Safety device for lifting platform

In order to ensure the safety factor of the lifting platform, there are many safety devices for the lifting platform. Today we will talk about the anti-fall safety devices and safety switches:

    1. Anti-fall safety device

The anti-falling safety device is an important part of the lifting platform, and it is necessary to rely on it to eliminate the occurrence of cage falling accidents and ensure the safety of the occupants. Therefore, the factory test of the anti-falling safety device is very strict. Before leaving the factory, the legal inspection unit will measure the torque, measure the critical speed, and measure the spring compression. Each unit is accompanied by a test report and assembled on the elevator. The drop test under the rated load is carried out, and the lifting platform in use on the construction site must be dropped every three months. The anti-falling safety device of the lifting platform that has been delivered for two years (the date of delivery of the anti-falling safety device) must also be sent to the legal inspection unit for inspection and testing, and then tested once a year. So far, very few people have sent for inspection, and some construction sites do not even do a drop test every three months, thinking that their anti-fall safety devices are okay, but once an accident occurs, they regret it. Why not test and submit for inspection regularly according to the system? It is good if the user unit blindly thinks that it is not bad. In fact, the quality of the anti-falling safety device can only be judged through testing and inspection. It is impossible to determine whether it is good or bad in daily operation. For those anti-falling safety devices that have been in service for an extended period of time, it is recommended to submit for inspection and regular Experiments are good, and only by knowing what to do can we prevent serious accidents before they happen. (Detection of anti-fall safety devices can be sent to: Changsha National Construction Machinery Quality Inspection Center, Shanghai Academy of Construction Sciences, Shanghai Jiaotong University, etc.)

    2. Safety switch

The safety switches of the lift are all designed according to safety needs, including fence door limit, cage door limit, top door limit, limit switch, upper and lower limit switch, counterweight anti-break rope protection switch, etc. In some construction sites, in order to save trouble, some limit switches are manually cancelled and short-circuited or damaged and not repaired in time, which is equivalent to canceling these safety lines of defense and planting hidden accidents. Example: The hanging cage needs to be loaded with long things, and the hanging cage cannot fit inside and needs to be extended out of the hanging cage, and the door limit or top door limit is artificially canceled. In the case of imperfect or incomplete safety facilities mentioned above, still carry people and loads This kind of illegal operation is a joke on human lives. In order to avoid hidden dangers of accidents, it is hoped that the leaders of the unit will strengthen management, strictly require the maintenance of the lifting platform and the operators to regularly check the safety and reliability of various safety switches to prevent accidents.

In order to ensure the safety factor of the lifting platform, there are many safety devices for the lifting platform. Today we will talk about the replacement of gears and racks, the temporary load rate and the buffer:

    3. Wear and replacement of gears and racks

During the construction on the construction site, the working environment is harsh, and cement, mortar, and dust cannot be eliminated. The gears and racks are grinding each other, and the teeth are still in use after they are sharpened. This should be taken seriously. As we all know, the tooth profile should be like a cantilever beam. When worn to a certain size, the gear (or rack) must be replaced. To what extent should I stop using it and replace it with a new one? It can be measured with a 25-50mm common normal micrometer. When the length of the common normal of the gear is worn from 37.1mm to less than 35.1mm (2 teeth), a new gear must be replaced. When the rack is worn out, measured by the tooth thickness caliper. When the chord height is 8mm, the tooth thickness is worn from 12.56mm to less than 10.6mm. The rack must be replaced. However, there are many "old teeth" gears on the construction site. The platform is still in overdue service. For safety reasons, new parts must be replaced.

    4. Temporary load rate

The elevators on the construction site are frequently operated and the utilization rate is high, but the problem of the intermittent working system of the motor has to be considered, that is, the problem of the temporary load rate (sometimes called the load duration rate), which is defined as FC=work cycle time/load Time × 100%, where the duty cycle time is the load time and down time. The lifting platform on some construction sites is rented by a leasing company and always wants to make full use of it. However, the temporary load rate of the motor (FC=40% or 25%) is completely ignored. Why doesn't the motor generate heat? Some are still in use even with a burnt smell, which is very abnormal operation. If the elevator transmission system is poorly lubricated or running resistance is too large, overloaded, or frequently started, it is even a small horse-drawn cart. Therefore, every driver on the construction site must understand the concept of duty cycle and act according to scientific laws. This kind of motor itself is designed for intermittent operation.

    5. Buffer

The last line of defense for the safety of the lifting platform of the buffer on the elevator, first, it must be installed, and second, it must have a certain strength, can withstand the impact of the elevator's rated load, and play a buffer role. And now many construction sites, although some are set up, but not enough to play a buffer role, there is no buffer at all on the construction site, this is extremely wrong, I hope that the user will pay attention to the inspection and do not underestimate this last line of defense.