symmetrically provided on both sides of the through hole for fixed connection with the central rotating connecting rod (75); The second piezoelectric ceramic sheet group (12) is a square plate structure, with four piezoelectric ceramic sheets in a group, evenly distributed on the sides of the four driving feet, and a total of 16 piezoelectric ceramic sheets.

6. The piezoelectrically driven force and displacement integrated high-precision testing platform according to claim 5, characterized in that: The central shaft (15) is a cylindrical structure, and an external thread is provided at the end of the cylindrical structure and is connected to a pre-tightening nut (17). The pre-pressure between the rotor (13) and the piezoelectric vibrator (11) is adjusted by adjusting the pre-tightening nut (17); the other end of the cylindrical structure is interference-fitted with a bearing (16).

7. The piezoelectrically driven force and displacement integrated high-precision testing platform according to claim 1, characterized in that: The bottom connecting plate (14) is a rectangular plate structure, with 12 first through holes evenly distributed along the outer periphery, 8 second through holes symmetrically arranged on the inner side, and a stepped hole arranged in the middle.

8. A piezoelectrically driven force and displacement integrated testing method, characterized in that: The following steps are performed using the piezoelectrically driven force and displacement integrated high-precision test platform according to any one of claims 1 to 7: Step S1: placing the linear actuator (4) above the base plate (73), powering on the piezoelectric rotary motor, causing the rotor to move and the centering clamping mechanism to move, with the movable baffles on both sides tightly fitting the two sides of the linear actuator, and the piezoelectric rotary motor being powered off and self-locking; Step S2: Connect one end of the sensor (2) to the control system, and place the other end in the middle of the top clamping beam (1), adjust the clamping screw (3) so that the end of the sensor (2) is placed in the middle of the linear actuator (4), and fix it with the clamping screw (3); the sensors (2) are respectively a force sensor and a laser displacement sensor; Step S3: The piezoelectric threaded linear motor (5) is powered on and works at the same time, and the distance between the end of the force sensor and the end of the linear actuator is adjusted in the vertical direction. The high-precision movement characteristics of the piezoelectric threaded linear motor are utilized to make the contact sensor better contact the end of the linear actuator. When the contact sensor just shows a reading, the piezoelectric threaded linear motor is powered off and self-locked. Step S4: The linear actuator is powered on to achieve linear motion; the sensor simultaneously collects force and displacement data, transmits them to the computer and stores them; then the voltage is supplied to the threaded linear motor to achieve upward linear motion; The sensor is disengaged from the surface of the linear actuator, and the sensor is removed to end the test; thus, the force or displacement test is achieved.

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