technology

Unit 1 new Komatsu PC220-3 excavator, only more than 2 months on the machine's turntable tooth ring and drive gear were broken.

Because the machine also appeared more other aspects of the fault, had to be discontinued.

Later, when the machine was overhauled, the circuit on the machine was re-connected, but the machine worked on the site for only about 2 months, and the rotary brake control circuit had a "break" fault, and the people on the site thought that it could barely work, so it failed to eliminate the fault in time, and the machine continued to work for a long time with "disease".

The rotary brake on the machine is always in the braking state, but in this state the rotary table can also start and turn, but the speed of start and turn is much slower (equivalent to the driving force of the driving gear is greatly reduced).

It is analyzed that the gear and gear ring will not be damaged at this time, only at the moment of stopping rotation, because the inertia force of the turntable is very large, and the driving gear is braking (there is no buffer process like hydraulic braking), so that the inertia force of the turntable all acts on the gear ring and drive gear, the gear teeth can not withstand the huge impact force and be broken;

The gear ring and drive gear of the new machine are damaged, which is also caused by the "break" of the control circuit of the rotary brake.

It can be seen from the above failure cases that the circuit of the temporary rotary brake fails, and it must be eliminated in time, otherwise it will cause serious consequences.