Electric screwdriver and control method thereof

Electric screwdriver and control method thereof

  • CN 105,500,264 A
  • Filed: 12/31/2015
  • Published: 04/20/2016
  • Est. Priority Date: 12/31/2015
  • Status: Active Application
First Claim
Patent Images

1. an electric screw driver, there is housing, handle, in described housing, motor is installed, the front end of described housing is provided with output shaft, described output shaft is connected by transmission mechanism with described motor, the front end of described output shaft is provided with driver bit jack, the driver bit of different model can be installed in described driver bit jack, control unit is provided with in described handle, for the transmission/reception of signal sending/receiving, memory cell, charging socket, the switch that is connected is carried out by described control unit with described motor, the charging socket be connected with the batteries below described handle, batteries is provided with below described handle, by electric motor starting and stopping described in described switch control rule, be connected with extraneous power supply by described charging socket, control circuit has control unit, electronic switch, switch, memory cell, current limliting configuration switch, current limiter, current detection module, voltage detection module, motor speed sensor, it is characterized in that:

  • Described transmission mechanism comprises;

    the ring gear being arranged on described motor front end, the teeth portion of described ring gear is arranged on the inner ring place of annular, the inside of described ring gear is provided with pinion frame near one end, front of electric screw driver, by some Planetary Gear Transmissions between described ring gear and described pinion frame, described output shaft is connected with pinion frame;

    The front end of described housing is provided with adjusting ring, threaded collar is provided with in described adjusting ring, the front end face of described ring gear is the torque adjustment face that height rises and falls, the spin abutted with described torque adjustment face is provided with in described housing, described spin and latch abut against, and the front end of described latch is provided with check plate, are provided with spiral support spring between described check plate and described threaded collar, activating described threaded collar by rotating described adjusting ring, making described helical spring be compressed or extend;

    The rear end of described output shaft is also provided with stop pin, the sidewall of described stop pin arranges groove, described pinion frame is provided with the projection coordinated with described stop pin upper groove, locking circle is had outside described stop pin, in space between described locking circle and described stop pin, self-locking block is set, when described motor quits work, described stop pin, described pinion frame, automatically locks between described self-locking block three;

    Rotating speed predetermined value N1 is stored in described memory cell, described current detection module detects current of electric, described voltage detection module detects the output voltage of described batteries, described control unit calculates according to the current of electric of described motor speed predetermined maximum N1 and detecting and maintains magnitude of voltage needed for rotating speed predetermined maximum N1 and current value, described voltage detection module detects the virtual voltage of described motor in real time, described control unit is according to the drive singal of the difference regulation output of the virtual voltage and the reference voltage that detect, thus maintenance motor speed.

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