The Atlantic Freight Platform Lift is a holeless design with side mounted hydraulic cylinder(s). Unlike conventional hydraulic systems, this design does not seep oil, making it one of the most environmentally friendly systems available. Platform Lifts are governed by CAN/CSA B44-94, allowing for penetration of one floor. Maximum allowable lift speed is .15m/sec. (30 ft./min.)
The power unit and controller are located in a machine room that is adjacent to the hoistway.
Structure
The platform is a welded structural steel assembly with a non-skid checker plate surface. The wall panels are constructed of sheet metal on a structural tube frame and are a minimum of 2 metres high. The platform assembly is guided by high tensile "I" beam vertical guide rails by means of four inch, high speed, sealed bearings attached to the top and bottom of the platform. This design provides for the highest stability and least distortion available in the industry today, providing a safe and durable system for both front and side loading. Safety maintenance pins are provided that when put in place, will safely support the platform during maintenance or service. Atlantic's in-house welding shop and field service team are CWB approved to CSA W47.1.1992 and W59.
Hydraulic System
The pumping unit is comprised of a direct coupled motor and fully submerged pump, oil reservoir, suction and filler strainers, solenoid operated lowering valve, pressure gauge with isolating valve, pressure relief valve, manual shut-off valve, pressure compensated flow control valve and a manual lowering by-pass valve to allow lowering of the platform in the event of a power failure. Our fully adjustable hydraulic control valve provides for soft starts and stops in both directions.
This leak proof system is above ground and does not endanger surrounding soil with contamination. The hydraulic cylinder(s) is a single action, single speed, piston seal or displacement type with seamless tube, micro-honed cylinder walls and chrome finish piston rods. The cylinder(s) is equipped with a safety velocity fuse at the pressure port to stop downward motion of the platform in the event of a hydraulic supply line failure. Synchronized telescopic cylinder(s) is available for low overhead applications.
The Electrical Control System
The control panel is comprised of two main line contactors in line with thermal overload motor protection, a transformer to reduce the primary control voltage to 120 volts for operator safety and a fused secondary circuit of industrial relays.
The up and down push button controls are of the constant pressure (CPPB) type that, when depressed, will raise or lower the lift until released or the selected landing is reached. The controls and equipment may be protected against unauthorized use by keyed switches. The control station(s) is provided with an emergency stop button which when depressed, renders all stations inoperable.
An anti-creep levelling device is provided to maintain floor level. No controls except the emergency stop will over-ride a control device in operation. Controls on the platform have priority and render the landing controls inoperative while the push buttons are depressed and, for a timed period when they are released to allow personnel to exit the platform. Other than the anti-creep levelling device, all controls are switched off when any door is open. The doors are mechanically locked when the platform is not at the landings.
The failure of any single magnetically operated switch, contactor, or relay to release in the intended manner shall not prevent the platform from stopping in response to terminal stopping devices. A pit switch is provided that when activated removes power from the system for safety during service and maintenance.