Nut tightening device and method for narrow space in aero-engine

Abstract

The invention relates to a nut tightening device and method for a narrow space in an aero-engine, and belongs to the technical field of automatic assembly.The nut tightening device comprises a rotary table base, a rotating mechanism arranged on the rotary table base, a lifting mechanism arranged on the rotating mechanism and a front-back moving mechanism arranged on the lifting mechanism; the sleeve used for tightening the nut is fixed to the tail end of the front-back moving mechanism, and the sleeve tightens the nut to be locked through the rotating mechanism, the lifting mechanism and the front-back moving mechanism. The rotating mechanism is started to drive the lifting mechanism and the front-back moving mechanism to rotate, so that the sleeve at the rotating tail end of the front-back moving mechanism is aligned with the nut to be tightened; then the lifting mechanism is started, and the sleeve at the rotating tail end of the front-back moving mechanism is connected with the nut to be tightened; in the rotating and tightening process of the sleeve, the lifting mechanism is started to assist the sleeve in tightening the nut. The method is high in tightening precision and stable in assembly quality, it is guaranteed that the tightening force of each bolt is the same, and the tightening efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of automated assembly, and in particular relates to a device and method for tightening nuts in a narrow space inside an aero-engine. Background Art

[0002] Engine assembly is a key step in the engine manufacturing process, which has a significant impact on the overall performance and operational stability of the engine. Moreover, the assembly cost and assembly workload in the engine manufacturing process account for a large proportion, of which the cost accounts for about 40%, and the workload accounts for more than 50% of the total engine manufacturing workload. Therefore, how to shorten the assembly cycle and how to ensure the assembly quality in engine manufacturing production have become problems to be solved, and the research on flexible and automated tooling provides an effective solution to the above problems. The technical research on flexible tooling in China is mainly aimed at the assembly of engine parts and components and the assembly of the main unit and the whole of the engine, and there are many achievements in theoretical research and prototype testing.

[0003] The assembly tool used in traditional production is a pneumatic wrench, which has high efficiency, but has the problem of poor tightening accuracy. The entire tightening process is also affected by air pressure, making it difficult to ensure the quality of assembly.

[0004] With the continuous development of technology, automatic tightening technology is increasingly valued by related enterprises and industries. It has also developed greatly in recent years. The application of various servo control tools in engine assembly has also become very extensive, so as to ensure that the accuracy of data can be controlled within 3%. At the same time, the most suitable tightening scheme is selected according to the characteristics of different tightening methods to ensure high-precision and relatively stable tightening quality. In addition to ensuring the bite of tightening, automatic tightening tightening technology must also have the characteristics of compactness and high-speed operation performance, further improving the control system of tightening technology and making the anti-interference performance stronger. The control software can issue an alarm and diagnose the error when an error occurs in tightening, so as to facilitate the subsequent maintenance work. Automatic tightening uses the motor as the power source, and the tightening torque is made to meet the required force through a multi-stage reduction system. The motor is also equipped with a torque sensor to facilitate the detection and control of the continuous change of torque, providing good reference data for the tightening device.

[0005] However, the pace of engine production is constantly increasing and the production cycle is greatly shortened. When automatic tightening technology is assembled in a small space, how to ensure the accuracy of the tightening technology and the stability of the assembly quality, so as to produce high-quality products, still needs to be improved. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a nut tightening device and method for a narrow space inside an aircraft engine, which realizes the fully automatic tightening of bolts inside the engine. The operation is simple and labor is greatly liberated. Compared with manual tightening, the tightening accuracy is high and the assembly quality is stable. The tightening force of each bolt is guaranteed to be the same, thereby improving the tightening efficiency inside the engine.

[0007] A nut tightening device for a narrow space inside an aircraft engine comprises a turntable base, a rotating mechanism arranged on the turntable base, a lifting mechanism arranged on the rotating mechanism, and a forward and backward moving mechanism arranged on the lifting mechanism. A sleeve for tightening the nut is fixed at the end of the forward and backward moving mechanism, and the sleeve tightens the nut to be locked through the rotating mechanism, the lifting mechanism, and the forward and backward moving mechanism.

[0008] The rotating mechanism includes a turntable drive motor, the output end of which is connected to the turntable base through a transmission mechanism I, the output end of the turntable drive motor is fixedly connected to a turntable, and the turntable is rotatably connected to the turntable base.

[0009] The transmission mechanism I includes a turntable gear set, which includes a driving gear connected to the output end of the lifting drive motor and a driven gear tooth arranged on the outer edge of the turntable base, and the driving gear is meshed with the driven gear tooth.

[0010] The lifting mechanism includes a lifting drive motor, one end of the screw rod is connected to the output end of the lifting drive motor, and the other end is threadedly connected to the rotating table; the screw rod is connected to a turntable base plate I through a bearing, and a protective tube and a forward and backward moving mechanism are arranged at the lower end of the turntable base plate I.

[0011] A plurality of lead screws are arranged along the circumference of the rotating table.

[0012] The forward and backward moving mechanism includes a forward and backward moving motor, one end of the power input shaft is connected to the output end of the forward and backward moving motor through a transmission mechanism II and a reducer, and the other end is meshed with a rack through a moving mechanism gear fixed at the end, and a bearing seat I and a bearing seat II are arranged on the power output shaft, and the bearing seat I and the bearing seat II are fixed to the inner wall of the protective tube; the rack is fixed on the slider of the guide rail module, and the slider moves on the guide rail of the guide rail module, and the guide rail is fixed to the inner wall of the protective tube; a gear box is arranged on the rack, and a sleeve for tightening the nut is installed on the output shaft of the gear box.

[0013] The transmission mechanism II is a belt transmission mechanism, which forms a synchronous belt drive device with the front and rear moving motors. The driven pulley is fixed to the top of the power input shaft and is connected to the driving pulley fixed to the output end of the front and rear moving motors through a belt.

[0014] A torque sensor is arranged on the power input shaft.

[0015] A turntable base plate II is fixed to the outer edge of the turntable base, and a plurality of hanging earrings are fixedly mounted on the turntable base plate II for hanging the entire device.

[0016] A method for tightening nuts in a narrow space inside an aircraft engine, using the above-mentioned device for tightening nuts in a narrow space inside an aircraft engine, is specifically as follows:

[0017] The rotating mechanism is started to drive the lifting mechanism and the front-rear moving mechanism to rotate, so that the sleeve at the rotating end of the front-rear moving mechanism is aligned with the nut to be tightened; then the lifting mechanism is started to connect the sleeve at the rotating end of the front-rear moving mechanism with the nut to be tightened; during the process of rotating and tightening the sleeve, the lifting mechanism is started to assist the sleeve in tightening the nut;

[0018] During the working process of the sleeve, the torque sensor measures the torque to ensure that the maximum tightening is achieved without damaging the thread and that the force applied to each screw is the same.

[0019] The beneficial effects of the present invention are: the present invention realizes automatic tightening, automatic detection of tightening torque, automatic search for the next screw, realizes unmanned operation, saves personnel costs, and in terms of production efficiency, the production efficiency is improved by 20%. Due to the use of the torque method, the tightening accuracy is greatly improved, and each nut is evenly stressed, which improves productivity and reduces production costs while ensuring assembly accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a nut tightening device for a narrow space inside an aircraft engine provided by the present invention;

[0021] Figure 2 is a schematic diagram of the lifting device in the present invention;

[0022] Figure 3 It is a schematic diagram of the forward and backward moving device of the gear box in the present invention;

[0023] Figure 4 for Figure 3 An enlarged schematic diagram of the gear rack meshing part;

[0024] in,

[0025] 1. Turntable drive motor; 2. Turntable gear set; 3. Lifting drive motor; 4. Screw; 5. Turntable base plate I; 6. Rotating table; 7. Turntable base plate II; 8. Lifting ring; 9. Torque sensor; 10. Protective tube; 11. Forward and backward moving motor; 12. Reducer; 13. Driven pulley; 14. Power input shaft; 15. Reducer connecting plate; 16. Bearing seat I; 17. Bearing seat II; 18. Moving mechanism gear; 19. Rack; 20. Gearbox; 21. Guide rail module; 22. Turntable base. DETAILED DESCRIPTION

[0026] In order to better explain the present invention and facilitate understanding, the technical solutions and effects of the present invention are described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0027] like Figure 1-4 As shown, a nut tightening device for a narrow space inside an aircraft engine includes a turntable base 22, a rotating mechanism arranged on the turntable base 22, a lifting mechanism arranged on the rotating mechanism, and a forward and backward moving mechanism arranged on the lifting mechanism.

[0028] The rotating mechanism includes a turntable drive motor 1, the output end of which is connected to the turntable base 22 through a transmission mechanism I, and the output end of the turntable drive motor 1 is fixedly connected to a turntable 6, which is rotatably connected to the turntable base 22. When the turntable drive motor 1 is started, it rotates along the outer edge of the turntable base 22 and drives the turntable 6 and the lifting mechanism I thereon to rotate synchronously.

[0029] The transmission mechanism 1 includes a turntable gear set 2, which includes a driving gear connected to the output end of the lifting drive motor 3 and a driven gear tooth arranged on the outer edge of the turntable base 22, and the driving gear is meshed with the driven gear tooth.

[0030] A turntable base plate II 7 is fixed to the outer edge of the turntable base 22, and a plurality of hoisting rings 8 are fixedly mounted on the turntable base plate II 7 for hoisting the entire device.

[0031] The lifting mechanism includes a lifting drive motor 3, one end of a lead screw 4 is connected to the output end of the lifting drive motor 3, and the other end is threadedly connected to the rotating table 6, and the lead screw is arranged in multiple directions along the circumference of the rotating table 6. The lead screw 4 is connected to a turntable base plate 15 through a bearing, and a protective barrel 10 and a forward and backward moving mechanism are arranged at the lower end of the turntable base plate 15. The protective barrel is an integral covering part of the overhanging part, which prevents the internal components from colliding with the inner wall of the engine. The lifting drive motor 3 is started, and since the rotating table 6 is fixed, the lead screw drives the turntable base plate 15 thereon and the protective barrel 10 and the forward and backward moving mechanism on the turntable base plate 15 to move up and down synchronously through the threaded connection between the rotating table 6 and the lead screw, so as to realize lifting.

[0032] The forward and backward moving mechanism includes a forward and backward moving motor 11, one end of the power input shaft 14 is connected to the output end of the forward and backward moving motor 11 through a transmission mechanism II and a reducer 12, and the other end is meshed with a rack 19 through a moving mechanism gear 18 fixed at the end, and a bearing seat I16 and a bearing seat II 17 are arranged on the power output shaft, and the bearing seat I16 and the bearing seat II 17 are fixed to the inner wall of the protective tube 10 by screws; the rack 19 is fixed on the slider of the guide rail module 21, and the slider moves on the guide rail of the guide rail module 21; the guide rail is fixed to the inner wall of the protective tube 10 by screws to provide support for the movement of the gear box 20. The reducer 12 is fixed to the turntable base plate 1 through the reducer connecting plate 15, and the power input shaft 14 is arranged inside the protective tube 10. A gear box 20 is arranged on the rack 19, and a sleeve for tightening the nut is installed on the output shaft of the gear box 20. The forward and backward moving motor 11 is started, and the power input shaft 14 is driven to rotate through the transmission mechanism II. Due to the meshing of the moving mechanism gear 18 and the rack 19, the rack 19 and the gear box 20 thereon are driven to move synchronously along the guide rail. The gear box 20 is started, driving the sleeve to rotate, and the lifting device moves up and down to realize the tightening process of the nut.

[0033] The transmission mechanism II is a belt transmission mechanism, which forms a synchronous belt drive device with the front and rear moving motor 11. The driven pulley 13 is fixed to the top of the power input shaft 14 and is connected to the driving pulley fixed to the output end of the front and rear moving motor 11 through a belt.

[0034] The power input shaft 14 is provided with a torque sensor 9, and the tightening torque of each screw is detected by the torque sensor 9 during the tightening process to ensure that the torque meets the tightening requirement and that each screw is subjected to the same force.

[0035] The present application ensures that the sleeve can tighten each bolt through the rotating table 6 and the rotation angle. The sleeve is driven by a separate synchronous belt drive device. While the sleeve rotates, the nut is tightened through the lifting device. The torque method is used in the tightening process. The torque is measured by the torque sensor 9 to calculate the force applied to the bolt to ensure that the maximum tightening is achieved without damaging the thread.

[0036] The above-mentioned method for tightening a nut in a narrow space inside an aircraft engine adopts the above-mentioned nut sleeve in a narrow space inside an aircraft engine, and is specifically as follows:

[0037] Start the rotating mechanism to drive the lifting mechanism and the front-and-rear moving mechanism to rotate, so that the sleeve at the rotating end of the front-and-rear moving mechanism is aligned with the nut to be tightened; then start the lifting mechanism to connect the sleeve at the rotating end of the front-and-rear moving mechanism with the nut to be tightened; during the process of rotating and tightening the sleeve, the lifting mechanism is started to assist the sleeve in tightening the nut.

[0038] During the working process of the sleeve, the torque sensor 9 measures the torque to ensure that the maximum tightening is achieved without damaging the thread and that the force applied to each screw is the same.

Claims

1. A nut tightening device for a narrow space inside an aircraft engine, characterized in that: It includes a turntable base, a rotating mechanism arranged on the turntable base, a lifting mechanism arranged on the rotating mechanism, and a forward and backward moving mechanism arranged on the lifting mechanism. A sleeve used for tightening a nut is fixed at the end of the forward and backward moving mechanism. The sleeve tightens the locking nut through the rotating mechanism, the lifting mechanism, and the forward and backward moving mechanism.

2. A nut tightening device for a narrow space inside an aircraft engine according to claim 1, characterized in that: The rotating mechanism includes a turntable drive motor, the output end of which is connected to the turntable base through a transmission mechanism I, the output end of the turntable drive motor is fixedly connected to a turntable, and the turntable is rotatably connected to the turntable base.

3. A nut tightening device for a narrow space inside an aircraft engine according to claim 2, characterized in that: The transmission mechanism I includes a turntable gear set, which includes a driving gear connected to the output end of the lifting drive motor and a driven gear tooth arranged on the outer edge of the turntable base, and the driving gear is meshed with the driven gear tooth.

4. A nut tightening device for a narrow space inside an aircraft engine according to claim 2, characterized in that: The lifting mechanism includes a lifting drive motor, one end of the screw rod is connected to the output end of the lifting drive motor, and the other end is threadedly connected to the rotating table; the screw rod is connected to a turntable base plate I through a bearing, and a protective tube and a forward and backward moving mechanism are arranged at the lower end of the turntable base plate I.

5. A nut tightening device for a narrow space inside an aircraft engine according to claim 4, characterized in that: A plurality of lead screws are arranged along the circumference of the rotating table.

6. A nut tightening device for a narrow space inside an aircraft engine according to claim 4, characterized in that: The forward and backward moving mechanism includes a forward and backward moving motor, one end of the power input shaft is connected to the output end of the forward and backward moving motor through a transmission mechanism II and a reducer, and the other end is meshed with a rack through a moving mechanism gear fixed at the end, and a bearing seat I and a bearing seat II are arranged on the power output shaft, and the bearing seat I and the bearing seat II are fixed to the inner wall of the protective tube; the rack is fixed on the slider of the guide rail module, and the slider moves on the guide rail of the guide rail module, and the guide rail is fixed to the inner wall of the protective tube; a gear box is arranged on the rack, and a sleeve for tightening the nut is installed on the output shaft of the gear box.

7. A nut tightening device for a narrow space inside an aircraft engine according to claim 6, characterized in that: The transmission mechanism II is a belt transmission mechanism, which forms a synchronous belt drive device with the front and rear moving motors. The driven pulley is fixed to the top of the power input shaft and is connected to the driving pulley fixed to the output end of the front and rear moving motors through a belt.

8. A nut tightening device for a narrow space inside an aircraft engine according to claim 6, characterized in that: A torque sensor is arranged on the power input shaft.

9. A nut tightening device for a narrow space inside an aircraft engine according to claim 1, characterized in that: A turntable base plate II is fixed to the outer edge of the turntable base, and a plurality of hanging earrings are fixedly mounted on the turntable base plate II for hanging the entire device.

10. A method for tightening nuts in a narrow space inside an aircraft engine, characterized in that: The nut tightening device in a narrow space inside an aircraft engine according to any one of claims 1 to 9 is specifically as follows: The rotating mechanism is started to drive the lifting mechanism and the front-rear moving mechanism to rotate, so that the sleeve at the rotating end of the front-rear moving mechanism is aligned with the nut to be tightened; then the lifting mechanism is started to connect the sleeve at the rotating end of the front-rear moving mechanism with the nut to be tightened; during the process of rotating and tightening the sleeve, the lifting mechanism is started to assist the sleeve in tightening the nut; During the working process of the sleeve, the torque sensor measures the torque to ensure that the maximum tightening is achieved without damaging the thread and that the force applied to each screw is the same.

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