The looseness of the anchor bolt of the electric shovel travel reducer causes the deceleration box to be unstable, which causes the gear to tilt, causing the shaft gear to be offset from the axis of the traveling large shaft, thereby causing partial wear of the steel sleeve and the shaft gear tooth surface.

Due to insufficient cleaning of the contact surface of the gearbox, there are factors such as sand dust or deformation of the upper cover of the gearbox, which causes point contact or gap between the two pairs of ports. The bolt tightening torque is uneven or does not reach the standard torque during maintenance and assembly. Loose fracture phenomenon is easily generated during operation, which destroys the constraint relationship between the copper sleeve and the shaft gear, which causes the shaft gear and the copper sleeve to generate radial runout during operation.

The track shoes must be properly tight. If the load is too loose, the load on the traveling motor and the transmission mechanism will be too large, so that the shaft gear receives a large impact force and is prone to breakage.

The shape and force of the gear in the running mechanism are relatively complicated, so the mechanical properties of the gear material are very high. The greater the content of sulfur and phosphorus in the metal material, the worse the plasticity and toughness of the steel, the worse the impact resistance, and the more brittle the steel, especially at low temperatures.

There are many reasons for the gear breakage. It should be comprehensively analyzed from the aspects of design, processing, use, maintenance and operation, and take measures to reduce or prevent the occurrence of mechanical equipment failure, ensure the normal operation of the equipment, and create better social benefits for the enterprise. And economic benefits.

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