Cylinder Body | QT500-7 Ductile Iron Casting
Integrally cast from QT500-7 ductile iron. It features high strength, good toughness and impact resistance, with outstanding pressure-bearing capacity and resistance to cracking under continuous high pressure. The inner space of the cylinder body serves as the oil chamber, and an oil inlet is machined at the bottom. As a characteristic of the plunger cylinder, the inner wall of the cylinder barrel does not require precision machining, which reduces processing costs and suits the high-tonnage pressure-holding working conditions of vulcanizing machines.
Plunger | Chilled Cast Iron Main Body
Solid plunger with chilled treatment on the working surface. The surface layer has high hardness, good wear resistance and anti-scuffing performance. High-pressure oil pushes the bottom face of the plunger to move upward; the upper end of the plunger connects to the flange to drive the hot plate of the vulcanizing machine for mold closing.
Cylinder Mouth Guide Sleeve
Mounted at the upper opening of the cylinder barrel to provide radial support, restrict plunger deflection and ensure vertical lifting of the plunger. Grooves are designed for installing the complete set of sealing parts.
Seal Assembly | Oil and Temperature Resistant Oil Seal
Consists of main oil seal, dust ring and backup ring. The oil seal resists hydraulic oil corrosion and high temperature. It is not prone to aging or hardening under the high-temperature environment of vulcanizing machines and prevents leakage of hydraulic oil under high pressure. The outer dust ring blocks rubber dust and impurities to protect the plunger working surface from scratches.
Top Flange | QT500-7 Ductile Iron
Flange made of the same QT500-7 ductile iron with precisely machined bolt holes. It connects the plunger and the upper mold plate of the vulcanizing machine, bears huge mold-closing pressure and resists deformation and fracture.
Air Vent
An air vent is reserved on the cylinder body to discharge air inside the cylinder during the initial oil filling of equipment, avoiding pressure jitter and unstable pressure holding.
Working Principle:
Pressurization: High-pressure hydraulic oil enters the cylinder chamber through the oil inlet at the bottom of the cylinder body. Oil pressure acts on the lower end face of the plunger and pushes the plunger to extend upward to complete mold closing and pressure-holding vulcanization.
Mold Opening and Pressure Relief: The hydraulic system releases pressure. The plunger, flange and upper mold plate descend by self-weight to realize mold opening.