Developing an advanced safety device for bridge-type cranes

Introduction. Experimentally revealed disadvantages of domestic complex safety devices in the part of load capacity limitation and parameters registration are described. The reasons why it is inadmissible to re-equip cranes under the control of foreign safety systems to the existing domestic devices are explained. It is suggested to achieve the safety of such cranes through the development of safety devices that take into account the dynamic characteristics of a particular crane and control algorithms of its drives.

Materials and methods. The study was done using the developed safety device realizing the functions of load capacity limitation, automatic determination of the parameters of the load capacity limiter algorithm, determination of the crane operation intensity. The description of these algorithms in relation to cranes equipped with frequency control system is given. Experimental determination of operational parameters of the device is carried out on an overhead crane equipped with the ControlPro safety system (KoneCranes).

Results. The use of the device allowed to decrease the dynamic coefficient in the whole range of lifted loads masses. A twofold reduction of the dynamic component was obtained when lifting near-nominal loads. The accuracy of characteristic number determination was 1.3%.

Discussion and conclusion. It is demonstrated that the developed algorithm of load capacity limitation allowed not only to increase crane security, but also to reduce the loading on the crane, in comparison with the standard safety system. The accuracy of operating parameters determination in conditions of real technological process satisfies the requirements of normative documentation. Thus, the possibility of duplicating or replacing some functions of the standard safety system by using the developed device is shown.

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