There are two buttons on the control handle, one up and one down, and four offline switches. The two wires with the largest resistance are connected at both ends of the capacitor, and the remaining two wires are connected to the common line one by one. The toggle switch switches the circuit by toggling the switch handle, so as to achieve the purpose of switching the circuit. Commonly used toggle switches are unipolar two-position, unipolar three-position, bipolar two-position and bipolar three-position.
Extended data
structure principle
The small crane consists of two parts: the power unit and the support.
1. The power unit consists of motor, reducer, clutch, brake, rope drum and steel rope. The motor is a paramagnetic single-phase capacitor motor with a power-off braking mechanism; The motor is also equipped with a thermal switch to prevent the motor from overheating and burning; The reducer is a two-stage gear reducer and is fixedly connected with the motor; Clutch, brake and flying tube are integrated, but when the clutch is in the disengaged state, it can realize rapid descent, and the descent speed can be controlled by operating the brake to avoid impact.
2. The round hole in the front of the power plant shell can be used to install the blower, and the user can equip the blower for forced cooling as required. The shell itself has a toolbox, which contains a clutch handle, a special wrench with a brake handle, a jack nut washer, a rod top cap, a button starter, a travel switch, wires and instructions.
3. The bracket consists of a main rod and a rotating arm, and the rotating arm consists of a screw, a jack nut and a vertical rod. The rotating arm can rotate 360 degrees on the main rod, and the end of the arm is provided with a travel switch to prevent lifting accidents caused by operation errors or button failure.
4. The positive and negative rotation of the motor can be realized by operating the button starter, and the winding and release of the steel wire rope can be realized, and the operation of lifting the object can be completed through some pulleys of the bracket.
Use skills
After the machine is installed, one person can carry out lifting operation from top to bottom. Special attention should also be paid to the following two points during use:
1. After the first lifting, tighten the 1000-pound nut again. In the future crane operation industry, it is also necessary to check whether the nut is loose.
2. Clutch engagement and disengagement must be carried out under no-load condition, and the stroke should be guaranteed to be zero.
3. It is not allowed to slip off the clutch with load.
Baidu encyclopedia-Xiaohe