Engine shaft fatigue test device

By introducing a heating box and a sealed tube structure into the engine shaft fatigue test device, the problem that the existing test device cannot simulate high temperatures is solved, the engine shaft fatigue test in a high temperature environment is realized, and the accuracy and safety of the test are improved.

CN223449496UActive Publication Date: 2025-10-17SHENYANG PUHUA TECH DEV CO LTD
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Patent Information

Application Number
CN202521834098.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-08-27
Publication Date
2025-10-17
Estimated Expiration
2035-08-27

AI Technical Summary

Technical Problem

The existing crankshaft fatigue testing equipment cannot simulate the actual high-temperature environment, resulting in optimistic test results and safety risks.

Method used

An engine shaft fatigue test device was designed. It combines a heating box to simulate a high-temperature environment, heats up through fuel combustion and is monitored and controlled by thermocouples to achieve load rotation testing. The device is adapted to sealing tubes of different diameters of engine shafts to reduce heat loss.

Benefits of technology

By simulating the actual high-temperature working environment of the machine shaft, the test results are more in line with the real working conditions, which improves the accuracy and safety of the test, as well as the adaptability and assembly convenience.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of crankshaft equipment, and discloses an engine shaft fatigue test device, which comprises a base, a main controller fixedly connected to the top of the base, a motor fixedly connected to the base at the rear side of the main controller, and a motor electrically connected with the main controller through a cable. And bearing seats are fixedly connected to the positions, close to the motor and the speed reducer, of the top of the base correspondingly, and transmission shafts are rotationally connected into the bearing seats. The high-temperature environment of the actual work of the crankshaft can be simulated, the test is more suitable for the real working condition through the fuel combustion temperature rise of the heating box and the thermocouple monitoring temperature control, the motor, the speed reducer and the transmission shaft are matched, the load rotation test is realized, the force and temperature influence is considered, and meanwhile, the replaceable sealing pipe is arranged in the end cover and can adapt to the crankshafts with different diameters; and the sealing pipe is sealed by virtue of airflow, so that the heat loss is reduced while the assembling convenience of the crankshaft is improved.
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Description

TECHNICAL FIELD

[0001] The utility model relates to machine shaft equipment technical field, especially a kind of engine shaft fatigue test device. BACKGROUND

[0002] The machine shaft of aero-engine is core rotating component, divide high pressure, medium pressure, low pressure axle etc., be made of high-strength alloy or composite material, it connects compressor, turbine and other key components, transmit huge torque and power, while withstand high temperature, high pressure and complex stress;

[0003] Machine shaft needs to be tested before leaving factory, can simulate long-term stress, assess its fatigue resistance, find hidden trouble in advance, ensure that fatigue failure does not cause failure in use, guarantee equipment safe operation, and existing machine shaft fatigue degree test load rotation test, can simulate the torque, bending moment etc. force that machine shaft is subjected to when working, by letting machine shaft rotate under load, observe its fatigue under stress repeated action, this can quickly find the weak point of machine shaft material or structure, but this test does not simulate actual high temperature environment, in actual operation, high temperature can make machine shaft material performance weaken, such as strength decreases, toughness reduces, fatigue life will be shortened, and the fatigue limit measured under normal temperature may be higher than actual, leading to that qualified machine shaft appears fatigue fracture in advance in actual use, there is security risk. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of engine shaft fatigue test device, can effectively solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the utility model is as follows:

[0006] An engine shaft fatigue test device, comprising a base, the base top is fixedly connected with a main control unit, the base on the rear side position of the main control unit is also fixedly connected with a motor, the motor is electrically connected with the main control unit through cable, the base top is fixedly connected with a speed reducer on the side away from the motor, the base top is fixedly connected with a bearing seat on the position close to the motor and the speed reducer respectively, the bearing seat is rotatably connected with a transmission shaft, the base top is fixedly connected with a heating box on the position close to the bearing seat, the heating box includes a protective shell, the protective shell is fixedly connected with a refractory layer, the protective shell both sides are fixedly connected with an end cover, the end cover is provided with fuel shunt passage and compressed gas shunt passage, the end cover is provided with a plurality of material injection channels close to the fuel shunt passage position and communicated with fuel shunt passage cavity, the end cover is provided with a plurality of gas outlets close to the compressed gas shunt passage position, and the gas outlets are respectively communicated with compressed gas shunt passage and corresponding fuel shunt passage cavity at both ends, and the end cover is fixedly connected with a sealing tube.

[0007] As a further preferred embodiment of the present invention, one end of one of the transmission shafts is fixedly connected to the output end of the motor, and one end of the other transmission shaft is fixedly connected to the input end of the reducer. The two transmission shafts are fixedly connected to clamps at opposite ends. The two transmission shafts can be connected in series with the motor and the reducer through the cooperation of the clamps, thereby achieving load rotation by applying a certain torque to the transmission shaft.

[0008] As a further preferred embodiment of the present invention, an exhaust pipe is fixedly connected to the top of the protective shell, and the exhaust pipe is communicated with the inner cavity of the refractory layer. The protective shells located on both sides of the exhaust pipe are also fixedly connected to mounting bases, and thermocouples are fixedly connected to the mounting bases. The thermocouples are electrically connected to the main controller. By setting up two thermocouples, the temperature in the heating box can be monitored in zones to control the temperature in the heating box to remain within an appropriate test range.

[0009] As a further preferred embodiment of the present invention, one side of the end cover is fixedly connected to a first connecting flange, and the first connecting flange is fixedly connected to one side of the protective shell by bolts, and the outer side of the end cover is fixedly connected to a fuel pipe connecting end, and the fuel pipe connecting end is connected to the fuel diversion channel cavity, and the fuel pipe connecting end is connected to an external oil pump through an oil pipe, and the outer side of the end cover is also fixedly connected to a plurality of air pipe connecting ends, and the air pipe connecting end is connected to the compressed gas diversion channel cavity, and the air pipe connecting end is connected to an external air compression device through an air pipe. The opening of the fuel diversion channel and the compressed gas diversion channel can divert external fuel and high-pressure gas to multiple spray channels and air outlet channels, thereby improving the combustion efficiency of the fuel, and allowing the flame to penetrate into the middle of the heating box, improving the temperature uniformity in the heating box, thereby realizing fatigue testing of the machine shaft under high temperature environment.

[0010] As a further preferred solution of the present invention, a diversion groove is circumferentially provided on the inner side of the end cover, and the diversion groove is connected to the compressed gas diversion channel cavity.

[0011] As a further preferred embodiment of the present invention, an air intake groove is circumferentially opened in the sealing tube, a plurality of connecting blocks are fixedly connected in the air intake groove, a guide ramp is fixedly connected to the inner side of the sealing tube near the air intake groove, a second connecting flange is fixedly connected to one side of the sealing tube, the sealing tube and the exhaust pipe are inserted into the end cover and fixed by bolts, and the air intake groove is connected to the diversion groove cavity. When testing machine shafts of different diameters, sealing tubes of different inner diameters can be replaced, and the high-pressure gas in the compressed gas diversion channel enters the air intake groove through the diversion groove, and is guided to the machine shaft by the guide ramp, so that the sealing between the sealing tube and the machine shaft can be achieved by a high-velocity airflow, thereby ensuring the rotation of the machine shaft while preventing heat from being lost from the gap between the sealing tube and the machine shaft.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] In this utility model, the high-temperature environment in which the machine shaft actually works can be simulated. By heating the fuel in the heating box by burning and heating it up, and cooperating with thermocouples to monitor and control the temperature, the test can be more in line with the actual working conditions. The motor, reducer and drive shaft cooperate to realize the load rotation test, taking into account the influence of force and temperature. At the same time, a replaceable sealing tube is provided in the end cover, which can adapt to machine shafts of different diameters, and the sealing tube is sealed with the help of airflow, which improves the convenience of machine shaft assembly while reducing heat loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the heating box structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the disassembled structure of the heating box of the present utility model;

[0017] Figure 4 This is a cross-sectional view of the protective shell and the refractory layer of the present invention;

[0018] Figure 5 This is a schematic diagram of the disassembled structure of the end cover and the sealing tube of the utility model;

[0019] Figure 6 This is a cross-sectional view of the end cover of the present utility model;

[0020] Figure 7 This is a cross-sectional view of the sealing tube of the present utility model;

[0021] Figure 8 for Figure 7 Enlarged view of point A in the middle.

[0022] In the figure: 1. Base; 2. Main controller; 3. Motor; 4. Bearing seat; 5. Drive shaft; 6. Clamp; 7. Reducer; 8. Heating box; 9. Protective shell; 10. Refractory layer; 11. End cover; 12. Fuel diversion channel; 13. Compressed gas diversion channel; 14. Air outlet channel; 15. Spray channel; 16. Sealing tube; 17. Exhaust pipe; 18. Mounting seat; 19. Thermocouple; 20. First connecting flange; 21. Air pipe connecting end; 22. Fuel pipe connecting end; 23. Diversion flow groove; 24. Air inlet groove; 25. Connecting block; 26. Guide ramp; 27. Second connecting flange. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0024] like Figures 1-8 As shown, the present invention provides an engine shaft fatigue test device, including a base 1, a main controller 2 is fixedly connected to the top of the base 1, a motor 3 is also fixedly connected to the base 1 at the rear side of the main controller 2, the motor 3 is electrically connected to the main controller 2 through a cable, a reducer 7 is fixedly connected to the side of the top of the base 1 away from the motor 3, a bearing seat 4 is fixedly connected to the top of the base 1 near the motor 3 and the reducer 7, a transmission shaft 5 is rotatably connected to the bearing seat 4, a heating box 8 is fixedly connected to the top of the base 1 near the bearing seat 4, and the heating box 8 includes a protective shell 9. A refractory layer 10 is fixedly connected inside the protective shell 9, and end covers 11 are fixedly connected on both sides of the protective shell 9. A fuel diversion channel 12 and a compressed gas diversion channel 13 are provided in the end cover 11. A plurality of injection channels 15 are provided in the end cover 11 near the fuel diversion channel 12 and are connected to the fuel diversion channel 12 cavity. A plurality of air outlet channels 14 are provided in the end cover 11 near the compressed gas diversion channel 13, and both ends of the air outlet channels 14 are respectively connected to the compressed gas diversion channel 13 and the corresponding fuel diversion channel 12 cavity. A sealing tube 16 is fixedly connected inside the end cover 11.

[0025] like Figure 1 As shown, one end of one transmission shaft 5 is fixedly connected to the output end of the motor 3, and one end of the other transmission shaft 5 is fixedly connected to the input end of the reducer 7. The two transmission shafts 5 are fixedly connected to the clamps 6 at the opposite ends. The two transmission shafts 5 can be used in conjunction with the clamps 6 to connect the shaft to be tested in series with the motor 3 and the reducer 7, thereby applying a certain torque to the transmission shaft 5 to rotate under load.

[0026] like Figures 2-8As shown, the protective shell 9 top fixedly connected with exhaust pipe 17, exhaust pipe 17 with refractory layer 10 cavity communication, located on both sides of the protective shell 9 fixedly connected with mounting seat 18, mounting seat 18 fixedly connected with thermocouple 19, thermocouple 19 and main control unit 2 electrically connected, through two thermocouple 19 setting, can be partitioned monitoring the temperature in the heating box 8, to control the temperature in the heating box 8 to keep in the appropriate test range, one side of the end cover 11 fixedly connected with the first connecting flange 20, the first connecting flange 20 is fixedly connected with one side of the protective shell 9 through bolt, the outer side of the end cover 11 fixedly connected with fuel pipe connecting end 22, fuel pipe connecting end 22 with fuel shunt passage 12 cavity communication, and fuel pipe connecting end 22 through the oil pipe and external oil pump connection, the outer side of the end cover 11 is also fixedly connected with a plurality of air pipe connecting end 21, air pipe connecting end 21 with compressed gas shunt passage 13 cavity communication, and air pipe connecting end 21 through the air pipe and external air compression equipment connection, fuel shunt passage 12 and compressed gas shunt passage 13, can make the external fuel and high pressure gas shunt to a plurality of material injection channel 15 and gas outlet channel 14, so as to improve the combustion efficiency of fuel, and make the flame can be deep into the heating box 8 in the middle part, improve the uniformity of temperature in the heating box 8, so as to realize the fatigue test of the shaft in high temperature environment, the inner side of the end cover 11 is circumferentially provided with shunt groove 23, shunt groove 23 with compressed gas shunt passage 13 cavity communication, the inner side of the sealing tube 16 is circumferentially provided with air inlet channel 24, a plurality of connecting blocks 25 are fixedly connected in the air inlet channel 24, the inner side of the sealing tube 16 is fixedly connected with the flow guide inclined plate 26 close to the air inlet channel 24, the second connecting flange 27 is fixedly connected on one side of the sealing tube 16, the sealing tube 16 and exhaust pipe 17 are inserted in the end cover 11 and fixed by bolt, and the air inlet channel 24 and shunt groove 23 cavity communication, when testing the shaft with different diameter, the sealing tube 16 with different inner diameter can be replaced, and the high pressure gas in the compressed gas shunt passage 13 enters the air inlet channel 24 through the shunt groove 23, and is guided by the flow guide inclined plate 26 to blow to the shaft, that is, the sealing between the sealing tube 16 and the shaft can be realized by high flow rate airflow, which can ensure the rotation of the shaft while preventing heat loss from the gap between the sealing tube 16 and the shaft.

[0027] It needs to be explained that the utility model discloses an engine shaft fatigue test device, when using, first, the axle is inserted in the heating box 8, then, two bearing seats 4 are moved to the heating box 8 one side respectively, and through the shaft coupling, one end of two transmission shafts 5 is fixedly connected with the output end of motor 3 and the input end of speed reducer 7 respectively, and the fixture 6 of one end of transmission shaft 5 is clamped and fixed in one end of axle, so that the axle is suspended in the heating box 8 through the cooperation of two fixtures 6, then, the master control unit 2 starts motor 3, motor 3 drives transmission shaft 5 to rotate, transmission shaft 5 rotates together with the axle, simultaneously, speed reducer 7 applies load to transmission shaft 5, so that the axle is subjected to torque effect in the rotating process, and the stress condition in actual work is simulated.

[0028] The external fuel pump transports fuel to the fuel shunt passage 12 of the end cover 11 through the fuel pipe connection end 22, the external air compression device transports high-pressure gas to the compressed gas shunt passage 13 through the air pipe connection end 21, the fuel is sprayed out through the spraying passage 15, the igniter on one side of the end cover 11 starts ignition, the high-pressure gas enters the fuel shunt passage 12 through the gas outlet passage 14, so that the fuel is fully burned, the inside of the heating box 8 is heated, and the high-pressure gas in the compressed gas shunt passage 13 enters the air inlet passage 24 of the sealing pipe 16 through the shunt groove 23, and then is guided to blow to the axle through the guide inclined plate 26, so that heat loss from the gap is prevented, and the rotation of the axle is not affected. During the heating process, the thermocouple 19 on the mounting seat 18 monitors the temperature in the heating box 8 and transmits data to the master control unit 2, the master control unit 2 adjusts the supply amount of fuel and gas according to the data to maintain the set temperature, simulates the high-temperature environment of the axle in actual work, and under the combined action of high temperature and load rotation, fatigue damage is generated in the material due to repeated stress. With the increase of test time, the damage accumulates, when reaching the limit, the axle will appear cracks or even breakage, and by observing the time, position and degree of damage of the axle, the anti-fatigue performance can be evaluated.

[0029] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principle of the utility model, and various changes and improvements can be made to the utility model without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. An engine shaft fatigue test device, characterized by: The invention comprises a base (1), wherein the top of the base (1) is fixedly connected to a main controller (2), and a motor (3) is also fixedly connected to the base (1) located at the rear side of the main controller (2), and the motor (3) is electrically connected to the main controller (2) through a cable. A reducer (7) is fixedly connected to the side of the top of the base (1) away from the motor (3), and a bearing seat (4) is fixedly connected to the top of the base (1) near the motor (3) and the reducer (7), respectively. A transmission shaft (5) is rotatably connected in the bearing seat (4), and a heating box (8) is fixedly connected to the top of the base (1) near the bearing seat (4), and the heating box (8) includes a protective shell (9), and the protective shell (9) has a plurality of inner portions. A fire-resistant layer (10) is fixedly connected, and end covers (11) are fixedly connected to both sides of the protective shell (9), a fuel diversion channel (12) and a compressed gas diversion channel (13) are provided in the end cover (11), a plurality of injection channels (15) are provided in the end cover (11) near the fuel diversion channel (12) and are connected to the fuel diversion channel (12) cavity, a plurality of air outlet channels (14) are provided in the end cover (11) near the compressed gas diversion channel (13), and both ends of the air outlet channels (14) are respectively connected to the compressed gas diversion channel (13) and the corresponding fuel diversion channel (12) cavity, and a sealing tube (16) is fixedly connected in the end cover (11).

2. The engine shaft fatigue testing device according to claim 1, characterized in that: One end of one of the transmission shafts (5) is fixedly connected to the output end of the motor (3), and one end of the other transmission shaft (5) is fixedly connected to the input end of the reducer (7). The two transmission shafts (5) are fixedly connected to the clamps (6) at their opposite ends.

3. The engine shaft fatigue testing device according to claim 1, characterized in that: An exhaust pipe (17) is fixedly connected to the top of the protective shell (9), and the exhaust pipe (17) is communicated with the inner cavity of the fire-resistant layer (10). The protective shells (9) located on both sides of the exhaust pipe (17) are also fixedly connected to mounting seats (18), and a thermocouple (19) is fixedly connected to the mounting seat (18), and the thermocouple (19) is electrically connected to the main controller (2).

4. The engine shaft fatigue testing device according to claim 1, characterized in that: One side of the end cover (11) is fixedly connected to a first connecting flange (20), and the first connecting flange (20) is fixedly connected to one side of the protective shell (9) through bolts. The outer side of the end cover (11) is fixedly connected to a fuel pipe connecting end (22), and the fuel pipe connecting end (22) is communicated with the cavity of the fuel diversion channel (12), and the fuel pipe connecting end (22) is connected to an external oil pump through an oil pipe. The outer side of the end cover (11) is also fixedly connected to a plurality of air pipe connecting ends (21), and the air pipe connecting ends (21) are communicated with the cavity of the compressed gas diversion channel (13), and the air pipe connecting ends (21) are connected to an external air compression device through an air pipe.

5. The engine shaft fatigue testing device according to claim 1, characterized in that: A diversion groove (23) is circumferentially provided on the inner side of the end cover (11), and the diversion groove (23) is in communication with the cavity of the compressed gas diversion channel (13).

6. The engine shaft fatigue testing device according to claim 5, characterized in that: An air intake groove (24) is circumferentially opened in the sealing tube (16), a plurality of connecting blocks (25) are fixedly connected in the air intake groove (24), a guide inclined plate (26) is fixedly connected to the inner side of the sealing tube (16) near the air intake groove (24), a second connecting flange (27) is fixedly connected to one side of the sealing tube (16), the sealing tube (16) and the exhaust pipe (17) are inserted into the end cover (11) and fixed by bolts, and the air intake groove (24) is communicated with the cavity of the diversion groove (23).