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Advantages of Fully Automatic Wet-Spray Trolley Composite Pipelines
Release time:
2026-08-26
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Summary:
In the conveying system of wet‑spraying rigs, the concrete slurry contains high‑hardness sand and aggregate, which, under high‑pressure impact, cause severe abrasive wear and repeated scouring on the inner walls of the pipelines—this is the primary cause of pipeline wear and failure. The composite pipelines used in fully automatic wet‑spraying rigs integrate steel tubing with a high‑performance polymer wear‑resistant lining, combining the strength and load‑bearing capacity of steel with the wear resistance and friction‑reduction benefits of the polymer liner. Their performance advantages are primarily manifested in the following four aspects.
1. Extremely high wear resistance, significantly extending the service life of wear parts.
The core advantage of composite pipelines lies in the exceptional wear resistance of their inner lining. Take steel‑lined ultra‑high‑molecular‑weight polyethylene (UPE) composite pipes as an example: the UPE’s abrasion rate is only 21 (measured by the Sinopec method, with a reference value of 100 for steel pipe abrasion), meaning its wear resistance is five times that of ordinary steel pipe. Under conditions of severe corrosion and high abrasion, the service life of UPE can be four to six times longer than that of steel pipe. More precise tests further show that UPE’s wear resistance is seven times that of carbon steel and ten times that of stainless steel, while the wear of its inner lining can be reduced by more than 80% compared with conventional rubber hoses. Steel‑lined polyurethane composite pipes, on the other hand, leverage the elastic properties of polyurethane: when subjected to fluid impact, they deform elastically and return to their original shape once the external force is removed, thereby mitigating direct wear on the pipe’s inner wall through a “soft‑overcomes‑hard” mechanism. Their wear‑resistant service life is several to dozens of times that of steel pipe.
In engineering practice, the wear‑resistance advantages of composite pipelines have been thoroughly validated. Zoomlion’s “Pioneer” series ZG45 wet‑spraying machines are equipped throughout with wear‑resistant pipelines; the steel pipes boast a service life exceeding 10,000 cubic meters, reducing overall operating costs by 50%. In tunnel shotcrete and anchoring projects, one construction team reported that, after adopting UPE‑lined flexible hoses, the service life of each hose increased from 3 days to 15 days, cutting annual maintenance expenses by 60%. Meanwhile, Zhengxun Heavy Industry’s ZXP4017 wet‑spraying boom pump utilizes high‑chromium alloy wear‑resistant steel for its delivery pipelines; under comparable operating conditions, the replacement cycle of wear parts is significantly extended, resulting in a substantial reduction in total maintenance costs.
II. Extremely low coefficient of friction, effectively reducing conveying resistance and energy consumption.
The low‑friction properties of composite pipeline lining materials represent their second major performance advantage. Ultra‑high‑molecular‑weight polyethylene has a coefficient of friction of only 0.09, significantly lower than that of steel pipe (0.58, according to the Sinopec method), thereby markedly reducing material‑transport resistance. Under identical pipe diameters, UHMWPE can improve conveying efficiency by approximately 16%. Lower frictional resistance translates into reduced load on power‑driven equipment, ensuring operational stability and lowering failure rates. The smooth inner surface, with a roughness as low as 0.082, also offers excellent anti‑scaling performance, minimizing cement slurry deposition inside the pipe and reducing operating costs and maintenance workload.
III. A structural design that balances rigidity and flexibility, offering both high strength and impact resistance.
Composite pipelines adopt a double‑layer structure—outer steel pipe plus an inner polymer liner—enabling complementary performance. The outer steel pipe provides sufficient mechanical strength and compressive resistance, effectively withstanding the hoop stresses and axial tensile forces encountered during high‑pressure pumping, thereby addressing the limited pressure‑bearing capacity of single‑material polymer pipes. Meanwhile, the inner polymer liner imparts excellent wear resistance, corrosion resistance, self‑lubrication, and impact‑resistance. For operating pressures above 1.0 MPa, a composite‑pipe configuration is employed; below 1.0 MPa, a single‑wall pipe is used, ensuring reliable performance across different pressure ratings. In wet‑spraying rig applications, this hybrid rigid‑flexible design enables the pipeline to simultaneously withstand the dual challenges of high‑pressure impacts and abrasive particle erosion.
IV. Significant Comprehensive Economic Efficiency and Low-Carbon Benefits
The composite pipeline’s combined advantages in long service life, low maintenance, and energy-efficient conveyance deliver significant economic benefits. For example, according to usage data from a major steel group: under a working pressure of 3.0 MPa, a 500 mm‑diameter steel pipe has a service life of approximately one year, whereas a lined ultra‑high‑molecular‑weight polyethylene (UHMWPE) pipe lasts about three years, with operating costs only 25%–30% of those for steel. A 16% improvement in conveying efficiency translates into a corresponding reduction in energy consumption for the same pumping volume. Zhengxun Heavy Industry’s wet‑spraying carriage employs a dedicated rigid‑pipe conveying system that replaces conventional flexible hoses, substantially lowering pipeline flow resistance and fundamentally minimizing the risk of blockages; each unit can directly save substantial consumable expenses annually. Steel pipes require only a one‑time capital outlay, and used steel pipes can be refurbished and relined with UHMWPE, extending their service life by a factor of four to five per lining—further reducing costs. UPE composite piping integrates the exceptional wear resistance, corrosion resistance, self‑lubricity, and impact resistance of UHMWPE with the high strength and compressive capacity of metal or reinforced skeletal materials, delivering the benefits of lightweight construction, superior strength, extended service life, and reduced maintenance costs.
V. Material Diversity to Meet Selection Requirements for Various Operating Conditions
Composite pipelines can be classified into various types depending on the lining material, enabling them to meet diverse operating conditions. Steel‑lined polyurethane composite pipes use steel pipe as the base and are lined with a highly wear‑resistant, highly elastic, and highly corrosion‑resistant polyurethane material, offering excellent comprehensive performance in wear resistance, acid resistance, alkali resistance, anti‑scaling, radiation resistance, and resistance to hydrolytic aging. Steel‑lined ultra‑high molecular weight polyethylene composite pipes employ ultra‑high molecular weight polyethylene as the inner lining; their smooth inner surface is non‑adhesive and exhibits an extremely low coefficient of friction, making them ideal for high‑pressure transport of highly abrasive media. UPE ultra‑wear‑resistant concrete‑conveying hoses use UPE as the lining material, featuring an exceptionally low coefficient of friction and virtually no adhesion to any substance, with a service life several times longer than conventional hoses. Steel‑lined rubber composite pipes (rubber‑lined pipelines) utilize rubber as the lining layer, providing superior resistance to chemical corrosion. Users can select the most suitable composite pipeline type based on factors such as the abrasiveness and corrosivity of the conveyed medium, operating pressure, and ambient temperature. Zoomlion’s “Pioneer” series ZG45 wet‑spraying machine features the industry’s first three‑stage gradient flow‑path design, paired with a 150 mm discharge outlet and a 125 mm lower‑machine pipe diameter, further enhancing its adaptability to varying material compositions and significantly reducing the likelihood of pipe blockages.
Overall, the fully automatic wet‑spraying carriage employs a composite pipeline that delivers markedly improved wear resistance, significantly reduced conveying resistance, and reliably assured structural integrity. The steel pipe’s outer layer provides the rigidity needed to withstand high pressures, while the polymer inner lining offers low friction, superior wear resistance, and excellent corrosion resistance. Together, these two components create an optimized conveying passage that balances rigidity and flexibility. Field tests demonstrate that the composite pipeline can substantially extend the replacement interval of vulnerable components, increasing the pipeline’s service life to 4–6 times that of conventional steel pipes. Under comparable conditions, operating costs can be reduced to 25%–30% of those associated with steel pipes, while conveying efficiency improves by approximately 16%. This technological approach has become a key strategy for enhancing the overall operational efficiency of wet‑spraying carriages and lowering total operating costs, with broad application value in tunnel support, mining shotcrete, slope stabilization, and other engineering fields.
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