Forklifts are highly efficient equipment for mechanized loading, unloading, stacking and short-distance transport. There are many types of forklifts. Among them, cross-country forklifts can travel on hills, mountains, beaches, sand, snow, ice and muddy roads. Off-road performance, suitable for loading, unloading, unloading and short-distance handling of field materials.
The core control part of the off-road forklift is electrical control and hydraulic control. Eaton Hydraulics has successfully implemented electro-hydraulic control for 1 ton off-road forklifts and verified the reliability of its performance. Take the hydraulic system of 1 ton off-road forklift as an example, its hydraulic system includes: hydrostatic drive travel brake system, full hydraulic steering system and hydraulic working system. Eaton offers all hydraulic systems.
Eaton Hydrostatic Drive System
Depending on the customer's model and structural design, wheel drive or front and rear axle drive is available. The Eaton design uses a four-wheel wheel drive with components such as the Eaton medium-load or heavy-duty series of closed pumps, such as the 72400 series. The electric proportional variable medium load piston pump and four parallel speed braked two-speed motors are connected, and the hydraulic motor is connected with the wheel travel mechanism to drive the wheel to rotate. When adjusting the inclination of the main variable pump swash plate, the flow rate of the output can be changed, so that the driving hydraulic motor can obtain different rotation speeds, thereby achieving stepless speed regulation performance. When the direction of the inclination of the main variable pump swashplate is changed, the direction of the oil flow can be changed so that the direction of rotation of the driving hydraulic motor is correspondingly changed, thereby realizing the forward and reverse of the vehicle. As shown in Figure 1, the charge pump 2 is used to replenish the system to supplement system leakage, provide flow to the cooling and filtration circuits, and provide control pressure to the system. The pressure of the charge pump is set by the charge safety valve 5, generally 1.2 to 2 MPa, and the flow rate is about 20% of the flow rate of the main pump. Under the action of the check valves 7, 8, the charge pump supplies oil to the low pressure side of the closed circuit. The shuttle valve 10 is connected to the normally open relief valve 9 under the high pressure control of the main oil passage. The pressure setting of the normally open relief valve 9 is always lower than the charge safety valve 5 by about 0.3 to 0.5 MPa, and the charge pump flow rate is much larger than the leakage amount of the system, so that the working oil in the main circuit can be continuously replaced for cooling. To control the oil temperature of the system. The system bidirectional high pressure safety valve 11 controls the safe working pressure of the system.
Eaton Full Hydraulic Steering System
The 1 ton off-road forklift uses a full hydraulic steering system and the rear wheel steering cylinder turns. The steering pump and the working pump are the same quantitative gear pump, and the Eaton 25 series gear pump can be cascaded on the 72400 travel pump. The steering gear is designed with Eaton XCEL45 series dynamic signal load-sensitive steering combiner priority valve to save installation space. The steering is precisely controlled by the steering wheel. Steering principle.
Eaton Hydraulic Work System
The forklift's working system controls the multi-way valve, which is equipped with Eaton's world-leading CML60 multi-way valve with electric proportional load-sensing control. It can be precisely controlled with the Eaton controller and handle. The multi-way valve's electric proportional control is a high-end configuration in small and medium-sized tonnage forklifts. The electric proportional scheme can use a multi-way valve, or a Vickers SICV valve combination can be used for differential design. The load-sensing electric proportional multi-way valve of this metering pump not only makes operation control easier and more accurate, but also has lower fuel consumption, energy saving and environmental protection.
Eaton Electric Control
The HFX controller and the heavy-duty multi-axis electronic controller form the electronic control part of the system. The controller is capable of directly driving various proportional and directional coils and is used in valves and pump systems to form a complete solution with a wide range of hydraulic components. The handle can be controlled in four directions and is equipped with a switch button for a variety of actions.
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