ELECTRIC RIVET NUT TOOL AND CONTROL DEVICE THEREOF

摘要

An electric rivet nut tool has a motor, a torque adjuster and a control device. The control device drives the motor to rotate a driving shaft so as to set a rivet nut. The torque adjuster serves to adjust a preset torque value. When a torque generated by the driving shaft exceeds the preset torque value of the torque adjuster and it represents that the rivet nut setting job is completed, the torque adjuster then displace for the control device to detect the displacement and drive the motor to reversely rotate. Given the torque adjuster and the control device, the problems of being time-consuming, inefficient, increasing in cost and damage prone to rivet nut or motor upon setting rivet nut because of the manual switch of forward or reverse rotation of an electric rivet nut tool can be effectively resolved.

主权项

1. An electric rivet nut tool, comprising:
a body; a DC (Direct Current) power supply module mounted inside the body; a DC motor mounted inside the body and having a spindle; a torque adjuster mounted inside the body and having:
a pressing disc connected with the body;a steel ball disc having a driving shaft mounted through the steel ball disc and driven by the DC motor; anda spring mounted between and squeezed by the pressing disc and the steel ball disc; and a control device mounted inside the body and having:
a forward/reverse rotation module having:
an input port electrically connected to the DC power supply module;an output port electrically connected to the DC motor; andat least one control port;a switching module having:
an input terminal and an output terminal connected in series between the input port of the forward/reverse rotation module and he DC power supply module; anda control terminal;a control module electrically connected to the control port of the forward/reverse rotation module and the control terminal of the switching module, receiving a reverse rotation signal to control the forward/reverse rotation module to drive the DC motor to reversely rotate, and controlling the switching module to turn on or turn off; and a torque measurement unit electrically connected to the control module, detecting a movement of the steel ball disc of the torque adjuster, wherein the movement of the steel ball disc is used to determine if a torque outputted from the driving shaft of the torque adjuster is greater than a preset value, and the torque measurement unit sends the reverse rotation signal to the control module of the control device if the torque is greater than the preset value.