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Rope shovel dipper from Cat designed for oil sands applications

Caterpillar dipper for the 7495 HF electric rope shovel.
Caterpillar dipper for the 7495 HF electric rope shovel.

Caterpillar's new dipper for the 7495 HF electric rope shovel is a patent-pending design aimed at improving performance without increasing demands on hoist and crowd capabilities. Targeted directly at hard digging work in oil sands applications, the new dipper's improved shimming and inserts are expected to improve uptime by as much as 0.25 percent, offering production gains.

The new design optimizes lip cutting angle, resulting in significantly reduced heel wear. Improving stiffness and dig performance, the ground engagement tools are pitched at an upward angle that results in less bending force and even tooth wear top to bottom.

Lighter than the current 45.9 cubic metre (60 cubic hard) latched dipper by about seven percent, the new design adds more available cutting force for more consistent fill factors and increased performance in difficult digging conditions. Engineers used Finite Element Analysis (FEA) and virtual validation tools to reduce weight and cut stress to the machine, while adding life and reliability for key front end components.

The dipper features a new vertical latch system that delivers improved system performance and lower part maintenance, reducing overall operating costs. Rather than sliding, the latch's tapered-end design lifts the insert surfaces away from each other. The design extends wear life while reducing service time, contributing to improved uptime. The latchbar guide plate features a quick-change design

Optimized linkage on the new single wet-disk snubber reduces the rotational kinetic energy of the door by more than 40 percent on closing and 75 percent during opening, increasing service life.

More than 300 dipper shapes and configurations were tested using Cat proprietary software, running through 900 simulations to determine that the new dipper geometry allows customers to achieve better penetration and fills per pass.

Company info

100 North East Adams Street
Peoria, IL
US, 61629


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