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1

Monitoring of selected parameters of the belt transmission on a specific design solution

100%

Mascenik J. , Krenicky T. , Ruzbarsky J. , Coranic T.

Mining Machines

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2024

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tom vol. 42, iss. 4

240--248

EN

Belt drives have been used for decades to transmit power from a drive unit to an end device in a variety of applications. There is constant scientific, technical and technological progress in the production and use of belts, which has led to a variety of types and types of belts. Belt drives have several advantages over other methods of power transmission, including light weight, affordability, and the ability to be used as a slip clutch. As the requirements for V-belts increase, so does the required quality of the offered belts. When analyzing belt transmissions, it is also possible to examine their influence on other components of the machine or equipment on which they are installed. If the belt drive transmits large forces, this can have consequences on the bearings and other parts of the transmission. It is therefore essential to ensure that belt drives are optimally designed and installed to minimize potential damage to other components. On the designed specific design solution for testing belt transmissions, the actual revolutions of the input and output pulleys were monitored, the belt float was measured using high-precision distance measurement sensors, and the vibrations were measured using a magnetically fixed sensor. During the experimental measurements, parameters such as belt tension, input speed and output load were changed. The experimental measurements themselves were carried out on three A1450Lw 13x1420Li belts of the same dimensions, but manufactured by other manufacturers (Optibelt, Rubena and Gufero).

2

Operating characteristics of bearings with magnetic nanoparticles doped lubricant

100%

Krenicky T. , Mascenik J. , Coranic T. , Ruzbarsky J.

Mining Machines

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2023

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tom vol. 41, iss. 3

168--174

EN

The main aim of the presented research was to investigate theoperational characteristics of a bearing when alternative lubricants were used for comparison with a standard lubricant, including that containing magnetic nanoparticles. The bearing was subjected to varying operating conditions, differing in terms of mechanical load status. The monitoring of the bearing operation parameters primarily focused on monitoring the velocity and acceleration of vibrations, as well as the operating temperature of the bearing. Thebearingwith lubricant doped by magnetic nanoparticles exhibited reduced vibration velocity and acceleration values both under no load conditions and when subjected to a mechanicalload. The operating temperature slightly increased during testing in the case ofthe bearing with nanoparticles compared to the bearing using the original lubricant.

3

Monitoring of belt floating under controlled belt transmission load

100%

Mascenik J. , Coranic T. , Ruzbarsky J. , Krenicky T.

Mining Machines

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2023

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tom vol. 41, iss. 2

107--118

EN

The paper focuses on experimental monitoring of tightening and floating of the belt at controlled loading of belt gear. In general, the belt gear is referred to as friction gear in practice the primary function of which is to transfer the performance as a consequence of frictional forces occurring between a driven belt pulley, a driving belt pulley and a flexible element. In experimental measurements, the flexible element is represented by a V-belt. The main advantages of the belt gears are peripheral speed, flexible engagement, silent running, vibration absorption and their price. Standard operation of the belt gear requires correct belt tightening which is achieved by movement of a pulley and a tension roll. At the same time, the belt tightening can be achieved by changing the spacing of the shaft axes used in experiments. In the case of belt gears use, specific principles must be observed. The principles include tightening of the belt with particular force which represents, in fact, primary condition of transmission of motion and force. At rest, the tension of both belt parts is identical. Complex analysis of belt gears was followed by experimental measurements on the stands designed for testing and monitoring of belt gears. For the purposes of monitoring of the belt floating there was a system designed which used a high precision sensor to measure distance between the belt and the sensor. At the same time, a device designed to determine the belt tightening was used as well. All measurements were analysed and collected data and facts were used to determine dependencies possible to be applied when the monitored parameters are evaluated. The results of experimental monitoring of the selected parameters at controlled loading of the belt gear can be useful in practice for designing, checking and maintenance operations.

4

Vibrations of the technological head of the abrasive water jet during cutting of structural stee

88%

Krenicky T. , Mascenik J. , Ruzbarsky J. , Coranic T. , Olejarova S.

Mining Machines

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2024

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tom vol. 42, iss. 3

174--181

EN

Vibration measurement is a fundamental aspect of ensuring the optimal and reliable operation of machinery, with implications for production quality, economic efficiency, and safety. The monitoring of machine condition provides essential data for the early detection of damage to machine parts, thereby preventing unanticipated failure modes and disruptions in production. Accordingly, this paper focuses on the measurement and assessment of fundamental vibration parameters, with a particular emphasis on frequency and vibration acceleration amplitude that allows to optimize the production quality assessment. Experimental measurements were conducted on a technological head of production system using abrasive water jet technology (AWJ) with a varied feed rate while cutting two types of structural steel. Based on the results of these measurements, recommendations were formulated regarding suitable and inappropriate combinations of operating parameters, thereby enhancing current knowledge regarding the influence of technological parameters on the amplitudes of vibration acceleration in the operation of production systems with AWJ technology.