Automatic frequency measurement system for aero-engine blade

Abstract

The invention relates to the technical field of aero-engine blade frequency measurement, and particularly discloses an aero-engine blade automatic frequency measurement system, which comprises a first excitation table, a second excitation table, a detection manipulator, a feeding manipulator, an inverted visual frame, a blade material frame and an automatic tightening device, the detection manipulator is arranged on one side of the first vibration excitation table or the second vibration excitation table, and a frequency measurement instrument is arranged on the detection manipulator; the feeding manipulator is arranged on one side of the blade rack, and a blade clamping jaw and a two-dimensional visual camera are arranged on the feeding manipulator; the two sets of automatic tightening devices are arranged on one side of the first shock excitation table and one side of the second shock excitation table respectively. The inverted visual frame is arranged on one side of the blade material frame, and a three-dimensional visual camera is arranged on the inverted visual frame.

Description

Technical Field

[0001] This application relates to the technical field of aero-engine blade frequency measurement, and particularly to an automatic aero-engine blade frequency measurement system. Background Art

[0002] The frequency measurement of aero-engine blades is one of the most important links in the repair and manufacturing processes of engine blades. Its inherent frequency distribution characteristics and quality directly affect the reliability of blade operation and the stable operation margin of the engine. However, for many years, blade frequency measurement has still relied on traditional manual operations, which have significant drawbacks. First, the entire measurement process is manual, resulting in high labor intensity and low work efficiency. Second, there are many human interference factors in the measurement process, including the clamping, loading, unloading of blades, manually operating the industrial control machine for frequency scanning and data recording, leading to poor process quality consistency. Third, the noise control effect during the measurement process is not good, and the risk of occupational diseases is high. Summary of the Invention

[0003] The purpose of this application is to provide an automatic aero-engine blade frequency measurement system to solve the problems in the prior art that blade frequency measurement relies on traditional manual operations, with high labor intensity and low work efficiency, many human interference factors in the measurement process, resulting in poor process quality consistency, poor noise control effect during the measurement process, and high risk of occupational diseases.

[0004] To achieve the above purpose, an embodiment of this application provides an automatic aero-engine blade frequency measurement system, including: a first excitation table, a second excitation table, a detection manipulator, a loading manipulator, a reverse mounting vision frame, a blade rack, and an automatic tightening device. Among them,

[0005] The detection manipulator is arranged on one side of the first excitation table or the second excitation table, and a frequency meter is provided on the detection manipulator;

[0006] The loading manipulator is arranged on one side of the blade rack, and a blade gripper and a two-dimensional vision camera are provided on the loading manipulator;

[0007] There are two sets of automatic tightening devices, which are respectively arranged on one side of the first excitation table and the second excitation table;

[0008] The reverse mounting vision frame is arranged on one side of the blade rack, and a three-dimensional vision camera is provided on the reverse mounting vision frame.

[0009] Optionally, the automatic tightening device includes a tightening shaft, a first linear guide rail, a second linear guide rail, a first air cylinder, and a second air cylinder. A first sliding table is slidably connected to the first linear guide rail. The tightening shaft is disposed on the first sliding table, and the end of the tightening shaft faces the first vibration exciter or the second vibration exciter. A second sliding table is provided on the second linear guide rail. The first air cylinder and the first linear guide rail are both disposed on the second sliding table. The output shaft of the first air cylinder is parallel to the first linear guide rail and connected to the first sliding table. The second air cylinder and the second linear guide rail are disposed on the support platform. The output shaft of the second air cylinder is parallel to the second linear guide rail and connected to the second sliding table.

[0010] Optionally, it further includes:

[0011] A sound insulation device, which is annular and surrounds the automatic tightening device, the first vibration exciter, the second vibration exciter, the detection manipulator, the loading and unloading manipulator, and the cooling fan.

[0012] Optionally, it further includes:

[0013] An air conditioner, which is disposed inside the sound insulation device.

[0014] Optionally, it further includes:

[0015] A cooling fan, which is connected to the first vibration exciter or the second vibration exciter.

[0016] Optionally, it further includes:

[0017] A control system, which includes a main controller PLC. The main controller PLC is used for the logic control of the entire system, and realizes the on-line display of the detection status of the part detection sensor, the status of the fixture, the alarm information, the production product model, the production shift, and the production output information during the measurement process.

[0018] Optionally, the main controller PLC adopts a Siemens S7-200 SMART series PLC.

[0019] Optionally, it further includes:

[0020] A software system, and the control interface of the software system includes a principle display section, a control section, a data display section, and a channel calibration section.

[0021] Optionally, the detection manipulator adopts an ABB IRB1200 type robot, which is used to complete the blade frequency measurement work;

[0022] The loading and unloading manipulator selects an ABB IRB2400 type industrial robot, which is used for the loading and unloading of blades.

[0023] Optionally, the first excitation table is controlled by a first excitation controller, and the second excitation table is controlled by a second excitation controller.

[0024] The embodiments of the present application have the following advantages:

[0025] Compared with the prior art, the automatic blade frequency measurement system for aero-engines provided by the above technical solution integrates the traditional blade frequency measurement process through mechanization, automation, and informatization means, and designs the cooperation mode of a vibration system, a vision detection system, a mechanical motion structure, a sound insulation device, a control system, an automatic tightening device, and a data acquisition system, realizing high-quality and high-efficiency automatic measurement of blade frequency. This method is mainly used for measuring the natural frequency of aero-engine blades. Thus, it solves the problems in the prior art that the blade frequency measurement relies on traditional manual work, resulting in high labor intensity, low work efficiency, large human interference factors in the measurement process, poor process quality consistency, poor noise control effect during the measurement process, and high occupational disease risk.

[0026] In addition, the automatic tightening device is mainly used to tighten the bolts for locking the blades on the test fixture with a constant torque. The relative positions of the two tightening bolts of the three test fixtures are designed to be the same, and a tightening shaft is installed on two linear guides to achieve movement along the connection line of the two tightening bolts and the direction perpendicular to the connection line. The power for movement is provided by a cylinder, and the position is guaranteed by mechanical limits. Description of the Drawings

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained based on the provided drawings.

[0028] Figure 1 It is a top view of the overall structure of an automatic blade frequency measurement system for aero-engines provided by at least one embodiment of the present application;

[0029] Figure 2 It is a three-dimensional schematic diagram of the overall structure of an automatic blade frequency measurement system for aero-engines provided by at least one embodiment of the present application;

[0030] Figure 3 It is a partial three-dimensional schematic diagram of the internal structure of the sound insulation device of an automatic blade frequency measurement system for aero-engines provided by at least one embodiment of the present application;

[0031] Figure 4 It is a three-dimensional schematic diagram of the loading manipulator of an automatic blade frequency measurement system for aero-engines provided by at least one embodiment of the present application;

[0032] Figure 5 Schematic three-dimensional view of the detection manipulator of an automatic blade frequency measurement system provided for at least one embodiment of the present application;

[0033] Figure 6 Schematic three-dimensional view of the automatic tightening device of an automatic blade frequency measurement system provided for at least one embodiment of the present application.

[0034] Explanation of reference numerals:

[0035] 1. First excitation table, 2. Second excitation table, 3. First excitation controller, 4. Second excitation controller, 5. Detection manipulator, 6. Loading manipulator, 7. Blade rack, 8. Two-dimensional vision camera, 9. Inverted vision frame, 10. Cooling fan, 11. Automatic tightening device, 12. Tightening shaft, 13. First linear guide rail, 14. Second linear guide rail, 15. First cylinder, 16. Second cylinder, 17. First sliding table, 18. Second sliding table, 19. Sound insulation device, 20. Air conditioner, 21. Support platform, 22. Frequency meter, 23. Blade gripper. Detailed implementation manners

[0036] The following specific embodiments illustrate the implementation manners of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of them. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0037] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Unless otherwise clearly defined and limited, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0038] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0039] An embodiment of the present application provides an automatic frequency measurement system for aeroengine blades. Referring to Figures 1 to 6 , it includes:

[0040] A first excitation table 1, a second excitation table 2, a detection manipulator 5, a loading manipulator 6, an upside-down vision frame 9, a blade rack 7, and an automatic tightening device 11. Among them,

[0041] The detection manipulator 5 is arranged on one side of the first excitation table 1 or the second excitation table 2, and a frequency meter 22 is provided on the detection manipulator 5;

[0042] The loading manipulator 6 is arranged on one side of the blade rack 7, and a blade gripper 23 and a two-dimensional vision camera 8 are provided on the loading manipulator 6;

[0043] There are two sets of the automatic tightening devices 11, which are respectively arranged on one side of the first excitation table 1 and the second excitation table 2;

[0044] The upside-down vision frame 9 is arranged on one side of the blade rack 7, and a three-dimensional vision camera is provided on the upside-down vision frame 9.

[0045] Specifically, the loading manipulator 6 uses the blade gripper 23 to pick up the blade from the blade rack 7. After the blade is loaded, the blade is placed on the first excitation table 1 or the second excitation table 2, and the frequency meter 22 needs to detect the blade. The detection manipulator 5 cooperates with the vibration device, uses the frequency meter 22 to detect the vibration frequency of the blade, and generates a data graph, which is uploaded to the computer system. The detection manipulator 5 needs to take into account both excitation tables at the same time. While the loading manipulator 6 is loading one excitation table, it detects the blade on the other excitation table, forming an alternating mode of one for loading and unloading and the other for frequency measurement detection.

[0046] Specifically, the operator places the small trailer with the blades on the designated material taking position for loading. The loading manipulator 6 moves above the blade rack 7. First, it uses the two-dimensional vision camera 8 provided on the loading manipulator 6 to scan and locate the position of the blade, and corrects the position of the blade. Then the loading manipulator 6 grabs the blade. Clamp the blade above the upside-down vision frame 9, use 3D vision to scan and image the tail of the blade, and the robot automatically corrects the posture according to the scanning result, and finally places it on the first excitation table 1 or the second excitation table 2, waiting for measurement.

[0047] In some embodiments, the detection manipulator 5 uses an ABB IRB1200 type robot to complete the blade frequency measurement work; in some embodiments, the loading and unloading manipulator selects an ABB IRB2400 type industrial robot for the loading and unloading work of the blades.

[0048] In some embodiments, the first excitation table 1 is controlled by the first excitation controller 3, and the second excitation table 2 is controlled by the second excitation controller 4.

[0049] Specifically, two sets of vibration devices are provided. Each set of vibration devices includes an excitation table and an excitation controller respectively, forming a double excitation system. The double excitation system can start detecting the vibration frequency of the blade with the frequency measuring instrument 22 while the loading manipulator 6 is loading the blade, improving the detection efficiency. A device for tightening the blade after clamping is designed to replace the traditional manual tightening method and realize the automatic tightening function.

[0050] In some embodiments, referring to Figure 6 , the automatic tightening device 11 includes a tightening shaft 12, a first linear guide rail 13, a second linear guide rail 14, a first cylinder 15, and a second cylinder 16. A first slide table 17 is slidably connected to the first linear guide rail 13. The tightening shaft 12 is arranged on the first slide table 17, and the end of the tightening shaft 12 faces the first excitation table 1 or the second excitation table 2. A second slide table 18 is provided on the second linear guide rail 14. The first cylinder 15 and the first linear guide rail 13 are both arranged on the second slide table 18. The output shaft of the first cylinder 15 is parallel to the first linear guide rail 13 and is connected to the first slide table 17. The second cylinder 16 and the second linear guide rail 14 are arranged on the support platform 21. The output shaft of the second cylinder 16 is parallel to the second linear guide rail 14 and is connected to the second slide table 18.

[0051] Specifically, the automatic tightening device 11 is mainly used to tighten the bolts for locking the blade on the test fixture with a constant torque. The relative positions of the two tightening bolts of the three test fixtures are designed to be the same. One tightening shaft 12 is installed on two linear guide rails to realize the movement along the connection line of the two tightening bolts and the direction perpendicular to the connection line. The power for the movement is provided by the cylinder, and the position is guaranteed by mechanical limit.

[0052] In some embodiments, referring to Figure 2 , it further includes: a sound insulation device 19. The sound insulation device 19 is annular and surrounds the automatic tightening device 11, the first excitation table 1, the second excitation table 2, the detection manipulator 5, the loading manipulator 6, and the cooling fan 10.

[0053] Specifically, during the measurement process, the peak frequency can reach 5000Hz, and the persistent high-frequency noise causes great harm to the health of personnel. In order to suppress the high-frequency noise generated during the blade frequency measurement process, a sound insulation device 19 is designed according to the structural characteristics and physical dimensions of the entire frequency measurement system. The measurement process is enclosed in the sound insulation device 19, and the sound insulation size is about (6000×4500×3500) mm, which can effectively control the noise within 75dB.

[0054] In some embodiments, it also includes: an air conditioner 20, and the air conditioner 20 is arranged in the sound insulation device 19.

[0055] In some embodiments, the system further includes: a cooling fan 10 , which is connected to the first vibration table 1 or the second vibration table 2 and is used to cool the first vibration table 1 or the second vibration table 2 .

[0056] In some embodiments, it also includes: a control system, the control system includes a main controller PLC, the main controller PLC is used for the logic control of the entire system, and the detection status of the part detection sensor, the status of the fixture, the alarm information, the production product model, the production shift and the output during the measurement process can all be displayed online. At the same time, when the device controlled by the control system fails, it can automatically diagnose and generate corresponding sound and light alarm signals, and display the fault information on the on-site distribution background system. After the fault is eliminated and confirmed, the online task can continue to be completed automatically.

[0057] In some embodiments, the main controller PLC adopts Siemens S7-200SMART series PLC.

[0058] The main functions of the control system are implemented as follows:

[0059] 1. Use industrial computers to display the detection status of part detection sensors, fixture status, alarm information, production product models, production shifts and output.

[0060] 2. The control mode is switched through the control button. The main control modes are manual, automatic and emergency stop. Manual control mode: In the manual operation mode, the electrical control system manually starts / stops each motor in forward and reverse directions. Online control mode: In the online control mode, the device receives instructions from the host computer to achieve automatic control of the device.

[0061] 3. Emergency Stop and Fault Alarm: The electric control cabinet and the touch screen have an emergency stop operation function. When the emergency stop button is pressed, all the devices controlled in this area will stop running. When a fault occurs in the devices controlled by the system, it can automatically diagnose and generate corresponding audible and visual alarm signals, and display the fault information on the on-site distributed background system. After the fault is eliminated and confirmed, the online tasks can continue to be automatically completed.

[0062] In some embodiments, it further includes: a software system, which is written using NI LabVIEW software. Its control interface includes a principle display section, a control section, a data display section, and a channel calibration section. The principle display section can not only clearly show the working principle of the entire system, but also observe the operating status of the components, facilitating the identification of control errors. The control section mainly includes control buttons for components such as motors and solenoid valves, and the operator can control the actions of the corresponding components by simply using the mouse. The data display section mainly displays data such as the shaft position in the system in a form combining graphics and numbers. The functions of the software system include:

[0063] (1) Permission management function

[0064] The login interface sets the permission management function (divided into administrator, technician, and operator), which can create, save, and modify user information, identify different user permissions, and the software functions are opened according to the permissions.

[0065] (2) Machine hour recording function

[0066] The machine hour recording function is set to record the usage and maintenance of the equipment.

[0067] (3) Identification function

[0068] It can automatically identify the characters on the blade and locally save the identified data.

[0069] (4) Report generation function

[0070] It can print and output the work card in accordance with the established work card format for the measured data.

[0071] (5) Data management

[0072] It can query historical data by machine number or order number, and upload or print historical data.

[0073] (6) Obtain dispatching information by swiping the card

[0074] When in use, log in by swiping the work card, obtain the dispatching information from the server through the employee ID number registered in the background, and it will be automatically displayed on the interface. The operator selects the order number to perform the corresponding test.

[0075] (7) Data upload function

[0076] After centrally processing the device experiment data and device status data, upload them to the factory server. Users can query such information through a specified website on the factory intranet. After processing such data through the information center, the function of remote printing of electronic work cards can be realized.

[0077] The implementation solution for data upload is as follows:

[0078] Device designers first log in to the factory server website to register the device, fill in the network database according to the requirements of device test data, and generate a data interaction interface file (registration parameters include device number, test product information, collected digital quantity information, collected analog quantity information, user login information, device status, etc.). Then the local online measurement software generates a network interaction file in.xml format according to the registration parameters and in accordance with the established interface file format, and uploads it to the factory server.

[0079] The network server unpacks and processes the uploaded data, and judges whether the format meets the requirements. If it meets the requirements, it is permanently saved; otherwise, it is returned and a "upload failed" prompt message is displayed on the registration interface.

[0080] (8) Network report function

[0081] After completing the data upload, users can log in to the specified network interface to view the relevant test data. The user work card manager needs to upload and improve the network work card template and issue the.xml file at the same time. Then the device uploads data according to the issued.xml file. After successful upload, a network work card can be generated on the network.

[0082] The complete measurement process of using the aeroengine blade automatic frequency measurement system provided by this application is realized by the following steps:

[0083] (I) Power on

[0084] Push the circuit breaker switch in the device power supply box upward to connect the power supply, and then press the green lighted "Power On" button on the operation panel. After the device is powered on, the white "Incoming Power" indicator light is lit.

[0085] (II) Turn on the vibration exciter and the robot

[0086] Rotate the key switch on the vibration control cabinet to the "On" position. The vibration control cabinet automatically powers on and boots up, and the touch screen lights up and a screen is displayed. After power on, the manipulator automatically boots up. Check whether the "Mode" switch on the manipulator control cabinet is rotated to the automatic operation mode.

[0087] (III) Turn on the air conditioner 20

[0088] Press the power on / off key of the air conditioner 20 to turn on the air conditioner 20. Set the working mode of the air conditioner 20 to the cooling mode and adjust the set temperature to 22°C. Empty the condensate water bucket of the air conditioner 20. The air conditioner 20 should be turned on before starting the vibration table.

[0089] (4) Select the tooling

[0090] Install the tooling corresponding to the blade on the vibration exciter. There is a pin positioning device on the tooling installation surface, and the tooling should be installed in place.

[0091] (5) Place the blades

[0092] Place the blades to be tested on the blade rack 7 in sequence. Each type of blade corresponds to a specific blade rack 7, and they cannot be mixed. And only one type of blade can be placed for testing at a time. When placing the blades, the blade numbers should be arranged in sequence according to the numbers marked on the blade rack 7. Blades that do not need to be tested can be left empty. Pay attention to inserting the blades in place when placing them.

[0093] (6) Lock the blade rack

[0094] After pushing the blade rack 7 with the blades placed on it into the loading position using a trolley, press the two locking buttons. The locking cylinder will fix the blade rack 7 in the loading position and it will not move. If the locking is abnormal, the device cannot be started.

[0095] (7) Turn on the vision system

[0096] Click on the vision software icon on the desktop of the industrial control computer to run the vision software.

[0097] (8) Turn on the measurement system

[0098] On the touch screen of the vibration exciter, click the "Power Amplifier Control" icon to enter the power amplifier control interface. Click the "Power On" button to start the power supply. After a delay of about 3s, click the "Start" button to turn on the power amplifier and adjust the gain to the corresponding ratio. The main interface is mainly divided into several areas such as the main menu, waveform display, result data display, product measurement parameters, alarm display, operation buttons, and status display.

[0099] (9) Start the test

[0100] Before starting the test, please confirm again the blade model, tooling model, blade placement position, blade box placement position, the position and sequence of the jaws on the jaw holder, the height of the vibration exciter, whether the key switch on the manipulator control cabinet is turned to the automatic operation mode position, the key switch on the operation panel is turned to the "Automatic" position, and whether the air conditioner 20 is turned on, etc. Click the "Start" button, and the device will gradually start. After the start is completed, the "Operating Status" indicator light will turn green and flash.

[0101] (10) Test completed

[0102] After the feeding manipulator 6 and the inspection manipulator 5 have taken all the blades on the blade rack 7 or tested the set number of blades, the system will stop running, and the feeding manipulator 6 will put the gripper back on the gripper rack and return to its original position. The measurement data results will be automatically recorded and transmitted to the corresponding website for record-keeping purposes.

[0103] (XI) Shutting Down

[0104] Before shutting down the system, it is necessary to confirm that the manipulator has returned to its original position and the tightening shaft 12 is not in the tightened position. Before closing the test software, first click the "Lower" button on the touch screen to modulate the gain of the shaker table to the 0% position, then click the "Reset" button on the touch screen of the shaker table control cabinet, and click "Shut Down" to stop the shaker table (the fan will continue to run for about 10 minutes after the vibration table is turned off to ensure coil cooling).

[0105] In summary, compared with the prior art, the system provided in this application integrates the traditional blade frequency measurement process through mechanization, automation, and informatization means, designs the cooperation mode of the vibration system, vision detection system, mechanical motion structure, sound insulation device, control system, automatic tightening device, and data acquisition system, and realizes the high-quality and high-efficiency automatic measurement of blade frequency. This method is mainly used for measuring the natural frequency of aeroengine blades. The beneficial effects include: the production efficiency of the automatic measurement method is twice that of the traditional manual operation, effectively reducing the production cycle and labor intensity; the automatic measurement method realizes unmanned operation, fully eliminates human interference factors, ensures the stability of process quality, and saves labor costs; the automatic measurement method can effectively control the noise pollution in the production process and eliminate the risk of occupational diseases.

[0106] Note that unless otherwise directly stated, all features disclosed in this specification (including any appended claims, abstract, and drawings) can be replaced by alternative features that serve the same, equivalent, or similar purpose. Therefore, unless otherwise clearly stated, each disclosed feature is only an example of a group of equivalent or similar features. In the case of use, further, preferably, furthermore, and more preferably are simply the starting points for elaborating another embodiment based on the foregoing embodiment. The content following the further, preferably, furthermore, or more preferably in combination with the foregoing embodiment constitutes the complete composition of another embodiment. The components formed by arbitrarily combining several further, preferably, furthermore, or more preferably settings following the same embodiment can form another embodiment.

[0107] In the implementation of functions and steps, the corresponding functions and steps in each embodiment can also occur in an order different from that shown. For example, two consecutive functions and steps can actually be executed or implemented substantially in parallel, and sometimes they can also be executed or implemented in the reverse order, depending on the functions involved.

[0108] Although the present application has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made thereto on the basis of the present application, which will be obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present application all fall within the scope of protection required by the present application.

Claims

1. An automatic frequency measurement system for aircraft engine blades, characterized in that: include: The first vibration table, the second vibration table, the detection robot, the loading robot, the inverted visual rack, the blade rack, and the automatic tightening device, among which, The detection manipulator is arranged on one side of the first excitation platform or the second excitation platform, and a frequency measuring instrument is arranged on the detection manipulator; The feeding manipulator is arranged on one side of the blade material rack, and is provided with a blade gripper and a two-dimensional visual camera; There are two sets of automatic tightening devices, which are respectively arranged on one side of the first excitation platform and the second excitation platform; The inverted vision frame is arranged at one side of the blade material rack, and a three-dimensional vision camera is arranged on the inverted vision frame.

2. The aircraft engine blade automatic frequency measurement system according to claim 1, characterized in that: The automatic tightening device includes a tightening shaft, a first linear guide, a second linear guide, a first cylinder, and a second cylinder. The first linear guide is slidably connected to a first slide. The tightening shaft is arranged on the first slide, and the end of the tightening shaft faces the first excitation table or the second excitation table. The second linear guide is provided with a second slide. The first cylinder and the first linear guide are both arranged on the second slide. The output shaft of the first cylinder is parallel to the first linear guide and connected to the first slide. The second cylinder and the second linear guide are arranged on a supporting platform, and the output shaft of the second cylinder is parallel to the second linear guide and connected to the second slide.

3. The aircraft engine blade automatic frequency measurement system according to claim 1, characterized in that: Also includes: The sound insulation device is annular and surrounds the automatic tightening device, the first vibration table, the second vibration table, the detection robot, the loading robot and the cooling fan.

4. The aircraft engine blade automatic frequency measurement system according to claim 3, characterized in that: Also includes: An air conditioner is arranged in the sound insulation device.

5. The aircraft engine blade automatic frequency measurement system according to claim 1, characterized in that: Also includes: A cooling fan is connected to the first vibration table or the second vibration table.

6. The aircraft engine blade automatic frequency measurement system according to claim 1, characterized in that: Also includes: The control system includes a main controller PLC, which is used for the logic control of the entire system. The measurement process realizes online display of the detection status of the part detection sensor, the status of the fixture, the alarm information, the production product model, the production shift and the output information.

7. The aircraft engine blade automatic frequency measurement system according to claim 6, characterized in that: The main controller PLC adopts Siemens S7-200SMART series PLC.

8. The aircraft engine blade automatic frequency measurement system according to claim 1, characterized in that: Also includes: The software system control interface includes a principle display panel, a control panel, a data display panel and a channel verification panel.

9. The aircraft engine blade automatic frequency measurement system according to claim 1, characterized in that: The detection manipulator adopts an ABB IRB1200 robot, which is used to complete the blade frequency measurement work; The loading and unloading manipulator is an ABB IRB2400 industrial robot, which is used for loading and unloading of blades.

10. The aircraft engine blade automatic frequency measurement system according to claim 1, characterized in that: The first excitation platform is controlled by a first excitation controller, and the second excitation platform is controlled by a second excitation controller.

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