Chinese aerial lift manufacturer Dingli has announced five new self-propelled vertical lifts that use electric powered screw type actuators in place of hydraulic cylinders, thus completely eliminating the hydraulic systems.
Having launched all-electric versions of all of its boom and scissor lift range, Dingli has started introducing models which eliminate the hydraulic systems all together, with the unveiling of five new micro scissor and mast type lifts, which join the recently launched OPT0507 all electric stock picking platform.
Offering working heights of between five and eight metres, the five new models are:
The 19ft JCPT0807PA with an overall length of 1.86 metres, an overall width of 760mm and a maximum platform capacity of 230kg. Working height is 7.8 metres.
The 18ft JCPT0708PA is shorter at 1.52 metres, has an overall width of 810mm and a platform capacity of 230kg with a working height of 7.6 metres.
The 12ft JCPT0607PA has an overall length of 1.44 metres, an overall width of 760mm a working height of 5.6 metres and a platform capacity of 240kg.
The 11.5ft JCPT0507PA is just 1.16 metres long, with an overall width of 770mm a working height of just over five metres and platform capacity of 230kg.
And finally, the 16ft JCPT0807PA mast type lift which weighs just 990kg and offers a working height of 6.7 metres with a capacity of 200kg.
Dingli said: “Recently, with the world's first Oil-Free and all-electric AWP series, Dingli has officially entered the era of ‘No Hydraulic Oil’! The first batch of these six models is being mass produced.”
“The series use electric actuators for lifting, lowering and steering instead of traditional hydraulic oil cylinders, the advantages include lower energy consumption, safer, higher levels of water and dust resistance, built-in position sensors and real time data monitoring of the full stroke.”
“Easy maintenance, with no hydraulic system, avoiding system problems such as a stuck valve core, oil leakage, oil changes, high and low temperature efficiency reduction. Combined with maintenance-free permanent magnet synchronous motors and AGM batteries, all of which greatly reduces maintenance costs.”
“A more comfortable, full stroke proportional control eliminates the jitter and abrupt feeling caused by self-gravity lowering of the hydraulic system, providing a better experience. In addition, the new models are more environmentally friendly, with lower noise levels than with a hydraulic system.”
It seems that the move to zero hydraulic machines is gathering pace, with several new models announced in the past year or so, including JLG’s 19ft DaVinci AE1932. The concept of screw actuators to raise a scissor stack, dates back to UpRight’s first flying Carpets in the early 1970s which featured hydraulically driven screw lift mechanisms which failed dreadfully in the field and were quickly replaced with hydraulic cylinders. Then in 1996 a small group in Pennsylvania launched the all-electric Zefer Lift scissor lift range - totally free of hydraulics which they patented - which used electric drive and electric screw actuators. Some were sold but the market was not ready for it.
The secret of success comes down to price, reliability and ruggedness of the electric screw type actuators. The technology does appear to have reached a ‘state of the art’ phase, at least for smaller electric scissor and vertical mast lifts. However larger scissor and booms may be some time off yet although Spanish manufacturer Mecaplus is testing an articulated boom lift with electric lift cylinders See: All-electric self-levelling boom.
With more companies now offering machines with electric lift cylinders we can expect the cost and refinement of the components for the application to improve rapidly over the next year or two. How rapidly the industry as a whole makes the change will depend on how that process pans out.