Design And Research Of Recovery Equipment For Mining Anchor

With the flourishing development of anchor bolting technology at home and abroad, anchor supporting has become the main supporting in mine roadway and has increased the safety of down-hole operation. But due to the suspension function of anchor, the tunnel roof behind the working face can not fall down with the roof-caving of mining surface, resulting in a large area of roof hanging at the back of the working surface. The roof hanging forms the dead space of ventilation, easily causing gas accumulation, which poses a serious threat to the safety of working surface. Besides, when the shearer worked to the edge of roadway mining area, the end anchor may affect the normal operation of shearer and cause the damage of cutting head, affecting the production of coal. From these considerations, it is necessary to solve the problem of anchor recovery.Since the existing equipments for anchor recovery had many shortcomings in operation or safety, in this study, the equipment of retreating mining anchor was analyzed and studied from theory, structure design and finite element simulation, mainly including these following contents:First, cut-breaking mechanism of rusted nuts and working principle on the electric control part of breaking cutters were discussed. Based on these theories, automatically controllable breaking cutter for rusted nuts was designed, including designs of its mechanical part and electric control part. The design of mechanical part included designs of both breaking cutter for rusted nuts and manual hydraulic pump. The design of electric control part included designs of circuit system, solenoid valve and piezoresistive sensor.Second, anchor removing equipments were designed based on the theoretical research on rock breaking. The design of anchor removing equipments included designs of its working parts and the drill for anchor removing, to remove the anchor without nut from the coal rock.Finally, simulation analysis of the working process of anchor retreating equipments'working parts under the maximum power and rated power was made using finite element analysis software. The aberration nephogram and stress distribution nephogram of each components of retreating equipments were got from the simulation of ANSYS finite element. The results showed that the finite element simulation not only verified the previous theoretical conclusions, but also showed out those that the theory could not derive or prove.Achievements had achieved on the research of anchor recycling equipments through those studies above. Automatically controllable breaking cutter for rusted nuts has got the china national practical new-type patent. Compared to the ordinary breaking cutter for rusted nuts, automatically controllable breaking cutter had higher breaking precision because of adding an electronic control part. The ANSYS finite element simulation of retreating equipments'components provides certain reference for the subsequent structural optimization design.