Saintyol DAWIN Shotcrete robot — Optimizing concrete spraying conditions, redefining wet concrete-spraying performance.
sourceSaintyol DAWIN News Center
publisherJenny
time2026/08/05
- In wet-mix shotcrete operations for tunnels, mines, and slope stabilization, traditional equipment has long struggled with four major pain points: persistently high rebound rates, frequent pipeline blockages, unstable material flow (pulsation), and insufficient pumping power. These issues not only lead to significant raw material waste and costly downtime but also create quality risks such as poor layer density, hollow spots, delamination, and substandard structural strength.
In wet-mix shotcrete operations for tunnels, mines, and slope stabilization, traditional equipment has long struggled with four major pain points: persistently high rebound rates, frequent pipeline blockages, unstable material flow (pulsation), and insufficient pumping power. These issues not only lead to significant raw material waste and costly downtime but also create quality risks such as poor layer density, hollow spots, delamination, and substandard structural strength. Addressing these common industry challenges, Saintyol DAWIN Machinery shotcrete robot has conducted targeted R&D based on actual site conditions—focusing on structural design, fluid dynamics, hydraulic systems, intelligent control, and manufacturing quality—to systematically resolve these issues and achieve superior performance characterized by low rebound, clog prevention, continuous material flow, and powerful, steady pumping.
(I) Targeted optimization of the concrete spraying system to effectively reduce concrete rebound rates. Excessive rebound stems from dispersed material flow, uneven mixing of accelerators, unbalanced air-to-material ratios, and improper impact kinetic energy of aggregates. Moving away from traditional, generic nozzle designs, Saintyol DAWIN shotcrete truck optimized nozzle flow fields through simulation: 1. Novel material-focusing atomizing nozzle design. The internal air-material mixing chamber was redesigned using a multi-stage vortex flow structure; this ensures compressed air, concrete, and accelerator fully blend within the nozzle to form a focused, stable stream, thereby reducing aggregate scattering and splashing. Additionally, the shotcrete robot airflow velocity gradient was optimized to lower the kinetic energy of coarse aggregates upon impact with the rock face, minimizing rebound at the source.
2. Closed-loop, precision accelerator dosing process.
Saintyol DAWIN shotcrete truck equipped with a variable-frequency metering and delivery system, the equipment dynamically adjusts the accelerator dosage based on real-time concrete pumping flow, significantly reducing metering errors. This prevents issues such as localized accelerator deficiency (causing the shotcrete layer to slump) or overdose (leading to a loose surface layer). It ensures rapid initial setting upon contact with the application surface and effective aggregate adhesion, resulting in reduced rebound across both arch sections and sidewalls. 3. Coordinated Control of Boom-End Pose
The concrete spraying machine multi-degree-of-freedom folding boom, combined with a 360° nozzle rotation mechanism, enables the operator to consistently maintain the nozzle perpendicular to the rock surface at the standard spraying distance, thereby reducing rebound losses caused by oblique spraying. Additionally, a biomimetic constant-speed spraying control logic prevents large-scale material sloughing and spikes in rebound caused by inconsistent movement speeds.
(II) End-to-End Optimization of the Conveying System and Multi-Layer Anti-Clogging Architecture
Pipe clogging frequently occurs at the S-tube, elbows, and nozzle, often triggered by material segregation, poor suction, abrupt changes in flow paths, pressure fluctuations, or concrete retention and setting. Saintyol DAWIN wet concrete spraying robot implements dual optimizations covering both flow path structure and control logic: Smooth flow path transitions—optimizing the S-tube's curvature profile and reducing pipeline bend angles to eliminate dead zones where material eddies and accumulation occur; optimizing the hopper feed channel and adding an internal secondary mixing mechanism to inhibit concrete segregation and prevent aggregate clustering or jamming. Widening the feed zone improves suction efficiency, preventing airlocks caused by "dry suction."
2. Intelligent Anti-Clogging Control Mechanism
The shotcrete robot system monitors pumping pressure curves in real-time, issuing early warnings of clogging risks when pressure spikes abnormally. It features a one-touch integrated forward/reverse pumping program that rapidly switches to reverse pumping during pressure anomalies to loosen jammed aggregates. Pipeline layouts are optimized to minimize sharp bends, and wear-resistant elbows with gradual transitions are standard, reducing material frictional resistance.
3. Adaptable Material Conveying Process
Saintyol DAWIN shotcrete robotic truck pumping cylinder diameters and strokes are optimized for standard wet-mix shotcrete aggregate specifications to improve material flowability. This design accommodates fiber-reinforced shotcrete and low-workability mixes, broadening the range of usable construction materials and reducing the probability of on-site clogging.
Through extensive field applications—including highway and railway tunnels, mine roadways, and hydraulic engineering slopes—Saintyol DAWIN wet-mix shotcrete robot rigs have consistently demonstrated their technical advantages, establishing significant competitiveness in controlling construction costs, ensuring support structure quality, and enhancing construction efficiency. Moving forward, Saintyol DAWIN Machinery shotcrete robot will remain focused on addressing the pain points encountered in on-site construction. By continuously iterating upon the fluid, hydraulic, and intelligent control technologies of its wet-spraying equipment, the company aims to provide more stable, cost-effective, and high-quality equipment solutions for concrete wet-spraying support in underground engineering.