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Identification and Management of Core Wear Parts for Wet Spraying Boom Trucks
Release time:
2026-08-12
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Summary:
As a critical support system in tunneling and underground engineering, the performance efficiency and construction costs of wet-spraying rigs largely depend on the management and replacement strategies for their wear‑prone components. These parts, subjected to continuous abrasion from concrete, chemical corrosion, and mechanical impact, require periodic replacement. Systematically identifying and managing these vulnerable components is essential for ensuring uninterrupted construction and controlling maintenance expenses.
I. Wear Parts of the Concrete Delivery System
The conveying system is the most severely worn component, as it is in direct contact with the concrete mix.
1. Delivery cylinder and concrete piston: The inner wall of the delivery cylinder and the rubber piston together form the core pumping unit. Under high pressure, the piston undergoes reciprocating motion; wear on its lip can lead to a drop in pumping pressure and reduced efficiency. Additionally, the inner wall of the delivery cylinder may lose its roundness due to prolonged wear.
2. Conveying pipelines and bends: These include straight pipes, hinged bends, and end‑type rubber hoses. In particular, the bend sections are subjected to continuous impact and directional changes from the concrete flow, resulting in an inner‑wall wear rate that far exceeds that of straight pipes.
3.S Valves and their components: S The pipe valve (also known as a concrete distribution valve) switches the concrete flow direction during oscillation. Its critical components, such as the wear‑resistant wear plate and the cutting ring’s mating surfaces, experience rapid wear due to high‑frequency shearing of the concrete; once sealing becomes inadequate, severe slurry leakage can occur. The seals on the oscillating cylinder are also prone to failure.
II. Wear Parts of the Concrete Spraying System
The system is responsible for the final shaping of the concrete, and wear directly affects the quality of the shotcrete.
1. Nozzle and Spray Head: The spray head is the mixing zone for concrete and accelerating agent. Its internal vortex chamber and outlet nozzle are subjected to erosion by high‑velocity, aggregate‑laden slurry, causing the orifice diameter to expand and deform, which in turn leads to beam divergence and increased rebound.
2. Quick-setting agent delivery lines and components: The pipelines, fittings, and precision atomizing nozzles that convey the quick-setting agent from the metering pump to the spray nozzle may fail due to crystallization, blockage, or corrosion of the agent.
III. Wear Parts of the Mixing and Feeding System
The system is responsible for the temporary storage and preliminary mixing of materials.
1. Agitator blades and liner plates: The agitator blades inside the hopper and the liner plate beneath them are in constant friction with the sand and gravel aggregates, resulting in extremely rapid wear.
2. Hopper and Screen: The hopper discharge opening and the screen designed to prevent large aggregates from entering are also wear parts.
IV. Chassis, Hydraulics, and Other Common Wear Parts
This component forms the general foundation of the equipment and likewise requires scheduled replacement.
1. Hydraulic System Seals and Filters: All seals in hydraulic cylinders—such as oil seals and dust rings—can leak due to aging and wear. Hydraulic fluid and fuel filters should be replaced regularly to ensure the cleanliness of the fluid.
2. Electrical components—such as sensors and proximity switches—may malfunction due to vibration, moisture, or dust accumulation.
3. Lubrication System and Standard Components: The grease nipples and pipelines of the centralized lubrication system may become clogged. Bolts and pins in high-stress areas may need to be replaced due to fatigue.
Overview of Major Wear Parts and Maintenance Recommendations
| Systematic classification | Typical wear parts | Main failure modes | Key Recommendations for Maintenance and Replacement |
| Conveying system | Rubber piston, delivery cylinder, S Valve components (wear plates, cutting rings), conveying pipelines (especially bends) | Wear, erosion, and seal failure | Regularly inspect wear levels and perform preventive replacements according to the maintenance schedule; use high-quality wear-resistant components. |
| Injection system | Nozzle (including spray nozzle), rapid-setting agent pipeline, and spray nozzle | Erosive wear and corrosion-induced blockage | Inspect the spray pattern and rebound rate; regularly flush the accelerating agent lines. |
| Mixing and Feeding System | Agitator blades, hopper liners, screens | Wear, deformation | Regularly inspect the thickness and promptly perform weld repairs or replacement. |
| General-purpose basic components | Hydraulic seals, filter elements for various systems, electrical sensors, and critical bolts | Aging-related leakage, blockage, malfunction, and loosening | Replace seals and filter elements strictly in accordance with the maintenance schedule; perform regular inspections and calibrate sensors and fasteners. |
In summary, managing wear parts for wet‑spraying rigs is a core maintenance task. The key lies in establishing a preventive replacement schedule based on operating hours and dynamically adjusting it according to workload intensity. By using high‑quality original‑equipment or certified‑brand spare parts and maintaining proper operational practices—such as ensuring adequate lubrication and preventing oversized aggregates in the mix—the service life of wear parts can be significantly extended. Meanwhile, maintaining comprehensive replacement records provides data to forecast spare‑part requirements and optimize inventory, ultimately maximizing equipment availability and economic efficiency.
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