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- Autors
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Semeyuk V. F., Vudvud O. M.
- Issue
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Hoisting and transport equipment, 2019, №1(60)
- Pages
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16-25
- DOI
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10.15276/pidtt.1.60.2019.02
- Abstract
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This article exposes the design of a new crane brake structure the spring-hydraulic one. Basic fmndamental idea of a spring-hydraulic brake development: here the brake torque is created not due to the braking device friction forces, but at the expense of the spring compression force, as in the braking device just the spring receives the crane movement kinetic energy.
Proposed is the spring-hydraulic brake structural scheme with the description of its operation principle. The designed brake structure has been subjected to a thorough study of the brake operation with different springs types. This research was conducted using a three-mass dynamic model that takes into account the spring-hydraulic brake used in the crane travelling mechanism design. Solving by a numerical method the differential equations system describing the crane braking process dynamic model, authors investigated the influence of different stiffnesses springs set in brakes specific with a linear characteristic on the magnitude of bridge crane metalwork and actuator dynamic loads. In the study, accepeted was the springs stiffening range from 1000 N/m up to 18000 N/m. At each calculation, the nature of change in forces influencing the bridge crane’s actuator and metal structurehas been determined as well as the maximum value of dynamic loads while time parameter and braking path registering. A separate studies cycle was carried out for a composite spring, which has three rigidity indexes; evaluated is its operability installed in the brakes. Transition to a greater rigidity resulted in abrupt raise dynamic efforts stil such a design allows a significant reduction in the overall spring-hydraulic brake dimensions.
In view of the developed design and research carried out, recommendations have been elaborated for the spring-hydraulic brake springs choice by stiffness index.
- Keywords
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bridge crane, spring-hydraulic brake, spring, spring stiffness, dynamic load
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