The lift table shown above is not only used in 3-shift operation, but must also be able to withstand 60 strokes per hour during operation. Here we would like to show you how we have prepared the scissor lift table for this high load.
Designed for highest loads
It makes a huge difference for a scissor lift table whether it is only operated once or twice an hour or whether, like this lift, it is constantly in motion.
The number of double strokes to be completed per hour influences everything: from the choice of the power unit to the actual mechanical structure.
Choice of hydraulic power unit
Lift tables are usually only moved sporadically. Therefore, the use of under-oil units is recommended. Compared to compact units, they have a more pleasant background noise level and can usually be installed inside the lift table to save space.
The short duty cycle is a disadvantage, though. Because the electric motor is situated directly in the oil, it heats up the oil as the operating time increases. If an under-oil unit still needs to be used, either the oil quantity must be increased or an oil cooler must be provided.
In this case we decided to use a compact power unit. As the customer wanted the unit to be installed externally, the larger dimensions were not important. The fact that the electric motor of a compact power unit is cooled by the surrounding air makes a duty cycle of up to one hundred per cent possible.
All our lift tables and column lifts are mechanically very robust. In our opinion, cost-saving in this area cannot be achieved without a considerable loss of quality. And as a lift table manufacturer we want to be proud of each of our products. For this reason, you will not get fully maxed out scissor lifts from us, but only robust workhorses.
However, if a lift table is used in continuous operation, our sturdy structure must also be supplemented with extras.
- Exchangeable slide rails
With a lift table that performs almost 1,500 strokes a day, sooner or later the running surfaces of the non-locating bearing rollers will wear out. The running surfaces are bolted on to allow their quick removal to eliminate the wear.
This means that if there is too much wear and tear, the old running surfaces are unscrewed and new ones are bolted on again. This means that the lift table is ready for use again in the shortest possible time.
- Surface-hardened non-locating bearing rollers
But just like the running surfaces, the non-locating bearing rollers are also subject to wear. For this reason, our standard non-locating bearing rollers are already manufactured from a very wear-resistant steel grade.
The rollers in the example shown underwent additional hardening for even better stability.
- Greasable bearings
It should come as no surprise that all of the bearing points on this lift table can be lubricated. This means that the highly stressed bearings can be regreased regularly, which increases the durability of the various components considerably.
Use without foot protection safety edge
If you take a close look at the illustration of the lift table, you will notice that it does not have the usual foot protection safety edge. The safety edge may only be omitted if one of the following two conditions is met:
- The lift table is driven manually.
- The lift table is safe due to the installation situation.
In the present case, the second condition is met. The lift table forms part of an automated production line. It is also integrated into the control system and safety circuit of the higher-level system. If an employee enters the danger zone, the entire plant is automatically shut down, so that there is no risk of crushing.