HVAC Flat Oval Spiral Pipe Stretching and Forming Machine (PDTY-3000)
Round-to-Flat-Oval Duct Conversion: Purpose-built hydraulic stretching and expanding system engineered to transform standard circular spiral ducts into flat oval ductwork, saving vertical ceiling installation space while maintaining equivalent airflow capacity.
Wide Forming Capacity (PDTY-3000): Easily processes duct lengths up to 3000 mm, handles round duct diameters from Φ350 mm to Φ1500 mm, and produces finished flat-oval heights (A) from 150–500 mm with widths (B) up to 2200 mm.
Overview & Flat Oval Duct Forming Principle
The HVAC Flat Oval Spiral Pipe Stretching and Forming Machine (Model: PDTY-3000) is an industrial hydraulic ovalizer engineered to expand and shape round spiral air ducts into standardized flat oval ductwork[cite: 138]. Flat oval spiral ducts combine the superior airflow dynamics and low pressure drop of round spiral pipes with the low-profile height advantages of rectangular ducts, making them indispensable for low-ceiling commercial and industrial HVAC installations[cite: 138].
Driven by a robust 18.5 kW Beijing Huade hydraulic power pack, this machine clamps the pre-formed round duct over high-speed steel expanding mandrels and stretches the pipe walls outward under smooth, uniform hydraulic pressure[cite: 138]. The calibrated stretching cycle delivers exact cross-sectional dimensions, high joint seam strength, and smooth contours without wrinkling or damaging the exterior zinc coating[cite: 138].
Precision Hydraulic Engineering & Operation Highlights
- Full Hydraulic Power System: Equipped with a heavy-duty Beijing Huade hydraulic unit that generates uniform expanding force across lengths up to 3000 mm, preventing local stress concentration and spiral lock seam bursting[cite: 138].
- Wide Diameter & Profile Adaptability: Accepts round spiral ducts from Φ350 mm to Φ1500 mm and stretches them into flat oval profiles with heights (A) from 150 mm to 500 mm and widths (B) from 520 mm up to 2200 mm[cite: 138].
- Heavy-Duty High-Speed Steel Mandrels: Precision-machined, wear-resistant steel expanding segments resist continuous stretching abrasion and deliver mirror-smooth internal duct finishes[cite: 138].
- Foot Switch & Pushbutton Control: Operators can easily control expansion stroke, clamping, and release cycles via ergonomic foot pedal or panel pushbuttons, ensuring safe single-operator handling[cite: 138].
Technical Blueprint & Parameter Specifications
PDTY-3000 Model Specifications, A/B Dimension Chart, Hydraulic Flattening Machine & Tooling Trays[cite: 138]
Technical Parameters (PDTY-3000 Ovalizer & Flattening System)
| Specification Item | Standard Parameters (PDTY-3000) | Engineering Features & Applications |
|---|---|---|
| Machine Model | PDTY-3000 | Industrial heavy-duty cantilever horizontal ovalizer[cite: 138] |
| Sheet Thickness Range | 0.4 mm – 1.2 mm[cite: 138] | Galvanized steel, stainless steel, and aluminum spiral ductwork[cite: 138] |
| Maximum Duct Length | 3000 mm[cite: 138] | Full 3-meter section expansion in a single continuous cycle[cite: 138] |
| Incoming Round Duct Diameter | Φ350 mm – Φ1500 mm[cite: 138] | Accepts round spiral pipes produced by standard tubeformers[cite: 138] |
| Arm Range Minimum Diameter | 150 mm[cite: 138] | Allows easy insertion into pre-flattened or small initial pipes[cite: 138] |
| Oval Duct Height (‘A’ Dimension) | 150, 200, 250, 300, 350, 400, 450, 500 mm[cite: 138] | Standard vertical low-profile clearances for suspended ceilings[cite: 138] |
| Oval Duct Width (‘B’ Dimension) | 520 mm – 2200 mm[cite: 138] | Wide major axis width provides large airflow cross-section[cite: 138] |
| Tray / Tooling Specifications | 50, 100, 200, 300, 400, 500, 600 mm[cite: 138] | Interchangeable mandrel segments for rapid dimension changeover[cite: 138] |
| Hydraulic Motor Power | 18.5 kW (Beijing Huade Hydraulic)[cite: 138] | High-pressure, low-noise industrial hydraulic pump unit[cite: 138] |
| Control & Electrics | Foot switch & Pushbuttons (Schneider / Chint)[cite: 138] | Simple operator panel with hydraulic pressure gauges[cite: 136, 137, 138] |
| Machine Dimensions & Weight | 6000 × 1200 × 1500 mm | 3800 kg[cite: 138] | Heavy structural base resists dynamic tensile expanding torque[cite: 138] |
| Optional Pre-Press Flattening Unit | 1900 × 1500 × 2200 mm | 650 kg[cite: 138] | Pre-compresses round spiral ducts before expanding for faster cycle[cite: 138, 139] |
Machine Architecture, Pre-Pressing & Finished Duct Showcase
Side Elevation View with Calibrated Expanding Arm[cite: 137]
Hydraulic Pre-Press Flattening Unit Compressing Duct[cite: 139]
Precision Stack of Finished Galvanized Flat Oval Ducts[cite: 141]
Modern Factory Scene with Duct Inventory[cite: 140]
Workshop Standalone Machine Body & Enclosure[cite: 136]
Full Workshop Assembly Setup with Spiral Duct Mounted on Cantilever Mandrel[cite: 143]
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