Recovery of the safety device:
Except for drop test, if the safety device braking happens, before recovery operation the safety device action reason should firstly be investigated, at the same time the followings should be identified
1) Whether the brake works normally.
2) Whether the turbine pair and the coupling work normally.
3) Whether the guide rolling wheel and support rolling wheels work normally.
4) Whether pinion and the rack work normally.
5) Whether position limited structure on the safety device work normally (when
inspection the electric circuit should be switched off).
We use internal brake drum and centrifugal governor and adopt forge die process instead of traditional casting process in order to keeping away from potential security problems.
The safety device is made of sliding bearing manufactured by China leading company and Changcheng's high-quality grease selected specially. There is one more grease groove designed purposely in gear shaft. Meanwhile, there is unique silencer and shock-absorber to reduce voice as far as possible.
The spring parts and frictions are produced by our country company which manufactures specifically. Therefore the brake torque and open speed are stead. What's more, safety device can react fast and brake smoothly.
(Tell us the model and calibration movement speed)
SAJ serials pinion and cone progressive safety device is the most important safety device in the pinion and rack builders hoist, which can prevent the cage running over speed, and effectively reduce the cage dropping accident.
The safety devices developed by Shanghai Research Institute of Building Sciences has passed through the evaluation presided by the Ministry of Construction in 1989. The specialists at the meeting made a high appraisal of reasonable compact structure, stable action speed, highly accurate calibration, safe and reliable, braking smoothly and light weight etc. features of the safety devices.
The devices was recommended as hightech products developed in National Eighth Five Year Plan by the Ministry of Construction, and also won the Shanghai excellent new product prize.
Audited Supplier 
){kind=link}
){kind=link}