Experimental device for measuring displacement of circular tube type piezoelectric actuator

Abstract

The utility model provides an experimental device for measuring the displacement of a circular tube type piezoelectric actuator, which relates to the technical field of precise micro-displacement measurement and comprises a base consisting of a bottom plate and a side plate, a circular tube type piezoelectric actuator support, a micro-feeding platform and an inductance measuring head support for placing an inductance measuring head, the circular tube type piezoelectric actuator support is used for positioning one end of the piezoelectric actuator, an arc groove is formed in the top end of the circular tube type piezoelectric actuator support, the circular tube type piezoelectric actuator is placed on the circular tube type piezoelectric actuator support, the inductance measuring head support is installed on the micro-feeding platform, and the inductance measuring head is driven by the micro-feeding platform to move. The problem that a circular tube type piezoelectric actuator is prone to toppling during measurement is solved, and the stability and accuracy of measurement are improved. Meanwhile, the micro-feeding platform is adopted to drive the inductance measuring head to carry out zero setting, the zero setting time is greatly shortened, the measuring efficiency is improved, and the whole experimental device is simple in structure and convenient to operate.

Description

Technical Field

[0001] This utility model relates to the field of precision micro-displacement measurement technology, specifically to an experimental device for measuring the displacement of a circular tube piezoelectric actuator. Background Technology

[0002] Piezoelectric actuators are classified into two types: stacked and cylindrical. In experimental research on precision micro-displacement, measuring the output displacement of piezoelectric actuators under no-load conditions is a crucial step. Stacked piezoelectric actuators, due to their structural characteristics, can be placed on a measuring platform, and their micro-displacement under the action of a driving voltage can be measured using an inductive micrometer. However, cylindrical piezoelectric actuators are much longer than stacked piezoelectric actuators. If placed on a measuring platform for measurement, they are prone to tipping over, making the measurement operation extremely inconvenient. Furthermore, the zeroing process of traditional inductive micrometers is cumbersome and time-consuming, affecting measurement efficiency and experimental progress. Therefore, a specialized experimental device for measuring the displacement of cylindrical piezoelectric actuators is needed to solve these problems. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] To address the shortcomings of existing technologies, this invention provides an experimental device for measuring the displacement of a cylindrical piezoelectric actuator, thereby solving the problems of inconvenient measurement of cylindrical piezoelectric actuators and time-consuming zeroing of inductance measuring instruments in existing technologies, and realizing convenient measurement of the displacement of cylindrical piezoelectric actuators and rapid zeroing of inductance measuring heads.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, this utility model provides the following technical solution: An experimental device for measuring the displacement of a cylindrical piezoelectric actuator, comprising a base consisting of a base plate and side plates, a cylindrical piezoelectric actuator support, a micro-feed platform, and an inductance measuring head support. Adjustment and positioning screws are provided on the side plates. The cylindrical piezoelectric actuator support and the micro-feed platform are located on the upper surface of the base plate on the same side as the side plates. An arc groove is formed at the top of the cylindrical piezoelectric actuator support, on which the cylindrical piezoelectric actuator is placed. An inductance measuring head is mounted on the inductance measuring head support, which is installed on the micro-feed platform. The micro-feed platform drives the inductance measuring head support to move the inductance measuring head horizontally. One end of the cylindrical piezoelectric actuator is positioned by the adjustment and positioning screw. During the experiment, the center lines of the adjustment and positioning screw, the cylindrical piezoelectric actuator, and the inductance measuring head are aligned.

[0007] As a further description of the above technical solution: the micro-displacement generated by the cylindrical piezoelectric actuator after being energized is measured by an inductance measuring head and displayed by a matching digital display inductance micrometer.

[0008] Preferably, the micro-feed platform includes a lower layer, an upper layer, and a knob. The lower layer is T-shaped, and through holes are provided on both sides of the lower layer. Correspondingly, a micro-feed platform mounting hole is provided on the base plate. The micro-feed platform is fixed to the base plate by screws passing through the through holes and mounting the micro-feed platform in the micro-feed platform mounting hole.

[0009] Preferably, the inductance measuring head support includes a mounting plate and a fixing plate. The mounting plate is installed on the micro-feed platform by screws. The fixing plate has an inductance measuring head mounting hole arranged horizontally, through which the inductance measuring head is inserted. The fixing plate has a positioning screw hole, the bottom of which communicates with the inductance measuring head mounting hole. A positioning bolt engages in the positioning screw hole to fix the inductance measuring head.

[0010] Preferably, the central angle corresponding to the arc groove is 120°.

[0011] (III) Beneficial Effects

[0012] This invention provides an experimental apparatus for measuring the displacement of a circular tube-type piezoelectric actuator. It has the following advantages:

[0013] 1. This experimental apparatus for measuring the displacement of a circular tube piezoelectric actuator is simple and practical in structure: The overall structure of this apparatus is rationally designed, the connections between components are clearly defined, it is easy to manufacture and install, and it is convenient to operate. It is suitable for measuring the displacement of a circular tube piezoelectric actuator.

[0014] 2. The experimental apparatus for measuring the displacement of a cylindrical piezoelectric actuator can stably support the cylindrical piezoelectric actuator by setting a support with a circular arc groove with a specific central angle, thus avoiding the problem of the cylindrical piezoelectric actuator tipping over during the measurement process and greatly improving the stability and accuracy of the measurement.

[0015] 3. The experimental device for measuring the displacement of a cylindrical piezoelectric actuator utilizes the movement of a micro-feed platform to drive the inductance measuring head to adjust its displacement. This allows for rapid contact between the inductance measuring head and the end face of the cylindrical piezoelectric actuator, thus completing the zeroing operation. Compared with traditional methods, this significantly shortens the zeroing time and improves experimental efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the experimental apparatus of this utility model;

[0017] Figure 2 This is a schematic diagram of the cylindrical piezoelectric actuator support of this utility model;

[0018] Figure 3 This is a schematic diagram of the inductance measuring head support of this utility model;

[0019] Figure 4 This is a schematic diagram of the micro-feed platform of this utility model;

[0020] Figure 5 This is a schematic diagram of the base of this utility model;

[0021] In the diagram: 1. Adjusting positioning screw; 2. Round tube piezoelectric actuator; 3. Positioning bolt; 4. Inductance measuring head support; 41. Mounting plate; 42. Fixing plate; 43. Inductance measuring head mounting hole; 44. Positioning screw hole; 5. Inductance measuring head; 6. Micro-feed platform; 61. Lower layer; 62. Upper layer; 63. Knob; 7. Base; 71. Base plate; 72. Side plate; 8. Round tube piezoelectric actuator support; 81. Arc groove; 9. Through hole; 10. Micro-feed platform mounting hole. Detailed Implementation

[0022] This utility model embodiment provides an experimental device for measuring the displacement of a circular tube piezoelectric actuator 2, such as... Figure 1-5 As shown, the system includes a base 7 consisting of a base plate 71 and a side plate 72, a cylindrical piezoelectric actuator support 8, a micro-feed platform 6, and an inductance measuring head support 4. An adjusting positioning screw 1 is provided on the side plate 72. The cylindrical piezoelectric actuator support 8 and the micro-feed platform 6 are located on the upper surface of the base plate 71 on the same side as the side plate 72. An arc groove 81 is formed at the top of the cylindrical piezoelectric actuator support 8, on which a cylindrical piezoelectric actuator 2 is placed. An inductance measuring head 5 is placed on the inductance measuring head support 4. The inductance measuring head support 4 is mounted on the micro-feed platform 6. The micro-feed platform 6 drives the inductance measuring head support 4 to move the inductance measuring head 5 horizontally. One end of the cylindrical piezoelectric actuator 2 is positioned by the adjusting positioning screw 1. During the experiment, it is ensured that the center lines of the adjusting positioning screw 1, the cylindrical piezoelectric actuator 2, and the inductance measuring head 5 are aligned.

[0023] As a further description of the above technical solution: the micro-displacement generated by the cylindrical piezoelectric actuator 2 after being energized is measured by the inductance measuring head 5 and displayed by the matching digital display inductance micrometer. The principle of the digital display inductance micrometer for measuring the displacement of the cylindrical piezoelectric actuator 2 is based on the phenomenon of electromagnetic induction and the micro-displacement-electrical signal conversion mechanism, as detailed below:

[0024] Initial state (zeroing)

[0025] Adjust the inductance measuring head 5 by adjusting the micro-feed platform 6 until it gently contacts the right end of the piezoelectric actuator. At this time, the digital display inductance micrometer is set to zero, and the reference position is established.

[0026] The coil of the inductance measuring head 5 and the iron core form a fixed inductance value L0, which corresponds to the initial position when the driver is not powered on.

[0027] Displacement is generated after energization

[0028] When the piezoelectric actuator is energized, it generates a small axial displacement Δx (such as elongation), which drives the iron core of the inductance measuring head 5 to move relative to the coil.

[0029] The displacement of the iron core causes a change in the magnetic reluctance of the coil's magnetic circuit:

[0030] If the iron core moves into the coil, the magnetic resistance decreases and the inductance L increases;

[0031] If the iron core is far away from the coil, the magnetic resistance increases and the inductance L decreases.

[0032] The change in inductance ΔL = L - L0 is linearly or approximately linearly related to the displacement Δx (within the linear range of the sensor).

[0033] Electrical signal conditioning and measurement

[0034] The measurement circuit (such as an AC bridge) inside the digital display inductance micrometer detects the change in inductance value ΔL and converts it into a voltage or current signal ΔU.

[0035] After being amplified and filtered, the signal is converted into a digital signal through analog-to-digital conversion (A / D conversion), and finally displayed directly on the digital display screen in terms of displacement (such as at the micrometer level).

[0036] like Figure 4 As shown, the micro-feed platform 6 includes a lower layer 61, an upper layer 62, and a knob 63. The lower layer 61 is T-shaped, with through holes 9 on both sides. Correspondingly, the base plate 71 has micro-feed platform mounting holes 10. Screws are passed through the through holes 9 and installed in the micro-feed platform mounting holes 10, thus fixing the micro-feed platform 6 to the base plate 71. The micro-feed platform 6 is a current technology, featuring an X-axis knob 63. A dovetail screw feed screw driven by a 60*40mm dovetail groove screw, manufactured by Dongguan Chiyin Transmission Technology Co., Ltd., can be used to drive the dovetail groove type knob 63 micro-adjustment manual slide.

[0037] like Figure 3 As shown, the inductance measuring head support 4 includes a mounting plate 41 and a fixing plate 42. The mounting plate 41 is installed on the micro-feed platform 6 by screws. The fixing plate 42 has an inductance measuring head mounting hole 43 arranged horizontally, through which the inductance measuring head 5 is inserted. The fixing plate 42 has a positioning screw hole 44, the bottom of which is connected to the inductance measuring head mounting hole 43. The positioning screw hole 44 is engaged with a positioning bolt 3 for fixing the inductance measuring head 5.

[0038] like Figure 2 As shown, the central angle corresponding to the arc groove 81 is 120°.

[0039] Other components, such as the inductance measuring head 5 and the digital display inductance micrometer in this case, are existing technologies and can be configured in the market according to experimental needs.

[0040] Working principle: When using this experimental device for measuring the displacement of the cylindrical piezoelectric actuator 2, first place the base 7 on a stable experimental platform, and then install and fix the micro-feed platform 6 and the cylindrical piezoelectric actuator support 8 on the base 7 with screws to ensure a firm installation.

[0041] The cylindrical piezoelectric actuator 2 is placed horizontally within the 120° arc groove 81 of the cylindrical piezoelectric actuator support 8 to ensure its stability. Next, the inductance measuring head 5 is placed in the hole of the inductance measuring head support 4, and then the inductance measuring head support 4 is fixed to the micro-feed platform 6 with screws.

[0042] According to the experimental requirements, move the inductance measuring head 5 close to the right end face of the cylindrical piezoelectric actuator 2, and rotate the positioning bolt 3 to firmly clamp the inductance measuring head 5 onto the inductance measuring head support 4. Then, rotate the adjusting positioning screw 1 until it gently contacts the other end face of the cylindrical piezoelectric actuator 2. Finally, rotate the knob 63 of the micro-feed platform 6, causing the upper layer 62 of the micro-feed platform 6 to slowly move the inductance measuring head support 4 and the inductance measuring head 5 to the left until the measuring head of the inductance measuring head 5 gently contacts the right end face of the cylindrical piezoelectric actuator 2. At this point, the zeroing operation of the inductance measuring head 5 is complete.

[0043] When the cylindrical piezoelectric actuator 2 is powered on, it generates a micro-displacement under the action of the driving voltage. The inductance measuring head 5 transmits the detected displacement signal to the matching digital display inductance micrometer. The digital display inductance micrometer accurately displays the displacement of the cylindrical piezoelectric actuator 2, thereby completing the measurement of the displacement of the cylindrical piezoelectric actuator 2.

[0044] In summary, this invention solves the problem of the cylindrical piezoelectric actuator 2 easily tipping over during measurement by setting up a dedicated cylindrical piezoelectric actuator support 8, thus improving the stability and accuracy of the measurement. Simultaneously, the use of a micro-feed platform 6 to drive the inductance measuring head 5 for zeroing significantly shortens the zeroing time and improves measurement efficiency. The entire experimental device has a simple structure and is easy to operate, providing an effective means for the precise measurement of the displacement of the cylindrical piezoelectric actuator 2.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An experimental apparatus for measuring the displacement of a circular tube-type piezoelectric actuator, characterized in that: The device includes a base (7) consisting of a base plate (71) and a side plate (72), a cylindrical piezoelectric actuator support (8), a micro-feed platform (6), and an inductance measuring head support (4). An adjusting positioning screw (1) is provided on the side plate (72). The cylindrical piezoelectric actuator support (8) and the micro-feed platform (6) are located on the upper surface of the base plate (71) on the same side as the side plate (72). An arc groove (81) is formed at the top of the cylindrical piezoelectric actuator support (8), and a cylindrical piezoelectric actuator is placed in the arc groove (81). A tubular piezoelectric actuator (2) is provided. An inductance measuring head (5) is mounted on the inductance measuring head support (4). The inductance measuring head support (4) is mounted on a micro-feed platform (6). The micro-feed platform (6) drives the inductance measuring head support (4) to move the inductance measuring head (5) horizontally. One end of the tubular piezoelectric actuator (2) is positioned by an adjusting positioning screw (1). During the experiment, the center lines of the adjusting positioning screw (1), the tubular piezoelectric actuator (2), and the inductance measuring head (5) are aligned.

2. The experimental apparatus for measuring the displacement of a circular tube piezoelectric actuator according to claim 1, characterized in that: The micro-displacement generated by the cylindrical piezoelectric actuator (2) after being energized is measured by the inductance measuring head (5) and displayed by the matching digital display inductance micrometer.

3. The experimental apparatus for measuring the displacement of a circular tube piezoelectric actuator according to claim 1, characterized in that: The micro-feed platform (6) includes a lower layer (61), an upper layer (62), and a knob (63). The lower layer (61) is T-shaped, and through holes (9) are provided on both sides of the lower layer (61). The corresponding base plate (71) is provided with micro-feed platform mounting holes (10). The micro-feed platform (6) is fixed on the base plate (71) by screws passing through the through holes (9) and installing it in the micro-feed platform mounting holes (10).

4. The experimental apparatus for measuring the displacement of a circular tube piezoelectric actuator according to claim 3, characterized in that: The inductance measuring head support (4) includes a mounting plate (41) and a fixing plate (42). The mounting plate (41) is installed with the micro-feed platform (6) by screws. The fixing plate (42) has an inductance measuring head mounting hole (43) arranged horizontally, through which the inductance measuring head (5) is inserted. The fixing plate (42) has a positioning screw hole (44) with the bottom of the positioning screw hole (44) communicating with the inductance measuring head mounting hole (43). The positioning screw hole (44) is engaged with a positioning bolt (3) for fixing the inductance measuring head (5).

5. The experimental apparatus for measuring the displacement of a circular tube piezoelectric actuator according to claim 1, characterized in that: The central angle corresponding to the arc groove (81) is 120°.

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