Patent ID: 11942767
Assignee: TAIZHOU DAWEI ELECTRIC APPLIANCE CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. The threading device suitable for a building electrical pipeline according to claim 5, wherein the take-up and pay-off main machine further comprises a take-up and pay-off switch circuit, the take-up and pay-off switch circuit comprises a three-gear adjusting operation button, a power supply conversion module, the first microswitch, a second microswitch, a third microswitch, the first electromagnet, the fan, the take-up motor, the clutch motor, a capacitor, a first direct-current relay, a second direct-current relay and a third direct-current relay; the three-gear adjusting operation button has a threading gear, a standby gear and a take-up gear;
when the three-gear adjusting operation button is located at the threading gear, the fan is connected with an external power supply, the first direct-current relay is connected with an internal power supply subjected to voltage reduction through the power supply conversion module, a second electromagnet of the first direct-current relay is powered on, and the second electromagnet is converted to enable a first contact switch of the first direct-current relay to be switched on the capacitor;
when the three-gear adjusting operation button is converted to the standby gear from the threading gear, the fan is powered off, the first direct-current relay is also powered off, the first contact switch of the first direct-current relay is changed to enable the capacitor and the first electromagnet circuit to be connected, and the first electromagnet attracts the brake pad to enable the transmission shaft to stop rotating;
when the three-gear adjusting operation button is switched to the take-up gear from the standby gear, the take-up motor is connected with the internal power supply subjected to voltage reduction through the power supply conversion module; the second direct-current relay and the third direct-current relay are also connected with the internal power supply subjected to voltage reduction through the power supply conversion module, a third electromagnet of the second direct-current relay is powered on, a fourth electromagnet of the third direct-current relay is powered on, a second contact switch of the second direct-current relay is converted to enable a positive electrode of the clutch motor to be connected to a negative electrode of the internal power supply, a third contact switch of the third direct-current relay is converted to enable a negative electrode of the clutch motor to be connected to a positive electrode of the internal power supply, the clutch motor rotates backwards, the motor base is driven by the tension spring to drive the driving gear on the take-up motor to be meshed with the driven gear on the transmission shaft, after the driving gear is meshed with the driven gear, the second microswitch makes contact with the motor base, the second microswitch disconnects the connection between the positive electrode of the clutch motor and the negative electrode of the internal power supply, and the clutch motor is powered off and stops running;
when the three-gear adjusting operation button is switched to the standby gear from the take-up gear, the take-up motor is powered off and stops running; and the second direct-current relay and the third direct-current relay are also powered off, the second contact switch of the second direct-current relay is converted to enable the positive electrode of the clutch motor to be connected to the positive electrode of the internal power supply, the third contact switch of the third direct-current relay is converted to enable the negative electrode of the clutch motor to be connected to the negative electrode of the internal power supply, the clutch motor rotates forwards, the motor base is driven by the motor base pushing mechanism to enable the driving gear on the take-up motor to be separated from the driven gear on the transmission shaft, after the driving gear and the driven gear are separated to a certain distance, the third microswitch makes contact with the motor base, the third microswitch disconnects the connection between the negative electrode of the clutch motor and the negative electrode of the internal power supply, and the clutch motor is powered off and stops running.