Research On BH38/2×400Plough’s Plow

Carbide-tipped planer tools are widely used domestically and abroad to attainhigh coal-mining efficiency, high rate of coal blocks and lower consumption ofplaner tools for coal ploughs. To resist the impact of harsh environmentalconditions during coal ploughing, a planer tool generally possesses qualities such asgood strength and high wearing resistance. This paper presents an in-depththeoretical analysis and experimental research focusing on the issues in the courseof planer tool usage including low efficiency of coal ploughing, easy detachment ofcarbide tip and low wearing resistance. Using carbide-tipped block planer toolscommonly used in China as the object, the static mechanic analysis of planer toolsas well as the structural optimization were conducted, whereas an improvementmeasure was proposed, the feasibility and effectiveness of which were verified byplatform test and underground test.This paper defines the scope of use of coal ploughs in accordance withthe existing technology, and studies the planer tool arrangement within the scope ofuse, particularly in respect of hard coal, unfavorable joint development and stick ycoal substance.A three-dimensional finite model of planer tool was established, with thestrength analysis and deformation analysis completed under the maximum load.The structural optimization of planer tools was conducted through strengthanalysis, while the planner tool after structural optimization was verified throughcoal ploughing simulation test. The test results showed that the strength of theoptimized planner tool satisfied the usage requirement.Considering the impact of pressure reacceptance during coal ploughing on thebrazing of carbide-tipped blade and body, the existing brazing process was analyzed,and the brazing gap, surface preparation, heating temperature, temperature-holdingtime and other treatment processes were optimized. A shear test was conducted onthe brazing gap, where the verification results showed that the brazing techniqueproposed in this paper can effectively prevent the detachment of the carbide tip.Targeting at the low wearing resistance of the body of a planer tool due to the destruction of the original heat treatment during brazing process, the optimized heattreatment passed the platform test and underground usage test, which verified theoptimization resultsGiven the definite engineering research background, this paper is able toprovide reference and basis for the design and improvement of planer tools.