Address: JACK INTERNATIONAL TRADE CENTER, 518 JIASHAN ROAD, JIASHAN,ZHEJIANG,P.R.CHINA.
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1. Anti-falling Safety Device Anti-falling safety devic […]
1. Anti-falling Safety Device
Anti-falling safety device is an important part of construction hoist. It should be relied on to eliminate the occurrence of cage falling accident and ensure the safety of passengers. Therefore, the ex-factory test of the anti-falling safety device is very strict. Before leaving the factory, the legal inspection unit carries out the measurement of the torque, the critical speed and the spring compression, each of which has a test report attached. After being assembled on the construction elevator, the drop test under the rated load is carried out, while the elevator in use on the construction site. Fall tests must be conducted every three months. For the two-year-old anti-falling safety device (the date on which the anti-falling safety device leaves the factory), it must also be sent to the legal inspection unit for testing and inspection, and then every year for testing. So far, few people have sent for inspection, some sites even do not do a fall test every three months, all think that their anti-fall safety device is not a problem, but once an accident happens, they regret it. Why not regularly test and submit inspection according to the system? Users blindly think it's good if it's not bad. In fact, the quality of anti-falling safety devices can only be judged by testing and inspection. It is impossible to determine whether they are good or bad in daily operation. For those over-serviced anti-falling safety devices, it is suggested that early inspection and regular testing be better. Only by having a good idea can malignant accidents be prevented in the future.
2. Safety switch
Safety switches of elevators are designed according to safety needs. They include fence gate limit, cage gate limit, top gate limit, limit switch, upper and lower limit switch, rope breaking protection switch, etc. In order to save time, some limit switches are artificially cancelled and short-connected or not repaired in time after being damaged on some construction sites, which is equivalent to canceling these safety lines and planting potential accident hazards. Example: The suspension cage should be loaded with long things, and the suspension cage can not be placed without extending out the suspension cage, while the artificial removal of the threshold or ceiling limit, in the case of imperfect or imperfect safety facilities mentioned above, still carry people and goods. This kind of illegal operation is a joke on human life. In order to avoid the occurrence of potential accidents, we hope to use the unit collar. Guidance and management should be strengthened. Lift maintenance and operators should be strictly required to regularly check the safety and reliability of various safety switches to prevent accidents.
3. Wear and replacement of gears and racks
In the construction site, the working environment is harsh, cement, mortar and dust can not be eliminated, and the gear and rack grinding each other, the teeth are sharpened and still in use, which should be paid attention to. It is well known that the tooth shape should be like a cantilever beam. When wearing to a certain size, the gear (or rack) must be replaced. To what extent will wear and tear be stopped and replaced? It can be measured by 25-50mm common normal micrometer. When the length of the common normal of the gear wears from 37.1mm to less than 35.1mm (two teeth), it is necessary to replace the new gear. When the rack wears out, the rack must be replaced when the chord height is 8 mm and the thickness of the rack wears down from 12.56 mm to less than 10.6 mm. However, many old gear and rack elevators on the construction site are still in overtime service. For the sake of safety, new accessories must be replaced.