Belt slipping real-time judgment device used in speed increasing and decreasing process of cyclic fatigue test of turbine engine

Abstract

The utility model relates to a belt slip real-time determination device used in a turbine engine cyclic fatigue test speed increasing and decreasing process. The belt slip real-time determination device comprises a driving motor, a high-speed belt, a belt speed increasing box, a transmission shaft system, a test wheel disc, a rotating speed sensor, a motor encoder, a pulse distribution plate, a PLC pulse acquisition module, a PLC CPU module, a driving frequency converter and a vacuum test cabin. According to the utility model, the two groups of rotating speed signals are both sent to the same PLC pulse acquisition module, so that the synchronism of the two groups of rotating speed signals for comparison can be ensured, and misjudgment on slipping caused by a speed difference value generated by a communication time difference between a given rotating speed and an actual rotating speed is avoided; the defects of the belt slipping phenomenon judgment technology in the speed increasing and decreasing process in the existing turbine engine cyclic fatigue test are overcome.

Description

Technical Field

[0001] This utility model belongs to the field of cable insulation technology, and specifically relates to a real-time detection device for belt slippage during acceleration and deceleration in a turbine engine cyclic fatigue test. Background Technology

[0002] In recent years, due to foreign technological blockades and the needs of China's aerospace industry development, the localization of testing equipment for turbine engine performance testing has become increasingly important. Among these tests, the cyclic fatigue test of turbine engine disks is a crucial one. In the cyclic fatigue test of turbine engine disks, the turbine engine disk speed is typically between 500 rpm and greater than 10,000 rpm, with repeated acceleration and deceleration over a long period. This test needs to be conducted on a dedicated vertical high-speed test bench.

[0003] Belt drive is a common transmission method in vertical high-speed testing rigs. A dedicated high-speed belt is attached to the output shaft of a drive motor at one end and to the input shaft of a belt speed increaser at the other. This drives the drive motor to rotate the belt speed increaser, which in turn rotates the test specimen to complete the fatigue test. Due to changes in the belt's inherent properties, slippage is prone to occur during long-term use. If this is not detected and stopped in time, the vibrations caused by slippage can easily damage the test specimen, leading to significant financial losses. Therefore, accurate monitoring and judgment of belt slippage during testing, especially during acceleration and deceleration, is crucial.

[0004] Currently, the main method used in China to determine belt slippage is to compare the given speed with the actual speed. However, this method is limited by communication speed and there is a time difference, causing the given speed and the actual speed to be out of sync in the system monitoring. During acceleration and deceleration, the system makes a misjudgment of slippage, resulting in abnormal termination of the test and loss of manpower and financial resources. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a real-time judgment device for belt slippage during the acceleration and deceleration process of a turbine engine cyclic fatigue test. It can make an accurate judgment when belt slippage occurs in the belt drive of a vertical high-speed test bench and feed back the slippage alarm signal to the system for protective shutdown, so as to avoid damage to the test piece and better complete the cyclic fatigue test.

[0006] The technical problem solved by this utility model is achieved through the following technical solution:

[0007] A device for real-time determination of belt slippage during acceleration and deceleration in a cyclic fatigue test of a turbine engine includes a drive motor, a high-speed belt, a belt speed increaser, a transmission shaft system, a test wheel, a speed sensor, a motor encoder, a pulse distribution board, a PLC pulse acquisition module, a PLC CPU module, a drive frequency converter, and a vacuum test chamber.

[0008] The output shaft end of the drive motor is connected to the input shaft end of the belt speed increaser via a high-speed belt. The lower end of the belt speed increaser is connected to the transmission shaft system via a connector. A test wheel is installed at the lower end of the transmission shaft system and the test wheel is placed inside the vacuum test chamber.

[0009] A speed sensor is installed on the belt speed increaser. The speed sensor extends into the belt speed increaser to measure the speed of the test wheel on the output side of the transmission shaft system and transmits the generated test wheel speed signal to the first input port of the PLC pulse acquisition module. A motor encoder is installed on the non-output shaft end of the drive motor. The motor encoder acquires the speed of the drive motor and transmits the acquired speed signal to the pulse distribution board. The pulse distribution board divides the drive motor speed signal into two identical speed signals and transmits them to the second input port of the PLC pulse acquisition module and the drive inverter, respectively. The PLC CPU module calculates the two speed signals acquired by the PLC pulse acquisition module. If the difference is within 20 rpm, it issues a normal operation command to the drive inverter. When the difference is greater than 20 rpm, it issues a protective stop command to the drive inverter. The drive inverter controls the drive motor to adjust its working state accordingly.

[0010] Moreover, the speed sensor is installed near the middle of the drive shaft of the belt speed increaser.

[0011] The advantages and beneficial effects of this utility model are as follows:

[0012] 1. The two sets of speed signals used in this utility model are sent to the same PLC pulse acquisition module, which can ensure the synchronization of the two sets of speed signals used for comparison, avoid the speed difference caused by the communication time difference between the given speed and the actual speed, and make up for the shortcomings of the current turbine engine cyclic fatigue test in judging belt slippage during acceleration and deceleration.

[0013] 2. When belt slippage occurs, the rotational speed of the test piece will change significantly. At this time, there will be a significant difference between the test wheel speed signal and the drive motor speed signal * transmission ratio. When belt slippage occurs in the belt drive of the vertical high-speed test bench, it can make an accurate judgment and feed back the slippage alarm signal to the system to perform protective shutdown, avoid damage to the test piece, and better complete the cyclic fatigue test.

[0014] 3. This utility model has a simple structure, requiring only the addition of a pulse distribution board to the original structure to send the drive motor speed signal to the PLC pulse acquisition module. It is low in cost and easy to operate. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Explanation of reference numerals in the attached figures

[0017] 1. Drive motor; 2. High-speed belt; 3. Belt speed increaser; 4. Transmission shaft system; 5. Test wheel; 6. Speed ​​sensor; 7. Motor encoder; 8. Pulse distribution board; 9. PLC pulse acquisition module; 10. PLC CPU module; 11. Drive frequency converter; 12. Vacuum test chamber. Detailed Implementation

[0018] The present invention will be further described in detail below through specific embodiments. The following embodiments are only descriptive and not limiting, and should not be used to limit the protection scope of the present invention.

[0019] An innovative device for real-time determination of belt slippage during acceleration and deceleration in a cyclic fatigue test of a turbine engine includes: a drive motor 1, a high-speed belt 2, a belt speed increaser 3, a transmission shaft system 4, a test wheel 5, a speed sensor 6, a motor encoder 7, a pulse distribution board 8, a PLC pulse acquisition module 9, a PLC CPU module 10, a drive frequency converter 11, and a vacuum test chamber 12.

[0020] The vacuum test chamber 12 is a container for cyclic fatigue testing, used to ensure a vacuum environment during the test;

[0021] The drive motor 1 is the driving device for the entire test. A motor encoder 7 is installed on its non-output end to measure the actual speed of the motor during operation.

[0022] The drive inverter 11 is the control device for the drive motor 1. It controls the start, stop, rotation direction, and rotation speed of the drive motor. In the speed control mode with encoder feedback, the drive inverter needs a set of drive motor speed signals to participate in the control.

[0023] The high-speed belt 2 serves as a transmission component, which flexibly connects the output shaft of the drive motor 1 to the input shaft of the belt speed increaser 3, thereby enabling the drive motor 1 to drive the belt speed increaser 3 to rotate.

[0024] The belt speed increaser 3 is connected to the transmission shaft system 4 via a connector. The test wheel 5 is installed at the lower part of the transmission shaft system 4, so as to drive the test wheel 5 to rotate and carry out the test.

[0025] The speed sensor 6 is installed on the belt speed increaser 3. The sensor measuring head extends into the speed increaser to measure the speed on the output side of the transmission shaft system, that is, to measure the speed of the test wheel of the test piece, generate a speed pulse signal of the test piece, and send the signal to the first set of input ports of the PLC pulse acquisition module 9.

[0026] The pulse distribution board 8 is used to receive the drive motor speed signal from the motor encoder 7 and divide this drive motor speed signal into two identical drive motor speed signals. One set is sent to the second input port of the PLC pulse acquisition module 9, and the other set is sent to the drive frequency converter 11.

[0027] The PLC CPU module 10 calculates and compares the two sets of pulse signals acquired by the PLC pulse acquisition module 9, specifically comparing the test wheel speed signal with the drive motor speed signal multiplied by the transmission ratio. The PLC CPU module 10 calculates the measured speed of each of the two speed signals based on the number of pulses per unit time of the feedback motor speed signal; that is, the number of pulses per minute divided by the number of pulses per revolution equals the speed. The PLC CPU module 10 compares the two speed signals and determines whether slippage occurs based on the difference. Based on the real-time comparison results, when the difference is within the normal range of 20 rpm, the PLC CPU module 10 issues a normal operation command to the drive inverter 11; when the difference is greater than the normal range, it issues a protective stop command to the drive inverter 11 to protect the test wheel safety.

[0028] This invention uses two sets of speed signals, both sent to the same PLC pulse acquisition module, ensuring the synchronization of the two sets of speed signals used for comparison. This avoids the speed difference caused by communication time lag between the given and actual speeds, which could lead to misjudgments of slippage. It also overcomes the shortcomings of current turbine engine cyclic fatigue testing techniques for judging belt slippage during acceleration and deceleration.

[0029] When belt slippage occurs, the rotational speed of the test piece will change significantly. At this time, there will be a significant difference between the test wheel speed signal and the drive motor speed signal multiplied by the transmission ratio. Therefore, this invention can make an accurate judgment when belt slippage occurs in the belt drive of the vertical high-speed test bench, and feed back the slippage alarm signal to the system to perform protective shutdown, avoid damage to the test piece, and better complete the cyclic fatigue test.

[0030] This invention has a simple composition, requiring only the addition of a pulse distribution board to the existing system to send the drive motor speed signal to the PLC pulse acquisition module. It is low in cost and easy to operate.

[0031] Although embodiments and drawings of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A device for real-time determination of belt slip during a turbo-engine cyclic fatigue test ramp-up procedure, characterized by: It includes driving motor (1), high speed belt (2), belt speed increasing box (3), transmission shaft system (4), test wheel disc (5), rotating speed sensor (6), motor encoder (7), pulse distribution board (8), PLC pulse acquisition module (9), PLC CPU module (10), driving frequency converter (11) and vacuum test cabin (12). The output shaft end of the driving motor (1) is connected with the input shaft end of the belt speed increasing box (3) through the high speed belt, the lower end of the belt speed increasing box (3) is connected with the transmission shaft system (4) through a connecting piece, the lower end of the transmission shaft system (4) is installed with the test wheel disc (5), and the test wheel disc (5) is placed in the vacuum test cabin (12). The rotating speed sensor (6) is installed on the belt speed increasing box (3) and measures the rotating speed of the test wheel disc (5) on the output side of the transmission shaft system (4) and transmits the test wheel disc (5) rotating speed signal to the first input end of the PLC pulse acquisition module (9). The non-output shaft end of the driving motor (1) is installed with the motor encoder (7), the motor encoder (7) acquires the rotating speed of the driving motor (1) and transmits the acquired rotating speed signal to the pulse distribution board (8), the pulse distribution board (8) divides the driving motor rotating speed signal into two groups of same rotating speed signals and transmits them to the second input end of the PLC pulse acquisition module (9) and the driving frequency converter (11) respectively, the PLC CPU module (10) calculates the two groups of rotating speed signals acquired by the PLC pulse acquisition module (9), if the difference is within 20 rpm, it sends normal operation instruction to the driving frequency converter (11); if the difference is greater than 20 rpm, it sends protective parking instruction to the driving frequency converter (11), and the driving frequency converter (11) controls the driving motor (1) to adjust the corresponding working state.

2. The apparatus for real-time determination of belt slip during a turbo engine cyclic fatigue test ramp process of claim 1, wherein: The rotating speed sensor (6) is installed at the middle position of the belt speed increasing box (3) near the transmission shaft system (4).

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