Technical Upgrade of Wantong Hydraulic Grouting Machine Oil Cylinder Leading the Localization of Mining Tunnel Support Equipment

The hydraulic cylinder for Wantong hydraulic shotcrete machines is designed for the special conditions of high-pressure pumping and dust erosion in wet spraying machines, establishing a "Pollution Resistance - Fatigue Resistance - Precision Control" integrated technical system. This product adopts independently developed multi-stage buffer hydraulic cylinder technology, effectively solving the industry pain point of oil leakage during high-frequency start-stop processes by optimizing oil circuit design and valve core structure, extending the seal life to 1.5 times the industry average. In terms of material technology, the piston rod surface uses a forged base material combined with multi-layer chrome plating technology, paired with specialized flaw detection equipment to achieve micron-level defect detection, improving wear resistance by 40% compared to ordinary products, perfectly adapting to the particle wear environment during concrete conveying.

The company's R&D team has also innovatively applied the hydraulic cylinder outer tube clamping device to the production process. By using a fixed plate structure distributed above and below, the machining accuracy of the cylinder barrel is improved, ensuring the synchronous operation error of multiple cylinders is controlled within ±1mm, providing core assurance for uniform material distribution in shotcrete machines. In the first half of 2025, Wantong Hydraulic's R&D expenses increased by 15.93% year-on-year. Among the 17 newly added patents, several sealing technologies and buffer structure innovations have been directly applied to the iterative upgrade of shotcrete machine cylinders, stabilizing the product's working pressure within the 25-30MPa range to meet the pumping needs of different models of wet spraying machines.

Expansion into overseas markets has also been remarkable. Leveraging the cost-performance advantage of "15%-20% lower price for equivalent performance," Wantong Hydraulic shotcrete machine cylinders have entered mining engineering markets in Southeast Asia, Central Asia, and other regions through international exhibitions such as Germany's Bauma. In 2024, related overseas revenue increased sevenfold year-on-year, with shotcrete machine cylinders achieving mass application in tunnel projects in countries like Russia and Kazakhstan. The strategic cooperation with Pangu Intelligence in August 2025 will further enhance overseas market response speed through supply chain integration, with overseas revenue expected to exceed 10% in 2025.

The technological breakthroughs of Wantong Hydraulic shotcrete machine cylinders are rewriting the global market competition landscape. In the past, high-end shotcrete machine hydraulic systems heavily relied on imported brands, resulting in high procurement costs and delivery cycles as long as three months. Now, Wantong Hydraulic's products have reached internationally advanced levels in core indicators such as continuous operation reliability and sealing performance, while shortening delivery cycles to within 45 days and improving service response speed by 60%. Industry analysis points out that the localization breakthrough of shotcrete machine cylinders has multiple strategic significances. The core technologies accumulated in pollution-resistant sealing and high-frequency buffering can be horizontally transferred to underground engineering equipment such as shield machines and anchor bolt machines, creating technological synergy. With the advancement of the National Energy Administration's coal mine intelligent pilot projects, Wantong Hydraulic is applying the precision control technology of shotcrete machine cylinders to intelligent oil-gas suspension systems, building a product matrix of "Underground Engineering Equipment + Aboveground New Energy Applications," providing a replicable technological breakthrough path for the upgrading of traditional manufacturing.

From coal mine roadway support to subway tunnel reinforcement, Wantong Hydraulic's shotcrete machine cylinders are safeguarding underground engineering safety with "millimeter-level precision." This hydraulic component, integrating 17 patented technologies, not only supports the core power system of domestic wet spraying machines but also serves as a vivid example of China's manufacturing achieving a transition from following to competing in the high-end hydraulic field. ​