L48A1 Mast Sectionthe function of the weight limiter in the tower crane? What is its construction and working principle
The tower crane has a variety of safety devices such as restrictors, which can effectively reduce the occurrence of tower crane accidents. In this paper, the function, structure and working principle of the weight limiter for tower crane will be explained and analyzed. Part of the content by the tower crane construction Co., LTD. (http://www.fx68.net) arranged in the network, only for the majority of the tower crane industry for reference. If you have any questions, please let us discuss together.
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1. Function as a weight limiter:
When the lifting load exceeds the rated load, the lifting weight limiter can output electrical signals, cut off the lifting control circuit, and send an alarm to prevent the tower crane from overloading.
In the current national standard "tower crane safety regulation" regulation: tower crane should be installed on weight limiter, if equipped with lifting weight display device, the numerical error shall not be greater than the actual value of 5%, when the maximum rating of lifting weight is greater than the corresponding block and less than 110% rating, the direction of the power supply shall be cut off the lifting mechanism rise, but as a decline in the direction of the movement.
2. Construction and working principle of lifting weight limiter:
At present, the structure of the most commonly used weight restrictor is the force measuring ring, which is composed of the force measuring ring, the guide pulley and the limit switch. It is characterized by compact size, good performance and ease of adjustment. FO/23B, QT80 and other tower cranes generally adopt various such structural forms. One section of the force measuring ring is fixed on the support of the tower crane mechanism, and the other end is fixed on the guide pulley.
Working principle: when the tower crane is lifting the load, the pulley passes the force to the force measuring ring when the combined force of the wire rope ACTS. The deformation of the force measuring ring is proportional to the load. The force from the pulley varies according to the size of the lifting load. Proving ring shell with the force deformation, proving ring inside the solid metal lath and proving ring shell, and with the shell stress deformation and extension, this time according to load condition to adjust fixed on the metal strip adjustment bolt and limit switch distance, when the load exceeds the rated lifting weight limit switch action, so as to cut off the power of the lifting mechanism, achieve the goal of on lifting weight overload limit.
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