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Patent Searching and Data


Title:
BOLT DETACHING DEVICE
Document Type and Number:
Japanese Patent JPH11198056
Kind Code:
A
Abstract:

To automatically fasten and loosen the bolt heated by the bolt heater inserted into the center hole of a bolt without requiring operators to monitor and stand-by the bolt.

A bolt heater 9 is inserted into the bolt hole 3 of a bolt 4 for fastening flanges 1 and 2. Torque is given to the upper nut 5 to be threadedly engaged to the bolt 4 by a nut turning device 11 through a drive belt 13. The elongation value of the bolt 4 due to heat obtained by an extensometer 10, the turning angle detection signal of the nut turning device 11, the predetermined heat elongation quantity of the bolt 4 by a condition setting device 18, and the predetermined turning angle by the upper nut 5 are given to a control device 17. The control device 17 controls the power supply 16 of a bolt heater so that the bolt 4 performs predetermined elongation and the nut turning device 11 turns the upper nut 5 at a predetermined angle.


Inventors:
Kono, Takayuki
Shimamoto, Takijiro
Application Number:
JP1998000003884
Publication Date:
July 27, 1999
Filing Date:
January 12, 1998
Export Citation:
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Assignee:
MITSUBISHI HEAVY IND LTD
International Classes:
B25B23/14; B23P19/06; B25B29/02; F01D25/24; F16B31/04; (IPC1-7): B25B23/14; F16B31/04