An adjustable bolt pretensioning device and method for fastening bolts

Abstract

The invention provides an adjustable bolt pre-tightening device and a method for fastening a bolt. The device comprises a fixing cover which is arranged at the top end of the device and is used for allowing a torsion spanner to be inserted thereinto, a supporting seat used for supporting the whole device after being connected with the fixing cover, a cam gear ring which is arranged on the periphery of the supporting seat in a sleeving manner and is adjusted in a rotating mode in the axial direction of the supporting seat to be suitable for the hole diameter of the bolt, a sliding block which is tightly attached to the inner wall of the cam gear ring, used for clamping the bolt and arranged on the supporting seat, and a locking block for preventing the cam gear ring from rotating. The adjustable bolt pre-tightening device is suitable for head bolts of various specifications, so that the problem that a bolt pre-tightening sleeve is single in specification is solved; the adjustable bolt pre-tightening device is firm in structure, and is not prone to damage when large torque is used; and the bolt is clamped tightly, so that a harmful gap between the pre-tightening device and the bolt is reduced, and the service life of the pre-tightening device is prolonged.

Description

technical field [0001] The invention relates to the field of manufacturing, in particular to the installation and removal of bolts and nuts by a torque wrench in equipment manufacturing. Background technique [0002] In the field of machinery manufacturing, threaded connections are widely and frequently used. As a common tool for installing and dismounting hexagon head bolts, torque wrenches have the advantages of large torque, high precision, and high torsion efficiency. The torque wrench pre-tightens the bolt through the bolt sleeve. One end of the sleeve is a square hole connected with the torque wrench, and the other end is a hexagonal hole matching the hexagonal head of the bolt. [0003] However, the bolt sleeve is a forged part, and each sleeve can only be used for one specification of hexagon head bolts, and the specifications of the bolts are various according to the product design requirements, so a large number of bolt sleeves of different specifications need to b...

AI Technical Summary

Problems solved by technology

[0003] However, the bolt sleeve is a forged part, and each sleeve can only be used for one specification of hexagon head bolts, and the specifications of the bolts are various according to the product design requirements, so a large number of bolt sleeves of different specifications need to be equipped in the production and manufacturing, so that It will bring the following problems: 1. The large quantity of purchases will increase the manufacturing cost; 2. Repeated replacement of bolt sleeves will consume time and affect work efficiency; 3. When encountering specifications that are difficult to match, it is necessary to re-purchase a new type of sleeve, which will delay the production schedule ; 4. Too many types and quantities are not easy to manage

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