GOODS-PASSENGER LIFTS GPL
that have ever been invented *)
GPL® Goods-Passenger Lifts of loads from 900 to 12.500 kg and higher provide transportation of goods and accompanying persons. As a rule, the GPL-lifts of higher loads are adapted for loading / unloading by means of forklifts. The lifts are equipped with direct drives with two or four EC type pistons (telescopic with mechanical synchronization) or TCS (for narrow shafts) pistons. If it is necessary, the pawl devices are used additionally to stabilize the lift cabin’s floor during loading with forklifts.
It is best described by the shaft utilization coefficient:
that has the biggest value out of all standard goods-passenger lifts. The shaft walls are characterized by light construction because forces are concentrated mainly on the shaft bottom and do not require dilatation.
Important parameter - force on the cabin’s sill: FsGoods-passenger lifts must meet strict requirements because they work in severe conditions. They not only transport weighs of several tons, but the loading is carried out by means of such devices as pallet trucks or massive fork-lifts. The design of key structure elements should be strong enough to withstand forces and torques (Ts). Normally, the characteristics include such parameters as load capacity and dimensions of the cabin and doors. However, the usefulness of a lift to work hard determines the force on the cabin’s sill. In the case of load capacity equal or higher than 2500 kg, the lift standard recommends to take into the consideration the Fs force equal to:
Example: Q=3000 kg, minimum force on the sill Fs = 1800 KG.
Fs = 0,6 • Q
Example: Q=4000 kg, minimum force on the sill Fs = 3400 KG.
Fs = 0,85 • Q
The fulfillment of these conditions is not easy. It requires not only the direct drive 1:1, but also proper carframe design and cabin’s floor sills. Despite above requirements included in the lift standard, many manufacturers are not able to provide lifts with the right force values on the cabin’s sill. One should pay particular attention to it at the stage of selecting the right solution.
In many factories in the world, there are operating inappropriate goods-passenger lifts. Once they run for the first time, it turns out that they can be loaded only with small devices and despite the large cabins, they are often overloaded. Incorrect selection of right lifts in a factory usually reflects its lower efficiency.
*) A great advantage over other technical solutions – in particular over traction goods lifts:
GOODS-PASSENGER LIFTS LOADING/UNLOADING
The GPL® Goods-Passenger Lifts with the GMV 1:1 Technology are used in the buildings in which there is a need to transport heavy large-size goods and/or persons. The GMV lifts are the perfect solutions in multilevel store buildings and production plants. The GMV solutions integrate horizontal and vertical migrations of goods into one effective and very efficient internal logistic system.
The selection of a proper goods-passenger lift must be always preceded by a deep analysis of possibilities and needs of a future user. Store buildings and production plants do not function without forklifts and that is why the goods-passenger lifts of large-size cabins and high loads should be adapted for entering of such type loading equipment fully loaded. The lift is adapted to transport forklifts together with loaded goods. The lift operation frequency can be high: on average 10-20 travels/hour.
The lift is adapted to transport forklifts together with loaded goods. The lift operation frequency can be high: on average 10-20 travels/hour.
The minimum force on the cabin’s sill, by lift standard EN 81-2, equals Fs = 0,85·Q (for load Q ≥ 2500 kg).
The lift is loaded with one forklift truck and unloaded with a second one on another level. The lift operation frequency: moderate, on average 5-8 travels/hour.
The minimum force on the cabin’s sill Fs = 0,85·Q (for Q ≥ 2500 kg).
The alternating operation mode exists if the lift is not adapted to loading with forklifts (low maximum force on the cabin’s sill), but only with small palette trucks. Goods are delivered to the so called reloading zone from where they are next taken by workers who serve palette trucks to fill the floor in the lift cabin. It is not possible to place goods one on another and the real load equals to the sum of palette weights placed on the lift cabin floor. The lift operation frequency: low, on average 3-5 travels/hour.
In case of loading the cabin by means of palette trucks, the minimum force on the cabin’s sill equals Fs = 0,6·Q (for Q ≥ 2500 kg).
The alternating mode is of low effectiveness because almost always the real load is much lower than nominal one. This difference can reach even up to several tones. Note: there exists a high risk of attempts to load with forklifts the lifts which are not adapted to such loading. That is why GMV recommends for operation in the alternating mode the lifts with small-size cabin which cannot be entered by the forklifts.
The lift simple operation mode is applied in small production plants, workshops, warehouses or shops. Lack of forklift trucks causes that goods (as a rule of low weight) are manually reloaded into boxes and next transported with palette trucks. The goods-passenger lifts are of low loads (usually up to 1,6 t) and are not intensely used.
For loads less than 2500 kg the lift standard recommends force on the sill Fs = 0,4·Q.
GMV delivers the GPL® lifts that operate in all 4 modes. The great majority of competitive companies offer goods-passenger lifts that operate only in the alternating and simple modes (hydraulic goods-passenger 1:1 and 1:2 lifts and traction goods-passenger lifts including traction MRL ones).
Thanks to unique GMV 1:1 Technology GMV has been a leader in the GPL - lift solutions for many years.