Hydraulic threaded bolt tightening device and method of use thereof

US7062998B2 · kind B2 · utility

Inventors

• Jörg Hohmann · Meschede, DE
• Frank Hohmann · Warstein, DE

Key dates

• Filing date: Sep 11, 2002
• Grant date: Jun 20, 2006
• Expiry date: Nov 26, 2022

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B23P19/067
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A hydraulic threaded bolt tightening device (1) for tightening and loosening large bolted connections, comprising a cylinder supported on a machine part to be clamped by means of a threaded bolt and a nut (2), at least one piston which is guided thereon in a sealed manner, with a threaded bush screwed on to one end of the threaded bolt and which can be pressurized, a pressure medium supply (4) to the threaded bolt tightening device (1), an adjusting ring (6) arranged in the cylinder and connected to the nut (2) by a form fit, and a rotary drive (7) for the adjusting ring (6) with a drive connection (16) to the adjusting ring (6), a rotation angle sensor (8) on the rotary drive, a control device (9) for driving the pressure medium supply (4) to the threaded bolt tightening device (1) and the rotation of the rotary drive (7), an input device (1), and the rotation of the rotary drive (7), an input device (10) for entering the pitch of the threaded bolt, and a computer device (11) for converting the rotation angle of the nut, measured by means of the rotation angle sensor (8), into the extension of the threaded bolt effected by the threaded bolt tightening device (1).