A stacked piezoelectric ceramic displacement and output force testing tool and testing method

Abstract

The present invention proposes a displacement and output force testing tool and a testing method for laminated piezoelectric ceramics, belonging to the field of piezoelectric ceramic testing. This method solves the problem that there is currently no tool that can simultaneously detect the output force and displacement of laminated piezoelectric ceramics, and that the current tool for output force detection of laminated piezoelectric ceramics is not accurate enough to obtain accurate output force. The tool comprises a marble platform, an output force testing tool, and a displacement testing tool. The force sensor of the output force testing tool comprises a laminated piezoelectric ceramic used in the sensor and a strain gauge sensor. The laminated piezoelectric ceramic used in the sensor is made of the same material as the laminated piezoelectric ceramic to be tested, and the strain gauge sensor is attached to the surface of the laminated piezoelectric ceramic used in the sensor. The laser interferometer probe of the displacement testing tool can detect the displacement of the laminated piezoelectric ceramic to be tested. The tool measures the output force of the laminated piezoelectric ceramic to be tested more accurately and can simultaneously detect the displacement and output force of the laminated piezoelectric ceramic to be tested.

Description

Technical Field

[0001] The present invention belongs to the technical field of piezoelectric ceramic detection, and in particular relates to a stacked piezoelectric ceramic displacement and output force testing tool and a testing method. Background Art

[0002] Laminated piezoelectric ceramics are a special type of piezoelectric material, composed of multiple stacked piezoelectric ceramic sheets. They exhibit excellent electromechanical coupling properties. Applying pressure to the surface of a piezoelectric material generates an electric charge, known as the direct piezoelectric effect, also known as the generator or sensor effect, converting mechanical energy into electrical energy. Conversely, when a certain voltage is applied, the inverse piezoelectric effect changes the length of the material, converting electrical energy into mechanical energy. This characteristic is exploited to measure the displacement and output force of piezoelectric ceramics. Laminated piezoelectric ceramics utilize a multilayer structure with a certain amount of prestress between each layer. This structure increases the stiffness and sensitivity of the piezoelectric ceramic, enabling it to generate large displacement and output force even with relatively small external forces. However, there is currently no tooling that can simultaneously measure both output force and displacement of laminated piezoelectric ceramics. Furthermore, existing tooling for force measurement of laminated piezoelectric ceramics is not precise enough to accurately measure output force. Summary of the Invention

[0003] In view of this, in order to solve the problem that there is currently no tooling for simultaneously detecting the output force and displacement of stacked piezoelectric ceramics, and that the current tooling for detecting the output force of stacked piezoelectric ceramics is not accurate enough to obtain accurate output force, the present invention proposes a stacked piezoelectric ceramic displacement and output force testing tooling and a testing method.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A stacked piezoelectric ceramic displacement and output force testing tool, comprising:

[0006] marble platform;

[0007] Output force testing tooling, the output force testing tooling is fixedly set on the marble platform, the output force testing tooling includes a base plate, four columns, an upper pressure plate, a lower pressure plate, a locking structure and a force sensor, the four columns are spaced and fixedly set on the base plate, the four columns are slidably passed through the upper pressure plate and the lower pressure plate, the upper pressure plate is located above the lower pressure plate, the laminated piezoelectric ceramic to be tested is located between the base plate and the lower pressure plate, the force sensor is located between the upper pressure plate and the lower pressure plate, and the locking structure can lock the relative position of the upper pressure plate and the columns; the force sensor includes a laminated piezoelectric ceramic used in the sensor and a strain gauge sensor, the laminated piezoelectric ceramic used in the sensor is made of the same material as the laminated piezoelectric ceramic to be tested, the strain gauge sensor is attached to the surface of the laminated piezoelectric ceramic used in the sensor, and the output force generated by the laminated piezoelectric ceramic to be tested can be transmitted to the strain gauge sensor through the laminated piezoelectric ceramic used in the sensor;

[0008] The displacement test fixture is fixed on a marble platform. The displacement test fixture includes a laser interferometer probe and a bracket for supporting the laser interferometer probe. The laser interferometer probe can detect the displacement of the stacked piezoelectric ceramic to be tested.

[0009] As an optimal solution for the above-mentioned laminated piezoelectric ceramic displacement and output force testing tooling, the bracket includes a base, a vertical guide rail and a clamp. The base is fixedly set on the marble platform, the vertical guide rail is fixed on the base, the vertical guide rail extends along the vertical direction, the clamp is slidably set on the vertical guide rail, and the clamp clamps the laser interferometer probe.

[0010] As a preferred solution for the above-mentioned laminated piezoelectric ceramic displacement and output force testing tooling, the locking structure includes two locking nuts, and the upper ends of the two columns located at diagonal positions are provided with external threads. The locking nuts are screwed to the external threads, and the locking nuts abut against the top of the upper pressure plate.

[0011] As a preferred solution of the above-mentioned laminated piezoelectric ceramic displacement and output force testing tool, the laminated piezoelectric ceramic displacement and output force testing tool also includes a sealed cabinet, which is provided with a marble platform, and the output force testing tool and the displacement testing tool are both located in the sealed cabinet.

[0012] As a preferred solution of the above-mentioned laminated piezoelectric ceramic displacement and output force testing fixture, the laminated piezoelectric ceramic displacement and output force testing fixture also includes an air floating platform, which adopts an air-mud-resistance vibration isolation system and is arranged between the ground and the marble platform.

[0013] As a preferred solution of the above-mentioned laminated piezoelectric ceramic displacement and output force testing fixture, the laminated piezoelectric ceramic displacement and output force testing fixture also includes two first high-density mass blocks, the two ends of one of the first high-density mass blocks are respectively abutted against the laminated piezoelectric ceramic to be tested and the lower pressure plate, and are located below the laser interferometer probe, and the two ends of the other first high-density mass block are respectively abutted against the base plate and the laminated piezoelectric ceramic to be tested.

[0014] As a preferred solution of the above-mentioned laminated piezoelectric ceramic displacement and output force testing fixture, the laminated piezoelectric ceramic displacement and output force testing fixture also includes two second high-density mass blocks, wherein the two ends of one second high-density mass block are respectively abutted against the force sensor and the upper pressure plate, and the two ends of the other second high-density mass block are respectively abutted against the force sensor and the lower pressure plate.

[0015] As a preferred solution of the above-mentioned laminated piezoelectric ceramic displacement and output force testing fixture, the laminated piezoelectric ceramic displacement and output force testing fixture also includes two first linear guides and two second linear guides. The first linear guides and the second linear guides are both cylindrical. The two first linear guides are respectively mounted on two columns located at diagonal positions, and the first linear guides are located between the columns and the lower pressure plate. The two second linear guides are respectively mounted on two columns located at diagonal positions, and the second linear guides are located between the columns and the upper pressure plate.

[0016] As a preferred solution of the above-mentioned laminated piezoelectric ceramic displacement and output force testing fixture, the laminated piezoelectric ceramic displacement and output force testing fixture also includes a computer, which is set on the marble platform, and the strain gauge sensor and the laser interferometer probe are both connected to the computer.

[0017] The present invention also provides a method for testing the displacement and output force of laminated piezoelectric ceramics, which uses the above-mentioned laminated piezoelectric ceramic displacement and output force testing tool, including:

[0018] Apply voltage to the stacked piezoelectric ceramic to be tested;

[0019] The laminated piezoelectric ceramic in the sensor, which is made of the same material as the laminated piezoelectric ceramic to be measured, deforms under the interaction of the downward prestress of the upper pressure plate and the upward stress output by the electrical signal of the laminated piezoelectric ceramic to be measured;

[0020] The strain gauge sensor obtains the output force information of the laminated piezoelectric ceramic to be measured through the deformation of the laminated piezoelectric ceramic inside the sensor.

[0021] Compared with the prior art, the present invention provides a stacked piezoelectric ceramic displacement and output force testing fixture and testing method with the following beneficial effects:

[0022] 1. The present invention provides a fixture and method for testing the displacement and output force of laminated piezoelectric ceramics. The fixture comprises a force sensor composed of a piezoelectric ceramic made of the same material as the laminated piezoelectric ceramic to be tested and a strain gauge sensor. The strain gauge of the strain gauge sensor is attached to the ceramic surface. When a voltage is applied to the laminated piezoelectric ceramic to be tested, the pressure generated by the laminated piezoelectric ceramic to be tested acts on the surface of the laminated piezoelectric ceramic to be tested, causing the laminated piezoelectric ceramic to deform slightly, and the strain gauge also deforms accordingly. The strain gauge sensor then obtains information about the output force of the laminated piezoelectric ceramic to be tested. The laminated piezoelectric ceramic used in the force sensor and the laminated piezoelectric ceramic to be tested are made of the same material, and both exhibit the same deformation under the same pressure, resulting in a measured value that is closest to the true value. This fixture measures the output force of the laminated piezoelectric ceramic to be tested with sufficient accuracy to ensure the accuracy of the measured output force.

[0023] 2. The present invention provides a stacked piezoelectric ceramic displacement and output force testing fixture and testing method. The stacked piezoelectric ceramic displacement and output force testing fixture also includes a displacement test fixture that uses a laser interferometer probe to detect the displacement of the stacked piezoelectric ceramic under test. The laser interferometer is a high-precision, non-contact, real-time, multifunctional, and highly stable measuring instrument. Thus, the stacked piezoelectric ceramic displacement and output force testing fixture can simultaneously detect the displacement and output force of the stacked piezoelectric ceramic under test.

[0024] 3. The present invention provides a stacked piezoelectric ceramic displacement and output force testing tool and a testing method. The stacked piezoelectric ceramic displacement and output force testing tool can slide the upper pressure plate up and down before the locking structure locks the upper pressure plate. After the upper pressure plate applies a set preload force to the force sensor, the position of the upper pressure plate is locked by the locking structure. The stacked piezoelectric ceramics of different sizes and shapes can be measured, and different preload forces can be applied. It is suitable for different stacked piezoelectric ceramics and different measurement requirements.

[0025] 4. The present invention provides a stacked piezoelectric ceramic displacement and output force test fixture and a test method. In the stacked piezoelectric ceramic displacement and output force test fixture, the output force test fixture and the displacement test fixture are set on a marble platform. The marble platform has a high density, a low thermal expansion coefficient and an extremely high hardness. It is not easily affected by environmental factors and has good vibration reduction and vibration absorption performance. The output force test fixture and the displacement test fixture are both located in a sealed cabinet. The sealed cabinet can reduce the interference of the external environment on the test data and reduce measurement errors. The air flotation platform adopts an air-damping mud vibration isolation system, and the air flotation platform is set between the ground and the marble platform. The air flotation platform has a shock-absorbing effect, which prevents the vibration of the road surface caused by people walking or other reasons from being transmitted to the marble platform. The stability and reliability of the stacked piezoelectric ceramic displacement and output force test fixture are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 2. It is a structural schematic diagram of an output force test fixture, a displacement test fixture, and a marble platform of a stacked piezoelectric ceramic displacement and output force test fixture provided by a specific embodiment of the present invention;

[0028] Figure 2 1 is a schematic structural diagram of a tool for testing displacement and output force of laminated piezoelectric ceramics provided in a specific embodiment of the present invention;

[0029] Figure 3 2 is a schematic structural diagram of an output force testing tool for a laminated piezoelectric ceramic displacement and output force testing tool provided by a specific embodiment of the present invention;

[0030] Figure 4 1 is an exploded schematic diagram of an output force testing tool for a laminated piezoelectric ceramic displacement and output force testing tool provided in a specific embodiment of the present invention;

[0031] Figure 5 It is an exploded schematic diagram of a displacement test fixture of a laminated piezoelectric ceramic displacement and output force test fixture provided by a specific embodiment of the present invention.

[0032] In the picture:

[0033] 1. Marble platform;

[0034] 2. The multilayer piezoelectric ceramic to be tested;

[0035] 31. Base plate; 32. Column; 33. Lower pressure plate; 34. Upper pressure plate; 35. Force sensor; 36. Locking nut; 37. Second high-density mass block; 38. First high-density mass block; 39. Second linear guide rail; 30. First linear guide rail;

[0036] 41. Laser interferometer probe; 42. Fixture; 43. Vertical guide rail; 44. Base;

[0037] 5. Sealed cabinet;

[0038] 6. Air flotation platform;

[0039] 7. Computer. DETAILED DESCRIPTION

[0040] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features therein can be combined with each other in the absence of conflict, and the embodiments described are only part of the embodiments of the present invention, not all of the embodiments.

[0041] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0042] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0043] In the description of this embodiment, terms such as "upper," "lower," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0044] See also Figure 1-5The present invention provides a stacked piezoelectric ceramic displacement and output force test fixture and a test method, wherein the stacked piezoelectric ceramic displacement and output force test fixture comprises a marble platform 1, an output force test fixture and a displacement test fixture, wherein the output force test fixture is fixedly arranged on the marble platform 1, and the output force test fixture comprises a base plate 31, four columns 32, an upper pressing plate 34, a lower pressing plate 33, a locking structure and a force sensor 35, wherein the four columns 32 are spaced apart and fixedly arranged on the base plate 31, and the four columns 32 are slidably passed through the upper pressing plate 34 and the lower pressing plate 33, and the upper pressing plate 34 is located above the lower pressing plate 33, and the stacked piezoelectric ceramic 2 to be tested is located between the base plate 31 and the lower pressing plate 33, and the force sensor 35 is fixedly arranged on the base plate 31. 5 is located between the upper pressing plate 34 and the lower pressing plate 33. The locking structure can lock the relative position of the upper pressing plate 34 and the column 32. The force sensor 35 includes a laminated piezoelectric ceramic for the sensor and a strain gauge sensor. The laminated piezoelectric ceramic for the sensor is made of the same material as the laminated piezoelectric ceramic 2 to be tested. The strain gauge sensor is attached to the surface of the laminated piezoelectric ceramic for the sensor. The output force generated by the laminated piezoelectric ceramic 2 to be tested can be transmitted to the strain gauge sensor through the laminated piezoelectric ceramic for the sensor. The displacement test fixture is fixedly set on the marble platform 1. The displacement test fixture includes a laser interferometer probe 41 and a bracket for supporting the laser interferometer probe 41. The laser interferometer probe 41 can detect the displacement of the laminated piezoelectric ceramic 2 to be tested.

[0045] In this piezoelectric ceramic displacement and output force testing fixture, the force sensor 35 is composed of a piezoelectric ceramic for use in the sensor, made of the same material as the piezoelectric ceramic 2 to be tested, and a strain gauge sensor. The strain gauge of the strain gauge sensor is attached to the ceramic surface. When a voltage is applied to the piezoelectric ceramic 2 to be tested, the pressure generated by the piezoelectric ceramic 2 acts on the surface of the piezoelectric ceramic for use in the sensor, causing the piezoelectric ceramic to slightly deform, which in turn causes the strain gauge to deform. The strain gauge sensor then obtains information about the output force of the piezoelectric ceramic 2 to be tested. Because the piezoelectric ceramic for use in the force sensor 35 and the piezoelectric ceramic 2 to be tested are made of the same material, they deform identically under the same pressure, resulting in a measured value that is closest to the true value. This piezoelectric ceramic displacement and output force testing fixture provides sufficient precision in measuring the output force of the piezoelectric ceramic 2 to ensure the accuracy of the measured output force.

[0046] The stacked piezoelectric ceramic displacement and output force testing fixture also includes a displacement test fixture that uses a laser interferometer probe 41 to detect the displacement of the stacked piezoelectric ceramic 2 under test. The laser interferometer is a high-precision, non-contact, real-time, multifunctional, and highly stable measuring instrument. Thus, the stacked piezoelectric ceramic displacement and output force testing fixture can simultaneously detect the displacement and output force of the stacked piezoelectric ceramic 2 under test.

[0047] The stacked piezoelectric ceramic displacement and output force testing fixture has four columns 32 fixedly mounted on the base plate 31. In this embodiment, the four columns 32 are distributed at the four corners of the rectangle. The upper pressing plate 34 and the lower pressing plate 33 are both mounted on the four columns 32. It can be understood that the four columns 32 are located at the four corners of the upper pressing plate 34 and the four corners of the lower pressing plate 33, which can improve stability and reliability. Before the locking structure locks the upper pressing plate 34, the upper pressing plate 34 can slide up and down. After the set preload force is applied to the force sensor 35 by the upper pressing plate 34, the position of the upper pressing plate 34 is locked by the locking structure. This allows the measurement of stacked piezoelectric ceramics of different sizes and shapes, and can also apply different preload forces. It is suitable for different stacked piezoelectric ceramics and different measurement requirements. Moreover, the output force test fixture and the displacement test fixture are set on the marble platform 1. The marble platform 1 has a high density, a low thermal expansion coefficient and an extremely high hardness. It is not easily affected by environmental factors and has good vibration reduction and absorption performance. It can further improve the stability and reliability of the stacked piezoelectric ceramic displacement and output force test fixture.

[0048] Optionally, the locking structure includes two locking nuts 36. The upper ends of the two diagonally opposite columns 32 are each provided with external threads. The locking nuts 36 are threadedly engaged with the external threads and abut against the upper surface of the upper pressure plate 34. When the upper pressure plate 34 moves downward to the target position, the pressure exerted by the upper pressure plate 34 on the force sensor 35 reaches a set preload force. The locking nuts 36 are rotated until they abut against the upper pressure plate 34, thereby fixing the relative position of the upper pressure plate 34 and the columns 32.

[0049] Optionally, the laminated piezoelectric ceramic displacement and output force test fixture further includes a sealed cabinet 5, which is provided with a marble platform 1. Both the output force test fixture and the displacement test fixture are located within the sealed cabinet 5. The sealed cabinet 5 can reduce external environmental interference with the test data and reduce measurement errors. In this embodiment, the sealed cabinet 5 is made of aluminum plate.

[0050] Optionally, the stacked piezoelectric ceramic displacement and output force testing tool further includes an air bearing platform 6, which utilizes an air-sludge vibration isolation system and is positioned between the ground and the marble platform 1. Air bearing platform 6 provides a shock-absorbing effect, preventing vibrations from the road surface, such as those caused by human movement or other factors, from being transmitted to the marble platform 1.

[0051] Optionally, the stacked piezoelectric ceramic displacement and output force testing fixture also includes two first high-density mass blocks 38, the two ends of one first high-density mass block 38 respectively abut against the stacked piezoelectric ceramic 2 to be tested and the lower pressure plate 33, and are located below the laser interferometer probe 41, and the two ends of the other first high-density mass block 38 respectively abut against the base plate 31 and the stacked piezoelectric ceramic 2 to be tested.

[0052] Optionally, the stacked piezoelectric ceramic displacement and output force test fixture also includes two second high-density mass blocks 37. The two ends of one second high-density mass block 37 abut the force sensor 35 and the upper platen 34, respectively. The two ends of the other second high-density mass block 37 abut the force sensor 35 and the lower platen 33, respectively. The high density of the first and second high-density mass blocks 38 and 37 allows for precise transmission of the deformation of the stacked piezoelectric ceramic 2 to the stacked piezoelectric ceramic within the sensor.

[0053] Optionally, the bracket includes a base 44, a vertical guide rail 43, and a clamp 42. The base 44 is fixedly mounted on the marble platform 1. The vertical guide rail 43 is fixedly mounted on the base 44 and extends in a vertical direction. The clamp 42 is slidably mounted on the vertical guide rail 43 and clamps the laser interferometer probe 41. By sliding the clamp 42 on the vertical guide rail 43, the distance between the laser interferometer probe 41 and the first high-density mass block 38 can be adjusted. The displacement of the stacked piezoelectric ceramic 2 to be measured can be obtained by detecting the displacement of the first high-density mass block 38.

[0054] Optionally, the laminated piezoelectric ceramic displacement and output force testing fixture further includes two first linear guides 30 and two second linear guides 39, both of which are cylindrical. The two first linear guides 30 are respectively sleeved on two columns 32 located at diagonal positions, and the first linear guides 30 are located between the columns 32 and the lower pressure plate 33. The two second linear guides 39 are respectively sleeved on two columns 32 located at diagonal positions, and the second linear guides 39 are located between the columns 32 and the upper pressure plate 34. It can be understood that the lower pressure plate 33 and the upper pressure plate 34 slide on the outer walls of the first linear guides 30 and the second linear guides 39, respectively, to ensure that the upper pressure plate 34 and the lower pressure plate 33 slide up and down along a straight line.

[0055] Optionally, the stacked piezoelectric ceramic displacement and output force testing tool further includes a computer 7 , which is disposed on the marble platform 1 , and the strain gauge sensor and the laser interferometer probe 41 are both connected to the computer 7 .

[0056] In this embodiment, the upright column 32 , the bottom plate 31 , the upper pressing plate 34 and the lower pressing plate 33 are made of carbon steel.

[0057] The present invention also provides a method for testing the displacement and output force of laminated piezoelectric ceramics, which uses the above-mentioned laminated piezoelectric ceramic displacement and output force testing tool, including:

[0058] A voltage is applied to the laminated piezoelectric ceramic 2 to be measured; the laminated piezoelectric ceramic in the sensor, which is made of the same material as the laminated piezoelectric ceramic 2 to be measured, deforms under the interaction of the downward prestress of the upper pressure plate 34 and the upward stress output by the electrical signal of the laminated piezoelectric ceramic 2 to be measured; the strain gauge sensor obtains the output force information of the laminated piezoelectric ceramic 2 to be measured through the deformation of the laminated piezoelectric ceramic in the sensor.

[0059] The force sensor 35 consists of a piezoelectric ceramic layer within the sensor, made of the same material as the piezoelectric ceramic 2 being measured, and a strain gauge sensor. Pressure acts directly on the surface of the piezoelectric ceramic layer within the sensor, producing a slight deformation. The strain gauges are attached to the ceramic surface and connected to form a Wheatstone bridge (closed bridge). Due to the piezoresistance effect of the piezoresistors, the bridge generates a highly linear voltage signal that is proportional to the pressure and also proportional to the excitation voltage. The output force of the piezoelectric ceramic 2 being measured can be obtained using a calibrated voltage-output force relationship table. This voltage-output force relationship table is obtained through multiple calibration tests. The standard voltage signal is calibrated to 2.0 / 3.0 / 3.3mV, etc., depending on the pressure range. Calibrated with a weight, the sensor exhibits high temperature and time stability. The sensor has built-in temperature compensation from 0 to 70°C and can withstand direct contact with most media.

[0060] Obviously, the embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The embodiments do not describe all details in detail, nor do they limit the invention to the specific embodiments described. Numerous modifications and variations are possible based on the contents of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. It is not necessary and impossible to list all embodiments here.

Claims

1. A stacked piezoelectric ceramic displacement and output force testing tool, characterized in that: include: Marble platform (1); The output force testing tool is fixedly arranged on a marble platform (1). The output force testing tool comprises a base plate (31), four columns (32), an upper pressing plate (34), a lower pressing plate (33), a locking structure and a force sensor (35). The four columns (32) are arranged at intervals and are all fixedly arranged on the base plate (31). The four columns (32) are all slidably penetrated through the upper pressing plate (34) and the lower pressing plate (33). The upper pressing plate (34) is located above the lower pressing plate (33). The laminated piezoelectric ceramic (2) to be tested is located between the base plate (31) and the lower pressing plate (33). The force sensor (35) is located above the upper pressing plate (34). Between the plate (34) and the lower pressing plate (33), a locking structure can lock the relative position of the upper pressing plate (34) and the column (32); the force sensor (35) includes a laminated piezoelectric ceramic used in the sensor and a strain gauge sensor, the laminated piezoelectric ceramic used in the sensor and the laminated piezoelectric ceramic (2) to be measured are made of the same material, and the laminated piezoelectric ceramic used in the sensor and the laminated piezoelectric ceramic (2) to be measured have the same deformation amount under the same pressure, the strain gauge sensor is attached to the surface of the laminated piezoelectric ceramic used in the sensor, and the output force generated by the laminated piezoelectric ceramic (2) to be measured can be transmitted to the strain gauge sensor through the laminated piezoelectric ceramic used in the sensor; A displacement test fixture is fixedly arranged on a marble platform (1). The displacement test fixture comprises a laser interferometer probe (41) and a bracket for supporting the laser interferometer probe (41). The laser interferometer probe (41) can detect the displacement of the laminated piezoelectric ceramic (2) to be tested.

2. The stacked piezoelectric ceramic displacement and output force testing tool according to claim 1, characterized in that: The bracket comprises a base (44), a vertical guide rail (43) and a clamp (42), wherein the base (44) is fixedly arranged on the marble platform (1), the vertical guide rail (43) is fixedly arranged on the base (44), the vertical guide rail (43) extends in a vertical direction, the clamp (42) is slidably arranged on the vertical guide rail (43), and the clamp (42) clamps the laser interferometer probe (41).

3. The stacked piezoelectric ceramic displacement and output force testing tool according to claim 1, characterized in that: The locking structure includes two locking nuts (36). The upper ends of the two upright posts (32) at diagonal positions are both provided with external threads. The locking nuts (36) are screwed to the external threads and abut against the upper surface of the upper pressing plate (34).

4. The stacked piezoelectric ceramic displacement and output force testing tool according to claim 1, characterized in that: It also includes a sealed cabinet (5), which is provided with a marble platform (1), and the output force test tool and the displacement test tool are both located in the sealed cabinet (5).

5. The stacked piezoelectric ceramic displacement and output force testing tool according to claim 1, characterized in that: It also includes an air-floating platform (6), which adopts an air-blocking mud vibration isolation system. The air-floating platform (6) is arranged between the ground and the marble platform (1).

6. The stacked piezoelectric ceramic displacement and output force testing tool according to claim 1, characterized in that: The invention also includes two first high-density mass blocks (38), wherein two ends of one first high-density mass block (38) respectively abut against the laminated piezoelectric ceramic (2) to be measured and the lower pressing plate (33), and is located below the laser interferometer probe (41), and two ends of the other first high-density mass block (38) respectively abut against the bottom plate (31) and the laminated piezoelectric ceramic (2) to be measured.

7. The stacked piezoelectric ceramic displacement and output force testing tool according to claim 1, characterized in that: It also includes two second high-density mass blocks (37), wherein two ends of one second high-density mass block (37) respectively abut against the force sensor (35) and the upper pressing plate (34), and two ends of the other second high-density mass block (37) respectively abut against the force sensor (35) and the lower pressing plate (33).

8. The stacked piezoelectric ceramic displacement and output force testing tool according to claim 1, characterized in that: The invention also includes two first linear guide rails (30) and two second linear guide rails (39), wherein the first linear guide rails (30) and the second linear guide rails (39) are both cylindrical, and the two first linear guide rails (30) are respectively sleeved on two columns (32) located at diagonal positions, and the first linear guide rails (30) are located between the columns (32) and the lower pressing plate (33), and the two second linear guide rails (39) are respectively sleeved on the two columns (32) located at diagonal positions, and the second linear guide rails (39) are located between the columns (32) and the upper pressing plate (34).

9. The stacked piezoelectric ceramic displacement and output force testing tool according to claim 1, characterized in that: The device further comprises a computer (7), which is arranged on the marble platform (1), and the strain gauge sensor and the laser interferometer probe (41) are both connected to the computer (7).

10. A method for testing displacement and output force of laminated piezoelectric ceramics, characterized in that: The displacement and output force testing fixture of the laminated piezoelectric ceramics according to any one of claims 1 to 9 comprises: Applying a voltage to the stacked piezoelectric ceramic (2) to be tested; The laminated piezoelectric ceramic in the sensor, which is made of the same material as the laminated piezoelectric ceramic (2) to be measured, deforms under the interaction of the downward prestress of the upper pressure plate (34) and the upward stress outputted by the electrical signal of the laminated piezoelectric ceramic (2) to be measured; The strain gauge sensor obtains output force information of the laminated piezoelectric ceramic (2) to be measured through the deformation of the laminated piezoelectric ceramic in the sensor.

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