Hydraulic Clamp Safety System Enhancement

This Safety Retrofit is for all Uniloy Milacron and Liberty Reciprocating Screw Blow Molding Machines.

The hydraulic clamp safety system features a spool-monitored cartridge valve with its own independent Siemens Controller. This hydraulic valve is installed on the working side between the directional valve and the clamp actuator. The blocking spool is monitored for correct positioning when the safety gate is opened and closed. Should the spool not move to the “blocked position” when the safety gate is opened, an electrical signal is sent to the control outputs and shuts off the hydraulic pump motor preventing further clamp movement. This condition will present an alarm indication and will not permit restarting of the hydraulic pump until the hydraulic clamp safety valve is functioning properly.

This enhancement is being offered in response to the revised ANSI standard, ANSI/SPI B151.15—2000; Safety Requirements for the Construction, Care and Use of Extrusion Blow Molding Machines. The intent of this standard is for you to block the working oil in the clamp circuit with a spool-monitored valve within 3 years of the approval date— September 29, 2000. For a copy of this Standard, contact the American National Standards Institute (ANSI) at 212-642-4900 or on the Web at http://www.ansi.org

The following list includes most of our common machines and the hydraulic safety valve originally supplied. Please note that none of these systems monitor the spool position:

Includes:

• Rexroth Cartridge Valve with Spool Position Monitor
• Siemens Controller with Software
• Enclosure with Sub-Plate and Legend Plate
• Mounting Flanges, Wire Duct, Fittings, Hose and Terminal Blocks
• Circuit Breaker, Relays, and Red Pushbutton
• Hydraulic and Electrical Schematics, Partial Assembly at Uniloy