PUR Foam Spraying Preinsulated Steel Pipe Production Line for District Heating

Polyurethane spraying Polyethylene winding pre insulation pipe production line, developed independently by HUASHIDA company, owns a number of national patents. According to the third-party standardization evaluation, the technical advancement level is level 5, reaching the domestic advanced level.

It won the title of the first set of technical equipment in Shandong Province. The unit adopts continuous spraying or intermittent spraying production process. High degree of automation, fast production efficiency, saving raw materials, foaming closed cell rate increased, water absorption reduced, trinity molding, more reliable performance. Low carbon environmental protection and higher economic and social benefits.

Our company independently develops Polyurethane Spraying Foam Preinsulated Steel Pipe Making Machine, which consists of three parts: Steel Pipe Shot Blasting Machine, polyurethane spray production line, and PE winding production line.

1. Rust removal on the outer wall of the steel pipe
2. After rust removal, the steel pipe is lifted to the pipeline rack - it is transported to the spraying conveyor line by a pipe transport cart - the steel pipe is heated - polyurethane spraying - it is transported to the storage platform by a lifting cart - PE layer winding - water spray cooling - connection incision - finished pipe offline - finished pipe inspection - port repair - spray code packaging offline

1. Dust removal meets environmental standards

   By adopting an intelligent shot blasting and rust removal scheme, the equipment can be opened sequentially and self locked, the shot blasting motor can save energy through frequency conversion, the sand volume can be set according to the pipe diameter, the air washing system can clean the shot sand, and the plug type can quickly change specifications. The three-level dust removal meets environmental protection standards.

2. Suitable for the production of large-diameter insulation pipes

   By adopting a high load-bearing spiral conveyor line, the polyurethane foam spraying and polyethylene winding processes are continuously carried out, which has the advantages of high efficiency, energy saving, speed, and stability. It is suitable for the continuous production of large-diameter insulation pipes and saves investment in transportation equipment.

3. Automated operation of production lines

   Realize automatic processing of upper and lower pipes. The conveyor line is equipped with upper pipe sensors, automatic acceleration tracking sensors, automatic acceleration detachment sensors, detachment confirmation sensors, and automatic descent sensors to ensure the automated operation of the production line.

4. Spraying saves materials

   The online spraying speed of pipelines is fast; Constant intermediate frequency power, infrequent on/off, minimal impact on the power grid, balanced temperature, and energy conservation; Continuous spraying saves raw materials, and the head and tail of the steel pipe are automatically connected to ensure consistent surface thickness during spraying.

5. Efficient extrusion of pipelines

   Using efficient and energy-saving extruders for extrusion, and using mechanical clamping devices for winding and compacting; Automatic cutting, triple cutting of anti-corrosion coating, automatic pipe removal during offline production, accelerating detachment.

6. Automated precision machining of pipeline interfaces

   Centralize multiple processing steps on a single device for automated processing, achieving precise control over the size, angle, and blunt edge dimensions of the pipe opening.

About Huashida

Founded in 2003, Qingdao Huashida Machinery Co., Ltd. specializes in the development and manufacturing of:

• 3PE anti-corrosion pipe coating lines
• PU insulation pipe production lines
• Large-diameter underground pipe equipment
• Pipe joint and related machinery

Over the past 20+ years, Huashida has focused on continuous technical development and close collaboration with universities and research institutions, including:

• Beijing University of Chemical Technology
• Qingdao University of Technology

With long-term industry experience and ongoing innovation, Huashida is now recognized as one of the leading manufacturers in this sector in China.