CN212407269U - High-strength bolt connecting pair for connecting large-scale multilayer structure of wind generating set - Google Patents

Abstract

The utility model discloses a high-strength bolt connecting pair for connecting a large-scale multilayer structure of a wind generating set, which comprises a high-strength stud, an elastic telescopic nut, a high-strength gasket and a pretensioner, the high-strength stud extends into the pre-aligned mounting through hole of the large-scale multilayer structure from top to bottom, the elastic telescopic nut is screwed into the exposed part at the bottom of the high-strength stud from the lower part of the high-strength stud, the high-strength gasket is sleeved with the high-strength stud above the high-strength stud, the pretensioner consists of a high-strength nut and a plurality of jacking bolts, the high-strength nut is screwed in the high-strength stud from the upper part of the high-strength stud, a plurality of jacking bolts are sequentially screwed in the high-strength nut, the diameter of the inscribed circle of the head of each pushing bolt is the same as that of the screw, and a fool-proof structure is processed on the peripheral surface between the head of each pushing bolt and the screw. The utility model has the advantages of simple structure, simple operation are prevented slow-witted simply, positioning accuracy is high, the pretightning force is even.

Description

High-strength bolt connecting pair for connecting large-scale multilayer structure of wind generating set

Technical Field

The utility model relates to a technical field of the large-scale multilayer structure of wind generating set connects and pretension especially indicates that a high strength bolted connection for connecting the large-scale multilayer structure of wind generating set is vice.

Background

The general structural connection of the wind generating set is realized by adopting a bolt connection pair, and then the wind generating set is pre-tightened by applying torque or stretching. Along with the implementation of a large-wind turbine strategy, the related structural types of the wind turbine generator tend to be large-scale and multi-layered, under the conventional conditions, the large-scale multi-layer structure has higher difficulty in installation, maintenance and repair by adopting a large-scale bolt connecting piece, and the large-scale multi-layer structure needs higher friction force to ensure that the large-scale multi-layer structure does not displace mutually. If the conventional large-scale bolt connecting piece is adopted for connection and pre-tightening, the conditions of large specification, more quantity, limited fastening space, uneven pre-tightening force and the like of the required bolt can occur, and the connection reliability requirement of a large-scale multilayer structure can not be met.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a high strength bolted connection pair for connecting the large-scale multilayer structure of wind generating set, have simple structure, the operation is simply prevented slow-witted, positioning accuracy is high, pretightning force advantage such as even.

In order to achieve the above object, the present invention provides a technical solution: a high-strength bolt connecting pair for connecting a large-scale multilayer structure of a wind generating set comprises a high-strength stud, an elastic telescopic nut, a high-strength gasket and a pretensioner, wherein the high-strength stud extends into a pre-aligned mounting through hole of the large-scale multilayer structure from top to bottom, the bottom of the high-strength stud is exposed and used for connecting the elastic telescopic nut, the elastic telescopic nut is screwed into the exposed part at the bottom of the high-strength stud from the lower part of the high-strength stud until the top surface of the elastic telescopic nut is attached to a lower flange surface of a screw hole of a bottom layer structural member of the large-scale multilayer structure, the high-strength gasket is sleeved into the high-strength stud from the upper part of the high-strength stud to enable the bottom surface of the high-strength stud to be attached to an upper flange surface of the through hole of the top layer structural member of the large-scale multilayer structure, the pretensioner comprises the high-strength, the plurality of pushing bolts are sequentially screwed into the high-strength nut and are circumferentially arrayed on the high-strength nut, wherein the diameter of an inscribed circle of the head of each pushing bolt is the same as that of the screw rod, a foolproof structure is processed on the outer peripheral surface between the head of each pushing bolt and the screw rod, the part of each pushing bolt, which is screwed out of the high-strength nut, keeps a proper length through the foolproof structure and is abutted to the high-strength gasket, the high-strength nut is rotated by 90 degrees, and the reliable connection of a large-scale multilayer structure is realized.

Further, the fool-proof structure is an annular fixing bulge formed on the outer peripheral surface of the pushing bolt and integrally formed with the pushing bolt, and when the pushing bolt is screwed into the high-strength nut, the bottom surface of the fixing bulge is attached to the top surface of the high-strength nut.

Compared with the prior art, the utility model, have following advantage and beneficial effect:

the utility model discloses a high strength bolted connection is vice, have simple structure, the operation is simply prevented slow-witted, the controllable, the pretightning force of on-the-spot installation positioning accuracy advantage such as even, operating personnel uses conventional hand tool can screw up and unscrew the operation to large-scale multilayer structure's connection, practices thrift operating time, improves operating efficiency, avoids reaching the problem that the installation degree of difficulty is big because of operating space is limited to specialized tool's dependence.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a partial cross-sectional view of the present invention.

Fig. 3 is a top view of the pretensioner of the present invention.

Fig. 4 is a schematic structural view of the jack bolt of the present invention.

Detailed Description

The present invention will be further described with reference to the following specific embodiments.

As shown in fig. 1 to 4, the high-strength bolt connection pair for connecting a large-scale multilayer structure of a wind generating set according to the present embodiment includes a high-strength stud 1, an elastic telescopic nut 2, a high-strength gasket 3 and a pretensioner; the high-strength stud 1 is processed by using a 42CrMoA material, the strength grade is 8.8 grade, the tensile strength is more than or equal to 830N/mm2, the yield strength is more than or equal to 640N/mm2, and the impact energy (AKV 2): the high-strength stud 1 extends into a pre-aligned mounting through hole of a large-scale multilayer structure from top to bottom, and the bottom of the high-strength stud is exposed for connecting an elastic telescopic nut 2; the elastic telescopic nut 2 is screwed into the exposed part at the bottom of the high-strength stud 1 from the lower part of the high-strength stud 1 until the top surface of the elastic telescopic nut is attached to the lower flange surface of the screw hole of the large-scale multi-layer structure bottom structural member 7; the high-strength gasket 3 is sleeved in the high-strength stud 1 from the upper part of the high-strength stud 1, so that the bottom surface of the high-strength gasket is attached to the flange surface on the through hole of the large-scale multi-layer structure top-layer structural member 6; the pretensioner adopts hydraulic pressurization and consists of a high-strength nut 4 and a plurality of jacking bolts 5, the high-strength nut 4 is formed by screwing the high-strength stud 1 above the high-strength stud 1 to ensure that the bottom surface of the high-strength stud is attached to the top surface of the high-strength gasket 3, the jacking bolts 5 are sequentially screwed into the high-strength nut 4, namely the jacking bolts 5 are circumferentially arrayed on the high-strength nut 4, wherein the diameter of an inscribed circle of the head of each jacking bolt 5 is the same as the diameter of the screw rod, a foolproof structure is processed on the outer peripheral surface between the head of each jacking bolt 5 and the screw rod, namely, an annular fixing bulge 51 which is integrally formed with the jacking bolt 5 is processed on the outer peripheral surface of each jacking bolt 5, the bottom surface of each fixing bulge 51 is attached to the top surface of the high-strength nut 4, the part of each jacking bolt 5, which is screwed out of the high-strength nut 4, is kept at, further rotating the high-strength nut 4 by 90 degrees, applying the same design torque to the jacking bolt 5 to ensure that the high-strength nut 4 obtains the expected pre-tightening force, so that the large-scale multilayer structure is accurately assembled and connected and obtains enough friction force, and finally the reliable connection of the large-scale multilayer structure is realized; the elasticity advantage of the pretensioner is introduced to the corresponding side of the connecting piece through the elastic telescopic nut 2, the bottom of the elastic telescopic nut 2 is outwards tensioned, meanwhile, the top of the elastic telescopic nut 2 is inwards contracted, the pre-tightening force of the pushing bolt 5 is distributed to a plurality of threads, the elasticity is improved, the stress concentration is prevented, and the pre-tightening force can be obtained without directly applying torque.

Through the design of this embodiment ejector bolt 5, make ejector bolt 5 screw out the part of high strength nut 4 and keep suitable length, and contradict to high strength gasket 3 on, effectively avoided using current ejector bolt, it interferes with the ejector bolt next door when moment value is beaten through the extension sleeve, the problem that can't embolia, and use current ejector bolt to twist and can not push up the bottom, can only rely on the accurate pressure boost of preloader to foresee, no coarse tuning precision, make the installation location size degree of difficulty increase, be unfavorable for the problem of on-the-spot installation.

The above-mentioned embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that all the changes made according to the shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims (2)

1. A high strength bolted connection is vice for connecting large-scale multilayer structure of wind generating set, its characterized in that: the high-strength stud bolt is inserted into a prealigned mounting through hole of a large-scale multilayer structure from top to bottom, the bottom of the high-strength stud bolt is exposed and used for being connected with the elastic telescopic nut, the elastic telescopic nut is screwed into the exposed part at the bottom of the high-strength stud bolt from the lower part of the high-strength stud bolt until the top surface of the elastic telescopic nut is jointed with a lower flange surface of a screw hole of a bottom structure of the large-scale multilayer structure, the high-strength stud bolt is sleeved into the high-strength spacer from the upper part of the high-strength stud bolt, the bottom surface of the high-strength spacer bolt is jointed with an upper flange surface of the through hole of a top structure of the large-scale multilayer structure, the preloader consists of the high-strength nut and a plurality of pushing bolts, the high-strength stud bolt is screwed into the upper part of the high-strength stud bolt, the bottom surface, the plurality of pushing bolts are circumferentially arrayed on the high-strength nut, wherein the diameter of an inscribed circle of the head of each pushing bolt is the same as that of the screw rod, a foolproof structure is processed on the outer peripheral surface between the head of each pushing bolt and the screw rod, the part of each pushing bolt, which is screwed out of the high-strength nut, keeps a proper length through the foolproof structure and is abutted against the high-strength gasket, and then the high-strength nut is rotated by 90 degrees, so that the reliable connection of a large-scale multilayer structure is realized.

2. The high-strength bolt connection pair for connecting the large-scale multilayer structure of the wind generating set according to claim 1, characterized in that: the fool-proof structure is an annular fixing bulge which is formed on the outer peripheral surface of the pushing bolt and is integrally formed with the pushing bolt, and when the pushing bolt is screwed into the high-strength nut, the bottom surface of the fixing bulge is attached to the top surface of the high-strength nut.

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