What are the requirements for safety tongs and speed limiters?
The speed limiter shall be fully accessible in any case. If the speed limiter is installed in the hoistway, the operator shall be able to approach it outside the hoistway.
Overspeed governor speed setting, the adjustment part should be sealed down. For a speed limiter with a record shift or verification period up to 5 years, it shall be checked again. (7) the speed limiter shall have a nameplate, and the nameplate shall have an electric protective switch, working speed, speed of action, manufacturing unit and so on
When the speed limiter works, the rope tension of the device is not less than the larger of the following values: 200N or two times as much as the force required by the safety tongs.
The speed limit of the car speed limiter is not less than 115% of the rated speed, and not more than 1.25m / s. The speed of the counterweight shall be at least 10% higher than that of the car, but shall be no greater than 1.4m / s.
When the rated load is greater than 250kg, the car should be equipped with a safety wrench device (can be instantaneous). The actions of the car and counterweight safety devices shall be controlled by their respective speed limiters or by means of the rupture of the suspension or by means of a safety rope.
