Mining Machinery Front Shovel Excavator and Its Pushing Mechanism Loss of Control Protection Method and Device

Abstract

The invention discloses a mining mechanical face shovel type excavator and a bulldozing mechanism out-of-control protection method and a device thereof. The bulldozing mechanism out-of-control protection method comprises the steps of: acquiring a pulse number of an absolute value encoder mounted on a bulldozing speed reducer transmission shaft 2 of a bulldozing mechanism, and acquiring a first rotating speed of a bulldozing motor; calculating a second rotating speed of the transmission shaft 2; comparing the second rotating speed with the first rotating speed to judge if a bulldozing belt slips and if the bulldozing mechanism is out of control; and controlling a bulldozing brake to brake if the bulldozing mechanism is out of control. The bulldozing mechanism out-of-control protection method improves the safety of the mining mechanical face shovel type excavator.

Description

technical field [0001] The present invention relates to the technical field of mining machinery, in particular to a method for protecting a pushing mechanism out of control of a mining machinery front shovel excavator, a device for protecting it from being out of control for a pushing mechanism, and a mining machine equipped with the device for protecting it against being out of control for a pushing mechanism Front shovel excavator. Background technique [0002] The mining machinery front shovel excavator is a kind of mechanical excavation equipment driven by electric motor. It consists of four independent and closely connected working processes. These four working processes are excavation, turning, unloading and walking. Such as figure 1 As shown, excavation: the work of mining excavator bucket 2 to dig materials, which is completed by two actions of lifting and pushing. The pushing mechanism 1 makes the bucket 2 move in a straight line to ensure that the bucket 2 is inse...

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Problems solved by technology

[0003] The transmission chain of the pushing mechanism is as follows: figure 2 As shown, the push motor 6 is connected to the input shaft of the reducer through the belt 5. The characteristics of the belt transmission are: the transmission is stable and noiseless, it can buffer and absorb vibration. In case of impact overload, the belt will slip on the pulley , can prevent damage to weak parts and play a role in safety protection, but if the belt slips frequently due to reasons such as improper belt tension adjustment, the wear will increase, and in severe cases, the life of the belt will be affected. Once the belt breaks, the pushing mechanism will be damaged. Out of control due to loss of electric braking. The existing WK ​​series frequency conversion excavators do not have belt slipping and pushing out of control detection functions. If the pushing mechanism fails, real-time protection cannot be achieved, which seriously affects the safe operation of the excavator.

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