Overvit ew of Anti-rusCoating Technology for Construction Machinery

2. Main coating equipment

2.1

The through-type shot blasting chamber is composed of the cleaning chamber body, shot blasting machine, shot circulation system, ventilation and dust removal system, bottom foundation and electrical control system. Non-standard designs of varying sizes can be carried out according to different specifications of workpieces, and standardized equipment can also be selected.

The through-type shot blasting chamber is suitable for surface cleaning and strengthening of structural parts and forgings and castings of construction machinery, to achieve a certain roughness and smoothness of the surface, increase the adhesion of the coating film, and improve the anti-corrosion effect of the workpiece. When the workpiece enters the shot blasting chamber, the shot blasting machine driven by the motor throws out high-speed shot by centrifugal force, which strongly impacts the rust and oxide scale on the surface of the workpiece. After the workpiece moves at a constant speed or rotates several times, it is cleaned thoroughly, and the surface quality can reach the Sa2 to SA2.5 grade standard.

2.2 Water jet spray booth

The water spin spray booth is also known as the hydraulic spin spray booth. This booth adopts a gas laminar flow suppression method to prevent the diffusion of paint mist and filters the paint mist with hydraulic rotary tubes. It is currently one of the more technologically complete spray booths.

The water-jet spray booth is composed of the booth body, electric door, paint mist filtering device, air conditioning supply air device and exhaust air device. The lighting fixtures are installed on both sides of the room, with an illuminance of over 500 Lux, and can be controlled in groups. Flammable gas concentration detection and alarm devices are installed indoors. The paint mist filtration device consists of a washing plate, a hydraulic spinning device, an underground water tank and an exhaust device, with a paint mist removal rate of over 98%. The air conditioning supply air device is the main component that makes the gas form a laminar flow state. The air sent into the air supply chamber is filtered and heated, and then evenly distributed into the room through the air supply ceiling, making the indoor air velocity uniform. When there are no workpieces, the vertical air velocity can reach 0.35 to 0.4 m·s ⁻ ¹. The exhaust device uses a fan to filter the paint mix-containing gas in the room through a hydraulic spinning tube and then discharge it between the water tank and the washing plate.

2.3 Hot air drying room

The drying method is hot air circulation convection. Its greatest advantage is uniform baking, especially suitable for construction machinery parts with large heat capacity. The heating heat sources include steam, electricity, light diesel oil, natural gas, liquefied petroleum gas, etc. Where conditions permit, liquefied petroleum gas should be given priority. This is a clean and efficient energy source. Its greatest advantage is that the production and operation cost is only 35% to 40% of the electricity cost.

2.4 Conveying System

For the components (structural parts) of construction machinery, the use of self-propelled electric hoists is an effective choice.

The self-operated electric hoist conveying system consists of the portal frame column, load-bearing track, sliding guide rail and collector, cargo car, electric hoist, and a central control cabinet controlled by PC.

This system integrates the essence of four major technologies: mechanics, electronics, computers and automatic control, and concentrates the four major logistics links of warehousing, transportation, loading and unloading, and process operation. Not only can workpieces be continuously or step by step conveyed according to the preset program, but it is particularly convenient that in places with manual operation, such as the upper and lower parts, and the spray painting room, automatic or manual free lifting can be achieved.