| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a device and a method for measurement of a deflection angle of a rope trolley type crane which facilitate power supply, mitigate effects of impacts produced during cargo handling, improve durability by eliminating the need of mechanical contact parts and reduce constraints on attachment places.SOLUTION: Torque current values Iand Iof motors 25' and 25 are measured by torque current sensors 26' and 26, respectively, and the load W g(W is mass, and g is gravity acceleration) of a suspended load including a grab bucket 8 is measured by a load meter 27. Then, in a controller 28, deflection anglesθandθof the suspended load are calculated through torque conversion factors determined by equationsθ=cos((W g)×D/(4×I×C)) andθ=cos((W g)×D/(4×I×C)), respectively, where D is diameter of the drum; and C is torque current value.</p> |
