ISSN - 2391-9361

Volume 14, issue 1

SYSTEMY WSPOMAGANIA W INŻYNIERII PRODUKCJI

1

vol. 14, iss. 1/1

Łukasz BOŁOZ
Influence of the form and state of wear of drill bit tip on the efficiency of the rotary drilling process performed with a hand-held hydraulic drill

Abstract: In the mining and construction industries, hand drills are used to carry out many processes related to excavation and auxiliary works. Hand drilling is commonly applied for making small diameter holes, especially in hard-to-reach places. In the case of manual drilling, an important parameter is drilling resistance, especially torque. Drilling tools are subject to wear, which has a negative impact on the process of drilling, including resistance and efficiency. A blunt tool lowers the drilling speed and puts more strain on the operator. The article presents the results of laboratory tests of selected parameters of the drilling process carried out with a hydraulic rotary drill. The tests were performed with the use of new drill bits as well as drills characterized by a various degree of wear. The tests were carried out for popular, frequently applied rotary drilling tools, on a unique laboratory stand that enabled setting the feed force and measuring the torque, rotational speed, drilling path, drilling speed as well as the in and out pressure of the drill. A number of characteristics were determined as a function of time and depth of the drilled hole. It was found that tool blunting affects the drilling process in various ways, whereas the intensity of this influence is determined by the type of blunting. The test results can provide a basis for developing a criterion for replacing a drill bit with a new one.

Keywords: rotary drilling, hydraulic drill, hand-held drill laboratory tests, mining drill

2

vol. 14, iss. 1/2

Tomasz ROKITA, Paweł MOLIK, Rafał PASEK
Modernisation of the skip hoist of the Daniłowicz shaft – conceptual design

Abstract: The article discusses the concept of modernizing the mining cage of the Daniłowicz Shaft's mining elevator to increase the capacity for transporting people and materials. The proposed solutions aim to improve work efficiency and optimize the use of vertical transportation equipment. The article presents conceptual solutions related to the modernization of the mining cage, allowing for an increase in its dimensions while maintaining the parameters of the shaft's cross-section and the hoisting machine. These changes will enable a more efficient use of technical and organizational resources while ensuring the comfort and safety of transportation. The project also takes into account the legal regulations of geological and mining law, which are essential in mining operations.

Keywords: shaft, vertical transport, hoisting conveyances

vol. 14, iss. 1/3

Tomasz ROKITA, Rafał PASEK, Krzysztof ROZWADOWSKI Karol SZCZEPANIEC
Investigations into the possibility of measuring the weight suspended on the hoisting rope cooperating with the hoisting machine in the mine shaft hoist of the Daniłowicz shaft in the “Wieliczka” Salt Mine

Abstract: The article you've mentioned discusses the issue of measuring the suspended weight on the hoisting rope in mining shafts. The shaft and its equipment are essential components of the technical infrastructure of a mining facility, serving various functions such as transportation of people and materials, ventilation of mining workings, and the transport of fluids. Designing an efficient vertical transport system is a continuous challenge. The article presents a method for measuring the weight suspended on the hoisting rope by utilizing measurements of the stresses occurring in the brake stands of the hoisting machine. This research was conducted at a testing station located in the Daniłowicza shaft of the Wieliczka Salt Mine. The use of this weight measurement method, and subsequently, the measurement of forces in the ropes, can be employed in the operation of the hoisting machinery to eliminate dynamic disturbances that occur during their operation. Additionally, the measurement data can be used as an additional element of the safety system, particularly for two-step braking. The system can also detect overweight conditions during the startup of the hoisting machinery. Therefore, this innovative method for two-step braking. The system can also detect overweight conditions during the startup of the hoisting machinery. Therefore, this innovative method for measuring the suspended weight on the hoisting rope can have a wide range of applications in the control systems of hoisting machines.

Keywords: hoisting machinery, hoisting conveyance, hoisting conveyance

vol. 14, iss. 1/4

Łukasz Bołoz
A unique LHD loader solution designed for work in low underground mine workings

Abstract: The article discusses the results of comparative numerical tests involving typical operating systems of LHD loaders and a proprietary solution based on a patent. LHD loaders are categorized as fundamental machines utilized in various operating systems, including room-and-
pillar methods. Due to the thickness of deposits, mining often takes place in low workings. For conventional T-kinematic or Z-kinematic systems, operating LHD loaders becomes more challenging. In low height excavations, the material needs to be loaded in multiple cycles. Smaller
machinery generates less thrust force, which negatively impacts loading efficiency. Additionally, there are common operational issues related to hydraulic actuators, whose piston rods may suffer mechanical damage and loss of tightness. In the proposed proprietary working system, the bucket
is connected to a telescopic boom driven by hydraulic rotary actuators. Furthermore, the loader is equipped with stabilizers to enhance its stability. The integration of rotary actuators and a lowered pivot point for the bucket, alongside the telescopic arm and stabilizers, allows for loading
the bucket in a single cycle. The article presents the results of simulation tests of three kinematic systems, analyzing factors such as the bucket's movement, cycle duration, hydraulic oil demand, and the load on critical structural elements and joints. The research indicates that the proposed
solution can effectively compete with traditional systems in terms of load capacity and oil demand while providing advantages in functionality.

Keywords: underground loader, Z-kinematic system, LHD loaders, low workings, T-kinematic system, model tests, dynamic tests