General Specifications
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Pflow Series 21 Vertical Lifts move materials between two levels. Principal components are guide columns, carriage and hydraulic actuating mechanism.
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Application Data
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Pflow Series 21 Vertical Lifts are available with: Lifting capacities to 8,000 lbs.; carriage sizes to 10' x 10'; vertical rise to 22'. Standard travel speed is 24 fpm. Speeds to 35 fpm are available on special order.
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Structure
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Guide columns are 6" wide flange. Carriage is fabricated
of 4" or 6" structural members with steel deck plate. Other dec surfaces can be supplied. Carriage is available in straddle or cantilever styles.
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Operation
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Carriage is lifted and lowered by two hydraulic cylinders mounted on guide columns. Cylinders are actuated by a remote mounted hydraulic pump. Transmission of the lifting force is through roller chain attached to the cylinders and carriage. A torsion bar links the two cylinders to equalize the load and ensure carriage remains level at all times.
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Electrical Arrangement
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Standard power requirements are 208V/230V/460V, 3-phase. Single-phase is an available option. Control voltage is 24V. Control stations and remote mounted control panel are NEMA 12. Control stations, provided for each level, include selfmaintaining push buttons with mushroom-head E-Stop button. Quick connect pre-wiring is available as an option.
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Safety Features
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Overtravel is prevented by positive mechanical stops. Safety cams prevent uncontrolled descent in case both chains break. Velocity fuses prevent uncontrolled descent in case of hydraulic hose rupture. NO RIDER signs are posted at each point of operation. Optional DeckLocks automatically lock carriage at the upper level to eliminate drift or bounce. Carriage will not move if loaded to more than 120% of rated capacity.
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Carriage Side Guards
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Carriage is equipped with safety rails on non-operating sides and safety chains or diagonal drop bars on operating ends. Optional expanded metal or sheet metal carriage side guards are available.
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Safety Enclosures
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Safety codes (ANSI/ASME B20.1) require gates and enclosures on all sides of the lift. Enclosures must be a minimum of 8' high and reject a ball 2" in diameter. Pflow manufactures gates and enclosures with 1/2" expanded metal in a structural angle frame. Gates are accessible during loading/unloading and are electrically and mechanically interlocked with carriage movement. Interlocks prevent gates from being opened unless the carriage is at the designated level and also prevent carriage movement if any gates are not fully closed and locked.
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