Agricultural Machinery Powder Coating Line

The agricultural machinery powder coating line is a specialized powder coating equipment system designed for agricultural production equipment (such as tractors, harvesters, seeders, etc.) and related accessories. Its core function is to form a weather-resistant, wear-resistant, and corrosion-resistant powder coating on the metal surface of agricultural machinery through automated or semi-automated processes. This coating adapts to harsh working environments such as field humidity, pesticide erosion, and mechanical friction, extends the service life of agricultural machinery, and improves the appearance texture. In terms of design, this equipment line is fully adapted to the characteristics of agricultural machinery, including "large size, heavy oil contamination, and high wear resistance". Different from general industrial powder coating lines, it is a key supporting equipment in the manufacturing and renovation process of agricultural machinery.

I. Composition of Core Equipment

The agricultural machinery powder coating line is usually composed of a pretreatment unit, a spraying unit, a curing unit, a cooling unit, and a conveying system. Each link is designed specifically according to the characteristics of agricultural machinery:

Pretreatment Unit

As the core to ensure coating adhesion, it is equipped with a complete process of "pre-cleaning - degreasing - derusting - phosphating - drying" in response to the fact that the surface of agricultural machinery workpieces (such as tractor bodies and harvester cutting parts) is prone to adhering to engine oil, soil, and oxide scales. Among them, the degreasing link uses high-concentration degreasers to enhance the cleaning ability for heavy oil contamination; the derusting link can choose chemical derusting or sandblasting derusting (for thick-walled agricultural machinery parts) according to the degree of workpiece rust to ensure surface cleanliness; the phosphating treatment forms a dense phosphating film to further improve the corrosion resistance of the coating.

Spraying Unit

It is divided into a manual spraying booth (suitable for small-batch agricultural machinery accessories, such as plowshares and gearbox housings) and an automatic spraying booth (suitable for large-scale agricultural machinery whole machines, such as tractors and seeder bodies). The spraying booth is equipped with large-caliber electrostatic spray guns (for large-area workpieces of agricultural machinery), which can accurately control the coating thickness (usually 80-150μm, thicker than that of general industrial parts). At the same time, it is equipped with an efficient powder recovery device to reduce coating waste - due to the large coating area of agricultural machinery, the recovery system can reduce the cost of consumables by more than 30%.

Curing Unit

A large-scale curing oven is adopted to meet the size requirements of the whole agricultural machinery or heavy parts. The oven is equipped with a hot air circulation system to ensure uniform temperature (curing temperature: 180-220℃, heat preservation time: 20-30 minutes). It is adapted to the curing needs of weather-resistant powder coatings (such as polyester-epoxy composite powder), avoiding defects such as sagging and pinholes in the coating caused by uneven temperature, and ensuring that the coating does not fade or crack during long-term use in the field.

Cooling and Conveying System

The cooling unit adopts forced air cooling (for thick and heavy parts of agricultural machinery to accelerate the cooling efficiency) to prevent damage to the coating when handling high-temperature workpieces; the conveying system uses a heavy-duty chain conveyor belt with a load-bearing capacity of 5-10 tons, which can stably convey large agricultural machinery workpieces such as tractor bodies and harvester frames. At the same time, the conveying speed can be adjusted according to the production rhythm to adapt to the dual needs of agricultural machinery for "mass production + customized processing".

II. Adapted Agricultural Machinery Types

This coating line can cover most agricultural machinery and accessories, mainly including:

Large-Scale Agricultural Machinery Whole Machines

Tractors (wheeled, crawler-type), combine harvesters, corn harvesters, seeders, transplanters, etc. The line can adjust the span of the conveying track and the height of the spraying booth to adapt to the sizes of different machine models (for example, the length of the body of a large tractor can reach 5-8 meters, and the coating line needs to reserve sufficient operating space).

Core Agricultural Machinery Parts

Engine housings, gearbox housings, cutting blades, plowshares, suspension brackets, hydraulic oil pipe joints, etc. For small parts, the "dense arrangement of hangers" spraying method can be adopted to improve production efficiency; for wear-resistant parts such as blades, the coating can be thickened (up to 120-150μm) to enhance the surface wear resistance.

Renovated Agricultural Machinery Parts

Bodies, chassis, working parts of old agricultural machinery, etc. The pretreatment unit of the coating line can remove the old coating and rust through enhanced derusting and paint stripping processes, and spray a new coating on the renovated parts to realize "reuse of old parts and performance improvement" of agricultural machinery.

III. Key Process Characteristics (Differences from General Coating Lines)

Targeted Pretreatment

General coating lines focus on conventional oil contamination cleaning, while the agricultural machinery powder coating line adds a "pre-cleaning section". It first uses a high-pressure water gun to rinse the soil and weeds on the workpiece surface, and then enters the degreasing link to avoid impurities affecting the subsequent coating quality; at the same time, for thick-walled agricultural machinery parts, the phosphating time is extended (10-15 minutes, compared with 5-8 minutes for general lines) to ensure uniform coverage of the phosphating film.

Large-Size Adaptation Design

The spraying booth has a height of 4-6 meters and a width of 5-7 meters, and the curing oven has a length of 15-20 meters, which can meet the needs of large-scale agricultural machinery whole machines entering and exiting; the conveying system uses high-strength steel, and the track spacing can be adjusted to adapt to agricultural machinery workpieces of different widths, avoiding the problem of "size limitation and inability to accommodate large workpieces" of general lines.

Weather-Resistant Coating Matching

It is equipped with weather-resistant powder coatings by default (such as outdoor-specific polyester powder). This type of coating has the characteristics of UV resistance, acid rain resistance, and pesticide corrosion resistance. The coating is not easy to fade or chalk after 5-8 years of outdoor use, which is far better than the weather resistance of general industrial coatings, and is suitable for the environment where agricultural machinery is parked outdoors for a long time and operates in the field.

Efficient Powder Recovery

Due to the large coating area of agricultural machinery, the spraying booth is equipped with a two-stage recovery system (primary cyclone recovery + secondary filter element recovery), with a powder recovery rate of more than 95%. This not only reduces the cost of coatings but also reduces dust pollution, meeting the dual needs of agricultural machinery manufacturing enterprises for "cost reduction + environmental protection".

IV. Application Scenarios

Agricultural Machinery Whole Machine Manufacturing Enterprises

For example, tractor and harvester manufacturers adopt fully automatic agricultural machinery powder coating lines to realize the fully automated process of "workpiece loading - pretreatment - spraying - curing - unloading". They can handle 20-50 agricultural machinery whole machines per day to meet the needs of mass production.

Agricultural Machinery Accessory Manufacturing Enterprises

For small and medium-sized accessories such as plowshares and gearbox housings, semi-automated coating lines (manual spraying + automatic curing) are adopted to flexibly adjust the production rhythm, adapt to the multi-variety and small-batch accessory production mode, and reduce the equipment investment cost.

Agricultural Machinery Maintenance and Renovation Enterprises

Small manual agricultural machinery powder coating lines are adopted to perform derusting, spraying, and curing on old agricultural machinery parts, realizing "small-batch and customized" renovation operations, helping maintenance enterprises expand the "old machine renovation" business and improve profit margins.

V. Core Advantages

Excellent Coating Performance

The formed powder coating has strong adhesion (reaching Grade 0 in the cross-cut test) and high hardness (reaching above 2H in the pencil hardness test), and can pass the salt spray test for more than 500 hours. It can effectively resist field humidity, pesticide corrosion, and mechanical friction, extending the service life of agricultural machinery by 3-5 years.

Strong Adaptability

The line parameters (conveying speed, curing temperature, coating thickness) can be flexibly adjusted. It can not only process large-scale agricultural machinery whole machines but also process small accessories; it can not only meet the manufacturing of new agricultural machinery but also adapt to the renovation of old agricultural machinery, with a wide range of application scenarios. powder coating line

Balance Between Environmental Protection and Cost

Powder coatings have no solvent volatilization and meet national environmental protection standards (VOC emissions are much lower than those of paint coating); the efficient recovery system reduces coating waste. Although the initial equipment investment is slightly higher than that of general lines, it can save 30%-40% of the cost of consumables in long-term use, with higher cost-effectiveness.

Optional Automation Level

Enterprises can choose fully automated, semi-automated, or manual lines according to their scale. Small enterprises can choose manual lines (with an investment of 500,000-1,000,000 yuan), and large enterprises can choose fully automated lines (with an investment of 5,000,000-10,000,000 yuan), meeting the needs of enterprises with different capital strengths.