What are the basic functions and main types of crane weight limiters?
Automatic insurance function. The product has automatic insurance function, which can send out the alarm signal when the product has a failure. The overload protection device of main type lifting machine can be divided into automatic stop type and comprehensive type according to its function. According to its organization form, there are two kinds of electrical and mechanical types. Automatic stop type. It is to point to exceed the rated lifting weight lifting quality, can stop the crane to unsafe direction (lifting, arm, lower arm, etc.) continue to action, and allow the crane moves in the direction of security. All type lifting limiters. Is when lifting quality reaches about 90% of the rated lifting weight, can make a sound and light alarm signal, the lifting weight exceeds the rated lifting weight, can stop the crane continue towards unsafe action, and send out sound and light alarm signal, and allows the crane moves in the direction of security. Electrical weight limiter. It refers to the transformation of the mechanical energy between the electric energy and the protection function. The measuring load and other mechanical quantities are converted into corresponding electrical signals, amplifying, comparing, calculating and processing. It is the kind of product that is used to be electronic, electric, electromechanical and microcomputer. Mechanical weight limiter. It is the transformation and switch between mechanical energy and the switch.
Automatic working function. When the overload protection device is working properly, the function of the regulation should be automatically performed, and the additional operation of the crane driver should not be increased
The use of sensitive and reliable overload protection is an effective measure to improve the safety of crane and prevent overload. Basic function 1, dynamic load suppression function. The overload protection device should be able to distinguish the dynamic load effect of cranes in the normal operation of lifting, braking and running. The lifting of a crane (or the consolidation of the ground) shall be operated immediately. The additional dynamic load caused by hanging objects is the inherent dynamic phenomenon of hoisting operation. The delay technique can be adopted to prevent the effect of dynamic load. However, this delay may be a working blind area. If "stuck in this period of time, wire rope tension can be in a very short time to reach the extent of the damage to the crane, the products of this technology should solve this problem.
The weight limiter and the lifting torque limiter are collectively known as overload protection devices. Overload operation is one of the main causes of crane accidents. The heavy person caused the major accident that broke the beam, the inverted tower, the folding arm, the whole machine capsized.
