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一、前言目前,国内矿井提升机或提升绞车使用的二级制动或等力矩二级制动液压站,在安全制动时,基本上能将提升机的减速度控制在:提升重物时小于或等于5m/s~2,下放重物时小于或等于1.5m/s~2。但是,由于液压站的一级制动力矩一经调整,即为定值。无论提升机处于正、负力何种工况下,亦无改变(提升机提升重物,提升为正力提升,重物下放为负力提升,以下相同)。从而使提升机在安全制动时的一级制动力矩的调整就极为困难,稍有不慎,就可能导致多绳摩擦提升机在安全制动时的减速度超过防滑极限,或造成单绳缠绕式提升机蹬绳事故。
I. Introduction At present, the second-stage brake or equal-torque second-stage brake hydraulic station used by the domestic mine hoist or hoisting winch basically can control the deceleration of the hoisting machine under the condition of safety brake: when lifting heavy objects Less than or equal to 5m / s ~ 2, less than or equal to less than or equal to 1.5m / s ~ 2. However, as the first stage of the hydraulic braking torque is adjusted, it is fixed value. No matter what working condition the hoist is in the positive and negative conditions, there is no change (the hoist lifts the heavy object, elevates the positive lifting, the heavy lifting is the negative lifting, the same below). So that the elevator in the safe braking of the first-class braking torque adjustment is extremely difficult, a little carelessness, it may lead to multi-rope friction hoist deceleration braking safety brake over the limit, or cause a single rope Winding elevator pedal accident.