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The Huizhou 220 kV Digital Park Power Transmission and Transformation Project, invested in and constructed by the Huizhou Power Supply Bureau of Guangdong Power Grid Co., Ltd., is a key infrastructure project for the power grid in southern Huizhou.

The Derutu PC18 mortar spraying machine and DM intelligent plastering machine have been successfully delivered to the project site. These two units handle the two core processes—base-layer mortar spraying and finish-layer leveling—forming a complete mechanized plastering production line. Let’s dive straight into the specifications and performance—details that true professionals will appreciate.

PC18 Mortar Spraying Machine: Dense material feeding prevents hollow spots.

As the primary equipment for base-layer application, the PC18 utilizes a screw-conveying mechanism and is compatible with a wide range of commonly used materials, such as site-mixed cement mortar and ready-mixed mortar.

Key specifications:

~Main unit power: 9.2 kW; 380V industrial power supply

~Output flow rate: 45 L/min; daily spraying coverage: approx. 1,000 m²

~Horizontal conveying distance: 50 m; suitable for operations across multiple buildings on-site

~Maximum aggregate particle size: ≤6 mm; compatible with standard on-site mortar mix ratios

~Hopper capacity: 92 L; total machine weight: 288 kg

Substation walls typically feature concrete substrates, making bond strength the critical factor during base-coat mortar spraying. The PC18 system utilizes high-pressure atomization to force mortar particles into substrate pores, creating a mechanical interlock; this results in a bond strength approximately twice that of manual spattering, thereby physically reducing the risk of delamination. Its large-pitch screw design minimizes the likelihood of pipe blockages and ensures consistent material output, making it well-suited for infrastructure projects with complex on-site conditions.

DM Intelligent Plastering Machine: Millimeter-level precision

Following the initial shotcrete base coat, the DM plastering machine handles the finishing layer—performing simultaneous leveling and smoothing—thereby replacing the traditional manual processes of setting screed rails and using straightedges for leveling.

Key specifications:

~Plastering height: 4.2m; suitable for standard floor heights found in station main control buildings, power distribution rooms, etc.

~Plastering width: 1m; operating efficiency: 4m²/min; daily output: approx. 800m².

~Microcomputer-controlled automatic leveling; verticality and flatness deviations controlled within 2mm.

~Servo-motor driven; powered by a 48V battery with an 8-hour runtime per charge.

~Dimensions: 120 × 69 × 205cm; total weight: 252kg.

~Modular design; easy to disassemble, assemble, and relocate.

Power transmission and transformation projects impose strict requirements on the visual appearance and dimensional accuracy of walls. The DM screed-free application method eliminates the need for preliminary layout and the installation of screed rails, allowing the wall surface to be formed in a single pass, with manual finishing used to detail internal and external corners as well as areas around door and window openings. Battery power eliminates reliance on fixed temporary power outlets on-site, offering greater flexibility when moving between floors and buildings while also avoiding the safety hazards associated with trailing power cables.

Dual-Machine Collaboration: A Single Solution Covering the Entire Process

The PC18 handles spraying, while the DM handles smoothing; a team of just 3–4 people operating these two machines can form a complete plastering line—with one person loading material, one spraying, and one operating the smoothing machine. This setup offers significantly higher efficiency compared to traditional manual crews of 5–8 workers, while ensuring consistent and controllable surface quality.

For infrastructure projects like substations—characterized by tight schedules and high standards—the value of mechanized construction lies not in abstract concepts, but in tangible results: precise measurements for every wall and the timely completion of every project milestone. The Deruitu equipment has already undergone delivery and commissioning and will be progressively deployed for operations in alignment with the project's construction schedule.