Shovels Doosan: high performances with minimum consumptions
9 March 2012
With capacity to use ladles that go of 3 to 5,5 m3, the new loaders big of wheels Doosan are thought to satisfy a big variety of needs of handle of materials, from the load and transport of loose matters (like sand or gravel) until industrial applications, minería and quarries.
The wheel loaders DL300-3 and DL350-3 work with the engine diesel Scania DC09 of 5 cylinders and 9 litres with selective catalytic reduction (SCR) that surrenders a maximum power of 202 kW to 1800 rpm, whereas the models DL420-3, DL450-3 and DL550-3 come endowed of the engine diesel Scania DC13 of 6 cylinders and 13 litres with SCR that offers the ‘best ‘ in his class' regarding power and pair engine, with a maximum of 264, 264 and 283 kW to 1.800 rpm, respectively.
Lower consumption of fuel
Many of the characteristics of the big wheel loaders of the new generation have developed to optimise the consumption of fuel. The technology SCR reduces it around 10% regarding machines of size seemed with technology of recirculation of the gases of leakage (EGR). Also it improves the value of reventa because it is easy to go back to motors of phase II for his use in emergent markets.
The new loaders big of wheels have three ways of operation of the engine: ecological, normal and power, to adapt the machine to different applications, with diets of the engine and relations of the change that vary according to the active way. The operator can happen to the following way of work with only put the foot down the pedal of the accelerator. Like this, the operator can do the travel in the normal way and change to the of power when really it needs it (for example, when collecting material of a montón). All this results in a decrease of the consumption of fuel. It sweep it ECHO provides information in real time on the consumption of fuel regarding the performance of the machine, by what the operator can select the profile of driving adapted to achieve the optimum consumption.
Is possible to establish a password for the start of the machine. If it is activated the ralentí automatic, the diet of the engine goes down some 200 rpm after 10 seconds without that there is movement of the machine. The ralentí automatic is ideal in applications with long waits, as when loading trucks. His use reduces the consumption of fuel until 8%.
All the big wheel loaders Doosan of the new generation are instrumented with pumps of pistones hydraulics variables and controlled by detection of the load, that improve the performance and diminish the consumption. With the detection of the load, the hydraulics pumps receive a signal of the valve of main control that informs of the quantity of oil that needs . This contributes to save in performance of the engine.
When it is active the system of cutting of the embrague, the driver can accionar the pedal of brake for desconectar the transmission of the engine and that 100% of the performance of the engine go to the hydraulics system. In consequence, the movements speed up , the strength of start maximiza and the consumption of fuel reduces .
All the loaders big of wheels Doosan of the new generation come endowed of a system of cutting of the converter of pair (TCCO) that, if it is activated, connects automatically. This system provides a mechanical link between the engine and the transmission without loss of power neither of pair. The proofs show that, thanks to the increase of the traction, the consumption of fuel goes down until 10% regarding conventional systems. In comparison to the installed transmissions in other machines, the TCCO can accionarse even between second and fifth, no only in the longest course. This translates in the greater efficiency of the TCCO.
New transmission ZF of 5 speeds
The new transmission ZF of 5 speeds improves the transfer of power from the engine until the wheels and contributes significantly to the total decrease of the consumption of fuel. The change of four to five courses offers better answer and acceleration, especially in slopes. The variation of the diet of the engine is lower thanks to that the increases between courses are smaller, with the consequence that it diminishes the consumption of fuel in all the fan of use. Thanks to the greater quality of the change, the levels of noise are lower whereas they have improved the provision and the productivity. An embrague autoblocante also helps to diminish the consumption of fuel.
The new differential ZF of type II and slide limited offer a greater durability and an useful life longer. Also it has reduced the resistance to the rodadura of the axles, improving the traction and diminishing the consumption of fuel. The customers have of the option to choose axles ZF with hydraulics blockade of the differentials. This function active by means of a pedal or of automatic form depending on the resistance to the pair in first and in second speed. The system of hydraulics blockade contributes the advantage that it offers less resistance to the rodadura that the system of slide limited.
The fan of the radiador, of hydraulics operation, controls by means of an electronic switchboard. From the cabin can change manualmente the steering of the fan to clean the radiador without having to turn off the engine. The intervals of investment of the fan (between 30 minutes and 2 hours) can define by means of the menu.
Big comfort of the operator
A new design of the cabin incorporates improvements so much was —for example, better visibility with a section glazed wider in the frontal and a greater coverage of the limpiaparabrisas, better protection thanks to guardabarros bigger, designs improved in roast and ladders and a new ceiling—, as inside —for example, new board of instruments that integrates unit of control of the vehicle (VCU) —.
The signpost of control has rediseñado so that the operator can choose the information that wishes to see in the screen. The main menu allows the access to several functions and data of the machine. The pressesure, the temperature and the diet of the engine can see in real time. Also there are menus that offer information detailed on the operation.
The new wheel loaders will have seats Grammer endowed of vertical pneumatics suspension and horizontal. This design, that cushions the movements to in front and to backwards, has the recommendation of advisers in orthopaedics and a good acceptance between the operators.
The tank of the water lavaparabrisas has situated in the outside of the cabin, which has increased the available space inside, especially in the zone of the feet. The system of air conditioned has automatic regulation by means of a thermal sensors sensor.
To keep cool tins of beverages and food, includes of series a new compartment refrigerado. Likewise there is more space to save things behind the seat.
Durability and ease of service
All the loaders big of wheels Doosan of new generation include of series the system of lubricación automatic SKF Vogel. This system allows more hours of operation and expands the useful life of the machine.
The arm of elevation has reinforced with a thickness 10% elder in the arm and in the crowbar of inclination.
An automatic system of leading control allows that the operator store a low position and a high. The function of ‘desenganche to raise the feather' speeds up the cycles and increases the comfort of the operator. Also they can save positions to ‘go back to dig'.
A new cinematic and a bigger cylinder in the arm of elevation have allowed that the main pressesure increase in the hydraulics system forward between 40 and 70 bar, depending of the size of the machine, with an increase of until 5% in the strengths of start and of elevation.
A greater opening angle for the lateral door improves the ease of service. A fan that pivota 90° with lateral doors allows a comfortable access to the backside to clean the new radiador, formed by an alone block. The operator can establish and supervise the time that remains until the following review. If it surpasses the period of maintenance, will appear a message of warning. The increase of the space in the compartimiento of the engine guarantees that it was easy to access to components such like filters, valves and batteries for his maintenance.
