Aerial turbojet engine main shaft measuring device and method

Abstract

The invention belongs to the technical field of main shaft measurement, and discloses an aviation turbojet engine main shaft measuring device and method.The measuring device comprises an outer profile frame, an upper lifting frame is fixedly installed at the top end of the outer profile frame, and a double-roller synchronous rolling structure used for supporting a main shaft and enabling the main shaft to rotate around the axis is installed in the upper lifting frame; an inner profile conveying frame is installed in the outer profile frame, a radial double-roller anti-jumping mechanism used for limiting the main shaft is arranged above the double-roller synchronous rolling structure, a pneumatic lifter is installed in the inner profile conveying frame in a sliding mode, and an ultrasonic thickness measuring probe is installed at the driving end of the pneumatic lifter. A double-belt linear traction structure used for driving the pneumatic lifter and the ultrasonic thickness measuring probe to move in the axis direction of the main shaft is installed in the inner profile conveying frame, and a rotating driver used for outputting rotating power to the double-roller synchronous rolling structure and the double-belt linear traction structure is arranged on the outer wall of one side of the lifting frame. According to the invention, the main shaft can be measured.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of measuring the main shaft of an aero turbojet engine, in particular, relates to a kind of aero turbojet engine main shaft measuring equipment and method. BACKGROUND

[0002] The main shaft of an aero turbojet engine is a key mechanical component inside the engine, mainly responsible for connecting and supporting various rotating components, while transmitting torque and bearing axial force; The design requirements of the main shaft are extremely high, which needs to ensure the stability and safety at high speed rotation; Its outer surface is usually provided with keyways, which are used to realize the mechanical connection between the main shaft and the impeller or other transmission components, prevent relative sliding and ensure the reliability of power transmission.

[0003] In the quality control process of the main shaft, the circular runout and thickness detection are two important detection contents; The circular runout detection is used to measure the radial deviation of the outer surface of the main shaft during rotation, which can reflect whether the main shaft has deformation such as bending or ovality, to ensure the stability of rotation; The detection is usually completed by high-precision measuring equipment, the main shaft is fixed on the clamp and slowly rotates, and the measuring probe records the radial change of the surface in real time; The thickness detection measures the radial dimension of the key parts of the main shaft, especially the width and depth of the keyway, to ensure the fitting accuracy of the key and the groove and the firmness of the connection; The thickness measurement can use contact tools such as micrometer, or use advanced technologies such as non-contact laser scanning to obtain detailed three-dimensional profile information.

[0004] The Chinese invention patent with patent application number CN202510819648.X discloses an aero turbojet engine main shaft measuring device and its using method, which comprises a mounting frame, two annular plates are symmetrically fixedly connected on the mounting frame, a circular plate is movably connected between the two annular plates, a plurality of measuring assemblies are uniformly distributed on the circular plate, a detection rotating assembly is arranged on the mounting frame, the power output end of the detection rotating assembly is in transmission connection with the circular plate for driving the circular plate to rotate, an activity plate is movably connected on the inner bottom surface of the mounting frame, two main shaft locking assemblies are movably arranged on the top surface of the activity plate, which can ensure that the spherical ball realizes real-time contact with the outer wall of the main shaft under the action of the spring, and the circular plate is driven to rotate by the first motor, the measuring assemblies are moved in a ring shape by the circular plate, at this time, the spherical ball moving on the outer wall of the main shaft can drive the activity rod to move, the activity rod drives the flat plate to move, and the moving distance of the flat plate is detected in real time by the distance sensor, thereby realizing the measurement operation of the main shaft.

[0005] However, this kind of measurement method will be affected by the keyway on the outer surface of the engine main shaft, that is, the keyway as a structure recessed on the outer surface of the main shaft causes the measuring probe to encounter a sudden change in surface height when rotating around the main shaft, and the keyway makes the probe appear a short "jumping" or "disengaging" phenomenon when passing through the keyway, resulting in a sharp peak or abnormal fluctuation in the measurement signal, which is not caused by the true geometric error of the main shaft, but by the interference of the keyway structure, so that the measurement data cannot accurately reflect the true circumferential runout of the main shaft, and the thickness measurement of the main shaft in the axial direction is also not continuous and stable, affecting the accuracy of the main shaft measurement. SUMMARY

[0006] The purpose of the present application is to provide an aviation turbojet engine main shaft measurement device and method, the aviation turbojet engine main shaft to be measured for thickness is placed on a double-roller synchronous rolling structure, and a radial double-roller anti-jumping mechanism is adjusted according to the specifications of the main shaft, then the ultrasonic thickness measuring probe is driven upward by the pneumatic lifter, so that the ultrasonic thickness measuring probe contacts the outer wall of the main shaft, after the adjustment of each part is completed, the rotary driver outputs rotary power to the double-roller synchronous rolling structure and the double-belt linear traction structure to make them work, the double-roller synchronous rolling structure and the radial double-roller anti-jumping mechanism drive the engine main shaft to rotate stably, and the double-belt linear traction structure drives the pneumatic lifter and the ultrasonic thickness measuring probe to move along the axis of the main shaft, until the thickness measurement of the whole main shaft is completed, thereby solving the problems raised in the background art.

[0007] To solve the above technical problems, the present application provides the following technical scheme: An aviation turbojet engine main shaft measurement device, comprising an outer profile frame, a lifting frame is fixedly installed at the top end of the outer profile frame, a double-roller synchronous rolling structure for supporting the main shaft and making it rotate around the axis is installed inside the lifting frame, an inner profile conveying frame is installed inside the outer profile frame, a radial double-roller anti-jumping mechanism for limiting the main shaft is arranged above the double-roller synchronous rolling structure, a pneumatic lifter is slidingly installed inside the inner profile conveying frame, an ultrasonic thickness measuring probe is installed on the driving end of the pneumatic lifter, a double-belt linear traction structure for driving the pneumatic lifter and the ultrasonic thickness measuring probe to move along the axis of the main shaft is installed inside the inner profile conveying frame, a rotary driver for outputting rotary power to the double-roller synchronous rolling structure and the double-belt linear traction structure is arranged on the outer wall of one side of the lifting frame, a control panel is installed on the outer profile frame, and the output end of the control panel is electrically connected with the input ends of the radial double-roller anti-jumping mechanism, the rotary driver and the pneumatic lifter.

[0008] The following is a further optimization of the technical scheme of the present application: The double-roller synchronous rolling structure comprises two lower supporting shaft rollers rotatably installed at the front and rear positions inside the upper lifting frame, a gap part is arranged between the two lower supporting shaft rollers, and the end portions of the two lower supporting shaft rollers are drivingly connected through a chain wheel transmission structure one.

[0009] Further optimization: the radial double-roller anti-jumping mechanism comprises square columns fixedly installed at the corner positions inside the outer profile frame and extending upward, two double-sleeve shaft frames are slidingly installed on the square columns on the same side in the vertical direction, two upper pressing rollers are rotatably installed between the opposite side walls of the two double-sleeve shaft frames and located above the lower supporting shaft rollers, a first air cylinder is installed on one side wall of one of the square columns, and the bottom end of the piston rod of the first air cylinder is fixedly connected with the top end of the corresponding double-sleeve shaft frame.

[0010] Further optimization: a vertical-direction-extending dovetail guide rail is fixedly installed on one side wall of the square column, a sliding block is installed on the double-sleeve shaft frame, and the double-sleeve shaft frame is slidingly installed on the square column through the cooperation of the sliding block and the dovetail guide rail.

[0011] Further optimization: a straight slot is arranged on one side wall of the upper lifting frame, a U-shaped block is slidingly installed inside the straight slot, a locking handle is arranged on one side wall of the U-shaped block and used for locking the U-shaped block in the straight slot of the upper lifting frame, and a blocking rod is fixedly arranged on the other side wall of the U-shaped block and used for blocking one end portion of the main shaft.

[0012] Further optimization: the rotary driver comprises a worm and gear reducer installed on one side wall of the upper lifting frame, a stepping motor is drivingly connected to the power input end of the back surface of the worm and gear reducer, the worm and gear reducer has two power output ends, one of the power output ends is drivingly connected with the corresponding lower supporting shaft roller, and the other power output end is drivingly connected with a chain wheel transmission structure two.

[0013] Further optimization: the double-belt linear traction structure comprises a front shaft and a rear shaft rotatably installed at the left and right positions inside the inner profile conveying frame, two belt linear modules are installed between the front shaft and the rear shaft, and the front shaft is drivingly connected with the other end of the chain wheel transmission structure two.

[0014] Further optimization: the pneumatic lifter comprises a sliding carriage slidingly installed on the top of the inner profile conveying frame, a second air cylinder is installed inside the sliding carriage, a supporting plate is fixedly installed at the top end of the piston rod of the second air cylinder, right-angle arms are fixedly installed at the corner positions at the top end of the sliding carriage, the other side wall of the right-angle arm is fixedly connected with the belt in the belt linear module, and an ultrasonic thickness measuring probe is installed at the top end of the supporting plate.

[0015] Further optimization: the chain wheel transmission structure two includes a main chain wheel installed on the power output end of the worm gear reducer, a secondary chain wheel fixedly installed on the outer surface of the front shaft, and a transmission chain installed between the main chain wheel and the secondary chain wheel.

[0016] The application also provides a measurement method of the main shaft of the aviation turbojet engine, based on the measurement device of the main shaft of the aviation turbojet engine. S101: The staff adjusts the position of the radial double-roller anti-bounce mechanism by inputting parameters through the control panel according to the model and specifications of the main shaft, the radial double-roller anti-bounce mechanism applies appropriate pressure from the upper two sides of the main shaft, and the radial double-roller anti-bounce mechanism and the lower double-roller synchronous rolling structure jointly constitute a stable constraint platform, and the ultrasonic thickness gauge probe is slowly lifted by the pneumatic lifter until the probe is in contact with the lower surface of the outer wall of the main shaft. S102: The staff sends a working instruction to the rotary driver through the control panel, the rotary driver drives the double-roller synchronous rolling structure to work, the main shaft starts to rotate at a constant speed and stably around its own axis, and the double-belt linear traction structure drives the entire pneumatic lifter and the ultrasonic thickness gauge probe to move slowly and continuously in a straight line along a direction parallel to the axis of the main shaft, so that the movement track of the ultrasonic thickness gauge probe relative to the surface of the main shaft becomes a regular spiral line. S103: During the scanning process, the ultrasonic thickness gauge probe continuously emits ultrasonic pulses and receives echoes, and the instrument connected with the ultrasonic thickness gauge probe internally calculates and records the thickness data of each measurement point in real time, the data is one-to-one corresponding to the axial position and circumferential angle coordinates of the probe, and is synchronously stored into the computer system. S104: When the ultrasonic thickness gauge probe completes the length scanning of the entire main shaft, the staff can adjust the initial contact position of the main shaft and the ultrasonic thickness gauge probe, and then performs a measurement operation again, or stops the equipment, resets each part, and then uses the hoisting equipment to lift the measured main shaft away from the working position.

[0017] The application has at least the following beneficial effects by adopting the above technical scheme: 1: The double-roller synchronous rolling structure and the double-belt linear traction structure in the application are matched with each other to construct a stable and repeatable scanning movement platform, the main shaft is stably constrained by the radial double-roller anti-bounce mechanism, the consistency of the rotation center is ensured, the radial bounce and vibration in the measurement process are reduced, the ultrasonic thickness gauge probe is driven by the double-belt linear traction structure to move at a constant speed and in a straight line along the axis, the combination of the uniform rotation and the uniform linear motion makes the movement track of the probe relative to the surface of the main shaft a regular spiral line, and the measurement breakpoint caused by the key groove on the surface of the main shaft is avoided, so that the surface of the main shaft is continuously scanned, the detection blind area caused by the sparse point position and the inaccurate positioning in the manual measurement is reduced, and a data basis for evaluating the wall thickness uniformity of the main shaft is provided.

[0018] 2. The pneumatic lift provides a continuous, stable and accurately controlled contact force, which forms a good acoustic coupling by eliminating the air bubbles in the coupling agent, and does not cause wear of the probe or distortion of the measurement due to excessive pressure. At this time, the ideal contact state is maintained at all times, avoiding signal jumps and reading mutations caused by shaking and pressure fluctuations in manual measurement. In combination with the stabilizing effect of the radial anti-jump mechanism on the main shaft, any slight vibration of the main shaft in rotation is further reduced, providing a stable measurement environment for the ultrasonic probe, ensuring the clarity and stability of the echo signal, so that the thickness reading truly reflects the wall thickness change; finally, the stable support and drive of the mechanical structure ensure the accurate motion trajectory of the main shaft and the ultrasonic thickness measuring probe, and the pneumatic system provides flexible probe adjustment capability, and the overall scheme reduces human operation error, improves the repeatability and reliability of the measurement. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A schematic diagram of the three-dimensional structure of the embodiment of the present application Figure One ; Figure 2 A schematic diagram of the three-dimensional structure of the embodiment of the present application Figure Two ; Figure 3 A schematic diagram of the structure of the radial double-roller anti-jump mechanism in the embodiment of the present application Figure 4 A front view of the overall structure of the embodiment of the present application Figure 5 A perspective view of the overall structure of the embodiment of the present application Figure 6 A schematic diagram of the structure of the double-roller synchronous rolling structure in the embodiment of the present application Figure 7 An assembly drawing of the rotary driver and the double-roller synchronous rolling structure in the embodiment of the present application Figure 8 A schematic diagram of the structure of the double-roller synchronous rolling structure in the embodiment of the present application Figure 7 Figure 9 A perspective view of the double-belt linear traction structure in the embodiment of the present application

[0020] ​In the diagram: 1-Outer profile frame; 2-Upper lifting frame; 201-Straight groove; 202-U-shaped block; 203-Locking handle; 204-Stop bar; 3-Double roller synchronous rolling structure; 301-Lower support roller; 302-Sprocket drive structure one; 303-Gap; 4-Radial double roller anti-jump mechanism; 401-Square column; 402-Double sleeve type shaft frame; 403-Upper pressure roller; 404-First cylinder; 5-Rotary drive 501-Worm gear reducer; 502-Stepper motor; 503-Sprocket drive structure II; 6-Inner profile conveyor frame; 7-Pneumatic lifter; 701-Slide carriage; 702-Second cylinder; 703-Panel; 704-Right angle arm; 8-Ultrasonic thickness probe; 9-Double belt linear traction structure; 901-Front axle; 902-Rear axle; 903-Belt linear module; 10-Control panel. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] like Figures 1 to 4 As shown, a measuring device for the main shaft of an aero-engine turbojet engine includes an outer profile frame 1, an upper lifting frame 2 fixedly mounted on the top of the outer profile frame 1, a double-roller synchronous rolling structure 3 for supporting the main shaft and causing the main shaft to rotate around its axis installed inside the upper lifting frame 2, an inner profile conveying frame 6 installed inside the outer profile frame 1, a radial double-roller anti-jump mechanism 4 for limiting the main shaft is provided above the double-roller synchronous rolling structure 3, and a pneumatic lifter 7 is slidably mounted inside the inner profile conveying frame 6, with a super-elevator installed on the drive end of the pneumatic lifter 7. The ultrasonic thickness measuring probe 8 and the inner profile conveyor frame 6 are equipped with a double-belt linear traction structure 9 for driving the pneumatic lifter 7 and the ultrasonic thickness measuring probe 8 to move along the main shaft axis. The outer wall of one side of the upper lifting frame 2 is provided with a rotary driver 5 for outputting rotational power to the double-roller synchronous rolling structure 3 and the double-belt linear traction structure 9. The outer profile frame 1 is equipped with a control panel 10. The output end of the control panel 10 is electrically connected to the input end of the radial double-roller anti-jump mechanism 4, the rotary driver 5 and the pneumatic lifter 7.

[0023] like Figures 5-8 As shown, the dual-roll synchronous rolling structure 3 includes two lower support rollers 301 rotatably installed at the front and rear positions inside the upper lifting frame 2. A gap 303 is provided between the two lower support rollers 301, and the ends of the two lower support rollers 301 are connected by a sprocket transmission structure 302.

[0024] In the embodiment, the gap 303 provides space for linear movement of the ultrasonic thickness gauge probe 8 and contact with the spindle, and the two lower supporting shaft rollers 301 are connected by a chain wheel transmission structure 302, wherein one of the lower supporting shaft rollers 301 rotates to drive the other lower supporting shaft roller 301 to rotate through the cooperation of the chain wheel transmission structure 302.

[0025] The spindle is placed on the two lower supporting shaft rollers 301. Since the spindle is usually long and heavy, single-point or single-roller support can easily cause the spindle to swing or be eccentric during rotation, affecting the measurement accuracy. Through the synchronous rolling of the two lower supporting shaft rollers 301, the spindle obtains balanced support force, reducing deformation and vibration caused by gravity or uneven stress.

[0026] The radial double-roller anti-jumping mechanism 4 includes square columns 401 fixedly installed at the inside corners of the outer profile frame 1 and extending upward, double-sleeve type shaft racks 402 slidably installed on the two square columns 401 of the same side in the vertical direction, and two upper pressing rollers 403 rotatably installed between the opposite side outer walls of the two double-sleeve type shaft racks 402, with the two upper pressing rollers 403 located above the lower supporting shaft rollers 301.

[0027] One side outer wall of one of the square columns 401 is provided with a first air cylinder 404, and the bottom end of the piston rod of the first air cylinder 404 is fixedly connected with the top end of the corresponding double-sleeve type shaft rack 402.

[0028] One side outer wall of the square column 401 is fixedly provided with a vertical dovetail guide rail, and the double-sleeve type shaft rack 402 is provided with a sliding block in sliding connection with the dovetail guide rail, and the double-sleeve type shaft rack 402 is slidably installed on the square column 401 through the cooperation of the sliding block and the dovetail guide rail.

[0029] In this way, the output end of the control panel 10 is electrically connected with the input end of the first air cylinder 404 of the radial double-roller anti-jumping mechanism 4, the first air cylinder 404 is started by the control panel 10, the double-sleeve type shaft rack 402 is driven downward by the first air cylinder 404, and then the upper pressing rollers 403 between the two double-sleeve type shaft racks 402 are lowered to contact the outer wall of the spindle, the adjustment is made according to the specifications of the spindle, the upper pressing rollers 403 are tightly attached to the outer diameter of the spindle to form effective radial restraint force, preventing the spindle from radially deviating, thereby ensuring the stable contact of the ultrasonic thickness gauge probe 8.

[0030] One side outer wall of the upper lifting frame 2 is provided with a straight slot 201, the inside of the straight slot 201 is slidably provided with a U-shaped block 202, one side outer wall of the U-shaped block 202 is provided with a locking handle 203 for locking the U-shaped block 202 in the straight slot 201 of the upper lifting frame 2, and the other side outer wall of the U-shaped block 202 is fixedly provided with a blocking rod 204 for blocking one end of the spindle.

[0031] In this way, the U-shaped block 202 can be unlocked by locking the handle 203, and the position of the stop lever 204 can be adjusted by sliding the U-shaped block 202 in the straight slot 201, so that the end of the main shaft can be conveniently limited, different lengths of the main shaft can be adapted, and the axial movement of the main shaft during rotation can be reduced.

[0032] The rotary driver 5 comprises a worm gear reducer 501 mounted on the outer wall of one side of the lifting frame 2, and a stepping motor 502 fixedly installed on the back of the shell of the worm gear reducer 501. The power output end of the stepping motor 502 is in transmission connection with the power input end of the worm gear reducer 501.

[0033] The worm gear reducer 501 has two power output ends, one of which is in transmission connection with the corresponding lower supporting shaft roller 301, and the other of which is in transmission connection with the chain wheel transmission structure two 503.

[0034] In this embodiment, the stepping motor 502 starts to output rotary power to one of the lower supporting shaft rollers 301 through the worm gear reducer 501, and at this time, the two lower supporting shaft rollers 301 keep the same direction and speed of rotation under the transmission connection of the chain wheel transmission structure one 302.

[0035] When the rotary driver 5 works, the stepping motor 502 works according to the direction, speed, angle, and response time set by the control panel 10, and at this time, the stepping motor 502 transmits power to the double-roller synchronous rolling structure 3 and the double-belt linear traction structure 9 through the worm gear reducer 501 and the chain wheel transmission structure two 503.

[0036] As shown in Figures 7-9 The double-belt linear traction structure 9 comprises a front shaft 901 and a rear shaft 902 rotatably installed at the left and right positions inside the inner profile conveying frame 6, and two belt linear modules 903 are installed between the front shaft 901 and the rear shaft 902, wherein the front shaft 901 is in transmission connection with the other end of the chain wheel transmission structure two 503.

[0037] In this way, the stepping motor 502 starts to drive the worm gear reducer 501 to work, and inputs rotary power to the front shaft 901 in the double-belt linear traction structure 9 and drives it to rotate through the chain wheel transmission structure two 503, and at this time, the belt linear module 903 between the front shaft 901 and the rear shaft 902 drives the pneumatic lifter 7 and the ultrasonic thickness gauge 8 to move along the main shaft axis direction until the ultrasonic thickness gauge 8 detects a complete main shaft, so as to ensure the continuity of the thickness measurement process, avoid the ultrasonic thickness gauge 8 from shaking or deviating during the movement, and ensure the accuracy of the measurement data.

[0038] In the embodiment, the chain wheel transmission structure two 503 comprises a main chain wheel installed on the power output end of the worm gear reducer 501, a secondary chain wheel fixedly installed on the outer surface of the front shaft 901, and a transmission chain installed between the main chain wheel and the secondary chain wheel.

[0039] The pneumatic lifter 7 comprises a sliding frame 701 slidingly installed on the top of the inner profile conveying frame 6, a second cylinder 702 installed inside the sliding frame 701, a supporting plate 703 fixedly installed at the top end of the piston rod of the second cylinder 702, and the ultrasonic thickness measuring probe 8 installed at the top end of the supporting plate 703.

[0040] A right-angle arm 704 is fixedly installed at each corner position of the top end of the sliding frame 701, and the other side wall of the right-angle arm 704 is fixedly connected with a belt in the belt linear module 903.

[0041] In this way, the second cylinder 702 drives the supporting plate 703 and the ultrasonic thickness measuring probe 8 to move upwards until the ultrasonic thickness measuring probe 8 is in contact with the outer wall of the main shaft through the gap part 303.

[0042] In the embodiment, the overall structure of the belt linear module 903 comprises a belt and a belt roller, the belt roller is fixedly installed on the front shaft 901 and the rear shaft 902 respectively, and the belt is sleeved on the belt roller.

[0043] As shown in Figures 1-9 The present application also provides a kind of measurement method of aviation turbojet engine main shaft, based on above-mentioned aviation turbojet engine main shaft measuring equipment, comprising the following steps: S101: staff adjusts the position of the radial double-roller anti-bounce mechanism 4 by inputting parameters through the control panel 10 according to the model and specification of the main shaft, the radial double-roller anti-bounce mechanism 4 applies appropriate pressure from the upper two sides of the main shaft, and the stable constraint platform is formed together with the lower double-roller synchronous rolling structure 3, and the ultrasonic thickness measuring probe 8 is slowly raised by the pneumatic lifter 7 until the probe is in contact with the lower surface of the outer wall of the main shaft.

[0044] In step S101, the staff needs to clean the spindle before placing it on the double-roller synchronous rolling structure 3. Use non-woven fabric and high-purity cleaning agent to remove all oil stains, dust and metal chips from the outer surface and inner hole of the spindle. Then place the spindle on the double-roller synchronous rolling structure 3, and then check the ultrasonic thickness gauge probe 8, calibrate the zero position, and evenly apply a layer of sufficient special coupling agent on the top of the probe.

[0045] In step S101, the radial double-roller anti-jumping mechanism 4 applies appropriate pressure from the upper two sides of the spindle, together with the double-roller synchronous rolling structure 3 below to form a stable constraint platform, effectively suppressing the radial jumping or vibration of the spindle during rotation, while ensuring that the central axis of the spindle remains parallel to the scanning track of the subsequent ultrasonic thickness gauge probe 8.

[0046] S102: Send work instructions to the rotary driver 5 through the control panel 10, and drive the double-roller synchronous rolling structure 3 to work by the rotary driver 5, driving the spindle to rotate uniformly and stably around its own axis, while the double-belt linear traction structure 9 drives the entire pneumatic lifter 7 and ultrasonic thickness gauge probe 8 to move slowly and continuously in a straight line along a direction parallel to the spindle axis, at this time the motion track of the ultrasonic thickness gauge probe 8 relative to the surface of the spindle becomes a regular spiral.

[0047] The working principle of the rotary driver 5 in step S102 is that the stepper motor 502 works according to the direction, speed, angle, response time set by the control panel 10, at this time the stepper motor 502 drives the worm gear reducer 501 to work, the two power output ends of the worm gear reducer 501 output synchronous rotary power, one of which drives the double-belt linear traction structure 9 to work through the chain wheel transmission structure two 503, the other drives the corresponding lower shaft roller 301 to rotate, and the two lower shaft rollers 301 keep the same direction and speed of rotation under the transmission connection of the chain wheel transmission structure one 302.

[0048] The working principle of the double-belt linear traction structure 9 in step S102 is that the worm gear reducer 501 drives the front shaft 901 to rotate through the chain wheel transmission structure two 503, at this time the belt linear module 903 between the front shaft 901 and the rear shaft 902 will drive the pneumatic lifter 7 and the ultrasonic thickness gauge probe 8 to move along the spindle axis direction, until the ultrasonic thickness gauge probe 8 detects a complete spindle, thereby ensuring the continuity of the thickness measurement process, avoiding the ultrasonic thickness gauge probe 8 from shaking or deviating during the movement process, and ensuring the accuracy of the measurement data.

[0049] S103: During the scanning process, the ultrasonic thickness measuring probe 8 continuously emits ultrasonic pulses and receives echoes, and the instrument connected with the ultrasonic thickness measuring probe 8 calculates and records the thickness data of each measuring point in real time, which is one-to-one corresponding to the axial position and circumferential angle coordinates of the probe, and is synchronously stored into the computer system.

[0050] S104: After the ultrasonic thickness measuring probe 8 completes the length scanning of the whole main shaft, the staff can adjust the initial contact position of the main shaft and the ultrasonic thickness measuring probe 8, and then perform a measurement operation again, or stop the equipment, reset the components, and use the lifting equipment to lift the measured main shaft away from the work station.

[0051] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A measuring device for the main shaft of an aero-turbojet engine, characterized in that: The system includes an outer profile frame (1), an upper lifting frame (2) fixedly installed at the top of the outer profile frame (1), a double-roller synchronous rolling structure (3) for supporting the main shaft and causing the main shaft to rotate around the axis is installed inside the upper lifting frame (2), an inner profile conveyor frame (6) is installed inside the outer profile frame (1), a radial double-roller anti-jump mechanism (4) for limiting the main shaft is set above the double-roller synchronous rolling structure (3), a pneumatic lifter (7) is slidably installed inside the inner profile conveyor frame (6), an ultrasonic thickness probe (8) is installed on the drive end of the pneumatic lifter (7), and the inner profile... The conveyor frame (6) is equipped with a double-belt linear traction structure (9) for driving the pneumatic lifter (7) and the ultrasonic thickness probe (8) to move along the main shaft axis. The outer wall of the upper frame (2) is provided with a rotary driver (5) for outputting rotational power to the double-roller synchronous rolling structure (3) and the double-belt linear traction structure (9). The outer profile frame (1) is equipped with a control panel (10). The output end of the control panel (10) is electrically connected to the radial double-roller anti-jump mechanism (4), the rotary driver (5) and the input end of the pneumatic lifter (7).

2. The measuring device for the spindle of an aero-turbojet engine according to claim 1, characterized in that: The dual-roll synchronous rolling structure (3) includes two lower support rollers (301) rotatably installed at the front and rear positions inside the upper lifting frame (2). A gap (303) is provided between the two lower support rollers (301), and the ends of the two lower support rollers (301) are connected by a sprocket transmission structure (302).

3. The measuring device for the main shaft of an aero-turbojet engine according to claim 2, characterized in that: The radial double roller anti-jump mechanism (4) includes a square column (401) fixedly installed at the inner corner of the outer profile frame (1) and extending upward. Two square columns (401) on the same side are slidably installed with double sleeve shaft frames (402) in the vertical direction. Two upper pressure rollers (403) are rotatably installed between the opposite outer walls of the two double sleeve shaft frames (402). The two upper pressure rollers (403) are located above the lower support shaft roller (301). A first cylinder (404) is installed on one outer wall of one of the square columns (401). The bottom end of the piston rod of the first cylinder (404) is fixedly connected to the top end of the corresponding double sleeve shaft frame (402).

4. The measuring device for the main shaft of an aero-turbojet engine according to claim 3, characterized in that: A dovetail guide rail extending vertically is fixedly installed on one side of the outer wall of the square column (401). A slider is installed on the double-sleeve shaft frame (402). The double-sleeve shaft frame (402) is slidably installed on the square column (401) through the cooperation of the slider and the dovetail guide rail.

5. The measuring device for the main shaft of an aero-turbojet engine according to claim 2, characterized in that: A straight slot (201) is provided on one side of the outer wall of the upper lifting frame (2). A U-shaped block (202) is slidably installed inside the straight slot (201). A locking handle (203) is provided on one side of the outer wall of the U-shaped block (202). The locking handle (203) is used to lock the U-shaped block (202) in the straight slot (201) of the upper lifting frame (2). A stop bar (204) is fixed on the other side of the outer wall of the U-shaped block (202). The stop bar (204) is used to abut one end of the main shaft.

6. The measuring device for the main shaft of an aero-turbojet engine according to claim 2, characterized in that: The rotary driver (5) includes a worm gear reducer (501) mounted on the outer wall of one side of the upper lifting frame (2). A stepper motor (502) is connected to the power input end on the back of the worm gear reducer (501). The worm gear reducer (501) has two power output ends. One power output end is connected to the corresponding lower support roller (301), and the other power output end is connected to a sprocket drive structure two (503).

7. The measuring device for the spindle of an aero-turbojet engine according to claim 6, characterized in that: The dual-belt linear traction structure (9) includes a front axle (901) and a rear axle (902) rotatably installed at left and right positions inside the inner profile conveyor frame (6). Two belt linear modules (903) are installed between the front axle (901) and the rear axle (902), wherein the front axle (901) is connected to the other end of the sprocket drive structure (503).

8. The measuring device for the spindle of an aero-turbojet engine according to claim 7, characterized in that: The pneumatic lifter (7) includes a slide (701) that is slidably installed on the top of the inner profile conveyor (6). A second cylinder (702) is installed inside the slide (701). A support plate (703) is fixedly installed on the top of the piston rod of the second cylinder (702). Right-angle arms (704) are fixedly installed at the corners of the top of the slide (701). The other side wall of the right-angle arm (704) is fixedly connected to the belt in the belt linear module (903). An ultrasonic thickness probe (8) is installed on the top of the support plate (703).

9. The measuring device for the main shaft of an aero-turbojet engine according to claim 7, characterized in that: The second sprocket transmission structure (503) includes a main sprocket mounted on the power output end of the worm gear reducer (501), a secondary sprocket fixedly mounted on the outer surface of the front axle (901), and a transmission chain installed between the main sprocket and the secondary sprocket.

10. A method for measuring the main shaft of an aero-turbojet engine, based on the aero-turbojet engine main shaft measuring device according to any one of claims 1-9, characterized in that: Includes the following steps: S101: According to the model and specifications of the spindle, the staff inputs parameters through the control panel (10) and adjusts the position of the radial double roller anti-jump mechanism (4). The radial double roller anti-jump mechanism (4) applies appropriate pressure from both sides above the spindle, and together with the lower double roller synchronous rolling structure (3), it forms a stable constraint platform. The pneumatic lifter (7) carries the ultrasonic thickness probe (8) to slowly rise until the probe contacts the lower surface of the outer wall of the spindle. S102: The control panel (10) sends a working command to the rotary driver (5), which drives the double roller synchronous rolling structure (3) to work, causing the main shaft to start rotating at a constant speed and smoothly around its own axis. At the same time, the double belt linear traction structure (9) drives the entire pneumatic lifter (7) and the ultrasonic thickness probe (8) to move slowly and continuously in a straight line along a direction parallel to the axis of the main shaft. At this time, the motion trajectory of the ultrasonic thickness probe (8) relative to the surface of the main shaft becomes a regular spiral line. S103: During the scanning process, the ultrasonic thickness probe (8) continuously emits ultrasonic pulses and receives echoes. The instrument connected to the ultrasonic thickness probe (8) calculates and records the thickness data of each measurement point in real time. This data corresponds one-to-one with the axial position and circumferential angle coordinates of the probe and is stored synchronously in the computer system. S104: After the ultrasonic thickness probe (8) completes the length scan of the entire spindle, the operator can adjust the initial contact position between the spindle and the ultrasonic thickness probe (8) and perform another measurement operation, or stop the equipment, reset all components, and use lifting equipment to lift the completed spindle away from the work station.

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