Preservation Line

Qingdao Qinggong Machinery is your single source for complete turn-key preservation lines for the surface treatment of unfinished steel products. Our focus is on cost-effective surface treatment for your parts, and high uptime for our equipment. As a single source supplier, Qingdao Qinggong Machinery is best qualified to integrate surface treatment lines into existing manufacturing systems. We minimize the problems of interfacing the components of the preservation line with the overall manufacturing system, thus facilitating the overall investment planning process for our customers.


Our services include:

• Preparation of manufacturing layouts

• Project management for our customers

• Engineering/Fabrication/Installation

• Modernisation of existing preservation lines

• Spare parts, service and maintenance

Preservation lines are used for pre-heter and final coating. The main area of application is coating parts with a welding primer for temporary corrosion protection. A preservation line usually consists of specially engineered conveyor systems, a roller conveyor shot blast machine, a pre-heater, an automatic paint spray system and a subsequent dryer. Depending on the customer requirements, different types of conveyor systems may be used, such as roller conveyors, chain or slat conveyors, cross conveyors, etc. The entire line is totally engineered around the specific application and size and geometry of the parts.


The pre-heater, in connection with a blow-off unit, allows the processing of parts which are stored outside and may be covered with moisture or even snow or ice. Pre-heating the parts prevents moisture from contaminating the steel media and it reduces the drying time after coating the parts with a primer. The primer, which is sprayed onto the parts by the fully automatic painting system, is dried in a dryer located behind the painting system. Therefore, the treated parts are immediately available for the next manufacturing step without any delay.


1. Electric Panel
2. Control Panel
3. In-feed Transfer Table
4. In-feed Roller Conveyor (sometimes equipped with a cross conveyor to increase the efficiency)
5. Pre-heater to heat up and dry incoming material (this enables the later-applied paint to dry more quickly)
6. Blast Machine (to treat plate widths between 1.5 and 5m, with working speeds of 1.0 – 10m/min)
7. Dust Collector
8. Cleaning (Sweeping and Blowing)
9. Spray booth to coat the freshly cleaned steel material with a layer of water or solvent-based primer to achieve a temporary corrosion protection
10.Drying tunnel with slat conveyor to transport and dry the newly painted material and the continuous drying on the way to the exit of the tunnel
11.Out-feed Roller Conveyor
12.Output Transfer Table

Specific features such as: combined direct flame and hot air circulation pre heating ovens, automatic width detection and wheel adjustment and Clean detector system make wheelblast Preservation lines the number one choice.