Search

In this paper, we show the solution for the realisation of two ramps for embarking tourists starting from the construction of the cage with two storeys,wich doubles the transportation capacity for the Unirea shaft at the SlănicPrahova Saline, in order to enlarge the persons transportation flux on the shaft.

Gear boxes must provide for the automobile with the best dynamic and economic qualities for the power and revolution of the internal combustion engine. In order to do this, it must have a simple design, light weight, reduced gauge, high reliability and easy maintenance. In this paper, based on the constructive solutions and the geometric elements that were calculated, we obtained a 3D modelling of the elements of the transmission of a gear box and the assembling of these elements in order to obtain the constructive dimensions of the gear box and in order to verify the other composing elements (shafts, bearings, synchronization mechanisms).

In the paper there are presented certain aspects concerning the determination of the state of strain and displacements from the structure of the towers of the extracting installations due to the loads transmitted through the bearings of the extracting pulleys in the case of the application of the emergency brake, on the increase of speed above the maximum admitted, a case considered perturbation or emergency.

Every extraction machine is endowed with a braking system while ensure the right movement of the hoisting vessels, or allows to stop the machine in a certain position of the vessels (brake tests) and the automatic brake device, independently of the operator will, in one of the following situations, considered to be perturbations or damages: tension absence, pressure drop of the working fluid in the braking system circuit, the overraising of the extraction vessels, exceeding the limit speed, overload etc. (safety–braking). Speed decrease made by the brake system must be between 1,5–5 m/s2 and the delay length of the brake (from the action release till the effective application) at the most 0,7 s. Constructively, the brake system consists of two components: the working mechanism and the actuating system. Upon the working system, the common brakes can be with disk or with shoes, and from the point of view of actuation, can be with weights and, spring assembly, pneumatics, hydraulics and combined. Braking–mechanism diagnosis for the mi-ning hoisting machines consists in establishing the real safety factors when the safety–brake is applied and when operating brake is applied too. The experimental measurements have been made at the Auxiliary Blind Shaft no.11 at Lonea Mining Plant in order of examination and regulation the hoisting machine.

The development in safe conditions of the extracting process continuously imposes the need of optimal functioning of the extracting installations as important links in the transport flow. Diagnosis of winding engine brake mechanism in mines is important to provide normal extraction vessel movement in the shaft, or stopping machines in a certain position of the vessels in disturbances or failures. The paper presents the calculus of safety coefficients in the use of safety and maneuver brakes. Mine winding engines brake mechanisms is important to provide normal extraction vessel movement along the shaft, or stopping the engine in a certain position of the vessel in disturbances or failures. To assess the real safety coefficient, results obtained by tensiometric measurements were used. After diagnosis, necessary information is obtained to improve present maintenance system and repair this category of machines in view of increasing safety in use of winding installations, with possibility of monitoring brake mechanism...

Winding installations have the role of transporting, between underground and surface, useful minerals, materials, equipment, and people, with extraction vessels. Cable connecting devices connect winding installation cables to extraction vessels. Depending on their design, connecting cables can be: with loop and core, self-tightening with wedged core on one or both sides; with hinged jaw; with cone-shaped friction wedges; with wedges and bridles. The paper presents an analysis of flat metal cable connecting devices.

To study the operation of the winding machine in the Old Shaft with Skip in Lonea Mining Plant, the dynamic analysis of the driving wheel (Koepe wheel) was performed, by resistive electric tensometry methods, acceleration measurements, and vibromechanical analysis on the bearings of Koepe driving wheels, on functioning cycles and vibromechanical analysis of the reduction gear. The paper presents aspects regarding vibromechanical measurements and resistive electric tensometry methods in the winding machine..

Winding installations have the role of transporting, between underground and surface, useful minerals, materials, equipment, and people, with extraction vessels. Cable connecting devices connect winding installation cables to extraction vessels. Depending on their design, connecting cables can be: with loop and core, self-tightening with wedged core on one or both sides; with hinged jaw; with cone-shaped friction wedges; with wedges and bridles. The paper presents an analysis of circular self-tightening metal cable connecting devices wedged on both sides, meeting the requirements of STAS 12519/87.

In municipal solid waste, aluminum is the main nonferrous metal, approximately 80- 85% of the total nonferrous metals. The income per ton gained from aluminum recuperation is 20 times higher than from glass, steel boxes or paper recuperation. The object of this paper is the design of a 300 kN press for aluminum box bundling.