What aspects need to be considered when choosing an electric stacker

What aspects need to be considered when choosing an electric stacker

1. Body aspect:
The car body is the main structure of the forklift. It is generally made of steel plates with a thickness of more than 5mm. It is characterized by no girder, high body strength, and enhanced load-bearing capacity. As far as the placement of the battery on the forklift body is concerned, there are two different manufacturing techniques, that is, the battery is installed between the front and rear bodies or on the rear axle. These two technologies represent two optimal options for forklift design, and each has its own advantages and disadvantages. The stability is good, but the available space in the vehicle body is small, so the capacity of the battery is limited, which is not more than 3T. Forklifts are not outstanding, but for those large-tonnage forklifts with complex operating conditions and continuous operation time up to 8 hours, the battery capacity requirements are high. Use a large-capacity battery to prolong the continuous working time of the electric stacker, thereby expanding the application range of the electric stacker. In the second situation, when the battery is placed on the rear axle of the forklift, the center of gravity of the forklift increases, and the stability of the whole machine is affected. Because the height of the forklift increases, the driver's seat increases, so the driver has a wider field of vision when operating, especially It is more applicable when handling bulky goods. When the battery is placed on the rear axle, the repair of the motor and hydraulic pump is more convenient, because after removing the battery and pedals, the motor and hydraulic pump can be seen at a glance. At present, most of the electric stackers produced by domestic enterprises use the second technology, while foreign enterprises have both situations. 2. In terms of gantry: At present, most electric stackers at home and abroad have adopted wide-view gantry, and the lifting hydraulic cylinder has been placed on both sides instead of the center. There are two orientations for hydraulic cylinders: one is that the hydraulic cylinder is located behind the mast, such as haulke's electric stacker; the other is that the hydraulic cylinder is located outside the mast, and the hydraulic cylinder of the forklift is located behind the mast. Masts are generally divided into standard type, two-section type or three-section type. The lifting height of domestic forklifts is generally between 2 and 5m, and most of them are 3m and below 3m, while the lifting height of foreign electric stackers is generally between 2 and 6m, because the warehouse is highly three-dimensional, so With a lifting height of more than 3m, the demand for electric stackers is much higher than that in China.

3. Drive aspects:
The drive system is one of the key components of the electric stacker. There are great differences in the structure of the drive system of various forklifts, and there are also differences in the placement of single motors. For example, some domestic forklifts have a T-shaped structure for the motor shaft and drive axle, while the drive motor shafts of foreign TOYOTA and other forklifts are But it is placed with the driving axle, and the structure is compact. The front wheel drive of LINDE's E20 electric stacker and CARER's P50 forklift is completed by two independent motors, which are placed parallel to the drive shaft and have a compact structure. Because it is driven by dual motors, the acceleration and climbing performance is good, and the traction force is large. The electronic full-speed system is used to replace the original mechanical differential system, and the applicability has been greatly improved. Fourth, hydraulic pressure:
Electric stackers generally use a separate motor to drive the gear pump, and then provide hydraulic power for the lifting and tilting of the mast operating system. At present, domestic forklifts, because the speed regulation of the hydraulic motor has not been completed, the hydraulic motor can only roll at high speed after starting, and will not automatically adjust with the change of function and pressure. The excess flow can only flow back to the fuel tank through the overflow valve, causing Energy wasted. New foreign forklifts, such as LINDE's E20 electric stacker, use advanced hydraulic pulse control technology. The hydraulic pump pulse controller can automatically balance the motor speed and oil consumption according to the response of the hydraulic circuit, thereby saving electric energy. The advantages are high power utilization, no voltage peak, low noise of the hydraulic system, and low wear of hydraulic components, which greatly improves the reliability and service life of the vehicle. 5. Braking aspects:
General electric stackers mainly use mechanical parking brakes and hydraulic service brakes. The hand brake is used for parking, and the foot brake is used for driving. The electric stacker adopts a hydraulic braking system. Expansion brakes are controlled externally and use power-assisted braking (the same type of power as the power steering system). The use of SCR and MOS tubes makes it possible to regenerate the braking energy of battery forklifts. The energy regeneration process is also an electronic braking process. Electronic braking occurs in the following three situations: (1) when the accelerator pedal is released (2) when the reverse accelerator pedal is pressed (3) when the hydraulic brake is applied When the first step of the pedal. Regarding LINDE's E20 and CARER's P50 electric stacker, when the brake is first or quietly stepped on, the traction motor will become a generator, and the electric energy will be sent back to the battery instead of wasting energy when braking like a general forklift wasted. It is only with further braking that the hydraulic brakes really come into play. The advantage of this braking system is that it prolongs the working time after each charge, reduces the wear of the braking system and transmission components, and also reduces the downtime for maintenance.