tie rod

The tie rod is used for pre-tightening combination. The structure of the tie rod, the selection of the pre-tightening force, the arrangement of the shoulders, etc. will have a great influence on the overall dynamic characteristics of the rotor. The structure of one type of building material that often appears, at the same time, there are many building structures or materials that will be built into the tie rod type. Such as single-layer cylindrical reticulated shell, diffraction grating scoring machine, etc.

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tie the of rod is and to shoulders deformation

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Product Description

The tie rod is used for pre-tightening combination. The structure of the tie rod, the selection of the pre-tightening force, the arrangement of the shoulders, etc. will have a great influence on the overall dynamic characteristics of the rotor. The structure of one type of building material that often appears, at the same time, there are many building structures or materials that will be built into the tie rod type. Such as single-layer cylindrical reticulated shell, diffraction grating scoring machine, etc.
When static, there is a mounting gap between the gas turbine tie rod shoulder and the wheel tie rod hole. When working in a high-speed environment, the tie rod is bent and deformed by centrifugal force, and the convex shoulder is in contact with the tie rod hole. At this time, the convex shoulder is subjected to a large extrusion effect, and the convex shoulder can be regarded as a fixed hinge support. The tie rods between them are regarded as statically determinate simply supported beams. From the approximation differential equation 41 of the deflection line of the beam in classical mechanics of materials and the boundary conditions of the simply supported beam model in this paper, the maximum deflection of the tie rod between the two shoulders is obtained, and the deformation of the tie rod is proportional to the fourth power of the span Z, It is inversely proportional to the fourth power of the tie rod diameter d. The main purpose of improving the tie rod structure from the perspective of strength is to effectively reduce the tie rod deformation and tie rod stress. Since the way of increasing the diameter d of the tie rod is limited by the radial and circumferential space of the wheel disc, it is necessary to reasonably increase the number of shoulders to reduce the span Z of the tie rod shoulders, which should improve the structure of the tie rod, reduce the deformation of the tie rod and reduce the deformation of the tie rod. Optimization direction of stress.

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