JPS6175968U - - Google Patents

Description

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. Fig. 1 is a functional block diagram of the invention, Fig. 2 is a diagram showing the relationship between detected torque and time when loosening a screw member, and Fig. 3 is a nut runner. FIG. 4 is a block diagram of the control device and related devices, and is a flowchart of the control performed by the nut runner control device. 1...nut runner, 1b...torque detector,
2... Nut runner control device, _T0 ... Allowable loosening time, _t0 ... Reference time, _T1 ... First set torque, _T2 ... Second set torque, 4... First torque setting device, 5 ... second torque setting device, 10 ... control circuit, 13 ... clock circuit.

Claims (1)

[Scope of Claim for Utility Model Registration] In a control device for a nut runner that loosens a temporarily tightened screw member, there is a torque detector installed in the nut runner, and an increasing torque in a loosening torque characteristic consisting of an ascending torque and a descending torque generated during loosening. the first of
a first torque setting means for setting a torque value; a second torque setting means for setting a second torque value lower than the first torque value of the descending torque in the loosening torque characteristic; and a second torque from the first torque value. a time measuring means for measuring the actual time until the first torque value; and a time measuring means for storing a preset reference time from the first torque value to the second torque value, and actuating the time measuring means after receiving the detection signal of the first torque value. A control means for outputting a signal, receiving an output signal corresponding to the actual time until the detection of the second torque value from the time measuring means, comparing it with a reference time, and outputting a signal indicating whether it is good or bad. Nut runner control device.