Four mandatory inspections for products such as Hebei Fanggong steel wire rope electric hoists before leaving the factory

　　1. General inspection 2. No load test 3. Rated load test 3. Dynamic load test

　　(1) General inspection 1: Check whether the structure, power supply, specifications, etc. of the electric hoist meet the technical requirements. 2) Use a 500M Ω megohmmeter to check the metal insulation resistance of the live and non live parts of the electric hoist. 3) Check whether the electric hoist has a grounding mark and visually inspect whether the grounding screw is tightened. There should be no paint or rust marks at the grounding connection, and the grounding resistance value should not exceed 01 Ω. 4) The correctness of wire rope winding and the reliability of rope end fixation. Is the oil level of the reducer leaking? 5>The flexibility of the hook pulley group should be such that both the hook and pulley can rotate flexibly 360 degrees. 7) Check whether the electrical installation and fixation are secure, and whether the wiring arrangement is correct. When the motor has temperature monitoring, check the condition of the thermal control components. (2) The no-load test shall be conducted at rated frequency and voltage for no less than two cycles of up and down operation. The following inspections and tests shall be conducted.

　　Record the voltage and current of each phase of the electric hoist.

　　2) Check the function of the limiter and the phase error protection function.

　　3) The assembly quality of the rope guide should be such that, with the steel wire rope firmly fastened, the lifting mechanism is activated to lower the hook, and the drum rotates 2 turns. The steel wire rope should be able to smoothly discharge from the rope guide outlet.

　　4) The axial movement of the tapered motor shaft should be visually measured to be around 1 while jogging, otherwise it should be adjusted in a timely manner.

　　5) The no-load noise of the running car shall be measured when the car is idling without running on the track. The sound level meter shall be measured 1111 away from the sound source in four directions on a horizontal plane, and the maximum value shall be taken.

　　(3) Rated load test

　　1) Measurement of the lifting speed of electric hoists. At rated frequency, rated voltage, and rated load, when the lifting distance exceeds 05m, use a stopwatch to control the time, measure the lifting distance within 10s, or take a fixed distance to measure the required time. Calculate the lifting speed and take the average of 4 measurements.

　　2) Noise measurement of lifting mechanism: At rated frequency, rated voltage, and rated load, the starting point for distance measurement is the maximum overall size of the entire machine on the test bench, and the measurement points are arranged on parallel lines extending outward from the starting point. The distance between the measuring point and the reflecting surface and other objects should not be less than 1m, and the distance from the wall corner should not be less than 2m.

　　3) Measurement of the braking sliding distance of the electric hoist with a steel wire rope: Under the rated frequency, rated voltage, and rated load, the braking sliding distance for stable descent is measured. Generally, a small thallium is lifted with a thin steel wire rope, and a fixed position is used. Alternatively, the relative position between the drum and a certain point on the shell can be used to measure the sliding distance. The average value is taken four times in a row.

　　Record voltage and current.

　　5) Voltage reduction test: Under rated load, the electric hoist is subjected to voltage reduction on the test bench according to the voltage reduction indicators specified in the grading standards, that is, the voltage at the motor inlet is adjusted to the specified voltage reduction indicators before the test.

　　(4) The dynamic load test should be conducted on a test bench, with the overload protector of the electric hoist not working, according to the specified test load