the digital controlled spiral wound machine without mandrel ,which is developed and produced by our own plant,has been added another function of  automatci welding ,this machine adopts 4 wheels winding craft (positive and passive) working simutaneously with the advantage of using steel strip to wind directly (according to  the girth of gakset caculated from the diameter) without  using spiral chip  mould . in this case,you don't need a corresponding chip of each size especially  the larger ones which not only cost much but also the precision is hard to meet the technical demand. Although the chip  can achieve technical requirements ,it is easy to become loose  during the winding process. the machine adopts new winding craft, It can reduce the cost of producing spiral wound gasket without using chips of any sizes.
the machine can also wind automatically with the inner ring with a high speed (varies infinitely) and the finished gasket is flat and not loose. the degree of  tightness of spiral gaskets is controlled by the adjustable pneumatic pressure. while the strain force is ensured by adjusting electromagnetic voltage with electromagnetic resistor, the diameter of the spiral gasket is controlled by the controller. set the spiral size you need , and the machine will stop automatically when winding to the set size.
main technical parameter:
Voltage: 380V 50HZ
Power: 0.55KW (varies infinitely)
Mini winding diameter: DN240
Max winding diameter: DN3000
Width of winding sealing plane: 5——50MM
Cylinder travel : 100MM
Pneumatic pressure: 0-0.8Mpa
Adjustable magnetic voltage: 0-15V
Automatical attenuation voltage: 0-3V
Displacement transducer: 0-60MM
Precision of controller: 0.1MM
Dimension: 1100*700*1700MM
Weight: 320KG