Intelligent Coating Delivery System Solves Paint Supply Challenges

With the growing popularity of automatic spraying equipment, a frequently overlooked link has become a new bottleneck for coating production efficiency and quality: the coating delivery system. This "last mile" from paint supply tanks to spray guns, seemingly simple, hides a host of issues including paint waste, inefficient color changes, inaccurate metering, and complex cleaning. According to industry statistics, traditional paint supply methods result in 5%–15% waste of residual paint in pipelines during color changes, causing hidden losses of hundreds of thousands of yuan annually for spraying enterprises alone. To address this industry pain point, Dongguan Mansheng Automation Equipment Co., Ltd. has recently fully upgraded its intelligent coating delivery system, integrating three technical modules: central paint supply, high-precision gear pump metering, and rapid color change & cleaning. It provides customers with a full-link closed-loop management solution from the feeding end to the spray gun end. Test data from Mansheng’s customers shows the system helps manufacturers reduce paint waste by over 30%, shorten color change time by approximately 60%, and achieve flow control accuracy of ±0.5%.

In modern automatic spraying production lines, the paint supply system acts like the human aorta—delivering "blood" (coating) stably and accurately from the paint mixing area to each "organ" (spray gun). A complete automatic spraying paint supply system typically includes: paint storage vessels, paint delivery pumps (plunger/diaphragm/gear pumps), filters, pressure regulators, delivery pipelines, gun stations, and control systems. However, many enterprises focus only on spray guns and robotic arms when purchasing automatic spraying equipment, underinvesting in the paint supply system and laying hidden risks. Mansheng Automation’s Technical Director pointed out common paint supply problems:

• Inaccurate metering: Flow fluctuations in traditional plunger or diaphragm pumps cause uneven coating thickness.
• Color change waste: Residual paint in pipelines cannot be recycled and must be drained and discarded during each color change.
• Inefficient cleaning: Manual pipeline cleaning takes dozens of minutes to hours.
• Unstable pressure: Fluctuating paint supply pressure affects atomization, leading to film defects.

These issues stem from treating the paint supply system as a simplified "one pump + one pipe" extensive model rather than an independent intelligent subsystem.

Mansheng’s latest intelligent coating delivery system systematically integrates the paint supply link into automation solutions, consisting of three main modules:

For large coating workshops with multiple automatic spraying equipment or spray guns, Mansheng provides a centralized paint supply system. Various coatings are stored and mixed in a dedicated paint mixing room, then delivered to each spraying station through circulating pipelines after stirring, filtering, and pressurization. The system adopts a main line circulation + branch line supply structure: paint circulates continuously between the main supply pipe and return pipe to prevent settling and viscosity changes; branch valves open automatically when a spray gun is activated. Key advantages:

• Consistent coating parameters (viscosity, temperature, pressure) at each station, eliminating color differences fundamentally.
• Shared paint source for multiple spray guns, reducing mixing and cleaning workload.
• Automatic stirring in supply tanks to prevent paint settling and stratification.
• Real-time liquid level monitoring with low-level alarms or automatic refilling.

Mansheng has deployed systems supporting over 10 spray guns for multiple clients. For a major home appliance group with 8 automatic spraying machines (12 guns), daily paint mixing shifts were reduced from 3 to 1, achieving unmanned operation.

Mansheng prioritizes coating gear pumps for core delivery, offering superior accuracy and pressure stability over pneumatic diaphragm or plunger pumps—ideal for high-end automated lines. External meshing gear pumps use high-precision gear pairs driven by servo motors for quantitative delivery. Core features:

• High-precision metering: Flow proportional to speed, nearly unaffected by outlet pressure; closed-loop control achieves ±0.5% accuracy.
• Pulse-free feeding: Continuous rotation ensures stable output pressure, eliminating spraying defects from pressure spikes.
• Wide viscosity adaptability: Stable delivery for low-viscosity solvent-based to high-viscosity high-solids coatings.
• Multi-component precise ratio: Dual servo gear pumps for 2-component coatings (polyurethane, epoxy) enable 1:1 to 30:1 ratios before static mixing.

Color change is one of the most time-consuming spraying steps. Traditional manual draining, solvent flushing, and repeated rinsing are slow and wasteful. Mansheng’s system includes an automatic color change & cleaning module with color change valve blocks, multi-path solvent flushing, and spectral cleanliness sensors. A three-stage flushing process (compressed air pushing, high-pressure solvent washing, compressed air drying) takes only 5–8 minutes, cutting solvent consumption by ~70% vs. manual operation. The valve block’s dead-angle-free flow design eliminates residual buildup. A pigging system is available as a premium option: a dedicated "pig" fits tightly inside pipelines, pushing residual paint back to supply tanks via compressed air before solvent cleaning. This reduces cleaning time from hours to minutes and drastically cuts paint and solvent waste.

The pigging system recovers over 95% of pipeline residual paint. For a 30m pipeline (10mm ID), traditional methods waste ~1,700 liters/year (≈¥170,000 at ¥100/liter); the pigging system recoups nearly all losses.

Automatic cleaning takes just 5–8 minutes (vs. 30–60 minutes manually), adding over one hour of daily spraying time for multi-variety, small-batch producers.

Gear pump closed-loop delivery tightens coating thickness tolerance from ±8μm to below ±3μm, drastically reducing runs, orange peel, and other flow-related defects.

The system is deeply integrated with Mansheng’s 6th-generation 360° high-speed rotating automatic spraying equipment, managed via a unified touchscreen interface for parameter setup, color change, and cleaning. It supports OPC UA connectivity with MES/ERP for real-time data upload, enabling accurate cost accounting and traceability.

Mansheng engineers provide free paint system assessments to match pumps and pipelines to actual working conditions.

Advanced models integrate real-time viscosity monitoring via vibration sensors, automatically adding diluent and stirring when thresholds are exceeded—critical for water-based paints sensitive to temperature/humidity, reducing rework from viscosity fluctuations.

Central supply + gear pump closed-loop system for 2-component water-based insulating paint (A:B=10:1, ratio accuracy ±0.8%). Insulation thickness fluctuation reduced by 40%, improving performance consistency.

12 automatic spraying machines fed by central system, supporting 5-color rapid changes (avg. 7 minutes). Daily mixing shifts cut from 3 to 1, lowering labor costs.

Online viscosity monitoring stabilizes delivery across -10℃ to 35℃, sharply reducing winter spraying rejects.

Color changes every 2–3 hours; pigging system cuts time to 5 minutes, saving ~¥300,000/year in paint costs.

The system’s additional investment is ¥80,000–150,000 (gear pumps, valves, pipelines, controls). Annual returns:

• Paint savings: ¥100,000–200,000 via pigging.
• Solvent savings: ~70% reduction, ¥20,000–40,000/year.
• OEE improvement: increased productive capacity.

Payback period: 6–14 months (≤6 months for frequent color-change lines).

All parameters, consumption, color change, and cleaning records connect to Mansheng’s cloud or customer MES via IoT gateways. Managers remotely monitor usage, identify waste, generate reports, and optimize inventory.

A modular, fully automatic paint supply & color change workstation is nearing completion, integrating tanks, pumps, valves, pipelines, and cleaning into a cabinet. Full closed-loop operation (color selection, pipeline switching, pre-flushing, stable feeding) requires no manual intervention, scheduled to launch in early 2026.

Mansheng offers free nationwide paint system assessments. Provide coating type, daily output, color change frequency, gun count, and pipeline length for a customized report covering waste analysis, optimization plans, equipment configuration, and ROI calculations. "Many clients don’t realize how much they waste on coating delivery until we run the numbers," said Mansheng’s Sales Director. "Our goal is to deliver every drop of paint exactly where it needs to go."