Study On Design And Dynamic Characteristic Of Cable Winding Device Of Roof Bolting Machine

In the process of safe and efficient modern coal mining production,rock bolting and anchor cabling support is a fast,safe and economical way of roadway support.As a typical representative of tunnel excavation and support equipment in underground coal mining face,roof bolting machine mainly adopts cable power supply mode.However,in practical application,due to the large transmission power and long distance of the cable line,the roof bolter runs forward and backward.It is extremely inconvenient and seriously affects the efficiency of roadway support.Therefore,it is of great significance to design and study the cable winding device matched with the roof bolting machine to realize the automatic retraction and release of the cable.In this thesis,starting from the structural function of the cable winding device of the roof bolting machine and the actual use requirements of the cable arranged mechanism,a cable winding device of the roof bolting machine was designed,included the base bracket,the reel device,the cable arranged mechanism,etc.The overall structure scheme of the cable winded device,the structural design of the automatic cable arrangement mechanism and the theoretical calculation of the hydraulic system were analyzed.The three-dimensional structural model of the cable winding device was established using Solidworks.Using ANSYS software,the static analysis on the multi-layer winding drum was perform,and the complete model of the rigid system of the cable winded device for the roof bolting machine was constructed.Secondly,according to the characteristics of various modeling methods of rope-like flexible bodies such as cables,combined with the structural characteristics of mining cables.A cable model was established based on ADAMS macro language to realize the winding and contact collision process between cables and reels,guides and other components.Based on the cable tension attenuation theory,the ADAMS software was used to carry out dynamic simulation analysis of the winding and unwinding process of the cable winding device under different working conditions.The results show that: in the process of reeling,the changes of drag force,reel speed and cable material parameters have a great influence on the dynamic tension of the cable micro-segment.And the maximum dynamic tension of the cable is smaller than its maximum static tension.The thread pitch and chain pitch have a great influence on the uniformity of the cable arrangement.Under the 45 mm thread pitch and the chain pitch P=19.1,the cable arrangement requirement of the cable diameter of 34.2mm is satisfied.During the unwinding process,the unwinding speed has a great influence on the dynamic tension change of the micro-segment cable.The matching of the vehicle speed and the reel speed will reduce the influence of longitudinal vibration on the cable rotation effect.The peak value of the contact force of the reel appears at the moment of the acceleration of the take-up and the detachment of the unwinding cable and the reel.And they all show periodic changes,which are positively related to the change of the dynamic tension of the cable.The drag force and the speed of the reel have little effect on the contact force,and the contact force is large during the winding process,which is more likely to cause wear of reel.Finally,using the ADAMS modal flexible body modeling technology combined with Hypermesh,a rigid-flexible coupling model of the cage and ball flexible cable arranging system was established.The cage deformation and the stress distribution area during the cable arranging process were studied,and the first six modal vibration shapes of the cage were obtained.The dynamic characteristics changes of the cable arrangement system under different parameters and the stress changes of the cage and balls under specific working conditions were studied and analyzed.The results show that the input rotational speed and damping coefficient will have a significant impact on the dynamic performance of the cable arrangement system.With the increase of rotational speed,the angular acceleration and the contact force both increase.And the difference of the damping coefficient has a certain influence on the acceleration of the cable arrangement system,the greater the damping,the greater the system capacity dissipation,the faster its acceleration amplitude decays.Maximum stress area on the cage occurs at the right end of the arc groove where the cage contacts the balls,and the average stress and maximum stress are 18.48 MPa and 39.65 MPa,the stress on each ball is different,and the maximum stress is 18.07 MPa.The stress on the cage and balls is within the allowable range of their materials,which ensures that the cable arrangement system works properly.