Piezoelectric actuator testing device and method

Abstract

The invention is suitable for the technical field of test equipment, and provides a piezoelectric actuator test device and method, and the piezoelectric actuator test device comprises a main frame body, a clamping force application mechanism, an electric connection mechanism and a displacement detection mechanism. The first clamping assembly is fixedly arranged on the main frame body, and the force loading assembly drives the second clamping assembly to move so as to clamp and fix a sample. A force sensing unit is arranged between the driving end of the force loading assembly and the second clamping assembly and is used for detecting the thrust applied to the second clamping assembly and the sample by the force loading assembly and the counter-acting force applied to the second clamping assembly by the sample. The test voltage applied to the sample can be adjusted and detected through the electric connection mechanism, and the position of the second clamping assembly, namely the length change of the sample, is detected through the displacement detection mechanism. Through cooperation of the clamping force application structure, the displacement detection mechanism and the electric communication mechanism, measurement of a blocking force parameter, a rigidity parameter and a maximum displacement parameter of a sample can be realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of testing equipment, and in particular relates to a piezoelectric driver testing device and method. Background Art

[0002] A piezoelectric actuator is a device that uses the piezoelectric effect to generate high-precision displacement or force. It can be used to drive an object to move or adjust its position. It is often used in the positioning control of precision instruments and equipment, such as precision optical systems, semiconductor manufacturing, aerospace microcontrol systems, microfluidic control, microsurgical tools and other fields. Before using the piezoelectric actuator, it is necessary to know the basic functional parameters of the piezoelectric actuator, such as maximum displacement, blocking force or stiffness, etc., to provide accurate numerical support for subsequent system design. However, most of the existing piezoelectric actuators have the technical problem of difficulty in parameter detection. Summary of the invention

[0003] The purpose of the present invention is to provide a piezoelectric driver testing device and method, aiming to solve the technical problem of difficulty in parameter detection of piezoelectric drivers in the prior art when they are in use.

[0004] The present invention is implemented in this way. In a first aspect, a piezoelectric driver testing device is provided, comprising:

[0005] Main frame;

[0006] A clamping force-applying mechanism, the clamping force-applying mechanism comprises a first clamping assembly, a second clamping assembly, a force-applying assembly and a force-sensing unit, the first clamping assembly is fixedly mounted on the main frame, the second clamping assembly has a degree of freedom to move along a first direction relative to the first clamping assembly, the second clamping assembly is used to cooperate with the first clamping assembly to clamp and fix the sample, the driving end of the force-applying assembly is connected to the second clamping assembly, the force-applying assembly is used to drive the second clamping assembly to move along the first direction, the force-sensing unit is arranged between the driving end of the force-applying assembly and the second clamping assembly, and the force-sensing unit is used to detect the thrust applied by the force-applying assembly to the second clamping assembly and the sample, and the reaction force applied by the sample to the second clamping assembly;

[0007] an electrical connection mechanism, the electrical connection mechanism being disposed on the main frame and being used to electrically connect the clamped sample to an external circuit so as to apply a preset voltage to the sample; and

[0008] A displacement detection mechanism is disposed on the main frame and is used to detect the position of the second clamping assembly to monitor the length change of the sample.

[0009] In an optional embodiment, the displacement detection mechanism includes a displacement sensor and an adjustment component, and the adjustment component is arranged between the displacement sensor and the main frame to adjust the relative position between the displacement sensor and the main frame.

[0010] In an optional embodiment, the adjustment assembly includes a displacement base, a sensor bracket and an adjustment drive unit, the displacement base is fixed on the main frame, the first end of the sensor bracket is slidably connected to the displacement base, and the second end extends in a direction close to the second clamping assembly, the displacement sensor is arranged at the second end of the sensor bracket, the adjustment drive unit is arranged on the displacement base, and the driving end of the adjustment drive unit is connected to the sensor bracket for driving the sensor bracket to slide along the first direction.

[0011] In an optional embodiment, a supporting connection column is provided between the driving end of the force loading assembly and the second clamping assembly, an avoidance structure is provided on the supporting connection column, and the second end of the sensor bracket extends to the interior of the avoidance structure.

[0012] In an optional embodiment, the electrical communication mechanism includes a flexible electrode and an electrode driving assembly, the number of the flexible electrodes is two, and the two flexible electrodes have the freedom to move along a second direction relative to the main frame. The two flexible electrodes are arranged opposite to each other, and the electrode driving assembly is used to drive the two flexible electrodes to move relative to or away from each other.

[0013] In an optional embodiment, the electrode driving assembly includes an electrode slide rail, an insulating sliding block, an electrode mounting seat and an electrode driving unit. The electrode slide rail is fixed on the main frame and is arranged along the second direction. The number of the insulating sliding blocks and the electrode mounting seat is two. Both the insulating sliding blocks are slidably set on the electrode slide rail. The electrode driving unit is used to drive the two insulating sliding blocks to move relative to or away from each other along the electrode slide rail, and the two flexible electrodes are mounted on the insulating sliding blocks through the electrode mounting seat.

[0014] In an optional embodiment, the first direction is a vertical direction, and the second clamping assembly is located below the first clamping assembly.

[0015] In an optional embodiment, the second clamping assembly includes a pressing head, a pressing head base and an elastic member, the pressing head is used to abut against the lower end of the sample, the pressing head base is arranged below the pressing head, and the elastic member is arranged between the pressing head base and the pressing head for supporting the pressing head.

[0016] In an optional embodiment, the second clamping assembly includes an upper pressing head and an upper pressing head base, the upper pressing head base is fixed on the main frame, the upper pressing head is arranged on the upper pressing head base, and is located directly above the lower pressing head.

[0017] In a second aspect, a piezoelectric driver testing method is provided, comprising the following steps:

[0018] The sample is placed between the first clamping assembly and the second clamping assembly, and the force loading assembly drives the second clamping assembly to move in a direction close to the first clamping assembly to clamp the sample with a test pressure;

[0019] Adjust the detection end of the displacement detection mechanism to zero position, electrically connect the clamped sample to the external circuit through the electrical connection mechanism, and apply a test voltage to the sample through the external circuit;

[0020] One of the position value, the test voltage value and the test pressure value of the second clamping component is defined as the first value, and the other two are the second value and the third value, the value of the first value is kept unchanged, and the magnitude of one of the second value and the third value is linearly changed, and the magnitude change of the other of the second value and the third value is recorded, and the corresponding sample parameter is calculated according to the above value changes;

[0021] Along the first direction, the force loading assembly drives the second clamping assembly to move in a direction away from the first clamping assembly, and removes the sample from between the first clamping assembly and the second clamping assembly.

[0022] The technical effect of the present invention relative to the prior art is that: a clamping force structure including a first clamping assembly, a second clamping assembly, a force loading assembly and a force sensing unit is arranged on the main frame. The first clamping assembly is fixed on the main frame, and the second clamping movement is driven by the force loading assembly to achieve the clamping and fixing of the sample. A force sensing unit is arranged between the driving end of the force loading assembly and the second clamping assembly, which can detect the thrust applied by the force loading assembly to the second clamping assembly and the sample, and the reaction force applied by the sample to the second clamping assembly. At the same time, the test voltage applied to the sample can be adjusted and detected by the electrical connection mechanism, and the position of the second clamping assembly, that is, the length change of the sample, can be detected by the displacement detection mechanism. Compared with the test device in the prior art, the blocking force parameter, stiffness parameter and maximum displacement parameter of the sample can be measured by the cooperation of the clamping force structure, the displacement detection mechanism and the electrical connection mechanism, so that the measurement of various parameters of the sample is more accurate and the convenience of measurement is improved.

[0023] It can be understood that the beneficial effects of the second aspect mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments of the present invention or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 is a structural schematic diagram of a piezoelectric driver testing device provided by an embodiment of the present invention;

[0026] Figure 2 yes Figure 1 A schematic diagram of the structure viewed from the side along the direction A;

[0027] Figure 3 yes Figure 1 A schematic diagram of the side structure along the B direction;

[0028] Figure 4 is a schematic structural diagram of a clamping force-applying mechanism used in an embodiment of the present invention;

[0029] Figure 5 is a schematic structural diagram of a displacement detection mechanism used in an embodiment of the present invention;

[0030] Figure 6 It is a schematic structural diagram of the electrical connection mechanism used in the embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1. Main frame; 2. Clamping force-applying mechanism; 21. First clamping assembly; 211. Upper pressure head; 212. Upper pressure head base; 22. Second clamping assembly; 221. Lower pressure head; 222. Lower pressure head base; 223. Elastic member; 23. Force loading assembly; 24. Force sensing unit; 3. Electrical connection mechanism; 31. Flexible electrode; 32. Electrode driving assembly; 321. Electrode slide rail; 322. Insulating sliding block; 323. Electrode mounting seat; 324. Electrode driving unit; 4. Displacement detection mechanism; 41. Displacement sensor; 42. Adjustment assembly; 421. Displacement base; 422. Sensor bracket; 423. Adjustment driving unit; 424. Clamping member; 5. Sample; 6. External circuit; 7. Support connecting column; 71. Avoidance structure. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0034] In the description of the present invention, it should be understood that the terms "length", "width", "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 drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0038] Please refer to Figures 1 to 4As shown, in an embodiment of the present invention, in the first aspect, a piezoelectric driver testing device is provided, including a main frame 1, a clamping force applying mechanism 2, an electrical connection mechanism 3 and a displacement detection mechanism 4. The clamping force applying mechanism 2 includes a first clamping component 21, a second clamping component 22, a force loading component 23 and a force sensing unit 24, the first clamping component 21 is fixed on the main frame 1, the second clamping component 22 has a degree of freedom to move along a first direction relative to the first clamping component 21, the second clamping component 22 is used to cooperate with the first clamping component 21 to clamp and fix the sample 5, the driving end of the force loading component 23 is connected to the second clamping component 22, the force loading component 23 is used to drive the second clamping component 22 to move along the first direction, the force sensing unit 24 is arranged between the driving end of the force loading component 23 and the second clamping component 22, and the force sensing unit 24 is used to detect the thrust applied by the force loading component 23 to the second clamping component 22 and the sample 5, and the reaction force applied by the sample 5 to the second clamping component 22. The electrical connection mechanism 3 is disposed on the main frame 1, and is used to electrically connect the clamped sample 5 with the external circuit 6 to apply a test voltage to the sample 5. The displacement detection mechanism 4 is disposed on the main frame 1, and is used to detect the position of the second clamping assembly 22 to monitor the length change of the sample 5.

[0039] Specifically, the main frame 1 refers to a supporting component with a certain height, and the main frame 1 can be columnar, plate-shaped or a combination of multiple shapes. The clamping force-applying mechanism 2 refers to a mechanism that can clamp an object and apply a certain force to the object. In the clamping force-applying mechanism 2, the first clamping component 21 and the second clamping component 22 both refer to block components with a certain volume. The first clamping component 21 is fixed on the main frame 1 to keep its position fixed. The second clamping component 22 has the freedom to move along the first direction relative to the first clamping component 21, and the clamping and loosening of the sample 5 can be achieved by the movement of the second clamping component 22. The force loading component 23 refers to a component or assembly that can drive an object to move in a straight line. The force loading component 23 can be a cylinder, a hydraulic cylinder or an electric push rod, etc. The force loading component 23 can also be a driving structure composed of a screw slider assembly and a motor.

[0040] The force sensing unit 24 refers to a device that can sense and measure force and can convert force into an electrical signal. It can usually include parts such as an elastomer, a sensitive element, and a signal conversion circuit. The working principle of the sensitive element can be divided into strain type, piezoelectric type, and capacitive type. The electrical connection mechanism 3 refers to a component or assembly used to electrically connect the sample 5 to the external circuit 6. It can be achieved by setting a conductor component that can be movable and electrically connected to the external circuit 6, such as an electrode. And the connection and disconnection of the sample 5 and the external circuit 6 are achieved by controlling the contact or separation between the conductor component and the connection end of the sample 5. The displacement detection mechanism 4 refers to a component or assembly used to detect the change in the position of an object. The displacement detection mechanism 4 can be a separate displacement sensor 41, or it can be formed by combining the displacement sensor 41 with other structures to form a displacement detection mechanism 4, so that the displacement detection of the object is more convenient.

[0041] The piezoelectric driver testing device in this embodiment works as follows:

[0042] The sample 5 is placed between the first clamping assembly 21 and the second clamping assembly 22, and the force loading assembly 23 drives the second clamping assembly 22 to move in the direction close to the first clamping assembly 21, so as to clamp the sample 5 with the test pressure. The detection end of the displacement detection mechanism 4 is adjusted to zero position, and the clamped sample 5 is electrically connected to the external circuit 6 through the electrical connection mechanism 3, and the test voltage is applied to the sample 5 through the external circuit 6. One of the position change value of the second clamping assembly 22, the test voltage value and the test pressure value is defined as the first value, and the other two are the second value and the third value. During the test process, the value of the first value can be kept unchanged, and the magnitude of one of the second value and the third value can be linearly changed, and the magnitude change of the other of the second value and the third value can be recorded at the same time. The corresponding sample 5 parameters are calculated according to the above-mentioned numerical changes. For example, the position of the second clamping assembly 22 can be kept unchanged, and the value of the test voltage applied to the sample 5 can be linearly changed, and the value of the test pressure output at the sensor can be obtained and recorded at the same time, so that the voltage-force curve of the sample 5 can be obtained, thereby calculating the blocking force parameter of the sample 5. The working state of the force loading component 23 can be controlled to keep the value of the test pressure applied to the sample 5 unchanged. By linearly changing the value of the test voltage applied to the sample 5, and obtaining and recording the value of the position change of the second clamping component 22 output by the displacement detection mechanism 4, the voltage-displacement curve of the sample 5 can be obtained, thereby calculating the maximum displacement parameter of the sample 5. The value of the test voltage applied to the sample 5 can also be kept unchanged. By controlling the working state of the force loading component 23 to linearly change the value of the test pressure applied to the sample 5, and obtaining and recording the value of the position change of the second clamping component 22 output by the displacement detection mechanism 4, the force-displacement curve of the sample 5 can be obtained, thereby calculating the stiffness parameter of the sample 5. Finally, the second clamping component 22 is driven by the force loading component 23 to move in a direction away from the first clamping component 21, and the sample 5 is removed from between the first clamping component 21 and the second clamping component 22, completing the entire detection process of the sample 5.

[0043] It should be understood that the calculation process of the blocking force parameters, stiffness parameters and maximum displacement parameters of the above-mentioned sample 5 are conventional technical means that have been disclosed in the prior art and will not be repeated here.

[0044] The piezoelectric driver testing device provided in the embodiment of the present invention is provided with a clamping force-applying structure including a first clamping component 21, a second clamping component 22, a force-applying component 23 and a force-sensing unit 24 on the main frame 1. The first clamping component 21 is fixed on the main frame 1, and the second clamping movement is driven by the force-applying component 23 to achieve the clamping and fixing of the sample 5. A force-sensing unit 24 is provided between the driving end of the force-applying component 23 and the second clamping component 22, which can detect the thrust applied by the force-applying component 23 to the second clamping component 22 and the sample 5, and the reaction force applied by the sample 5 to the second clamping component 22. At the same time, the test voltage applied to the sample 5 can be adjusted and detected by the electrical connection mechanism 3, and the position of the second clamping component 22, that is, the length change of the sample 5, can be detected by the displacement detection mechanism 4. Compared with the testing device in the prior art, through the cooperation of the clamping force structure, the displacement detection mechanism 4 and the electrical connection mechanism 3, the blocking force parameters, stiffness parameters and maximum displacement parameters of the sample 5 can be measured, making the measurement of various parameters of the sample 5 more accurate and improving the convenience of measurement.

[0045] It should be understood that when the piezoelectric driver testing device in this embodiment is working, the electrical components in the device can be controlled and coordinated through control. How to control multiple components to work together through the controller is a conventional technical means that has been disclosed in the prior art and will not be repeated here.

[0046] In one embodiment, see Figure 3 and Figure 5 , the displacement detection mechanism 4 includes a displacement sensor 41 and an adjustment component 42, and the adjustment component 42 is arranged between the displacement sensor 41 and the main frame 1, and is used to adjust the relative position between the displacement sensor 41 and the main frame 1. Specifically, the displacement sensor 41 refers to a sensor that can measure the distance moved by an object and can convert the measurement result into an electrical signal. The measurement method of the displacement sensor 41 may include contact, laser or ultrasonic, etc. The adjustment component 42 refers to a component or assembly used to adjust the position of an object. In this embodiment, by arranging the adjustment component 42 between the displacement sensor 41 and the main frame 1, the position of the displacement sensor 41 can be adjusted according to the size of the sample 5 through the adjustment component 42, so that the displacement sensor 41 is always in the zero position during measurement, that is, the position where the displacement sensor 41 value is zero, so that the measurement of the second clamping component 22 is more convenient.

[0047] In one embodiment, see Figure 5The adjustment component 42 includes a displacement base 421, a sensor bracket 422 and an adjustment drive unit 423. The displacement base 421 is fixed on the main frame 1. The first end of the sensor bracket 422 is slidably connected to the displacement base 421, and the second end extends in the direction close to the second clamping component 22. The displacement sensor 41 is arranged at the second end of the sensor bracket 422. The adjustment drive unit 423 is arranged on the displacement base 421, and the driving end of the adjustment drive unit 423 is connected to the sensor bracket 422, which is used to drive the sensor bracket 422 to slide along the first direction. Specifically, the displacement base 421 refers to a component with a certain volume, and the displacement base 421 can be a block, a plate or a column. The sensor bracket 422 refers to a supporting component with a certain length, and the sensor bracket 422 can be a column, a plate or a strip, etc. The adjustment drive unit 423 refers to a component or component that drives an object to move in a straight line, and the adjustment drive unit 423 can be a cylinder, a hydraulic cylinder or an electric push rod, etc. The first end of the sensor bracket 422 is slidably connected to the displacement base 421, and the second end extends in a direction close to the second clamping assembly 22, and the displacement sensor 41 is arranged at the second end of the sensor bracket 422. The adjustment drive unit 423 is arranged on the displacement base 421, and the driving end of the adjustment drive unit 423 is connected to the sensor bracket 422, which is used to drive the sensor bracket 422 to slide along the first direction, thereby adjusting the position of the displacement sensor 41 in the first direction, so that the displacement sensor 41 can be zeroed according to the size of the sample 5, so that the measurement and calculation of various parameters of the sample 5 are more convenient and quick.

[0048] In an alternative embodiment, see Figure 5 A clamping member 424 is provided at the second end of the sensor bracket 422, and the displacement sensor 41 is connected to the second end of the sensor bracket 422 through the clamping member. The clamping member includes a main body and a clamping portion detachably provided on the main body, and the displacement sensor 41 is clamped between the main body and the clamping portion. Specifically, the clamping portion is plug-connected to the main body through a fastener, and a limiting groove for accommodating the displacement sensor 41 is provided on both the main body and the clamping portion, so that the displacement sensor 41 is more convenient to fix.

[0049] Based on the above-mentioned characteristic adjustment component 42, please refer to Figure 2 and Figure 3, a support connecting column 7 is arranged between the driving end of the force loading component 23 and the second clamping component 22, and a avoidance structure 71 is arranged on the support connecting column 7, and the second end of the sensor bracket 422 extends to the inside of the avoidance structure 71. Specifically, the support connecting column 7 refers to a columnar component with a certain length, and the cross section of the support connecting column 7 can be circular, rectangular or polygonal. The avoidance structure 71 refers to an open structure for avoiding other components, such as an avoidance groove, an avoidance hole, etc. The avoidance structure 71 can be arranged along the first direction to leave space for the adjustment of the displacement sensor 41. At the same time, a support connecting column 7 is arranged between the driving end of the force loading component 23 and the second clamping component 22, and a avoidance structure 71 is arranged on the support connecting column 7. When the driving end of the force loading component 23 is connected to the second clamping component 22, an installation space can be provided for arranging the displacement sensor 41 on the path along the first direction of the second clamping component 22, so that the displacement sensor 41 can measure the position change of the second clamping component 22 along the first direction more conveniently and quickly.

[0050] In an alternative embodiment, see Figure 2 and Figure 3 The avoidance structure 71 includes an avoidance groove set on the supporting connecting column 7, and the avoidance groove is set through the supporting connecting column 7 along the thickness direction of the supporting connecting column 7, and the avoidance groove is open at one end along the axial direction of the supporting connecting column 7, and the open end of the avoidance groove is set toward the second clamping component 22, thereby avoiding obstruction between the displacement sensor 41 and the second clamping component 22 when the displacement sensor 41 is located inside the avoidance groove, making the measurement of the displacement sensor 41 more convenient and accurate.

[0051] In one embodiment, see Figure 6 The electrical connection mechanism 3 includes a flexible electrode 31 and an electrode driving component 32. The number of the flexible electrodes 31 is two. The two flexible electrodes 31 have the freedom to move along the second direction relative to the main frame 1. The two flexible electrodes 31 are arranged relative to each other, and the electrode driving component 32 is used to drive the two flexible electrodes 31 to move relative to or away from each other. Specifically, the flexible electrode 31 refers to a conductive component with a certain flexibility. The electrode driving component 32 refers to a component or component that can drive an object to move. By arranging the two flexible electrodes 31 relative to each other and respectively located on both sides of the sample 5 after being clamped, when the sample 5 needs to be connected to the external circuit 6, the two flexible electrodes 31 can be driven to move relative to each other by the electrode driving component 32, and until they are both abutted against each other with the electrical connection ends of the sample 5, and when the sample 5 needs to be disconnected from the external circuit 6, the two flexible electrodes 31 are driven to move relative to each other by the electrode driving component 32 to disconnect the sample 5 from the external circuit 6, so that the connection and disconnection of the sample 5 and the external circuit 6 are more convenient.

[0052] In an alternative embodiment, see Figure 6 , the first end of the flexible electrode 31 is connected to the driving end of the electrode driving component 32, and the second end of the flexible electrode 31 is also provided with a bent portion bent toward the other flexible electrode 31. Specifically, the bent portion is formed by bending the second end of the flexible electrode 31, and by providing the bent portion bent toward the other flexible electrode 31 at the second end of the flexible electrode 31, the flexible electrodes 31 can contact the sample 5 through the bent portion after approaching each other, making the contact between the flexible electrode 31 and the sample 5 more convenient.

[0053] In one embodiment, see Figure 6 The electrode driving assembly 32 includes an electrode rail 321, an insulating sliding block 322, an electrode mounting seat 323 and an electrode driving unit 324. The electrode rail 321 is fixed on the main frame 1 and arranged along the second direction. The number of insulating sliding blocks 322 and the electrode mounting seat 323 are both two. The two insulating sliding blocks 322 are both slidably arranged on the electrode rail 321. The electrode driving unit 324 is used to drive the two insulating sliding blocks to move relative to or away from each other along the electrode rail 321, and the two flexible electrodes 31 are both installed on the insulating sliding blocks 322 through the electrode mounting seat 323. Specifically, the electrode rail 321 refers to a rail structure with a certain length. The electrode rail 321 can be arranged along the second direction, wherein the second direction can be perpendicular to the first direction, for example, when the first direction is a vertical direction, the second direction is a horizontal direction. The insulating sliding block 322 refers to an insulating component with a certain volume. The insulating sliding block 322 can be plastic, ceramic or silicone. The electrode mounting seat 323 refers to a component with a certain volume, and a mounting structure for clamping the flexible electrode 31 is usually provided on the electrode mounting seat 323. The electrode driving unit 324 refers to a component or assembly that drives the object to move. The electrode driving unit 324 can be a combination of two cylinders, a combination of two hydraulic cylinders, or a bidirectional electric push rod. The two flexible electrodes 31 are fixedly mounted on the insulating sliding block 322 through the electrode mounting seat 323, respectively. The insulating sliding block 322 is slidably set on the electrode slide rail 321. Finally, the two insulating sliding blocks 322 are driven by the electrode driving unit 324 to move relative to or away from each other, thereby realizing the two flexible electrodes 31 moving away from or close to each other, and at the same time, it can also avoid the phenomenon of short circuit of the flexible electrode 31 when it is connected to the external circuit 6, making the electrode driving component 32 more convenient and safe to use.

[0054] In one embodiment, see Figures 1 to 4, the first direction is the vertical direction, and the second clamping assembly 22 is located below the first clamping assembly 21. Specifically, by arranging the second clamping assembly 22 in the area below the first clamping assembly 21, the sample 5 can also be arranged in the vertical direction, and the sample 5 can be first placed on the second clamping assembly 22 when the sample 5 is clamped, so that the fixation of the sample 5 is more convenient and safe. At the same time, it can also avoid the influence of gravity on the shape of the sample 5, so that the sample 5 is always in a vertical state, making the detection more accurate.

[0055] In one embodiment, see Figure 4 The second clamping assembly 22 includes a pressing head 221, a pressing head base 222 and an elastic member 223. The pressing head 221 is used to abut against the lower end of the sample 5. The pressing head base 222 is arranged below the pressing head 221. The elastic member 223 is arranged between the pressing head base 222 and the pressing head 221 to support the pressing head 221. Specifically, the pressing head 221 and the pressing head base 222 are both block-shaped components with a certain volume. The pressing head 221 and the pressing head base 222 are usually made of components with relatively large rigidity to prevent the pressing head 221 from deforming itself and affecting the measurement result of the sample 5. The elastic member 223 refers to a component with a certain elasticity, such as rubber, and the pressure required for the elastic member 223 to deform to the deformation limit is less than the pressure applied to the sample 5 during the test. At this time, an elastic member 223 is arranged between the pressing head 221 and the pressing head base 222. At the beginning stage when the force loading component 23 applies pressure to the sample 5, the elastic member 223 plays a certain buffering role to avoid damage to the sample 5.

[0056] In an alternative embodiment, see Figure 4 A positioning structure for accommodating the sample 5 is provided on the top surface of the lower pressing head 221. Specifically, the positioning structure refers to a structure that can locate the position of an object, and the positioning structure can be a positioning groove or a positioning hole, etc., which can locate the sample 5 and support it to a certain extent before the sample 5 is clamped by the upper pressing head 211 and the lower pressing head 221, so that the clamping of the sample 5 is more convenient.

[0057] In one embodiment, see Figure 4The first clamping assembly 21 includes an upper pressure head 211 and an upper pressure head base 212. The upper pressure head base 212 is fixedly mounted on the main frame 1. The upper pressure head 211 is arranged on the upper pressure head base 212 and is located directly above the lower pressure head 221. Specifically, the upper pressure head 211 and the upper pressure head base 212 are both components with a certain volume, and the upper pressure head 211 and the upper pressure head base 212 are usually made of components with greater rigidity to avoid deformation of the upper pressure head 211 and the upper pressure head base 212 themselves to affect the measurement result of the sample 5. The upper pressure head 211 is installed on the main frame 1 through the upper pressure head base 212, which can make the installation and fixation of the upper pressure head 211 more convenient and more firmly fixed.

[0058] In a second aspect, a piezoelectric driver testing method is provided, comprising the following steps:

[0059] The sample 5 is placed between the first clamping assembly 21 and the second clamping assembly 22 , and the force loading assembly 23 drives the second clamping assembly 22 to move toward the first clamping assembly 21 , so as to clamp the sample 5 with the test pressure.

[0060] Specifically, when the sample 5 is clamped, the sample 5 is first placed on the second clamping assembly 22, and the force loading assembly 23 drives the second clamping assembly 22 to move toward the first clamping assembly 21 until the sample 5 is clamped.

[0061] The detection end of the displacement detection mechanism 4 is adjusted to zero position, the clamped sample 5 is electrically connected to the external circuit 6 through the electrical connection mechanism 3 , and a test voltage is applied to the sample 5 through the external circuit 6 .

[0062] Specifically, the zero position refers to the position where the detection end of the displacement detection mechanism 4 is at a detection value of zero, and this position can be set according to the size of the sample 5. The two contact ends on the electrical connection mechanism 3 are in contact with the electrical connection end of the sample 5, thereby achieving the purpose of connecting the sample 5 to the external circuit 6.

[0063] Define one of the position value, test voltage value and test pressure value of the second clamping component 22 as the first value, and the other two as the second value and the third value. Keep the value of the first value unchanged, and linearly change the size of one of the second value and the third value. At the same time, record the size change of the other one of the second value and the third value, and calculate the corresponding sample 5 parameters according to the above value changes.

[0064] Specifically, the position of the second clamping assembly 22 can be kept unchanged, and the value of the test voltage applied to the sample 5 can be linearly changed. At the same time, the value of the test pressure output at the sensor is obtained and recorded, so that the voltage-force curve of the sample 5 can be obtained, thereby calculating the blocking force parameters of the sample 5.

[0065] The working state of the force loading component 23 can be controlled to keep the value of the test pressure applied to the sample 5 unchanged, and the value of the test voltage applied to the sample 5 can be linearly changed, and the value of the position change of the second clamping component 22 output by the displacement detection mechanism 4 can be obtained and recorded, so as to obtain the voltage-displacement curve of the sample 5, thereby calculating the maximum displacement parameter of the sample 5. The value of the test voltage applied to the sample 5 can also be kept unchanged, and the value of the test pressure applied to the sample 5 can be linearly changed by controlling the working state of the force loading component 23, and the value of the position change of the second clamping component 22 output by the displacement detection mechanism 4 can be obtained and recorded, so as to obtain the force-displacement curve of the sample 5, thereby calculating the stiffness parameter of the sample 5.

[0066] In the first direction, the force-applying assembly 23 drives the second clamping assembly 22 to move in a direction away from the first clamping assembly 21 , and removes the sample 5 from between the first clamping assembly 21 and the second clamping assembly 22 .

[0067] It can be understood that the beneficial effects of the second aspect mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here.

[0068] Embodiment 1

[0069] The sample 5 to be tested is placed at the center of the pressing head 221 .

[0070] The force loading assembly 23 drives the lower pressing head 221 to rise, and at the same time drives the sample 5 to rise, until the upper end of the sample 5 contacts the upper pressing head and the force sensing unit 24 measures a set value.

[0071] The electrode driving assembly 32 drives the two flexible electrodes 31 to approach each other until the flexible electrodes 31 are in stable contact with the electrical connection ends on both sides of the sample 5 to achieve communication between the sample 5 and the external circuit 6 .

[0072] The displacement detection mechanism 4 is adjusted to a position where the displacement detection mechanism 4 measures a value.

[0073] Keeping the position of the pressing head 221 constant, the external circuit 6 loads the triangular wave voltage at a set speed, collects the voltage value fed back by the position power supply and the force value measured by the force sensing unit until the loading of the triangular wave voltage is completed, and draws the voltage-force curve in the constant displacement mode, and calculates the blocking force of sample 5.

[0074] The force loading assembly 23 drives the pressing head 221 to descend, and after stopping, the sample 5 is removed, and the measurement is finished.

[0075] Embodiment 2

[0076] The sample 5 to be tested is placed at the center of the pressing head 221 .

[0077] The force loading assembly 23 drives the lower pressing head 221 to rise, and at the same time drives the sample 5 to rise, until the upper end of the sample 5 contacts the upper pressing head and the force sensing unit 24 measures a set value.

[0078] The electrode driving assembly 32 drives the two flexible electrodes 31 to approach each other until the flexible electrodes 31 are in stable contact with the electrical connection ends on both sides of the sample 5 to achieve communication between the sample 5 and the external circuit 6 .

[0079] The displacement detection mechanism 4 is adjusted to a position where the displacement detection mechanism 4 measures a value.

[0080] The test pressure applied to both ends of the sample 5 is kept constant by the force loading component 23, and the external circuit 6 loads the triangular wave voltage at a set speed. The displacement value measured by the displacement sensor 41 and the voltage value fed back by the power supply are collected until the triangular wave voltage loading is completed, and the voltage-displacement curve of the sample 5 is drawn, and the maximum displacement is calculated.

[0081] The force loading assembly 23 drives the pressing head 221 to descend, and after stopping, the sample 5 is removed, and the measurement is finished.

[0082] Embodiment 3

[0083] The sample 5 to be tested is placed at the center of the pressing head 221 .

[0084] The force loading assembly 23 drives the lower pressing head 221 to rise, and at the same time drives the sample 5 to rise, until the upper end of the sample 5 contacts the upper pressing head and the force sensing unit 24 measures a set value.

[0085] The electrode driving assembly 32 drives the two flexible electrodes 31 to approach each other until the flexible electrodes 31 are in stable contact with the electrical connection ends on both sides of the sample 5 to achieve communication between the sample 5 and the external circuit 6 .

[0086] The displacement detection mechanism 4 is adjusted to a position where the displacement detection mechanism 4 measures a value.

[0087] The external circuit 6 applies a constant test voltage to the sample 5. The test pressure applied to the sample 5 is changed by the force loading component 23, and the displacement sensor 41 presses the position change value of the head 221 at the same time. The displacement value measured by the displacement sensor 41 and the force value measured by the force sensor are collected until the test pressure loading applied to the sample 5 is completed, and the force-displacement curve in the constant voltage mode is plotted, and the stiffness parameter of the sample 5 is calculated.

[0088] The force loading assembly 23 drives the pressing head 221 to descend, and after stopping, the sample 5 is removed, and the measurement is finished.

[0089] The above are only preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for explaining the principles of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, and other specific implementations of the present invention that can be associated with by technicians in this field without creative labor, should be included in the scope of protection of the present invention.

Claims

1. A piezoelectric actuator testing device, characterized in that: include: Main frame; A clamping force-applying mechanism, the clamping force-applying mechanism comprises a first clamping assembly, a second clamping assembly, a force-applying assembly and a force-sensing unit, the first clamping assembly is fixedly mounted on the main frame, the second clamping assembly has a degree of freedom to move along a first direction relative to the first clamping assembly, the second clamping assembly is used to cooperate with the first clamping assembly to clamp and fix the sample, the driving end of the force-applying assembly is connected to the second clamping assembly, the force-applying assembly is used to drive the second clamping assembly to move along the first direction, the force-sensing unit is arranged between the driving end of the force-applying assembly and the second clamping assembly, and the force-sensing unit is used to detect the thrust applied by the force-applying assembly to the second clamping assembly and the sample, and the reaction force applied by the sample to the second clamping assembly; An electrical connection mechanism, which is disposed on the main frame and is used to electrically connect the clamped sample to an external circuit so as to apply a test voltage to the sample; as well as A displacement detection mechanism is disposed on the main frame and is used to detect the position of the second clamping assembly to monitor the length change of the sample.

2. The piezoelectric actuator testing device according to claim 1, characterized in that: The displacement detection mechanism includes a displacement sensor and an adjustment component, and the adjustment component is arranged between the displacement sensor and the main frame to adjust the relative position between the displacement sensor and the main frame.

3. The piezoelectric actuator testing device according to claim 2, characterized in that: The adjustment assembly includes a displacement base, a sensor bracket and an adjustment drive unit. The displacement base is fixed on the main frame. The first end of the sensor bracket is slidably connected to the displacement base, and the second end extends in a direction close to the second clamping assembly. The displacement sensor is arranged at the second end of the sensor bracket. The adjustment drive unit is arranged on the displacement base, and the driving end of the adjustment drive unit is connected to the sensor bracket for driving the sensor bracket to slide along the first direction.

4. The piezoelectric actuator testing device according to claim 3, characterized in that: A supporting connection column is arranged between the driving end of the force loading assembly and the second clamping assembly, and an avoidance structure is arranged on the supporting connection column. The second end of the sensor bracket extends to the inside of the avoidance structure.

5. The piezoelectric actuator testing device according to claim 1, characterized in that: The electrical connection mechanism includes a flexible electrode and an electrode driving component. There are two flexible electrodes. Both flexible electrodes have the freedom to move along a second direction relative to the main frame. The two flexible electrodes are arranged opposite to each other. The electrode driving component is used to drive the two flexible electrodes to move relative to or away from each other.

6. The piezoelectric actuator testing device according to claim 5, characterized in that: The electrode driving assembly includes an electrode slide rail, an insulating sliding block, an electrode mounting seat and an electrode driving unit. The electrode slide rail is fixed on the main frame and arranged along the second direction. The number of the insulating sliding blocks and the electrode mounting seat is two. Both the insulating sliding blocks are slidably set on the electrode slide rail. The electrode driving unit is used to drive the two insulating sliding blocks to move relative to or away from each other along the electrode slide rail, and the two flexible electrodes are mounted on the insulating sliding blocks through the electrode mounting seat.

7. The piezoelectric actuator testing device according to any one of claims 1 to 6, characterized in that: The first direction is a vertical direction, and the second clamping assembly is located below the first clamping assembly.

8. The piezoelectric actuator testing device according to claim 7, characterized in that: The second clamping assembly includes a pressing head, a pressing head base and an elastic member. The pressing head is used to abut against the lower end of the sample. The pressing head base is arranged below the pressing head. The elastic member is arranged between the pressing head base and the pressing head to support the pressing head.

9. The piezoelectric actuator testing device according to claim 8, characterized in that: The second clamping assembly includes an upper pressing head and an upper pressing head base. The upper pressing head base is fixed on the main frame. The upper pressing head is arranged on the upper pressing head base and is located directly above the lower pressing head.

10. A piezoelectric actuator testing method, characterized in that: The steps include: The sample is placed between the first clamping assembly and the second clamping assembly, and the force loading assembly drives the second clamping assembly to move in a direction close to the first clamping assembly to clamp the sample with a test pressure; Adjust the detection end of the displacement detection mechanism to zero position, electrically connect the clamped sample to the external circuit through the electrical connection mechanism, and apply a test voltage to the sample through the external circuit; One of the position value, the test voltage value and the test pressure value of the second clamping component is defined as the first value, and the other two are the second value and the third value, the value of the first value is kept unchanged, and the magnitude of one of the second value and the third value is linearly changed, and the magnitude change of the other of the second value and the third value is recorded, and the corresponding sample parameter is calculated according to the above value changes; Along the first direction, the force loading assembly drives the second clamping assembly to move in a direction away from the first clamping assembly, and removes the sample from between the first clamping assembly and the second clamping assembly.

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