195-12-21110 BOOY，OUTER
The outer arm of a bulldozer, also known as the "bulldozer arm" or "boom", is a key load-bearing component that connects the body of the bulldozer to working devices such as shovels and soil looseners. It mainly consists of an arm structure, hydraulic cylinders, connecting hinge points, and reinforcing ribs. Its core function is to achieve the lifting, tilting, and flipping of the working device through hydraulic drive, thereby completing tasks such as earthwork pushing and site leveling. The outer arm needs to withstand huge bending moments and impact loads, so it is usually welded with high-strength low-alloy steel (such as Q345B), and the arm section is mostly box shaped or I-shaped to enhance rigidity.
Application scenarios of the outer arm
Choose the plan that suits you best.
Core operations of earthwork engineering
Site leveling: By controlling the lifting and lowering of the shovel through the outer arm, the elevation of a large area of the site can be adjusted (with an accuracy of ± 5cm), such as for building foundations and airport runway construction.
Earthwork pushing: The outer arm pushes the shovel to transfer soil and sand from low to high, with a single pushing volume of 8-15m ³ (depending on the tonnage of the model).
Backfilling of foundation pit: The articulated outer arm, combined with the tilting function of the shovel, can accurately fill the soil into the foundation pit and compact it layer by layer.
Adaptive operations for special working conditions
Mining stripping: The outer arm with a soil loosening device first crushes the hard rock on the surface of the ore layer, and then pushes the stripped material to the waste dump through a shovel, suitable for open-pit coal mining and metal mining.
Wetland/Swamp Operations: Lightweight outer arm design combined with wide track bulldozers (such as TSY220) to reduce ground pressure (0.04-0.13MPa) and avoid equipment sinking.
Infrastructure engineering assistance: In high-speed railway and bridge construction, the outer arm is used for roadbed foundation treatment, filling material paving, and filling embankments horizontally along the centerline of the road.
Expansion of Extreme Environment Operations
High altitude/high temperature environment: The outer arm hydraulic system adopts low/high temperature resistant seals (-40 ℃ to+80 ℃), suitable for high-altitude bulldozers (such as TYG220 type).
Environmental sanitation/emergency operations: The front end of the outer arm can be replaced with attachments such as grab buckets and breaking hammers for post disaster cleaning and construction waste transportation.
Adjust the angle and range of the homework
The outer arm of some bulldozers is designed with a lateral swing function (in conjunction with a tilt cylinder), which can drive the shovel to tilt left and right, adapting to the needs of slope pushing or single-sided unloading; By extending or rotating the outer arm (for a few models), the operating radius can be expanded, improving operational flexibility.
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