Lift freight elevator weight overload

　　Lift freight elevator weight overload detection knowledge

　　?In China, the rated load of the freight elevator is generally indicated in the prominent position of the lift freight elevator, but the lift freight elevator does not have an overload protection automatic control system. The automatic control system for overload protection of freight elevators in foreign countries is also not perfect. Now, through the intelligent control of overload protection in the electronic control system of the freight elevator, it has good practical value for eliminating the violation behavior of the freight elevator operator, the behavior habits of the production workers who use the freight elevator, and the prevention of misoperation.

　　The installation of the weight overload detection is based on the original construction of the freight elevator. A pressure transmission sensor is installed at the rope head of the fixed car side of the lifting platform machine room. The sensor is added here to directly measure the weight of the induction freight elevator. Installation is also more convenient, as long as you can make an additional rope head board. Because the wire traction method of the freight elevator cabin is the one end of the steel wire rope fixed at one end of the elevator car, the other end of the wire is transferred to the main traction wheel by the top wheel of the elevator car. The wire rope is retracted from the main body traction wheel and then the rope weight of the freight elevator. Fixed to the beam on the freight elevator machine room. The lifting box of Car Lifts Manufacturers the lifting freight elevator is the car body hung on the sliding wheel. The pulling force on the wire rope fixing beam at one end of the lifting box is half of the total weight of the car, so the traction ratio of the sensor is 2:1.

　　??In addition, once the weight of the freight elevator is overweight, the emergency start system of the freight elevator is also terminated; the direct elevator function of the freight elevator is terminated; the emergency stop function of the freight elevator when the power failure occurs cannot be put into operation. Once the weight of the freight elevator is overweight, the load of the material exiting the freight elevator must be less than 95% of the rated load capacity of the freight elevator. The overload alarm and locking device of the freight elevator will be automatically reset. If the lift freight elevator is to be overloaded, the overload protection system can be easily removed from the freight elevator control system by a command switch to tu off the overload protection function.

　　In practical application, the weight loss of the freight elevator during operation is eliminated. Before the weight overload detection system is put into operation, the freight elevator is operated up and down, and the upward and downward weights of each landing are recorded to the controller respectively. In the register, the data of the car in the current landing is read from the register, and the weight of the car is automatically removed to detect the net weight in the car. When the weight overload control requires that the load of the freight elevator reach 95% of the rated load capacity, the lifting platform can only drive directly to a specified up (or down) floor. When the load of the freight elevator reaches 100% of the rated load, the freight elevator overload will automatically alarm. At this time, the freight elevator door cannot be closed. The freight elevator cannot be started.