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采用机械式力矩限制器的塔机,由于臂架形式、起重量曲线都服从一特定公式,因此可以不单独测起重力矩,只需测出吊重、臂架自重、小车自重等对臂根铰点的全力矩就能反映出起重力矩的变化。对上回转塔机来说,这个全力矩信号取之于塔顶主弦杆的变形;对下回转塔机,则取之于拉臂绳或转台构件的变形。这种限制器灵敏可靠,成本低,受到普遍欢迎,应用越来越多。对于它的设计、使用、试验应给予充分注意。然而最近新制订的《塔式起重机力矩限制器》标准(以下简称“标准”)仍把电子式力矩限制器作为重点,很多条款不适合这种
For the tower crane with mechanical torque limiter, since the boom form and lifting curve obey a specific formula, it is not necessary to measure the heavy moment separately. Only the crane root, the weight of the boom, and the weight of the trolley are measured. The full moment of the hinge point can reflect the change in lifting torque. For the upper turret machine, this full torque signal is taken from the deformation of the main chord at the top of the tower; for the lower turret machine, it is taken from the deformation of the pull arm rope or the turret component. This limiter is sensitive and reliable, low cost, widely welcomed and used more and more. For its design, use, testing should give full attention. However, the newly-developed “Tower Crane Torque Limiter” standard (hereinafter referred to as “the standard”) still takes the electronic torque limiter as the key point, and many terms are not suitable for this kind of