The characteristic analysis and experimental research of hydraulic speeding soft brake for downward belt conveyor

According to the characteristic of the coal mine downward belt conveyor,the hydraulic speeding soft brake was studied out to achieve the safety brake of downward belt conveyor and the characteristic and working mechanism of the braking system was analyzed.Then,the test system on dynamic test of the braking system was designed and simulation test of downward belt conveyor in the normal brake,over-speed protection braking,low speed braking,sudden loss of power braking and frequent braking conditions was made.From the test results,based on constant deceleration,high pressure,no friction pair,the hydraulic speeding soft brake can achieve no friction safe braking of downward belt conveyor and can maintain the braking deceleration constant during the braking process.Also,the hydraulic speeding soft brake reduces the impact force of the braking process on the conveyor and can improve the life of the equipment.Meanwhile,the approximate zero-damping circuit of non-braking conditions can greatly reduce the heat of the system in the non-braking condition and can also ensure reliable application of the hydraulic speeding soft brake.