PU foam preinsulated steel pipe, directly buried underground, district heat distribution steel pipe making machine
1. Pipe structure
Pipe structure
Rigid polyurethane spraying polyethylene winding prefabricated directly buried insulation pipe consists of a steel working pipe, spraying polyurethane rigid foam insulation layer, and winding polyethylene outer protective pipe. See the following figure for product structure:
2. Technological flow:
Technological flow
(1). Steel pipe rust removal: Use a hydraulic lifter to transport the steel pipe to the conveying line. The steel pipe rotates and enters the shot blasting chamber. When the internal sensor collects the signal of incoming steel pipe, the shot blasting machine starts to work. The shooting projectiles hit the outer surface of the steel pipe, removing rust and impurities attached to the pipe surface, and the steel pipe moves onto the conveying line. After shot blasting treatment, the outer surface of the steel pipe meets the requirements of SA2.5.
(2). Polyurethane spraying: The steel pipe moves forward at a constant speed on rotating wheels. The spraying robot blows foaming materials to form an umbrella-shaped fog to evenly spray it onto the surface of the rotating steel pipe. The polyurethane raw materials foam within a short period of time to achieve the required compressive strength and design thickness. When the insulation layer is very thick, multiple times of spraying can be required.
(3). Polyethylene pipe winding: The steel pipe that has been coated with a polyurethane insulation layer rotates and moves along the conveying line. The extruder extrudes a certain thickness of molten polyethylene sheet and winds it on the outer surface of the insulation layer. As the insulated steel pipe continues to move forward, the extruder continuously extrudes the molten polyethylene sheet material and wraps it on the surface of the polyurethane layer to form a protective layer.
(4). Spray cooling: The semi-finished pipe wrapped with a polyethylene outer protective layer is cooled by an online spraying device. The polyethylene outer protective layer tightly wraps the polyurethane insulation layer on the steel pipe, completing the production of an insulated steel pipe.
(5). Tracking and cutting: online track the pipe and cut automatically. When the sensor detects an incoming pipe, the control system automatically starts the cutting saw. While the saw blade rotates at high speed, the cutting mechanism performs circumferential cutting around the pipe. Online cutting not only ensures high-quality cutting ends but also ensures the continuity of production and improves production efficiency.
(6). Number the finished pipe and put the pipes into the warehouse
3. Features of the polyurethane spraying PE winding insulation pipe
Performance
(1). Density, thermal conductivity, compressive strength, and other indices of the polyurethane insulation layer are uniform and consistent. Therefore, the overall performance of the pipe is superior.
(2) The polyurethane insulation layer is formed by free foaming. Since polyurethane is foamed perpendicular to the axial direction of the pipe, the compressive strength of the insulation layer is improved.
(3). The polyurethane insulation layer is formed after spraying. The raw materials are sprayed onto the outer surface of the steel pipe in a liquid form, and then begin to foam. Due to the high reaction activity of the spraying polyurethane raw materials, adhesion between the steel pipe surface and the polyurethane foam layer is stronger.
(4). Roughness of the surface of the polyurethane foam layer is more conducive to increasing the bonding effect between the insulation layer and the outer HDPE protective layer.
(5). Polyurethane insulation layer can be sprayed according to the thickness required by customers, with a thickness of 15-20mm. Costs can be significantly saved.
(6). Prefabricated directly buried insulation pipes produced using the "spray winding" process, with polyurethane insulation layer and polyethylene outer protective layer thickness adjustable according to users' needs. The production process does not require additional molds and tooling, making it simple and easy to operate. Due to the absence of expansion stress on the polyethylene outer protective layer during foaming in the "spray winding" process, the thickness of the polyethylene outer protective layer can be relatively thinner, reducing costs for customers.
(7). The polyethylene outer protective layer is formed by circumferential winding, and circumferential elongation and tensile strength are significantly improved. The circumferential strength of the polyethylene protective layer is stronger.
(8). As this is a completely automatic production line, Production speed is improved, and production quality is consistent and superior.
4. Main indices of the composite pipe
Product Parameters
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Product Specification
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Details
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Steel pipe dia
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508-1620 mm
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Foaming thickness(mm)
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30-100mm
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HDPE Jacket thickness
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3-10mm
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| Supply Date |
60-80 Days |
Company Profile
Qingdao Huashida Machinery Co., Ltd was established in 2003. Since its inception, Huashida has focused on plastic polyurethane insulation pipe production line, 3PE anti-corrosion pipe production line, large diameter underground pipe production line, and plastic pipe joints for 20 years. We always attach great importance to research and development,
collaborating closely with Beijing University of Chemical Technology, Qingdao University of Technology, and scientific research institutions. By absorbing advanced technology from home and abroad, after 20 years of endeavor, we now rank one of the top 3 manufacturers in the industry in China. Huashida machines have been well received in Saudi Arabia, Kazakhstan, Uzbekistan, the United Arab Emirates, Turkey, Russia, etc.
Customer Visit
International Exibition
Certifications
1. ISO 9001
2. ESTABLISHED OCCUPATIONAL HEALTH AND SAFETY MANAGEMENT SYSTEM CERTIFICATE
3. ENVIRONMENTAL MANAGEMENT SYSTEM CERTIFICATE
4.
BUSINESS LICENCE
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