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颚式破碎机3种过载保护措施对比`
网址:http://www.    发布时间:2018-09-20
颚式破碎机工作环境恶劣,工作负荷较大,经常会因为入料不均或较硬的不可破碎物进入破碎腔而出现突然的大幅度超载险情。因此颚破都有过载保护装置。
Jaw crusher working environment is bad, the work load is large, often due to uneven feeding or hard unbreakable material into the crushing chamber and sudden large overload danger. Therefore, there are overload protection devices for jaw breaks.
1、肘板折断法
1. Elbow plate breaking method.
设定肘板低强度易折断点。即在破碎机出现过载时,肘板应力灵敏区因应力急剧上升到极限值而自行折断,切断动力传递,防止机器损伤。
Set elbow plate low strength and easy breaking point. That is, when the crusher overload occurs, the stress sensitive zone of the elbow plate breaks itself because the stress rises sharply to the limit value, cutting off the power transmission and preventing the damage of the machine.
由于肘板(一般为铸铁)的机械性能波动性较大及受计算精度的限制,无法精确定量控制折断点,有时过载得不到保护。
The breaking point of the elbow plate (usually cast iron) can not be controlled accurately and quantitatively due to the great fluctuation of mechanical properties and the limitation of calculation accuracy, and sometimes overload can not be protected.
况且,即使过载时得到了保护,因破碎机处于事故状态,在清理、拆装和换件前设备是不能运行的,流程中断延误生产。
Moreover, even if the overload is protected, the crusher is in an accident state, and the equipment can not run before cleaning, disassembly and replacement, and the process is interrupted and delayed production.
移动碎石机租赁
2、飞轮限矩保护
2. Flywheel limited torque protection
采用弹簧摩擦离合器、液压摩擦离合器或设置安全销等。此类方法简摆式颚式破碎机上应用较多。
Spring friction clutch, hydraulic friction clutch or safety pin are adopted. This method is widely applied to the simple pendulum jaw crusher.
摩擦离合器,既要保证正常工作力矩的传递,又要使传递的力矩不超过允许值。当破碎腔落入料障时,机器过载,达到临界转矩,飞轮在轴上自由滑动,起到保护主要零部件的作用。
Friction clutch, not only to ensure the transmission of normal working torque, but also to make the transmission of torque does not exceed the allowable value. When the crushing chamber falls into the material barrier, the machine is overloaded to reach the critical torque, and the flywheel slides freely on the shaft to protect the main components.
但由于离合器摩擦因数受外界条件(如温度等)影响较大,使其工作的可靠性受到限制,且过载时,仍需人为清障、停机修理,系统恢复比较麻烦。
However, the clutch friction factor is greatly affected by external conditions (such as temperature) so that the reliability of its work is limited, and overload, still need artificial removal, shutdown repair, system recovery is more troublesome.
3、液压保护
3, hydraulic protection
由于上述两种过载保护方法均存在保护不可靠和事故状态下需停机处理等问题。因此,安全可靠的液压保护装置应用更广。
The above two overload protection methods have some problems, such as unreliable protection and shutdown under accident condition. Therefore, a safe and reliable hydraulic protection device is applied widely.
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