study on roadheader cutting load at different properties
This paper uses the method of numerical simulation of cutting process of cutting pick and cutting head and gets the cutting load rule at different properties of coal and rock. Numerical simulation method can take an integrated consideration of the characteristics of coal and rock to the impact of the cutting process, which greatly improves the cutting test results.
important factor for successful roadheader application and generally deals with machine selection, production rate and bit consumption. Among many different parameters, brittleness is also one of the material properties related to breakage characteristics and can be used as a cuttability parameter from a mechanical excavation point of view. CUTTING PERFORMANCE ASSESSMENT OF A MEDIUM cutting tests. Some rock properties such as uniaxial compressive strength, tensile strength, Cone Indenter hardness, Shore hardness, Schmidt hammer rebound Keywords:medium-weight roadheader, performance prediction, cutting specific energy, instantaneous cutting rate v. ÖZ patience during this study.
Oct 05, 2011 · That was to say, the cutting load of the same soft-rock was set as a benchmark, and the difference of the cutting load of other rock seams was used to show the change rules of cutting load. 3.1 Hard-soft-hard rock seams To research the load characteristics when only the HCM top or bottom cutting different rocks and the HCM top and bottom Cutting - Idioms by The Free DictionaryDefinition of cutting in the Idioms Dictionary. cutting phrase. What does cutting eion mean? Study on Roadheader cutting load at different properties of coal and rock. AE signals during laser cutting of different steel sheet thicknesses.
Synonyms for cutting in Free Thesaurus. Antonyms for cutting. 70 synonyms for cutting:clipping, extract, excerpt, piece, hurtful, wounding, severe, acid, bitter Effect of cutting angle on the performance of the head of Jun 10, 2021 · The cutting head is a key component of a roadheaders cutting function, and its design level directly determines the performance of the whole machine to a certain extent. Taking the installation angle of the pick-shaped cutter on the head of the roadheader as a research object, a conversion relationship model between the mounting angle of the cutter and the angle of the cutting function was
Jan 01, 2018 · 2.2. Different Types of Waterjet/Pick Combinations for the Cutting Head. Based on the general cutting head used with a roadheader [27-29], 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 Experimental and Numerical Studies on Rock Cutting with
- AbstractIntroductionMethodsResults, Analysis, and DiscussionConclusionConflicts of InterestAcknowledgmentsIn the rock cutting process, conical pick wear is often encountered. In order to restrain this condition, a saw blades and conical pick combined cutting method was put forward. Saw blades were employed to slit the rock for increasing the free surface, and then the conical pick was used to break the rock. To research the cutting performance of the new cutting method, the corresponding experimental device and a three-dimensional finite element model are established. In order to obtain crack propagation and Experimental and numerical investigation of roadheader for Mar 31, 2020 · The purpose of this study is to investigate the dynamic characteristics of a roadheader for breaking rocks containing different numbers and sizes of predrill holes. A series of experiments was performed to quantitatively measure the cutting torque, thrust force, and specific energy during the cutting of a cutterhead.
Sep 28, 2020 · The process of cutting under different cutting velocities is similar to that set in Sect. 4.1 and will not be described again here. The influence of advancing velocity on the cutting load, cutting specific energy consumption and average cutting force on picks involved in cutting are illustrated in Fig. 10. As advancing velocity increases, the cutting resistance force and cutting torque increase linearly, the cutting specific energy consumption decreases and the average cutting JMSE Free Full-Text Mechanical Tests and Numerical Hence, it is of great significance to accurately study the cutting and breaking mechanism under high confining pressure by the corresponding properties of SMS through mechanical properties tests. Additionally, some basic mechanical parameters in the tests, such as Poissons ratio and elastic modulus, need to be obtained.
The following conclusions can be drawn from the results obtained in this study. The influence of different motion parameters for load variation was obtained by simulating the cutting head load of roadheader. The load of cutting head decreases with the increase of Modelling and response analysis of multibody large-scale Apr 19, 2021 · Focused on the vertical cutting condition, the coupling dynamical model of position and attitude of the body is established based on Lagrange equation. Combined with the calculated cutting load, the dynamical model is solved through Simulink simulation method, and the solving results are analysed under different influence factors. Consequently, the response regularities of position and attitude of the body under influence of different
To investigate the mechanical behavior and load torque of the cutting head in the rock fragmentation process, a numerical model was developed based on fracture mechanics and finite element method. And then, rock fragmentation and factors influencing the force of cutting head were investigated. The good agreement of variation characteristics of cutting torque between experimental results and Performance evaluation of bolter miner cutting head by uipment, like a shearer or a roadheader, a bolter miner cutting head has no helical . vane. And its difference in structure leads to a significant difference in mechanical properties between the cutting head and the helical drum (Ma, 2017; Gao et al., 2012). Owing to the short development time of a bolter miner (Vierhaus and
calculate the cutting load by finite element simulation method in this paper. 2.2 Finite . element simulation method. In order to get the cutting load during the roadheader cutting process, we take finite element simulation by using ANSYS/LS-DYNA. The simulation process mainly includes the establishment of 3D (three dimensional) Roadheader A comprehensive review - ScienceDirectJan 01, 2020 · Cheluszka et al. (2017) conducted studies on the dynamic loading cutting condition of the transverse cutting head and developed a correlation between load and energy, including angular speed of cutting to regulate speed by adding an inverter drive system with changing supply voltage frequency of an asynchronous motor.
We are not allowed to display external PDFs yet. You will be redirected to the full text document in the repository in a few seconds, if not click here.click here. miag.agh.edu.plof rocks with different compressive strengths. The regulation properties obtained in this way show the possibility of reducing dynamic loads of the roadheader through the proper control of cutting process parameters, including the angular speed of the cutting heads. By equipping the roadheader with a cutting head inverter drive system, it is pos-
The mechanism of cutting process of roadheader with cutting head was researched, and the influences of properties of coal and rock on cutting load were deeply analyzed. Aimed at the defects of traditional calculation method of cutting load on fully eing the complex cutting process of cutting head, the method of finite element simulation