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18-Station Tubular Heater Shrinking Machine
Products Description & Specification
Introducing our innovative 18-Station Tubular Heater Shrinking Machine – designed to revolutionize heating element manufacturing. This advanced equipment uniformly reduces the tube outer diameter through a precise progressive shrinking process, significantly increasing the density of magnesium oxide (MgO) powder inside the heating element. The result is superior thermal conductivity and electrical insulation strength. The machine features an integrated cast frame, ensuring exceptional stability and precision even under continuous high-speed operation.
|
Model |
Power Supply |
Size(rw*H)mm |
Weight(kg) |
|
GV001-12S |
Three Phase(380V/50Hz/6kW) |
1200X800X1200 |
1800kg |
|
GV001-16S |
Three Phase(380V/50Hz/9kW) |
1600X800X1200 |
2500kg |
|
GV001-18S |
Three Phase(380V/50Hz/12kW) |
2100X800X1200 |
2800kg |
How It Works – The Progressive Shrinking Process
Traditional tube shrinking machines use a few stations, such as 8 stations, resulting in large deformation amounts per cycle. This easily leads to stress concentration on the tube wall, surface scratches, and uneven or non-straight tubes after shrinking, resulting in defective products. Our 18-station design breaks down the total shrinkage amount into 18 extremely small deformation steps, using 18 sets of alloy rollers to gradually reduce the diameter. This results in a high yield rate and excellent quality of the shrunk tubes, significantly reducing production costs.
Workflow Summary:
**Feeding:** Aluminum, iron, copper, or stainless steel tubes are filled with powder in the powder filling machine and then fed into the first station by an automatic feeder.
**Step-by-Step Compression:** The tube passes sequentially through 18 pairs of precision alloy rollers, with each pair of molds reducing the diameter by only 0.1- 0.3 mm.
**Density Increase:** As the tube diameter gradually decreases, the internal magnesium oxide (MgO) powder is uniformly compacted, significantly increasing the density.
**Finishing and Output:** The final few stations perform dimensional finishing, resulting in finished tubes with consistent outer diameter, smooth surface, and uniform wall thickness.
The core advantage lies in the fact that each deformation is extremely small, allowing the metal lattice sufficient time to rearrange, thereby eliminating internal stress, preventing cracking, and ensuring that the density of the MgO powder decreases.
Comparison: 8-Station vs 12-Station vs 18-Station
|
Parameter |
8-Station |
12-Station |
18-Station |
|
Max reduction per step |
0.8–1.0 mm |
0.5–0.7 mm |
0.2–0.3 mm |
|
Surface roughness (Ra) |
≤1.6 μm |
≤0.8 μm |
≤0.4 μm |
|
Wall thickness deviation |
±0.10 mm |
±0.08 mm |
±0.05 mm |
|
MgO density improvement |
baseline |
+10% |
+15~20% |
|
Max applicable tube length |
600 mm |
900 mm |
1200 mm |
|
Recommended application |
Short tubes, basic heater tubes |
General purpose |
High-end, long-life heating elements, export-grade products |
Why choose 18-Station Shrinking Machine
|
Advantage |
Description |
|
±0.05mm high precision |
18-step micro-reduction ensures final OD tolerance within ±0.05mm, meeting the strictest heater tube assembly requirements. |
|
Zero surface scratches |
Minimal reduction per step combined with high-gloss dies produces a mirror-smooth finished surface – no secondary polishing needed. |
|
Wall thickness uniformity improved by 30%+ |
The progressive process avoids excessive single-step stretching, resulting in wall thickness deviation more than 30% better than conventional machines. |
|
MgO density increased by 15–20% |
Uniform compaction improves thermal conductivity and increases insulation resistance (up to 100MΩ or more). |
|
Suitable for extra-long tubes |
Capable of processing heater tubes longer than 1000mm with low bowing. |
|
Integrated cast frame |
The entire machine is built on a high-strength cast frame, eliminating resonance at high speeds and extending service life. |
Inspection Standards
1. Visual Inspection
The heating tube should be free of any visible defects or damage. Any surface cracks, scratches, or deformities should be noted, and the heating tube must be rejected if the defects or damage are excessive after the tubes are used in the 18-Stations Tubular Heater Shrinking Machine.
2. Dimensional Inspection
The heating tube should be measured to ensure that it meets the required dimensions. The length, diameter, and thickness of the heating tube should be within the allowable tolerance, as specified in the product specifications.
3. Electrical Properties
The electrical properties of the heating tube should be measured to ensure that they meet the required specifications. The resistance of the heating tube should be within the specified range, and the insulation resistance should also be within the allowed limit.
4. Tightness of the Shrinkage Seal
The tightness of the shrinkage seal should be inspected to ensure that it is properly sealed. Any leakage found during the pressure test should be repaired, and the heating tube must be retested.
5. Performance Testing
The performance of the heating tube should be tested to ensure that it can meet the requirements of the electric rice cooker. The heating speed, heat preservation, and power utilization efficiency should be within the specified range of the 18-Stations Tubular Heater Shrinking Machine.
The tube rolling machine can be used together with the GV-014 Feeding machine and can be equipped with a tube marking device.
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