Abstract
Different values of tension forces in the load-bearing ropes of elevators, which push the rope into the grooves of the traction discs with different pressure, are the cause of uneven wear of the grooves of the traction discs under operating conditions. Current technical standards in the EU stipulate that the load suspended on load-bearing ropes be evenly distributed to all ropes used, using one of the many construction designs for tension force equalizers in the rope system. The main subject and primary objective of this paper are to present the construction design, 3D model and produced device of one of four produced prototypes, which were constructed in the “Research and Testing Laboratory”, and allow setting of differing values of tension forces in the system of ropes of a traction elevator, to values of the same size. Laboratory measurements were performed on the produced device, which enables the detection of tension forces in ropes and the magnitude of these forces in the required period to be graphically displayed on a PC. The prototype tension force equalizer can show the functionality and practical applicability of the procedure of balancing the levels of tension forces, which are of unequal strengths at the start of the laboratory measurement.
Highlights
The elevator car must be allowed to travel as high as possible in the elevator shaft
The minimum distance of the upper surface of the bracket from the ceiling of the elevator shaft places a fundamental requirement on the design height of tension force equalizers, which are installed at the ends of the threaded parts of the suspension bolts
This paper presents a sequence of activities and a description of the operations, which when using a tension force equalizer, result in the weight of the load in the final phase of the experiment being evenly distributed in all cross-sections of the load-bearing ropes
Summary
The elevator car must be allowed to travel as high as possible in the elevator shaft. This is ensured by installing the load-bearing rope bracket at the shortest possible distance from the ceiling of the elevator shaft. Mobile tension force equalizers have relatively large heights and their use to balance varying tension forces to the same magnitude in a rope system is not always suitable in cases where there is a lack of operating space and the construction height is limited. The principles of tension force equalizers suitable for use in cases of restricted operating spaces and low ceiling height in the elevator shaft are introduced in [3,5]
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