STOPPER ROD SYSTEM
(Modernization of existing casting plants)
The device described here is the Progelta Stopper Rod System. It is designed to start, stop and control the flow of iron being poured. The operation is designed to be completely automatic. The stopper rod holder is made of stainless steel, a material suitable to withstand liquid iron.
The Stopper Rod Drive Assembly comprises a motor that causes the vertical movement on a ball screw.
The electric motor is of the brushless type. This type of motor permits a dynamic response and gives control over the position of the stopper with promptness and precision to about 0,1mm.
The Stopper Rod Drive Assembly can be rotated on its support axis (except in cases where there are constraints caused by connection cables), simply by lifting the rod to the upper stroke limit so that the rotation guide bar is raised above the upper brass (1), making the rotation possible (2).
All moving parts and the stopper rod guide are protected by a cylindrical casing; one part to protect the motor compartment, and the other part to protect the sliding guide.
This casing can be easily opened and removed for normal maintenance operations.
The motor is connected to the control unit with two cables and connectors. One connection is to the power supply, and the other is to the encoding transducer that measures the opening of the stopper.
In addition, a device is installed inside the housing that detects the temperature at the motor and if necessary will activate the cooling system. The temperature is monitored at the supervision computer and an alarm is generated should the temperature exceed a given level.
The cooling system is via two Vortex coolers (air conditioning devices working with compressed air). Fan coolers can be installed on request and depending on operating conditions.