CN114354022B - Output testing system and method of piezoelectric driver - Google Patents
Output testing system and method of piezoelectric driver Download PDFInfo
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Abstract
The invention relates to a system and a method for testing the output force of a piezoelectric driver, wherein the system for testing the output force comprises: the vibration isolator comprises a clamping system, a force measuring system, a displacement acquisition system, a displacement reading system, a driving system and a vibration isolation platform, wherein the clamping system is used for applying different forces to an electric driver to be tested, and the clamping system is positioned on the vibration isolation platform; the force measuring system is used for reading the clamping force; the driving system is connected with the piezoelectric driver to be tested and is used for inputting forward direct-current voltage to the piezoelectric driver to be tested, and the piezoelectric driver to be tested moves after receiving different driving voltages of the driving system, so that a moving platform in the clamping system is driven to move; the displacement acquisition system is used for measuring linkage movement displacement of the moving platform in the clamping system due to the piezoelectric driver to be tested; the displacement reading system is used for reading displacement data, and if the piezoelectric driver generates zero displacement or reverse displacement under a certain force, the force is the maximum output force value of the piezoelectric driver.
Description
Technical Field
The invention relates to the field of mechanical testing of piezoelectric material devices, in particular to a system and a method for testing the output force of a piezoelectric driver.
Background
Piezoelectric actuators are widely used in the field of precision machinery, and particularly in the field of precision motion platforms, which are key components in the field of precision robots, such as precision machinery, ultra-precision machining, precision optics, precision measurement, and the like. Therefore, high precision, large output and large stroke piezoelectric actuators are the main research directions at present.
The performance of the piezoelectric actuator determines the final precision of the precision micro-displacement platform, as compared to other actuators on the market, such as: electromagnetic driver, pneumatic and hydraulic driver, etc., the piezoelectric driver can realize the nanometer precision, and is small, simple in construction and easy to operate. The piezoelectric driver converts electric energy into mechanical energy by utilizing the inverse piezoelectric effect, and has wide application prospect.
The output of the piezoelectric actuator is an important index for evaluating the piezoelectric actuator, and a reliable and accurate evaluation method does not exist at present.
Disclosure of Invention
Aiming at the problem of large output measurement error of a piezoelectric driver in the prior art, the invention provides a system and a method for testing the output of the piezoelectric driver. The output test system and the test method provided by the invention can effectively and accurately measure the output of the stack, and are simple to operate.
The aim of the invention can be achieved by the following technical scheme:
the invention provides an output test system of a piezoelectric driver, which comprises: the device comprises a clamping system, a force measuring system, a displacement acquisition system, a displacement reading system, a driving system and a vibration isolation platform,
the clamping system is used for clamping the piezoelectric driver to be tested, applying different forces to the piezoelectric driver to be tested, and is positioned on the vibration isolation platform;
the force measuring system is used for reading the clamping force applied by the clamping system to the piezoelectric driver;
the driving system is arranged outside the clamping system and connected with the piezoelectric driver to be tested, and is used for inputting forward direct voltage to the piezoelectric driver to be tested, and the piezoelectric driver to be tested moves after being subjected to different driving voltages of the driving system, so that a moving platform in the clamping system is driven to move;
the displacement acquisition system is positioned outside the clamping system and is used for measuring linkage movement displacement of the motion platform in the clamping system due to the piezoelectric driver to be tested;
the displacement reading system is connected with the displacement acquisition system and is used for reading the displacement data acquired by the displacement acquisition system, and if the piezoelectric driver generates zero displacement or reverse displacement under a certain force application, the force is the maximum output value of the piezoelectric driver.
In one embodiment of the present invention, the vibration isolation platform needs to have a good vibration isolation performance, and the deck plate of the vibration isolation platform is a honeycomb plate. When the vibration isolation platform is used, the base of the clamping system is fixed on the deck plate of the vibration isolation platform by bolts.
In one embodiment of the invention, the clamping system comprises a base, a guide rod, a motion platform, a pressing plate, a top plate, a screw rod and a handle,
the guide rod is provided with four guide rods, the lower ends of the guide rods are connected to the base, the upper ends of the guide rods are connected to the top plate, the moving platform and the pressing plate are sleeved on the guide rods and can move up and down along the guide rods, the moving platform is used for placing a piezoelectric driver to be tested, the screw rod penetrates through the top plate and is used for pushing the pressing plate to move downwards and applying force to the piezoelectric driver to be tested, the force measuring system is located below the moving platform, and the handle is connected to the screw rod and is used for rotating the screw rod to realize downward movement of the pressing plate.
In one embodiment of the invention, the top plate is in threaded connection with the screw.
The pressure is applied by rotating the handle, so that the pressing plate moves downwards and presses on the piezoelectric driver, and the motion platform is used for placing the piezoelectric driver and transmitting the applied force to the force measuring system.
In one embodiment of the invention, an adjusting block is arranged on the motion platform, and the adjusting block is used for placing the piezoelectric driver to be tested. The adjusting block can be selected according to piezoelectric drivers with different shapes and sizes, and is provided with square grooves, round grooves and adjusting blocks without grooves with different sizes, the sizes of the grooves are determined according to the section sizes of the piezoelectric drivers, the tolerance is within 0.05mm, and the adjusting blocks are embedded in the center of the motion platform.
In one embodiment of the invention, the force measuring system comprises a spring, a force sensor and a display, wherein the spring is positioned at the lower part of the clamping system, the upper end of the spring is connected with the moving platform of the clamping system, the lower end of the spring is connected with the force sensor, the signal wire is led out of the force sensor and connected with the display, the spring deforms in the downward movement process of the moving platform of the clamping system, pressure is generated, and the force sensor displays the force applied at the moment after the force sensor is stressed.
In one embodiment of the invention, the selection of the springs can be adjusted according to the force measuring range. The use of a spring allows the piezoelectric actuator to be fixed at one end and free at the other end.
In one embodiment of the invention, the displacement acquisition system is composed of a laser displacement sensor and a laser displacement sensor adjusting device, wherein the laser displacement sensor adjusting device is used for adjusting the position of the laser displacement sensor, the laser displacement sensor is positioned above a platform moving part of the clamping system and used for striking a laser spot on a moving platform in the clamping system, and when the moving platform in the clamping system moves, the laser spot of the laser displacement sensor changes, so that the laser displacement sensor can calculate the movement displacement of the laser spot.
In one embodiment of the invention, the laser displacement sensor is connected to a power supply for driving the laser displacement sensor. In some embodiments, the power source is a 24V dc power source.
In one embodiment of the present invention, the laser displacement sensor is a triangular reflection sensor.
In one embodiment of the invention, the displacement reading system is a computer with built-in software matched with a laser displacement sensor, the displacement data detected by the laser displacement sensor is input into the software matched with the laser displacement sensor, and the displacement generated by the corresponding piezoelectric driver to be detected is read out through the computer software.
When the laser displacement sensor is used, the position of the laser point is adjusted through the laser displacement sensor adjusting device, so that the indicator lamp of the laser displacement sensor is changed into a double-yellow lamp, and the displacement value detected by the laser displacement sensor is displayed on a computer through self-contained software.
In one embodiment of the invention, the driving system comprises a direct current driving power supply and a connecting wire, wherein the positive electrode and the negative electrode of the wire are connected with the positive electrode and the negative electrode of the piezoelectric driver, and the displacement of the piezoelectric driver under the voltage is obtained by adjusting different voltages of the direct current driving power supply.
The invention also provides a method for testing the output of the piezoelectric driver, which is performed based on the output testing system of the piezoelectric driver and comprises the following steps:
firstly, selecting an adjusting block which accords with the section shape of a piezoelectric driver to be tested, loading the adjusting block onto a moving platform of a clamping system, fastening and connecting a base of the clamping system and a vibration isolation platform by bolts, loading the piezoelectric driver to be tested into the clamping system, and ensuring that the bottom surface of a sample to be tested is tightly attached to the plane of the adjusting block, wherein a force application point is required to be positioned on the central axis of the sample to be tested;
step two, after the sample to be measured is firmly clamped in the clamping system, lifting a pressing plate of the clamping system, after the load of the sample to be measured is zero, carrying out zero setting operation on a force sensor of the force measuring system, then placing the pressing plate on the sample to be measured, readjusting the position of the sample to be measured, ensuring that the sample to be measured is not warped, slowly rotating a handle of the clamping system, enabling force application to be uniformly applied on the sample to be measured, observing a numerical value on a display connected with the force sensor, stopping force application when the target value is reached, and locking the position;
step three, adjusting the position of a laser displacement sensor of a displacement testing system, striking a laser spot at the protruding position of a moving platform of a clamping system, continuously adjusting the height of the laser displacement sensor, enabling an indicator lamp of the laser displacement sensor to be a double-yellow lamp or a correct measuring position, and performing zero setting operation on the laser displacement sensor;
and fourthly, connecting a power supply of the driving system with a positive and negative electrode driving line of the sample to be measured, adjusting the voltage value of the direct current power supply to a target value, observing a displacement value displayed by software of the laser displacement sensor, if the displacement value is larger than zero, returning the driving voltage to 0V, and continuously adjusting the pressure value until the displacement value is zero after full-voltage driving, wherein the force application value at the moment is the maximum output value of the sample to be measured.
In one embodiment of the present invention, in the fourth step, the forward direct current voltage is in a range of 0 to 150V, the change increment of the forward direct current voltage is arbitrary, the force application range is in a range of 0 to 2000N, and the force value change increment is arbitrary.
Compared with the prior art, the invention has the following advantages:
1) The non-contact measurement is carried out through the laser displacement sensor, so that the displacement measurement is more accurate, and the device is simpler;
2) According to the invention, external vibration is isolated through the vibration isolation platform, so that the influence of environmental vibration on displacement measurement is reduced;
3) According to the invention, through the design of the clamping system and the matching of the adjusting blocks, the processing cost of the test fixture is reduced, and the test of the output value and displacement of the piezoelectric driver with various cross-sectional shapes can be matched.
Drawings
Fig. 1 is a schematic structural diagram of an output testing system of a piezoelectric driver in embodiment 1;
fig. 2 is a schematic diagram of a combination structure of a clamping system and a force sensor in a force testing system of a piezoelectric actuator in embodiment 1.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples.
Example 1
Referring to fig. 1 and 2, the present embodiment provides an output testing system of a piezoelectric driver, which includes: a clamping system 10, a force measuring system 20, a displacement acquisition system 30, a displacement reading system 40, a driving system 50 and a vibration isolation platform 60,
the clamping system 10 is used for clamping the piezoelectric driver 1 to be tested, different forces are applied to the piezoelectric driver 1 to be tested, and the clamping system 10 is positioned on the vibration isolation platform 60;
the force measuring system 20 is used for reading the clamping force applied by the clamping system 10 to the piezoelectric driver 1;
the driving system 50 is arranged outside the clamping system 10 and connected with the piezoelectric driver 1 to be tested, and is used for inputting a forward direct voltage to the piezoelectric driver 1 to be tested, and the piezoelectric driver 1 to be tested moves after being subjected to different driving voltages of the driving system 50, so that a moving platform in the clamping system 10 is driven to move;
the displacement acquisition system 30 is positioned outside the clamping system 10 and is used for measuring the linkage movement displacement of the motion platform in the clamping system 10 due to the piezoelectric driver 1 to be tested;
the displacement reading system 40 is connected with the displacement acquisition system 30, and is used for reading displacement data acquired by the displacement acquisition system 30, and if the piezoelectric driver generates zero displacement or reverse displacement under a certain force application, the force is the maximum output value of the piezoelectric driver;
in this embodiment, the vibration isolation platform 60 needs to have a better vibration isolation performance, and the deck plate of the vibration isolation platform 60 is a honeycomb plate. In use, the base of the clamping system 10 is secured to the deck plate of the vibration isolation platform 60 using bolts.
In this embodiment, the clamping system 10 includes a base 101, a guide rod 102, a moving platform 103, a pressing plate 104, a top plate 105, screws 106 and a handle 107, where the four guide rods 102 are disposed, the lower ends of the four guide rods are connected to the base 101, the upper ends of the four guide rods are connected to the top plate 105, the moving platform 103 and the pressing plate 104 are both sleeved on the guide rod 102 and can move up and down along the guide rod 102, the moving platform 103 is used for placing the piezoelectric driver 1 to be tested, the screws 106 penetrate through the top plate 105 and are used for pushing the pressing plate 104 to move down and apply force to the piezoelectric driver 1 to be tested, the force measuring system 20 is located below the moving platform 103, and the handle 107 is connected to the screws 106 and is used for rotating the screws 106 to realize the downward movement of the pressing plate 104. In this embodiment, the top plate 105 is in threaded connection with the screw 106. By applying pressure by rotating the handle 107, a downward movement of the pressure plate 104 is achieved, pressing against the piezo-electric drive, the motion platform 103 being used to place the piezo-electric drive and to transfer the applied force to the force measuring system 20.
In this embodiment, an adjusting block 108 is disposed on the motion platform 103, and the adjusting block 108 is used for placing the piezoelectric actuator 1 to be tested. The adjusting block can be selected according to piezoelectric drivers with different shapes and sizes, and is provided with square grooves, round grooves and adjusting blocks without grooves with different sizes, the sizes of the grooves are determined according to the section sizes of the piezoelectric drivers, the tolerance is within 0.05mm, and the adjusting blocks are embedded in the center of the motion platform 103.
In this embodiment, the force measuring system 20 includes a spring, a force sensor and a display, where the spring is located at the lower part of the clamping system 10, and the upper end of the spring is connected to the moving platform of the clamping system 10, the lower end of the spring is connected to the force sensor, the force sensor draws out a signal line and is connected to the display, the spring deforms in the downward movement process of the moving platform of the clamping system 10, pressure is generated, and after the force sensor receives the pressure, the display displays the magnitude of the applied force at this time. The selection of the spring can be adjusted according to the force measuring range. The use of a spring allows the piezoelectric actuator to be fixed at one end and free at the other end.
In this embodiment, the displacement acquisition system 30 is composed of a laser displacement sensor and a laser displacement sensor adjusting device, the laser displacement sensor adjusting device is used for adjusting the position of the laser displacement sensor, the laser displacement sensor is located above the platform moving component of the clamping system 10, the laser displacement sensor is used for striking a laser spot on the moving platform in the clamping system 10, and when the moving platform in the clamping system 10 moves, the laser spot of the laser displacement sensor changes, so that the laser displacement sensor can calculate the movement displacement of the laser spot. The laser displacement sensor is connected with a power supply, and the power supply is used for driving the laser displacement sensor. In some embodiments, the power source is a 24V dc power source. In this embodiment, the laser displacement sensor is a triangular reflection sensor.
In this embodiment, the displacement reading system 40 is a computer with built-in software matched with a laser displacement sensor, the displacement data detected by the laser displacement sensor is input into the software matched with the laser displacement sensor, and the displacement generated by the piezoelectric driver to be tested is read out through the computer software.
When the laser displacement sensor is used, the position of the laser point is adjusted through the laser displacement sensor adjusting device, so that the indicator lamp of the laser displacement sensor is changed into a double-yellow lamp, and the displacement value detected by the laser displacement sensor is displayed on a computer through self-contained software.
In this embodiment, the driving system 50 includes a dc driving power source and a connection wire, where the positive and negative electrodes of the wire are connected to the positive and negative electrodes of the piezoelectric driver, and the displacement of the piezoelectric driver 1 under the voltage is obtained by adjusting different voltages of the dc driving power source. The drive system 50 can be adjusted steplessly from 0 to 150V, and the output voltage end is connected with a red and black drive wire of a sample of which one end is a red and black double-head crocodile clip and a piezoelectric driver to be tested.
The embodiment also provides a method for testing the output of the piezoelectric driver, which is performed based on the output testing system of the piezoelectric driver and comprises the following steps:
firstly, selecting an adjusting block which accords with the section shape of a piezoelectric driver to be tested, loading the adjusting block onto a moving platform of a clamping system, fastening and connecting a base of the clamping system and a vibration isolation platform by bolts, loading the piezoelectric driver to be tested into the clamping system, ensuring that the bottom surface of a sample to be tested is tightly attached to the plane of the adjusting block, preventing warping, and ensuring that a force application point is positioned on the central axis of the sample to be tested, so that shearing force is prevented from being generated due to force application, and the shearing force can greatly influence the test result;
step two, after the sample to be measured is firmly clamped in the clamping system, slightly lifting a pressing plate of the clamping system, so that the load of the sample to be measured is zero, carrying out zero setting operation on a force sensor of the force measuring system, slightly and slowly placing the pressing plate on the sample to be measured, readjusting the position of the sample to be measured, ensuring that the sample to be measured is free from warping and cannot be subjected to shearing force, slowly rotating a handle of the clamping system, uniformly applying force on the sample to be measured, observing a numerical value on a display connected with the force sensor, stopping applying force after reaching a target value, and locking the position;
step three, adjusting the position of a laser displacement sensor of a displacement testing system, striking a laser spot at the protruding position of a moving platform of a clamping system, continuously adjusting the height of the laser displacement sensor, enabling an indicator lamp of the laser displacement sensor to be a double-yellow lamp or a correct measuring position, and performing zero setting operation on the laser displacement sensor;
and fourthly, connecting a double-end crocodile clamp led out by a power supply of a driving system with a positive and negative electrode driving line of a sample to be tested, adjusting the voltage value of a direct current power supply to a target value, observing a displacement value displayed by software of the laser displacement sensor, if the displacement value is larger than zero, returning the driving voltage to 0V, and continuously adjusting the pressure value until the displacement value is zero after full-voltage driving, wherein the force application value is the maximum force output value of the sample to be tested.
In the fourth step, the range of the forward direct voltage is 0-150V, the change increment of the forward direct voltage is arbitrary, the range of the force application is 0-2000N, and the change increment of the force value is arbitrary.
Example 2
The embodiment provides a method for testing the output force of a piezoelectric driver (square piezoelectric stack), which is based on the system of embodiment 1 and specifically comprises the following steps:
the method comprises the steps of (1) selecting an adjusting block with a square groove, loading the adjusting block on a platform of a clamping system, fastening and connecting a base of the clamping system with a vibration isolation platform by using bolts, loading a piezoelectric driver to be tested into the clamping system, ensuring that the bottom surface of a sample to be tested is tightly attached to the plane of the adjusting block, preventing warping, and ensuring that a force application point is positioned on the central axis of the sample to be tested, so that the shearing force can greatly influence the test result due to the force application;
step (2), after a sample to be measured is firmly clamped in a clamping system, slightly lifting a pressing plate to enable the load of the sample to be measured to be zero, carrying out zero setting operation on a force sensor of a force measuring system, slightly and slowly placing the pressing plate on the sample to be measured, readjusting the position of the sample to be measured to ensure that the sample to be measured is free from warping and cannot be subjected to shearing force, slowly rotating a handle of the clamping system to enable force to be uniformly applied to the sample to be measured, observing a numerical value on a display of the force sensor, stopping applying the force when the numerical value reaches a target value, and locking the position;
step (3), adjusting the position of a laser displacement sensor of the displacement testing system, striking a laser spot at the protruding position of a platform of the clamping system, continuously adjusting the height of the laser displacement sensor to enable an indicator lamp of the laser displacement sensor to be a double-yellow lamp (or a correct measuring position), and performing zero setting operation on the displacement sensor;
and (4) connecting a double-end crocodile clamp led out by a power supply of a driving system with a positive electrode driving line and a negative electrode driving line of a sample to be tested, adjusting the voltage value of a direct current power supply to a target value, observing a displacement value displayed by software of the laser displacement sensor, returning the driving voltage to 0V if the displacement value is larger than zero, and continuously adjusting the pressure value until the displacement value is zero after full-voltage driving, wherein the force application value is the maximum output value of the sample to be tested.
Example 3
The embodiment provides a method for testing the output force of a piezoelectric actuator, which is based on the system of embodiment 1 and comprises the following specific steps:
step (1), selecting an adjusting block without a slot, loading the adjusting block on a platform of a clamping system, fastening and connecting a base and a vibration isolation platform by using bolts, loading a piezoelectric driver to be tested in the clamping system, ensuring that the bottom surface of a sample to be tested is tightly attached to the plane of the adjusting block, preventing warping, ensuring that a force application point is positioned on the central axis of the sample to be tested, avoiding the shearing force generated by force application, greatly influencing the test result,
step (2), after the sample to be measured is firmly clamped in the clamping system, slightly lifting the pressing plate to enable the load of the sample to be measured to be zero, carrying out zero setting operation on the force sensor of the force measuring system, then lightly and slowly placing the pressing plate on the sample to be measured, readjusting the position of the sample to be measured to ensure that the sample to be measured is not warped and cannot be subjected to shearing force, slowly rotating the handle of the clamping system to enable force to be uniformly applied on the sample to be measured, observing the numerical value on the display of the force sensor, stopping applying the force when the numerical value reaches the target value, locking the position,
step (3), adjusting the position of a laser displacement sensor of the displacement testing system, striking a laser spot at the protruding position of a platform of the clamping system, continuously adjusting the height of the laser displacement sensor to ensure that an indicator lamp of the laser displacement sensor is a double yellow lamp (or a correct measuring position), performing zero setting operation on the displacement sensor,
and (4) connecting a double-end crocodile clamp led out by a power supply of a driving system with a positive electrode driving line and a negative electrode driving line of a sample to be tested, adjusting the voltage value of a direct current power supply to a target value, observing a displacement value displayed by software of the laser displacement sensor, returning the driving voltage to 0V if the displacement value is larger than zero, and continuously adjusting the pressure value until the displacement value is zero after full-voltage driving, wherein the force application value is the maximum output value of the sample to be tested.
Example 4
The embodiment provides a method for testing the output of a piezoelectric amplifying mechanism, which is based on the system of embodiment 1 and comprises the following specific steps:
step (1), selecting an adjusting block conforming to the section of the amplifying mechanism, loading the adjusting block onto a platform of a clamping system, fastening and connecting a base and a vibration isolation platform by using bolts, loading a piezoelectric driver to be tested into the clamping system, ensuring that the bottom surface of a sample to be tested is tightly attached to the plane of the adjusting block, preventing warping, ensuring that a force application point is positioned on the central axis of the sample to be tested, avoiding that the shearing force can have larger influence on the test result due to the shearing force generated by force application,
step (2), after the sample to be measured is firmly clamped in the clamping system, slightly lifting the pressing plate to enable the load of the sample to be measured to be zero, carrying out zero setting operation on the force sensor of the force measuring system, then lightly and slowly placing the pressing plate on the sample to be measured, readjusting the position of the sample to be measured to ensure that the sample to be measured is not warped and cannot be subjected to shearing force, slowly rotating the handle of the clamping system to enable force to be uniformly applied on the sample to be measured, observing the numerical value on the display of the force sensor, stopping applying the force when the numerical value reaches the target value, locking the position,
step (3), adjusting the position of a laser displacement sensor of the displacement testing system, striking a laser spot at the protruding position of a platform of the clamping system, continuously adjusting the height of the laser displacement sensor to ensure that an indicator lamp of the laser displacement sensor is a double yellow lamp (or a correct measuring position), performing zero setting operation on the displacement sensor,
and (4) connecting a double-end crocodile clamp led out by a power supply of a driving system with a positive electrode driving line and a negative electrode driving line of a sample to be tested, adjusting the voltage value of a direct current power supply to a target value, observing a displacement value displayed by software of the laser displacement sensor, returning the driving voltage to 0V if the displacement value is larger than zero, and continuously adjusting the pressure value until the displacement value is zero after full-voltage driving, wherein the force application value is the maximum output value of the sample to be tested.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.
Claims (9)
1. The method for testing the output of the piezoelectric driver is characterized by being performed by a piezoelectric driver-based output testing system, wherein the piezoelectric driver-based output testing system comprises the following components: the device comprises a clamping system (10), a force measuring system (20), a displacement acquisition system (30), a displacement reading system (40), a driving system (50) and a vibration isolation platform (60),
the clamping system (10) is used for clamping the piezoelectric driver (1) to be tested, different forces are applied to the piezoelectric driver (1) to be tested, and the clamping system (10) is positioned on the vibration isolation platform (60);
the force measuring system (20) is used for reading the clamping force applied by the clamping system (10) to the piezoelectric driver (1);
the driving system (50) is arranged outside the clamping system (10) and connected with the piezoelectric driver (1) to be tested, and is used for inputting forward direct-current voltage to the piezoelectric driver (1) to be tested, and the piezoelectric driver (1) to be tested moves after being subjected to different driving voltages of the driving system (50), so that a moving platform in the clamping system (10) is driven to move;
the displacement acquisition system (30) is positioned outside the clamping system (10) and is used for measuring linkage movement displacement of the motion platform in the clamping system (10) due to the piezoelectric driver (1) to be tested;
the displacement reading system (40) is connected with the displacement acquisition system (30) and is used for reading displacement data acquired by the displacement acquisition system (30);
the method for testing the output of the piezoelectric driver comprises the following steps:
firstly, selecting an adjusting block which accords with the section shape of a piezoelectric driver to be tested, loading the adjusting block onto a moving platform of a clamping system, fastening and connecting a base of the clamping system and a vibration isolation platform by bolts, loading the piezoelectric driver to be tested into the clamping system, and ensuring that the bottom surface of the piezoelectric driver to be tested is tightly attached to the plane of the adjusting block, wherein a force application point is required to be positioned on the central axis of the piezoelectric driver to be tested;
step two, after the piezoelectric driver to be measured is firmly clamped in the clamping system, lifting a pressing plate of the clamping system, after the load of the piezoelectric driver to be measured is zero, carrying out zero setting operation on a force sensor of the force measuring system, then placing the pressing plate on the piezoelectric driver to be measured, readjusting the position of the piezoelectric driver to be measured, ensuring that the piezoelectric driver to be measured does not warp, slowly rotating a handle of the clamping system, enabling force to be uniformly applied to the piezoelectric driver to be measured, observing a numerical value on a display connected with the force sensor, stopping force application after the numerical value reaches a target value, and locking the readjusted locking position;
step three, adjusting the position of a laser displacement sensor of a displacement testing system, striking a laser spot at the protruding position of a moving platform of a clamping system, continuously adjusting the height of the laser displacement sensor, enabling an indicator lamp of the laser displacement sensor to be a double-yellow lamp or a correct measuring position, and performing zero setting operation on the laser displacement sensor;
and fourthly, connecting a power supply of the driving system with a positive electrode driving line and a negative electrode driving line of the piezoelectric driver to be tested, adjusting the voltage value of the direct current power supply to a target value, observing the displacement value displayed by software of the laser displacement sensor, if the displacement value is larger than zero, returning the driving voltage to 0V, continuously adjusting the pressure value until the displacement value is zero after full-voltage driving, and obtaining the force application value at the moment as the maximum force output value of the piezoelectric driver to be tested.
2. The method for testing the output of the piezoelectric actuator according to claim 1, wherein the clamping system (10) comprises a base (101), a guide rod (102), a moving platform (103), a pressing plate (104), a top plate (105), a screw (106) and a handle (107),
guide arm (102) set up four, and the lower extreme is connected on base (101), and the upper end is connected on roof (105), motion platform (103) and clamp plate (104) are all overlapped and are established on guide arm (102), can follow guide arm (102) and reciprocate, motion platform (103) are used for placing piezoelectric drive (1) that awaits measuring, screw rod (106) pass from roof (105) for promote clamp plate (104) downwardly moving and treat piezoelectric drive (1) application of force, force measurement system (20) are located motion platform (103) below, handle (107) are connected on screw rod (106) for rotatory screw rod (106) realizes the downwardly moving of clamp plate (104).
3. The method for testing the output of the piezoelectric driver according to claim 2, wherein an adjusting block (108) is arranged on the motion platform (103), and the adjusting block (108) is used for placing the piezoelectric driver (1) to be tested.
4. The method for testing the output force of the piezoelectric driver according to claim 2, wherein the force measuring system (20) comprises a spring, a force sensor and a display, the spring is positioned at the lower part of the clamping system (10), the upper end of the spring is connected with a moving platform of the clamping system (10), the lower end of the spring is connected with the force sensor, the force sensor is led out of a signal wire and connected with the display, the spring deforms to generate pressure during the downward movement of the moving platform of the clamping system (10), and the display displays the magnitude of the applied force at the moment after the force sensor is stressed.
5. The method according to claim 2, wherein the displacement acquisition system (30) comprises a laser displacement sensor and a laser displacement sensor adjusting device, the laser displacement sensor adjusting device is used for adjusting the position of the laser displacement sensor, the laser displacement sensor is located above the platform movement of the clamping system (10), the laser displacement sensor is used for striking a laser spot on the moving platform in the clamping system (10), and the laser spot of the laser displacement sensor changes when the moving platform in the clamping system (10) moves, so that the laser displacement sensor can calculate the movement displacement of the laser spot.
6. The method of claim 5, wherein the laser displacement sensor is a triangular reflection sensor.
7. The method according to claim 5, wherein the displacement reading system (40) is a computer with built-in software matched with a laser displacement sensor, the displacement data detected by the laser displacement sensor is input into the software matched with the laser displacement sensor, and the displacement generated by the piezoelectric driver to be detected is read out by the computer software.
8. The method according to claim 1, wherein the driving system (50) comprises a dc driving power source and a connection wire, the positive and negative electrodes of the connection wire are connected to the positive and negative electrodes of the piezoelectric driver, and the displacement of the piezoelectric driver (1) under the voltage is obtained by adjusting different voltages to the dc driving power source.
9. The method according to claim 1, wherein in the fourth step, the range of the forward direct voltage is 0 to 150V, the variation increment of the forward direct voltage is arbitrary, the range of the applied force is 0 to 2000N, and the variation increment of the force value is arbitrary.
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