A device for tightening nuts

Abstract

The invention provides a nut tightening device which comprises a positioning rod capable of being positioned to any position in space, a nut sleeve located at the end of the positioning rod, a visualsensor located on the positioning rod and used for shooting towards the direction of the nut sleeve, an electric wrench fixed to the positioning rod and used for driving the nut sleeve to rotate, anda control system, wherein a nut can be sleeved with the nut sleeve. The control system is used for driving the positioning rod to move based on an image shot by the visual sensor to enable the nut sleeve to sleeve the nut and also used for driving the electric wrench to rotate when the nut is sleeved with the nut sleeve so as to further drive the nut sleeve to rotate, and thus the nut is screwed on a screw rod.

Description

technical field [0001] The invention relates to the field of aero-engines, in particular to a device for tightening nuts. Background technique [0002] As one of the most important production links in the engine manufacturing process, aero-engine assembly directly affects the final performance, reliability, and safety of the engine. [0003] At present, the assembly of commercial aero-engines mainly follows the traditional assembly technology and management mode, and still uses two-dimensional process design, adopts the assembly method of man + crane, and uses special tooling. Production management relies on the experience and understanding of personnel, which is easy to cause wrong assembly and leakage. Assembly and parts damage, product quality and production efficiency are subject to the ability of personnel, there are problems such as engine assembly consistency, poor stability, and low assembly efficiency. [0004] The installation of "low pressure turbine unit" and "f...

AI Technical Summary

Problems solved by technology

[0007] 1) Because the torque required for tightening is relatively large (the maximum tightening torque is up to 3000N.m), the tooling used is also relatively complicated, and it takes a long time to prepare the tooling, which affects work efficiency;

[0008] 2) When manual operation is used, due to the existence of the restoring force, there are both dynamic friction and static friction on the contact surface between the coupling nut and the low-pressure turbine shaft head, which will cause greater wear to the low-pressure turbine shaft head thread and affect product quality;

There is a certain gap in the tightening force applied by different operators, and it is difficult for the same operator to apply the force evenly, which is easily affected by human factors;

[0010] 4) Using manual methods, it is impossible to monitor the torque and torsion angle in real time

At the same time, due to space constraints, it is difficult to judge whether the locking groove of the coupling nut is aligned with the locking groove of the low-pressure turbine shaft. Whether the large nut is installed in place on the low-pressure turbine shaft can only be judged by the experience of the operator

[0011] 5) Using the manual + tooling tightening method, the success rate of one-time tightening is not high, and rework often exists

Even without rework, it often takes a long time to tighten the large nut due to the complicated assembly of special tooling and cumbersome operation steps, resulting in high production costs.

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