Study On Static Posture Injury Assessment Of Support Worker In Fully Mechanized Excavation Face

In addition to the complicated environment element of high temperature and humidity,insufficient light conditions,and narrow working space,the support workers need to maintain a relatively static working posture for a really long time,which has been proved will make them suffer from considerable load,reduce their operational efficiency,and even cause musculoskeletal disorders(WMSDs)for fatigue accumulation.Therefore,it is necessary to analyze the postures of support workers during static work,assess the risk of injury on various parts of their bodies,and reduce the prevalence of WMSDs.According to the method for Dempster human body segmentation,a simplified three-dimensional multi-stiff body support static working posture model structure is established with reference to the static support working postures after analyzing the influencing factors of postural fatigue injury in the supporting work.And stress on the main body parts such as lower back,shoulder joint,elbow joint and knee joint are analyzed to obtain hydrostatic equations,which can visualize the relationship between the force magnitude and the relevant inclination angle.The human body model of the support worker was set up with JACK Software to simulate three static operating postures of the side support.According to the TAT,the force and strength prediction of each body part under different static working posture are simulated during the side support operation,which is to provide a basis for assessing the risk of musculoskeletal injury in the static operation postures of the support workers,and to reflect the reasonableness of the conclusions on the force analysis.Conclusion shows that standing posture is the best choice to lower the risk of musculoskeletal injury for support workers during the side support operation,while the upper arm should be as close to the body as possible.The bending and squatting operations have a greater impact on the load on the human waist and lower limbs and are prone to injury.For the long duration of the static support operation,the bending and kneeling posture operation should be avoided as much as possible,or make the bending angle of the waist and kneeling angle as small as possible to reduce the load.