A safety brake is a brake that acts directly on the drum flange. Since it acts directly on the drum flange to form a parallel connection with the entire transmission chain, it is an effective way to improve the same reliability. Because the safety brakes have not been involved in the crane design specifications promulgated in China, there is no exact basis for designers to choose calculations, structural arrangements, etc. Design selection often relies on the regulations established by foreign safety brake manufacturers. Therefore, understanding the choice calculation method becomes the knowledge that the crane designer must master, and the purpose of the article. The brakes are specified in detail. The main content of the brakes is: in the case of a drive mechanism equipped with a brake, in the special case where the reducer itself fails, the brake cannot prevent the heavy object from falling. Allowable stress and movement. The hoisting mechanism must be equipped with a brake that can function and brake the test load in the event of a power failure or hoisting mechanism failure. The brake must have a safety factor of a minimum of 16 times. Dynamic tests shall not produce damaging shocks and impermissible brake heat. The electrical or mechanical system must be able to control the load within the permissible speed range. The hoisting mechanism must have two brakes that work independently of each other and each can meet the braking requirements of the system; the second brake must be braked relative to the first brake. In particularly critical situations, it is required to provide a safe brake even in the event of a failure of one of the reducers. This. When the safety brake reaches the rated speed of 15 times at the latest, the brake is started without deceleration. An emergency switch must be provided on the console of this type of crane to control the safety brake in time. The selection of the brake time of the safety brake is closely related to the braking time and the braking time. The acceleration and braking time of the crane's load lifting, rotation and boom amplitude are as follows: the magnitude of the acceleration is related to the parameters of the crane, and the value of the acceleration of the head of the boom selected in the actual design is as follows. The range is based on the speed of rotation of the crane and its unloading time.
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