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Rail System Vacuum Pumps include all the features of EDCO USA vacuum grippers with a positive or limited purge. In addition, rail system vacuum pumps include a pilot-operated cartridge valve for vacuum on / off control. The modules mount to the side of a lightweight 1-1/2 in x 3 in rail profile. Air supply plumbing is completely eliminated by utilizing the rail as a manifold to distribute compressed air to each module.
- Simply System Zoning
- PP: Positive Pressure Purge
- LP: Limited Pressure Purge
- Cleaning Operation
- Rugged Shear Key Mount
Simple System ZoningOne of the most important features of our rail system vacuum pumps is the ease and ability of zoning. Zoning groups several modules to a pair of three-way solenoid pilot valves. One solenoid pilot valve controls the vacuum on and the second controls the positive pressure purge for each zone. Zones can include one to several modules and a system can have one to several zones. Systems should be configured with the smallest number of zones that provide the degree of control required for the application. If the requirements of the application change over time, the rail system assembly can easily be reconfigured by adjusting the number of modules per zone and or the number of zones per system.
Zones with the smallest number of rail system vacuum pumps provide the most system control. However, they also require the largest number of solenoid pilot valves. Systems with all modules controlled as a single zone are the simplest and require only two solenoid pilot valves. These systems are limited to basically on / off operation for all the modules. For picking and placing various sizes of cases onto a single mixed pallet load, use zones with a few modules. For picking and placing identical cases onto a single pallet load, use a single zone.
Positive Pressure PurgeAir pressure supplied to the venturi of a rail system vacuum pump is diverted to the vacuum port by blocking the venturi exhaust with a piston operated by a pilot pressure signal. Tool separation movement must begin immediately (no dwell) when the purge signal is initiated to prevent excessive positive pressure inside vacuum cups due to forces pressing the tool onto the work surface. Vacuum switches could not be used due to their limited over-pressure capability.
Limited Pressure PurgeRail system vacuum pumps using limited pressure purge are like those using positive pressure purge except for a modification that limits the pressure applied to the vacuum cup. Purge air flow is not as robust with the limited pressure purge option compared to the positive pressure purge option but the pressure is limited so a vacuum switch can be used for workpiece presence detection.
Cleaning OperationSome rail system vacuum pump assemblies may not require the quick-release provided by the purge options. For these systems, the purge pilot ports can be plugged and not used. However, it would be worthwhile to connect all the purge pilot ports to one pilot valve to provide a brief reverse-flow cleaning action to blow out any ingested debris from the vacuum cups every few cycles depending on the application environment. This brief cleaning operation won’t add to total cycle time and should be performed during the return-home period while vacuum cups are open to atmosphere.
Rugged Shear Key MountRail system vacuum pumps include a two-point mount with shear keys to eliminate the possibility of pumps shifting out of position during operation. Workloads are efficiently and directly transferred to the mounting profile. Mounting screws only carry tensile loads.
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