Ultra-precision laser automatic weight removal dynamic balancing machine for micro turbojet engine rotors

Abstract

The present invention relates to an ultra-precision laser automatic de-weighting dynamic balancing machine for a micro-turbojet engine rotor, which is mainly composed of an equipment base, a rotor support mechanism, a vibration transmission mechanism, an unbalance detection mechanism, a reference phase detection mechanism, an air supply mechanism, a laser automatic de-weighting mechanism and a powder recovery mechanism. The rotor support mechanism is fixed on the vibration transmission mechanism, and the two are integrally installed on a slide rail fixed to the equipment base. The laser automatic de-weighting mechanism includes a mechanical arm, a laser de-weighting light source, a laser positioning light source, and a laser positioning receiving end. The high-pressure air drive mechanism includes an air compressor, a gas storage tank, a gas nozzle, a solenoid valve, and a pressure regulating valve. The powder recovery mechanism includes a dust suction head, an air pump, a connecting pipe, and a powder collection barrel, wherein the dust suction head, the air pump, and the connecting pipe. The ultra-precision balancing machine proposed by the present invention is suitable for the high-precision dynamic balancing of the micro-turbojet engine rotor, and is driven by high-pressure air to simulate the running state of the rotor.

Description

Technical Field

[0001] The invention relates to automatic dynamic balancing equipment, in particular to an ultra-precision laser automatic weight-removing dynamic balancing machine for a micro turbojet engine rotor. Background Art

[0002] Micro turbojet engines have the characteristics of high energy storage density and high power-to-weight ratio, which meet the development requirements of future micro air vehicles. The rotor of a micro turbojet engine is its core component, and its state during engine operation will directly affect the operation state of the entire flight equipment.

[0003] During the actual production, assembly and operation of the rotor, due to factors such as uneven materials, errors during processing or assembly, design reasons, and wear during operation, a certain amount of imbalance will be generated on the rotor, which will cause it to produce periodically changing centrifugal inertia force. Since the micro turbojet engine operates at an extremely high speed, even if the imbalance is very small, the centrifugal inertia force generated at such a high speed cannot be underestimated. In summary, the rotor will inevitably be in an unbalanced state during operation, causing vibration, noise, increased wear, affecting the life of the engine, and even causing catastrophic accidents.

[0004] Since the micro turbojet engine has an extremely high speed, which is between the first and second order speeds, it is a typical flexible rotor. Due to the particularity and complexity of the flexible rotor, there is currently no universal commercial balancing machine to solve its dynamic balancing problem. At the same time, due to its small size, conventional deweighting methods may damage its structure, and it is difficult to achieve tiny material removal on the correction surface. Therefore, it is very necessary to design a suitable ultra-precision automatic deweighting balancing device for this micro turbojet engine rotor. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide an ultra-precision laser automatic deweighting dynamic balancing machine for micro turbojet engine rotors that can overcome the shortcomings of existing balancing equipment such as low balancing efficiency, low balancing accuracy, and difficulty in balancing micro flexible rotors, thereby effectively improving the balancing efficiency and accuracy of micro turbojet engine rotors.

[0006] The technical scheme for achieving the purpose of the present invention is: an ultra-precision laser automatic de-weighting dynamic balancing machine for a micro-turbojet engine rotor, comprising an equipment base, a rotor support mechanism, a vibration transmission mechanism, a reference phase detection mechanism, a high-pressure air drive mechanism and a laser automatic de-weighting mechanism; the vibration transmission mechanism is slidably mounted on a slide rail fixed on the equipment base; the rotor support mechanism is fixedly mounted on the vibration transmission mechanism through a support swing frame; the high-pressure air drive mechanism drives the rotor to rotate; the reference phase detection mechanism is composed of an optical fiber sensor and an optical fiber sensor fixture, the optical fiber sensor is fixed on the optical fiber sensor fixture, the optical fiber sensor fixture is magnetic and is adsorbed on the sensor bracket slidably placed on the slide rail on the equipment base; the laser automatic de-weighting mechanism comprises a mechanical arm, a laser de-weighting light source, a laser positioning light source, a laser positioning receiving end and an axial motion platform; wherein the laser de-weighting light source is fixed on the mechanical arm, and the mechanical arm is slidably arranged on the axial motion platform; the laser positioning light source is fixed on the motion platform of the mechanical arm, and the laser positioning receiving end is positioned on the slide rail where the rotor support mechanism and the vibration transmission mechanism are located.

[0007] The rotor supporting mechanism described in the above technical solution uses two supporting rollers to support the rotor, and the supporting rollers are fixed on the roller frame; a height-adjustable roller skateboard is installed above the rotor, and the bottom of the roller on the roller skateboard is abutted against the upper end of the rotor; the roller skateboard is adjusted in vertical height by bolts and elongated holes.

[0008] The vibration transmission mechanism described in the above technical solution consists of a spring plate, a vibration bridge, and a vibration base, which is used to transmit the vibration caused by the rotor; wherein the vibration base is installed on the slide rail, and its position on the slide rail can be adjusted to meet the balancing requirements of rotors of different lengths.

[0009] The above technical solution also has an unbalance detection mechanism; the unbalance detection mechanism includes an acceleration sensor, a data acquisition card, a measurement circuit and a computer; wherein, one acceleration sensor is provided at each of the left and right ends, the left acceleration sensor and the right acceleration sensor are installed on the corresponding spring plates through a magnetic base, and the data acquisition card, the measurement circuit and the computer are integrated in the electric control cabinet.

[0010] The high-pressure air drive mechanism described in the above technical solution includes an air compressor, an air storage tank and a gas nozzle; the gas nozzle faces the blades of the rotor.

[0011] The above technical solution also has a powder recovery mechanism; the powder recovery mechanism includes a dust collector head, an air pump, a connecting pipe and a powder collection bucket, wherein the dust collector head, the air pump and the connecting pipe are all fixed on the robotic arm. As the robotic arm moves, the dust collector head and the laser de-weighting light source face the same area. During the laser de-weighting process, the processed powder is sucked into the powder collection bucket.

[0012] In the above technical solution, an angle sensor is installed in the robot arm.

[0013] The gas nozzle in the above technical solution comprises a first pneumatic air blowing head and a second pneumatic air blowing head; the first pneumatic air blowing head and the second pneumatic air blowing head are symmetrically arranged on both sides of the rotor circumferential direction through corresponding first air blowing head brackets and second air blowing head brackets.

[0014] In the above technical solution, the electric control cabinet includes a data acquisition card, a measuring circuit, a control mechanism, a computer mechanism, and a human-machine interface to collect and process the data of each sensor of the mechanism, calculate the imbalance and phase, and output a control signal.

[0015] After adopting the above technical solution, the present invention has the following positive effects:

[0016] (1) The present invention adopts laser deweighting to avoid damaging its effective structure, and can achieve precise balance correction on a tiny correction surface, thereby improving the balance accuracy and balance efficiency;

[0017] (2) The present invention uses high-pressure gas to drive the rotor to rotate, which well simulates the actual operating state of the rotor and can achieve high-speed driving to dynamically balance the rotor at a certain speed;

[0018] (3) The present invention uses various sensors and automation equipment in the driving of the rotor, the identification and extraction of the imbalance, and the correction of the rotor, which can realize the automatic identification and correction of the rotor imbalance, change the conventional manual correction method in the past, realize the automation of dynamic balancing, and improve the balancing efficiency and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments and in conjunction with the accompanying drawings, wherein

[0020] Figure 1 This is the overall structural diagram of the ultra-precision laser automatic de-weighting dynamic balancing equipment of the present invention;

[0021] Figure 2 It is a front view of the ultra-precision laser automatic de-weighting dynamic balancing equipment of the present invention;

[0022] Figure 3 This is the right view of the ultra-precision laser automatic deweighting and balancing equipment of the present invention. DETAILED DESCRIPTION

[0023] (Example 1)

[0024] See Figures 1 to 3The present invention is mainly composed of a base, a rotor supporting mechanism, a vibration transmission mechanism, an unbalance detection mechanism, a reference phase detection mechanism, an air supply mechanism, a laser automatic deweighting mechanism, and a powder recovery mechanism.

[0025] The rotor support mechanism is fixed to the vibration transmission mechanism by screws. The vibration base 4 of the vibration transmission mechanism is installed on the slide rail 2 fixed to the equipment base 1. It can move axially on the slide rail 2. The distance between the two support mechanisms can be adjusted to meet the balancing requirements of rotors with different axial sizes. The height of the roller frame 23 is adjusted through bolts and elongated holes, thereby adjusting the height of the support roller 24 of the rotor support mechanism to meet the balancing requirements of rotors with different shaft diameters. Finally, the roller at the top is adjusted to limit the rotor. The operator installs the micro-turbojet engine rotor 13 to be balanced on the rotor support mechanism.

[0026] The high-pressure air drive mechanism includes an air compressor 21, an air storage tank 10, a gas nozzle 12, a solenoid valve, and a pressure regulating valve. In the initial stage of balancing, the control mechanism sends a control signal, the air compressor 21 starts to work, generates high-pressure gas, and uses two symmetrical gas nozzles to spray toward the turbine blades, thereby driving the rotor 13 to move. The corresponding parameters are set on the human-machine interface of the control cabinet. The control mechanism adjusts the pressure of the ejected gas by adjusting the pressure regulating valve, thereby adjusting the speed of the rotor 13. The solenoid valve can control the on-off of the entire air circuit. The gas nozzle has a first pneumatic blowing head 9 and a second pneumatic blowing head 12; the first pneumatic blowing head 9 and the second pneumatic blowing head 12 are symmetrically arranged on both sides of the circumferential direction of the rotor 13 through the corresponding first blowing head bracket 8 and the second blowing head bracket 11.

[0027] The unbalance detection mechanism and the reference phase detection mechanism include an accelerometer 22 at the left end, an accelerometer 22 at the right end, a data acquisition card, a measurement circuit, a computer mechanism, an optical fiber sensor 17 and its fixture, which are mainly used to detect the original vibration and phase information of the rotor 13 to be corrected. The accelerometer 22 collects the acceleration information of the corresponding position, and the optical fiber sensor 17 detects the speed signal of the rotor 13 to obtain a pulse signal. The generated data is converted into an electrical signal and transmitted to the data acquisition card. The unbalance amount and its phase information are calculated through the measurement circuit, and the results are displayed on the human-computer interaction interface. The corresponding balancing strategy is generated, and the control mechanism generates a corresponding control signal to control the laser automatic de-weighting mechanism for automatic correction. The optical fiber sensor 17 is fixed on the optical fiber sensor fixture 18, which is magnetic and adsorbed on the sensor bracket 3 slidably placed on the slide rail 2 on the equipment base 1.

[0028] The control mechanism controls the solenoid valve to disconnect, that is, controls the high-pressure air driving mechanism to stop working.

[0029] The laser automatic de-weighting mechanism includes a mechanical arm 14, a laser de-weighting light source 27, a laser positioning light source 15, a laser positioning receiving end 20, and an axial motion platform 26. The laser positioning receiving end 20 is fixed on the rotor support mechanism to perform axial positioning of the entire laser automatic de-weighting mechanism. The mechanical arm 14 can move on the axial motion platform 26 through a worm gear, and according to the control instructions of the control mechanism, it reaches the position of the required balance plane, and then adjusts the posture of the mechanical arm 14 to make the laser de-weighting light source 27 reach the specified position. Then the laser de-weighting light source 27 works according to the instructions, generates high-energy laser, and performs laser automatic de-weighting on the rotor 13. By controlling the laser wavelength and power and the action time, the appropriate mass at the specified position is removed.

[0030] The powder recovery mechanism includes a vacuum head 28, an air pump, and a connecting pipe 16. The vacuum head 28 is parallel to the laser de-duplication light source 27 and faces the same area. After the laser de-duplication light source 27 works for a short time, the air pump is turned on and the vacuum head 28 absorbs the processing powder and reaches the powder collection bucket through the connecting pipe 16, thereby avoiding the influence of powder on processing quality and balancing the on-site environment.

[0031] Restart the high-pressure air drive mechanism to drive the rotor 13, and measure the residual unbalance and phase of the balanced rotor 13 through the unbalance detection mechanism and the reference phase detection mechanism. If the required accuracy is not achieved, repeat the above balancing steps to further balance the rotor 13. If not, output a success signal on the human-computer interaction interface and display the residual unbalance and phase.

[0032] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An ultra-precision laser automatic weight removal dynamic balancing machine for a micro turbojet engine rotor, characterized in that: The invention comprises an equipment base, a rotor support mechanism, a vibration transmission mechanism, a reference phase detection mechanism, a high-pressure air drive mechanism and a laser automatic deweighting mechanism; the vibration transmission mechanism is slidably mounted on a slide rail (2) fixed on the equipment base (1); the rotor support mechanism is fixedly mounted on the vibration transmission mechanism via a support swing frame (7); the high-pressure air drive mechanism drives the rotor (13) to rotate; the reference phase detection mechanism is composed of an optical fiber sensor (17) and an optical fiber sensor fixture (18); the optical fiber sensor (17) is fixed on the optical fiber sensor fixture (18); the optical fiber sensor fixture (18) has a magnetic The sensor bracket (3) is attached to the equipment base (1) and slidably placed on the slide rail (2); the laser automatic de-weighting mechanism comprises a mechanical arm (14), a laser de-weighting light source (27), a laser positioning light source (15), a laser positioning receiving end (20) and an axial motion platform (26); wherein the laser de-weighting light source (27) is fixed on the mechanical arm (14), and the mechanical arm (14) is slidably arranged on the axial motion platform (26); the laser positioning light source (15) is fixed on the motion platform of the mechanical arm (14), and the laser positioning receiving end (20) is positioned on the slide rail (2) where the rotor support mechanism and the vibration transmission mechanism are located; The rotor support mechanism uses two supporting rollers (24) to support the rotor (13), and the supporting rollers (24) are fixed on the roller frame (23); a height-adjustable roller slide (25) is installed above the rotor (13), and the bottom of the roller on the roller slide (25) abuts against the upper end of the rotor (13); the vertical height of the roller slide (25) is adjusted by the combination of bolts and elongated holes; The high-pressure air drive mechanism comprises an air compressor (21), an air storage tank (10) and a gas nozzle; the gas nozzle faces the blades of the rotor (13).

2. The ultra-precision laser automatic weight removal dynamic balancing machine for a micro turbojet engine rotor according to claim 1, characterized in that: The vibration transmission mechanism comprises a spring plate (5), a vibration bridge (6), and a vibration base (4), and is used to transmit the vibration caused by the rotor (13); wherein the vibration base (4) is mounted on the slide rail (2), and its position on the slide rail (2) can be adjusted to meet the balancing requirements of rotors (13) of different lengths.

3. The ultra-precision laser automatic weight removal dynamic balancing machine for a micro turbojet engine rotor according to claim 2, characterized in that: It also has an unbalance detection mechanism; the unbalance detection mechanism comprises an acceleration sensor (22), a data acquisition card, a measurement circuit and a computer; wherein one acceleration sensor (22) is provided at each of the left and right ends, the left acceleration sensor (22) and the right acceleration sensor (22) are mounted on corresponding spring plates (5) via a magnetic base, and the data acquisition card, the measurement circuit and the computer are integrated in an electric control cabinet (19).

4. The ultra-precision laser automatic weight removal dynamic balancing machine for a micro turbojet engine rotor according to claim 1, characterized in that: It also has a powder recovery mechanism; the powder recovery mechanism comprises a dust collector head (28), an air pump, a connecting pipe (16) and a powder collection bucket, wherein the dust collector head (28), the air pump and the connecting pipe (16) are all fixed on the robot arm (14). As the robot arm (14) moves, the dust collector head (28) and the laser de-weighting light source (27) face the same area. During the laser de-weighting process, the processed powder is sucked into the powder collection bucket.

5. The ultra-precision laser automatic weight removal dynamic balancing machine for a micro turbojet engine rotor according to claim 1, characterized in that: An angle sensor is installed in the mechanical arm (14).

6. The ultra-precision laser automatic weight removal dynamic balancing machine for a micro turbojet engine rotor according to claim 1, characterized in that: The gas nozzle comprises a first pneumatic air blowing head (9) and a second pneumatic air blowing head (12); the first pneumatic air blowing head (9) and the second pneumatic air blowing head (12) are symmetrically arranged on both sides of the rotor (13) in a circumferential direction via corresponding first air blowing head brackets (8) and second air blowing head brackets (11).

7. The ultra-precision laser automatic weight removal dynamic balancing machine for a micro turbojet engine rotor according to claim 1, characterized in that: The electric control cabinet (19) comprises a data acquisition card, a measuring circuit, a control mechanism, a computer mechanism, and a human-machine interface, so as to collect and process the data of various sensors of the mechanism, calculate the unbalance amount and phase, and output a control signal.

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