As urbanization accelerates and infrastructure renovation demand surges, the need for high-performance, low-noise hydraulic breakers has become increasingly critical for contractors worldwide. Guchuan Machinery Co., Ltd., a leading manufacturer of construction machinery hydraulic breakers since 2010, is proud to present the SB70/GCB210 Silent Box-Type Nitrogen Hydraulic Breaker—a game-changer designed to redefine efficiency, versatility, and environmental compliance in demanding job sites. Engineered for 16-21 ton excavators, this premium attachment combines brute breaking force with ultra-low noise operation, making it the ideal choice for municipal maintenance, building renovation, landscaping, transportation infrastructure projects, and industrial facility upgrades.

The SB70/GCB210 leverages advanced nitrogen-fired technology, a proven superior alternative to traditional hydraulic-only breakers. Here's how it works: High-pressure hydraulic oil from the excavator lifts the piston, while a pre-compressed nitrogen chamber stores energy during the upward stroke. When the piston reaches the optimal position, the nitrogen gas expands rapidly, propelling the piston downward with intensified force to strike the 135mm tool diameter chisel. This hybrid design delivers 3423 Joules of impact energy and an impact rate of 350-500 Bpm—30-50% faster breaking efficiency compared to conventional hydraulic breakers—while minimizing energy waste.

At the heart of the SB70/GCB210's innovation is its fully enclosed box-type housing, engineered to address the critical challenge of noise pollution in urban and residential areas. The soundproof casing absorbs and dampens impact noise, limiting operation to 120 DB—a 34% reduction compared to pneumatic breakers and standard open-type hydraulic breakers. This makes the breaker compliant with strict noise regulations in noise-sensitive zones such as residential neighborhoods, hospitals, schools, and commercial districts.

Guchuan's proprietary automatic variable frequency system sets the SB70/GCB210 apart from competitors. This intelligent technology adjusts the breaker's impact frequency and stroke length in real-time based on material hardness—delivering long, powerful strokes for hard rock and concrete, and shorter, faster strokes for softer materials like asphalt and compacted soil. The result is optimal performance across diverse applications, with no manual adjustments required.

Every component of the SB70/GCB210 is built for durability and performance. The breaker's body is crafted from high-grade 42CrMo steel, a material renowned for its tensile strength and wear resistance, while the chisel features heat-treated alloy steel for maximum impact resistance. The breaker operates within a hydraulic pressure range of 160-180 Bar (setting pressure: 210-230 Bar) and requires an oil flow of 100-150 l/min, compatible with most 16-21 ton excavators from leading brands.

The SB70/GCB210 is engineered to excel in diverse working environments, eliminating the need for multiple attachments.

• Reduced Maintenance: The sealed design, automatic greasing system, and high-quality components minimize maintenance requirements
• Energy Savings: The automatic variable frequency and energy recovery system reduce fuel consumption by up to 15%
• Long Service Life: With a design life exceeding 5,500 operating hours, the breaker offers higher return on investment
• Minimal Downtime: Reliable nitrogen-hydraulic system and durable construction reduce unplanned downtime

• Noise Compliance: Meets global noise standards for urban construction, enabling work in noise-restricted zones
• Vibration Control: Reduced vibration transfer complies with occupational health regulations
• Safety Features: Enclosed box design contains debris, while blank firing protection prevents component damage

The SB70/GCB210 is delivered ready for installation, complete with hoses, mounting brackets, and detailed instructions. It is compatible with all major excavator brands in the 16-21 ton class, eliminating the need for custom modifications. The breaker's compact design (package dimensions: 200cm x 180cm x 160cm) ensures easy transportation and storage, while its 1650 Kg weight optimizes machine stability and operator visibility.