Effects of circumferential pick spacing on boom type roadheader cutting head performance

Eyyuboglu, E. Mustafa; Bölükbaşı, Naci

doi:10.1016/j.tust.2005.02.002

Cited by 38 publications

(20 citation statements)

References 4 publications

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“…Based on the general cutting head used with a roadheader [27][28][29], three waterjet-assisted cutting heads were developed using different waterjet/pick combinations (as shown in Figure 2): in cutting head I, the waterjet nozzle is integrated with the conical pick, as shown in Figure 2(a), and the direction of the waterjet velocity is parallel to the axis of the conical pick; in cutting head II, the nozzle is separate from the conical pick and ahead of the conical pick, as shown in Figure 2(b), and there is a distance between the waterjet impact point and the tip of the conical pick; and in cutting head III, the waterjet/pick combination is similar to cutting head II, but the distance between the waterjet impact point and the tip of the conical pick is almost equal to zero, as shown in Figure 2(c).…”

Section: Different Types Of Waterjet/pickmentioning

confidence: 99%

Experimental Research on the Specific Energy Consumption of Rock Breakage Using Different Waterjet‐Assisted Cutting Heads

Jiang

Meng

2018

Advances in Materials Science and Engineering

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To investigate the specific energy consumption (SE) of rock breakage by cutting heads assisted by different types of waterjet and to identify optimal waterjet parameters and assistance types, rock cutting with and without waterjets was carried on a rock fragmentation test bed. SE is a comprehensive evaluation index and was developed according to the applied load on cutting head, and the SE under different cutting conditions was compared and analyzed. e results show that the SE of rock breakage without waterjet assistance increased with the increasing of rock compressive strength (R CS ) but that the limited drilling depth decreased.e effect of the waterjet pressure on the SE of rock breakage by the cutting head I was marked, and SE decreased by 30∼40% when the ratio between R CS and waterjet pressure was less than 1. However, the function of the waterjet assistance was poor; therefore, a ratio of 1 could be used to distinguish the rock breakage effect of cutting head I. For cutting head II, the rock damage from the waterjet impact was limited due to the large waterjet standoff distance; thus the rock breakage performance of cutting head II was also limited. e waterjet impacting at the tip of the conical pick using cutting head III could enter into the cracks caused by the mechanical pick and fracture the rock. erefore, the rock breakage performance of cutting head III was better than that of cutting head II.

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Section: Different Types Of Waterjet/pickmentioning

confidence: 99%

Experimental Research on the Specific Energy Consumption of Rock Breakage Using Different Waterjet‐Assisted Cutting Heads

Jiang

Meng

2018

Advances in Materials Science and Engineering

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“…In-situ experiments with this instrumented bit were conducted in three mines to obtain the coal cutting forces. Eyyuboglu and Bolukbasi [12] investigated the effects of equal and unequal circumferential pick spacing on the performance of road-headers by conducting in-situ experiments in Park Cayirhan Coal Mine in Turkey. Through in-situ experiment is the most reliable method to obtain the cutting forces, it is costly and difficult, and there is no appropriate opportunity to conduct in-situ experiments in mines for most researchers.…”

Section: Introductionmentioning

confidence: 99%

A study on drum cutting properties with full-scale experiments and numerical simulations

Wang

et al. 2018

Measurement

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In order to investigate the properties of cutting loads on shearer drum, a series of full-scale shearer drum cutting tests were conducted in the National Energy Coal Mining Machinery Equipment Research and Design Center of China. The pick forces and the torque acting on the drum were measured and recorded under different cutting conditions by the strain sensors that were embedded in the cutting picks. Besides, an attempt was made to simulate the shearer drum cutting process. For this purpose, a computer program named Particle Flow Code in three dimensions (PFC3D) based on discrete element method (DEM) was used. The rock sample was models by graded particle assemblies and the micro-properties were calibrated by modeling the uniaxial compressive strength tests. The cutting process for the front and back drums with different traction speeds were simulated with this model. The torque of drums and forces of each pick were obtained during the simulation. Reasonable agreement and significant correlations were found between experiment and numerical simulation in terms of cutting forces of picks and the mean torque of the drums. The specific energy increased with the increase of traction speed in experiments, which was reproduced well in numerical simulation. Moreover, according to the analysis in frequency domain, the vibration of drum torque consists of components with multiple frequencies below 50 Hz, which is observed in both experiment and simulation. Therefore, numerical simulation by PFC3D is an easier, faster and reasonable method in the prediction of drum cutting load and design of shearer drum.

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“…Li Xiaohuo analyzed the movement of a longitudinal cutting head in a road header and found the path of a cutting line in space had an important impact on the performance of a road header (Li, 1998). Effects of equal and unequal circumferential pick spacing on a road header machine were researched by E. Mustafa Eyyuboglu, et al Through a series of experiments, they drew the conclusion that there were no remarkable differences between the two types of cutting heads (Eyyuboglu and Bolukbasi, 2005). H. Ergin et al investigated the detail effect of design parameters (i.e.…”

Section: Introductionmentioning

confidence: 99%

Parametric Modeling of Cutting Head in A Road Header Machine based on Nurbs in OpenGL

2016

Rev. Téc. Ing. Univ. Zulia

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The design of a cutting head is significant to the performance of a road header machine. To improve design efficiency, based on theories of computer graphics, a design method for cutting head with cutting lines and cutting tools by Non-uniform rational B-spline (Nurbs) is achieved in OpenGL. Formulas of a cutting line are derived. The minimum distance from a tool tip to head surface is calculated in order to exactly determine the location of a foam nozzle. Arrangements of cutting tools are performed. Arrangement and expansion graphs with corresponding location and angle parameters are obtained in order to predict the cutting performance of a cutting head. Researches in this paper offer basis and foundation for the design of a cutting head in a longitudinal road header machine.

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Effects of circumferential pick spacing on boom type roadheader cutting head performance

Cited by 38 publications

References 4 publications

Experimental Research on the Specific Energy Consumption of Rock Breakage Using Different Waterjet‐Assisted Cutting Heads

Experimental Research on the Specific Energy Consumption of Rock Breakage Using Different Waterjet‐Assisted Cutting Heads

A study on drum cutting properties with full-scale experiments and numerical simulations

Parametric Modeling of Cutting Head in A Road Header Machine based on Nurbs in OpenGL

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