What is an excavator tunnel arm
The tunnel arm generally refers to a working device that works in a narrow space. It is mostly used in tunnels, so it is called a tunnel arm. In Hong Kong, it is called a dungeon arm or a fireplace arm. In Taiwan, it is called a naughty leopard. There are various names, but in China Popularly known as tunnel arms.
Suitable for tunnels or other narrow working conditions. The tunnel arm can carry a breaker that is one model larger than the standard arm, increasing work efficiency. The forearm is filled with iron sand to increase its weight, which can suppress the breaker hammer more forcefully and reduce rebound. The bucket arm cylinder is placed underneath to reduce cylinder damage and failure.
Standard Configuration
1 set boom and arm, stick cylinder, bucket cylinder, linkage assembly, 7 pins, 6 high‑pressure hoses, 1 set breaker hydraulic lines, 2 stop valves.
Advantages
1. Long-lasting Durability
For our tunnel booms designed for excavators with a capacity of 30 tons or more, we utilize steel plates with a thickness of 20–30 mm. This design ensures a service life that far exceeds that of the original equipment manufacturer’s (OEM) booms.
2. Operational Convenience and Innovative Design
The intermediate cylinder of the tunnel boom is positioned underneath, ensuring an unobstructed workspace and greater ease of operation. Additionally, we have incorporated protective covers for the bucket cylinders to prevent damage from falling debris.
3. Enhanced Efficiency
The tunnel dipper arm is filled with internal material, which helps dampen the recoil of the hydraulic breaker and improves overall impact efficiency.
4. Product Robustness
We employ a three-layer welding process to ensure superior weld quality and overall product integrity. Alloy steel bushings are also available, tailored to specific customer requirements.
5. High-Precision Seamless Piping
All hydraulic lines consist of 1.2-inch thick-walled seamless piping, which significantly reduces the risk of pipe bursts. We use high-quality, original-specification shut-off valves for an extended service life, and we utilize premium-grade Ningbo-manufactured fittings for all welded connections.
6. Reduced Failure Rate
We use oversized bucket cylinders to minimize the most common issue encountered with tunnel booms: the bending of the piston rod. For instance, our units for 20-ton excavators feature 30-ton class bucket cylinders; those for 30-ton excavators use 45-ton class cylinders; and those for 45-ton excavators are equipped with 65-ton class cylinders—all designed to lower the frequency of mechanical failures.
Working Condition
Pictures Display
ZHONGHE Product Advantages
1. Fashionable style
2.Professional Team
3.Quality control
4.Moderate price
5.CE certification
6.Promptly answer
7.Patented technology
8.Enrich production experience
ZHONGHE triple quality control system
1.The first system is the technical design drawing review mechanism.
2.The second system is the semi-finished product review mechanism.(each process has a detection testing for the previous process)
3.The third system is the finished product testing.(Before painting, the overall inspection is carried out to check whether the design size matches the welding size, and whether the installation size meets the design requirement.)
To sum up, every single ZHONGHE product has been passed the above three-stage inspection system to ensure that is qualified before shipping.
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